JPH07215145A - Self-diagnosable device of motor for on-vehicle device and selection driving mechanism of motor thereof - Google Patents

Abstract

PURPOSE:To reduce electric power consumption in an amplifier of a self- diagnosable device. CONSTITUTION:When changeover switches 2 and 3 are closed to the B side, since battery voltage +B is not supplied, a motor 1 is stopped. When the changeover switch 2 is closed to the A side and the changeover switch 3 is closed to the B side, respectively, or when the changeover switch 2 is closed to the B side and the changeover switch 3 is closed to the A side, respectively, the battery voltage +B is supplied to the motor 1 through the changeover switch 2 or the changeover switch 3, and the motor 1 rotates forward or backward, but at the same time, the battery voltage +B is supplied to a differential amplifier 5 through a diode 6 or a diode 7. Thereby, a self-diagnosable device is put in an actuating condition. Thereby, since electric power supply voltage is supplied to the differential amplifier 5 only when the electric power supply voltage is supplied to the motor 1, wasteful electric power consumption in the differential amplifier 5 is eliminated.

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, etc. And a selective drive mechanism for these motors.

[0002]

2. Description of the Related Art Recently, in passenger cars and the like, a power seat capable of opening and closing a window by a switch operation of a passenger and a power seat capable of adjusting a position of a seat and an angle of a backrest. Such devices (that is, vehicle-mounted devices) have come to be installed. In such power windows and power seats, a motor using a voltage from a battery mounted on a passenger car as a power supply voltage is used, and the window is opened or closed or the seat is moved by driving the motor.

By the way, in such an on-vehicle device, it is necessary to detect that the motor is in an abnormal state due to locking, opening or short-circuiting, and stop 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 an on-vehicle device. This device includes a motor 1, a changeover switch 2 and 3, a motor current detecting resistor 4. , A differential amplifier 5 is provided.

In the figure, when both the changeover switches 2 and 3 are 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 not supplied with power and is in a stopped state. It is in. 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 the 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. To be done. In this state, the battery voltage + B is applied to the motor 1 through 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 in the forward direction. When the changeover switch 2 is closed to the B side and the changeover switch 3 is closed to the A side, one terminal of the motor 1 is grounded through the changeover switch 2 and the resistor 4, and the other terminal of the motor 1 is changed over. Connected to the battery via. 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 in the reverse direction.

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

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

[0008] In such a self-diagnosis device, for example, even when something is caught in the window while the window is closing, this can be detected.

That is, the motor current I from the start of the motor 1
As shown in FIG. 7, when the motor current I suddenly rises at the same time as the start-up, and then suddenly falls, an inrush current occurs, and when the motor 1 enters the steady state and the inrush current ends, the change is low. When the value reaches a steady value and the window closes and does not move, the motor current I rapidly increases.

Therefore, in the self-diagnosis device shown in FIG.
The microcomputer sequentially takes in digital value data obtained by A / D converting the output of the differential amplifier 5, and changes the motor current from the difference ΔI between two consecutively taken data ΔI / Δt. 6 is obtained, it is determined that the motor 1 is in the locked state when ΔI / Δt> K ′ with respect to a preset positive value K ′.
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 rapidly increases as shown by the solid line in FIG. 7, and this can be detected, and the motor 1 should be stopped. You can Also,
Even if the motor 1 cannot rotate due to a situation such as when the window is closed, the motor current rapidly increases as shown by the broken line in FIG. 7, so that this can be detected and the motor 1 can be stopped. .

Further, each of the motors of the vehicle-mounted devices such as the power window and the power seat is provided with two change-over switches, which enable the forward / reverse rotation changeover as described with reference to FIG. ing. Figure 8
An example of a conventional motor selection drive mechanism in the case of using two motors is shown in FIG. This motor selection drive mechanism is a motor 1a,
1b and changeover switches 2a, 2b, 3a, 3b are provided. Here, a self-diagnosis device for each of the motors 1a and 1b is not shown.

In FIG. 6, the connection relationship between the changeover switches 2a, 2b, 3a and 3b of the respective motors 1a and 1b and the power source and the ground terminal is the same as that shown in FIG.
The self-diagnosis device in 1. is omitted. In such a configuration, by switching the changeover switches 2a and 3a, the motor 1a can be rotated in the forward and reverse directions or can be stopped. Similarly, by switching the changeover switch, the motor 1b can be rotated in the forward and reverse directions or can be stopped.

[0014]

By the way, in the conventional motor self-diagnosis apparatus for an on-vehicle apparatus shown in FIG. 6, the operational amplifier constituting the differential amplifier 5 is provided with a battery regardless of whether the motor 1 is in operation or not. Is always powered by. Therefore, the self-diagnosis device always consumes electric power. However, the use of power windows and power seats is not so frequent, and thus constantly supplying power to the self-diagnostic device wastes a great deal of power, especially when the power supply is a battery. If so, it becomes a big problem.

Further, as shown in FIG. 7, the on-vehicle device motor self-diagnosis device shown in FIG. 6 can detect an abnormality during the operation of the power window or the power seat. , As described above, ΔI / Δt> K '
If it is determined to be abnormal at this time, in FIG. 7, the motor current I sharply increases as an inrush current even when the motor 1 is started. Then, the change rate ΔI / Δt of the motor current I at this time also satisfies the above expression, so that the motor 1 is stopped as an abnormal state. Therefore, in the case of a power window, for example, the window will not be opened or closed.

Therefore, in the conventional self-diagnosis device, the abnormality detection of the motor 1 is prevented 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,
By doing this, for example, in a power window, if the motor 1 is started and the window is closed from a state in which something is caught in a partially closed window, the motor 1 will rotate slightly even if it is started. It becomes impossible to rotate. Therefore, as the motor current I,
The rise due to this abnormality overlaps with the inrush current due to startup, and this abnormality cannot be detected because it is the period during which the inrush current occurs.

Further, in the conventional selective drive mechanism shown in FIG. 8, two changeover switches are required for each motor, and when the number of motors increases, the required number of changeover switches also increases in proportion to the number of motors. Increase. Moreover,
Such a changeover switch is an expensive relay switch controlled by a microcomputer, and as the number of switches used increases, the cost of in-vehicle devices such as power windows and power seats increases rapidly.

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

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

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

[0021]

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

In order to achieve the second object,
In the present invention, for a preset positively small 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.

In order to achieve the above-mentioned third object, the present invention comprises first switch means for selectively connecting one terminal of each motor to either the battery side or the ground side, and the respective first switch means. Second switch means for selecting 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. To provide.

[0024]

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

Further, when something is caught in a window or the like from the start of the motor and the motor is abnormal, a rush current is generated in the motor current with the start of the motor, but the motor can hardly rotate and the rush current causes Even if the current value drops, it does not suddenly drop to a small steady-state current value, and the current value is kept large. Therefore,
If there is no sudden drop from inrush current to steady current,
The motor is in an abnormal state at startup, and when the rate of change in motor current ΔI / Δt is smaller than a sufficiently small negative value -K, the motor current does not suddenly drop from the inrush current to the steady current, so the motor starts. Sometimes it can be determined that there is an abnormal condition.

Further, since the first and third switch means select whether to connect each motor to the battery or to ground it, depending on the rotation direction, even if the number of motors increases The number of switch means does not increase. It is only the scale of the second switch means for selecting each motor that increases, and this scale only increases in proportion to the number of switch means. Therefore, as compared with 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 an on-vehicle device according to the present invention, in which parts corresponding to those in FIG.

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

In such a configuration, when the changeover switches 2 and 3 are closed to the B side, the battery voltage + B is not applied to the motor 1 and the motor is stopped, the anodes of the diodes 6 and 7 are not operated. 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, the differential amplifier does not consume power.

Further, 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 is rotated 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 self-diagnose 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 is rotated 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.

In this way, this embodiment is based on 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 to perform the self-diagnosis, and the battery voltage + B is supplied to the motor 1.
It is possible to eliminate unnecessary power consumption in the self-diagnosis device when B is not applied. 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 in the case of two motors, and this device has a motor 1 ', changeover switches 2', 3 ', and a motor current detection. The resistor 4 ', the differential amplifier 5', and the diodes 6'and 7'are provided, and the portions corresponding to those in FIG.

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

Here, like the motor 1, the anode of the diode 6'is connected between the movable contact side of the selector switch 2'and one terminal of the motor 1 ', and the selector switch 3'is connected.
The anode of the diode 7'is connected between the movable contact side of the 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 forming the differential amplifier 5 '.

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

In this way, the same applies when three or more motors are used, and 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. 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 the self-diagnosis device for an on-vehicle device motor according to the present invention.

As described with reference to FIG. 7, in the conventional self-diagnosis device for a motor for an on-vehicle device, the operation is started after the inrush current of the motor current has passed. In this embodiment, however, the motor start is started. With that, the operation starts.

Referring to FIG. 1, taking a power window as an example, the motor current changes as shown in FIG. 3 when the motor 1 is started when something is stuck in the window when the motor 1 is stopped. To do. That is, with the start of the start-up, the motor current I rapidly rises to an inrush current, and the motor 1 tries to rotate, but slightly rotates and cannot rotate, and the motor current I passes through the peak of the inrush current. Then, it slightly decreases, but the large current value is maintained as it is.

The microcomputer continues to take in the data obtained by A / D converting the output of the differential amplifier 5 from the start of starting the motor 1, and continuously obtains the difference ΔI in the digital value between the two taken in data, and A / D converts this. It is determined whether or not there is an abnormality in the motor 1 by obtaining the rate of change ΔI / Δt of the motor current divided by the period Δt of the sampling pulse in the measuring device and comparing it with a preset sufficiently small negative value −K. To do.

Therefore, as described above, the motor 1
Is abnormal, the motor current passes through the peak of the inrush current and becomes ΔI / Δt <-K, and the microcomputer detects that the motor is abnormal, and in FIG. 1, switches the changeover switches 2 and 3 to the B side. To stop the motor 1 or switch the changeover switches 2 and 3 respectively to reverse the motor 1 and open the window.

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 so that the self does not wake up. You can

If the motor 1 cannot rotate because the motor current I has exceeded the breakthrough current and the motor 1 cannot rotate, the microcomputer detects it as in the conventional self-diagnosis device described in FIG. Motor current change rate ΔI / Δ
When t is a large positive value K'set in advance, ΔI / Δ
When t> K 'is detected, 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 flow chart showing the above operation. In the figure, steps 402, 403, 404
Is a motion of the inrush current period of the motor current (here, this period is 100 msec), and if no abnormality is detected in the motor 1 during that period, the windows of steps 405, 406, and 407 are completed. A series of operations is repeated until the motor 1 is stopped or the motor 1 cannot be rotated due to something caught in the window. When the window is closed, or when the window is completely crushed, it is detected in step 407, the safety operation is performed as described above, and the motor 1 is stopped (step 409). The above is the same operation as described in FIG.

During the period of inrush current, the motor 1
If an abnormality occurs in step S403, this is detected in step 403, a safety operation is performed (step 408), and the motor 1 is stopped.

During the opening / closing operation of the window, the motor 1
When the stop operation is performed by the microcomputer, this is determined (step 405) and the motor 1 is stopped (step 409).

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

FIG. 5 is a block diagram showing an embodiment of a selective drive mechanism for an on-vehicle device motor according to the present invention.
Reference numeral 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 the movable contact C of the 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. It is connected to each terminal. The other terminals of these motors 1a and 1b are connected to the fixed terminals D and 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 the motor of the motors 1a and 1b to be rotationally driven, and the changeover switches 8 and 10 are for determining the rotation direction of the selected motor. 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, no matter which motor is selected by the changeover switch 9, both terminals of the motor are grounded, so that the motor is 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, a motor current flows from the battery of + B voltage through the changeover switch 8, the motor 1, and the changeover switches 9 and 10 to the ground terminal, and the motor 1 rotates. When the rotation of the motor 1 at this time is forward rotation, when the changeover switch 8 is closed to the B side and the changeover switch 10 is closed to the A side, the changeover switch 10, from the battery of the voltage of + B,
9, the motor current flows through the motor 1 and the changeover switch 8 to the ground terminal, 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, one of the motors can be selected, and the motor can be stopped or rotated in the forward and reverse directions.

Here, in comparison with the conventional mechanism shown in FIG. 8 which also uses two motors, this conventional mechanism requires four changeover switches 2a, 2b, 3a, 3b. In this embodiment, the number is three and the number is one less. Generally, when n (where n is an integer of 2 or more) motors are used, 2n changeover switches are required when driving each motor as shown in FIG. In the embodiment, only one of the changeover switch 8 and the changeover switch 10 is required regardless of the number of motors, and only the changeover switch 9 is a complicated 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 motors are connected as shown in FIG. On the other hand, in this embodiment, (n +
1) Differently, it is possible to obviously reduce the number of switches used.

In this embodiment as well, 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, it is possible to eliminate wasteful power consumption of the amplifier and significantly reduce the power consumption of the self-diagnosis device. You can

Further, according to the present invention, it is possible to detect an abnormality of the motor from the start of starting the motor, and it is possible to prevent an accident due to something caught in the window.

Further, according to the present invention, it is possible to reduce the number of switch means to be used for a plurality of motors, simplify the structure of the mechanism, and realize low cost.

[Brief description of drawings]

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

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

FIG. 3 is a diagram showing a change in motor current in FIG. 1 when a start-up motor has an abnormality.

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

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

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

FIG. 7 is a diagram showing an example of changes in a motor current that is a detection target of a conventional self-diagnosis device for a motor for a vehicle-mounted device.

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

[Explanation of symbols]

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

Claims (3)

[Claims] 1. A self-diagnosis device for a motor for an in-vehicle device, which detects a current of a motor supplied from a battery through a switch, amplifies the current with an amplifier, and detects an abnormal state of the motor from an output of the amplifier. In the motor of the vehicle-mounted device, the means for supplying the amplifier with the output voltage of the switch as the 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 an in-vehicle device, which detects a current of a motor supplied from a battery through a switch, amplifies the current with an amplifier, and detects an abnormal state of the motor from an output of the amplifier. At the output of the amplifier, the rate of change of the motor current ΔI / Δt during the generation period of the inrush motor current at the start of the motor is
Is detected and K is set to a sufficiently small positive value, and when ΔI / Δt <−K, a means for stopping power supply to the motor is provided. 3. A selective drive mechanism for a motor for an on-vehicle device, which is capable of operating a desired device by supplying a power supply voltage from a battery to a motor provided in each of a plurality of on-vehicle devices, comprising: First switch means for selectively connecting one terminal of each motor to either the battery side or the ground side, and second switch means for selecting any one of the other terminal of each motor And a third switch means for selectively connecting the second switch means to one of the battery side and the ground side, and by a switching operation of the first, second, and third switch means. A selective drive mechanism for a motor for an in-vehicle device, wherein any one of the motors can be rotationally driven in a forward direction or a reverse direction.