JP3578568B2 - Power window control device for vehicles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicular power window control device having an anti-jamming function, and more particularly to an improved anti-jamming function for appropriately handling a load increase other than the jamming.
[0002]
[Prior art]
2. Description of the Related Art As is well known, in a power window mechanism installed for a vehicle such as an automobile, a switch mechanism for opening and closing control of a window installed in a vehicle compartment is operated to supply a motor for driving the window. It is configured to switch the direction of the rotation drive current.
[0003]
However, in such a power window mechanism, when the window is closed, foreign matter, for example, a part of a human body, may be pinched. Therefore, as a pinching prevention function, fluctuations in the rotation speed of the motor driving the window are monitored. Or, by monitoring the change in the motor drive current, when the rotation speed of the motor or the drive current of the motor changes beyond a specified threshold value, it is assumed that the load has increased and that the Is determined.
[0004]
Then, when it is determined that such a pinch is caused by the window, the rotation direction of the motor that drives the window is reversed to release the pinched state of the foreign object by the window.
[0005]
In such a power window control device, when a large load acts on the operation of the window due to, for example, freezing of the window, the window is not operated even though the window is caught by any foreign matter. There is a high possibility that it will be determined that the foreign matter is caught.
[0006]
For this reason, conventionally, when a load other than pinching by a window occurs, a countermeasure for the window drive motor to be unable to be closed because the motor for window drive is reversely driven at that point is that if the motor is continuously reversed, then the window A power window control device has been conceived in which, even if the switch for raising the window is kept depressed, the window is driven to move upward in the closing direction for a predetermined time or a predetermined distance and then stopped even if the switch for raising the window is kept pressed.
[0007]
[Problems to be solved by the invention]
However, in such a conventional power window control device, when a load increase other than pinching by the window occurs, it is necessary to repeat the same closing operation many times in order to fully close the window. There is a problem that the operation is complicated.
[0008]
Therefore, the present invention has been made in view of the above points, and has an anti-jamming function in which a motor for driving a window is inverted and stopped by detecting the jaw by the window during the operation of closing the window. In the vehicle power window control device, when a load increase other than pinching due to the window occurs, the pinch detection can be performed while the window can be driven to the fully closed position by passing through the load increase point and closed. It is an object of the present invention to provide a vehicle power window control device.
[0009]
[Means for Solving the Problems]
In the power window control device for a vehicle according to claim 1, the opening / closing control means gives a command for driving the window in the opening direction or the closing direction based on a command from the switch mechanism, to the window control motor.
[0010]
The pinch detection means detects pinch by the window.
The stopping means stops the motor when the pinching by the window is detected.
[0011]
When the pinch detection by the window and the stop of the motor are continuously performed a predetermined number of times, the pinch detection is performed by the pinch detection unit at a location where the pinch detection is continuously performed a predetermined number of times during the subsequent closing operation of the window. By performing the process of prohibiting the detection of entrapment and passing the load increasing portion at the time of the closing operation again, the window closing operation can be performed to the fully closed position.
[0012]
That is, according to the power window control device for a vehicle according to the first aspect, during the closing operation of the window due to, for example, freezing or the like, the load acting on the window driving motor is abruptly changed so that the load acting on the window driving motor increases. In such a case, the window closing operation can be performed to the fully closed position by a simple operation by executing the process of passing the load increasing portion by the closing operation again. The problem that the window cannot be closed in the situation is solved.
[0013]
According to a third aspect of the present invention, in a power window control device for a vehicle having a pinching prevention function of stopping the motor from reversing when a motor load increase is detected while the window is rising, the load increase other than the pinching caused by the window is reduced. If this occurs, the start mask processing (unstable immediately after the motor is started) must be performed instead of detecting the entrapment state by the window, as in the past, in order to prevent the entrapment from closing due to an increase in load other than entrapment. The window is closed by using the same mask processing as in the processing in which the load variation is not detected only in the area).
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a power window system mounted on a vehicle, and includes a control circuit 11 including, for example, a microcomputer (CPU).
[0015]
The control circuit 11 controls the entire power window system and, together with the components described below, constitutes a vehicle power window control device as defined in the claims of the present invention.
[0016]
More specifically, this control circuit 11 includes a separate operation of a window up (UP) command switch 12 and a window down (DOWN) command switch 13 installed in the vehicle interior, or an automatic (AUTO) command switch 18 and The operation command signal by the combination operation of is input.
[0017]
A switching drive command is supplied from the control circuit 11 to the first relay switch 14 on the UP side and the second relay switch 15 on the DOWN side via the buffer amplifiers A1 and A2, respectively.
[0018]
The first and second relay switches 14 and 15 constitute a power supply circuit of a motor 16 for driving a power window.
Here, in a state where the respective contacts (ON, OFF) of the first and second relay switches 14 and 15 are set to the states shown in the figure, the + B power supply is applied to one end of the motor 16 via the first relay switch 14. , And the other end of the motor 16 is connected to the ground circuit via the second relay switch 15, so that the motor 16 is driven to rotate in the upward (UP) direction.
[0019]
That is, this causes the power window (not shown) to be driven in the closing direction.
When the contacts of the first and second relay switches 14 and 15 are switched from the illustrated state to the opposite sides by a command from the control circuit 11, the polarity of the power supplied to the motor 16 is inverted. Therefore, the motor 16 is driven to rotate in the opposite direction, that is, the downward (DOWN) direction.
[0020]
That is, the power window (not shown) is thereby driven in the opening direction.
The motor 16 is provided with a rotation detection circuit 17 configured using, for example, a Hall element (Hall IC). The rotation detection circuit 17 outputs a pulse having a cycle corresponding to the rotation speed of the motor 16. A signal is generated.
[0021]
The pulse signal from the rotation detection circuit 18 is input to the control circuit 11 and counted, whereby the opening position of the window and the like are detected, and the rotation speed of the motor 16 is calculated based on the cycle of the pulse signal. Will be done.
[0022]
In FIG. 1, the control circuit 11 is connected to a limit switch (SW) 19 for determining an entrapment detection area by a window, which will be described later.
That is, the limit SW 19 includes a dead area R1 (a narrow area where there is no danger of pinching a finger or the like of a human body, usually about several mm) and a detection area R2 (dead area) related to pinch detection by the window 20 as shown in FIG. It is provided near the upper end of the window frame in the vehicle interior to determine the closed area of the window 20 excluding R1).
[0023]
Next, the operation of the power window system configured as described above will be described first from the outline.
Assuming that the window is opened and the UP switch 12 is operated to close the window from this state, the control circuit 11 causes the first and second relay switches 14 and 15 to show the respective contacts. , The motor 16 is supplied with a current in the upward (UP) direction.
[0024]
In this case, the rotation speed of the motor 16 is obtained by the control circuit 11 calculating the period of the pulse signal output from the rotation detection circuit 17 attached to the motor 16.
[0025]
The pinch detection during the window raising operation is realized by the control circuit 11 calculating the absolute value, change amount, change rate, etc. of the cycle of the pulse signal output from the rotation detection circuit 17. Can be.
[0026]
For example, assuming that the period of the pulse signal output from the rotation detecting circuit 17 extends from T1 to T2 as shown in the figure, the control circuit 11 sets (T2−T1) from a predetermined threshold value Tth. If it is larger, it is determined that pinching by the window has occurred.
[0027]
That is, if pinching by the window occurs, the power window system acts as an increase in load, which decreases the rotation speed of the motor 16 and, consequently, the pulse output from the rotation detection circuit 17. This is because the period of the signal becomes long so as to extend from T1 to T2 as shown in the figure.
[0028]
If the control circuit 11 determines that pinching by the window has occurred, the motor 16 and the window are opened by switching the respective contacts of the first and second relay switches 14 and 15 from the illustrated state in the opposite direction. To drive in the descending (DOWN) direction.
[0029]
At this time, the control circuit 11 counts the pulse signal from the rotation detection circuit 17, continues the downward drive until the pulse signal reaches a predetermined number of pulses, and then connects the respective contacts of the first and second relay switches 14 and 15 to each other. By switching to the same polarity, the motor 16 is stopped.
[0030]
In other words, the reason why the window is stopped to be inverted is that if the pinching by the window is, for example, a pinching of a human body, clothes, or the like, it is considered that the stopping of the window immediately releases the pinching.
[0031]
However, in the present embodiment, if the reversal stop operation is repeated a predetermined number of times (N) during the window raising operation by operating the UP switch 12, the control circuit 11 will not be able to perform simple pinching. Instead, it is configured that the load is increased due to some cause (for example, freezing or the like) other than the pinching by the window, and a mask process similar to the activation mask process described below is started.
[0032]
Here, the startup mask process is a process for detecting a pinching by a window to avoid a period in which the rotation speed of the motor is unstable immediately after the startup from the pinching detection by the window.
[0033]
That is, as in the present embodiment, in a power window system having a pinching prevention function of detecting a pinching by a window by using a change in the rotation speed of a motor, in order to prevent erroneous reversal operation due to the pinching prevention function, Until the rotation speed of the motor is stabilized at the time of start-up by the start-up mask processing, the detection of pinching by the window is prohibited.
[0034]
This is because if such a startup mask process is not performed, pinching by a window may be erroneously detected during a period in which the motor rotation speed at startup by operating the UP switch is unstable. This is to prevent the window from being unnecessarily inverted in the descending direction and then stopped.
[0035]
Specifically, if the above-described reversal stop operation is continuously repeated a predetermined number of times (N) during the window ascending operation, the control circuit 11 causes the control circuit 11 to perform any cause other than pinching by the window. (E.g., freezing), and while the UP switch 12 is turned on again to drive the motor 16 in the UP direction, the period of the pulse signal from the rotation detection circuit 17 becomes smaller than the threshold value. When the motor 16 becomes large, the motor 16 is immediately stopped without reversing in the DOWN direction, and the entrapment detection is not performed for a predetermined period thereafter, similarly to the start mask process.
[0036]
Thus, when the UP switch 12 is turned on again, the control circuit 11 does not perform the pinch detection, so that the motor 16 is driven in the UP direction without reversing the motor 16 in the DOWN direction even in the load increase region. To be able to wind down and completely close.
[0037]
Next, details of the operation according to the present embodiment will be described with reference to a flowchart as shown in FIG.
First, the control circuit 11 determines whether or not to raise the window by turning on the UP switch 12 in step 101, and if it is on, sets the relay switch 14 on the UP side to an on state in step 102 ( At this time, the DOWN side relay switch 15 is set to the off state.)
[0038]
Next, the control circuit 11 determines in step 103 whether or not the detection area is the detection area of the pinch detection by the window based on the polarity of the limit SW 19. For example, when the limit SW 19 is the ON polarity “L”, the detection area of the detection by the window is detected. If "L" is input from the limit switch 19, it is determined in step 104 whether or not the motor 16 is stopped by Tst <Tm.
[0039]
Here, Tm is the elapsed time from the input of the latest pulse signal from the rotation detection circuit 17 to the control circuit 11.
Tst is a constant (for example, 500 ms), and is a threshold value for determining that the motor 16 has stopped after a lapse of more than that.
[0040]
If Tm <Tst in step 104, the control circuit 11 determines that the motor 16 has not stopped, proceeds to step 105, and determines whether or not a mask process similar to the start mask process is being performed.
[0041]
At this time, the control circuit 11 compares in step 105 the value Cp obtained by counting the pulse signals from the rotation detection circuit 17 with the activation mask pulse number Cm (constant) in another process by interruption as shown in the flowchart of FIG. I do.
[0042]
Here, the interruption process for the Cp pulse count by the control circuit 11 shown in FIG. 4 will be described.
First, when the UP side relay switch 14 is turned on in step 201, the control circuit 11 initializes Cp = 0 in step 202.
[0043]
Subsequently, the control circuit 11 determines whether or not there is an input of the pulse signal Cp from the rotation detection circuit 17 in step 203, and then, in step 204, counts up and increments Cp in step 205, Continue until stop is determined.
[0044]
The control circuit 11 compares the pulse count value Cp thus obtained with the number of activation mask pulses Cm (constant) in step 105, and counts the pulse count value Cp to be equal to or greater than the activation mask pulse number Cm (normally around 20 pulses). If so, the mask is released (trapping detection starts).
[0045]
Subsequently, when the difference (Tn−Tn−1) between the latest pulse period Tn and the previous pulse period Tn−1 exceeds the threshold value Tth in step 106, the control circuit 11 determines in step 107 that the relay on the UP side The switch 14 is turned off.
[0046]
Subsequently, the control circuit 11 increments the entrapment number counter Cj in Step 108, compares Cj with a predetermined number N (for example, N = 2 to 3) in Step 109, and determines that the entrapment number counter Cj has exceeded the predetermined number N. Then, at step 110, Cj is cleared (110), and a series of processing ends.
[0047]
That is, in this state, although the control circuit 11 detects the entrapment, it considers that the load is increased due to some cause other than the entrapment by the window (for example, freezing or the like), and the motor 16 is not inverted. When the switch 12 is turned on, the motor 16 is driven in the UP direction until the mask pulse comparison (Cm <Cp) described above is established in step 105 and the flow proceeds to step 106 through steps 101 to 104 and step 105. Since the entrapment is continued, it is substantially the same as the case where the entrapment is not detected at the position where the entrapment was detected last time (where the sliding load of the window is large), and the window can be passed therefrom.
[0048]
Thus, it is possible to prevent the window from being unable to be closed at some high load location.
If the entrapment counter Cj is equal to or less than the predetermined number N in Step 109, the control circuit 11 turns on the DOWN side relay switch 15 in Step 114, inverts the motor 16 to lower the window, and in Step 115 After it is determined whether or not the predetermined number of pulses Cd have been counted, in step 116, the DOWN side relay switch 15 is turned off, and a series of processing ends.
[0049]
The pulse count of the predetermined number of pulses Cd can be the same as that for obtaining the pulse count value Cp described above.
In the above, if the UP switch 12 is not turned on in step 101, the control circuit 11 turns off both relay switches 14 and 15 in step 111 and returns to the processing of step 101.
[0050]
If it is determined in step 103 that the motor 16 is in the dead zone, the control circuit 11 determines whether or not the motor 16 is stopped in step 112. If the motor 16 is stopped, the control circuit 11 turns off the UP side relay switch 113 in step 113. Then, a series of processes is terminated, but if the motor 16 is not stopped, the process returns to step 101.
[0051]
If it is determined in step 104 that the motor is stopped, the control circuit 11 jumps to the processing in step 107.
If the comparison in steps 105 and 106 is not satisfied, the control circuit 11 returns to the processing in step 101.
[0052]
In the above-described embodiment, instead of monitoring the fluctuation of the rotation speed of the motor, the means for detecting the entrapment by the window may monitor the change of the drive current of the motor.
[0053]
Also, as the processing of step 105 in FIG. 2, the mask pulses are counted and Cm <Cp? May be provided instead of determining whether the time after the UP switch 12 has been turned on has passed a predetermined time or more, and if it has exceeded the predetermined time, the process may proceed to step 106. .
[0054]
Therefore, according to the present embodiment as described above, by employing the same mask processing as the activation mask processing, it is possible to safely pass the position where the load other than the pinching by the window has increased. In this way, it is possible to avoid a problem that the window cannot be closed even if the load on the motor 16 increases due to, for example, freezing.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram illustrating an embodiment of the present invention.
FIG. 2 is a flowchart for explaining the overall operation of the embodiment of the present invention.
FIG. 3 is a diagram showing a determination area of a limit switch used in the embodiment of the present invention.
FIG. 4 is a flowchart for explaining a part of the operation of the embodiment of the present invention;
[Explanation of symbols]
11 ... control circuit (CPU),
12 UP switch,
13 DOWN switch,
14 ... Relay switch,
15 ... Relay switch,
16 ... motor,
17: rotation detection circuit,
18 ... AUTO switch,
19 ... Limit switch,
A1: Buffer amplifier,
A2: Buffer amplifier,
20 ... Windu.

Claims (7)

A window driving motor for selectively driving the window in the opening direction or the closing direction,
Opening / closing control means for giving a command to drive the window in the opening direction or the closing direction to the motor in response to an input from a switch mechanism that outputs an opening command or a closing command to the window,
At the time of closing the window, a pinch detecting means for detecting pinching by the window by determining an increase in load;
Stopping means for stopping the motor when the entrapment by the window is detected by the entrapment detection means,
When the pinch detection by the pinch detection unit and the stop of the motor by the stop unit are continuously performed a predetermined number of times, the pinch detection unit at a location where the pinch detection is continuously performed a predetermined number of times during the closing operation of the window thereafter A power window control device for a vehicle, comprising: a prohibition unit configured to prohibit the detection of entrapment by the vehicle. The power window control device for a vehicle according to claim 1, wherein the entrapment detection unit includes an area determination unit that determines a detection area for entrapment detection. The prohibiting unit is configured to prevent the entrapment detection unit from detecting a load change for the entrapment detection in an unstable region immediately after the start of the motor, thereby causing the motor to pass through a location where the load increases due to the ascending drive. In addition to executing the activation mask processing to enable the activation mask processing, the entrapment detecting means does not detect the load change for the entrapment detection for a predetermined period at the time of the window closing operation again using the same mask processing as the activation mask processing. The power window control device for a vehicle according to claim 1 , wherein the masking process is performed so that the motor can be passed through a load increase portion by the ascending drive. 3. The power window control device for a vehicle according to claim 1, wherein the prohibition unit prohibits the entrapment detection by the entrapment detection unit for a predetermined time or while the window is driven in a closing direction by a predetermined distance. 4. The method according to any one of claims 1 to 4 , wherein the stopping means includes a reversing means for reversing the motor after the motor is stopped if the number of times of detection of the jamming by the jamming detection means is less than the predetermined number of times. A power window control device for a vehicle according to the above. 6. The apparatus according to claim 1, wherein the entrapment detecting unit determines the load increase based on a change in a cycle of a pulse signal having a cycle corresponding to a rotation speed of the motor. 7 . A power window control device for a vehicle according to the above. The stopping means, when the reversal stop operation of the motor is continuously repeated for a predetermined number of times, at the time when the entrapment is detected by the entrapment detection means, immediately stopping the motor without reversing, 6. The power window control device for a vehicle according to claim 5, wherein the prohibition unit does not perform the entrapment detection by the entrapment detection unit during a predetermined period thereafter.

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