JP3423839B2 - Control device for vehicle power window regulator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power window regulator for reciprocally moving a window glass provided in a vehicle in accordance with forward and reverse rotations of a motor, and more particularly to a vehicle power window having a trapping prevention function. The present invention relates to a control device for a window regulator.

[0002]

2. Description of the Related Art In a recent vehicle power window regulator, when moving a window glass in a closing direction,
A function is provided to prevent a finger or the like from being caught between the window glass and the window frame.

When such a trapping prevention function is provided, a means for detecting the magnitude of the motor load based on the load current flowing in the window regulator motor is provided so that the moving window glass is located just before the fully closed position. When the level of the detection output by the load detecting means becomes equal to or higher than a predetermined threshold value during the period before reaching the set automatic inversion prohibition region, this is recognized as a foreign substance trapped state and the window glass is detected. The moving direction is reversed.

However, in the case where the magnitude of the motor load is simply detected based on the absolute value of the load current, the detection output indicates the power supply voltage due to the deterioration of the vehicle battery over time, the ambient temperature, and the like. Since it fluctuates following changes, it is highly likely that the trapping prevention function will not work properly when it is needed, and vice versa, and its reliability will decrease. Problems arise.

Therefore, in practice, a means for detecting the magnitude of the motor load based on the increment of the load current flowing through the window regulator motor is provided. Specifically, the increment of the load current per unit time is detected by differentiating the load current of the motor, and the magnitude of the motor load is determined by comparing the detection result with a threshold value. Therefore, the entrapment state of the foreign matter is recognized based on the determination result.

[0006]

According to the structure for detecting the magnitude of the motor load based on the increment of the load current as described above, it is possible to detect a change in the power supply voltage due to the deterioration of the on-vehicle battery or the ambient temperature. Is available.

However, in a vehicle, for example, when the starter motor is driven, when the air conditioner blower motor is started, or when the passing light flashes, the power supply voltage temporarily decreases and then rises again. However, the conventional configuration cannot cope with such voltage fluctuation. That is, when the transient power supply voltage variation phenomenon occurs as described above, the increment of the load current per unit time based on the phenomenon may exceed the threshold value. When such a situation occurs,
This is erroneously recognized as a state of entrapment of foreign matter, and the moving direction of the window glass is reversed, resulting in a problem that it is difficult to sufficiently enhance the reliability of the entrapment prevention function.

In order to deal with such a problem, it is conceivable that the threshold setting level is increased to give a sufficient margin for the operation of recognizing the entrapped state of the foreign matter. When a foreign matter is caught in the sheet, a new problem arises that the detection timing is delayed and the detection load (the magnitude of the motor load when the window glass is inverted) increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to detect a situation in which the entrapment prevention function malfunctions due to a temporary fluctuation of a power supply voltage, such as delay in detection timing of the entrapment state or detection. It is an object of the present invention to provide a vehicle power window regulator that can be prevented without increasing the load.

[0010]

In order to achieve the above object, the present invention comprises a motor for reciprocating a window glass, and a current detecting means for detecting a load current flowing through the motor. When the window glass moves in the closing direction, the window glass moves when the increment of the load current per unit time exceeds a preset threshold value before the window reaches the closed position. In a control device for a vehicle power window regulator in which the direction is reversed, voltage detection means for detecting the power supply voltage of the motor, and a state in which the detection voltage by the voltage detection means is reduced by a preset voltage width or more When switching to the correction operation mode when
A correction means for adding a preset current correction value to the threshold when the rising tendency of the detected voltage above a certain level is extracted is provided (claim 1).

According to this structure, when the window glass is moved in the closing direction and a foreign object is caught between the window glass and the window frame, the motor is locked according to the current. Since the increment of the load current detected by the detecting means per unit time exceeds the threshold value,
The trapping prevention function that the moving direction of the window glass is automatically reversed comes to work.

The power supply voltage of the motor is monitored by a voltage detecting means provided to detect this. In such a monitoring state, when a temporary fluctuation phenomenon occurs in which the power supply voltage once drops and then rises again, the decrease width of the voltage detected by the voltage detection means is equal to or larger than the voltage width set in the correction means. If so, the correction means is switched to the correction operation mode. The correction means adds the preset current correction value to the threshold value when the rising tendency of the voltage detected by the voltage detection means above a certain level is extracted in the state of switching to the correction operation mode. Become.

Therefore, when the transient power supply voltage fluctuation phenomenon as described above occurs, the threshold value is constantly changed to a larger value. It becomes possible to prevent the situation where the increment of the load current exceeds the above threshold value. As a result, unlike the conventional configuration, when a transient power supply voltage variation phenomenon occurs, it is not erroneously recognized as a foreign substance trapped state and the direction of movement of the window glass is not reversed unnecessarily.

[0014]

[0015]

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a power window regulator for opening and closing a window glass of an automobile will be described below with reference to the drawings. FIG. 1 shows the entire electrical configuration. In FIG. 1, a DC motor 1 is for reciprocating a window glass provided on, for example, an automobile door through a window regulator (none of which is shown), and includes a drive circuit 2 and a shunt resistor 3 from a power supply terminal + B. It is configured to be energized via (corresponding to the current detection means in the present invention). The motor 1 moves the window glass in the closing direction (upward direction) when energized in the forward direction, and moves the window glass in the opening direction (downward direction) when energized in the reverse direction. The power supply terminal + B is connected to an on-vehicle battery via a power supply relay switch (none of which is shown), and the power supply relay switch is in a state where the engine key switch of the automobile is in the ON position. It is configured to be turned on.

Although not specifically shown, the drive circuit 2 is, for example, a combination of two relays, and has a command from an output port Q1 of a control circuit 4 (corresponding to the correcting means in the present invention) described later. A forward-direction energization path and a reverse-direction energization path for the motor 1 can be selectively formed according to a signal.

The shunt resistor 3 is for detecting a load current flowing through the motor 1. The terminal voltage of the shunt resistor 3 is amplified by the amplifier 5 and then the voltage of a level proportional to the load current flowing through the motor 1. The signal Vd is supplied to the input port P1 of the control circuit 4.

The limit switch 6 is configured to turn on when the window glass is moved to the automatic reversal prohibition area set immediately before the closing position thereof, and its on signal is input to the input port of the control circuit 4. It is given to P5. As is well known, the automatic reversal prohibition region is a region for invalidating the pinch prevention function, and is set at a position several millimeters before the fully closed position of the window glass.

Up switch 7 and down switch 8
Is for instructing a closing (up) operation and an opening (down) operation of the window glass, and is adapted to give each ON signal to the input ports P3 and P4 of the control circuit 4.

A-corresponding to the voltage detecting means in the present invention
The D conversion circuit 10 outputs the output voltage of the power supply terminal + B (motor 1
Power source voltage) is received through the diode 9, and the converted output is applied to the input port P2 of the control circuit 4 as the voltage signal Vs indicating the level of the power source voltage of the motor 1.

The control circuit 4 is mainly composed of a microcomputer, and is adapted to be fed from the power supply terminal + B through the diode 9 and the constant voltage power supply circuit 11. The control circuit 4 is provided with an oscillator 12 for a clock signal and a power supply monitoring circuit 13 that monitors the output voltage of the constant voltage power supply circuit 11, and in particular, the power supply monitoring circuit 13 is When the output voltage of the constant voltage power supply circuit 11 falls below the operation guarantee voltage of the microcomputer constituting the control circuit 4, the control circuit 4 is reset.

The control circuit 4 controls the movement of the window glass by selectively forming the forward and reverse energization paths of the motor 1 based on the ON signals from the up switch 7 and the down switch 8. In particular, when moving the window glass in the closing direction, when foreign matter such as fingers is caught between the window glass and the window frame (weather strip), that state Is detected to reverse the moving direction of the window glass, and the control is performed to realize the trapping prevention function.

The trapping prevention function is basically based on the voltage signal Vd given through the amplifier 5 in the state where the forward-direction energization path of the motor 1 is formed (the window glass is moved in the closing direction). Sequentially detects the increment (differential value) of the load current flowing through the motor 1 and the thus detected increment of the load current exceeds a preset threshold value Is. Motor 1
It is realized by forming a reverse-direction electric conduction path and reversing the moving direction of the window glass. However,
Such a trapping prevention function is disabled when the window glass is in the automatic inversion prohibition region defined by the limit switch 6.

The present embodiment is characterized in that the threshold value Is for the trapping prevention function as described above is corrected according to the fluctuation state of the power supply voltage. The control contents for Is correction and the related actions will be described with reference to FIGS. 2 and 3 showing the control contents and FIG. 4 showing an example of the change state of the power supply voltage.

That is, FIG. 2 and FIG. 3 show the contents of the “threshold setting” routine for correcting the threshold value Is among the control contents of the control circuit 4. Also, FIG.
4 shows an example of a change state of the power supply voltage when the engine starter motor of the automobile is driven (during cranking) and an example of the level of the current correction value used for correcting the threshold value Is.

The above-mentioned "threshold setting" routine is incorporated in the main program. In this routine, as shown in FIG. 2, first, as shown in FIG. Judgment is made based on the output content of the command signal from Q1 (S101).

If the window glass is not rising, step S102 of resetting the drop detection flag KF and the correction value holding flag HF to "0" is executed and the process returns to the main program. The drop detection flag KF and the correction value holding flag HF are configured to be reset to "0" together with a retry flag RTF, which will be described later, at the time of initialization processing after power-on in response to turning on of the engine key switch.

On the other hand, when the window glass is rising, it is determined whether the drop detection flag KF is "1" (S103). In this case, in the initial state after the power is turned on, the drop detection flag KF is reset to "0". Therefore, when the "threshold setting" routine is first executed after the power is turned on, "N" is given in step S103.
When it is determined in this way, step S104 for calculating the variation amount ΔV of the power supply voltage (hereinafter, referred to as a sampling voltage) indicated by the voltage signal Vs is executed.

In step S104, the latest sampling voltage V is changed to the previous sampling voltage V '(hereinafter,
The voltage change amount ΔV in the unit time α (one sampling cycle) is calculated by performing a calculation of subtracting a reference sampling voltage as necessary. However, in the initialization process after the power is turned on, for example, 0 V is set as the initial value of the reference sampling voltage V ′, and at the initial execution of step S104, this initial value is the voltage change amount in step S104. It is used to calculate ΔV.

After calculating the voltage change amount ΔV as described above, whether or not the relation ΔV> 0 is satisfied, that is, the latest sampling voltage V is higher than the reference sampling voltage V ′ (previous sampling voltage). It is determined whether or not (S105). When it is determined to be "YES" (when the sampling voltage is increasing), the process proceeds to the determination step S132 shown in FIG. 3, but when it is determined to be "NO", ΔV (= V-V ′) ≦ −Va is satisfied, that is, it is determined whether the latest sampling voltage V is lower than the reference sampling voltage V ′ by a certain voltage width Va or more (S106).

Since 0V is set as the reference sampling voltage V'in the initial state, when the "threshold setting" routine is first executed after the power is turned on, the relationship of ΔV> 0 is established. Therefore, it is determined "YES" in step S105, and the determination step S132 is executed.

In the judgment step S132 shown in FIG. 3, it is judged whether or not the retry flag RTF is "0". In this case, in the initial state after the power is turned on, the retry flag R
Since TF has been reset to "0", "YES" is determined in step S132 when the "threshold setting" routine is first executed after power-on, and when such determination is made, The latest sampling voltage V is updated and stored as a new reference sampling voltage V '(S133), after which the process returns to the main program.

Further, in the judgment step S132, "N
When it is determined to be "O", that is, when the retry flag RTF is set to "1", step S133 for updating and storing the new reference sampling voltage V'is jumped and returned as described above.

Therefore, when the retry flag RTF is set to "1", the reference sampling voltage V'is held as it is. Therefore, during the period until the retry flag RTF is reset to “0”, the operation of calculating the voltage change amount ΔV in step S109 is based on the reference sampling voltage V ′ held as described above. Will be done. That is, the sampling interval of the power supply voltage which is the basis of the voltage change amount ΔV is extended by the unit time α.

As will be apparent from the description below,
In the retry flag RTF, the deterioration detection flag KF is "1".
Is set to "1" only in the state (state determined to be "YES" in step S103), the step S1 performed in the state where the decrease detection flag KF is "0".
The calculation operation of the voltage change amount ΔV in 04 is performed based on the previous sampling voltage V ′ sequentially sampled in the cycle of the unit time α.

Even after the new reference sampling voltage V'is stored by executing step S133 as described above, if the latest decrease in the sampling voltage V is smaller than the set voltage width Va, that is, "N" in step S106.
If it is determined to be “O”, the process proceeds to a determination step S132, but if the sampling voltage V decreases by the set voltage width Va or more (“YES” in step S106), the window glass is in the automatic inversion prohibition region. Whether or not it is determined based on the ON signal from the limit switch 6 (S10).
7).

When the window glass is in the automatic inversion prohibition region, the process proceeds to the determination step S132, but in the other states, the process proceeds to the determination step S132 after executing the step S108 for setting the drop detection flag KF to "1". .

In short, as shown in FIG. 4, when the variation amount ΔV of the sampling voltage V (power supply voltage) per unit time α (corresponding to the sampling cycle) becomes -Va or more (timing t1), the window is opened. The drop detection flag KF is set to "1" on the assumption that the glass does not exist in the automatic inversion prohibition region.

When the drop detection flag KF is set in this way, it is judged "YES" in step S103, but in this case as well, the change amount ΔV of the sampling voltage V is calculated. Step S109 is executed.

After execution of step S109, it is determined whether the correction value holding flag HF is "0" (S110).
In this case, since the correction value holding flag HF is reset to "0" during the initialization processing, "YES" is determined in step S110 in the normal state, and thus "YES" is determined. Sometimes
Whether ΔV> 0 is established (whether the latest sampling voltage V has risen above the reference sampling voltage V ′)
Is determined (S111).

If "NO" is determined here, that is,
As shown at timing t2 in FIG. 4, when the latest sampling voltage V is equal to or lower than the previous sampling voltage V ', the process proceeds to the determination step S132. On the other hand, when it is determined to be “YES” in step S111, that is, when the latest sampling voltage V becomes higher than the previous sampling voltage V ′ as shown at timing t3 in FIG. Step S11 for correcting the threshold value Is used for the prevention function based on the voltage change amount ΔV (corresponding to the fluctuation state of the power supply voltage).
2 to S123 are selectively executed.

Here, the above-mentioned correction is performed by the threshold I
It is performed by adding a current correction value of a level corresponding to the increase of the voltage change amount ΔV to s. In the case of this embodiment, the current correction values I1, I2 of four levels,
I3 and I4 (I1 <I2 <I3 <I4) are prepared, and the control circuit 4 corrects the four levels of reference voltage levels L1 to L4 in order to determine the current correction value level as shown in FIG. It is stored as a value data table.

In FIG. 5, each reference voltage level L1
˜L4 are reference voltage values δV11, δV12, ..., δV2 at different levels according to the sampling interval (an integral multiple of the unit time α) that is the basis of the calculation of the voltage change amount ΔV.
1, δV22, ……, δV31, δV32, ……, δV41, δ
V42, ... Are set, and the reference voltage values of the reference voltage levels L1 to L4 are set to become higher as the sampling interval becomes longer as shown in FIG. .

However, in step S112, ΔV ≧
It is determined whether or not the relationship is L1. However, at the time of this determination, the reference voltage values δV11, δV of the reference voltage level L1
Of 12, ..., The data corresponding to the sampling interval which is the basis of the calculation of the voltage change amount ΔV to be determined is read from the data table of FIG. 5 and used, and each of the following determination steps S113, S114, S11
Also in No. 5, the data similarly read from the data table is used.

When it is judged "NO" in the above step S112, the retry flag RTF is set to "1" in step S122, and the timer time TX of the correction time timer is set.
Corresponds to the correction operation end time (for example, 400 ms)
After sequentially executing step S123 of setting max,
The procedure moves to the determination step S124 shown in FIG.

On the other hand, in step S112, "YE
If it is determined to be “S”, it is determined what relationship the voltage change amount ΔV has with the reference voltage levels L2, L3, and L4 (S113, S114, S115), and the current is determined based on the determination result. Determine the level of the correction value.

Specifically, in step S113, ΔV
If it is "YES" (L1≤ΔV <L2), it is determined whether or not there is a relation of <L2, and after performing step S116 of adding the current correction value I1 to the threshold value Is, step S122 and subsequent steps are performed. Control of.

Further, in step S114 executed when "NO" is determined in step S113, Δ
If it is "YES" (L2≤ΔV <L3), it is determined whether or not the relationship of V <L3 is satisfied, and after step S117 of adding the current correction value I2 to the threshold value Is is executed, step S122 and subsequent steps are performed. Control of.

In step S115, which is executed when "NO" is determined in step S114, ΔV <L
It is judged whether or not there is a relationship of 4, and if “YES” (L
3 ≦ ΔV <L4), the current correction value I3 is set to the threshold value Is.
After performing step S118 of adding
The control after 122 is executed.

Furthermore, "NO" in the above step S115.
If it is determined that L4 ≦ ΔV, the current correction value I4 is added to the threshold value Is in step S119, the retry flag RTF is reset to “0”, and the correction value holding flag HF is set to “1”. After step S120 and step S121 of setting the timer time TX of the correction time timer to Tmax (value corresponding to 400 ms) are sequentially executed,
The process moves to step S132 shown in FIG.

In short, when the drop detection flag KF is set to "1", that is, when the sampling voltage V drops by the set voltage width Va or more, the threshold Is used for the trapping prevention function is changed in voltage. It is possible to switch to a correction operation mode in which correction is performed based on the amount ΔV.

In this case, the retry flag RTF is set to "1" when the level of the current correction value added to the threshold value Is is set to 0, I1, I2, or I3. Then, it is determined as "NO" in the step S132, and the execution of the step S133 is blocked. For this reason, the reference sampling voltage V ′ is maintained as it is without being updated, and thereafter, the above-described step S for correcting the threshold value Is is performed.
There are cases in which the level of the current correction value is changed as steps 112 to S123 are selectively performed.

On the other hand, when the level of the current correction value added to the threshold value Is is set to I4 which is the highest level, the retry flag RTF is reset to "0". Therefore, "YES" in the step S132.
Since it is determined that step S133 is executed, the latest sampling voltage V is updated and stored as a new reference sampling voltage V '.

When the level of the current correction value is set to I4, the correction value holding flag HF is set to "1". For this reason, it is judged "NO" in the step S110, and in this case, the process moves to the judgment step S124 shown in FIG. As a result, the above-described step S112 for correcting the threshold value Is is performed.
The execution of S123 to S123 is stopped, and the set current correction value I4 is held as it is.

On the other hand, in step S124 shown in FIG.
It is determined whether or not the relationship of ΔV> 0 has been established, that is, whether or not the latest sampling voltage V has risen above the reference sampling voltage V ′.

If "YES" is determined in the above step S124, it is determined whether or not the voltage change amount ΔV is 0.4 V or less (S125), and if "NO" is determined in the step S124. Indicates that the voltage change amount ΔV is ΔV ≦
Whether or not the relationship is −0.8 V, that is, the latest sampling voltage V is 0.8 than the reference sampling voltage V ′.
It is determined whether or not it has decreased by V or more (S126). The auxiliary voltage width in the invention described in claim 5 refers to 0.8V.

When it is judged "NO" at the step S125 (when the voltage change amount ΔV exceeds 0.4V) and when it is judged "YES" at the step S126 (the voltage change amount ΔV is -0.8V). If it is above), step S127 of resetting the timer time TX of the correction time timer to Tmax is executed, and then the control of step S132 and thereafter is executed.

Further, when it is determined to be "YES" in step S125 (when the voltage change amount ΔV is 0.4 V or less) and when it is determined to be "NO" in step S126 (voltage change amount ΔV is -0). If it is less than 0.8 V), it is determined whether the timer time TX of the correction timer is zero (S128).

When TX ≠ 0, the timer time T
After step S129 of decrementing X (initial value is Tmax) by "1", the control after step S132 is executed. However, if TX = 0, the decrease detection flag KF, the correction value holding flag Step S130 of resetting the HF and the retry flag RTF to "0",
After sequentially executing step S131 for initializing the current correction value (processing for returning to zero), the control after step S132 is executed.

In short, when the drop detection flag KF is set to "1" (the threshold value Is for the trapping prevention function Is).
Of the voltage change amount ΔV), the voltage change amount ΔV
Is higher than 0.4 V and the voltage change amount ΔV is decreased by 0.8 V or more, neither occurs, and the timer time Tmax set in the correction time timer is set.
When (400 ms) has elapsed, step S130
And S131 are executed and returned to the initial state, whereby the correction operation mode ends.

Further, when the voltage change amount ΔV rises above 0.4V or the voltage change amount ΔV decreases by 0.8V or more in the state where the correction operation mode is switched to, , Step S127 is executed and the timer operation by the correction time timer is re-executed from the beginning.

That is, in the correction operation mode, the voltage change amount Δ
It will be terminated only when the state where V drops to 0.4 V or less is continued for 400 ms. Further, during the period in which the correction operation mode is switched to, the sampling voltage V (power supply voltage) is 0.
When the voltage drops by 8 V or more, the correction operation mode is additionally continued for the timer time Tmax (400 ms). It should be noted that such a decrease phenomenon of the sampling voltage occurs, for example, when the cranking is performed again.

According to the present embodiment configured as described above, the following actions and effects can be obtained. The control circuit 4 sequentially detects the increment (differential value) of the load current flowing through the motor 1 per unit time in a state where the forward direction energization path of the motor 1 is formed, that is, when the window glass is moved in the closing direction. However, in the stage before the window glass reaches the automatic inversion prohibition region set immediately before the closing position, the load current increment detected as described above exceeds the preset threshold value Is. In this case, the motor 1 is switched to the state in which the reverse-direction energization path is formed. As a result, the pinching prevention function that the moving direction of the window glass is automatically reversed comes to work.

Further, the control circuit 4 periodically samples the power supply voltage of the motor 1 through the AD conversion circuit 10, and a temporary voltage fluctuation phenomenon occurs in which the sampling voltage once drops and then rises again. In such a case, when the decrease width of the sampling voltage becomes equal to or larger than the preset voltage width Va, the correction operation mode is switched to.

When the control circuit 4 extracts a rising tendency of the sampling voltage above a certain level in the state of switching to the correction operation mode as described above, specifically,
When the increment of the sampling voltage is detected based on the comparison between the voltage change amount ΔV calculated based on the sampling voltage per time and the previously stored reference voltage level (see L1 to L4 shown in FIG. 6), the increment is detected. The current correction value (any one of I1 to I4) corresponding to the above is added to the threshold value Is.

That is, when the transient fluctuation phenomenon of the power supply voltage (sampling voltage) as described above occurs due to engine cranking or the like while moving the window glass in the closing direction, Since the threshold value Is is constantly changed to a larger value, it is possible to prevent the increase of the load current per unit time from exceeding the threshold value Is due to the voltage fluctuation phenomenon. Like

As a result, when a transient fluctuation of the power supply voltage occurs, as in the conventional configuration, this is erroneously recognized as a foreign substance trapped state and the direction of movement of the window glass is unnecessarily reversed. Therefore, the reliability against malfunction is increased. Further, since the level of the threshold value Is is not increased at all times when the fluctuation of the power supply voltage is small, the detection timing is delayed when a foreign object is caught, or the detection load (when the window glass is inverted) This eliminates the risk that the magnitude of the load acting on the motor 1 will unnecessarily increase.

The control circuit 4 extracts the rising tendency of the sampling voltage as described above from the sampling voltage 2
The configuration is performed based on the change amount ΔV over the sampling cycle of not less than one time, specifically, the state in which the retry flag RTF is set to “1” in response to the switching to the correction operation mode (in this state, the current correction value Level 0, I1
, I2, or I3), the sampling interval of the power supply voltage is extended by unit time α (1 sampling cycle) to obtain the voltage change amount ΔV as data over two or more sampling cycles. Therefore, even if the change pattern of the power supply voltage is different, it is possible to reliably exhibit the above-described malfunction prevention action.

In the state where the control circuit 4 is switched to the correction operation mode as described above, the state where the variation amount of the sampling voltage is equal to or lower than a constant level (0.4 V) is the set time (400 m).
s) When the operation is continued for more than the above, the operation is automatically ended, and thereafter, there is no fear that the pinch prevention function is adversely affected. In the case where a phenomenon in which the power supply voltage drops by a preset auxiliary voltage width (0.8 V) or more occurs due to re-cranking or the like during the period in which the correction mode is continued, Since the correction operation mode is extended by the set time (400 ms), it is possible to properly prevent the malfunction of the entrapment prevention function due to such a re-drop phenomenon of the power supply voltage.

In the above embodiment, when the control circuit 4 switches to the correction operation mode, the current correction value (I1 to I4) corresponding to the increment of the sampling voltage is added to the threshold value Is. However, the level of the correction current value added at this time may be set to a value sufficiently larger than the maximum value of the increment of the load current flowing through the motor 1 per unit time.

According to this structure, when a transient fluctuation phenomenon of the power source voltage due to engine cranking or the like occurs during the movement of the window glass in the closing direction, it is substantially prevented. Since the threshold value Is is expanded to infinity and the load magnitude determination operation of the motor 1 based on the threshold value Is is invalidated, the trapping prevention function malfunctions. It can be surely prevented.

Further, when the power supply voltage detected through the A / D conversion circuit 10 is reduced by a preset voltage width or more, for example, by dropping the voltage signal Vd from the shunt resistor 3 to zero level. The current detection function of the shunt resistor 3 may be invalidated.

According to this configuration, when the transient fluctuation phenomenon of the power supply voltage occurs during the movement of the window glass in the closing direction, the decrease width of the detection voltage by the AD conversion circuit 10 becomes When the voltage width is equal to or more than the preset voltage width, the current detection function of the shunt resistor 3 is disabled. Therefore, even in this case, the motor 1
Since the determination operation of the load magnitude of 1 is invalidated, it is possible to reliably prevent a situation in which the entrapment prevention function malfunctions.

The present invention is not limited to the above embodiment, but can be expanded or modified as described below. The window glass in the present invention is a concept including so-called sunroof and the like. There are four levels of current correction value (I
1, I2, I3, I4), but may be set in multiple stages or less than four stages. Control circuit 4
May be configured to end the correction operation mode when the amount of change in the power supply voltage detected through the A / D conversion circuit 10 converges below a certain level.

[0076]

According to the present invention, as apparent from the above description, the increment per unit time of the load current is preset before the window glass moving in the closing direction reaches the closing position. In the control device of the vehicle power window regulator that reverses the moving direction of the window glass when it becomes equal to or higher than the threshold value, the power supply voltage detected by the voltage detecting means is reduced by a preset voltage width or more. When the detected voltage rises above a certain level in the correction operation mode, a preset current correction value is added to the threshold value. because was configuration providing a correction means, a situation in which catch prevention function to malfunction due to temporary fluctuations in the power supply voltage, the detection timing of the jamming state It is intended to achieve the beneficial effect of preventing without increasing Les and detection load.

[Brief description of drawings]

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

FIG. 2 is a flow chart showing a main part of control contents.

FIG. 3 is a flowchart showing a main part of control contents, part 2

FIG. 4 is a timing chart showing an example of a change in power supply voltage and an example of a current correction value.

FIG. 5 is a diagram showing an example of a current correction value data table.

FIG. 6 is a diagram for explaining a magnitude relationship of reference voltage levels that are used as a reference for determining a current correction value.

[Explanation of symbols]

In the drawings, 1 is a motor, 3 is a shunt resistance (current detection means), 4 is a control circuit (correction means), 6 is a limit switch, and 10 is an AD conversion circuit (voltage detection means).

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Issei Hayashi, Noda No. 1, Toyoda, Oguchi-machi, Niwa-gun, Aichi Prefecture Tokai Rika Electric Co., Ltd. (56) Reference JP-A-7-67385 (JP, A ) Japanese Patent Laid-Open No. 59-99979 (JP, A) Actual Development 4-62881 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E05F 15/00 B60J 1/00

Claims (5)

(57) [Claims] 1. A motor for reciprocating a window glass, and a current detecting means for detecting a load current flowing through the motor, wherein the window glass is closed when the window glass is moved in a closing direction. Control device for vehicle power window regulator, which reverses the moving direction of the window glass when the increment per unit time of the load current exceeds a preset threshold value before reaching the position In the above, the voltage detection means for detecting the power supply voltage of the motor and the correction operation mode are switched to the correction operation mode when the voltage detected by the voltage detection means is in a state of decreasing by a preset voltage width or more. Then, a correction means for adding a preset current correction value to the threshold value when the rising tendency of the detection voltage above a certain level is extracted, A control device for a vehicle power window regulator, characterized in that provided. 2. The voltage detection means is provided so as to detect the power supply voltage of the motor at a constant sampling cycle, and the correction means detects the rising tendency of the detection voltage by the voltage detection means. a control device for a vehicle power window regulator according to claim 1, characterized in that it is configured to be performed based on the amount of change in the voltage at the sampling period of more than two voltage. 3. The correction means is configured to end the correction operation mode when the amount of change in the voltage detected by the voltage detection means per unit time continues for a set time or more and is below a certain level. The control device for a vehicle power window regulator according to claim 1 or 2, wherein. 4. The correction means is configured to end the correction operation mode when the amount of change in the voltage detected by the voltage detection means converges to a predetermined level or less. Alternatively, the control device for the vehicle power window regulator according to the second aspect. 5. The correction means extends the correction operation mode for a predetermined time when the voltage detected by the voltage detection means falls by a preset auxiliary voltage width or more in a state before the end of the correction operation mode. The control device for a vehicle power window regulator according to claim 3 or 4, wherein the control device is a vehicle power window regulator.