JPH1054175A - Control device of power window regulator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the reliability of the pinch preventing function and prevent the indiscreet reduction of the detection accuracy of the pinched state. SOLUTION: A pulse sensor switch 14 generates a pulse signal Pt each time a window glass is moved by the prescribed quantity and feeds it to a control circuit 1. A vehicle speed sensor 17 feeds the speed pulse Pv indicating the travel speed of a vehicle to the control circuit 1. The control circuit 1 has the normal control function to conduct the opening/closing control of the window glass by a motor 9 in response to the action of a power window switch 3a. When the pulse width of the pulse signal Pt is increased to the threshold value set in advance or above during the movement of the window glass in the closing direction, the control circuit 1 judges it as the pinching state of 7 foreign matter, and it reverses the moving direction of the window glass. The control circuit 1 changes the threshold value to a higher value as the travel speed of the vehicle indicated by the speed pulse Pv is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for a power window regulator for a vehicle in which an opening / closing body such as a window glass or a sunroof in a vehicle is reciprocated according to forward / reverse rotation of a motor.

[0002]

2. Description of the Related Art For example, in a power window regulator for opening and closing a window glass of an automobile, when a window glass is moved in a closing direction in response to driving of a motor, a finger is placed between the window glass and a window frame. When a foreign substance such as the like is trapped, a function of detecting the trapping and automatically reversing the moving direction of the window glass is provided.

In order to realize such an anti-jamming function, conventionally, for example, a signal generating means for generating a number of pulse signals corresponding to, for example, a rotation speed of a motor (that is, a pulse signal indicating a moving amount of a window glass), When the pulse width of the pulse signal has increased by a predetermined threshold or more during a period in which the window glass is outside the inversion inhibition region set immediately before the fully closed position (for example, the pulse width of the pulse signal The pinch detection means for outputting a pinch detection signal is provided when the average pulse width increases to the value obtained by adding the above threshold value to the average pulse width up to and the motor is rotated in reverse by the pinch detection signal to reverse the moving direction of the window glass. It has been done to make it a configuration to make it.

[0004]

Generally, when a running vehicle rides on a protrusion or passes over a step, the pulse width of the pulse signal is reduced due to the inertia acting on the window glass. There are circumstances that fluctuate. Specifically, for example, when the vehicle rides on the protruding portion, at the time of the ride, an upward acceleration is applied to the window glass, and a downward inertial force acts on the window glass, so that the moving speed is reduced. When the pulse width of the pulse signal increases, a downward acceleration is applied to the window glass when returning from the riding state, and an upward inertial force acts on the window glass. The pulse width becomes smaller.

However, when the pulse width of the pulse signal fluctuates greatly due to the influence of the inertial force acting on the window glass as described above, the pulse width may be increased by more than the above-described threshold. In such a case, an entrapment detection signal is erroneously output from the entrapment detection unit, and the direction of movement of the window glass may be unnecessarily reversed. As a result, the reliability of the entrapment prevention function is sufficiently improved. There was a problem that it became difficult.

In order to cope with such a problem, if the threshold level is uniformly increased to provide a large margin for judging the foreign substance entrapment state, the detection accuracy of the foreign substance entrapment state is uncertain. This raises a new problem of decline.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to remove foreign matter by the opening / closing body based on the period or pulse width of a pulse signal indicating the amount of movement of the opening / closing body driven by a motor. Control of a vehicle power window regulator that can improve the reliability of the anti-jamming function and prevent the inadvertent reduction in the accuracy of detecting the jamming state, while having the function of preventing the jamming state. It is to provide a device.

[0008]

In order to achieve the above object, the present invention provides a signal generating means for generating a pulse signal every time an opening / closing body driven by a motor is moved by a predetermined amount; A pinch detection unit that outputs a pinch detection signal when an output cycle or a pulse width of the pulse signal from the signal generation unit increases by a predetermined threshold value or more in a state other than the predetermined inversion inhibition area. The vehicle power window regulator control device further includes a vehicle speed sensor that detects a running speed of the vehicle, and sets the entrapment detection unit to a higher value as the detection speed of the vehicle speed sensor increases. (Claim 1).

According to this structure, the output cycle and pulse width of the pulse signal output from the signal generating means increase as the moving speed of the opening / closing body decreases.
Therefore, the moving speed of the opening / closing body can be known based on the output cycle or the pulse width. The entrapment detection means,
When the output cycle or pulse width of the pulse signal increases by a predetermined threshold value or more, that is, when the moving speed of the opening / closing member becomes slower than a level corresponding to the threshold value, foreign matter is caught. The pinch detection signal shown in FIG.

In this case, when the running vehicle rides on the projection or passes over the step, the movement speed of the opening / closing body is temporarily reduced due to the influence of inertia acting on the opening / closing body. The output cycle and pulse width of the pulse signal may be longer than in the steady state, and the fluctuation amount becomes larger as the traveling speed of the vehicle increases. For this reason, when the running vehicle rides on the protrusion or passes through the step, the output cycle or pulse width of the pulse signal may increase by more than the threshold value. , The pinch detection signal is erroneously output.

However, the entrapment detecting means operates when the vehicle traveling speed detected by the vehicle speed sensor is high, that is, when the output cycle and pulse width of the pulse signal may expand irrespective of the entrapment of foreign matter. As the threshold value increases, the threshold value is changed to a higher value. For this reason, when a phenomenon occurs in which the output cycle and the pulse width of the pulse signal are expanded from the steady state as the traveling vehicle rides on the protrusion or passes through the step, the entrapment detection signal Is not erroneously output, and as a result, the reliability of the anti-jamming function can be improved. When the traveling speed of the vehicle is low, the threshold value is relatively low, so that the detection accuracy of the entrapment state does not drop unnecessarily.

In addition, the pinch detection means is provided with a function of calculating an average output cycle or an average pulse width of the pulse signal, and changing the threshold value to a higher value as the calculation result is larger. (Claim 2).

According to this configuration, as the average output period or the average pulse width of the pulse signal increases, in other words, the amount by which the output period and the pulse width of the pulse signal fluctuate according to the pinching of the foreign matter. As the threshold value increases, the threshold value is automatically increased. Therefore, it is possible to absorb a change in the detection timing of the pinching state due to the difference in the average output period or the average pulse width of the pulse signal.

[0014] In the case of such a configuration, the entrapment detecting means is configured to detect the threshold based on the speed detected by the vehicle speed sensor when the average output cycle or the average pulse width of the pulse signal is equal to or more than a predetermined level. A configuration may be adopted in which the value changing function is invalidated.

In general, when the average output cycle and average pulse width of the pulse signal are equal to or higher than a predetermined level, the opening / closing member moves as the running vehicle rides on the protrusion or passes through the step. Even when the speed is temporarily reduced, the output cycle of the pulse signal and the amount of fluctuation in the pulse width are relatively small, and therefore, the threshold value is changed based on the running speed of the vehicle. Disabling the function will not hinder the function. Therefore, the above claim 3
According to the configuration described above, the threshold value is not unnecessarily increased in a state where the average output cycle and average pulse width of the pulse signal are equal to or more than the predetermined level (the state where the moving speed of the opening / closing member is relatively slow). This eliminates the possibility that the detection accuracy of the pinched state is reduced unnecessarily.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 showing the entire electrical configuration, a control circuit 1 having a function of pinching detection means referred to in the present invention includes a CPU, and is supplied with power from a battery via a constant voltage power supply circuit 2. Configuration. The switch input circuit 3 supplies operation signals from a power window switch 3a, an ignition switch 3b, a courtesy switch 3c, and the like having a well-known configuration to the control circuit 1.

The control circuit 1 is connected to an oscillation circuit 4 for a clock signal and a watchdog circuit 5 for monitoring the output voltage of the constant voltage power supply circuit 2. In particular, the watchdog circuit 5 is connected to a constant voltage power supply. The circuit 2 has a function of resetting the CPU when the output voltage of the circuit 2 falls below the guaranteed operation voltage of the CPU, and a well-known watchdog timer function of resetting the CPU when the CPU runs out of control.

The first relay 6 and the second relay 7 are connected to respective forward and reverse current paths of a motor 9 of a power window regulator 8 provided in a vehicle door through relay switches 6a and 7a respectively provided. They are connected so that they can be formed selectively. Specifically, when the normally open contact (ca) of the relay switch 6a is turned on, the contact (ca) of the relay switch 7a from the power supply terminal + B connected to the battery to the contact (ca). When the motor 9 is energized in the forward direction (the direction of arrow A in the figure) through the interval c-b) and the normally open contact (ca) of the relay switch 7a is turned on, the power supply terminal + B is connected to the relay switch 7a. Contact (c-
During the period a), the motor 9 is energized in the reverse direction via the contact (c-b) of the relay switch 6a.

The relay drive circuit 10 responds to a command from the control circuit 1 by means of the exciting coil 6b of the first relay 6 and the second
For energizing one of the exciting coils 7b of the relay 7 of FIG. The excitation coils 6b and 7b are connected to diodes 11 and 12 for absorbing spike voltage, respectively.

The power window regulator 8
In this case, the window glass as the opening / closing body is moved in the closing direction (upward) while the motor 9 is energized in the forward direction, and the window glass is opened while the motor 9 is energized in the reverse direction. It is configured to move in the direction (downward).

The power window regulator 8 includes a limit switch 13 that is turned off when the window glass is moved to the reversal prohibition region, and a pulse sensor switch that generates a pulse signal Pt every time the window glass is moved by a predetermined amount. 14 (corresponding to signal generation means in the present invention)
Are provided. As is well known, the reversal prohibition region is a region for disabling the anti-jamming function, and is about several mm (for example, 4 mm) from the fully closed position of the window glass.
mm) It is set in the range up to the position in front.

The limit switch input circuit 15 supplies a voltage signal indicating the on / off state of the limit switch 13 to the control circuit 1. The pulse sensor switch input circuit 16 supplies the control circuit 1 with a pulse signal Pt generated according to the on / off state of the pulse sensor switch 13.

A vehicle speed sensor 17 provided to detect the running speed of the vehicle generates a speed pulse Pv having a frequency proportional to the running speed of the vehicle and supplies the generated speed pulse Pv to the control circuit 1.

The contents of control by the control circuit 1 will be described below. In other words, the control circuit 1 transmits the signal indicating the ON state of the ignition switch 3b and the signal indicating the OFF state of the courtesy switch 3c (the state in which the vehicle door is closed) through the relay drive circuit 10 in a state where the signal is input. A state in which the operation of the power window regulator 8 can be controlled is exhibited. In this state, when a command to move the window glass in the closing direction in accordance with the operation of the power window switch 3a is given through the switch input circuit 3, the exciting coil 6b of the first relay 6 via the relay drive circuit 10 , A forward current path of the motor 8 is formed, thereby moving the window glass in the closing direction. When a command to move the window glass in the opening direction is given through the switch input circuit 3, the motor 8 is energized by energizing the exciting coil 7 b of the second relay 7 via the relay drive circuit 10.
Is formed, thereby moving the window glass in the opening direction.

In particular, when each of the above-mentioned movement commands is a well-known auto mode movement command, even after the movement command disappears in response to the release of the operation of the power window switch 3a, the excitation coil 6b or the 7b is kept as it is, and the window glass is continuously moved. When the window glass subsequently reaches the fully open position or the fully closed position, the lock state of the motor 9 accompanying this is changed to, for example, the pulse sensor switch 14. Is determined based on the pulse signal Pt from the controller to release the energized state.

FIG. 2 shows a control routine for the anti-jamming function, which is directly related to the gist of the present invention, out of the control contents of the control circuit 1. This routine is executed in a state in which the window glass is moved in the closing direction (a state in which the exciting coil 6b of the first relay 6 is energized to form a forward energizing path of the motor). ,
First, based on the voltage signal from the limit switch 13, it is determined whether or not the window glass is in the reversal prohibition area (step S1). If the window glass is in the reversal prohibition region, the process returns as it is. If the window glass is out of the determination prohibition region, the average pulse width WPa of the pulse signal Pt from the pulse sensor switch 14 is calculated (step S2).

Next, it is determined whether or not the pulse width WPx of the currently input pulse signal Pt has become larger than the average pulse width WPa (step S3). Where WPx
If the condition is ≤ WPa, return is made.
In the case of x> WPa, that is, the current moving speed of the window glass (indicated by the pulse width WPx of the pulse signal Pt) is lower than the average moving speed (indicated by the average pulse width WPa). If
Steps S41 to S4n-1 for determining the running speed V of the vehicle based on the speed pulse Pv from the vehicle speed sensor 17.
Execute

In steps S41 to S4n-1, the traveling speed V of the vehicle is determined in n stages. More specifically, in each of steps S41 to S4n-1, it is determined whether or not the traveling speed V is equal to or less than a preset reference speed v1, v2, v3,... <V2 <v3
.., <Vn-1), and in each case determined to be "YES", the threshold value calculation steps S51 to S5n-1 are executed, respectively, and when determined to be "NO" in step S4n-1, the traveling speed is determined. If V exceeds the reference speed vn-1,
A threshold value calculating step S5n is executed.

Each of the threshold value calculation steps S51 to S5
n, the traveling speed V of the vehicle determined according to the execution of S41 to S4n-1 and the average pulse width W of the pulse signal Pt.
Based on Pa, threshold values PS1 to PSn for performing entrapment determination are calculated, respectively.

As shown in Table 1 below, the threshold values PS1 to PSn are, for example, three stages (less than 5 ms, 5 stages).
ms or more and less than 20 ms, or 20 ms or more), and is determined according to the average pulse width WPa classified into levels, and increases as the average pulse width WPa increases.
Further, it is set so as to increase as the traveling speed V increases. In Table 1, A is a constant, B and C are predetermined coefficients, and these are A <B · WPa <C · WPa
It is set so that it may become. Α2, α3
... Αn are values obtained by multiplying the sum of the average pulse width WPa and a predetermined constant by a coefficient proportional to the running speed V of the vehicle.

[0031]

[Table 1]

FIG. 3 shows an example of the threshold levels calculated as described above based on the running speed V of the vehicle and the average pulse width WPa for PS1 and PSn. As can be understood from FIG.
The level of PSn is higher when the average pulse width WPa is larger (when the average moving speed of the window glass is higher), and is higher when the running speed V of the vehicle is higher in the entire area.

Turning to FIG. 2, threshold value calculating step S5
After executing any one of 1 to S5n, the process returns after executing the entrapment determination processing step S6. In this step S6, the pulse width WPx of the currently input pulse signal Pt is calculated by executing one of the threshold value calculation steps S51 to S5n with respect to the average pulse width WPa. (Any of PS1 to PSn)
In the case where the number has increased as described above, it is determined that a foreign object is sandwiched between the window glass and the window frame (weather strip).
, The energization path of the motor 9 is switched from the forward direction to the reverse direction, and the moving direction of the window glass is reversed to the opening direction.

As described above, when the window glass is moved in the closing direction and a foreign object is sandwiched between the window glass and the window frame, the moving direction of the window glass is automatically changed. An inversion prevention function of inversion is obtained.

In this case, it is determined whether or not a foreign object has been caught by determining whether the pulse width WPx of the pulse signal Pt output every time the window glass is moved by a predetermined amount is compared with the average pulse width WPa up to that time. The determination is made based on whether or not the vehicle speed has increased by more than a set threshold value.
Is large, that is, the pulse width W of the pulse signal Pt
In this configuration, Px is changed to a higher value in a state where there is a possibility that Px may expand irrespective of the state of foreign matter being pinched.

For this reason, the moving speed of the window glass is temporarily reduced due to the effect of inertia acting on the window glass as the running vehicle rides on the protrusion or passes through the step. Even in a situation where the pulse width WPx of the pulse signal Pt becomes wider than in a normal state, the anti-jamming function does not work erroneously, so that the reliability of the anti-jamming function can be improved. Become. Further, when the traveling speed of the vehicle is low (in general, when it is considered that foreign matter is likely to be trapped), the threshold value is relatively low, so that the detection accuracy of the trapped state is low. There is no danger of dropping unnecessarily.

Further, the average pulse width W of the pulse signal Pt
Since the threshold value is automatically increased as Pa increases, that is, as the fluctuation width of the pulse width WPx accompanying the foreign substance is increased, the threshold is automatically increased. The detection timing does not fluctuate due to the difference in the average pulse width WPa of the pulse signal Pt, and as a result, the detected load (the load acting on the motor 9 just before the window glass is automatically inverted) is constant. Become like

In the case where the threshold value is automatically increased as the average pulse width WPa of the pulse signal Pt increases as described above, the average pulse width WPa of the pulse signal Pt becomes a predetermined level. In the above state, the function of changing the threshold based on the running speed V of the vehicle may be invalidated.

FIG. 4 and Table 2 show examples of setting threshold values according to another embodiment of the present invention employing the above-described configuration. That is, Table 2 shows the threshold value calculation step S5
5 is a table showing an example of calculating threshold values PS1 to PSn in 1 to S5n (see FIG. 2), wherein the average pulse width WPa is 2;
In a state where there is 0 ms or more, a value (C · WPa) irrelevant to the running speed V of the vehicle is selected as the threshold values PS1 to PSn. FIG. 4 shows an example of the threshold levels thus obtained for PS1 and PSn.

[0040]

[Table 2]

By the way, when the average pulse width WPa of the pulse signal Pt is equal to or more than a predetermined level, the moving speed of the window glass is temporarily increased as the running vehicle climbs over the protrusion or passes through the step. , The pulse width WP of the pulse signal Pt due to the influence
Since the variation amount of x becomes relatively small, there is no problem even if the function of changing the threshold value based on the traveling speed V of the vehicle is invalidated.

Therefore, according to the configuration of this embodiment, the threshold value is unnecessarily increased when the average pulse width WPa of the pulse signal Pt is equal to or more than the predetermined level (when the moving speed of the window glass is relatively low). As a result, there is no possibility that the detection accuracy of the entrapment state is reduced unnecessarily.

The present invention is not limited to the above-described embodiment, but can be expanded or modified as described below. The configuration is such that the entrapment detection is performed based on the pulse width WPx of the pulse signal Pt increasing by a predetermined threshold value or more, but when the output cycle of the pulse signal Pt is relatively high, Alternatively, the pinch detection may be performed based on an increase in the average output cycle of the pulse signal Pt by a predetermined threshold value or more. The opening / closing body is a concept including a sunroof for a vehicle and the like.

[0044]

As is apparent from the above description, according to the control apparatus for a vehicle power window regulator according to the present invention, the output period or pulse width of the pulse signal indicating the moving amount of the opening / closing body driven by the motor is used. However, when the pinching detection is performed when the threshold value increases by a predetermined threshold value or more, the threshold value is changed to a higher value when the running speed of the vehicle is higher. This has a beneficial effect that the reliability of the prevention function can be improved, and that the inaccurate decrease in the detection accuracy of the entrapment state can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall electrical configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a main part of control contents by a control circuit;

FIG. 3 is a diagram illustrating an example of a calculated threshold value;

FIG. 4 is a view corresponding to FIG. 3, showing another embodiment of the present invention.

[Explanation of symbols]

1 is a control circuit (trapping detection means), 8 is a power window regulator, 9 is a motor, 10 is a relay drive circuit,
13 is a limit switch, 14 is a pulse sensor switch (signal generating means), and 17 is a vehicle speed sensor.

Claims (3)

[Claims] 1. A signal generating means for generating a pulse signal each time an opening / closing body driven by a motor is moved by a predetermined amount, and wherein said signal generating means is in a state where said opening / closing body is outside a predetermined inversion inhibition area. And a pinch detection means for outputting a pinch detection signal when the output period or pulse width of the pulse signal from the controller increases by a predetermined threshold value or more. A control device for a power window regulator for a vehicle, comprising: a vehicle speed sensor that detects the vehicle speed; and wherein the entrapment detection unit changes the threshold value to a higher value as the speed detected by the vehicle speed sensor increases. 2. The method according to claim 1, wherein the entrapment detecting means calculates an average output cycle or an average pulse width of the pulse signal, and changes the threshold value to a higher value as the result of the calculation is larger. Item 2. A control device for a power window regulator for a vehicle according to Item 1. 3. The pinch detection means invalidates a function of changing the threshold value based on a speed detected by the vehicle speed sensor when an average output cycle or an average pulse width of the pulse signal is equal to or more than a predetermined level. 3. The control device for a vehicle power window regulator according to claim 2, wherein the control device is configured as follows.