JPH08277679A - Power window device - Google Patents

Abstract

PURPOSE: To open or close a window via opening/closing switches even when a microcomputer fails by selecting the operation signals or drive signals with a signal selecting circuit in response to the reset signal outputted from a reset circuit. CONSTITUTION: When a microcomputer 14 which is a drive signal generating means is normally operated, it generates and outputs window opening/closing drive signals S10, S12 based on the operation signals S1, S3 from opening/closing switches 1, 3, and it outputs the watch dock pulse WP to a reset circuit 15 for monitoring. When the microcomputer 14 is abnormally operated, the reset circuit 15 outputs the reset signal S15 for a reset action to the microcomputer 14. A signal selecting circuit 21 selectively outputs the operation signals S1, S3 when the reset signal S15 is outputted, and it selectively outputs the drive signals S10, S12 when no reset signal S15 is outputted. A motor 5 is driven by the selected output signals to open or close a window.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window device for opening and closing a window by a motor, and more particularly, for example, when a foreign object is caught between a window frame and a window, a predetermined pinch releasing operation rather than operating an opening / closing switch. The present invention relates to a power window device that controls the driving of a motor by a microcomputer so as to give priority to.

[0002]

2. Description of the Related Art A power window device that is widely used in vehicles such as passenger cars is generally constructed so that a window is opened and closed by rotating a motor in a forward and reverse direction by operating an opening / closing switch arranged in a door trim or an armrest. There is. By the way, in recent years, when a foreign object is caught between the window frame and the window glass, for example, by detecting the fluctuation of the load of the motor or the like, the entrapment detection device for forcibly opening the window to release the entrapment of the foreign object. Are often provided.

In the power window device equipped with this trapping detection device, even if the window is being closed by operating the closing switch, it is necessary to forcefully open the window when a foreign object is trapped. The operation signal of the open / close switch is not used as it is for driving the motor. Then, the operation signal is once taken into the microcomputer, and only when the foreign matter is not caught, a drive signal is again output from the microcomputer according to the operation signal, and the motor is driven by the drive signal. .

FIG. 20 is a circuit diagram showing a schematic structure of a conventional power window device having the above-mentioned trapping detection device.
In the figure, 1 is an open switch, 3 is a close switch, 5 is a motor, 7
Is a power supply, 9 and 11 are relays, 13 is a microcomputer (hereinafter abbreviated as a microcomputer) that performs pinch detection and release operations, 15 is a reset circuit for monitoring the operation of the microcomputer 13, and 17 is a load detection of the motor 5. Reference numeral 19 designates a limit switch for detecting a fully closed position of a window (not shown).

Both the opening and closing switches 1 and 3 are
One end is grounded and the other end is pulled up by the power supply 7 and then connected to the microcomputer 13. When not operated, the power supply 7 pulls up to a high level (in this case, the power supply 7 voltage), The operation signals S1 and S3 that are grounded to a low level when operated are output to the input terminal of the microcomputer 13. The motor 5
Both terminals 5a and 5b are connected to the common contacts 9a and 11a of the relays 9 and 11, respectively.
The normally open contacts 9c and 11c of No. 1 are connected to the power source 7, and the normally closed contacts 9b and 11b are grounded via the current detection unit 17.

In the motor 5, when the common contact 9a and the normally open contact 9c of the relay 9 and the common contact 11a and the normally closed contact 11b of the relay 11 are connected, the terminal 5a is connected to the power supply 7. At the same time, the terminal 5b is grounded and rotates in the forward direction in which the window opens. In addition, the motor 5
When the common contact 9a and the normally closed contact 9b of the relay 9 and the common contact 11a and the normally open contact 11c of the relay 11 are connected, respectively, the terminal 5b is connected to the power source 7 and the terminal 5a is grounded. , The window closes and rotates in the reverse direction.
Further, the motor 5 has a common contact 9 of the relays 9 and 11.
When a and 11a and the normally closed contacts 9b and 11b are respectively connected, both terminals 5a and 5b are grounded and stopped.

In the relays 9 and 11, when the voltage levels of the drive signals S9 and S11 applied from the microcomputer 13 to the other ends of the coils 9d and 11d whose one ends are pulled up by the power source 7 are high levels, Coil 9d, 1
Since no potential difference is generated between both ends of 1d and no magnetic flux is generated, the common contact 9 is generated by the biasing force of the biasing means (not shown).
a and 11a are connected to the normally closed contacts 9b and 11b, respectively. In addition, the relays 9 and 11
When the voltage levels of the drive signals S9 and S11 respectively become low levels, the common contact points 9a and 11a are resisted against the biasing force of the biasing means by the magnetic flux generated by the potential difference between both ends of the coils 9d and 11d. Are connected to the normally open contacts 9c and 11c, respectively.

The microcomputer 13 outputs drive signals S9 and S11 of the same level as the operation signals S1 and S3 to the relays 9 and 11 according to the operation of the open switch 1 and the close switch 3 and operates normally. During this period, a watchdog pulse WP for notifying a normal state is output, and when a reset signal S15 described later from the reset circuit 15 is input, the internal state is forcibly reset to the normal state. Has been done. To describe the levels of the drive signals S9 and S11 in detail, in the normal state in which both the open switch 1 and the close switch 3 are not operated and the operation signals S1 and S3 are at high level, the microcomputer 13
The drive signals S9 and S11 are both set to the high level,
When the open switch 1 is operated and the operation signal S1 becomes low level, the level of the drive signal S9 becomes low level, and when the close switch 3 is operated and the operation signal S3 becomes low level, the level of the drive signal S11 becomes low level. And

The reset circuit 15 is composed of, for example, an IC, monitors the watchdog pulse WP from the microcomputer 13, and resets the operation when the output of the watchdog pulse WP is stopped due to an abnormal operation of the microcomputer 13. The low active reset signal S15 is intermittently output to the microcomputer 13. The current detection unit 17 is connected to the motor 5 via the relays 9 and 11.
When one of the terminals 5a and 5b of the above is connected to the power supply 7 and the other is grounded, and the motor 5 is rotated in the forward rotation direction or the reverse rotation direction, the motor is grounded. The current Ia flowing between one of the terminals 5a, 5b of 5 and the ground is detected. Then, the current detector 17
Is configured to output a detection signal S17 whose voltage changes according to the magnitude of the current Ia to the input terminal of the microcomputer 13.

One end of the limit switch 19 is grounded and the other end is connected to the microcomputer 13. When the window reaches the fully closed position, the limit switch 19 comes into contact with the window and the internal contact point is closed. The detection signal S19 appearing at the 13 input terminals is configured to change from high level to low level.

In the conventional power window device having the above-described structure, when the open switch 1 is operated, the terminal 5a is powered via the relay 9 by the low-level drive signal S9 and the high-level drive signal S11 output from the microcomputer 13. 7, the terminal 5b is grounded via the relay 11, and the motor 5 rotates in the forward direction in which the window opens. Also,
When the close switch 3 is operated, the high level drive signal S9 and the low level drive signal S11 output from the microcomputer 13 are output.
As a result, the terminal 5a is grounded via the relay 9 and the terminal 5b is connected to the power source 7 via the relay 11, so that the motor 5 rotates in the reverse rotation direction in which the window is closed. on the other hand,
If both the opening and closing switches 1 and 3 are not operated, both terminals 5a and 5b are grounded via the relays 9 and 11 by the high-level drive signals S9 and S11 output from the microcomputer 13 to rotate the motor 5. Stops.

Further, the levels of the operation signals S1 and S3 and the level of the detection signal S17 of the current detecting section 17 form a predetermined pattern, whereby the microcomputer 13 is
When it is detected that a foreign object (not shown) is sandwiched between the window frame (not shown) and the window, the open switch 1 and the close switch 3
The drive signal S9 goes low and the drive signal S11 goes high unconditionally regardless of the operation.
As a result, the motor 5 rotates in the forward direction and the window is forcibly opened.

When the level of the detection signal S19 from the limit switch 19 changes from the high level to the low level, and the microcomputer 13 detects that the window has reached the fully closed position, Even if the level of the detection signal S17 of the current detector 17 becomes the predetermined pattern, the microcomputer 13 unconditionally sets the drive signal S9 to the low level and unconditionally sets the drive signal S11 to the high level. It does not operate like. This allows
When the window reaches the fully closed position, the motor 5 is rotated in the forward direction, the window is forcibly opened, and the window is not closed.

[0014]

However, these operations are not performed because the drive signals S9 and S11 are not output from the microcomputer 13 when an abnormality occurs in the microcomputer 13, and the operation of the watch dock signal is not performed. Even after the reset circuit 15 outputs the low active reset signal S15 to the microcomputer 13 in response to the stop,
If the microcomputer 13 does not recover, the above operation is not performed unless the microcomputer 13 is replaced.
Therefore, for example, if an unrecoverable abnormality occurs in the microcomputer 13 in a state where the window is open, the operation of opening and closing the window by the operation of the open switch 1 and the close switch 3 cannot be performed not only by the detection and release operation of the foreign matter. There was a problem that it ended up.

A structure for preventing the windows from not being opened or closed at the time of abnormality of the microcomputer in the power window device using the microcomputer is disclosed in Japanese Utility Model Laid-Open No. 64-1828.
It is disclosed in Japanese Patent No. However, this power window device merely secures a signal for opening and closing the relay on behalf of the microcomputer when the microcomputer for opening and closing the relay interposed between the opening and closing motor and the power supply is abnormal. When the microcomputer malfunctions, as described in
It does not secure the signal for switching the connection polarity of the motor and the power supply in place of the drive signal from the microcomputer.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable driving a motor for opening / closing a window in addition to the operation of the opening / closing switch, such as the detection and release operation of a foreign object. In addition, in a power window device in which a microcomputer is interposed between an open / close switch and a motor, a power window device can be surely opened / closed by the open / close switch even when the microcomputer fails. To do.

[0017]

In order to achieve the above object, the present invention outputs a watchdog pulse during normal operation, and also generates and outputs a window opening / closing drive signal based on an operation signal from an opening / closing switch. A drive signal generating unit and a reset circuit that monitors the watchdog pulse and outputs a reset signal for operation reset to the drive signal generating unit when the drive signal generating unit abnormally operates are provided, and the motor is driven by the drive signal. A power window device for driving to open and close a window, which is connected to the open / close switch and the drive signal generating means, selectively outputs the operation signal during output of the reset signal, and stops output of the reset signal. A signal selection circuit for selectively outputting the drive signal, wherein the signal selected by the signal selection circuit among the drive signal and the operation signal Ri is characterized in that so as to drive the motor.

Further, according to the present invention, a time-up signal is output to the signal selection circuit when the time count of a predetermined time is up, and the reset circuit outputs the reset signal by detecting the watchdog pulse. A timer circuit that resets the time count and stops outputting the time-up signal in conjunction with resetting is further provided, and the signal selection circuit is configured to detect the drive signal and the One of the operation signals is selected.

[0019]

According to the present invention, when the abnormal operation of the drive signal generating means is detected, the opening / closing operation is performed instead of the drive signal from the drive signal generating means based on the output of the reset signal from the reset circuit for monitoring the watchdog pulse. Since the window opening / closing motor is driven by the operation signal from the switch, even if the drive signal generating means stops outputting the drive signal due to an abnormal operation, the window cannot be opened / closed.
It should be noted that the selection of either the drive signal or the operation signal by the signal selection means is performed by the timer after the time count of the predetermined time is increased in accordance with the output of the reset signal due to the occurrence of the abnormal operation of the drive signal generation means. It is also possible to make it based on the time-up signal output from the circuit.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power window pinch detection device according to the present invention will be described below with reference to the drawings. First,
A power window device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 11. FIG. 1 is a circuit diagram showing a schematic configuration of a power window device according to a first embodiment,
In the figure, the same members and parts as those of the conventional power window device shown in FIG. 20 will be described with the same reference numerals as those shown in FIG. The power window device of the first embodiment shown in FIG. 1 includes an open switch 1, a close switch 3, a motor 5,
The power supply 7, the relays 9 and 11, the microcomputer 14 (corresponding to drive signal generating means) that performs the entrapment detection operation and the release operation, the reset circuit 15 for monitoring the operation of the microcomputer 14, the open / close switches 1 and 3 including the logic circuit group, and the microcomputer. It is provided with a signal selection circuit 21 for selecting a signal from 14, a current detection unit 17 for detecting a load of the motor 5, and a limit switch 19 for detecting a fully closed position of a window (not shown).

The open / close switches 1 and 3 are respectively
One end is grounded and the other end is pulled up by the power supply 7 and then connected to the microcomputer 14. When not operated, the pull-up by the power supply 7 brings it to a high level (power supply 7 voltage in this embodiment). The operation signals S1 and S3 that are grounded to a low level by being operated are output to the input terminal of the microcomputer 14.

In the motor 5, when the common contact 9a and the normally open contact 9c of the relay 9 and the common contact 11a and the normally closed contact 11b of the relay 11 are connected, the terminal 5a is connected to the power supply 7. At the same time, the terminal 5b is grounded and rotates in the forward direction in which the window opens. In addition, the motor 5
When the common contact 9a and the normally closed contact 9b of the relay 9 and the common contact 11a and the normally open contact 11c of the relay 11 are connected, respectively, the terminal 5b is connected to the power source 7 and the terminal 5a is grounded. , The window closes and rotates in the reverse direction.
Further, the motor 5 has a common contact 9 of the relays 9 and 11.
When a and 11a and the normally closed contacts 9b and 11b are respectively connected, both terminals 5a and 5b are grounded and stopped.

The relays 9 and 11 have NOR gate signals SN1 and SN applied from the signal selection circuit 21 to the other ends of the coils 9d and 11d whose one ends are pulled up by the power supply 7.
When the voltage level of 2 is high, the coil 9
Since there is no potential difference between both ends of d and 11d and no magnetic flux is generated, the common contacts 9a and 11a are configured to be connected to the normally closed contacts 9b and 11b by the biasing force of the biasing means (not shown). . Further, the relays 9 and 11 are
When the voltage levels of the NOR signals SN1 and SN2 become low, a potential difference is generated between both ends of the coils 9d and 11d, and the magnetic flux is generated to resist the urging force of the urging means and the common contacts 9a and 11a. Are normally open contacts 9c, 11
It is configured to be connected to each of c.

In response to the operation of the open switch 1 and the close switch 3, the microcomputer 14 outputs drive signals S10 and S12 whose levels are inverted from those of the operation signals S1 and S3 to the signal selection circuit 21, and normally During operation, a watchdog pulse WP for notifying a normal state is output, and when a reset signal S15 described later from the reset circuit 15 is input, the internal state is forcibly reset to the normal state. Is configured. Drive signal S1
To explain the levels of 0 and S12 in detail, the open switch 1
And the closing switch 3 are not operated, the operation signal S
In the normal state in which 1 and S3 are at high level, the microcomputer 14 sets the levels of the drive signals S10 and S12 to low level, the open switch 1 is operated, and the operation signal S
When 1 becomes a low level, the level of the drive signal S10 is set to a high level, the closing switch 3 is operated, and the operation signal S3
Becomes low level, the level of the drive signal S12 becomes high level.

The reset circuit 15 is composed of, for example, an IC, monitors the watchdog pulse WP from the microcomputer 14, and resets the operation when the output of the watchdog pulse WP is stopped due to an abnormal operation of the microcomputer 14. The low active reset signal S15 is intermittently output to the microcomputer 14. The current detection unit 17 is connected to the motor 5 via the relays 9 and 11.
One of the terminals 5a and 5b of the motor 5 is connected to the power source 7 and the other is grounded, and either of the motors 5 is grounded when it is rotated in the forward or reverse direction. Current Ia flowing between one terminal 5a, 5b and ground
To detect. Then, the current detector 17 determines the current Ia.
Is output to the input terminal of the microcomputer 14 as a detection signal S17 whose voltage changes according to the magnitude of the.

One end of the limit switch 19 is grounded and the other end is connected to the microcomputer 14. When the window reaches the fully closed position, the limit switch 19 comes into contact with the window and the internal contact point is closed. The detection signal S19 appearing at the 14 input terminals is configured so that its level changes from low level to high level.

The signal selection circuit 21 includes four ANDs.
(Logical product) gates A1 to A4 and AND gates A1 and A
NOR gate N1 which takes the NOR of 2 and outputs the NOR signal SN1 to the relay 9;
NOR gate N2 which takes the NOR of the D gates A3 and A4 and outputs the NOR signal SN2 to the relay 11.
It consists of and.

The AND gate A1 receives the inverted signal R1 of the operation signal S1 from the open switch 1 and the reset circuit 15.
AND signal A1 is output to the NOR gate N1 and the AND signal is output from the AND gate A2.
Is a logical product of the reset signal S15 and a drive signal S10, which will be described later, output from the microcomputer 14 in response to the operation signal S1 from the open switch 1 to obtain the NOR gate N1.
And outputs a logical product signal SA2. Further, the AND gate A3 has an inversion signal R3 of the operation signal S3 from the closing switch 3 and a reset signal S15 from the NOT gate T23.
AND signal R23 and the logical product signal SA
3 is output, and the AND gate A4 outputs the reset signal S
15 and a drive signal S12, which will be described later, output from the microcomputer 14 in response to the operation signal S3 from the close switch 3 are ANDed and a logical product signal SA4 is output.

Next, the operation (action) of the power window device of this embodiment constructed as described above will be explained.
First, while the microcomputer 14 is operating normally, the level of the reset signal S15 from the reset circuit 15 becomes high and the inverted signal R23 of the reset signal S15 is obtained.
Becomes low level.

Therefore, when the open switch 1 is operated during normal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a low level operation signal S1 and a high level operation signal S3, as shown in FIG. As described above, the microcomputer 14 drives the high-level drive signal S10 and the low-level drive signal S1.
2 is output respectively. An AND signal to which the high-level inversion signal R1 and the low-level inversion signal R23 are input
The gate A1 outputs a low-level AND signal SA1, and the low-level inverted signals R3 and R23 are input to the gate A1.
The ND gate A3 also outputs a low-level AND signal SA3. On the other hand, the AND gates A2 and A4 to which the high-level reset signal S15 is input are driven by the drive signals S10 and S.
12 outputs a high-level AND signal SA2 and a low-level AND signal SA4, respectively.

Therefore, since the logical product signal SA1 is at the low level and the logical product signal SA2 is at the high level, N
The NOR gate signal SN1 output from the OR gate N1 is at a low level, while the AND signals SA3 and SA4 are both at a low level, the NOR gate signal SN2 output from the NOR gate N2 is at a high level. And
The low-level NOR signal SN1 and the high-level NOR signal SN2 output from the NOR gates N1 and N2 respectively connect the terminal 5a to the power supply 7 via the relay 9 and the terminal 11 via the relay 11. 5b is grounded, and the motor 5 rotates in the forward direction in which the window opens.

Further, when the close switch 3 is operated during normal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a high level operation signal S1 and a low level operation signal S3, as shown in FIG. Then, the microcomputer 14 outputs a low level drive signal S10 and a high level drive signal S12, respectively. Then, the low level inversion signal R1
AND gate A1 to which high level inversion signal R23 is input outputs low level AND signal SA1, high level inversion signal R3 and low level inversion signal R23.
The AND gate A3 to which is input also outputs the low-level AND signal SA3. On the other hand, the AND gates A2 and A4, to which the high level reset signal S15 is input, output the low level logical product signal SA2 and the high level logical product signal SA4, which are the same as the drive signals S10 and S12, respectively.

Therefore, the logical product signal SA1 and the logical product signal S
Since both A2 are at low level, NOR gate N
The NOR signal SN1 outputted by 1 is at a high level, while the AND signal SA3 is at a low level and the AND signal SA4 is at a high level, the NOR signal N2 output by the NOR gate N2 is at a low level. It becomes a level. Then, by the high-level NOR signal SN1 and the low-level NOR signal SN2 output from the NOR gates N1 and N2, respectively, the terminal 5a is passed through the relay 9.
Is grounded, and the terminal 5b is connected to the power source 7 via the relay 11, so that the motor 5 rotates in the reverse rotation direction in which the window is closed.

Further, during the normal operation of the microcomputer 14, both the opening and closing switches 1 and 3 are not operated,
When 3 outputs high-level operation signals S1 and S3, respectively, the microcomputer 14 outputs low-level drive signals S10 and S12, respectively, as shown in FIG. And
AND to which low level inversion signals R1 and R23 are input
The gate A1 outputs a low-level AND signal SA1, and the low-level inverted signals R3 and R23 are input to the gate A1.
The ND gate A3 also outputs a low-level AND signal SA3. On the other hand, the AND gates A2 and A4 to which the high-level reset signal S15 is input are driven by the drive signals S10 and S.
12 and the low-level logical product signals SA2 and S, respectively.
Output A4.

Therefore, the logical product signal SA1 and the logical product signal S
Since both A2 are at low level, NOR gate N
The NOR signal SN1 output by 1 is at a high level, and since the AND signal SA3 and the AND signal SA4 are both at a low level, the NOR signal SN2 output by the NOR gate N2 is also at a high level. . And
By the high-level NOR signals SN1 and SN2 output from the NOR gates N1 and N2, respectively, the relays 9 and 1
The terminals 5a and 5b are both grounded via
Stops.

Next, when the operation of the microcomputer 14 becomes abnormal, the level of the reset signal S15 from the reset circuit 15 intermittently changes from the high level to the low level, and the level of the inverted signal R23 of the reset signal S15 is intermittent. It changes from low level to high level and the microcomputer 1
The drive signals S10 and S12 from 4 are fixed to the low level when the open / close switches 1 and 3 are not operated,
As a result, one of the inputs of the AND gates A2 and A4 becomes low level. Therefore, AND gates A2 and A4
Is the other input and is independent of the operation of the open / close switches 1 and 3 that determine the levels of the drive signals S10 and S12.
It outputs low-level AND signals SA2 and SA4, respectively.

When the open switch 1 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a low level operation signal S1 and a high level operation signal S3, as shown in FIG. In addition, while the reset signal S15 from the reset circuit 15 is at the high level, the AND gate A1 to which the high level inversion signal R1 and the low level inversion signal R23 are input is changed to the low level AND signal SA.
The AND gate A3 that outputs 1 and receives the low level inversion signals R3 and R23 also receives the low level AND signal S.
Output A3.

Therefore, when the open switch 1 is operated during the abnormal operation of the microcomputer 14, the reset circuit 15 is operated.
Since the logical product signal SA1 and the logical product signal SA2 are both at a low level while the reset signal S15 from is high level, the NOR signal SN1 output from the NOR gate N1 is at a high level, and the logical product is Since both the signal SA3 and the logical product signal SA4 are at low level, N
The NOR signal SN2 output from the OR gate N2 also becomes high level. Then, high-level NOR signals SN1 and SN output from the NOR gates N1 and N2, respectively.
2, the terminals 5a and 5b are both grounded via the relays 9 and 11, and the motor 5 stops.

Further, when the close switch 3 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a high level operation signal S1 and a low level operation signal S3, respectively, as shown in FIG. Further, while the reset signal S15 from the reset circuit 15 is at the high level, the AND gate A1 to which the low level inversion signals R1 and R23 are input outputs the low level AND signal SA1 and the high level inversion signal R3. The AND gate A3 to which the low level inversion signal R23 is input also receives the low level AND signal SA3.
Is output.

Therefore, when the close switch 3 is operated during the abnormal operation of the microcomputer 14, the reset circuit 15
Since the logical product signals SA1 to SA4 are all at the low level while the reset signal S15 from is high level, the negative logic output from the NOR gates N1 and N2 is the same as when the open switch 1 is operated. Sum signal SN1, SN
2 becomes high level respectively. Then, the high-level NOR signals SN1 and SN2 output from the NOR gates N1 and N2 respectively ground the terminals 5a and 5b through the relays 9 and 11, and the motor 5 stops.

Further, during the abnormal operation of the microcomputer 14, both the opening and closing switches 1 and 3 are not operated and the switches 1 and 3 are not operated.
3 outputs high-level operation signals S1 and S3, respectively, as shown in FIG. 7, while the reset signal S15 from the reset circuit 15 is at high level, the low-level inversion signals R1 and R23 are input. A1 outputs the low-level logical product signal SA1, and the AND gate A3 to which the low-level inverted signals R3 and R23 are input also outputs the low-level logical product signal SA3.

Therefore, the logical product signal SA1 to the logical product signal SA1 is obtained when the open / close switches 1 and 3 are not operated during the abnormal operation of the microcomputer 14 and the reset signal S15 from the reset circuit 15 is at the high level. Since the signal SA4 is all low level, the open switch 1 and the close switch 3
Similarly to the operation of, the NOR gates SN1 and SN2 output from the NOR gates N1 and N2 respectively become high level. Then, the high-level NOR signals SN1 and SN2 output from the NOR gates N1 and N2 respectively ground the terminals 5a and 5b through the relays 9 and 11, and the motor 5 stops.

On the other hand, when the open switch 1 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs the low level operation signal S1 and the high level operation signal S3, as shown in FIG. In addition, while the reset signal S15 from the reset circuit 15 is at the low level, the high-level inverted signals R1 and R23 are input to the AND gate A1.
Outputs a high-level AND signal SA1, and the AND gate A3 to which the low-level inversion signal R3 and the high-level inversion signal R23 are input, changes to the low-level AND signal S
Output A3.

Therefore, when the open switch 1 is operated during the abnormal operation of the microcomputer 14, and the reset circuit 15 is operated.
Since the logical product signal SA1 is at a high level and the logical product signal SA2 is at a low level while the reset signal S15 is low level, the NOR gate signal SN1 output from the NOR gate N1 is at a low level. Since both the logical product signal SA3 and the logical product signal SA4 are at low level, the NOR signal SN2 output from the NOR gate N2 is at high level. And NOR gate N
1 and N2 respectively output a low-level NOR signal SN1 and a high-level NOR signal SN2,
The terminal 5a is connected to the power supply 7 via the relay 9, and the terminal 5b is grounded via the relay 11, so that the motor 5 rotates in the forward direction in which the window opens.

Further, when the close switch 3 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a high level operation signal S1 and a low level operation signal S3, as shown in FIG. Further, while the reset signal S15 from the reset circuit 15 is at the low level, the AND gate A1 to which the low level inversion signal R1 and the high level inversion signal R23 are input is changed to the low level AND signal SA1.
And an AND gate A3 to which the high level inversion signals R1 and R23 are input,
3 is output.

Therefore, when the close switch 3 is operated during the abnormal operation of the microcomputer 14, the reset circuit 15 is operated.
Since the logical product signal SA1 and the logical product signal SA2 are both at a low level while the reset signal S15 from is low level, the NOR signal SN1 output from the NOR gate N1 is at a high level, while the logical product is Since the signal SA3 is at high level and the logical product signal SA4 is at low level, the NOR signal SN2 output from the NOR gate N2 is at low level. And NOR gate N
1 and N2 respectively output a high-level NOR signal SN1 and a low-level NOR signal SN2,
The terminal 5a is grounded via the relay 9, and the terminal 5b is connected to the power source 7 via the relay 11, so that the motor 5 rotates in the reverse direction in which the window is closed.

Further, during the abnormal operation of the microcomputer 14, both the opening and closing switches 1 and 3 are not operated and the switches 1 and 3 are not operated.
3 outputs the high-level operation signals S1 and S3, respectively, as shown in FIG. 10, while the reset signal S15 from the reset circuit 15 is at the low level, the low-level inversion signal R1 and the high-level inversion signal R23 are generated. A input
The ND gate A1 outputs a low level AND signal SA1, and the AND gate A3 to which the low level inversion signal R3 and the high level inversion signal R23 are input also outputs a low level AND signal SA3.

For this reason, the logical product signals SA1 to logical product are obtained when the open / close switches 1 and 3 are not operated during abnormal operation of the microcomputer 14 and the reset signal S15 from the reset circuit 15 is at a low level. Since all the signals SA4 are low level, the NOR signals SN1 and SN2 output from the NOR gates N1 and N2 respectively become high level. The high-level NOR signals SN1 and SN2 output from the NOR gates N1 and N2, respectively.
As a result, the terminals 5a and 5b are both grounded via the relays 9 and 11, and the motor 5 is stopped.

The watchdog pulse WP when the microcomputer 14 shifts from the normal operating state to the abnormal operating state,
The reset signal S15, the operation signal S1 (S3) associated with the operation of the open (close) switch 1 (3), and the variation of each level of the voltage applied to the motor 5 are shown in the timing chart of FIG. Shown in stages 1 to 4.

Further, in the power window device of this embodiment, when the levels of the operation signals S1 and S3 and the level of the detection signal S17 of the current detecting section 17 become a predetermined pattern during the normal operation of the microcomputer 14. Assuming that a foreign object (not shown) is sandwiched between the window frame (not shown) and the window, the drive signal S10 output from the microcomputer 14 is unconditionally output regardless of the operation of the open switch 1 and the close switch 3.
Becomes low level and the drive signal S12 becomes high level. As a result, the motor 5 rotates in the forward direction and the window is forcibly opened.

Further, in the power window device of this embodiment, when the level of the detection signal S19 from the limit switch 19 changes from the high level to the low level during the normal operation of the microcomputer 14, the window is fully closed. Assuming that the position has been reached, the detection signal S17 of the current detector 17
Even if the level becomes the predetermined pattern, the above-described operation of unconditionally setting the level of the drive signal S10 output from the microcomputer 14 to the low level and unconditionally setting the drive signal S12 to the high level is performed. Not performed. As a result, when the window reaches the fully closed position, the motor 5 is rotated in the forward rotation direction, the window is forcibly opened, and the window is prevented from closing.

As described above, according to the power window device of this embodiment, the drive signals S10 and S1 for rotating the motor 5 forward and backward in response to the operation of the open / close switches 1 and 3.
The microcomputer 14 that outputs 2 and the relays 9 and 11 that change the connection polarity of the motor 5 to the power supply 7
In response to the level of the low-active reset signal S15 intermittently output by the reset circuit 15 at the time of abnormality, the inversion signals R1 and R3 obtained by inverting the operation signals S1 and S3 from the open / close switches 1 and 3, and the microcomputer 14 The signal selection circuit 21 for selecting one of the drive signals S10 and S12 from the drive signal S1 is provided, and when the reset signal S15 is at a low level, the inverted signals R1 and R1 selected by the signal selection circuit 21 are provided.
The motor 5 is driven based on 3 and the motor 5 is driven based on the drive signals S10 and S12 selected by the signal selection circuit 21 when the reset signal S15 is at a high level.

Therefore, when an abnormality occurs, the microcomputer 14
Even if the drive signals S10 and S12 cannot be output, the reset circuit 15 is operated by operating the open / close switches 1 and 3.
While the reset signal S15 from the
The window can be opened and closed by intermittently rotating the window forward and backward, and it can be prevented that the window cannot be opened or closed when the microcomputer 14 is abnormal.

By the way, in the above-described power window device of the first embodiment, when the microcomputer 5 is operated abnormally to open and close the window by operating the open / close switches 1 and 3, the motor 5 is rotated in the forward and reverse directions. Only when the reset signal R15 whose high and low levels change is low level, the inversion signals R1 and R of the operation signals S1 and S3 from the open / close switches 1 and 3 are generated.
Since 3 is effective, opening and closing of the window in this case is an intermittent operation in synchronization with the timing when the reset signal S15 becomes low level. Such an intermittent operation is performed by the microcomputer 1
Since 4 is in abnormal operation, it is important to close the window by operating the closing switch 3 with an emphasis on the fact that it is no longer able to perform the function of detecting and canceling the trapping of foreign matter that is being performed during normal operation. This is a very advantageous operation in that the operator (not shown) of the open / close switches 1 and 3 needs to be alerted so that the possibility of pinching is reduced as much as possible.

On the other hand, however, if the forward and reverse rotation of the motor 5 becomes intermittent, the reality is that the speed of opening and closing the window is affected accordingly. Therefore, the second aspect of the present invention, which prioritizes the speed of opening and closing the window during abnormal operation of the microcomputer 14,
A power window device according to an embodiment will be described with reference to FIGS. 12 to 19.

FIG. 12 is a circuit diagram showing a schematic structure of the power window device according to the second embodiment, and the first structure shown in FIG.
The same members and parts as the power window device of the embodiment are
Description will be given by attaching the same reference numerals as those given in FIG.

The power window device of the second embodiment shown in FIG. 12 is similar to the power window device of the first embodiment in that the open switch 1, the close switch 3, the motor 5, the power supply 7, the relays 9 and 11 and the trapping detection operation. And a reset circuit 1 for monitoring the operation of the microcomputer 14, which performs a release operation
5, a signal selection circuit 21 including a logic circuit group for selecting signals from the open / close switches 1 and 3 and the microcomputer 14, a motor 5
Current detection unit 17 for load detection, limit switch 19 for fully open position detection of window (not shown), NOT
It includes a gate T23 and a timer circuit 25 not provided in the power window device of the first embodiment.

In the power window device of this embodiment, the watchdog pulse WP input to the reset circuit 15 from the microcomputer 14 in the power window device of the first embodiment is also input to the timer circuit 25, and this timer The time-up signal S25 output by the circuit 25 is
The reset signal S15 from the reset circuit 15 is set to NO.
The power window device of the first embodiment is different from the power window device of the first embodiment in that one of the AND gates A1 and A3 in the signal selection circuit 21 is input instead of the inverted signal R23 inverted by the T gate T23. Further, in the power window device of the present embodiment, in the power window device of the first embodiment, the AND gates A2 and A4 in the signal selection circuit 21 which receives the reset signal S15 as one input are replaced with the reset signal S15. The time-up signal S2
Inversion signal R2 obtained by inverting 5 by the NOT gate T23
The point that 3A is input is different from the power window device of the first embodiment.

The timer circuit 25 provided in the power window device of the present embodiment is composed of, for example, an IC as with the reset circuit 15, and when the watchdog pulse WP rises from a low level to a high level, and a high level. The watchdog pulse W
When P next rises or falls, the timer circuit 25 is configured to reset the time count at that time.

Then, the microcomputer 14 shifts from the normal operating state to the abnormal operating state and before the next rising or falling of the watchdog pulse WP occurs, the first stage in the timing chart of FIG. As shown in FIG. 13, when the time count of the predetermined time is up, the timer circuit 25 changes the level of the time-up signal S25 output from itself from low level to high level, as shown in the fourth stage in FIG. To launch. The time-up signal S25 is lowered from the high level to the low level by the timer circuit 25 when the watchdog pulse WP next rises or falls.

Next, the operation (action) of the power window device of this embodiment constructed as described above will be explained.
First, while the microcomputer 14 is operating normally, the level of the time-up signal S25 from the timer circuit 25 becomes low and the level of the inverted signal R23A of the time-up signal S25 becomes high.

Therefore, when the open switch 1 is operated during normal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a low level operation signal S1 and a high level operation signal S3, as shown in FIG. As described above, the microcomputer 14 drives the high-level drive signal S10 and the low-level drive signal S
12 is output. Then, the AND gate A1 to which the high level inversion signal R1 and the low level time-up signal S25 are input is the low level AND signal SA.
AND gate A3 which outputs 1 and receives the low level inversion signal R3 and the low level time-up signal S25
Also outputs a low-level AND signal SA3. on the other hand,
The AND gates A2 and A4, to which the high level inversion signal R23A is input, output the high level logical product signal SA2 and the low level logical product signal SA4, which are the same as the drive signals S10 and S12, respectively.

Therefore, since the logical product signal SA1 is low level and the logical product signal SA2 is high level, N
The NOR gate signal SN1 output from the OR gate N1 is at a low level, while the AND signals SA3 and SA4 are both at a low level, the NOR gate signal SN2 output from the NOR gate N2 is at a high level. And
The low-level NOR signal SN1 and the high-level NOR signal SN2 output from the NOR gates N1 and N2 respectively connect the terminal 5a to the power supply 7 via the relay 9 and the terminal 11 via the relay 11. 5b is grounded, and the motor 5 rotates in the forward direction in which the window opens.

Further, when the closing switch 3 is operated during normal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a high level operation signal S1 and a low level operation signal S3, as shown in FIG. Then, the microcomputer 14 drives the low-level drive signal S10 and the high-level drive signal S12.
Are output respectively. Then, the low level inversion signal R
The AND gate A1 to which 1 and the low-level time-up signal S25 are input outputs the low-level AND signal SA1, and the AND-gate A3 to which the high-level inverted signal R3 and the low-level time-up signal S25 are input. Also,
It outputs a low-level AND signal SA3. On the other hand, the AND gate A to which the high-level inverted signal R23A is input
2 and A4 output a low-level AND signal SA2 and a high-level AND signal SA4, which are the same as the drive signals S10 and S12, respectively.

Therefore, the logical product signal SA1 and the logical product signal S
Since both A2 are at low level, NOR gate N
The NOR signal SN1 outputted by 1 is at a high level, while the AND signal SA3 is at a low level and the AND signal SA4 is at a high level, the NOR signal N2 output by the NOR gate N2 is at a low level. It becomes a level. Then, by the high-level NOR signal SN1 and the low-level NOR signal SN2 output from the NOR gates N1 and N2, respectively, the terminal 5a is passed through the relay 9.
Is grounded, and the terminal 5b is connected to the power source 7 via the relay 11, so that the motor 5 rotates in the reverse rotation direction in which the window is closed.

Furthermore, during normal operation of the microcomputer 14, both the open and close switches 1 and 3 are not operated,
When 3 outputs high-level operation signals S1 and S3, respectively, the microcomputer 14 outputs low-level drive signals S10 and S12, respectively, as shown in FIG. Then, the AND gate A1 to which the low-level inverted signal R1 and the low-level time-up signal S25 are input outputs the low-level AND signal SA1, and the low-level inverted signal R3 and the low-level time-up signal S25. AND gate A3 to which is also input is low-level AND signal S
Output A3. On the other hand, the high level inversion signal R23A
Is input to the AND gates A2 and A4.
0 and S12, which are low-level AND signals SA, respectively
2, SA4 is output.

Therefore, since the logical product signals SA1 to SA4 are all at the low level, the NOR gates SN1 and SN2 output from the NOR gates N1 and N2 are at the high level. And NOR gate N
Terminals 5a and 5b are both grounded via relays 9 and 11 by high-level NOR signals SN1 and SN2 respectively output from terminals 1 and N2, and motor 5 is stopped.

Next, the timer is started at the time when the operation of the microcomputer 14 becomes abnormal and the watchdog pulse WP rises from a low level to a high level and when it falls from a high level to a low level. When the time count of the predetermined time by the circuit 25 is up, the time-up signal S2 output by the timer circuit 25 is output.
Level 5 rises from low to high,
The inverted signal R23A changes to low level. At the same time, the drive signals S10 and S12 from the microcomputer 14 are fixed to a low level when the open / close switches 1 and 3 are not operated, whereby one of the inputs of the AND gates A2 and A4 is at a low level. Becomes Therefore, the AND gates A2 and A4 are the other inputs and drive signals S10,
Regardless of the operation of the open / close switches 1 and 3 that determine the level of S12, the low-level AND signals SA2 and SA4, which are the same as the level of the inverted signal R23A, are output.

When the open switch 1 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a low level operation signal S1 and a high level operation signal S3, as shown in FIG. And the AND gate A1 to which the high level inversion signal R1 and the high level time-up signal S25 are input is a high level AND signal SA.
AND gate A3 which outputs 1 and receives the low level inversion signal R3 and the high level time-up signal S25
Outputs a low-level AND signal SA3.

Therefore, when the open switch 1 is operated during the abnormal operation of the microcomputer 14, since the logical product signal SA1 is at the high level and the logical product signal SA2 is at the low level, the NOR operation output from the NOR gate N1 is performed. Signal S
N2 is at a low level, while both the logical product signal SA3 and the logical product signal SA4 are at a low level, so NO
The NOR signal SN2 output from the R gate N2 becomes high level. The low-level NOR signal SN1 and the high-level NOR signal SN2 output from the NOR gates N1 and N2 respectively connect the terminal 5a to the power source 7 via the relay 9 and the relay 11. The terminal 5b is grounded, and the motor 5 rotates in the forward direction in which the window opens.

When the closing switch 3 is operated during abnormal operation of the microcomputer 14 and each of the open / close switches 1 and 3 outputs a high-level operation signal S1 and a low-level operation signal S3, as shown in FIG. The AND gate A1 to which the low level inversion signal R1 and the high level time-up signal S25 are input to the
AND gate A3 which outputs 1 and receives the high level inversion signal R3 and the high level time-up signal S25
Outputs a high-level AND signal SA3.

Therefore, when the closing switch 3 is operated during the abnormal operation of the microcomputer 14, both the logical product signal SA1 and the logical product signal SA2 are at the low level.
The NOR signal SN1 output from the R gate N1 is at a high level, while the logical product signal SA3 is at a high level and the logical product signal SA4 is at a low level.
The NOR signal SN2 output from the R gate N2 becomes low level. The high-level NOR signal SN1 and the low-level NOR signal SN2 output from the NOR gates N1 and N2 ground the terminal 5a via the relay 9 and the terminal 5b via the relay 11. Is connected to the power supply 7, and the motor 5 rotates in the reverse direction in which the window is closed.

Further, during the abnormal operation of the microcomputer 14, both the opening and closing switches 1 and 3 are not operated, and the switches 1 and 3 are not operated.
3 outputs high-level operation signals S1 and S3, respectively, as shown in FIG. 19, a low-level inverted signal R1
And the high-level time-up signal S25 is input A
The ND gate A1 outputs a low-level logical product signal SA1, and the AND gate A3 to which the low-level inverted signal R3 and the high-level time-up signal S25 are input also outputs the low-level logical product signal SA3.

Therefore, when the open / close switches 1 and 3 are not operated during the abnormal operation of the microcomputer 14, since the logical product signals SA1 to SA4 are all at the low level, the NOR gates N1 and N2 output. The NOR signals SN1 and SN2 are set to high level. Then, the high-level NOR signals SN1 and SN2 output from the NOR gates N1 and N2 respectively ground the terminals 5a and 5b through the relays 9 and 11, and the motor 5 stops.

The second in the timing chart of FIG.
The third stage, the fifth stage, and the fifth stage are the reset signal S15 and the operation signal S1 (in response to the operation of the open (close) switch 1 (3) when the microcomputer 14 shifts from the normal operating state to the abnormal operating state. S3) and the state of fluctuation of each level of the voltage applied to the motor 5 are shown.

Further, in the power window device of the present embodiment, like the power window device of the first embodiment, during the normal operation of the microcomputer 14, the operation signals S1, S
When the level of 3 and the level of the detection signal S17 of the current detector 17 become a predetermined pattern, it is assumed that a foreign object (not shown) is sandwiched between the window frame (not shown) and the window, and the open switch 1 and The drive signal S10 output from the microcomputer 14 becomes low level and the drive signal S12 becomes high level unconditionally regardless of the operation of the closing switch 3. As a result, the motor 5 rotates in the forward direction and the window is forcibly opened.

Further, in the power window device of this embodiment, when the level of the detection signal S19 from the limit switch 19 changes from the high level to the low level during the normal operation of the microcomputer 14, the window is fully closed. Assuming that the position has been reached, the detection signal S17 of the current detector 17
Even if the level becomes the predetermined pattern, the above-described operation of unconditionally setting the level of the drive signal S10 output from the microcomputer 14 to the low level and unconditionally setting the drive signal S12 to the high level is performed. Not performed. As a result, when the window reaches the fully closed position, the motor 5 is rotated in the forward rotation direction, the window is forcibly opened, and the window is prevented from closing.

Also in the power window device of this embodiment described above, the microcomputer 14 causes the drive signal S1 to be generated due to the occurrence of an abnormality as in the power window device of the first embodiment.
Open / close switch 1,
By operating 3, it is possible to open / close the window by rotating the motor 5 in the forward / reverse direction while the time-up signal S25 from the timer circuit 25 is at a high level. Can be prevented.

In the power window device of the second embodiment described above, the level of the watchdog pulse WP falls from the high level to the low level after the time count of a predetermined time is finished during the abnormal operation of the microcomputer 14. Until the time-up signal S2 from the timer circuit 25
5 becomes high level continuously. Therefore, when the windows are opened and closed by operating the open / close switches 1 and 3 to rotate the motor 5 in the forward / reverse direction, the open / close switches 1 and 3 are operated while the time-up signal S25 whose level continuously changes is at the high level. To make the inversion signals R1 and R3 of the operation signals S1 and S3 valid, and to make the window open / close as a continuous operation during the operation of the open / close switches 1 and 3 to be the same quick operation as during the normal operation of the microcomputer 14. You can

In both of the above-mentioned embodiments, the operation signals S1 and S3 become low level when each of the switches 1 and 3 for opening and closing is operated, and the corresponding drive signal S10 from the microcomputer 14 is generated.
Although S12 is set to the high level, the level of each signal can be arbitrarily set according to the configuration of the relays 9 and 11, and similarly, the logic circuit that constitutes the signal selection circuit 21 operates as described above. Signals S1 and S3 and drive signals S10 and S1
It is needless to say that it is possible to arbitrarily select 2 according to the configuration of the relays 9 and 11 and the like, and is not limited to the configurations shown in the first and second embodiments.

[0081]

As described above, according to the present invention, the drive signal generation for generating and outputting the drive signal for opening and closing the window based on the operation signal from the opening / closing switch while outputting the watchdog pulse during the normal operation. Means and a reset circuit that monitors the watchdog pulse and outputs a reset signal for operation reset to the drive signal generation means when the drive signal generation means abnormally operates, and drives the motor by the drive signal. A power window device for opening and closing a window, which is connected to the open / close switch and the drive signal generating means, selectively outputs the operation signal while outputting the reset signal, and outputs the drive signal while the output of the reset signal is stopped. A signal selection circuit for selectively outputting the signal, and the mode is selected by the signal selected by the signal selection circuit from the drive signal and the operation signal. It was configured to be driven.

Therefore, a power window in which a microcomputer is interposed between the opening / closing switch and the motor is provided so that the motor for opening / closing the window can be driven in addition to the operation of the opening / closing switch such as the detection and release operation of foreign matter. In the device, based on the output of the reset signal from the reset circuit that monitors the watchdog pulse when the abnormal operation of the drive signal generation means is detected, even when the microcomputer malfunctions,
Since the window opening / closing motor is driven by the operation signal from the open / close switch instead of the drive signal from the drive signal generating means, even if the drive signal generating means stops outputting the drive signal due to an abnormal operation, the opening / closing operation is performed. There is an effect that the window can be surely opened and closed by the switch.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of a power window device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit according to the operation of the open switch during normal operation of the microcomputer of FIG.

FIG. 3 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit according to the operation of the close switch when the microcomputer of FIG. 1 operates normally.

FIG. 4 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the open / close switch is not operated during normal operation of the microcomputer of FIG. 1;

5 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit in accordance with the operation of the open switch when the microcomputer of FIG. 1 is abnormally operated and the reset signal is in a high level state. is there.

6 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit in accordance with the operation of the close switch when the microcomputer of FIG. 1 is abnormally operated and the reset signal is in a high level state. is there.

7 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the microcomputer of FIG. 1 is abnormally operated and the open / close switch is not operated when the reset signal is in a high level state. Is.

8 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the open switch is operated when the reset signal is in a low level state during abnormal operation of the microcomputer of FIG. 1; is there.

9 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the closing switch is operated when the microcomputer of FIG. 1 is abnormally operated and the reset signal is in a low level state. is there.

10 is an explanatory diagram of a truth value indicating the level of a signal output by each logic circuit of the signal selection circuit when the microcomputer of FIG. 1 is in an abnormal operation and the open / close switch is not operated when the reset signal is at a low level. Is.

FIG. 11 shows each of a watchdog pulse, a reset signal, an operation signal associated with the operation of an open (close) switch, and a voltage applied to a motor when the microcomputer of FIG. 1 shifts from a normal operation state to an abnormal operation state. 7 is a timing chart showing how the level changes.

FIG. 12 is a circuit diagram showing a schematic configuration of a power window device according to a second embodiment of the invention.

13 is a watchdog pulse when the microcomputer of FIG. 12 shifts from a normal operation state to an abnormal operation state, a reset signal, an operation signal associated with the operation of an open (close) switch, a time-up signal, and a voltage applied to the motor. 3 is a timing chart showing how each level of voltage varies according to the voltage.

FIG. 14 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit in accordance with the operation of the open switch when the microcomputer of FIG. 12 operates normally.

FIG. 15 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit according to the operation of the close switch when the microcomputer of FIG. 12 operates normally.

16 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the open / close switch is not operated during normal operation of the microcomputer of FIG. 12;

FIG. 17 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the open switch is operated during abnormal operation of the microcomputer of FIG.

18 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit in accordance with the operation of the close switch when the microcomputer of FIG. 12 operates abnormally.

FIG. 19 is an explanatory diagram of a truth value indicating a level of a signal output from each logic circuit of the signal selection circuit when the open / close switch is not operated during abnormal operation of the microcomputer of FIG. 12;

FIG. 20 is a circuit diagram showing a schematic configuration of a power window device according to a conventional example.

[Explanation of reference numerals] 1 open switch 3 close switch 5 motor 14 microcomputer (driving signal generating means) 15 reset circuit 21 signal selection circuit 25 timer circuit S1, S3 operation signal S10, S12 driving signal S15 reset signal S25 time-up signal WP Watchdog pulse

Claims (2)

[Claims] 1. A drive signal generating means for generating and outputting a drive signal for opening and closing a window on the basis of an operation signal from an opening / closing switch while outputting a watchdog pulse during normal operation, and monitoring the watchdog pulse, A power window device comprising: a reset circuit that outputs a reset signal for operation reset to the drive signal generation means when the drive signal generation means abnormally operates, and drives a motor by the drive signal to open and close a window. A signal selection circuit that is connected to the open / close switch and the drive signal generation means, selectively outputs the operation signal during output of the reset signal, and selectively outputs the drive signal during stop of output of the reset signal, The motor is driven by a signal selected and output by the signal selection circuit from the drive signal and the operation signal. And power window equipment. 2. A time-up signal is output to the signal selection circuit when the time count of a predetermined time is up, the time count is reset by detection of the watchdog pulse, and output of the time-up signal is stopped. The power window device according to claim 1, further comprising: a timer circuit, wherein the signal selection circuit selects one of the drive signal and the operation signal depending on whether the time-up signal is input.