Power window apparatus for vehicle

Abstract

A power window apparatus for a vehicle is comprised of an operation switch which includes a raising contact for outputting a window raising command when set at on-state and a lowering contact for outputting a window lowering command when set at on-state, and a controller which is arranged to execute a manual operation during a time period from a start moment at which the operation switch starts outputting one of the window raising and lowering commands to a first moment at which a first predetermined time period elapses from the start moment, to execute an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period elapses from the start moment, and to execute the manual operation from the second moment.

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a power window apparatus for a vehicle, and more particularly to a power window apparatus which is capable of preventing a foreign matter from being excessively sandwiched between a window glass and a window flame.

[0002] Power window apparatuses have been widely used in automotive vehicles to facilitate driver's operations for opening and closing window glasses of a vehicle. A typical power window apparatus is capable of executing a manual operation for opening and closing a window glass for a period during which an opening/closing operation switch is set at on-state, an automatic operation for opening the window glass to a full open state and closing the window glass to a full close state, and a sandwich preventing function for preventing a foreign matter from being sandwiched between a window glass and a window frame. Since two-contact type operation switch is widely used in such a power window apparatus to lower the cost of production, a switching between the manual operation and the automatic operation is executed on the basis of a time period during which the operation switch is being turned on.

SUMMARY OF THE INVENTION

[0003] However, such a power window apparatus employing a two-contact type operation switch has a problem that it is difficult, due to an operational limitation of the two-contact type operation switch, to smoothly execute both of a positional justification of a window glass and an accurate detection of a foreign matter sandwiched between the window glass and a window frame.

[0004] It is therefore an object of the present invention to provide an improved power window apparatus which is capable of smoothly executing both of a positional justification of a window glass and an accurate detection of a foreign matter so as to enable a window closing operation even under a large-frictional condition of the window glass.

[0005] An aspect of the present invention resides in a power window apparatus for a vehicle which comprises: a drive motor for raising and lowering a window glass; an operation switch comprising a raising contact which outputs a window raising command when the raising contact is set at on-state and a lowering contact which outputs a window lowering command when the lowering contact is set at on-state; and a controller coupled to the drive motor and the operation switch. The controller is arranged to execute a manual operation during a time period from a start moment at which the operation switch starts outputting one of the window raising and lowering commands to a first moment at which a first predetermined time period elapses from the start moment, to execute an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period elapses from the start moment, and to execute the manual operation from the second moment.

[0006] Another aspect of the present invention resides in a method of controlling a drive motor for raising and lowering a window glass which comprises a step for executing a manual operation during a time period from a start moment at which an operation switch outputs one of a window raising and lowering commands to a first moment at which a first predetermined time period has elapsed from the start moment; a step executing an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period has elapsed from the start moment, and a step for executing the manual operation from the second moment.

[0007] A further another aspect of the present invention resides in a power window apparatus for a vehicle, comprising: a drive motor for raising and lowering a window glass; an operation switch outputting a window closing command when a vehicle occupant turns on the operation switch; a rotation detector attached to the drive motor and detecting a rotation speed of the drive motor; and a controller coupled to the drive motor, the operation switch and the rotation detector. The controller is arranged to operate the drive motor so as to raise the window glass from a start moment at which the operation switch outputs the window raising command, to count an elapsed time from the start moment, to calculate a load applied to the drive motor on the basis of the rotation speed of the drive motor, to stop operating the drive motor when the load is greater than a predetermined load, to operate the drive motor so as to lower the window glass when the operation switch stops outputting the window raising command before the elapsed time reaches a predetermined time period and when the load is greater than the predetermined load, to restart the operation of the drive motor to raise the window glass from a moment at which the elapsed time reaches the predetermined time period and when the operation switch continues outputting the window raising signal.

[0008] The other objects and features of this invention will become understood from the following description with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a block diagram showing a power window apparatus according to an embodiment of the present invention.

[0010] FIG. 2 is a timing chart showing a main operation of the power window apparatus of FIG. 1.

[0011] FIG. 3 is a flowchart showing a control procedure executed in the event that a foreign matter is sandwiched during the window raised by the power window apparatus of FIG. 1.

[0012] FIGS. 4A, 4B and 4C are timing charts showing the operations of a drive motor in the event that a foreign matter is sandwiched during the window raising period.

DETAILED DESCRIPTION OF THE INVENTION

[0013] Referring to FIGS. 1 through 4C, there will be discussed an embodiment according to the present invention.

[0014] FIG. 1 is a block diagram showing a structure of a power window apparatus 1 according to the embodiment of the present invention. In this Figure, power window apparatus 1 comprises a drive motor M1 which moves a window glass (not shown) to an opening direction (lowering direction) and a closing direction (raising direction), a controller 2 and an operation switch (opening/closing operation switch) 3. Further, power window apparatus 1 comprises a raising drive section 4a for applying a raising control signal to drive motor M1 to raise the window glass, and a lowering drive section 4b for applying a lowering control signal to drive motor M1 to lower the window glass, and a rotation detector (load detecting means) 5 for detecting a rotation speed of drive motor M1.

[0015] Operation switch 3 comprises a raising contact 3a which outputs a window raising command to controller 2 during when raising contact 3a is turned on, and a lower contact 3b which outputs a window lowering command to controller 2 during when lowering contact 3a is turned on. A vehicle occupant manually operates operation switch 3.

[0016] Subsequently, there will be discussed the manner of operation of power window apparatus 1 according to the present invention.

[0017] When a vehicle occupant operates operation switch 3, controller 2 detects the window raising command or window lowering command of the vehicle occupant through the operation switch 3. When raising contact 3a is turned on, controller 2 outputs the raising control signal to raising drive section 4a. When lowering contact 3b is turned on, controller 2 outputs the lowering control signal to lowering drive section 4b.

[0018] During these operations, when an operation time period TOP, which is a time period during which one of raising contact 3a and lowering contact 3b is set at on-state, is smaller than a first predetermined time period T1 or is greater than or equal to a second predetermined time period T2 which is greater than first predetermined time period T1 (TOP<T1 or T2≦TOP), controller 2 outputs one of the raising and lowering control signals according to operation time period TOP. That is, a manual operation is executed. On the other hand, when operation time period TOP is greater than or equal to first predetermined time period T1 and is smaller than second predetermined time period T2 (T1≦TOP<T2), controller 2 outputs one of the raising and lowering control signals to raise or lower the window glass to a full close state or a full open state.

[0019] Herein, the manual operation executed during which operation time period TOP is smaller than first predetermined time period T1 is called a short manual operation. The operation executed during which operation time period TOP is greater than or equal to first predetermined time period T1 and is smaller than second predetermined time period T2 is called a one-touch automatic operation. The manual operation executed during which operation time period TOP is greater than or equal to second operation time period T2 is called a long manual operation.

[0020] Each of raising and lowering drive sections 4a and 4b is normally set so that both terminals of drive motor M1 are connected to the earth side. When one of drive sections 4a and 4b receives the control signal, the one of raising and lowering drive sections 4a and 4b changes the connection of drive motor M1 from the earth side to the power source side so as to operate drive motor M1.

[0021] In FIG. 2, an upper time chart shows on and off timings of raising contact 3a, and a lower time chart shows an operating condition of drive motor M1. As shown in FIG. 2, when operation time period TOP is shorter than first predetermined time period T1, the short manual operation is executed. That is, the window glass is raised only for a time period during which the raising contact 3a is set at the on-state.

[0022] Further, when operation time period TOP is longer than or equal to second predetermined time period T2, the long manual operation is executed. That is, the window glass is also raised only for a time period during which the raising contact 3a is set at the on-state.

[0023] Furthermore, when operation time period TOP of raising contact 3a is within a range from first predetermined time period T1 to second predetermined time period T2 (T1≦TOP<T2), the one-touch automatic operation is executed. Therefore, the window glass is raised to the full close state by this one-touch automatic operation.

[0024] That is, when the short or long manual operation is executed, drive motor M1 is driven for a period during which one of raising contact 3a and lowering contact 3b is set at on-state. On the other hand when the one-touch automatic operation is executed, drive motor M1 is driven until the window glass is fully closed or fully opened.

[0025] Power window apparatus 1 according to the present invention is arranged to calculate a predicted load LP on the basis of the output signal of rotation detector 5. Predicted load LP represents a magnitude of a load which will be applied to the window glass when the window glass is raised by operating the drive motor M1. That is, rotation detector 5 detects the rotation speed of drive motor M1 and outputs the detection signal indicative of the rotation speed to controller 2. Controller 2 calculates the magnitude of load (predicted load) LP applied to drive motor M1 from the magnitude of the predicted load LP and determines whether or not a foreign matter is sandwiched between the window glass and a window frame. It will understood that a method of obtaining the magnitude of the predicted load LP is not limited to this, and the magnitude of the predicted load LP may be obtained on the basis of the power consumption of drive motor M1.

[0026] When controller 2 determines that the predicted load LP is greater than a predetermined value, the raising of the window glass is temporally stopped. Further, when raising contact 3a of operation switch 3 is maintained at the on-state thereafter, controller 2 restarts the raising operation of the window glass.

[0027] With reference to a flowchart of FIG. 3, the operation of power window apparatus 1 according to the present invention will be discussed in detail.

[0028] At step S1, controller 2 determines whether or not raising contact 3a of operation switch 3 is set at on-state. When the determination at step S1 is affirmative, the routine proceeds to step S2. When the determination at step S1 is negative, the routine repeats step S1 until the determination at step S1 is turned to the affirmative determination.

[0029] At step S2, controller 2 executes the window raising operation. More specifically, controller 2 outputs the raising control signal to raising drive section 4a to operate drive motor M1 so as to raise the window glass.

[0030] At step S3, controller 2 determines whether or not the predicted load LP, which will be applied to the window glass, is greater than a predetermined value LTH, on the basis of an output signal of rotation detector 5. When the determination at step S3 is negative (LP≦LTH), the routine jumps to step S5 without stopping drive motor M1. When the determination at step S3 is affirmative (LP>LTH), the routine proceeds to step S4 wherein controller 2 stops drive motor M1 by the cancellation of outputting the raising control signal.

[0031] At step S5, controller 2 determines whether or not the operation time period TOP, during which raising contact 3a is set at the on-state, is greater than or equal to second predetermined time period T2. When the determination at step S5 is negative (TOP<T2), the routine proceeds to step S6.

[0032] At step S6, controller 2 determines whether or not raising contact 3a of operation switch 3 is set at on-state. When the determination at step S6 is affirmative, the routine returns to step S3 to repeat steps S3 and S5 until the affirmative determination is made at step S5. That is, controller 2 outputs the raising control signal to raising drive section 4a to drive the drive motor M1 in the window raising direction. When the determination at step S6 is negative, that is, when raising contact 3a is set at off-state, the routine proceeds to step S7.

[0033] At step S7, controller 2 determines whether or not drive motor M1 is set at stop state. When the determination at step S7 is affirmative, the routine proceeds to step S14 wherein controller 2 executes a reverse operation. More specifically, controller 2 outputs the lowering control signal to lowering drive section 4b to drive the drive motor M1 toward the window lowering direction. That is, in the event that the predicted load LP becomes greater than a predetermined load LTH during the window raising operation after the operator turns on raising contact 3a, and that the operator then turns off raising contact 3a, controller 2 determines that a foreign matter is sandwiched between the window glass and a window frame. Therefore, controller 2 inversely drives the drive motor M1 to lower the window glass. This operation prevents a foreign matter from being excessively sandwiched between the window glass and the window flame.

[0034] On the other hand, when the determination at step S7 is negative, that is, when drive motor M1 continues the on-state, the routine proceeds to step S8 wherein controller 2 determines whether or not the operation time period TOP is smaller than a first predetermined time period T1. When the determination at step S8 is affirmative (T1>TOP), the routine proceeds to step S12 wherein controller 2 stops the operation of drive motor M1 by the cancellation of outputting the raising control signal to raising drive section 4a. When the determination at step S8 is negative (T1≦TOP), the routine proceeds to step S13 wherein controller 2 executes a one-touch automatic operation.

[0035] On the other hand, when the determination at step S5 is affirmative (TOP>T2), the routine proceeds from step S5 to step S9 wherein controller 2 determines whether or not drive motor M1 is set at stop state. When the determination at step S9 is affirmative, the routine proceeds to step S10 wherein controller 2 outputs the raising control signal to raising drive section 4a to drive the drive motor M1 so as to raise the window glass.

[0036] Thereafter, the long manual operation is executed. Accordingly, at step S11 controller 2 detects a moment at which raising contact 3a is turned off by determining whether raising contact 3a is put in the on-state or not. When the determination at step S11 is negative, that is, when it is determined that raising contact 3a is set at off state, the routine proceeds to step S15 wherein controller 2 stops outputting the raising control signal to raising drive section 4a to stop drive motor M1.

[0037] As discussed above, drive motor M1 is selectively set at one of on-state, the inverse-on-state and the stopping state according to the on-and-off operation by the vehicle occupant and according to the magnitude of the predicted load LP.

[0038] Referring to FIGS. 4A through 4C, there will be explained the operations of the power window apparatus according to the present invention. FIG. 4A is a timing chart under a condition that the short manual operation is executed, FIG. 4B is a timing chart under a condition that the one-touch automatic operation is executed. FIG. 4C is a timing charts under a condition that the long manual operation is executed.

[0039] As shown in FIG. 4A, in the event that the operation time period TOP of raising contact 3a is smaller than first predetermined time period T1 (TOP<T1) and that a foreign matter is sandwiched between the window glass and the window frame, the sandwiching load gradually increases after raising contact 3a is turned on, and drive motor M1 is then stopped at a moment at which the predicted load LP reaches the predetermined load LTH. Thereafter, the raising contact 3a is turned off, and drive motor M1 is then inversely operated to lower the window glass. This arrangement prevents a sandwiching problem of the window glass.

[0040] Further, as shown in FIG. 4B, in the event that the operation time period TOP of raising contact 3a is within a range from first predetermined time period T1 to second predetermined time period T2 (T1≦TOP<T2), similarly the drive motor M1 is stopped at a moment at which the predicted load LP reaches the predetermined load LTH, and the drive motor M1 is inversely operated after the raising contact 3a is turned off.

[0041] Furthermore, as shown in FIG. 4C, in the event that the operation time period Top of raising contact 3a is greater than or equal to second predetermined time period T2 (TOP≧T2), drive motor M1 is temporally stopped at a moment at which sandwiching load LP reaches the predetermined load LTH. Thereafter, when the operation time period TOP of raising contact 3a becomes equal to second predetermined time period T2 elapsed, drive motor M1 is again driven to raise the window glass. Accordingly, even when controller 2 determines that a foreign matter is sandwiched between the window glass and the window frame from the reason that the sliding friction of the window glass increases, by continuing the on-state of raising contact 3a, the window glass is raised. That is, even if an erroneous detection due to the sliding friction occurs, power window apparatus 1 according to the present invention can suitably adapt to such a situation.

[0042] With the thus arranged power window apparatus 1 according to the present invention, by turning on operation switch 3 for a period that the operation time period TOP is smaller than first predetermined time period T1, the short manual operation is executed so that the operator can finely control the position of the window glass. Further, by turning on operation switch 3 for a period that the operation time period TOP is within the range from first predetermined time period T1 and second predetermined time period T2, the one-touch automatic operation is executed. This enables the window glass to be easily set at the full-close state or full-open state. Furthermore, by turning on operation switch 3 for a period that the operation time period TOP is greater than second predetermined time period T2, the long manual operation is executed. This enables the window glass to be stopped at a predetermined position.

[0043] Furthermore, in the event that the window glass is raised by the short manual operation or the one-touch automatic operation, if the predicted load LP increases, drive motor M1 is temporally stopped. Thereafter, drive motor M1 is inversely operated to lower the window glass. This prevents a trouble caused by sandwiching a foreign matter between the window glass and the window frame.

[0044] Furthermore, in the event that the operator continues turning-on of operation switch 3 even after drive motor M1 is stopped, the window glass is raised by this continuation of the turning-on of operation switch 3. Accordingly, even if the sliding friction of the window glass increases, it is possible to raise the window glass by the manual continuous turning-on operation by the vehicle occupant.

[0045] This application is based on Japanese Patent Application No. 2001-280136 filed on Sep. 14, 2001 in Japan. The entire contents of this Japanese Patent Application are incorporated herein by reference.

[0046] Although the invention has been described above by reference to certain embodiments of the invention, the invention is not limited to the embodiments described above. Modifications and variations of the embodiments described above will occur to those skilled in the art, in light of the above teaching. The scope of the invention is defined with reference to the following claims.

Claims

1. A power window apparatus for a vehicle, comprising: a drive motor for raising and lowering a window glass; an operation switch comprising a raising contact which outputs a window raising command when the raising contact is set at on-state and a lowering contact which outputs a window lowering command when the lowering contact is set at on-state; and a controller coupled to the drive motor and the operation switch, the controller being arranged, to execute a manual operation during a time period from a start moment at which the operation switch starts outputting one of the window raising and lowering commands to a first moment at which a first predetermined time period elapses from the start moment, to execute an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period elapses from the start moment, and to execute the manual operation from the second moment.

2. The power window apparatus as claimed in claim 1, further comprising a load detecting device which detects a load applied to the drive motor, the controller stopping a window raising operation of the drive motor when the load detector detects that the load applied to the drive motor is greater than a predetermined load at a moment before the second moment.

3. The power window apparatus as claimed in claim 2, wherein the controller starts a window lowering operation of the drive motor when the operation switch stops outputting the window raising command before the second moment.

4. The power window apparatus as claimed in claim 2, wherein the controller restarts the window raising operation when the operation switch continues outputting the window raising command after the second moment.

5. The power window apparatus as claimed in claim 4, wherein the controller stops the window raising operation when the operation switch stops outputting the window raising command.

6. The power window apparatus as claimed in claim 1, wherein the manual operation includes a window raising operation of raising the window glass for a time period during which the raising contact is set at on-state and a window lowering operation of lower the window glass for a time period during which the lowering contact is set at on state, and the automatic operation includes a one-touch automatic operation by which the window glass is raised to a full close state or lowered to a full open state.

7. The power window apparatus as claimed in claim 1, further comprising a raising drive section and a lower drive section through which the controller controls the operation of the drive motor.

8. A method of controlling a drive motor for raising and lowering a window glass, comprising: executing a manual operation during a time period from a start moment at which an operation switch outputs one of a window raising and lowering commands to a first moment at which a first predetermined time period has elapsed from the start moment; executing an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period has elapsed from the start moment, and executing the manual operation from the second moment.

9. A power window apparatus for vehicle, comprising: driving means for raising and lowering a window glass; switch means for outputting one of a window closing command and a window opening command according to an intent of a vehicle occupant; first execution means for executing a manual operation during a time period from a start moment at which the operation switch outputs one of the window raising and lowering commands to a first moment at which a first predetermined time period has elapsed from the start moment, second execution means for executing an automatic operation during a time period from the first moment to a second moment at which a second predetermined time period has elapsed from the start moment, and third execution means for executing the manual operation from the second moment.

10. A power window apparatus for a vehicle, comprising: a drive motor for raising and lowering a window glass; an operation switch outputting a window closing command when a vehicle occupant turns on the operation switch; a rotation detector attached to the drive motor and detecting a rotation speed of the drive motor; and a controller coupled to the drive motor, the operation switch and the rotation detector, the controller being arranged, to operate the drive motor so as to raise the window glass from a start moment at which the operation switch outputs the window raising command, to count an elapsed time from the start moment, to calculate a load applied to the drive motor on the basis of the rotation speed of the drive motor, to stop operating the drive motor when the load is greater than a predetermined load, to operate the drive motor so as to lower the window glass when the operation switch stops outputting the window raising command before the elapsed time reaches a predetermined time period and when the load is greater than the predetermined load, to restart the operation of the drive motor to raise the window glass from a moment at which the elapsed time reaches the predetermined time period and when the operation switch continues outputting the window raising signal.

11. The power window apparatus as claimed in claim 10, wherein the controller executes an automatic operation for raising the window glass to a full close state when the window closing command is outputted for a time period ranging from a first predetermined period to the predetermined period and when the load is smaller than or equal to the predetermined load.