JP3568761B2 - Power window device with safety device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention raises and lowers the window glass of a vehicle by a driving source such as a motor, detects a foreign object caught between the window glass and a sash, performs a safety control operation, and performs a failure when a limit switch or the like fails. And a power window device with a safety device to which a highly convenient fail-safe function is added.
[0002]
[Prior art]
2. Description of the Related Art Automobiles are equipped with a power window device that automatically opens and closes a window glass (up-down operation). In this power window device, a foreign object such as a hand or a head is often sandwiched between the window glass and the sash. In this case, the vehicle is equipped with a safety device that detects the entrapment of a foreign object, stops the up-down operation of the window glass, and performs a safety control operation to prevent an accident before it occurs.
[0003]
In this safety device, a pulse generator (pulse sensor) generates a pulse having a frequency corresponding to the number of rotations of the motor driving the window glass, and the speed detector detects the rotation speed of the motor based on the generated pulse. When the rotation speed of the motor decreases, it is detected that a foreign object has been caught in the window glass, and a safety control operation for lowering the window glass is performed to prevent the clogging.
[0004]
A limit switch as a position detection switch is provided in the vicinity of the fully closed region, and a region below the limit switch mounting position is defined as a safety control region by a position detection signal when the limit switch is OFF. In addition, the pinch detection is performed to perform the safety control operation.
[0005]
On the other hand, according to the position detection signal when the limit switch is ON, the area above the limit switch mounting position is set as the non-safety control area (fully closed area), and the safety control operation is canceled.
[0006]
[Problems to be solved by the invention]
However, the limit switch may fail. For example, if a failure occurs with the limit switch kept OFF, even if the window glass is completely closed, it is determined that the window glass is jammed and the window glass is lowered. Also, if the up instruction is continued with an auto-up switch or the like, the entrapment is detected during the up operation and the window glass is lowered for a predetermined time, and then the window glass is raised by the up instruction and the entrapment is detected again. Since the sandwiching is repeated, the window glass cannot be fully closed.
[0007]
For this reason, as a fail-safe function when the limit switch has failed, for example, a method of stopping the auto-up function when three consecutive foreign objects are detected is detected.
[0008]
Further, a method of repeating the process of lowering the window glass by a predetermined lowering amount, for example, 40 cm, and raising and stopping the window glass from the position of the predetermined lowering amount by, for example, 5 cm, and completely closing the window glass may be considered.
[0009]
However, since the window glass is raised by 5 cm at a time, it takes a considerable time for the window glass to reach the fully closed position. In the region where the position of the window glass is 0.4 cm to 20 cm from the fully closed position (upper position), the pinching prevention function is required according to the American FMVSS standard, but the position of the window glass is 0.4 cm from the upper position. In the case below the region of ２０20 cm, the anti-jamming function (safety control operation) is not particularly necessary.
[0010]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a power window device with a safety device that detects a failure of a limit switch and performs a fail-safe function only in a necessary area and has a more convenient function.
[0011]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems. According to the first aspect of the present invention, the window glass of the vehicle is moved up and down by a drive source, a safety control area of the window glass is determined by a signal from a position detection switch, and a pulse signal having a frequency corresponding to the rotation speed of the drive source is generated. A power window device with a safety device for detecting safety of a foreign object in a safety control area based on a pulse signal and detecting a foreign object in the safety control region based on a pulse signal. A pinching counting means for counting the number of pinchings when pinching is detected; and determining that the position detection switch has failed when the number of pinchings has reached a predetermined number of pinchings, lowering the window glass and stopping at the fully open position. and failure determination means for, up from the window glass is fully open position after the window glass is stopped at the fully open position Rutoki, a pulse counting means for counting the number of pulses of the pulse signal of said generating means from the fully open position, from the fully open position the window glass on the basis of the count pulse count to a predetermined position of a predetermined length below the fully closed position The region where the safety control operation is not required is continuously raised, and the region where the safety control operation is required from a predetermined position to the vicinity of the fully closed position and the fully closed region from the vicinity of the fully closed position to the fully closed position are a window. glass was the up by a predetermined amount, characterized in that it comprises an up output control means for performing repeatedly the up output stop process to stop.
[0012]
According to the present invention, when the detection means detects a plurality of pinchings while the window glass is up, the pinching counting means counts the number of pinchings, and when the counted number of pinchings reaches the predetermined number of pinchings, a failure determination is made. The means determines that the position detection switch has failed and lowers the window glass to stop at the fully open position. Then, when the window glass rises from the fully open position after the window glass stops at the fully open position, when the pulse counting means counts the number of pulses of the pulse signal of the generating means from the fully open position, the up output control means outputs the counted pulse. Based on the count value, the area where the safety control operation is not required from the fully opened position to the predetermined position below the fully closed position by a predetermined length from the fully opened position is continuously increased, and the safety control operation from the predetermined position to the vicinity of the fully closed position is performed. fully closed region up to the fully closed position from the vicinity of the required space and the fully closed position is performed repeatedly up output stop processing for stopping by up window glass by a predetermined amount.
[0013]
In this way, when the position detection switch fails, the failure is detected, and further, the position of the window glass is detected, and the safety control operation is not required so much from the fully open position to the predetermined position below the fully closed position by a predetermined length . In the region, the window glass is continuously raised, and in a region above a predetermined position where the safety control operation is required, the up output stop process of gradually raising and stopping the window glass is repeatedly performed until the fully closed position. That is, by performing the fail-safe function only in the area where the safety control operation is required, the function becomes more convenient.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a power window device with a safety device according to the present invention will be described in detail with reference to the drawings. The power window device with a safety device according to the present invention is mounted on each of a driver's seat unit, a passenger seat unit, a left rear seat unit, and a right rear seat unit of an automobile, and detects a state in which a foreign object is caught in the window glass to achieve safety. Perform control operation.
[0018]
FIG. 1 shows a schematic configuration block diagram of a power window device with a safety device mounted on each unit. In the power window device with a safety device shown in FIG. 1, the power window switch 1 includes a constant voltage supply circuit 5, a SW input circuit 10, a microcomputer 21, a driver 41, and a pulse counter 45. The constant voltage supply circuit 5 converts the voltage from the power supply 3 into a constant voltage and supplies the constant voltage to the microcomputer 21. The voltage from the power supply 3 is supplied to the driver 41 and the pulse counter 45.
[0019]
The microcomputer 21 is connected to the SW input circuit 10, the driver 41, the pulse counter 45, and the limit switch 8. A motor 25 is connected to the driver 41, and a pulse generator 24 is arranged adjacent to the motor 25, and a pulse counter 45 is connected to the pulse generator 24.
[0020]
FIG. 2 shows a detailed configuration block diagram of a power window device with a safety device mounted on each unit. In the power window device with a safety device shown in FIG. 2, the SW input circuit 10 includes an up switch 11, a down switch 13, an auto up switch 15, and an auto down switch 17.
[0021]
The microcomputer 21 receives the operation signals from these switches and commands the opening and closing operation of the window glass 7. The motor 25 constitutes a drive source, and receives a signal from the microcomputer 21 via the driver 41 to open and close the window glass 7.
[0022]
The microcomputer 21 performs the safety control operation and limits the power window operation in the event of an abnormality such as a failure of the limit switch 8 or the pulse generator 24. The microcomputer 21 includes a safety control area determination unit 31, a speed detection unit 33, and a pinch detection unit. 35, a safety control operation command section 37, an operation command section 39, a pinch counter 43, a failure determination section 45, a pulse counter 47, and an up output control section 49.
[0023]
The up switch 11 causes the window glass 7 to perform an up operation, the down switch 13 causes the window glass 7 to perform a down operation, the auto up switch 15 automatically performs a fully closing operation, and the auto down switch 17 performs a fully opening operation. Let it be done automatically.
[0024]
The limit switch 8 detects the position of the window glass 7 and is turned on when the window glass 7 moves to a position near a predetermined fully closed position A (shown in FIG. 3) within the stroke of the window glass 7. And a position detection switch that outputs a position detection signal. The pulse generator 24 is a rotation detection sensor (pulse sensor) that detects the number of rotations of the rotation shaft of the motor 25 and generates a pulse signal having a frequency corresponding to the rotation speed of the motor 25.
[0025]
The safety control area determination unit 31 determines whether the open / close position of the window glass 7 is a pinch detection area (safety control area) excluding the vicinity of the fully closed position (fully closed area) based on a position detection signal from the limit switch 8. The safety control operation is performed in the safety control area.
[0026]
When the window glass 7 reaches a position near the fully closed position when the window glass 7 moves to the fully closed position, the limit switch 8 is turned on to generate a position detection signal, and the window glass 7 is moved from the fully open position B (shown in FIG. 3). During the movement to the position near the fully-closed position, the signal is turned off and no position detection signal is generated. The safety control area determining unit 31 cancels the safety control operation when the position detection signal is input, and performs the safety control operation when the position detection signal is not input.
[0027]
The speed detection unit 33 detects the interval time from the rise of the pulse signal from the pulse generator 24 to the next rise to detect the rotation speed (absolute speed) of the motor. The entrapment detection unit 35 detects entrapment of a foreign object when the rotation speed is equal to or less than a predetermined value by comparing the rotation speed of the motor 25 detected by the speed detection unit 33 with a predetermined value. It should be noted that during the up output, the absence of a pulse edge is detected for a predetermined time or more, and when the limit switch 8 is ON, the output is stopped assuming that the fully closed position has been detected.
[0028]
The safety control operation command unit 37 controls the operation command unit 39 based on the output from the safety control area determination unit 31 and the pinch detection signal from the pinch detection unit 35 to perform the safety control operation. As a safety control operation, the window glass is stopped at the sandwiching position, and then the window glass is lowered by a predetermined amount from the sandwiching position. The driver 41 rotationally drives the motor 25 based on the output from the operation command unit 39. Here, the limit switch ON indicates that the limit switch 8 is closed, and the limit switch OFF indicates that the limit switch 8 is open.
[0029]
If the limit switch 8 is OFF (the window glass 7 is open) and a failure occurs while the limit switch 8 is OFF, the safety control operation command unit 37 determines that the window glass 7 is pinched even if the window glass 7 is fully closed, and moves the window glass 7 by a predetermined amount. The safety control operation for lowering is performed, and the safety control operation is repeatedly performed by a pinch detection signal continuously transmitted from the pinch detection unit 35 in response to an up input from the auto up switch 15 or the like.
[0030]
The entrapment counter 43 counts the number of entrapments based on an entrapment detection signal from the entrapment detection unit 35 when a failure occurs while the limit switch 8 remains OFF.
[0031]
The failure determination unit 45 determines whether the pulse count value of the pinch counter 43 is a predetermined number of times (for example, three times), and determines that the limit switch 8 has failed if the pulse count value is the predetermined number of times. Then, the operation command unit 39 is controlled so that the window glass 7 is lowered to, for example, the fully open position B and then stopped without being pinched.
[0032]
The pulse counter 47 counts the number of pulses of the pulse signal output from the pulse generator 24 when the limit switch 8 is determined to have failed and the window glass 7 has risen from the fully closed position. Detect the position of. Therefore, when the position of the window glass 7 is at the fully open position B (first position), the pulse of the pulse signal is set to “0”.
[0033]
The up output control 49 determines whether the pulse count value of the pulse counter 45 has exceeded a predetermined number of pulses when the window glass 7 is moving up from the fully open position B, and when the pulse count value has exceeded the predetermined number of pulses. , The operation command unit 39 is controlled to stop the window glass 7 at the predetermined position C (second position). The amount of movement from the fully open position B (first position) to the predetermined position C (second position) corresponds to the first predetermined amount.
[0034]
In this case, the pulse count value is compared with a predetermined number of pulses to limit the up output of the window glass 7. For example, the time is counted by a pulse timer as a timer, and the counting time is compared with the predetermined time. The up output of the window glass 7 may be limited.
[0035]
Further, after the window glass 7 has been raised to the predetermined position C, the up output control 49 controls the operation command unit 39 to move the window glass 7 from the predetermined position C by a certain amount L (smaller than the first predetermined amount). The process of incrementing by the second predetermined amount) is repeated up to the fully closed position A.
[0036]
Next, the processing of the power window device with the safety device thus configured will be described with reference to the flowchart shown in FIG. First, when the up switch 11 or the auto up switch 17 is operated, the operation command section 39 determines whether or not there is an input from the up switch 11 or the auto up switch 17 (step S11).
[0037]
If there is an input from the switch, an operation signal from the switch is sent to the driver 41, and the driver 41 drives the motor 25 to rotate, thereby raising the window glass 7 (step S13).
[0038]
Next, the failure determination unit 45 determines whether the number of times the foreign object has been pinched is n times, for example, 3 or more (step S15). If the number of times of pinching is less than n times, the safety control area determination unit 31 determines whether the limit switch 8 is OFF (step S17).
[0039]
When the limit switch 8 is OFF, the speed detection unit 33 detects the rotation speed of the motor based on the pulse signal from the pulse generator 24, and the entrapment detection unit 35 detects the motor speed detected by the speed detection unit 33. It is determined whether or not a foreign object has been trapped by comparing the rotation speed of No. 25 with a predetermined value (step S19).
[0040]
If a foreign object is detected, the counter 43 increments the number of times by one. Then, the safety control operation command unit 37 controls the operation command unit 39 to lower the window glass 7 by a predetermined amount and stop the window glass 7 at that position (step S21).
[0041]
Next, the failure determination unit 45 determines that the limit switch 8 has failed when the number of times of pinching becomes three times, for example, by an auto-up instruction or the like, that is, when three consecutive pinchings are detected. In this case, since the state in which the window glass 7 cannot be fully closed is continued, the window glass 7 is lowered from the pinch detection position to the fully open position B (step S23).
[0042]
Next, when the up switch 11 or the auto up switch 17 is operated, the driver 41 drives the motor 25 to rotate, and raises the window glass 7 from the fully open position B (step S25).
[0043]
At this time, since the number of pulses of the pulse signal from the pulse generator 24 is set to "0" while the window glass 7 is in the fully open position B, the pulse counter 47 sets the number of pulses to "0". After confirming that, the position of the window glass 7 is detected by counting the number of pulses of the pulse signal from the pulse generator 24.
[0044]
Then, until the counted number of pulses reaches the predetermined number of pulses, that is, the up output control unit 49 continuously raises the window glass 7 from the fully open position B to the predetermined position C as shown in FIG. 3 ( Step S27). The predetermined position C is a position about 20 cm below the upper end. That is, the area from the fully open position B to the predetermined position C is an area where the safety control operation (entrapment prevention function) is not so necessary. In this area, the up time can be shortened by continuously raising the window glass 7. it can.
[0045]
Further, when the counted number of pulses exceeds the predetermined number of pulses, the up output control unit 49 performs an up output stop process of raising the window glass 7 from the predetermined position C by a constant amount L based on the number of pulses. The operation is repeatedly performed up to the fully closed position A (step S29).
[0046]
For example, as shown in FIG. 3, the window glass 7 is moved up from the predetermined position C by a fixed amount L, for example, 5 cm, and stopped at the position D. Next, the window glass 7 is moved up from the position D by a fixed amount L, for example, 5 cm. Then, the up output stop process of stopping at the position E is repeatedly performed up to the fully closed position A.
[0047]
The area from the predetermined position C to the vicinity of the fully closed position A is an area where a safety control operation (an anti-jamming function) is required. In this area, the window glass 7 is raised and stopped little by little. That is, by adding the fail-safe function only to the necessary area, the function becomes more convenient.
[0048]
On the other hand, if there is no up switch input in step S11, it is determined whether the down switch 13 or the auto down switch 17 has been input (step S31). If the down switch 13 or the auto down switch 17 has been input, The driver 41 rotationally drives the motor 25 to lower the window glass 7 (step S33). If there is no down switch input in step S31, the output is stopped (step S35).
[0049]
As described above, in the embodiment, when the counted number of times of pinching reaches the predetermined number of times of pinching, it is determined that the limit switch 8 has failed, the window glass 7 is lowered, and the window glass 7 is stopped at the fully open position B, and the window glass 7 is stopped. When the window glass 7 rises from the fully open position B after stopping at the fully open position B, the window glass 7 is continuously raised from the fully open position B to the predetermined position C, and the window glass 7 is increased by a fixed amount from the predetermined position C. The up output stop process of stopping by increasing by L is repeatedly performed up to the fully closed position A.
[0050]
As described above, when the limit switch 8 fails, the failure is detected, and furthermore, the position of the window glass 7 is detected. In the region from the fully open position B to the predetermined position C where the safety control operation is not so necessary, the window glass is detected. In the region above the predetermined position C where the safety control operation is required, the up output stop process of raising the window glass 7 little by little and stopping it is repeatedly performed up to the fully closed position A. That is, by performing the fail-safe function only in the area where the safety control operation is required, the function becomes more convenient.
[0051]
Note that the present invention is not limited to the embodiment. For example, the speed detector 33 detects a change (relative speed) of the rotation speed of the motor by detecting the front-back ratio of the interval time of the pulse signal from the pulse generator 24, and the pinch detector 35 detects The relative speed of the motor 25 detected in the step (b) may be compared with a predetermined value, and when the relative speed is equal to or less than the predetermined value, the trapping of foreign matter may be detected.
[0052]
Also, instead of providing the speed detection unit 33, a reference time determination unit is provided, and this reference time determination unit determines whether an edge of the pulse signal from the pulse generator 24 is detected within the reference time, and detects entrapment. The unit 35 may detect entrapment of a foreign object when the edge of the pulse signal from the pulse generator 24 is not detected within the reference time.
[0053]
【The invention's effect】
According to the present invention, when the counted number of times of pinching reaches the predetermined number of times of pinching, it is determined that the position detection switch has failed, the window glass is brought down, stopped at the fully open position, and the window glass stopped at the fully open position. after when the window glass is up from the fully opened position, area not required safety control operation to a predetermined position of a predetermined length below the fully closed position of the window glass from the fully open position causes the up continuously, the fully closed position from the predetermined position fully closed region from the vicinity of the safety control operation required space and the fully closed position to the vicinity to the fully closed position is performed repeatedly up output stop processing for stopping by up window glass by a predetermined amount.
[0054]
In this way, when the position detection switch fails, the failure is detected, and further, the position of the window glass is detected, and the safety control operation is not required so much from the fully open position to the predetermined position below the fully closed position by a predetermined length . In the region, the window glass is continuously raised, and in a region above a predetermined position where the safety control operation is required, the up output stop process of gradually raising and stopping the window glass is repeatedly performed until the fully closed position. That is, by performing the fail-safe function only in the area where the safety control operation is required, the function becomes more convenient.
[Brief description of the drawings]
FIG. 1 is a schematic configuration block diagram of a power window device with a safety device according to an embodiment of the present invention.
FIG. 2 is a detailed configuration block diagram of a power window device with a safety device according to the embodiment of the present invention.
FIG. 3 is a diagram for explaining a fail-safe function when a limit switch fails.
FIG. 4 is a flowchart showing processing of the power window device with a safety device according to the embodiment.
[Explanation of symbols]
7 Window glass 8 Limit switch 11 Up switch 13 Down switch 15 Auto up switch 17 Auto down switch 21 Microcomputer 24 Pulse generator 25 Motor 31 Safety control area judgment unit 33 Speed detection unit 35 Pinching detection unit 37 Safety control operation command unit 39 Operation command section 41 Driver 43 Pinching counter 45 Failure determination section 47 Pulse counter 49 Up output control section

Claims (1)

The window glass of the vehicle is moved up and down by the drive source, the safety control area of the window glass is determined by a signal from the position detection switch, and a pulse signal having a frequency corresponding to the rotation speed of the drive source is generated by the generation means, and the pulse signal is generated. A power window device with a safety device that performs a safety control operation by detecting entrapment of a foreign object in a safety control region based on the detection device,
When the detection means detects a plurality of pinchings while the wind glass is up, pinching counting means for counting the number of pinchings,
Failure determination means for determining that the position detection switch has failed when the number of times of pinching has reached a predetermined number of times of pinching and lowering the window glass to stop at the fully open position;
When the window glass is window glass after stopping the fully open position is up from the fully opened position, and pulse counting means for counting the number of pulses of the pulse signal of said generating means from the fully open position,
The area where the safety control operation is not required from the fully opened position to the predetermined position below the fully closed position by a predetermined length from the fully opened position based on the counted pulse count value is continuously increased, and the vicinity of the fully closed position from the predetermined position is increased. the safety control operation is fully closed region up to the fully closed position from the vicinity of the area and the fully closed position necessary perform repeat up output stop processing for stopping by up window glass by a predetermined amount up output control means to And a power window device with a safety device.

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