Patent Application
20180058127
The present invention relates to a vehicle window glass raising/lowering device, a vehicle door, and a vehicle.
In recent years, vehicle window glass raising/lowering devices for automatically raising or lowing window glasses are mounted on vehicles so that windows can be easily opened or closed.
Vehicles doors have a storage portion for housing a retracted window glass and a frame portion provided above the storage portion, and vehicle window glass raising/lowering devices are provided with a drive mechanism for moving a window glass vertically relative to the frame portion and a control unit for controlling the drive mechanism.
Since the window glasses are electrically raised or lowered, the vehicle window glass raising/lowering devices are generally provided with a mechanism to prevent pinching by window glass.
It is known that one of such mechanism is configured to monitor variation in rotational speed of a motor which drives a window glass, to determine that a foreign object is pinched by the window glass when a load increases and the rotational speed of the motor is reduced during raising the window glass, and to perform various safety operations such as automatic lowering of window glass by reversing its movement direction.
In such a mechanism, however, the safety operations are performed after a foreign object (part of human body, etc.) is actually caught. Therefore, a load is inevitably applied to human body and this causes a safety problem. For example, in case of a vehicle having window glasses of which upper edges are inclined obliquely downward at end portions in the front-back direction of the vehicle, and when a foreign object such as finger enters a wedge-shaped space between the window glass and the frame portion during when the window glass is moving up, a large load may be applied to a part of human body, etc., even when the safety operation is performed. Furthermore, in this mechanism, since a region of, e.g., 4 mm from the closing end for the window glass is often configured as an insensitive zone so that full closing of the window glass is not incorrectly detected as occurrence of pinching, the safety operation may not be performed when, e.g., a finger of a young child is trapped, hence, improvement is desired.
The vehicle window glass raising/lowering device disclosed in PTL 1 solved such problems.
In PTL 1, it is described that a camera is located on the vehicle interior side with respect to the window glass as well as on the lower-front side of the vehicle with respect to the window glass, a foreign object to be possibly pinched by the window glass is detected based on an image captured by the camera, and various safety operations such as automatic lowering of window glass is performed.
In PTL 1, it is also described that a marking applied around a window frame or an edge of the outline of the window frame, etc., is used as a feature amount for foreign object determination, and various safety operations are performed when a foreign object is present between the markers, etc., used as a feature amount and the camera.
The detection of the foreign object to be possibly pinched by the window glass based on the image captured by the camera as described in PTL 1 allows a safety operation to be performed before the object is pinched, and safety is thereby further improved.
PTL 1: JP 2007/186915
In the meantime, in, e.g., a vehicle having a thin door trim such as a compact car which is classed as a small size vehicle, a part of the passenger's body is located close to the window glass, i.e., located between the camera and the marker, etc., even in normal use depending on the position of the seat or the physical size of the passenger, and this causes a safety operation such as automatic lowering of window glass or halt of window glass movement to be performed during raising the window glass even though there is actually no possibility of getting pinched by the window glass. There is also a case where the window glass cannot be raised or lowered even though the raising/lowering operation is intended. In such a case, it is not possible to close or move the window even when a user wants to close or move the window in normal use, causing inconvenience.
To improve convenience, the camera and the marker, etc., could be provided very close to the window glass. In this case, however, a foreign object cannot be detected unless the foreign object advances very close to the window glass. Therefore, the safety operation performed after detection of the foreign object may be too late, resulting in that the foreign object gets pinched by the window glass and safety decreases. Particularly in a vehicle with a small door trim width or small sash width, the position of the camera or marker, etc., is close to the window glass and sufficient safety may not be ensured.
It is an object of an embodiment of the invention to provide a vehicle window glass raising/lowering device that makes it possible to improve convenience while maintaining safety, a vehicle door, and a vehicle.
According to one embodiment of the invention, a vehicle window glass raising/lowering device comprises: a drive mechanism arranged on a vehicle door to vertically move a window glass; a control unit for controlling the drive mechanism; and a camera for capturing an image of a detection line provided on the vehicle interior side with respect to the window glass, the detection line being along at least a part of the outer edge of the window glass in a state that the door and the window glass are closed,
The above embodiment of the invention is configured such that “a minimum distance in a vehicle width direction between a detection surface and an inner surface of the window glass at a lower edge of the detection surface is smaller than a minimum distance in the vehicle width direction between the detection surface and the inner surface of the window glass at an upper edge of the detection surface”. In this configuration, since the distance between the window glass and the detection surface is large in an upper region in which pinching by the window glass is likely to occur, it is possible to perform a pinch prevention operation before a foreign object makes contact. Meanwhile, since the distance between the window glass and the detection surface is small in a lower region in which a part of passenger's body, etc., is likely to come close to the window glass in normal use, it is possible to prevent such a problem that the pinch prevention operation is performed despite no risk of getting pinched by the window glass, hence, convenience is improved. As a result, both safety and convenience can be achieved even in, e.g., vehicles with thin door trim, such as compact car classed as a small size vehicle.
According to another embodiment of the invention, a vehicle door comprises: a storage portion for housing a window glass; a window glass that moves vertically; a drive mechanism that vertically moves the window glass; a control unit for controlling the drive mechanism; and a camera for capturing an image of a detection line provided on the vehicle interior side with respect to the window glass, the detection line being along at least a part of the outer edge of the window glass in a state that the door and the window glass are closed,
According to another embodiment of the invention, a vehicle comprises the vehicle door described above.
According to an embodiment of the invention, it is possible to provide a vehicle window glass raising/lowering device that makes it possible to improve convenience while maintaining safety, a vehicle door, and a vehicle.
An embodiment of the invention will be described below in reference to the drawings
As shown in
The frame portion 22 is composed of a rear upright portion 22a extending upwards from an end of the storage portion 21 on the rear side in the front-back direction of the vehicle, a front upright portion 22b extending upwards from the storage portion 21 on the front side with respect to the rear upright portion 22a, and an upper extended portion 22c extending from the top end of the rear upright portion 22a to the top end of the front upright portion 22b.
When the window glass 3 is fully closed, the window glass 3 is positioned in a space surrounded by the frame portion 22 and the upper edge portion of the door trim 23. That is, a window frame 25 is composed of the frame portion 22 and the upper edge portion of the door trim 23.
The vehicle window glass raising/lowering device 1 is provided with a drive mechanism 4 for driving the window glass 3 and a control unit 5 for controlling the drive mechanism 4.
The drive mechanism 4 is to move the window glass 3 vertically relative to the window frame 25, and is provided with a motor 41 such as DC motor and a power conversion mechanism 42 for converting a drive force of the motor 41 into power to vertically move the window glass 3. The power conversion mechanism 42 which can be used here is, e.g., a window regulator which is provided with a carrier plate supporting the window glass 3 and slidably moving along a guide rail and is configured to slidably move a wire along the guide rail by a drive force of the motor 41 and thereby to vertically move the carrier plate attached to the wire and the window glass 3 along the guide rail. An X-Arm type or another type of regulator can be also used as the power conversion mechanism 42.
A switch (SW) 24 is provided on the door 2 to open/close the window glass 3. An output signal line of the switch 24 is connected to the control unit 5. The switch 24 is constructed from, e.g., a two-stage click-type rocker switch which is configured to output a signal to the control unit 5, such that a first-level move-down click signal is output when an end on the move-down side is clicked to the first level, a second-level move-down click signal is output when the end on the move-down side is clicked to the second level, a first-level move-up click signal is output when the other end on the move-up side is clicked to the first level, and a second-level move-up click signal is output when the other end on the move-up side is clicked to the second level.
The control unit 5 controls the drive mechanism 4 according to the signal from the switch 24 to vertically move the window glass 3. The control unit 5, as a control unit constructed by appropriately combining CPU, memory, interface and software, etc., is mounted on the door 2. Other than on the door 2, the control unit 5 may alternatively be mounted as a part of, e.g., an electronic control unit (ECU) which controls mirrors or seats of the vehicle.
The control unit 5 is configured to control the drive mechanism 4 such that when a first-level move-down click signal is input from the switch 24, the window glass 3 is lowered during when the signal is being input, and when a second-level move-down click signal is input, the window glass 3 continues to move down until the window glass 3 reaches the bottom or the switch 24 is operated again. Also, the control unit 5 controls the drive mechanism 4 such that when a first-level move-up click signal is input from the switch 24, the window glass 3 is raised during when the signal is being input, and when a second-level move-up click signal is input, the window glass 3 continues to move up until the window glass 3 reaches the top or the switch 24 is operated again.
Next, a configuration to prevent pinching by the window glass 3 will be described.
The vehicle window glass raising/lowering device 1 is provided with a camera 7 which captures an image of a detection line 6. The detection line 6 is provided on the vehicle interior side with respect to the window glass 3 and is at least partially along the outer edge of the window glass 3 in a state that the door 2 and the window glass 3 are closed. In the present embodiment, whether or not a foreign object to be possibly pinched by the window glass 3 is present is judged based on an image captured by the camera 7. A specific configuration and installed position of the camera 7 will be described later.
The detection line 6 is a reference line for judging presence/absence of a foreign object to be possibly pinched by the window glass 3, and is provided on the vehicle interior side with respect to the window glass 3. A specific configuration and setting position of the detection line 6 will be described later.
In the present embodiment, light sources 8 emitting infrared radiation toward the detection line 6 are also provided. The camera 7 is constructed from an infrared camera which captures the infrared radiation emitted from the light sources 8 and reflected by the detection line 6. Since the light sources 8 are provided, a foreign object to be possibly pinched can be detected also during the night, or in a dark place even in a daytime where infrared radiation does not reach, e.g., in an underground parking, etc. A light source which emits near infrared radiation can be used as the light source 8.
The control unit 5 has a detection unit 51 and a pinching prevention unit 52. The detection unit 51, which is one aspect of the detection means of the invention, detects a blocked state in which the detection line 6 captured by the camera 7 is at least partially blocked by a foreign object. The pinching prevention unit 52, which is one aspect of the pinching prevention means of the invention, causes the drive mechanism 4 to perform a pinch prevention operation for preventing pinching by the window glass 3 when the blocked state is detected by the detection unit 51 during when the window glass 3 is moved by the drive mechanism 4.
The detection unit 51 is provided with an image processing section 51a which processes an image captured by the camera 7 and extracts the detection line 6, and a blocked state determination section 51b which determines, based on the image processed by the image processing section 51a, whether or not it is the blocked state in which the detection line 6 is at least partially blocked by a foreign object.
A specific method of extracting the detection line 6 by the image processing section 51a is not specifically limited. For example, when an unnecessary portion is removed by trimming the image captured by the camera 7 and posterization process, binarization process or edge detection process is performed, the detection line 6 with brightness different from surrounding members can be extracted.
The blocked state determination section 51b is configured such that, for example, an image in a non-blocked state (which is an image after being processed by the image processing section 51a) is preliminarily stored as an initial state image, and whether or not the detection line 6 is blocked by an foreign object is determined by comparing the initial state image to an image output from the image processing section 51a. The blocked state determination section 51b is configured to, e.g., compare the initial state image to an image output from the image processing section 51a and to determine it is the blocked state when a difference of the edge of the extracted detection line 6 or a difference of the area of the detection line 6 exceeds a preset foreign object determination threshold.
The pinching prevention unit 52 causes the drive mechanism 4 to perform a pinch prevention operation for preventing pinching by the window glass 3 when the blocked state is detected by the detection unit 51 during when the window glass 3 is moved by the drive mechanism 4. The pinch prevention operation includes an operation of stopping movement of the window glass 3, an operation of lowing the window glass 3 to a safe position, an operation of warning an operator by sound or light from an alarm device installed inside the vehicle, and a combination thereof.
The control unit 5 is further provided with a command cancellation unit 53 which cancels a command from the switch 24 when the blocked state is detected by the detection unit 51 after a command to move the window glass 3 is issued from the switch 24 but before the window glass 3 starts to move. Since the command cancellation unit 53 is provided, the window glass 3 does not move during when the blocked state is detected, and safety is thus further improved. The command cancellation unit 53 is one aspect of the command cancellation means of the invention.
Next, specific configurations, etc., of the camera 7 and the detection line 6 will be described.
As shown in FIGS.2 to 4B, in the vehicle window glass raising/lowering device 1 of the present embodiment, the camera 7 has an optical system 71 including at least one lens and an image pickup device 72 onto which a subject image is focused by the optical system 71, and the optical system 71 is arranged at a position corresponding to an opening 23a formed on an upper surface S of the door trim 23 so that an optical axis C of the optical system 71 passes through the opening 23a.
In other words, in the present embodiment, the camera 7 is provided on the upper surface S of the door trim 23. The upper surface S of the door trim 23 here is an outer surface of the door trim 23 at a top edge portion and is a surface which is visible from above in a vertical direction. The upper surface S of the door trim 23 may be inclined with respect to the vehicle width direction (horizontal direction). The door trim 23 is generally curved such that the upper surface S has the highest portion in the vicinity of the window glass 3, i.e., in the vicinity of an exit slot 21a allowing the window glass 3 to come out from the storage portion 21, and slopes down as a distance from the window glass 3 increases. Thus, the upper surface S of the door trim 23 is an outer surface of the door trim 23 (a portion corresponding to a lower surface of the window frame 25) in the vicinity of the window glass 3 (the exit slot 21a).
The opening 23a is formed on the vehicle interior side with respect to the exit slot 21a, and the optical system 71 of the camera 7 is arranged so that the optical axis C is located on the vehicle interior side with respect to the exit slot 21a. Although the camera 7 in this example is arranged so that the optical axis C of the optical system 71 coincides with the vertical direction when viewed in the cross section in
In the present embodiment, the camera 7 is arranged in a hole 23b provided on the upper surface S of the door trim 23 at the center in the front-back direction of the vehicle (at the center of the upper surface S of the door trim 23 on a side facing the window glass 3). However, the position of providing the camera 7 is not limited thereto and may be shifted toward the front or rear of the vehicle.
The camera 7 has a columnar shape as a whole and has a flange 73 which is formed at a top end so as to protrude radially outward. The camera 7 is inserted into the hole 23b from above the door trim 23 and is fixed to the door trim 23 by arranging the flange 73 so as to be housed in a recess 23c formed at a circumferential edge of the hole 23b and engaging a locking pawl 23d, which is provided at a lower circumferential edge of the hole 23b, with a groove (not shown) provided on the camera 7. Although the top end face of the camera 7 is flush with the upper surface S of the door trim 23 in this example, the top end face of the camera 7 may protrude upward from the upper surface S of the door trim 23 or may be located below the upper surface S of the door trim 23. In addition, although the camera 7 in this example is arranged so that a portion of the optical system 71 is located above the opening 23a, the camera 7 may be arranged so that the optical system 71 is located below the opening 23a. In addition, the structure for fixing the camera 7 to the door trim 23 and the direction to insert the camera 7 are not specifically limited and can be appropriately changed.
The camera 7 is desirably configured to capture an image of the detection line 6 which extends along at least an upper rim portion of the window glass 3, which is a portion of an outer rim of the window glass 3 and the closing end for the window glass 3, in the state that the door 2 and the window glass 3 are closed. In other words, the camera 7 is desirably configured to capture an imagen of the detection line 6 which is continuously provided on the frame portion 22 so as to extend along at least a portion of the rear upright portion 22a, the entire upper extended portion 22c and at least a portion of the front upright portion 22b. This is because pinching between the window glass 3 and the window frame 25 is most likely to occur at the closing end for the window glass 3, i.e., at the upper extended portion 22c, and also at the top ends of the rear upright portion 22a and the front upright portion 22b.
Furthermore, the camera 7 is desirably configured so that the imaging range (a viewing angle) thereof covers the entire moving area of the window glass 3. In detail, in case that the window glass 3 is configured to be completely retracted, the viewing angle of the camera 7 desirably covers the range from the vertically upper portion to the lower end of the rear upright portion 22a on the rear side of the vehicle and from the vertically upper portion to the lower end of the front upright portion 22b on the front end of the vehicle. Meanwhile, in case that the window glass 3 is configured to not be completely retracted, the viewing angle of the camera 7 desirably covers the range from the vertically upper portion to an intersection formed between the rear upright portion 22a and the upper edge (upper rim) of the window glass 3 which is located at the lowest position, and the range on the front side of the vehicle from the vertically upper portion to an intersection formed between the front upright portion 22b and the upper edge (upper rim) of the window glass 3 which is located at the lowest position. An example of an image captured by the camera 7 (an image after trimming) is shown in
Although the imaging range (the viewing angle) of the camera 7 set to cover the entire moving area of the window glass 3 has been described in this example, it is not limited thereto if this causes inconvenience. That is, the imaging range (the detection region) may be set to exclude a region in which a part of human body, etc., is likely to be located between the camera 7 and the detection line 6 in the normal use and inconvenience is caused. The details will be described later.
It is desirable to use a wide-angle lens as the optical system 71 of the camera 7 so that a foreign object can be detected in the range described above. The optical system 71 used in this example is formed by combining plural ultra wide-angle lenses so as to have a viewing range of not less than 180°, or 190° taking into account the installation precision, in the front-back direction of the vehicle.
Meanwhile, to quickly detect the foreign object, the frame rate of the image pickup device 72 used is desirably as high as possible. In the present embodiment, a CMOS (Complementary MOS) image sensor is used as the image pickup device 72.
The detection line 6 is provided along the frame portion 22 on the vehicle interior side with respect to the window glass 3. To cover the region in which pinching by the window glass 3 is likely to occur, the detection line 6 is desirably provided along at least an edge of an upper portion of the window frame 25 which is a closing end for the window glass 3. That is, the detection line 6 is desirably provided continuously along at least a portion of the rear upright portion 22a, the entire upper extended portion 22c and at least a portion of the front upright portion 22b. In the present embodiment, the detection line 6 is provided along the entire frame portion 22 on the vehicle interior side at a distance from the window glass 3.
The detection line 6 may be provided on either the door 2 or the vehicle body as long as it is provided along the window frame 25. For example, in a vehicle in which a distance d4 between the window glass 3 and an edge (an end face) of the frame portion 22 on the vehicle interior side (see
In the present embodiment, the detection line 6 provided on the door 2 is described as an example. In this case, the detection line 2 is provided on the inner circumferential surface of the entire frame portion 22, i.e., the inner surfaces of all the rear upright portion 22a, the front upright portion 22b and the upper extended portion 22c, on the vehicle interior side at a distance from the window glass 3. The inner circumferential surface of the frame portion 22 here is a surface of the frame portion 22 facing the window glass 3 and is composed of a surface of the rear upright portion 22a on the front side of the vehicle, a surface of the front upright portion 22b on the rear side of the vehicle and a surface of the upper extended portion 22c on the lower side. In other words, the inner circumferential surface of the frame portion 22 is a part of an outer surface of the frame portion 22 in the vicinity of the window glass 3.
The light source 8 is configured such that the entire detection line 6 is exposed to radiation. Although four light sources 8 are used in this example to emit infrared radiation onto the detection line 6 provided on the entire inner surface of the frame portion 22, the number of the light sources 8 is not limited thereto. In addition, although the light sources 8 in this example are arranged on the upper surface of the door trim 23 in the vicinity of the camera 7, the positions of the light sources 8 are not limited thereto. For example, the light sources 8 may be arranged on the inner surface of the frame portion 22.
The detection line 6 is formed so that brightness under infrared radiation is different from surrounding members. For example, when a metal (sheet metal) constituting the door 2 and a rubber member (waist) on the vehicle body are adjacent to each other in the state that the door 2 is closed, a boundary therebetween (i.e., a boundary between the door 2 and the vehicle body) can be used as the detection line 6. Meanwhile, when the inner circumferential surface of the frame portion 22 is formed of a resin, a line formed by providing a recess on a portion of the resin so as to have a different infrared reflectance from the surroundings can be used as the detection line 6. However, it is not limited thereto. The detection line 6 may be formed by applying a highly infrared reflective paint to the inner surface of the frame portion 22, or may be an existing member of which brightness under infrared radiation is different from surroundings. The same applies to when the detection line 6 is provided on the vehicle body.
In the present embodiment, the pinch prevention operation is also performed when the blocked state is detected during when the window glass 3 is moving down. This is to prevent a part of human body such as finger from being dragged into the exit slot 21a during when the window glass 3 is moving down. A weather strip 30 having a lip seal 30aslidably in contact with the window glass 3 is provided around the exit slot 21a to prevent ingress of water, etc., into the storage portion 21 (an internal space of the door 2). When the window glass 3 is lowered, clothing or a part of human body such as finger may be dragged, together with the lip seal 30a, into the storage portion 21. In the present embodiment, it is possible to prevent such dragging and thereby to further improve safety. Here, an operation of moving down the window glass 3 is not included in the pinch prevention operation which is performed when the blocked state is detected during when the window glass 3 is moving down.
A detection surface 9 described hereinafter is a plane formed by connecting points between the optical system 71 of the camera 7 and the detection line 6 at which the foreign object when located thereon causes the blocked state. The detection surface 9 is substantially the same as a plane connecting the center of the optical system 71 (the center in the vehicle width direction, the height direction and the front-back direction of the vehicle) to the detection line 6, although depending on the specific configuration of the optical system 71. The detection surface 9 does not needs to be an entirely continuous plane. For example, when the detection line 6 is not continuous, the detection surface 9 is composed of plural planes. Meanwhile, in case that the detection line 6 is composed of dots, lines are formed when connecting points between the optical system 71 of the camera 7 and the detection line 6 at which a foreign object when located thereon causes the blocked state, and such lines are also included as the detection surface 9. When the detection surface 9 is composed of plural planes or lines, a distance between adjacent planes or lines is desirably not more than at least a thickness of young child's finger (e.g., 4 mm) to ensure safety.
As shown in
The detection surface 9 schematically shown as an example in
As shown in
Meanwhile, the maximum distance in the vehicle width direction between the detection surface 9 and the inner surface of the window glass 3 at the lower edge of the detection surface 9 is desirably not more than the maximum distance in the vehicle width direction between the detection surface 9 and the inner surface of the window glass 3 at the upper edge of the detection surface 9. This is because having a large distance in the vehicle width direction between the detection surface 9 and the inner surface of the window glass 3 at the lower edge of the detection surface 9 leads to a decrease in user convenience. That is, as a whole, the detection surface 9 is formed to be close to the window glass 3 on the lower side and far from the window glass 3 on the upper side.
As described above, pinching by the window glass 3 is likely to occur at the closing end of the window frame 25, i.e., in an upper region of the space 10. Therefore, even when the distance d1 between the camera 7 and the window glass 3 is small, the pinch prevention operation can be performed before contact between a foreign object and the window glass 3 in a region in which pinching by the window glass 3 is likely to occur, as long as a sufficiently large distance is provided between the window glass 3 and the detection surface 9 in the upper region of the space 10.
Meanwhile, in the present embodiment, since the distance between the window glass 3 and the detection surface 9 is small in a lower region of the space 10 (particularly in a region close to the camera 7), a foreign object may come into contact with the moving window glass 3 even if the pinch prevention operation is performed after detecting the foreign object. In the lower region of the space 10, there is a possibility that the foreign object comes into contact with the moving window glass 3, but it is unlikely that the foreign object gets pinched by the window glass 3 since the pinch prevention operation is performed immediately after the foreign object comes into contact with the window glass 3.
Hereinafter, the upper region of the space 10 is referred to as a non-contact region where the pinch prevention operation can be triggered before a foreign object advancing therein comes into contact with the window glass 3, and the lower region of the space 10 is referred to as a contact region where the foreign object advancing therein may come into contact with the window glass 3 before performing the pinch prevention operation.
Meanwhile, the minimum distance (a distance from the inner surface of the window glass 3 in the vehicle width direction) at which the pinch prevention operation can be performed before contact between the advancing foreign object and the window glass 3 is calculated by taking into account the anticipated advancing speed of the foreign object, the frame rate of the camera 7, the operating speed of the control unit 5 (time that elapses from when the image is captured to when it is judged that the foreign object enters) and the speed that the drive mechanism 4 stops the movement of the window glass 3 (the time that elapses before the window glass 3 stops). This minimum distance is referred to as a safe distance d3. The distance in the vehicle width direction between the detection surface 9 and the window glass 3 is not less than the safe distance d3 in the non-contact region and is less than the safe distance d3 in the contact region.
For example, given that the frame rate of the camera 7 is 400 fps (frame per second, 2.5 ms per frame), the time that elapses from when the image is captured to when it is judged that the foreign object enters is 10 ms (on the assumption that the brightness correction process, etc., requires up to 7.5 ms and the foreign object detection process requires 2.5 ms) and the time for stopping the window glass 3 is 20 ms, the window glass 3 is stopped 30 ms after the image is captured. In this case, given that the advancing speed of the foreign object is 1 m/s, the foreign object travels 30 mm in 30 ms and the safe distance d3 is thus 30 mm The advancing speed of the foreign object is 1 m/s in this example, but may be estimated to be 0.5 m/s in view of preventing, e.g., a part of elderly person's body, etc., from being pinched, and the safe distance d3 in this case is 14.5 mm. In addition, when the frame rate of the camera 7 in such case is increased to 1000 fps (1 ms per frame), the safe distance d3 is 24 mm. As such, the safe distance d3 is different depending on, e.g., required safety or performance of the used member (the camera 7 or the drive mechanism 4, etc.).
When a height h of the window frame 25 (a distance between the lower surface of the upper extended portion 22c and the upper surface of the door trim 23) is expressed as a sum of a height h2 of the non-contact region and a height h1 of the contact region, it is desirable that the height h2 of the non-contact region be as large as possible and the height h1 of the contact region as small as possible to ensure higher safety.
In detail, judging from the pinching accidents actually occurred, serious accidents occur especially when a head of child of three years of age gets caught by the window glass 3. Considering that an average head height of three-year-old children is 191 mm, the height h2 of the non-contact region is desirably at least not less than 200 mm Furthermore, the height h2 of the non-contact region is desirably not less than ½ of the height h of the window frame 25 so that the height h2 of the non-contact region is larger than the height h1 of the contact region.
When the window glass 3 is formed in a plate shape which is not curved as shown in FIGS.4A, 4B and 6, the width of the space 10 in the vehicle width direction between the detection surface 9 and the window glass 3 gradually increases from the lower edge of the detection surface 9 toward the upper edge when viewed in the cross section including the camera 7. In such a case, when a distance in the vehicle width direction between the detection surface 9 and the window glass 3 at the center of the window frame 25 in the height direction is adjusted to not less than the safe distance d3, the height h2 of the non-contact region can be not less than ½ of the height h of the window frame 25. In detail, when, for example, the safe distance d3 is 30 mm and the distance d1 in the vehicle width direction between the camera 7 and the window glass 3 is 15 mm, the distance d2 in the vehicle width direction between the detection line 6 and the window glass 3 is adjusted to not less than 45 mm so that the distance in the vehicle width direction between the detection surface 9 and the window glass 3 at the center of the window frame 25 in the height direction can be not less than the safe distance d3 and the height h2 of the non-contact region can be not less than ½ of the height h of the window frame 25.
In this case, in a vehicle of which window frame 25 has the height h of 400 mm, an inclination of the detection surface 9 with respect to the vertical direction is 4.29° when viewed in the cross section including the camera 7. Since the distance between the detection surface 2 and the window glass 3 at the lower edge of the detection surface 9 is not less than distance d1 (15 mm) and not more than the distance d2 as shown in
Although the window glass 3 having a plate shape and not curved has been described in this example, the window glass 3 in some cases can be curved and convex toward the vehicle exterior side as shown in
In the meantime, when the distance d2 in the vehicle width direction between the detection line 6 and the window glass 3 is constant, the detection surface 9 is as shown in
When such problem of decrease in convenience occurs, the detection line 6 on the lower portion of the rear upright portion 22a is omitted so that the detection surface 9 is formed in a region facing the window glass 3 in the vehicle width direction excluding a region on the lower-rear side of the vehicle, as shown in
Alternatively, as shown in
In addition, although the camera 7 provided on the door 2 has been described in the present embodiment, the camera 7 can be provided on the vehicle body. The camera 7 can be provided on, e.g., an interior ceiling of the vehicle. That is, the optical system 71 of the camera 7 may be arranged at a position corresponding to an opening formed on the interior ceiling of the vehicle so that the optical axis of the optical system 71 passes through the opening, where the opening is located in the vicinity of the window glass 3 in the state that the door 2 and the window glass 3 are closed. In this case, the camera 7 is arranged at a position relatively far from the window glass 3 as shown in
Furthermore, for the purpose of not forming the detection surface 9 in a region which is unwanted in view of improvement in convenience (an unwanted region) and faces, in the vehicle width direction, a region of the window glass 3 on the lower-rear side of the vehicle, the camera 7 may be provided on the rear upright portion 22a at a position corresponding to an upper end of the unwanted region (or at such position on the vehicle interior) as shown in
Next, a control flow of the vehicle window glass raising/lowering device 1 will be described.
As shown in
If judged as YES at Step S1, the control unit 5 controls the camera 7 to be turned on (or kept in the on-state) at Step S3 and the flow is allowed to proceed to Step S4. If the illumination intensity to capture an image by the camera 7 is not enough, the light sources 8 are turned on at Step S3, though it is not shown in the drawing.
At Step S4, the detection unit 51 (i.e., the image processing section 51a and the blocked state determination section 51b) performs a processing of detecting the blocked state (i.e., a blocked state detection processing) based on the image captured by the camera 7. After that, at Step S5, the command cancellation unit 53 judges whether or not the blocked state is detected by the detection unit 51.
If judged as YES at Step S5, the command cancellation unit 53 determines that there is a risk of being pinched by the window glass 3 and the flow is allowed to return to Step S1 without moving the window glass 3 (i.e., the signal from the switch 24 is cancelled).
If judged as NO at Step S5, the control unit 5 judges whether or not the signal input from the switch 24 is a first-level click signal (a first-level move-down click signal or a first-level move-up click signal) at Step S6.
If judged as YES at Step S6, the control unit 5 instructs the drive mechanism 4 to control the movement of the window glass 3 at Step S7.
After that, at Step S8, the detection unit 51 performs a processing of detecting the blocked state (i.e., a blocked state detection processing) based on the image captured by the camera 7. After that, at Step S9, the pinching prevention unit 52 judges whether or not the blocked state is detected by the detection unit 51.
If judged as YES at Step S9, there is a risk of being pinched by the window glass 3. Accordingly, the pinching prevention unit 52 performs a pinch prevention operation such as halting the movement of the window glass 3 or lowering the window glass 3 to the safe position at Step S10. After that, the control unit 5 terminates the movement of the window glass 3 at Step S18 and the flow is allowed to return to Step S2. As describe above, in the present embodiment, if the blocked state is detected while the first-level click signal is being input from the switch 24, the movement of the window glass 3 is terminated after performing the pinch prevention operation.
If judged as NO at Step S9, there is no risk of being pinched by the window glass 3. Accordingly, the control unit 5 judges whether or not a signal is input from the switch 24 at Step S11. If judged as NO at Step S11, this means that an operation on the switch 24 is finished. Accordingly, the control unit 5 terminates the movement of the window glass 3 at Step S18 and the flow is allowed to return to Step S2. If judged as YES at Step S11, the flow is allowed to return to Step S6 and the window glass 3 is kept moving.
On the other hand, if judged as NO at Step S6, i.e., if a second-level click signal (a second-level move-down click signal or a second-level move-up click signal) is input from the switch 24, the control unit 5 instructs the drive mechanism 4 to control the movement of the window glass 3 at Step S12.
After that, at Step S13, the detection unit 51 performs a processing of detecting the blocked state (i.e., a blocked state detection processing) based on the image captured by the camera 7. After that, at Step S14, the pinching prevention unit 52 judges whether or not the blocked state is detected by the detection unit 51.
If judged as YES at Step S14, there is a risk of being pinched by the window glass 3. Accordingly, the pinching prevention unit 52 performs a pinch prevention operation at Step S15. After that, the movement of the window glass 3 is terminated at Step S18 and the flow is allowed to return to Step S2. In other words, in the present embodiment, if the second-level click signal is input from the switch 24 and the blocked state is detected during when the window glass 3 is moving, the movement of the window glass 3 is terminated after performing the pinch prevention operation.
If judged as NO at Step S14, there is no risk of being pinched by the window glass 3. Accordingly, the control unit 5 judges whether or not the window glass 3 is moved to an edge (to the top or bottom end) at Step S16. If judge as YES at Step S16, the control unit 5 terminates the movement of the window glass 3 at Step S18 and the flow is allowed to return to Step S2. Meanwhile, the positional information of the window glass 3 may be obtained by using a rotational pulse generated by a Hall IC incorporated in the motor 41, or using current ripple.
If judged as at Step S16, it is judged whether or not a new signal is input from the switch 24 (i.e., whether or not a new signal is input after the second-level click signal is input) at Step S17. If judged as YES at Step S17, the flow is allowed to return to Step S6. If judged as NO at Step S17, the flow is allowed to return to Step S12 and the window glass 3 is kept moving. That is, if the second-level click signal is input, the window glass 3 is kept moving until the blocked state is detected, the window glass 3 is moved to an edge or a new signal is input from the switch 24.
As described above, the vehicle window glass raising/lowering device 1 in the present embodiment is configured such that the detection surface 9 is defined as a surface generated by successively arranging positions between the optical system 71 and the detection line 6 for causing the blocked state when a foreign object is located thereat, and the minimum distance in the vehicle width direction between the detection surface 9 and the inner surface of the window glass 3 at the lower edge of the detection surface 9 is smaller than the minimum distance in the vehicle width direction between the detection surface 9 and the inner surface of the window glass 3 at the upper edge of the detection surface 9.
In this configuration, since the distance between the window glass 3 and the detection surface 9 is large in an upper region in which pinching by the window glass 3 is likely to occur, it is possible to perform a pinch prevention operation before a foreign object makes contact. Meanwhile, since the distance between the window glass 3 and the detection surface 9 is small in a lower region in which a part of passenger's body, etc., is likely to come close to the window glass 3 in normal use, it is possible to prevent such a problem that the pinch prevention operation is performed despite no risk of getting pinched by the window glass 3 and the window glass 3 cannot be moved even when intended to move, hence, convenience is improved. As a result, both safety and convenience can be achieved even in, e.g., vehicles with a thin door trim 23, such as compact car classed as a small size vehicle.
Technical ideas understood from the embodiment will be described below citing the reference numerals, etc., used for the embodiment. However, each reference numeral, etc., described below is not intended to limit the constituent elements in the claims to the members, etc., specifically described in the embodiment.
[1] A vehicle window glass raising/lowering device (1), comprising: a drive mechanism (4) arranged on a vehicle door (2) to vertically move a window glass (3); a control unit (5) for controlling the drive mechanism (4); and a camera (7) for capturing an image of a detection line (6) provided on the vehicle interior side with respect to the window glass (3), the detection line (6) being along at least a part of the outer edge of the window glass (3) in a state that the door (2) and the window glass (3) are closed, wherein the camera (7) comprises an optical system (71) including at least one lens and an image pickup device (72) onto which a subject image is focused by the optical system (71), the control unit (5) comprises a detection means (51) for detecting a blocked state in which the detection line (6) captured in an image by the camera (7) is at least partially blocked by a foreign object, and a pinching prevention means (52) that causes the drive mechanism (4) to perform a pinch prevention operation for preventing pinching by the window glass (3) when the blocked state is detected by the detection means (51) during when the window glass (3) is moved by the drive mechanism (4), and aa minimum value in a vehicle width direction of a distance between a detection surface (9) and an inner surface of the window glass (3) at a lower edge of the detection surface (9) is smaller than a minimum value in the vehicle width direction of a distance between the detection surface (9) and the inner surface of the window glass (3) at an upper edge of the detection surface (9), the detection surface (9) being defined as a surface generated by successively arranging positions between the optical system (71) and the detection line (6) for causing the blocked state when the foreign object is located thereat.
[2] The vehicle window glass raising/lowering device (1) defined by [1], wherein the optical system (71) is arranged at a position corresponding to an opening (23a) formed on an upper surface of a door trim (23) so that an optical axis of the optical system (71) passes through the opening (23a), the door trim (23) being attached on a vehicle interior side of a storage portion (21) that houses the window glass (3), and the detection line (6) is provided along at least an upper portion of the outer edge of the window glass (3) in the state that the door (2) and the window glass (3) are closed, the upper portion being a closing end for the window glass (3).
[3] The vehicle window glass raising/lowering device (1) defined by [2], wherein a distance in the vehicle width direction between the detection line (6) and the window glass (3) is larger than a distance in the vehicle width direction between the camera (7) and the window glass (3).
[4] The vehicle window glass raising/lowering device (1) defined by [1], wherein the optical system (71) is arranged at a position corresponding to an opening formed on an interior ceiling of the vehicle so that an optical axis of the optical system (71) passes through the opening, the opening on the ceiling being located in the vicinity of the window glass (3) in the state that the door (2) and the window glass (3) are closed.
[5] The vehicle window glass raising/lowering device (1) defined by any one of [1] to [4], wherein the detection surface (9) is formed in a region facing the window glass (3) in the vehicle width direction excluding a region on a lower-rear side of the vehicle.
[6] The vehicle window glass raising/lowering device (1) defined by any one of [1] to [5], further comprising light sources (8) that emit infrared radiation toward the detection line (6), wherein the camera (7) comprises an infrared camera that captures the infrared radiation emitted from the light sources (8) and reflected by the detection line (6).
[7] The vehicle window glass raising/lowering device (1) defined by any one of [1] to [6], wherein the control unit (5) further comprises a command cancellation means (53) that cancels a command for moving the window glass (3) when the blocked state is detected by the detection means (51) after issuing the command and before starting movement of the window glass (3).
[8] A vehicle door (2), comprising: a storage portion (21) for housing a window glass (3); a window glass (3) that moves vertically; a drive mechanism (4) that vertically moves the window glass (3); a control unit (5) for controlling the drive mechanism (4); and a camera (7) for capturing an image of a detection line (6) provided on the vehicle interior side with respect to the window glass (3), the detection line (6) being along at least a part of the outer edge of the window glass (3) in a state that the door (2) and the window glass (3) are closed, wherein the camera (7) comprises an optical system (71) including at least one lens and an image pickup device (72) onto which a subject image is focused by the optical system (71), the control unit (5) comprises a detection means (51) for detecting a blocked state in which the detection line (6) captured in an image by the camera (7) is at least partially blocked by a foreign object, and a pinching prevention means (52) that causes the drive mechanism (4) to perform a pinch prevention operation for preventing pinching by the window glass (3) when the blocked state is detected by the detection means (51) during when the window glass (3) is moved by the drive mechanism (4), and a minimum value in a vehicle width direction of a distance between a detection surface (9) and an inner surface of the window glass (3) at a lower edge of the detection surface (9) is smaller than a minimum value in the vehicle width direction of a distance between the detection surface (9) and the inner surface of the window glass (3) at an upper edge of the detection surface (9), the detection surface (9) being defined as a surface generated by successively arranging positions between the optical system (71) and the detection line (6) for causing the blocked state when the foreign object is located thereat.
[9] The vehicle door (2) defined by [8], wherein the optical system (71) is arranged at a position corresponding to an opening (23a) formed on an upper surface of a door trim (23) so that an optical axis of the optical system (71) passes through the opening (23a), the door trim (23) being attached on a vehicle interior side of a storage portion (21), and the detection line (6) is provided along at least an upper portion of the outer edge of the window glass (3) in the state that the door (2) and the window glass (3) are closed, the upper portion being a closing end for the window glass (3).
[10] The vehicle door (2) defined by [9], wherein a distance in the vehicle width direction between the detection line (6) and the window glass (3) is larger than a distance in the vehicle width direction between the camera (7) and the window glass (3).
[11] The vehicle door (2) defined by [8], wherein the optical system (71) is arranged at a position corresponding to an opening formed on an interior ceiling of the vehicle so that an optical axis of the optical system (71) passes through the opening, the opening on the ceiling being located in the vicinity of the window glass (3) in the state that the door (2) and the window glass (3) are closed.
[12] The vehicle door (2) defined by any one of [8] to [11], wherein the detection surface (9) is formed in a region facing the window glass (3) in the vehicle width direction excluding a region on a lower-rear side of the vehicle.
[13] The vehicle door (2) defined by any one of [8] to [11], wherein further comprising light sources (8) that emit infrared radiation toward detection line (6), wherein the camera (7) comprises an infrared camera that captures the infrared radiation emitted from the light sources (8) and reflected by the detection line (6).
[14] The vehicle door (2) defined by any one of [8] to [13], wherein the control unit (5) further comprises a command cancellation means (53) that cancels a command for moving the window glass (3) when the blocked state is detected by the detection means (51) after issuing the command and before starting movement of the window glass (3).
[15] A vehicle, comprising the vehicle door (2) defined by any one of [8] to [14].
Although the embodiment of the invention has been described, the invention according to claims is not to be limited to the above-mentioned embodiment. Further, please note that all combinations of the features described in the embodiment are not necessary to solve the problem of the invention.
The invention can be appropriately modified and implemented without departing from the gist thereof. For example, although it is not mentioned in the embodiment, the vehicle window glass raising/lowering device 1 may be provided with a safety device which monitors the rotational speed of the motor 41, determines that a foreign object is pinched by the window glass when the rotational speed of the motor 41 is reduced, and performs various safety operations such as automatic lowering of the window glass 3 by reversing its movement direction.
In addition, although the invention is applied to a rear door 2 of vehicle in the embodiment, it is not limited thereto. The invention is also applicable to front doors of vehicle.
Furthermore, the invention is applied to the door 2 having the frame portion 22 in the embodiment, but is also applicable to doors of hardtop which do not have the frame portion 22 on the door 2 side.
The invention is applicable to a vehicle window glass raising/lowering device which is provided with a mechanism to prevent pinching by an automatically raising window glass.
1 VEHICLE WINDOW GLASS RAISING/LOWERING DEVICE
2 DOOR (VEHICLE DOOR)
3 WINDOW GLASS
4 DRIVE MECHANISM
5 CONTROL UNIT
6 DETECTION LINE
7 CAMERA
9 DETECTION SURFACE
21 STORAGE PORTION
22 FRAME PORTION
23 DOOR TRIM
23
a OPENING
25 WINDOW FRAME
51 DETECTION UNIT (DETECTION MEANS)
52 PINCHING PREVENTION UNIT (PINCHING PREVENTION MEANS)
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-052718 | Mar 2015 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2015/058759 | 3/23/2015 | WO | 00 |
