JP2003125596A - Driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver (e.g. a power window driver in a vehicle) in which a fail-safe function against such an abnormality as a motor 2 operates freely is realized at a low cost, and a fail state where the fail-safe function operates is released automatically when an abnormality is released. SOLUTION: When an abnormality detection signal is inputted to a CPU 11a and the CPU 11a detects an abnormality, a fail state where conduction control of two relay coils 15 and 16 is the drive circuit 14 of a motor 2 is performed forcibly is brought about in order to stop the motor 2 forcibly by operating both relay coils. After the fail state is brought about, the forced conduction control is interrupted temporarily as required and a decision is made whether the abnormality is present or not. If the abnormality is not detected, fail reset control for releasing the fail state is executed (steps S1-S5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for driving a motor for opening and closing a window of a vehicle, etc., even when a failure occurs due to an abnormal operation of the motor.
The present invention relates to a drive device that automatically releases the fail state if the abnormality is resolved.

[0002]

2. Description of the Related Art Generally, as a control system for an opening / closing mechanism such as a power window of a vehicle (particularly, a driver's seat window), an electronic control for realizing an automatic reversing function of a window (a trapping prevention function) or the like has become mainstream. Therefore, as a drive device that appropriately supplies power to the motor that is the drive source of the opening / closing mechanism to control its operation, a drive system using a relay is adopted, and a microcomputer (hereinafter referred to as a microcomputer) is used.
The one having a control circuit including is generally used. Hereinafter, an example of a system (power window system) including this type of drive device will be described with reference to FIG.

(Main Structure of Power Window) First, an outline of a main structure of the power window will be described. Figure 5
As shown in FIG. 1, for example, a motor 2 is provided inside the door 1 of the vehicle, and the rotation of the output shaft of the motor 2 is carried by a carrier plate (a movable portion) that supports the window glass 3 (movable portion) by a transmission means (not shown). When the motor 2 operates in one direction, the window glass 3 is closed (that is, it operates in the ascending direction), and when the motor 2 operates in the other direction, the window glass 3 is converted.
Is configured to open (that is, operate in the descending direction), for example. Here, the motor 2 is usually a DC motor, and the motor 2 is provided with a pulse generator 4 that outputs a pulse signal at a cycle inversely proportional to its operating speed.

(Structure of Driving Device) Next, an example of the basic structure of the control unit 10 which is a driving device for controlling the power window will be described. The control unit 10 of this example is
As shown in FIG. 5, the control circuit 11 and the motor drive circuit 1
4 and so on. Here, the control circuit 11 is a circuit including a microcomputer that controls the motor 2 for driving the window in accordance with the input signals from the sensors and the operation switches, and corresponds to the control means of the present invention. This control circuit 11 has a CP
It has a U11a, and is also provided with a memory (not shown) such as a ROM or a RAM for storing or temporarily storing operation programs and various setting values, or an interface (not shown) for inputting / outputting signals. In addition, a power supply circuit 11b that generates a predetermined voltage (for example, 5V) and supplies it to the CPU 11a and the like, and a reset circuit 11c that detects a decrease in the output voltage of the power supply circuit 11b and inputs a reset signal to the CPU 11a are provided. Even if the ignition (IG) switch of the vehicle is turned off, the CPU 11a is not reset, and unless the battery voltage of the vehicle is lowered, C
Stored data in the PU 11a and the control circuit 11 (especially information regarding the fail state) is not erased.

Next, the motor drive circuit 14 connects the respective terminals of the motor 2 to the ground side or the high potential power source side (so-called + B potential power source line), and the relays 15 and 16 and the coils 15a of these relays 15 and 16. , 16a have transistors 17 and 18 (switching elements). When the coil 15a of the relay 15 is excited, the contact 15b of the relay 15 is switched from the state in which one terminal of the motor 2 is connected to the ground side to the state in which it is connected to the high potential power source side, and the motor 2 is unidirectional. (In this case, the window glass 3 is closed). When the coil 16a of the relay 16 is excited, the contact 16b of the relay 16 is switched from the state in which the other terminal of the motor 2 is connected to the ground side to the state in which it is connected to the high potential power source side.
The motor 2 operates in the other direction (in this case, the window glass 3 opens).

Further, the output signal of the pulse generator 4 is input to the control circuit 11, so that the rotation amount of the motor 2 (the operation amount of the window glass 3) and the operation speed can be determined. ing. The output signal of the pulse generator 4 is two pulse signals PL having different phases.
SA and PLSB are output, and the control circuit 11 (that is, the CPU 11a) can detect the rotation direction of the motor 2 from the phase relationship of these pulse signals. Further, the control circuit 11 includes an up switch 21, which is an operation switch,
Operation signals of the down switch 22 and the auto switch 23 are input. These operation switches have their contacts actuated according to the operation of an operation unit (not shown) (for example, an operation knob provided on the elbow rest surface of the vehicle door), and in this case, a so-called manual-up operation is performed. Then, only the up switch 21 operates, and when the manual down operation is performed, only the down switch 22 operates.
When a so-called auto-up operation is performed, the up switch 21 and the auto switch 23 are activated, and when an auto-down operation is performed, the down switch 22 and the auto switch 23 are activated.

When only the operation signal of the up switch 21 or the down switch 22 is input, the control circuit 11 operates either one of the transistors 17 and 18 to operate the motor 2 in a predetermined direction. Realize the opening and closing operation of the window glass 3 by manual operation. When an operation signal of the auto switch 23 is input in addition to the above operation signal, the control circuit 11 automatically operates the motor 2 in a predetermined direction until the window glass 3 is fully closed or fully opened. It has a processing function to realize down.

By the way, in the system including the drive device as described above, the operation section does not command the operation of the motor 2 (in other words, the CPU 11a outputs a control signal for driving the transistors 17 and 18). There is a risk that the motor 2 will be driven abnormally even though it is in a non-existent state. For example, if a failure (so-called ON failure) occurs in which the transistor 17 or 18 is not driven due to so-called migration (a so-called ON failure), the motor 2 is driven and the window glass 3 operates without permission even though no control signal is output. There is a possibility that it will end up. Here, the migration refers to a phenomenon in which solder or the like for terminal connection grows and extends due to a slight amount of water remaining during cleaning of the substrate. In addition to the ON failure of the switching element described above, welding of relay contacts, leak current when submerged in water, and the like may be factors that cause the abnormality.

Therefore, particularly in the field where high safety and reliability are required for vehicles, etc.
It is required to provide a fail-safe function for the above abnormality, and as the fail-safe function, a method of forcibly turning on a relay is considered to be low cost. For example, Utility Model Registration Publication No. 25945
No. 73 (Actual Kaihei No. 7-29732) discloses a device for forcibly driving both relays by detecting the above abnormality based on the detection of the terminal voltage of the motor. If you drive both relays, even if only one relay is on due to a failure,
Since both terminals of the motor always have the same potential, the motor drive can be forcibly stopped. Therefore, according to this method, it is not necessary to separately provide a fail relay for shutting off the power supply line when the above-mentioned abnormality occurs, and the fail safe function can be realized at low cost.

[0010]

However, in the drive device having the fail-safe function as described above, no proposal has been made so far regarding the control processing after the fail-safe function is activated and the fail state is reached. Absent. For example, there is no description about this point in the above-mentioned publication. For this reason, the following problems arise when the drive device as described above is put to practical use. That is, when the device is left in the fail state, even if the abnormality is resolved thereafter, the fail state is maintained and the energization control for the forced drive of the relay is maintained, so that the dark current of the device is reduced. It remains unnecessarily increased.
For example, when the output of the pulse generator 4 as shown in FIG. 5 is used to detect an abnormal movement of the motor, the output of the pulse generator 4 may be temporarily erroneously detected due to noise. There is a possibility that the fail-safe function may be activated by mistake, and if such a malfunction occurs, the fail state is maintained even if the output of the pulse generator 4 returns to normal, and the dark current increases. It will remain. For example, in the case of a vehicle, if the dark current of the drive device continues to increase in this way, the battery of the vehicle may run out.

Assuming that the control circuit of the drive device is appropriately reset and the stored information in the fail state is erased each time, if the abnormality is eliminated at the time of this reset, the fail state will result. As a result, the state in which the dark current has increased ends at this point. However, in a field where high safety and reliability are required, such as a vehicle, such a configuration is not allowed, and once a fail state is reached, basically stored information in the fail state is maintained. Therefore, as described above, there is a possibility of causing actual damage such as battery exhaustion. For example, even when the IG switch in the vehicle is operated from on to off or from off to on, power is constantly supplied to the CPU 11a as shown in FIG. 5, and the CPU 11a is not reset. . Therefore, the CPU 11a continues the fail state irrespective of the operation of the IG switch or the like. Therefore, even if the above-mentioned abnormality that has occurred once is eliminated, the forced energization of the relay continues forever and the abnormality is eliminated. Nevertheless, the battery may run out. Therefore, the present invention is a drive device in which a fail-safe function for an abnormality in which a motor operates arbitrarily is realized at low cost.
Moreover, it is an object of the present invention to provide a drive device that automatically cancels the fail state if the abnormality is resolved even after the fail state in which the fail-safe function is activated.

[0012]

A drive device according to the present invention has two relays for supplying electric power to a motor to respectively rotate the motor in a forward direction or a reverse direction, and instruct the operation of the motor in a forward direction or a reverse direction. A drive device for driving one of the two relays to drive a motor in a forward rotation direction or a reverse rotation direction according to the operating state of the operation portion, wherein the operation portion commands the operation of the motor. If it detects an abnormality that the motor is being driven even though it is not in the state, to activate both of the two relays,
A fail state in which at least one coil of the two relays is forcibly energized is controlled, and a control means for maintaining this fail state is provided, wherein the control means is in the fail state and then the forced If necessary, temporarily stop the energization control to determine the presence or absence of the abnormality,
If the abnormality is not detected, the fail state is released, and if the abnormality is detected, the fail recovery control for maintaining the fail state is executed. According to this drive device, the motor drive state is forcibly stopped by placing the two relays in the drive state when the abnormality occurs, so that the fail-safe function when the abnormality occurs can be realized at low cost. Moreover, after the failure state is reached, it is determined by the fail recovery control whether or not the abnormality is resolved, and if it is resolved, the failure state is released (forced energization of the relay is stopped. ). Therefore, the problem that the forced energization of the relay is continued and the dark current of the device continues to be increased forever despite the elimination of the abnormality is solved. In particular, in the case of a drive device for a vehicle, it is possible to prevent the battery of the vehicle from running down due to the continuation of the dark current increase state.

In the fail state, a control signal (control signal for turning on both relays) may be output for forcibly energizing the two relays, but the direction opposite to the direction in which the motor operates arbitrarily is also possible. Alternatively, a control signal for controlling the energization of only the relay that drives the motor (a control signal for turning on only the reverse relay) may be output.
Since the relay in the direction in which the motor actuated arbitrarily is turned on due to a failure, if both of the relays in the opposite direction are controlled to turn on, the forced stop of the motor can be achieved by controlling only the remaining relays in the opposite direction. Because. However, in this case, it is necessary to detect not only that the motor is operating arbitrarily but also the operating direction of the motor. Further, in this case, in the fail recovery control, it is not always necessary to stop the forced energization control (control signal output for turning on only the reverse relay). If the first abnormality is resolved, the relay in the direction in which the motor was operating turns off, so if the relay drive in the reverse direction is maintained, the motor will operate in the reverse direction this time. This is because it is possible to detect that the first abnormality has been resolved by operating in the opposite direction. Further, the control means can be composed of, for example, a control circuit including a microcomputer and a switching element (for example, a transistor) that opens and closes the energization line of each relay coil under the control of this control circuit. Further, the “motor” in the present invention is an actuator that outputs a mechanical driving force in two directions by electric power, and is not limited to a rotary motor, and may be a linear motor, for example. Absent. Further, the "forward rotation" or "reverse rotation" in the present invention means the operation of the "motor" in one direction or the other direction, and is not necessarily limited to the rotational movement in the one direction or the other direction.

Further, in a preferred aspect of the present invention, the control means has a function of detecting and storing a direction in which the motor is driven when the abnormality is detected, and in the fail return control, the direction is set. In contrast to the above, the presence / absence of the abnormality is determined by setting the state in which only the relay on the side driving the motor is energized and controlled. In such a mode, in the fail return control, the motor does not operate unless the abnormality is eliminated, and the phenomenon that the motor temporarily operates in the fail return control does not occur. It is highly advantageous and is particularly advantageous in terms of safety. This is because, in the fail recovery control, the control signals for driving both relays are temporarily turned off, and when the motor operates, it is determined that the abnormality has not been resolved, and the motor operates. If not, it may be determined that the abnormality is resolved. However, since the ON failure of the switching element described above normally does not normally return to the normal state (that is, the case where it is determined that the abnormality has not been eliminated in the fail recovery control is more probabilistic). In many cases), in this case, there is a high possibility that the motor will temporarily operate in the fail recovery control. In other words, while the abnormality is not eliminated and the fail state continues, the motor may operate temporarily every time the fail recovery control is performed, which may impair safety. . On the other hand, in the case of the above-described mode (a mode in which only the reverse relay is energized and controlled to determine whether there is an abnormality), it is determined that the abnormality has been resolved when the motor operates in the reverse direction. If the motor does not operate, it is determined that the abnormality has not been resolved. That is, in the fail recovery control,
If the abnormality is not resolved, the motor will not operate. Therefore, while the abnormality is not eliminated and the fail state continues, the motor does not operate every time the fail recovery control is performed, and high safety is secured.

The motor of the present invention is, for example, a motor for driving a movable part of a vehicle. That is, the drive device of the present invention can be applied to a drive system of some movable part in a vehicle (for example, a power window drive system). If the present invention is applied to a moving part drive system of a vehicle, the moving part of the vehicle (for example, a window) is intended by a driver of the vehicle or the like even when an ON failure of a switching element or an accident such as submersion of the vehicle occurs. It is possible to prevent the malfunction regardless of the above condition with high reliability and contribute to the improvement of the reliability and safety of the vehicle. In addition, as described above, it is possible to reduce the possibility that the battery of the vehicle will run out if the dark current increase state is left. Here, the movable portion of the vehicle may be not only the window of the vehicle but also a sunroof, an automatic sliding door, a power seat, or the like. That is,
INDUSTRIAL APPLICABILITY The present invention can be applied to, for example, a drive device for a power window of a vehicle, or can be applied to a drive device for a sunroof, an automatic sliding door, or the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention applied to a power window of a vehicle will be described below as embodiments of the present invention with reference to the drawings. FIG. 1A is a diagram showing a configuration of a main part of a power window drive device of this example. Figure 1
FIG. 2B and FIG. 2A are flowcharts showing the control processing of the drive device. Further, FIG. 2B is a state transition diagram of the CPU (microcomputer). In addition, FIG.
4C and 4A to 4C are diagrams showing various specific examples of the detection circuit for detecting an abnormality. Note that the basic configuration of this example is the same as the configuration described above shown in FIG. 5, and the same components as those in FIG. 5 are assigned the same reference numerals and overlapping description will be omitted. In this example, as shown in FIG. 1A, the output of the pulse generator 4 shown in FIG. 5 or the output of any of the detection circuits shown in FIG. 3 and FIG. The signal is input to the interrupt port of the CPU 11a. A signal (IG signal) indicating the on / off state of the IG switch of the vehicle is also input to the CPU 11a.

As shown in FIG. 2B, the CPU 1
In the state of 1a, the IG determination state at power-on and the WAIT
There are a mode (sleep state), a standby mode, and an operation mode. Of these, the power-on IG determination state is a state in which the state of the IG switch is determined when the power is turned on (at the time of reset). In this state, if the IG switch is on, the standby mode is entered, and if it is off. Shift to WAIT mode. Note that when the power is turned on (for example, when a new battery is connected for battery replacement), the IG switch is normally off, and therefore the WAIT mode is normally entered. Next, the WAIT mode is a low power consumption mode for suppressing power consumption. In this state, if the IG switch is changed from OFF to ON or an interrupt signal is detected, the microcomputer wakes up and shifts to the standby mode. Next, the standby mode is a state in which the microcomputer wakes up and monitors the state change of each input signal.
The operation mode is a state in which the processing of the routine determined by the change of each input signal is executed and a predetermined signal is output. Incidentally, when shifting to the standby mode, depending on the state change of each input signal, transition to the operation mode or the standby mode,
When the IG switch is turned off, the WAIT mode is entered after a lapse of a predetermined delay time.

Next, the main control processing of the control circuit 11 (CPU 11a) relating to the characteristic part of the present invention will be described. C
In the standby mode or the WAIT mode, the PU 11a (microcomputer) inputs a detection signal for abnormality detection (for example, the output of the pulse generator 4 or the output of the detection circuit as shown in FIGS. 3 to 4) as an interrupt input. When done,
In the case of the WAIT mode, after performing wakeup, a series of processing (routine) shown in FIG. 2A is executed. First, in step S11, the relay control signal (control signal for driving the transistor 17 or 18) is turned off as necessary. Here, both of the control signals of the two relays 15 and 16 may be turned off. However, if the operation direction of the motor 2 (that is, the energization direction) can be detected by the input detection signal, the motor is moved in that direction. It is also possible to turn off only the relay control signal for activating 2 and turn on only the relay control signal in the opposite direction.

Next, in step S12, it is determined whether or not there is an abnormality based on the detection signal. That is, the motor 2 is operating (or is energized) even though both relay control signals are turned off in step S11.
When the detection signal indicating is read, or step S
If the detection signal indicating that the motor 2 is stopped (or in the non-energized state) is read in spite of turning on only the reverse relay control signal in 11, the switching element 15 or It is determined that there is an abnormal state in which 16 ON failure or the like has occurred. Then, if it is determined to be in an abnormal state, the process proceeds to step S13, and in other cases, it is determined to be normal (or a slight ON failure or the like of the switching element has occurred), and this routine is ended.
At this time, if the step S12 is executed in a fail state described later (a state where the compulsory energization of the relay is executed in the step S15 described below) and it is determined to be normal, The routine is terminated after executing the process of stopping the forced energization and canceling the fail state (the process corresponding to the fail recovery control of the present invention).
If an abnormality (for example, ON failure of one relay) is canceled in WAIT mode or the like while executing forced energization to turn on only the reverse relay in the fail state, only the reverse relay is turned on. In this state, the motor 2 is driven in the opposite direction, the detection signal (pulse generator 4) for detecting it is output, and this routine is executed. This is because it is necessary to cancel the fail state with.

The determination of the drive state of the motor 2 in the above step S12 and step S14 described later is performed by, for example, any output PLSA or PLS of the pulse generator 4.
Regarding B, a method of determining that the motor 2 is operating may be used when continuously counting the pulses of the specified count or more. However, in this case, when the window glass 3 is stuck at the fully closed position or the fully open position, the motor 2
Although the motor 2 is driven, the motor 2 is determined to be in a stopped state, so that the driving state of the motor 2 cannot be detected. Therefore, it is preferable that the detection circuit (for example, shown in FIG. 3 to FIG. 4) described later outputs a detection signal indicating the energized state of the motor (state in which the motor is under load) to the motor. 2 is determined to be driven, or this and the pulse generator 4
A desirable mode is one that combines the determination with Further, there is a possibility that the motor is in an overrun state for a predetermined time (for example, about 2 seconds) immediately after the motor 2 is normally operated and stopped, and thus the detection signal is output (that is, the detection signal is not abnormal but is detected). In this case, for example, step S12 may not be performed and it may be determined to be normal (that is, this routine may be terminated).

Next, in step S13, the relay control signal is forcibly turned on (that is, the switches 21 and 22, in order to activate the fail-safe function for the abnormal state).
By turning on the operation signal of No. 23 although it is not input), both relays 15 and 16 are forcibly activated. At this time, both of the control signals for turning on the relays 15 and 16 may be output, but on the side that drives the motor 2 in the direction opposite to the motor operating direction detected by the detection signal input as the interrupt signal. A mode in which a control signal that drives only the relay (a control signal that turns on only the relay in the reverse direction) may be output. Then, in step S14, it is determined based on the detection signal whether or not the driving state of the motor 2 is stopped. Then, if it is stopped, the process proceeds to step S15, the power supply control state in step S13 is maintained as the fail state, and the present routine is ended. On the other hand, if the drive of the motor 2 is not stopped,
Detection signal detection circuit for detecting anomalies (pulse generator 4
(Including the signal input circuit of), the system is reset because a failure or the like is estimated.

According to the processing of FIG. 2A described above,
When the motor 2 is arbitrarily driven due to the ON failure of the transistors 17 and 18, step S11 and subsequent steps are executed by interruption of the detection signal, and it is confirmed in step S12 that the motor 2 is in an abnormal state. The forced energization control of the relay (step S13) is executed, and the fail state is maintained in which the forced energization control is continued (step S15). The steps S13 and S14 may be performed in two steps. That is, after outputting the control signal for turning on only the reverse relay, the process of determining whether or not the motor has stopped (the same process as step S14) is executed, and if stopped, the process proceeds to step S15 and stops. If not, after outputting a control signal for turning on both relays, the process of determining whether or not the motor has stopped is executed again. If stopped, the process proceeds to step S15, and if not stopped, the system is reset. The processing content of performing may be used. By doing this, in the worst case, both relays will be forced to energize and the fail-safe function will be implemented more reliably. In addition, if possible, only the relays in the reverse direction will be energized to perform fail-safe energization. By reducing the number of relays as much as possible, it is possible to minimize the increase in dark current in the fail state.

The CPU 11a (microcomputer) is an IG
If there is a change in the state of the signal (change of the IG switch from on to off or change from off to on), in the standby mode, the WAIT
In case of the mode, after executing wake-up,
The routine shown in (b) (processing routine including fail recovery control) is executed. First, in step S1, it is determined whether or not the relay is in the fail state in which forced energization of the relay is executed. If the fail state is not established, the fail recovery control is unnecessary and this routine is ended.
On the other hand, if it is in the fail state, the process proceeds to step S2, and the relay control signal that has been turned on is turned off as necessary as in step S11 described above. Then, in the next step S3, it is determined based on the detection signal whether or not the abnormality has been resolved. That is, when both the relay control signals are turned off in step S2, but the detection signal indicating that the motor 2 is operating (or in the energized state) is read, or in step S2, the reverse operation is performed. If the detection signal indicating that the motor 2 is stopped (or in the non-energized state) is read even though only the control signal of the directional relay is turned on, the abnormality has not been eliminated. If not, it is determined that the abnormality has been resolved. When it is determined that the abnormality has not been resolved, the process proceeds to step S5, the relay control signal is forcibly turned on to continue the fail state as in step S13, and the abnormality notification control is further performed in step S6. After executing, this routine ends. The abnormality notification control is control for turning on a lamp to notify the user of the vehicle that the vehicle is in an abnormal state. When the process proceeds to step S6, it is estimated that the abnormality is not a temporary one but a definite one, and therefore this is notified to the user. On the other hand, if it is determined in step S3 that the abnormality has been resolved, the fail state is released in step S4, and the compulsory energization control of the relay is stopped. It should be noted that this routine is ended after steps S4 and S6.

According to the control process of FIG. 1 (b) described above, it is determined whether or not the abnormality is resolved after the failure state (steps S2 and S3), and if it is resolved, the step is executed. The fail state is released in S4 (forced energization of the relay is stopped). For this reason, the forced energization of the relay continues even if the abnormality is resolved,
The problem that the battery is exhausted is resolved by the state in which the dark current of the drive device (control unit 10) is increased forever. Further, when the abnormality has not been resolved, the abnormality is notified (step S6), so that the user can recognize the abnormal state early and surely and take appropriate measures such as sending the vehicle for repair early. Becomes Also, in the case of the mode in which only the control signal of the reverse relay is turned on in step S2 and the abnormality determination in step S3 is performed, the motor will not operate unless the abnormality is resolved. There is an advantage that the adverse effect that the motor is temporarily activated does not occur each time the above is performed (that is, each time the IG switch is operated). In this example,
As described above, the fail return control is executed every time the IG switch is operated, but this is for the following reason. First, if a temporary abnormality occurs in the IG switch on state and if this is not resolved when the IG switch is operated from on to off, the dark current will continue to increase in the IG switch off state (vehicle engine stop state). This is because there is a high possibility that the battery will run out. In addition, if a temporary abnormality occurs in the IG switch off state and this is not resolved when the IG switch is operated from off to on, the motor 2 is operated even if the fail state is maintained and the IG switch is turned on.
Is inoperable (the window glass 3 does not operate even if the switches 21 and 22 are operated).

Next, various specific examples of the detection circuit (circuit for detecting the energized state of the motor 2) for detecting abnormality will be described. First, the detection circuit 20a shown in FIG. 3A inputs each terminal voltage of the shunt resistor 21 provided in the energization line of the motor 2 to the comparator 23 via the noise filter 22,
The AND circuit 2 which is turned on when both the output of the comparator 23 and the disenable signal are active
The output of 4 is used as a detection signal. In this case, the comparator 23 activates the output when the potential difference between the terminals of the shunt resistor 21 (the voltage drop of the shunt resistor 21 and the value proportional to the current value of the motor 2) exceeds a specified threshold value. Become. Therefore, when the motor 2 is in a driving state (particularly, the window glass 3 is stuck in the fully open or fully closed position), the detection signal is turned on and the CPU 1
It can be detected that the motor 2 is in a driving state at 1a.
The disenable signal is a signal output under the control of the CPU 11a, for example, and is inactive when the CPU 11a is in the operation mode and active when the CPU 11a is in the WAIT mode or the standby mode. As a result, the interrupt due to the detection signal does not occur during normal operation.

Next, the detection circuit 20b shown in FIG.
Is for inputting each terminal voltage of the one relay 16 (voltage of the common terminal and the normally closed contact terminal) to the comparator 23 via the noise filter 22, and is otherwise similar to the detection circuit 20a. In this case, the comparator 23 activates the output when the potential difference between the terminals of the relay 16 (the voltage drop of the contact resistance of the relay 16 and the value proportional to the current value of the motor 2) exceeds a specified threshold value. become. Therefore, the detection circuit 2
Similar to 0a, the output of the detection circuit 20b can detect that the motor 2 is in a driving state. Next, FIG.
The detection circuit 20c shown in (c) inputs the voltage of the normally closed contact terminal of one relay 16 and the voltage of the coil terminal on the UP side of the motor 2 to the comparator 23 via the noise filter 22, Others are substantially the same as the detection circuit 20a.

Next, the detection circuit 20d shown in FIG.
Is for inputting the voltage of each coil terminal of the motor 2 to the comparator 23a via the noise filter 22.
A motor rotation determination logic circuit 25 is provided on the output side of 3a, and is otherwise similar to the detection circuit 20a. In this case, the comparator 23a has two outputs,
For example, when the potential difference between the coil terminals (the voltage drop of the motor 2 and the value proportional to the current value of the motor 2) exceeds the specified positive threshold value, one output becomes active and the specified negative voltage is applied. Below the threshold, the other output becomes active. Then, the motor rotation determination logic circuit 25 determines whether or not the motor 2 is in the rotation state (more precisely, the drive state) based on each output of the comparator 23a, and activates the output when the motor 2 is in the drive state. Is. Therefore, the output of the detection circuit 20d can also detect that the motor 2 is in the driving state.

Next, the detection circuit 20e shown in FIG.
Has two detection signals (two interrupts), the motor 2
The drive direction of can be detected. In this case, the voltage of each coil terminal of the motor 2 is input to the comparator 23a via the noise filter 22, and two AND circuits 24 are provided on the output side of the comparator 23a. When both the output of the comparator 23a and the disable signal are active, the output of the AND circuit 24 (the detection signal of the one) is turned on, and the output of the other of the comparator 23a and the disable signal are disabled. When both signals are activated, the output of the other AND circuit 24 (the other detection signal) is turned on. With such a detection circuit, one of the detection signals is turned on depending on the driving direction of the motor 2, so that in the CPU 11a,
It is possible to detect that the motor 2 is in a driving state and its driving direction. Next, the detection circuit 20f shown in FIG. 4C is provided with two systems of a noise filter 22 and a comparator 23 for inputting both terminal voltages of the relay coils 15a and 16a, respectively, and inputs the output of each comparator 23. The motor rotation determination logic circuit 25a is provided on the input side of the AND circuit 24. In this case, the output of each comparator 23 becomes active when the potential difference between both terminals of the corresponding relay coil (voltage drop due to the coil resistance of the relay) exceeds a specified threshold value. In addition, the motor rotation determination logic circuit 25a
When one of the outputs of the comparator 23 becomes active, its output (one input of the AND circuit 24) becomes active. Therefore, when the motor 2 is in the driving state, the detection signal (output of the AND circuit 24) is turned on, and the CPU 11a can detect that the motor 2 is in the driving state.

The present invention is not limited to the embodiment described above. For example, the timing at which the fail recovery control is executed is not limited to the time of operating the IG switch in the vehicle or the like, and may be a mode in which the failure recovery control is periodically performed in a predetermined cycle, for example.
Further, the fail recovery control may be performed when switches other than the IG switch in the vehicle are operated (for example, when an accessory (ACC) switch of the vehicle is turned on). If it is executed even when the ACC switch is turned on, it is meaningful in the case of a vehicle type in which the power window can operate with the ACC switch turned on.

[0030]

According to the drive apparatus of the present invention, when an abnormality occurs in which the motor is arbitrarily driven, the two motors are forcedly energized to bring the two relays into the driven state, whereby the motor driven state is forcibly stopped. The fail-safe function when an abnormality occurs can be realized at low cost. Moreover, after the fail state, the fail recovery control
It is determined whether or not the abnormality has been resolved, and if it has been resolved, the fail state is released (forced energization of the relay is stopped). Therefore, the problem that the forced energization of the relay is continued and the dark current of the device continues to be increased forever despite the elimination of the abnormality is solved. In particular, in the case of a drive device for a vehicle, it is possible to prevent the battery of the vehicle from running down due to the continuation of the dark current increase state.

[Brief description of drawings]

FIG. 1 is a diagram showing a main configuration and control processing of a power window drive device.

FIG. 2 is a diagram showing control processing of a power window drive device and state transition of a microcomputer.

FIG. 3 is a diagram showing a detection circuit of a power window drive device.

FIG. 4 is a diagram showing a detection circuit of a power window drive device.

FIG. 5 is a diagram showing a basic configuration of a power window drive device.

[Explanation of symbols]

2 motor 3 Wind glass (moving parts of the vehicle) 4 pulse generator 10 Control unit (driving device) 11 Control circuit (control means) 15,16 relay 17,18 Transistor (switching element)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Setsuura Setsuhiko             Shimogyo-ku, Kyoto-shi Shioji-dori Horikawa Higashiiri Minamifudo-cho             801 OMRON Corporation F-term (reference) 2E052 AA09 CA06 EA14 EA16 EB01                       GA08 GA10 GB13 GB15 GD09                       KA13 LA08                 3D127 AA07 CB00 CC05 DF04 DF33                 5H571 AA03 BB08 CC04 DD00 EE02                       FF01 FF06 FF09 GG04 HA04                       HB01 HC02 HD01 JJ03 JJ26                       LL22 MM02

Claims (3)

[Claims] 1. A motor having two relays for supplying electric power to the motor to rotate the motor in a forward direction or a reverse direction, respectively. A drive device that drives one of the two relays to drive the motor in the forward direction or the reverse direction, wherein the motor does not command the operation of the motor. When an abnormality that is being driven is detected, in order to operate both of the two relays, a fail state in which at least one coil of the two relays is forcibly energized is controlled, and a control for continuing this failure state is performed. After the fail state, the control means temporarily stops the forced energization control as necessary to determine the presence or absence of the abnormality, If not detected the release the fail state, the abnormality drive device and executes a fail-return control to maintain the fail state if it is detected. 2. The control means has a function of detecting and storing a direction in which the motor is driven when the abnormality is detected, and in the fail recovery control, the motor is driven in a direction opposite to the direction. The drive device according to claim 1, wherein the presence or absence of the abnormality is determined in a state in which only the relay on the driving side is energized. 3. The drive device according to claim 1, wherein the motor is a motor for driving a movable portion of a vehicle.