Patent Application
20090244741
In automotive or other vehicle environments, interior and exterior rearview mirrors can leave blind spots in an operator's field of vision. Blind spot detection systems have been proposed and developed as at least partial solutions to this challenge. In some embodiments, blind spot detectors can utilize a visual indicator, usually in the sideview or rearview mirror itself, or in close proximity thereof, to alert an operator that a vehicle or other object is in the vehicle blind spot. There has been some consideration that the visual indicator may be an annoyance or even a distraction to some vehicle operators. Auditory alarms and haptic alarms indicating an object is in the blind spot may also be perceived by some as a distraction. Thus, customer acceptance of the feature may be less than desired as the annoyance of the warning alert, such as a light in the mirror, an audio or even a haptic alert may cause some customers not to opt for such a blind spot detection system. In addition, there may be a perception that perhaps the warning, such as an audio or haptic signal, or a visual indicator light in the mirror is not entirely reliable to indicate that an object, such as another vehicle, is in the vehicle blind spot.
Some lane departure systems may also detect objects in a vehicle blind spot during vehicle operation that should be brought to the operator's attention. Specifically, when a vehicle is changing lanes or another vehicle is approaching and is in the vehicle blind spot, the lane departure system may indicate an object is in the blind spot by actuating an alarm, such as a light, making a sound, or providing a haptic warning. It is a concern that some vehicle operators may perceive such warnings as a distraction.
There is a need to provide a vehicle operator with an auxiliary system that provides actual visual contact with the object in the blind spot of a vehicle that is inexpensive and reliable.
There is a further need to provide a vehicle operator with an inexpensive way to utilize input from the blind spot detection system and/or a lane departure system, to provide a visual confirmation that an object is or is not in the blind spot so that a vehicle operator may act accordingly.
There is a continuing need for an improved method to detect objects in a vehicle blind spot that reduces operator distraction by permitting actual visual confirmation of the object in the blind spot.
These and other aspects of the invention will become apparent upon a reading of the application and claims.
In one embodiment, the present invention relates to a method to automatically move a side mounted mirror on a vehicle from an inward position to an outward position in response to a signal from a detector indicative of an object outside an operator's normal field of vision. The method may comprise;
detecting whether the object is outside the normal field of vision and transmitting a data signal from the detector to a controller indicative of the presence of the object outside the normal field of vision;
actuating at least one servo mechanism responsive to a data signal from the controller to move the mirror outwardly to an outward position from the inward position to permit an operator to view the object that is outside the normal field of vision;
maintaining the mirror in the outward position for a predetermined period of time based upon hysteresis developed by the detector after the object has moved from the detector;
actuating the servo mechanism responsive to a data signal from the controller to move the mirror from the outward position to return to the inward position upon expiration of the predetermined period of time and restore the normal field of vision to the operator.
In another embodiment, the method may include a detector that is a blind spot detection system based upon cameras, radar, lidar, ultrasonic, infrared, or motion detection.
In still another embodiment, the method may include a detector that is a lane departure system based upon cameras, radar, infrared ultrasonic, lidar or motion detection.
In yet another embodiment, the method may include an operator's manual actuation of the mirror movements to effect continuous movement of the mirror to show a wider field of vision to the operator.
In another embodiment, the method may include a full active mode of operation wherein the driver may actuate a switch or toggle to initiate an active mode of operation. The active mode of operation may comprise constantly moving the mirrors from an inward to an outward position to permit the operator to have a field of vision wider than the normal field of vision.
In still another embodiment, the present invention may be directed to a system wherein at least two vehicles are equipped with lane departure or blind spot detection systems, and further equipped with transceivers to transmit and receive signals from one another to cause the mirrors on at least one such vehicle to move outwardly in response to a signal received to provide visual confirmation that an object is in the blind spot of the vehicle.
These and other embodiments will become apparent upon a reading of the application and appended claims, without departing from the scope and spirit of the invention as set forth in the claims.
Turning now to the drawings wherein like numbers depict like structures, and particularly to
Specifically, host vehicle 16 is shown with at least one radar sensor mounted on the rear and sides of the host vehicle. Those skilled in the art recognize that whereas structures on one side of the vehicle are described, identical structures may be and preferably are mounted on the opposite side of the vehicle. Multiple overlapping radar beams 28, 30, 32, 34, 36, 38, 40 and 42 are shown, emanating from the rear and along the side of the host vehicle to detect oncoming vehicle 44 as it approaches from the rear in an adjacent lane 46. Within each radar beam, continuously programmable Maximum Range Limits 48, 50, 52, 54, 56, 58 and 60 form a sub part of each multiple radar beam, and indicate the Maximum Range Limit as continuously programmed within the ECU for detecting objects in adjacent lanes of traffic in each of the beams. Each continuously programmable Maximum Range Limit is arranged in decreasing order to provide for an overall maximum range limit of the system that will facilitate detection of approaching objects.
In order to calculate the continuously programmable Maximum Range Limit for each of the radar beams, a vision sensor 64 is used such as one would expect with a Lane Departure Warning System 66. The Lane Departure Warning System is a vision based system that uses at least one vision sensor 64, usually located in the front 19 of the vehicle behind the windshield 17 to sense the lane markings 68, guard rails, edge of road or other obstacles. The vision system is electronically connected at 61 to the ECU and continuously senses actual images and transmits the vision data to the ECU which processes the image data such that the Maximum Range Limit is calculated to be no further than the lane markers 68 or guard rails (not shown) of the adjacent lane of traffic. Specifically, the vision sensor may use lane offset and continuously modify the Maximum Range Limit of the radar sensors of the Blind Spot Detection System. Any radar data beyond the continuously programmable Maximum Range Limits for the radar beams are ignored. As each lane marking, road edge or guard rail image comes into view, the Lane Offset is re-determined, and is processed by the ECU to continuously modify the Maximum Range Limit of the radar beams of the Blind Spot Detection System. The system may further utilize lidar.
In one embodiment of the present invention, the operation of the Blind Spot Detection System may be explained in greater detail. Specifically, as host vehicle travels down a lane, the vision sensors detect the lane markings or guard rails or any other obstacle and continuously transmit such data to the ECU where it is processed and used to continuously modify the Maximum Range Limit of the radar beams of a Blind Spot Detection System. An object, such as vehicle 70 approaching a blind spot in the adjacent lane, is detected as a possible warning event when it enters into a beam, and intrudes into the maximum range limit and is detected as coming closer to the vehicle as it impinges within the maximum range area of the beams. As the vehicle 70 approaches the host vehicle, a determination is made whether the vehicle is a potential warning event. When it is determined that the distance between the vehicle and the host vehicle becomes shorter than a predetermined distance, the alarm is activated and the host vehicle operator is warned. Once the radar sensor indicates that the distance between the host vehicle and the perceived object has increased such that the perceived object is outside of the continuously programmable Maximum Range Limit, the alarm is deactivated. Those skilled in the art understand that the object may also be pedestrians, guard rails, debris, approaching vehicles in the same or an adjacent lane as the host vehicle, or any other object that may pose a potential hazard to the host vehicle. The system, as described, is further disclosed in pending U.S. patent application Ser. No. 11/786,244 filed Apr. 11, 2007, entitled “System and Method of Modifying Programmable Blind Spot Detection Sensor Ranges with Vision Input” and assigned to the assignee of the present application each incorporated herein by referenced in its entirety.
The vehicles as described in
The system and apparatus of the present invention further includes providing for a control 82 in the vehicle compartment to permit the operator of the vehicle to control the outward and inward movement of the side view with a single switch actuation to permit the operator to check the blind spots of the vehicle at any time of his/her choosing. Specifically, the control may be switch 84 in the vehicle compartment that is electrically connected at 86 to the servo mechanism in the mirror to permit the operator to select whether to rotate the mirrors outwardly or inwardly.
In another embodiment, the mirrors may be programmed to move a single event, periodically (or continuously) from an inward to an outward position and back to allow views of the blind spots. Such a feature could permit the operator to view the blind spots of the host vehicle with a manual actuation of a switch, or by voice command. In another embodiment, the movement of the mirrors may be delayed by hysteresis so that the movement of the mirrors after an object has passed from the blind spot does not distract the operator or become an annoyance. As previously disclosed, hysterisis may be accomplished by having the mirrors move outwardly for a predetermined period of time that may be fixed, and may be contained in ECU or other controller look up tables. Moreover, the mirrors may move outwardly for an operator selected period of time, whereby the ECU or other controller has a look up table of predetermined periods of time that permit the operator to select a period of time within which the mirror will remain in an outward position before returning to an inward position. In this regard, the predetermined period of time may be a function of host vehicle speed, blind spot detection system signal strength, blind spot detection range to target, traffic intensity, turn signal status, vehicle position in a lane of travel, or any other variable. In addition, the mirror may remain in an outward position as long as an object is detected in the host vehicle's blind spot. Finally, the mirror may remain in an outward position until the operator requests, perhaps by a switch actuation, voice command, or otherwise that the mirror return from its outward position to an inward position.
While at least one embodiment of the invention has been described in the specification, those skilled in the art recognize that the words used are words of description, and not words of limitation. Many variations and modifications are possible without departing from the scope and spirit of the invention as set forth in the appended claims.
