JPH10280803A - Device for detecting existence of nip-holding of window glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly release the detection of the existence of a nip-holding window glass even if an error occurs at the totally closed position of the window glass. SOLUTION: A controller 2 counts the building up or trailing edge of a pulse signal SP based on the closing motion of a window glass from a predetermined reference position during the opening of the window glass. The counted value is compared with a reference count value predetermined for releasing the judging action of the existence of the nip-holding, and when the count value arrives at the reference count value, the controller 2 releases a judging action for the existence of the nip-holding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the presence or absence of a pinch of a window glass, and more particularly, to detecting a pinch of an object or the like in a closed window glass and releasing the pinched object from the pinch state. The present invention relates to a device for detecting the presence / absence of a sandwiched window glass.

[0002]

2. Description of the Related Art Conventionally, an automobile power window device is
The window glass is opened and closed by operating the window open / close switch. More specifically, when the window close switch is operated, for example, when the window is fully open, power is supplied to a motor for moving the window glass up and down, and the window glass is rotated in a closing direction. And
When the glass is completely closed, the power supply to the motor is stopped, and the glass closing operation is completed.

[0003] Some power window devices of this type are provided with a pinch prevention mechanism. When the window glass is performing a closing operation, for example, when an object is caught in the glass and a further closing operation becomes impossible while the window glass is performing the closing operation, the detection mechanism detects that the window glass is caught and removes the glass. The object is opened in the opening direction to release a pinched object.

There is a pulse detection method for detecting that the object or the like has been caught (hereinafter, detection of the presence or absence of being caught). This pulse detection method is performed by detecting a rotation speed of a motor that opens and closes a window glass and generating a pulse signal having a period proportional to the rotation speed. Generally, when the rotation speed of the motor is high, the pulse period is short, and when it is low, the pulse period is long. Utilization of the fluctuation of the pulse period is used to detect the presence / absence of pinching.

[0005] By the way, a door frame or a body frame opposed to the direction in which the window glass closes,
A weather strip made of rubber or the like is attached to prevent liquid from entering the inside of the vehicle from a gap between the glass and the frame. Now, when the window glass in the closing operation reaches the weather strip and the end of the glass is inserted into the insertion groove of the weather strip, the sliding resistance of the glass increases. Then, the rotation of the motor decreases, and the pulse period increases based on the decrease in the rotation. That is,
An erroneous judgment is made that something has been caught.

Therefore, conventionally, when the window glass that is closing is at a position spaced a predetermined distance from the fully closed position inserted into the weather strip, the limit switch provided inside the motor is changed from the on state to the off state. It can be switched to. Then, based on the switching of the limit switch to the off state, the detection of the presence / absence of pinching is released.

As shown in FIG. 7, the switching timing of the state of the limit switch is from the fully closed position (position where the window glass WG and the weather strip WS are in close contact) P1 of the window glass WG to the direction of opening. Is set at a position separated by a predetermined interval Y1. The interval Y1 is set so that the gap between the window glass WG and the weather strip WS is a predetermined interval Y2. This interval Y2 is such that the finger or the like
This is an interval that does not enter the gap formed by G and the weather strip WS. Therefore, when the window glass WG performing the closing operation reaches the predetermined interval Y1 before the fully closed position, the necessity of detecting the presence / absence of the pinch is small, and the window glass WG reaches the position where the above-described adverse effect due to the presence / absence of the pinch detection occurs. The limit switch will be switched to the off state.

[0008]

However, the fully closed position P1 of the window glass WG moves in the closing direction of the glass WG due to aging of the weather strip WS made of rubber or the like. In this movement, the switching timing position of the state of the limit switch also moves in the same direction.
More specifically, when the fully closed position P1 moves to a position P2 indicated by a two-dot chain line in FIG. 7, the switching timing position of the limit switch is a position opened by an interval Y1 from the position P2 based on the position P2. .

Therefore, the window glass W that is closing
When G reaches a predetermined interval Y1 before the fully closed position P2, there may be a case where there is no gap between the window glass WG and the weather strip WS. That is, there is a problem that the release of the detection of the presence of the pinch is delayed and an erroneous determination is made.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to surely cancel the detection of the presence / absence of the sandwiching of a window glass even if an error occurs in the fully closed position of the window glass. An object of the present invention is to provide an apparatus for detecting the presence or absence of pinching of a window glass which can be performed.

[0011]

According to a first aspect of the present invention, there is provided a driving circuit for supplying a driving power supply for driving a motor for opening and closing a window glass to perform forward and reverse rotations.
A pulse signal having a pulse cycle corresponding to the rotation speed of the motor is input, the pulse cycle of the pulse signal at each time is obtained, and it is determined whether or not the pulse signal is sandwiched by the window glass based on the cycle variation of the pulse cycle. When it is determined that the window glass has been sandwiched, in a window glass sandwiching presence / absence detection device including a determination unit that reversely drives the motor through the drive circuit, a predetermined reference position when the window glass is opened is determined. The rising or falling of the pulse signal based on the closing operation of the glass is counted, and the counted value is compared with a reference count value predetermined to cancel the judging operation of the judging means. When the value reaches the reference count value,
The gist of the invention is that a determination cancellation means for canceling the determination operation of the determination means is provided.

[0012] According to a second aspect of the present invention, in the device,
Detecting means for detecting a position at a predetermined interval from the fully closed position of the window glass is provided, and the determination canceling means detects the drive circuit based on the pulse signal and a detection signal from the detecting means. The driving power supply to the motor is shut off to stop the closing operation of the window glass via.

The invention according to claim 3, wherein the reference count value is the count value when a detection signal is output from the detection means at an initial setting immediately after assembly where the fully closed position has not moved. The gist is that

According to a fourth aspect of the present invention, the determination means inputs a pulse signal having a pulse period corresponding to the rotation speed of the motor, obtains a pulse period of the pulse signal at each time, and determines a predetermined past pulse period. A period difference value calculating means for obtaining an average pulse period with a plurality of pulse periods, and a period difference value between the average pulse period and the pulse period at that time; and a period at that time calculated by the period difference value calculating unit A period difference sum calculation means for calculating a period difference sum obtained by summing the difference value and a plurality of predetermined period difference values in the past; and comparing the period difference sum with a predetermined threshold value, A determining drive unit configured to determine that the motor is sandwiched by the glass when the periodic difference sum exceeds a predetermined threshold during the closing operation, and to reversely drive the motor via the drive circuit; The gist.

According to the first aspect of the present invention, the determination canceling means counts the rising or falling of the pulse signal based on the closing operation of the glass from a predetermined reference position when the window glass is opened. Then, the count value is compared with a predetermined reference count value for canceling the judgment operation of the judgment means, and when the count value reaches the reference count value, the judgment operation of the judgment means is canceled. That is, the determination canceling unit compares the count value based on the predetermined position when the glass is opened with the reference count value. Therefore, even if an error occurs in the fully closed position of the window glass, the detection of the presence / absence of pinching of the glass can be reliably released.

According to a second aspect of the present invention, the detecting means detects a position at a predetermined interval from the fully closed position of the window glass. The determination canceling unit cuts off the driving power supply to the motor based on the pulse signal and the detection signal from the detecting unit to stop the closing operation of the window glass via the driving circuit. Therefore, the determination canceling means is sure to stop the closing operation of the window glass based on both signals.

According to the third aspect of the present invention, the reference count value is a count value when a detection signal is output from the detection means at the time of initial setting immediately after assembly where the fully closed position has not moved. . Therefore, the reference count value can be easily set by the detecting means.

According to the fourth aspect of the invention, the period difference value calculating means inputs a pulse signal having a pulse period corresponding to the rotation speed of the motor, obtains the pulse period of the pulse signal at each time, and determines the pulse period. An average pulse period is obtained from the plurality of past pulse periods, and a period difference value is obtained from the average pulse period and the pulse period at that time. The period difference sum calculating means calculates a period difference sum obtained by summing the current period difference value calculated by the period difference value calculating means and a plurality of predetermined past period difference values. The determination driving means compares the periodic difference sum with a predetermined threshold value, and determines that the window glass has been sandwiched when the periodic difference sum exceeds a predetermined threshold value during the closing operation of the window glass. The motor is reversely driven through the drive circuit. Therefore, it is possible to reliably detect the presence / absence of pinching of the window glass.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an electrical configuration of the power window device 1. The controller 2 serving as the determination unit, the determination release unit, the period difference value calculation unit, the period difference sum calculation unit, and the determination driving unit inputs a 5-volt operating power from the constant voltage circuit 3. Constant voltage circuit 3
Is a battery power supply (12 volts) via the diode 4
Input B to generate a 5 volt operating power supply.

The closing switch 5, the opening switch 6, and the auto switch 7 are provided on the inner surface of the door. The closing operation switch 5 is a switch for operating the window glass WG in a closing direction (upward movement) as shown in FIG. 7, and the opening operation switch 6 is a window glass WG.
Is a switch for operating in the opening direction (downward movement). Both switches 5 and 6 are turned on / off by selectively operating a swing type power window switch. That is, when the power window switch is swung to one side, the closing operation switch 5 is turned on, and when the power window switch is swung to the other side, the opening operation switch 6 is turned on. The switches 5 and 6 are turned on only when the occupant is operating, and return to the neutral position and are turned off when the operating force is released.

The auto switch 7 is turned on and off by selectively switching and pressing a swing type power window switch. Then, even when the pressing operation of the occupant is released, the window glass WG is operated to the fully opened / closed state based on the operation of the auto switch 7 to the opening operation side or the closing operation side under the control of the controller 2. Each of the switches 5 to 7 is connected to the controller 2 and outputs an on / off signal to the controller 2.

The controller 2 and a window glass WG
The relay drive circuit 8 and the relay circuit 8a are connected in series between the motor M which operates the relay motor 8 and the motor M. The relay drive circuit 8 drives the relay circuit 8a based on the drive control signal from the controller 2 to supply or stop the drive power to the motor M and to perform forward or reverse rotation. That is, the relay drive circuit 8 and the relay circuit 8a
Is configured as a driving circuit for driving.

The relay circuit 8a includes two exciting coils L1 and L2 and changeover switches X1 and X2. The exciting coils L1 and L2 are connected in parallel between the relay drive circuit 8 and the battery, and supply or cutoff of the battery power B is performed based on the control of the circuit 8. Excitation coil L
1 is a state in which the battery power supply B is supplied in response to a drive control signal from the controller 2 based on the ON signal of the closing operation switch 5 to be in an excited state (the exciting coil L2 is in a non-excited state). On the other hand, in response to the drive control signal from the controller 2 based on the ON signal of the opening operation switch 6, the excitation coil L2 is turned off and the battery power supply B is turned off (the excitation coil L1 is not excited). Each of the exciting coils L1 and L2 has a diode D for a flywheel.
1 and D2 are connected in parallel.

The changeover switches X1 and X2 are connected to the anode and the cathode of the motor M, respectively.
2 is switched between the battery power supply B and the ground GND based on the excited / non-excited state. That is, when each of the excitation coils L1 and L2 is in the non-excitation state, the motor M is grounded via the changeover switches X1 and X2. On the other hand, when the exciting coil L1 is in the excited state, the switch X1 is switched to the battery power source B side, and the motor M rotates forward based on the battery power source B supplied via the switch X1.
When the exciting coil L2 is in the excited state, the changeover switch X2 is switched to the battery power supply B side, and the motor M rotates reversely based on the battery power supply B supplied via the switch X2.

That is, the relay drive circuit 8 and the relay circuit 8
a responds to a drive control signal from the controller 2 based on the ON signal of the closing operation switch 5 to drive the motor M to rotate forward to move the window glass WG upward. In addition, the relay drive circuit 8 and the relay circuit 8a reversely drive the motor M in response to a drive control signal from the controller 2 based on the ON signal of the opening operation switch 6 to lower the window glass WG.

The pulse sensor 9 is provided to the motor M, and outputs a pulse signal SP having a pulse period T0 proportional to the rotation speed of the motor M to the controller 2. That is, when the rotation speed of the motor M increases, the pulse sensor 9 outputs a pulse signal SP having a short pulse period T0 proportional to the rotation speed.
Is output to the controller 2. Therefore, conversely, the motor M
When the rotation speed of the controller 2 becomes slower, the controller 2 receives a pulse signal SP whose pulse period T0 becomes longer in proportion thereto.

Limit switch 10 as detecting means
Is connected to the controller 2 and, as shown in FIG. 7, is switched from the on-state to the off-state when it reaches a position spaced a predetermined distance Y1 from the fully-closed position P1 of the window glass WG as in the related art. That is, this position is a position where the gap between the window glass WG and the weather strip WS is the interval Y2. That is, the limit switch 10 is turned off when the rising window glass WG reaches the weather strip WS up to the interval Y2. Wind glass WG
Is in contact with the weather strip WS and further closing operation is disabled, the pulse signal SP does not change. And the controller 2 is a limit switch 1
When the OFF signal is input from 0 and the pulse signal SP stops changing, it is determined that the window glass WG is in the fully closed state, and the forward drive of the motor M is stopped via the relay drive circuit 8 and the relay circuit 8a. Let it.

The controller 2 drives the motor M to rotate forward or reverse by an ON signal from each of the switches 5 to 7 in accordance with a control program stored in the controller 2, and also outputs an OFF signal and a pulse from the limit switch 10. The motor M is stopped by the pulse signal SP from the sensor 9. Further, during the closing operation of the window glass WG, the controller 2 detects whether or not the window glass WG is pinched based on the pulse signal SP from the pulse sensor 9. When the pinching is detected by the glass WG, the controller 2 controls the relay driving circuit 8
Then, the motor M is reversely driven for a predetermined time via the relay circuit 8a to lower the glass WG by a predetermined amount.

Here, during the normal closing operation of the window glass WG, the period of the pulse signal SP from the pulse sensor 9 is constant because the motor M is rotating constantly. However, when something is pinched by the window glass WG, the rotation of the motor M gradually decreases. FIG.
Is a pulse signal SP when something is pinched while the window glass WG is transitioning from the fully open state to the fully closed state.
Shows the variation of As described above, when something is pinched by the window glass WG, the rotation of the motor M gradually decreases, so that the pulse period T0 to Tn-1 gradually increases from the pinch point.

The detection of the presence / absence of holding of the controller 2
As in the prior art, using n pulse periods T0 to Tn-1,
Average pulse period PAVE (= (T0 + T1 + ... + Tn-
1) / n) is calculated. The controller 2 calculates a period difference value PS0 (= T0-PAVE) between the pulse period T0 just obtained and the average pulse period PAVE including the pulse period T0. During the normal closing operation, the period difference value PS0 does not increase because the pulse periods T0 to Tn-1 are always constant and the average pulse period PAVE is also constant. On the other hand, when something is sandwiched between the window glasses WG, the pulse period T0 to Tn-1 gradually increases, and the period difference value PS0 gradually increases.

Next, the controller 2 determines the past n cycle difference values PS0 to PSn including the cycle difference value PS0 just calculated.
-1 is calculated to obtain a period difference sum PST. The period difference sum PST is a threshold value P previously determined by a test or the like in order to determine the presence or absence of pinching stored in the memory 2a of the controller 2.
Compared to H. When the period difference sum PST exceeds the threshold value PH, the controller 2 determines that the controller 2 is pinched, and drives the motor M reversely for a predetermined time via the relay drive circuit 8 and the relay circuit 8a to drive the glass WG. Lower by a predetermined amount.

FIG. 3 shows the fluctuation of the pulse signal SP when the window glass WG changes from the fully opened state to the fully closed state in a state where nothing is sandwiched. The above-described detection of the presence / absence of the pinch is released when the ascending window glass WG reaches a position at a predetermined interval from the fully closed position. More specifically, a counter 2b provided inside the controller 2 obtains a count value km obtained by adding "1" every time the pulse signal SP rises with the fully opened state of the window glass WG being "0". on the other hand,
A reference count value k0 to be compared with the count value km is stored in the memory 2a of the controller 2 at the time of initialization. The reference count value k0 is set corresponding to a position at which the window glass WG is apart from the fully closed position by a predetermined distance. Then, the controller 2 controls the window glass WG
When the count value km added based on the rise of the value reaches the reference count value k0, the detection of the presence or absence of the pinching is released.

The reference count value k 0 is initialized according to the flowchart shown in FIG. 4 immediately after the power window device 1 is assembled, that is, when the weather strip WS is not deteriorated. The window glass WG is in the fully opened state, and the count value Km is "0".

In step 21, the pulse signal SP from the pulse sensor 9 is input as the window glass WG rises, and in step 22, "1" is added to the count value km based on the rise of the signal SP (counting). up). Next, in step 23, the window glass W
Based on the rise of G, it is determined whether the limit switch 10 has been turned off. When the limit switch 10 is turned off, that is, when it is determined to be “YES”, step 2 is executed.
Proceed to 4. On the other hand, if it is determined that the switch 10 has not been turned off, that is, if "NO", the process returns to step 21. That is, in step 23, the steps 21 and 22 are repeated until the limit switch 10 is turned on. It is.

Next, at step 24, the count value km at that time is replaced with the reference count value k0,
a. When the pulse signal SP is no longer changed in step 25, the controller 2 determines that the window glass WG is in the fully closed state, and in step 26
, The forward drive of the motor M is stopped via the relay drive circuit 8 and the relay circuit 8a. Thus, the reference count value k0 is initialized.

That is, at the time of the initial setting, the reference count value k0 is determined when an off signal is input from the limit switch 10 based on the fully opened state of the window glass WG.
That is, the count value km at the position where the gap between the window glass WG and the weather strip WS is the interval Y2 is set as the value.

After the initial setting, the detection of the presence or absence of the pinch is canceled by using the reference count value k0 based on the fully opened state of the window glass WG.
Is to be performed independently. Therefore, for example, the fully closed position P1 of the window glass WG moves to a position P2 indicated by a two-dot chain line in FIG. 7 due to aging of the weather strip WS and the like, and a limit switch as shown by a dotted line in FIG. Even if the OFF operation of 10 is delayed, its release operation is not affected. Therefore, even if an error occurs in the fully closed position of the window glass WG, the detection of the presence / absence of holding can be reliably performed.

Next, the operation of the power window device 1 configured as described above will be described. FIGS. 5 and 6 show a pinch determination control routine of the power window device 1 executed by the controller 2. This control routine is started when the operation is started in the direction in which the window glass WG is closed, that is, based on the ON signal of the closing operation switch 5. Further, the counter is reset, and the count value km becomes "0".

In step 31, the pulse signal SP from the pulse sensor 9 is input, and in step 32, "1" is added to the count value km based on the rise of the pulse signal SP (count up). Step 33
Then, the pulse period T0 of the pulse signal SP just input is obtained. Next, in step 34, it is determined whether or not n pulse periods T0 to Tn-1 have been obtained including the pulse period T0 just obtained. If "NO" is determined in the step 34, the controller 2 returns to the step 31 and inputs the pulse signal SP. That is, n pulse periods T
Steps 31 to 34 are repeated until 0 to Tn-1 are obtained. When n pulse periods T0 to Tn-1 are obtained, "YE
S ”, and proceeds to step S35.

In step 35, n pulse periods T0
ＴTn−1, the average pulse period PAVE (= (T0 +
T1 + ... + Tn-1) / n) is calculated. Next, at step 36, the period difference value PS0 between the pulse period T0 just obtained and the average pulse period PAVE including the pulse period T0 is obtained.
(= T0-PAVE) is calculated.

In step 37, the period difference value P just obtained
It is determined whether or not n period difference values PS0 to PSn-1 including S0 have been obtained. If “NO” is determined in the step 37, the controller 2 returns to the step 31. That is, steps 31 to 37 are repeated until n number of period difference values PS0 to PSn-1 are obtained, and the n number of the difference values PS0 to PSn-1 are obtained.
If PSn−1 is obtained, “YES” is determined and the routine proceeds to step 38. In step 38, the n period difference values PS0 to PSn
The sum of the period differences PST obtained by adding -1 is calculated. Next, at step 39, it is determined whether or not the count value km, which is obtained by adding "1" every time the pulse signal SP rises at step 32, has reached the reference count value k0. The count value km reaches the reference count value k0, that is, "YES".
Is determined, the controller 2 cancels the detection of the presence / absence of pinching, and proceeds to step 40. In step 40, the motor M
, The window glass WG is continuously raised.

In step 41, it is determined whether or not the window glass WG is in a fully closed state. That is, as described above, when the limit switch 10 is turned off and the pulse signal SP no longer changes, it is determined that the glass WG is in the fully closed state, and the routine proceeds to step 42. In step 42, the driving of the motor M is stopped, and then the control routine is ended (END). Also, the limit switch 10 is turned on,
Alternatively, when the switch 10 is off and there is a change in the pulse signal SP, it is determined that the window glass WG is in the process of rising, and the process returns to step 31. That is, until the window glass WG is fully closed, step 31
To 41 are repeated.

On the other hand, if it is determined in step 39 that the count value km has not reached the reference count value k0, that is, if "NO", the controller 2 proceeds to step 43.
Proceed to. In step 43, the calculated period difference sum P
ST is compared with the threshold value PH. If the period difference sum PST is larger than the threshold value PH, it is determined that something is caught, that is, "YES", and the routine proceeds to step 44. In step 44, the motor M is switched from the forward drive to the reverse drive for a predetermined time via the relay drive circuit 8 and the relay circuit 8a, and the process proceeds to step 45. In step 45, the motor M is driven to rotate in the reverse direction for a predetermined time, and the rising window glass WG is lowered by a predetermined amount. Then, the object held by the window glass WG can be released. Then, after lowering the window glass WG by a predetermined amount, the control routine ends (END).

If it is determined in step 43 that the period difference sum PST is equal to or less than the threshold value PH, nothing is sandwiched, that is, "NO" is determined, and the routine proceeds to step 40.
As described above, the controller 2 performs steps 40 to 4
Steps 31 to 41 are repeated until the window glass WG is fully closed in Step 2. Thus, the controller 2 in the present embodiment detects whether or not the window glass WG is pinched.

As described above, according to the present embodiment,
It has the following features. (1) The detection of the presence / absence of sandwiching is canceled independently of the limit switch 10 using the reference count value k0 based on the fully opened state of the window glass WG. Therefore, even if the OFF operation of the limit switch 10 is delayed due to, for example, aging of the weather strip WS, the release operation is not affected. Therefore, even if an error occurs in the fully closed position of the window glass WG, the detection of the presence / absence of holding can be reliably performed.

(2) In step 41, when the limit switch 10 is turned off and the pulse signal SP stops changing, it is determined that the window glass WG is in the fully closed state. Therefore, the fully closed state of the window glass WG can be reliably determined.

(3) The reference count value k 0 is a count value km when an OFF signal is input from the limit switch 10 based on the fully opened state of the window glass WG at the time of the initial setting. Therefore, the setting of the reference count value k0 can be easily performed by the existing limit switch 10.

(4) Whether the controller 2 is pinched or not
First, a pulse signal SP is input from the pulse sensor 9, an average pulse period PAVE is obtained from the pulse signal SP, and a period difference value PS0 is obtained from the average pulse period PAVE and the pulse period T0 at that time. Next, a period difference sum PST is obtained by summing the period difference value PS0 and a plurality of predetermined past period difference values PS1 to PSn-1. During the closing operation of the window glass, when the period difference sum PST exceeds a predetermined threshold value PH, it is determined that the window glass is sandwiched, and the motor M is connected via the relay drive circuit 8 and the relay circuit 8a.
Is driven in reverse. Therefore, it is possible to reliably detect the presence / absence of pinching of the window glass.

The present invention may be carried out in the following modes in addition to the above embodiment. In the above-described embodiment, the step 39 for comparing the count value km with the reference count value k0 is performed after the step 38 for obtaining the period difference sum PST. However, the step 39 is a step 32 for counting up the count value km. If it is later and before step 44 for driving the motor M reversely, it may be arranged at another position.

In the above embodiment, the count value km is counted up based on the rising edge of the pulse signal SP, but may be counted up based on the falling edge. In the above-described embodiment, the limit switch 10 is switched from the on state to the off state at the position where the rising window glass WG is spaced from the weather strip WS by the distance Y2. Conversely, when the limit switch 10 reaches the position, the limit switch 10 is switched from the off state to the on state. May be switched.

In the above embodiment, the reference count value k
0 is the count value km when the OFF signal is input from the limit switch 10 based on the fully opened state of the window glass WG. However, the limit switch 10 may be omitted and the reference count value k0 may be set in advance by calculation or the like. . In this case, in step 41, when the limit switch 10 is turned off and the pulse signal SP no longer changes, it is determined that the window glass WG is in the fully closed state. However, the fully closed state of the glass WG is determined only by the pulse signal SP. It will be determined.

[0052]

As described in detail above, according to the present invention,
Even if an error occurs in the fully closed position of the window glass, it is possible to provide a detection device for detecting whether or not the glass is held, which can surely cancel the detection of whether or not the glass is held.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram of a power window device according to an embodiment.

FIG. 2 is a waveform diagram showing a pulse signal.

FIG. 3 is an explanatory diagram showing the operation of a pulse signal and a limit switch.

FIG. 4 is a flowchart showing an initial setting routine of a reference count value.

FIG. 5 is a flowchart illustrating a sandwiching determination routine.

FIG. 6 is a flowchart showing a pinching determination routine.

FIG. 7 is an essential part cross-sectional view showing a wind glass and a weather strip.

[Explanation of symbols]

2 ... determining means, determination canceling means, periodic difference value calculating means, periodic difference sum calculating means, and controller as determining driving means, 8 ... relay driving circuit constituting a driving circuit, 8a
... A relay circuit constituting a drive circuit, 10... A limit switch as detecting means, k0... A reference count value, km.
Count value, M: Motor, P1: Fully closed position, PAVE: Average pulse period, PH: Threshold value, PS0 to PSn-1: Period difference value, PST: Period difference sum, SP: Pulse signal, T0 to T
n-1 ... pulse period, WG ... window glass, Y1 ... interval.

Claims (4)

[Claims] 1. A drive circuit (8, 8a) for supplying drive power for forward / reverse rotation of a motor (M) for opening and closing a window glass (WG), and a rotation speed of the motor (M). The opposite pulse period (T
0), a pulse period (T0) of the pulse signal (SP) at each time is obtained, and the window glass (W) is determined based on the period variation of the pulse period (T0).
G) to determine whether or not the motor (M) is sandwiched by the glass, and when it is determined that the motor (M) is sandwiched by the glass, determiner (2) that reversely drives the motor (M) via the drive circuit (8, 8a). In the apparatus for detecting the presence / absence of pinching of a window glass, the pulse signal (SP) rises or rises based on a closing operation of the window (WG) from a predetermined reference position when the window (WG) is opened. The number of drops is counted, and the count value (km) is compared with a predetermined reference count value (k0) for canceling the judgment operation of the judgment means (2). An apparatus for detecting the presence / absence of pinching of a window glass, comprising: a judgment canceling means (2) for canceling the judging operation of the judging means (2) when (k0) is reached. 2. The apparatus has a window glass (W).
G), a detecting means (10) for detecting a position at a predetermined interval (Y1) from the fully closed position (P1), and the determination canceling means (2) is provided with the pulse signal (SP).
And a drive power supply for the motor (M) to stop the closing operation of the window glass (WG) via the drive circuit (8, 8a) based on the detection signal from the detection means (10). The windshield sandwiching detection device according to claim 1, wherein the windshield is blocked. 3. The reference count value (k0) is set at the time of initial setting immediately after assembly where the fully closed position (P1) has not moved, when the detection signal is output from the detection means (10). 3. The apparatus according to claim 2, wherein the count value is a count value (km). 4. The method according to claim 1, wherein the determining unit is configured to determine a pulse period (T) corresponding to a rotation speed of the motor (M).
0), the pulse period (T0) of the pulse signal (SP) at each time is obtained, and an average pulse is calculated with a plurality of predetermined past pulse periods (T1 to Tn-1). The period (PAVE) is obtained, and the average pulse period (PAV) is obtained.
E) and the pulse period (T0) at that time (P0).
S0) and a plurality of past cycle difference values (PS1) calculated at the time by the cycle difference value calculation means (2). To PSn-1) and the sum of the period difference (PST)
And the periodic difference sum (PST) is compared with a predetermined threshold value (PH) to calculate the periodic difference sum (PST) during the closing operation of the window glass. A determination driving means (2) for determining that the motor (M) has been sandwiched by the glass when the predetermined threshold value (PH) is exceeded, and inverting the motor (M) via the driving circuit (8, 8a); 4. The device for detecting the presence or absence of a sandwiched window glass according to claim 1, wherein: