JP3231173B2 - Self-diagnosis device of motor for vehicle equipment and selective drive mechanism of the motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device such as a power window or a power seat mounted on a passenger car or the like, and more particularly, to a self-diagnosis of a locked state, a short circuit, and an open state of a motor used in such a device. And a selective drive mechanism for these motors.

[0002]

2. Description of the Related Art Recently, in passenger cars and the like, a power window in which a passenger can open and close a window by operating a switch, and a power seat in which the position of a seat and the angle of a backrest can be adjusted. (Ie, in-vehicle devices). In such a power window or power seat, a motor using a voltage from a battery mounted on a passenger car as a power supply voltage is used, and the driving of the motor causes the window to open and close and the seat to move.

[0003] By the way, such an in-vehicle apparatus detects an abnormal state due to locking, opening, or short-circuiting of a motor, and stops the motor to release the abnormal state. A diagnostic device is provided.

FIG. 6 is a circuit diagram showing a conventional example of such a self-diagnosis device for a motor for a vehicle-mounted device. This device comprises a motor 1, changeover switches 2 and 3, a motor current detection resistor 4, , A differential amplifier 5 is provided.

In FIG. 1, when the changeover switches 2 and 3 are both closed to the B side, both terminals of the motor 1 are short-circuited via the changeover switches 2 and 3, so that the motor 1 is stopped without power supply. It is in. The switching switch 2 is on the A side,
When the changeover switches 3 are respectively closed to the B side, one terminal of the motor 1 is connected to a battery of a passenger car (not shown) via the changeover switch 2, and the other terminal of the motor 1 is grounded via the changeover switch 3 and the resistor 4. Is done. In this state, the battery voltage + B is applied to the motor 1 via the changeover switch 2, the motor current flows through the changeover switch 2, the motor 1, the changeover switch 3, and the resistor 4, and the motor rotates forward. When the switching switch 2 is closed on the B side and the switching switch 3 is closed on the A side, one terminal of the motor 1 is grounded via the switch 2 and the resistor 4, and the other terminal of the motor 1 is connected to the switch 3 Connected to the battery through. In this state, the battery voltage + B is applied to the motor 1 through the changeover switch 3, the motor current flows through the changeover switch 3, the motor 1, the changeover switch 2, and the resistor 4, and the motor rotates reversely.

The changeover switches 2 and 3 are controlled by a microcomputer (not shown) based on a switch operation by a passenger.

[0007] In any of such motor rotation states, a motor current flows through the resistor 4, and a voltage corresponding to the motor current is generated there. This voltage is amplified by a differential amplifier 5 composed of an operational amplifier. The output voltage of the differential amplifier 5 is converted into a digital value by an A / D converter (not shown) and is taken into a microcomputer (not shown). This microcomputer determines an abnormal state of the motor 1 from such digital values, and based on this determination, the changeover switches 2, 3
Is switched to the B side, and the motor 1 is stopped.

In such a self-diagnosis device, for example, even when an object is caught in the window while the window is being closed, this can be detected.

That is, the motor current I from the start of the motor 1
As shown in FIG. 7, the motor current I suddenly rises at the same time as the start-up, and then a sharply falling rush current occurs. When the motor 1 enters a steady state and the rush current ends, as shown in FIG. When the value becomes a steady value and the window closes and does not move, the motor current I sharply increases.

Therefore, in the self-diagnosis device shown in FIG.
The microcomputer sequentially captures digital value data obtained by A / D converting the output of the differential amplifier 5, and calculates the motor current change rate ΔI / Δt based on the digital value difference ΔI between the two captured data. When ΔI / Δt> K ′ with respect to a predetermined positive value K ′, it is determined that the motor 1 is in the locked state.
The changeover switches 2 and 3 are switched to the B side to stop the motor 1.

As a result, when the window is closed and the motor 1 cannot rotate, the motor current I sharply increases as shown by the solid line in FIG. Can be. Also,
Even when the window is closed and the motor 1 cannot rotate, the motor current suddenly rises as shown by a broken line in FIG. 7, and this can be detected and the motor 1 can be stopped. .

Further, each of the motors of the on-vehicle devices such as the power window and the power seat is provided with two changeover switches so that the rotation can be switched between forward and reverse as described with reference to FIG. ing. FIG.
1 shows an example of a conventional motor selection drive mechanism when two motors are used. This motor selection drive mechanism includes a motor 1a,
1b and changeover switches 2a, 2b, 3a, 3b. Here, a self-diagnosis device for each of the motors 1a and 1b is not shown.

In FIG. 1, the connections between the change-over switches 2a, 2b, 3a, 3b of each of the motors 1a, 1b, the power supply, and the ground terminal are the same as those in FIG.
The self-diagnosis device is not shown. In such a configuration, by switching the changeover switches 2a and 3a, the motor 1a can be rotated forward and reverse or stopped. Similarly, by switching the changeover switch, the motor 1b can be rotated forward and reverse or stopped.

[0014]

In the conventional self-diagnosis apparatus for a motor for a vehicle-mounted apparatus shown in FIG. 6, the operational amplifier constituting the differential amplifier 5 has a battery regardless of whether the motor 1 is operating or not. Is always supplied with power. For this reason, the self-diagnosis device always consumes power. However, the use of power windows and power seats is not so frequent, which means that constantly powering the self-diagnostic device wastes a great deal of power, especially if the power supply is powered by a battery. Is a big problem.

The self-diagnosis device for a motor for a vehicle-mounted device shown in FIG. 6 can detect an abnormality during the operation of a power window or a power seat as shown in FIG. , ΔI / Δt> K ′ as described above.
If it is determined that an abnormality has occurred at this time, the motor current I sharply rises as an inrush current even when the motor 1 is started in FIG. Then, since the rate of change ΔI / Δt of the motor current I at this time also satisfies the above equation, the motor 1 is stopped as an abnormal state. Thus, for example, in the case of a power window, the window does not open or close.

Therefore, in the conventional self-diagnosis device, the abnormality of the motor 1 is prevented from being detected during the inrush current generation period T (for example, 100 msec) from the start of the motor 1 until the motor current I becomes a steady current. ing. But,
In this way, for example, in the case of a power window, when the motor 1 is started and the window is closed from a state where an object is sandwiched by a partially closed window, the motor 1 is slightly rotated even if started. And cannot rotate. Therefore, as the motor current I,
The rise due to the abnormality overlaps with the rush current due to the start, and the abnormality cannot be detected because it is a period during which the rush current occurs.

Further, in the conventional selective drive mechanism shown in FIG. 8, two changeover switches are required for each motor. As the number of motors increases, the required number of changeover switches also increases in proportion to the number of motors. Will increase. Moreover,
Such a changeover switch is an expensive relay switch controlled by a microcomputer, and as the number of used switches increases, there is a problem that the price of a vehicle-mounted device such as a power window or a power seat rapidly increases.

A first object of the present invention is to provide a self-diagnosis device for a motor for a vehicle-mounted device, in which power is supplied only when the motor is operated, and the power consumption can be greatly reduced. .

A second object of the present invention is to provide a self-diagnosis device for a vehicle-mounted device capable of detecting a motor abnormality at the time of starting.

A third object of the present invention is to provide a drive device for a motor for a vehicle-mounted device, in which the number of switch means used can be reduced so that forward and reverse rotation of a plurality of motors can be selected.

[0021]

In order to achieve the first object, the present invention provides means for supplying a power supply voltage to the amplifier from the motor side rather than a switch for turning on / off the power supply to the motor.

In order to achieve the second object,
The present invention provides, for a predetermined sufficiently small positive value K,
When the rate of change ΔI / Δt of the motor current is ΔI / Δt <−K, it is determined that the motor is in an abnormal state.

To achieve the third object, the present invention provides a first switch means for selectively connecting one terminal of each motor to one of a battery side and a ground side, Second switch means for selecting any one of the other terminals of the motor, and third switch means for selectively connecting the second switch means to either the battery side or the ground side; Is provided.

[0024]

The power is supplied to the amplifier only when the switch is turned on and the motor is operating, so that wasteful power consumption in the amplifier is avoided.

When the motor is abnormal due to an object being caught in a window or the like from the start of the motor, an inrush current is generated in the motor current when the motor is started, but the motor can hardly rotate, and the inrush current is reduced. Even if the current value decreases, the current value does not drop sharply to a small steady-state current value, and the current value is kept large. Therefore,
If there is no sudden drop from the inrush current to the steady current,
The motor is in an abnormal state at the time of start-up, and when the rate of change ΔI / Δt of the motor current is smaller than a sufficiently small negative value −K, the motor current does not suddenly drop from the inrush current to the steady-state current. Sometimes it can be determined that it is in an abnormal state.

Furthermore, since the first and third switch means select whether to connect each motor to a battery or to ground in accordance with the rotation direction of the motor, even if the number of motors increases, the first and third switch means can be used. The number of switch means does not increase. The only increase is the size of the second switch means for selecting each motor, and this scale only increases in proportion to the number of switch means. Therefore, the rate of increase in the number of switch means is smaller than in the conventional example shown in FIG.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a self-diagnosis device for a motor for an in-vehicle device according to the present invention. In FIG. 1, portions corresponding to those in FIG.

In the figure, an anode of a diode 6 is connected between the movable contact side of the changeover switch 2 and one terminal of the motor 1, and is connected between the movable contact side of the changeover switch 3 and the other terminal of the motor 1. Is connected to the anode of the diode 7. The cathodes of these diodes 6 and 7 are both connected to the power supply terminal of the operational amplifier constituting the differential amplifier 5. These changeover switches 2 and 3 are, for example, relay switches, and are controlled by a microcomputer (not shown) based on the operation of the rider.

In such a configuration, when the changeover switches 2 and 3 are closed to the B side and the battery voltage + B is not applied to the motor 1 and the motor is stopped, any one of the anodes of the diodes 6 and 7 can be used. Since no positive battery voltage is applied to the operational amplifier, no power supply voltage is applied to the operational amplifier. Therefore, when the motor 1 is stopped, power is not consumed by the differential amplifier.

When the changeover switch 2 is closed to the A side and the switch 3 is closed to the B side and the motor 1 rotates forward,
The battery voltage + B is supplied as a power supply voltage to the operational amplifier via the changeover switch 2 and the diode 6, and the differential amplifier 5 operates to perform self-diagnosis of the motor 1. Further, when the changeover switch 2 is closed to the B side and the switch 3 is closed to the A side and the motor 1 rotates in the reverse direction, the battery voltage +
B is supplied as a power supply voltage to the operational amplifier via the changeover switch 3 and the diode 7, and the differential amplifier 5 operates to perform self-diagnosis of the motor 1.

As described above, this embodiment uses the motor 1
Only when the battery voltage + B is applied and the self-diagnosis is required, the power supply voltage is supplied to the amplifier 5 so that the self-diagnosis is performed.
When B is not applied, unnecessary power consumed by the self-diagnosis device can be eliminated. Therefore, the power consumption of the self-diagnosis device can be significantly reduced.

FIG. 2 is an expanded view of the embodiment shown in FIG. 1 when there are two motors. This apparatus includes a motor 1 ', changeover switches 2' and 3 ', and a motor current detector. A resistor 4 ', a differential amplifier 5', and diodes 6 'and 7' are provided, and portions corresponding to those in FIG.

In the same figure, this example shows a case where a motor 1 'is added to a motor 1 provided with a self-diagnosis device including a resistor 4, a differential amplifier 5 and the like as in FIG. This motor 1 'is also provided with a self-diagnosis device including a resistor 4' and a differential amplifier 5 '.

Here, similarly to the motor 1, the anode of the diode 6 'is connected between the movable contact side of the changeover switch 2' and one terminal of the motor 1 ', and the changeover switch 3'
The anode of a diode 7 'is connected between the movable contact of the motor 1' and the other terminal of the motor 1 '. The cathodes of these diodes 6 'and 7' are both connected to the power supply terminal of the operational amplifier constituting the differential amplifier 5 '.

Therefore, it is now assumed that one or both of the changeover switches 2 and 3 and the changeover switches 2 'and 3' are controlled by a microcomputer (not shown), and one or both of the motors 1 and 1 'are rotated. Then, the battery voltage + B is applied as the power supply voltage to the differential amplifiers 5, 5 ', and both the self-diagnosis devices 5, 5' operate. In this case, assuming that only one motor, for example, the motor 1 is rotated, the microcomputer knows this. Therefore, the microcomputer does not take in the output of the non-rotating differential amplifier, in this case, the differential amplifier 5 '.

Thus, the same applies to the case where three or more motors are used. Even when a plurality of motors are used, the power supply voltage is applied to the self-diagnosis device only when the power supply voltage is applied to the motors. It can be applied.

The power supply voltage may be applied only to the differential amplifier of the self-diagnosis device for the motor to which the battery voltage + B is applied.

FIG. 3 is a diagram showing another embodiment of a self-diagnosis device for a motor for a vehicle-mounted device according to the present invention.

As described with reference to FIG. 7, in the conventional self-diagnosis device for a motor for a vehicle-mounted device, the operation is started after the inrush current of the motor current has passed. The operation starts at the same time.

Referring to FIG. 1, a power window will be described as an example. If an object is caught in the window when the motor 1 is stopped, when the motor 1 is started, the motor current changes as shown in FIG. I do. That is, at the start of the start, the motor current I sharply increases to become an inrush current, and the motor 1 tries to rotate, but cannot rotate to rotate slightly, and the motor current I passes through the peak of the inrush current. Then, the current value slightly decreases, but the large current value is maintained as it is.

The microcomputer continuously captures the data obtained by A / D-converting the output of the differential amplifier 5 from the start of the motor 1 and obtains a digital value difference ΔI between the two data to be subsequently captured. The rate of change ΔI / Δt of the motor current divided by the period Δt of the sampling pulse in the converter is obtained, and is compared with a sufficiently small negative value −K to determine whether or not the motor 1 is abnormal. I do.

Therefore, as described above, the motor 1
If there is an abnormality, the motor current passes through the peak of the inrush current, and ΔI / Δt <−K. The microcomputer detects that the motor is abnormal, and switches the changeover switches 2 and 3 to the B side in FIG. To stop the motor 1, or switch the switches 2 and 3 to reverse the motor 1 so that the window opens.

In this way, for example, when the motor 1 is started and the body is caught in the window, the window is immediately stopped or the window is opened to prevent the self-raising. Can be.

When the motor 1 cannot pass through the window after the motor current I has passed the breakthrough current, the microcomputer detects the motor 1 in the same manner as in the conventional self-diagnosis apparatus described with reference to FIG. Motor current change rate ΔI / Δ
t is ΔI / Δ for a large positive value K ′ set in advance.
By detecting that t> K ′, it is determined that an abnormality has occurred in the motor 1, and the motor 1 is stopped or the motor 1 is rotated in the reverse direction as described above.

FIG. 4 is a flowchart showing the above operation. In the figure, steps 402, 403, 404
Are repeated during the inrush current period of the motor current (here, this period is set to 100 msec). If no abnormality is detected in the motor 1 during this period, the windows of steps 405, 406, and 407 are closed and opened. A series of operations is repeated until the motor 1 cannot rotate, or until the motor 1 cannot rotate due to the object being caught in the window. When the window closes or when the window is caught halfway, it is detected in step 407, the safety operation is performed as described above, and the motor 1 stops (step 409). The above is the same operation as described with reference to FIG.

During the period of the inrush current, the motor 1
Is detected in step 403, the safety operation is performed (step 408), and the motor 1 stops.

It should be noted that the motor 1 is not closed during the opening and closing operation of the window.
Is performed by the microcomputer (step 405), and the motor 1 is stopped (step 409).

The power window has been described above as an example, but the same applies to other in-vehicle devices such as a power seat.

FIG. 5 is a block diagram showing an embodiment of a selective drive mechanism for a motor for a vehicle-mounted device according to the present invention.
b is a motor, and 8 to 10 are changeover switches.

In the figure, one terminal of the two motors 1a and 1b is connected to a movable contact C of a changeover switch 8. The fixed contact A of the changeover switch 8 is connected to a battery (not shown), and the fixed contact B is grounded. Each is connected to a terminal. The other terminals of the motors 1a and 1b are connected to a fixed terminal D and a fixed terminal E of the changeover switch 9, respectively.
The movable contact of the changeover switch is connected to the movable contact of the changeover switch 10. And this changeover switch 10
The fixed contact A is connected to a battery (not shown), and the fixed contact B is connected to a ground terminal.

Here, the changeover switch 9 is for selecting one of the motors 1a and 1b to be driven to rotate, and the changeover switches 8 and 10 are for determining the rotation direction of the selected motor. It is. These changeover switches 8, 9, and 10 are controlled by a microcomputer (not shown) based on the operation of the passenger.

Therefore, when the changeover switches 8 and 10 are both closed to the B side, even if either of the motors is selected by the changeover switch 9, both terminals of the motor are grounded. Does not rotate.

With the changeover switch 9 selecting the motor 1, the changeover switch 8 is closed to the A side, and the changeover switch 1
When 0 is closed to the B side, motor current flows from the battery of + B voltage to the ground terminal through the changeover switch 8, the motor 1, and the changeover switches 9 and 10, and the motor 1 rotates. Assuming that the rotation of the motor 1 at this time is forward rotation, the changeover switch 8 is closed to the B side, and when the changeover switch 10 is closed to the A side, the changeover switch 10, 10
9. Motor current flows to the ground terminal through the motor 1 and the changeover switch 8, and the motor 1 rotates in the reverse direction. The above operation is
The same applies to the motor 1b selected by the changeover switch 9.

In this way, any one of the motors can be selected, and the motor can be stopped or rotated forward and backward.

Here, in comparison with the conventional mechanism shown in FIG. 8 using two motors, this conventional mechanism requires four changeover switches 2a, 2b, 3a and 3b, In this embodiment, only three are required and one is reduced. Generally, when n motors (where n is an integer of 2 or more) are used, and when each motor is driven as shown in FIG. 8, 2n changeover switches are required. In the embodiment, only one changeover switch 8 and one changeover switch 10 are required regardless of the number of motors, and only the changeover switch 9 is a complex switch having n movable contacts. By the way, a relay switch that opens and closes can be used as such a changeover switch 9,
When such a relay switch is used for n motors, n relay switches are required, but the total number of switches to be used is 2n when the motor is connected as shown in FIG. On the other hand, in this embodiment, (n +
1) Differently, the number of switches to be used can obviously be reduced.

In this embodiment, a self-diagnosis device can be provided for each motor as shown in FIG.

[0057]

As described above, according to the present invention,
Since the power supply voltage is supplied to the amplifier of the self-diagnosis device only when the battery voltage is supplied to the motor, unnecessary power consumption of the amplifier can be eliminated, and the power consumption of the self-diagnosis device can be greatly reduced. Can be.

Further, according to the present invention, an abnormality of the motor can be detected from the start of the motor start, and an accident due to an object being caught in the window can be prevented.

Further, according to the present invention, the number of switch means used for a plurality of motors can be reduced, and the structure of the mechanism can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a self-diagnosis device for a motor for a vehicle-mounted device according to the present invention.

FIG. 2 is a circuit diagram showing a configuration when two motors of the embodiment shown in FIG. 1 are used.

FIG. 3 is a diagram showing a change in motor current in FIG. 1 when there is an abnormality in the motor at startup.

FIG. 4 is a flowchart showing an operation of detecting a motor abnormality at the time of starting the motor with respect to the motor current shown in FIG. 4;

FIG. 5 is a circuit diagram showing an embodiment of a selective drive mechanism for a motor for a vehicle-mounted device according to the present invention.

FIG. 6 is a circuit diagram showing an example of a conventional self-diagnosis device for a motor for a vehicle-mounted device.

FIG. 7 is a diagram showing an example of a change in motor current to be detected by a conventional self-diagnosis device for a vehicle-mounted device motor.

FIG. 8 is a circuit diagram showing an example of a conventional selective drive mechanism for a vehicle-mounted device motor.

[Explanation of symbols]

 1,1 ', 1a, 1b Motor 1,2', 3,3 'switch 4,4' Motor current detecting resistor 5,5 'Differential amplifier 6,7,6', 7 'Diode 8-10 switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-172924 (JP, A) JP-A 4-76551 (JP, U) JP-A 60-177639 (JP, U) JP-A 62- 160083 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 16/02 650 B60R 16/02 645

Claims (3)

(57) [Claims] 1. A self-diagnosis device for a motor for a vehicle-mounted device, wherein a current of a motor supplied from a battery via a switch is detected, amplified by an amplifier, and an abnormal state of the motor is detected from an output of the amplifier. Wherein a means for supplying power to the amplifier with a voltage on the output side of the switch as a power supply voltage is provided, and the power supply voltage is supplied to the amplifier only when the motor is operated. Self-diagnosis device. 2. A self-diagnosis device for a motor for a vehicle-mounted device, wherein a current of a motor supplied from a battery via a switch is detected, amplified by an amplifier, and an abnormal state of the motor is detected from an output of the amplifier. The change rate of the motor current ΔI / Δt during the period of the inrush motor current at the time of starting the motor by the output of the amplifier.
A self-diagnosis device for a motor for a vehicle-mounted device, characterized in that a means for stopping power supply to the motor is provided when ΔI / Δt <−K, where K is a sufficiently small positive value. 3. A selective drive mechanism for a motor for an in-vehicle device, wherein a power supply voltage is supplied from a battery to a motor provided in each of a plurality of devices mounted on a vehicle so that the device can be operated as desired. First switch means for selectively connecting one terminal of each of the motors to one of the battery side and ground side, and second switch means for selecting one of the other terminals of each of the motors And third switch means for selectively connecting the second switch means to either the battery side or the ground side, and a switching operation of the first, second, and third switch means. A drive mechanism for a vehicle-mounted device motor, wherein one of the motors can be driven to rotate in a forward or reverse direction.