JP2001245489A - Controller of on-vehicle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a motor by maintaining the operation of a control circuit even when the contact inferiority of an ignition switch occurs after the start of the control circuit. SOLUTION: An APC circuit 10 is constituted of a start part 101 for starting the control circuit 1 by turning on the ignition switch (IG), and a holding part 102 for holding a power supply path from a battery to the control circuit 1 and the power source terminal of a predriver in a closed state by performing operation by the output of the control circuit 1 after start. The holding part 102 is provided between the positive terminal +B of the battery and a regulator 11, constituted of a switching element such as a transistor held an on state by a control signal output from the control circuit 1. The start part 101 is interlocked with the on state of the ignition switch (IG) to be turned on, and constituted of a switching element or the like such as a transistor turning on the switching element of the holding part 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a vehicle-mounted motor powered by a battery and a control circuit for controlling the operation of the motor, and supplies power to a power supply terminal of the control circuit via a regulator by turning on an ignition switch. The present invention relates to a control device for a vehicle-mounted motor.

[0002]

2. Description of the Related Art Conventionally, a motor for a power steering which is a vehicle-mounted motor is composed of a three-phase DC brushless motor, and is controlled by a control device having a configuration as shown in FIG. That is, as shown in FIG. 4, a driving signal is output from the pre-driver PD based on a driving control signal output from a control circuit CO including a microcomputer. Of the switching elements of the three-phase bridge inverter IV composed of three switching elements on the side, a predetermined combination of the upper and lower switching elements is switched, and the three-phase DC brushless motor is driven from the battery E mounted on the vehicle body. The motor M is driven by controlling the energization path to each winding of M by a plurality of switching elements.

At this time, as shown in FIG. 4, power is supplied to the control circuit CO and the pre-driver PD via a regulator RG connected to a battery E by turning on an ignition switch IS. The terminal voltage of the battery E is stepped down and stabilized by the regulator RG, and the control voltage Vcc is supplied to the power supply terminals of the control circuit CO and the pre-driver PD.

[0004]

Incidentally, since the ignition switch IS is frequently rotated, it is possible that poor contact may occur. And
In FIG. 4, since the control voltage Vcc is supplied to the control circuit CO via the regulator RG connected to the battery E when the ignition switch IS is turned on, the control circuit CO is temporarily turned on when the ignition switch IS is turned on. Even if it starts, the ignition switch IS
When the contact failure occurs, the power supply path between the regulator RG and the battery E is opened, the supply of the control voltage Vcc from the regulator RG to the control circuit CO and the pre-driver PD is stopped, and the operation of the control circuit CO is stopped. And motor M
The inconvenience that the control cannot be continued occurs.

In order to solve such inconvenience, it is conceivable to connect the regulator RG to the battery E and supply power directly from the battery E to the regulator RG. In this case, the regulator RG is turned off even when the ignition switch IS is turned off. And the control voltage Vcc by the regulator RG is continuously supplied to the control circuit CO and the pre-driver PD, which causes a problem that the battery E is unnecessarily consumed.

When power is directly supplied from the battery E to the regulator RG in this manner, switch means for turning on the ignition switch IS is provided between the battery E and the regulator RG, whereby the ignition switch IS When the power supply is turned off, the power supply from the battery E to the regulator RG may be cut off to prevent unnecessary consumption of the battery E. However, since such a switch is very expensive, there is another problem that the cost of the entire apparatus is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to control the motor while maintaining the operation of the control circuit even if the ignition switch has a poor contact after the start of the control circuit.

[0008]

In order to achieve the above-mentioned object, the present invention provides an activation section for activating the control circuit by turning on the ignition switch, and an activation section which operates by an output of the control circuit after activation. And a holding unit for holding a power supply path from the battery to a power supply terminal of the control circuit in a closed state.

According to such a configuration, once the control circuit is activated by the activation unit, the holding unit operates to hold the power supply path from the battery to the power supply terminal of the control circuit in a closed state.

Therefore, even if a contact failure of the ignition switch occurs after the control circuit is activated by the activation unit, power supply to the power supply terminal of the control circuit is continued, and the operation of the control circuit is maintained. Is performed continuously.

At this time, the present invention can be applied to a motor for a vehicle such as a motor for a power window, a motor for a door mirror, a motor for a power steering, and the control of the motor at least in conjunction with the turning on of an ignition switch. Any in-vehicle motor may be used as long as the circuit starts.

Further, according to the present invention, the starting unit includes a switching element for operating the holding unit in conjunction with turning on of the ignition switch, and power is supplied from the battery to the regulator by the operation of the holding unit by the switching element. The method is characterized in that a road is closed and the control circuit is activated by supplying power to the control circuit.

According to such a configuration, the holding element is operated by the switching element, which is a starting part, in conjunction with the turning on of the ignition switch, and the power supply path from the battery to the regulator is closed by the operation of the holding element. For,
The control circuit can be started reliably.

Further, according to the present invention, the starting unit includes a power supply path that connects the battery and the regulator, and is closed by turning on the ignition switch. The power supply terminal of the control circuit is supplied with power through the control circuit to start the control circuit.

According to such a configuration, when the ignition switch is turned on, the above-described power supply path connecting the battery and the regulator is closed, and when the power supply path is closed, the power supply terminal of the control circuit is connected via the regulator. , The control circuit can be reliably started.

Further, according to the present invention, the vehicle-mounted motor comprises a DC brushless motor for power steering,
It is characterized by being PWM-controlled by the control circuit. According to such a configuration, even if a contact failure of the ignition switch occurs after the activation of the control circuit by the activation unit, the control of the DC brushless motor for power steering is continuously performed by the PWM control of the control circuit. It is also possible to continue to generate stable assist torque in power steering.

[0017]

(First Embodiment) A first embodiment in which the present invention is provided to a power steering motor will be described with reference to FIGS. 1 and 2. FIG. However, FIG.
Is a connection diagram showing the entire configuration, and FIG. 2 is a partial connection diagram.

A control device for a power steering motor, which is a motor mounted on a vehicle such as an automobile, is configured as shown in FIG. A detector (not shown) composed of a rotary encoder or the like is provided on a steering (not shown). In response to the operation of the steering, a two-phase pulse signal having a phase shift of 90 °, for example, is converted from the detector as a detection signal to a subsequent signal conversion. The signal is output to a signal conversion unit (not shown), and the signal conversion unit shapes the waveform of the detection signal.

When a waveform-shaped detection signal is input to a control circuit 1 comprising a microcomputer (hereinafter simply referred to as a microcomputer), the control circuit 1 detects a steering angular velocity for operating a steering wheel based on the detection signal. Then, the control circuit 1 determines the assist amount of the steering operation torque according to the high / low of the steering angular velocity, and drives the three-phase DC brushless motor 2 to generate the determined assist torque.

The three-phase DC brushless motor 2 is driven by a three-phase bridge inverter 3. The three-phase bridge inverter 3 is output from a pre-driver 4 based on a control signal from a control circuit 1. The upper three switching elements are turned on by a shift of 120 ° by a drive signal having a phase shift of 120 °, and similarly, by a drive signal of 120 ° output from the pre-driver 4 based on a control signal from the control circuit 1. By the driving signal with the phase shifted,
The lower three switching elements are turned on with a shift of 120 °.

Here, the control circuit 1 outputs a control signal so that the lower switching element of the arm different from the ON switching element of the upper switching elements is turned ON, and outputs the control signal to the upper switching element. Is switched in relation to the position of the rotor of the motor 2 detected by a rotation detector (not shown) composed of a Hall element. Note that a PWM control signal is output from the control circuit 1 to each switching element below the inverter 3, and the duty cycle in the PWM is controlled to control the current of the motor 2.

The control circuit 1 and the pre-driver 4
The control voltage Vcc is supplied to each power supply terminal via the APC circuit 10 and the regulator 11. At this time, the terminal voltage of the battery 13 is stepped down and stabilized by the regulator 11, and the control voltage Vcc is supplied to the power supply terminals of the control circuit 1 and the pre-driver 4.

The APC circuit 10 includes a starting unit 1 that starts the control circuit 1 when an ignition switch 12 is turned on.
01, and a holding unit 102 that is activated by the output of the control circuit 1 after startup and holds the power supply path from the battery 13 to the power supply terminals of the control circuit 1 and the pre-driver 4 in a closed state. Specifically, as shown in FIG. 2, the holding unit 102 is connected to the positive terminal + B of the battery 13 and the regulator 1.
1 and a switching element such as a transistor that is held in an on state by a holding control signal output from the control circuit 1, and the starting unit 101 operates in conjunction with turning on of an ignition switch (IG) 12. It comprises a switching element such as a transistor that turns on and turns on the switching element of the holding unit 102, a backflow prevention element and a low voltage element for stabilizing the operation of the switching element.

When the switching element of the holding unit 102 is turned on by turning on the switching element of the starting unit 101, the power supply path from the positive terminal + B of the battery 13 to the regulator 11 is closed by turning on the switching element of the holding unit 102. Then, the control voltage Vcc is supplied from the regulator 11 to the power supply terminal of the control circuit 1, the control circuit 1 is started, and the switching element of the holding unit 102 is turned on by the holding control signal output from the control circuit 1 after the start. The control circuit 1 self-holds the supply state of the control voltage Vcc to itself.

It should be noted that an ignition switch (IG) 12
Is turned off, the operation of the control circuit 1 is maintained by the holding function based on the holding control signal from the control circuit 1 as described above. In this case, the sensor for detecting the rotation of the engine of the vehicle and the vehicle speed are detected. The rotation of the engine and the stop of the vehicle are detected by the sensor, and when the control circuit 1 determines that the predetermined stop condition is satisfied, the output of the holding control signal from the control circuit 1 is stopped. For example, the power supply path from the battery 13 to the regulator 11 is reliably opened while the vehicle is stopped, so that unnecessary consumption of the battery 13 can be prevented.

As described above, once the control circuit 1 is started, the switching element of the holding unit 102 is held in the ON state by the holding control signal from the control circuit 1 after the start, and thereafter, the ignition switch (IG) 12
Even if a contact failure occurs, the power supply path from the positive terminal + B of the battery 13 to the regulator 11 does not open, and the control voltage V from the regulator 11 to the power supply terminal of the control circuit 1
The supply of cc is continued, the operation of the control circuit 1 is maintained, and the control of the motor 2 is continuously performed.

Therefore, according to the first embodiment, the starting unit 1 linked to turning on the ignition switch (IG) 12
When the switching element 01 is turned on, the switching element of the holding unit 102 is turned on, and the positive terminal of the battery 13
Since the power supply path from B to the regulator 11 is closed,
Power is supplied from the regulator 11 to the control circuit 1 so that the control circuit 1
Can be reliably started, and even if a poor contact of the ignition switch (IG) 12 occurs after the start of the control circuit 1, the supply of the control voltage Vcc to the power supply terminal of the control circuit 1 is continued. Can be maintained, and the control of the motor 2 can be continuously performed.

Further, since the switching element of the starting unit 101 is turned on in conjunction with the turning on of the ignition switch 12, a backflow preventing element or a constant current switch provided for stabilizing the operation of the switching element of the starting unit 101 is provided. The voltage element and the like need only be inexpensive and have a small withstand current, and the cost of the entire apparatus can be reduced.

(Second Embodiment) A second embodiment in which the present invention is applied to a power steering motor will be described with reference to the connection diagram of FIG. Note that the basic configuration of the control device for the power steering motor in the present embodiment is the same as that in FIG. 1, and therefore, the following description will also refer to FIG. .

In the present embodiment, the difference from the first embodiment is that, as shown in FIG.
And a holding unit 105 including a switching element such as a transistor, which is provided between the positive terminal + B and the regulator 11 and held in an on state by a holding control signal output from the control circuit 1, and an ignition switch (IG) 12
Is closed by turning on the battery 13 and the regulator 1
1 is connected to the holding unit 1.
A starting unit 108 composed of an OR circuit 107 that makes an OR connection with the power supply path from the power supply 05 to the regulator 11
That is, the PC circuit 10 is configured.

Then, an ignition switch (IG)
12 turns on the battery 11 and the regulator 11
When the power supply path 106 is closed, power is supplied from the battery 13 to the regulator 11, the control voltage Vcc is supplied to the power supply terminal of the control circuit 1 by the regulator 11, the control circuit 1 is activated, and the control circuit 1 The holding control signal is output to the switching element of the holding section 105, the switching element of the holding section 105 is held in the ON state, and the supply state of the control voltage Vcc to itself is held by the control circuit 1 by itself.

In this case, similarly to the above-described first embodiment, when the ignition switch (IG) 12 is turned off, the engine rotation and the vehicle speed are detected by a sensor for detecting the engine rotation of the vehicle and a sensor for detecting the vehicle speed. Is stopped, and when the control circuit 1 determines that the predetermined stop condition is satisfied, the output of the holding control signal from the control circuit 1 is stopped,
When the vehicle is stopped, the regulator 1
1 is opened, and unnecessary consumption of the battery 13 can be prevented.

As described above, once the control circuit 1 is started, the switching element of the holding unit 105 is held in the ON state by the holding control signal from the control circuit 1 after the start, and thereafter, the ignition switch (IG) 12
Contact failure occurs and the ignition switch (I
G) Even if the power supply path 106 on the 12 side is opened, the battery 13
The power supply from the positive terminal + B to the regulator 11 is not interrupted, the supply of the control voltage Vcc from the regulator 11 to the power supply terminal of the control circuit 1 is continued, the operation of the control circuit 1 is maintained, and the motor 2 Control is performed continuously.

Therefore, according to the second embodiment, it is possible to reliably start the control circuit 1 by supplying power from the regulator 11 to the control circuit 1, and a contact failure of the ignition switch 12 occurs after the start of the control circuit 1. Even the control circuit 1
, The operation of the control circuit 1 can be maintained by continuously supplying the control voltage Vcc to the power supply terminal, and the control of the motor 2 can be continuously performed.

Further, as compared with the above-described first embodiment,
Even if an abnormality occurs in the holding unit 105 and power cannot be supplied to the regulator 11 via the switching element of the holding unit 105, the ignition switch (I
G) Since power can be supplied to the regulator 11 via the power supply path 106 on the 12 side, it is possible to secure the supply of the control voltage Vcc to the control circuit 1 by doubling the power supply line.

Note that the OR in the second embodiment described above is
The circuit 107 may be formed by a wired OR.

Further, in each of the above-described embodiments, an example in which the vehicle-mounted motor is a power steering motor has been described. However, the present invention is not particularly limited to the power steering motor. The present invention can be applied to other in-vehicle motors, such as motors for door mirrors, motors for power windows, etc. In short, in-vehicle motors whose control circuits are activated at least in conjunction with turning on an ignition switch Should be fine.

The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the gist of the present invention.

[0039]

As described above, according to the first aspect of the present invention, once the control circuit is activated by the activation unit, the holding unit operates to supply the power from the battery to the power supply terminal of the control circuit. Is held in a closed state, the power supply to the power supply terminal of the control circuit can be continued even if the ignition switch has a poor contact after the control circuit is activated by the activation unit. , The control of the motor can be continuously performed, and the vehicle-mounted motor can be controlled stably.

According to the second aspect of the present invention, the holding unit is operated by the switching element as the starting unit in conjunction with the turning on of the ignition switch, and the power supply path from the battery to the regulator by the operation of the holding unit. Is closed, it is possible to reliably start the control circuit.

According to the third aspect of the present invention, when the ignition switch is turned on, the above-described power supply path for connecting the battery and the regulator is closed, and when the power supply path is closed, the power supply path via the regulator is closed. Since power is supplied to the power supply terminal of the control circuit, the control circuit can be reliably started.

According to the fourth aspect of the present invention, even if poor contact of the ignition switch occurs after the activation of the control circuit by the activation unit, the DC brushless motor for power steering is controlled by the PWM control of the control circuit. The control is continuously performed, and thereafter, the stable assist torque in the power steering can be continuously generated.

[Brief description of the drawings]

FIG. 1 is a connection diagram of a first embodiment of the present invention.

FIG. 2 is a partial connection diagram of the first embodiment of the present invention.

FIG. 3 is a partial connection diagram of a second embodiment of the present invention.

FIG. 4 is a connection diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 control circuit 2 motor for power steering (motor for vehicle) 10 APC circuit 11 regulator 12 ignition switch 13 battery 101, 108 starting unit 102, 105 holding unit 106 power supply path 107 OR circuit

Claims (4)

[Claims] An on-vehicle motor powered by a battery,
A control circuit for controlling the operation of the motor, wherein the control circuit supplies power to a power supply terminal thereof via a regulator when an ignition switch is turned on, and the control circuit controls the control by turning on the ignition switch. An activation unit that activates a circuit, and a holding unit that operates in response to an output of the control circuit after the activation and holds a power supply path from the battery to a power supply terminal of the control circuit in a closed state. Control device for in-vehicle motor. 2. The power supply system according to claim 1, wherein the activation unit includes a switching element that operates the holding unit in conjunction with turning on of the ignition switch, and closes a power supply path from a battery to the regulator by the operation of the holding unit by the switching element. The control device for a vehicle-mounted motor according to claim 1, wherein the control circuit is activated to start the control circuit. 3. The power supply unit, wherein the activation unit connects the battery and the regulator, and includes a power supply line that is closed when the ignition switch is turned on. The control unit controls the control unit via the regulator when the power supply line is closed. The control device for a vehicle-mounted motor according to claim 1, wherein the control circuit is activated by supplying power to a power supply terminal of the circuit. 4. The on-vehicle motor according to claim 1, wherein the on-vehicle motor is a DC brushless motor for power steering, and is PWM-controlled by the control circuit. Motor control device.