JP2001339987A - Drive unit for bidirectional motor for vehicle and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit for a bidirectional motor for a vehicle, which is applied to both vehicles of a 12 V battery car and a high voltage car by using common parts and structure with conventional drive units for a bidirectional motor for 12 V battery vehicles and a minor change. SOLUTION: The drive unit for the bidirectional motor for a vehicle has a first electromagnetic relay 1 and a second electromagnetic relay 3, and connecting a power source and a bidirectional motor 5 through on-off contacts (a), (c). If the first electromagnetic relay 1 is energized, the bidirectional motor 5 rotates in an A direction, and if the second electromagnetic relay 3 is energized, the bidirectional motor 5 rotates in a B direction. Each excitation coil of two electromagnetic relays 1, 3 is energized by a 12 V power source, and the power source connected to the bidirectional motor 5 through the contacts (a), (c) has a voltage of 42 V, and a power MOSFET 9 locates between the 42 V power source and the contact (a).

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 a bidirectional motor for a vehicle requiring forward and reverse bidirectional rotation, such as a motor for opening and closing a power window of a motor vehicle.
It relates to the control method.

[0002]

2. Description of the Related Art Passenger cars and other vehicles are equipped with bidirectionally rotatable motors at various locations such as a sunroof, a door lock, and a trunk rock, in addition to a power window, to perform a desired driving operation. Conventionally, as a device for driving this type of motor, for example, a circuit as shown in FIG. In the circuit shown, terminal A
Is set to H level, the bidirectional motor 5 is driven to rotate in the A direction, and when the terminal B is set to H level, the bidirectional motor 5 is driven to rotate in the B direction.

That is, when the terminal A is set to the H level, the transistor TR1 is turned on, and a current flows from the +12 V power supply through the coil terminals 1d and 1e of the electromagnetic relay 1 to excite the coil. Is switched to a state in which the contact 1a and the contact 1c are connected. As a result,
The current from the 12V power supply is sequentially applied to the contact 1 of the electromagnetic relay 1
a, it is supplied to the bidirectional motor 5 through the contact 1c, and subsequently flows out to the ground through the contact 3c and the contact 3b of the electromagnetic relay 3. As a result, the bidirectional motor 5
It is driven to rotate in the direction.

On the other hand, when the terminal B is set to the H level, the transistor TR2 is turned on, a current flows from the +12 V power supply through the coil terminals 3d and 3e of the electromagnetic relay 3, and the coil is excited, and the electromagnetic relay is turned on. 3 contacts 3
The state is switched to a state in which a is connected to the contact 3c. As a result, the current from the 12V power supply is sequentially supplied to the bidirectional motor 5 via the contacts 3a and 3c of the electromagnetic relay 3, and subsequently to the ground via the contacts 1c and 1b of the electromagnetic relay 1. Leaks to Thus, the bidirectional motor 5 is driven to rotate in the direction B opposite to the above.

[0005] Such a circuit is manufactured as a unit as a control device for each motor, and is provided for convenience in mounting on a vehicle, exchanging during maintenance, and storing inventory.

In recent years, for example, with the development of electric vehicles and the like, there has been a need for various electric components using a high-voltage battery of, for example, about 42 to 48 volts as a power source, instead of a conventional 12-volt battery. Is growing. When the power supply voltage is increased, the driving torque of the motor is increased, driving efficiency can be improved, and power consumption can be reduced. In addition, if the power consumption is the same, since power = voltage × current, the amount of current can be reduced in inverse proportion, and as a result, the wires of the wire harness can be made thinner. It can also contribute to lightweight.

[0007]

However, although the need for electrical components using a high-voltage battery as a power source is gradually increasing, vehicles equipped with a 12V battery are still large in the current market. There are many.
Therefore, from the standpoint of manufacturing the driving device of the bidirectional motor, the conventional voltage unit and the high voltage unit must be manufactured separately, and the advantage of cost reduction by mass production cannot be enjoyed. . Such a cost is ultimately borne by the user, and hinders the cost reduction of new technologies such as electric vehicles.

[0008] Moreover, even if electric vehicles will become the mainstream in the future, vehicles equipped with existing 12V batteries will continue to operate for quite a long time thereafter.
Previously standard units must also be kept in stock as maintenance parts for maintenance. Apart from components with clearly different ratings such as motors, existing general-purpose products (for example, CPUs operating at +5 V) are diverted to control devices and the like, even in high-voltage compatible drive devices. However, there is almost no difference in the configuration of the entire device unit, and a car dealer or the like has to stock such similar units, so that the burden from such a viewpoint cannot be ignored.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a vehicle equipped with a 12V battery and a high-voltage battery can be slightly modified while sharing parts and structures as much as possible with a conventional drive device for a 12V battery. It is an object of the present invention to provide a driving device for a bidirectional motor for a vehicle, which can cope with both mounted vehicles.

[0010]

According to a first aspect of the present invention, there is provided a driving apparatus for a bidirectional motor for a vehicle, comprising a first electromagnetic relay and a second electromagnetic relay. When a power supply and a bidirectional motor are connected via switching contacts of these electromagnetic relays, and the first electromagnetic relay is energized, the bidirectional motor rotates in a first direction, and the second In a drive device for a bidirectional motor for a vehicle, wherein the bidirectional motor rotates in a second direction opposite to the first direction when an electromagnetic relay is energized. The excitation coil is energized by a power supply having a first voltage value, while a power supply connected to the bidirectional motor via the on-off contact has a second voltage higher than the first voltage value. Having a second voltage value with the power supply Between the switching contacts it is characterized in that the switch means is interposed.

Generally, in an electromagnetic relay, an on / off
The size, shape, material, contact force, separation distance, and the like of the switching contact are greatly different depending on the current, voltage, switching frequency, and the like of the load to be turned off. Therefore,
When the load is a 12V driven bidirectional motor,
When using a bidirectional motor as a load, an electromagnetic relay having switching contacts having different characteristics described above must be used naturally. Therefore, when a 42V bidirectional motor is used as a load, in principle, it is necessary to use an electromagnetic relay provided with a switching contact having a rating different from that of a 12V bidirectional motor.

However, in the apparatus according to the first aspect, the switching of energization to the high-voltage driven bidirectional motor is performed by using the electromagnetic relay of the conventional standard as it is, and the switching contact of the electromagnetic relay accompanying the switching is performed. In order to prevent destruction due to overload (including the case where the rating is exceeded in some cases), additional switch means are provided.

In the present invention, the above configuration is adopted based on the following considerations. That is, the rating of the electromagnetic relay is determined by the allowable contact power, the allowable contact voltage, the allowable contact current, and the like. Therefore, when diverting the electromagnetic relay, it is necessary to examine these standard values one by one. First, as a premise,
It should be remembered that the present invention aims at replacing a motor for a power window, which has conventionally been driven at 12 V, with a motor driven at 42 V. That is, although the object to be moved (for example, a window glass) is the same even though it corresponds to the high-voltage battery, the required power does not increase, and instead, as described in the related art, the motor is used. The power consumption is reduced by the improvement of the efficiency. Therefore, regarding the contact allowable power, there is no problem if the electromagnetic relay used for the motor driven by 12 V is used as it is. In addition, since the current value decreases in inverse proportion to the increase in the voltage, the allowable current of the contact can be diverted to the conventional product without any problem. Therefore, it can be said that the conventional electromagnetic relay can be used as long as the inconvenience caused by the overload of the contact allowable voltage exceeding the rating can be avoided.

Considering the contact allowable voltage a little, in the case of an electromagnetic relay, when the current or voltage at the contact exceeds a certain limit, a discharge occurs and energy is consumed at the contact, whereby the metal evaporates. Contacts wear out. Particularly at a high voltage, there is a danger that the arc discharge will not be cut off and a short circuit (dead short circuit) will occur (for example, FIG. 4).
(B)). For this reason, the contact allowable voltage is defined from the viewpoint of the upper limit voltage at which the contact can withstand consumption due to the discharge at the time of current disconnection and the upper limit at which the arc discharge can be reliably shut off when the contact is opened to prevent dead short. is there.

Thus, if the switching off of the electromagnetic relay is abandoned to cut off the current, the problems of early consumption and dead short due to discharge can be avoided, and there is no problem with other standard values as described above. Therefore, the electromagnetic relay used for the motor driven by 12 V can be used as it is even at a high voltage.

Accordingly, in the present invention, the current is not cut off by an electromagnetic relay but by a switch means interposed between the power supply and the switching contact.

If the size of the switching contact increases, the exciting coil must have a capacity as large as possible. However, the exciting voltage of the exciting coil (coil rated voltage) and the drive voltage of the load are directly determined. Does not matter. In fact, in the conventional vehicle bidirectional motor driving device, the voltage supplied to the excitation coil of the electromagnetic relay and the voltage driving the bidirectional motor are both 12 V, and it is necessary to provide a difference between the two supply voltages. Sex does not exist by nature.

However, in the device according to the first aspect, the first voltage is used to excite the electromagnetic relay, and the higher second voltage is used to drive the bidirectional motor. .

Specifically, the first voltage is 12 volts and the second voltage is 4 volts.
It is assumed that it is 0 volt or more.

According to the first or second aspect of the present invention, when a high-voltage driven bidirectional motor is used in a high-voltage battery-equipped vehicle, a conventional bidirectional motor-based bidirectional motor is directly used. It becomes possible to use a motor drive device, and modifications for high voltage use are limited to the addition of a small part by adding a switch means.

More specifically, in order to make the unit of the drive device of the conventional bidirectional motor for a vehicle compatible with the use of a high-voltage battery, a switch means is additionally provided in the unit of the drive device of the conventional bidirectional motor. Then, it is only necessary to disconnect the wiring connected to the switching contact of the electromagnetic relay from the 12V battery and change the wiring so that the switching contact of the electromagnetic relay is connected to the high-voltage battery via the switch means. .

Therefore, more practically, when manufacturing a unit of a drive device for a bidirectional motor for a vehicle, 12 units are required.
While using a V voltage unit as a base, secure additional mounting points for switch means on the printed wiring board, and install jumper wires etc. so that the power supply to the switching contacts of the electromagnetic relay can be set selectively. Preferably, such a new unit is basically used for a conventional 12V vehicle,
With a small modification work, the high voltage battery can be easily shared even for a vehicle, and the burden of having a double stock according to the battery voltage is eliminated.

In the apparatus according to the first or second aspect, the purpose of providing the switch means is to cut off the current when switching the rotation of the bidirectional motor without using the on-off contact of the electromagnetic relay. Therefore, the switch means is not limited as long as it can safely and reliably shut off the current of the bidirectional motor driven at a high voltage, and is, for example, a relatively large electromagnetic relay having a high contact allowable voltage. May be used.

According to a third aspect of the present invention, in the driving device for a two-way motor for a vehicle according to the first or second aspect, the switching means is a semiconductor switching element. I have.

In the device according to the third aspect, a semiconductor switching element is employed as the switch means.
2. Description of the Related Art In recent years, semiconductor switching elements have rapidly become widespread, and large-capacity and small-sized ones are available at low prices. Further, the performance with respect to a surge withstand voltage at the time of current interruption required for an application such as the present invention is also improved. It is needless to say that a known method such as connecting a varistor in parallel with the semiconductor switching element to absorb the surge voltage may be adopted.

In particular, for the purpose of the present invention, the semiconductor switching element is preferably a power MOSFET.

According to the apparatus described in claim 3 or 4,
Since a semiconductor element is used as the switch means, it can be driven with a weak current compared to, for example, a case where a large capacity relay is used as the switch means. The interface with the built-in + 5V operation CPU becomes easy. In addition, since it is smaller than a large-capacity electromagnetic relay, it is suitable for being additionally mounted on a printed wiring board of a driving device of a bidirectional motor based on 12 V driving.

In the fifth and sixth aspects, the control method of the drive device of the bidirectional motor for a vehicle according to the first to fourth aspects is described.

According to a fifth aspect of the present invention, there is provided a method for controlling a vehicle bidirectional motor driving apparatus according to any one of the first to fourth aspects, wherein: When deactivating one of the first electromagnetic relay and the second electromagnetic relay, the first electromagnetic relay is deactivated after the switch unit is opened.

In the control method according to the fifth aspect, in order to achieve the desired object of the present invention, first, the switch means is opened to cut off the energization to the electromagnetic relay, and thereafter the electromagnetic relay is turned off. The switching operation is performed.

According to the control method of the fifth aspect, first, the driving current of the bidirectional motor is reliably cut or cut off by opening the switch means, and then the electromagnetic relay is deenergized and its switching contact is opened. At this time, no voltage is applied between the switching contacts at this time, and no arc discharge is caused by the opening of the contacts. Therefore, even if an electromagnetic relay with a low contact allowable voltage is used, sufficient safety and durability can be ensured without causing early wear and dead short, and a conventional dual-purpose electromagnetic relay is used. Drive control of the direction motor can be performed.

According to a sixth aspect of the present invention, there is provided a method for controlling a vehicle bidirectional motor driving apparatus according to any one of the first to fourth aspects. When energizing either the first electromagnetic relay or the second electromagnetic relay, the switch means is closed after energizing the first electromagnetic relay.

In the control method according to the sixth aspect, first, the electromagnetic relay is energized to prepare a circuit in a predetermined rotational direction of the bidirectional motor, and then the switch is closed to open and close. The power supply to the bidirectional motor is started via the contact.

According to the control method of the sixth aspect, first, the electromagnetic relay is energized to close its on-off contact to establish a circuit in the predetermined rotation direction of the bidirectional motor, and thereafter, the switch means Is closed, no voltage is applied between the switching contacts when the electromagnetic relay is initially energized. Therefore, no spark is generated at the time of contact of the contacts, and the life of the contacts of the electromagnetic relay can be extended.

The control method according to claim 5 is necessary for controlling the driving device of the bidirectional motor for a vehicle according to claims 1 to 4, whereas the control procedure according to the present invention is not necessarily required. Not required. Damage to the switching contacts and the danger of dead short-circuits occur mainly when the energizing current is cut off.Some sparks occur when the contacts are brought into contact and the energization is started. The damage is slight.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a driving device for a bidirectional motor for a vehicle according to the present invention.

FIG. 1 is a circuit diagram showing a driving device for a bidirectional motor for a vehicle.

In the figure, reference numeral 1 denotes a first electromagnetic relay, 3 denotes a second electromagnetic relay, both of which have a so-called 1c-type contact structure. The normally open contacts 1a and 3a are connected to each other and to a power MOSFET 9 described later.
The normally closed contacts 1b and 3b of the two electromagnetic relays 1 and 3 are connected to each other and to the ground. And
Between the common contact 1c of the electromagnetic relay 1 and the common contact 3c of the electromagnetic relay 3, a bidirectional motor 5 for power window that can be rotated forward and reverse is connected.

Excitation coil terminal 1 of first electromagnetic relay 1
d and the exciting coil terminal 3d of the second electromagnetic relay 3 are +
It is connected to a 12V power supply. On the other hand, the other coil terminals 1e and 3e of these electromagnetic relays 1 and 3 are N
The collectors of the PN transistors TR1 and TR2 are connected, and the emitters of the transistors TR1 and TR2 are both connected to ground. Also, the transistor TR
1 and TR2 are connected to output ports A and B of the control device 7 via current limiting resistors R1 and R2, respectively.

+42 is applied to the source of the power MOSFET 9
The power supply of V is connected, and the drain is connected to the normally open contacts 1a and 3a of the two electromagnetic relays 1 and 3 described above. The gate has a transistor TR3 and a resistor R4.
An interface circuit 11 composed of R5 is connected, and the base of the transistor TR3 receives a current output from the output port M of the control device 7 via a current limiting resistor R3.

Next, the operation of the control device 7 of the drive device for a bidirectional motor for a vehicle according to the present embodiment having the above-described configuration will be described with reference to the flowchart of FIG.

When the driver operates a power window raising / lowering switch (not shown) to open and close the power window, the controller 7 which has detected this operation (step S
1) Depending on whether the window is rising or falling (step S2), if the window is rising, the output of the output port A is set to the H level (step S3). The level is set (step S4). Less than,
The description will be made assuming that the rise is selected.

In step S3, when the control device 7 sets the output of the output port A to the H level, the transistor TR
1 is turned on, and the coil terminal 1e of the electromagnetic relay 1 is substantially in the same state as when it is connected to the ground, and the coil of the electromagnetic relay 1 is energized and shared with the normally open contact 1a. The contact 1c is connected.

Thereafter, in step S5, the output of the output port M is set to H level, and the interface circuit 1
The power MOSFET 9 is switched to the on (conducting) state through the switch 1. Then, the power supply of +42 V is changed to the power MOSF.
Via ET9, normally open contacts 1a of electromagnetic relays 1, 3
3a, the current from the + 42V power supply is sequentially passed through the power MOSFET 9, the normally open contact 1a of the first electromagnetic relay 1, and the common contact 1c of the electromagnetic relay 1, and then the bidirectional motor 5 And flows to ground via the common contact 3c of the second electromagnetic relay 3 and the normally closed contact 3b of the electromagnetic relay 3. Thereby, the bidirectional motor 5 rotates in the direction A, and raises the window glass (not shown).

Referring again to FIG. 2, while the input from the operation switch of the power window is continued, step S is executed.
6 is repeated, but when there is no input, the process proceeds to step S7, where the output of the output port M is returned to the L level to turn off (cut off) the power MOSFET 9, and then the output of the output port A is output in step S8. Is returned to the L level, and the coil of the electromagnetic relay 1 is deenergized.

As a result, as shown in the timing chart of FIG. 3, the level of the signal output from the control device 7 changes. That is, first, the output of the output port A is set to the H level (step S3), and then the first time Δ
After the time t1, the output of the output port M is set to the H level (step S5).

That is, the electromagnetic relay 1 is energized to prepare for closing the drive circuit of the bidirectional motor 5 in the direction A, and then the power MOSFET 9 is closed to set the contacts 1a and 1c.
, The power supply to the bidirectional motor 5 is started.
That is, when the electromagnetic relay 1 is initially energized, no voltage is applied between the switching contacts 1a and 1c. Therefore, no spark occurs at the time of contact of the contacts,
This can contribute to extending the life of the contact 1 a of the electromagnetic relay 1.

Further, when the rotation of the bidirectional motor 5 is stopped, as shown in the timing chart of FIG. 3, the level of the signal output by the control device 7 first returns the output of the output port M to the L level. (Step S7),
Thereafter, after a lapse of a slight second time Δt2, the output of the output port A is returned to the L level (step S8).

That is, first, the power MOSFET 9 is set to the open state, and the energization to the normally open contact 1a of the electromagnetic relay 1 is cut off, and thereafter, the deenergizing operation of the electromagnetic relay 1 is performed. Thereby, first, the bidirectional motor 5
In this case, the drive current flowing through the power MOSFET 9 is turned off to make the power MOSFET 9 open, and then the electromagnetic relay 1 is deenergized to open the contacts 1a and 1c.
No voltage is applied during 1c, and no arc discharge is caused by the opening of the contact. Therefore, even if an electromagnetic relay with a low contact allowable voltage is used, sufficient safety and durability can be ensured without causing early wear and dead short, and a conventional dual-purpose electromagnetic relay is used. Drive control of the direction motor can be performed.

In the above description, the case where the power window is raised has been described, but it can be easily understood that the same operation and effect can be obtained also when the power window is lowered.

In the present embodiment, when manufacturing the unit of the driving device of the bidirectional motor for the vehicle, the mounting positions of the power MOSFET 9 and the interface circuit 11 are prepared on the printed wiring board in advance. Parts are not mounted.

When used as a unit for a vehicle equipped with a high-voltage battery, the power MOSFET 9 and the interface circuit 11 are additionally mounted at predetermined locations prepared in advance. Thereby, the circuit configuration shown in FIG. 1 is obtained, and the adaptation to the high-voltage battery is completed.

On the other hand, when used as a conventional 12 V drive unit, a +12 V power supply is connected to the electromagnetic relay by connecting a jumper wire between the mounting position of the drain terminal of the power MOSFET and the coil terminal d of the electromagnetic relay. 1,
The wires are also supplied so as to be supplied to the three contacts 1a and 3a. Then, a motor driven by 12 V is mounted as the bidirectional motor 5. Thereby, it can be used as a drive device of a conventional bidirectional motor for a 12V battery vehicle.

As described above, the drive unit of the present embodiment can be basically used for a conventional 12V vehicle, and can be easily applied to a vehicle with a high-voltage battery by a slight modification work. be able to.

As described above, according to the drive device for a bidirectional motor for a vehicle according to the present invention, an electromagnetic relay having a low voltage rating can be diverted while ensuring a practically sufficient safety margin. By slightly modifying the driving device of the driving vehicle bidirectional motor, a driving device of the high voltage driving vehicle bidirectional motor can be obtained.

In the above-described embodiment, the advantage of sharing the unit of the drive device of the bidirectional motor for the vehicle in the case where the motor for the power window which has conventionally been driven at 12 V is replaced with a motor driven at 42 V is particularly emphasized. However, the configuration of the present invention can also be applied to driving a heavy-load bidirectional motor such as a main motor of an electric vehicle. In this case, FIG.
As compared with the circuit configuration shown in (1), a low-cost and small electromagnetic relay can be used, which can contribute to cost reduction and downsizing of the device.

That is, the embodiments described above are described for facilitating the understanding of the present invention, but are not described for limiting the present invention.
Therefore, each element disclosed in the above embodiment is
It is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[0058]

As described above, according to the drive apparatus for a bidirectional motor for a vehicle according to the present invention, an electromagnetic relay having a low voltage rating can be diverted while ensuring a practically sufficient safety margin. By slightly modifying the drive device for the 12-V drive vehicle bidirectional motor, a drive device for the high-voltage drive vehicle bidirectional motor can be obtained.

According to the first or second aspect of the present invention, when a high-voltage driven bidirectional motor is used in a vehicle equipped with a high-voltage battery, a bidirectional motor relay using a conventional electromagnetic relay as it is is used. It becomes possible to use a motor drive device, and modifications for high voltage use are limited to the addition of a small part by adding a switch means.

More specifically, in order to make the unit of the drive device of the conventional bidirectional motor for a vehicle compatible with the use of a high-voltage battery, switch means is additionally provided in the unit of the drive device of the conventional bidirectional motor. Then, it is only necessary to disconnect the wiring connected to the switching contact of the electromagnetic relay from the 12V battery and change the wiring so that the switching contact of the electromagnetic relay is connected to the high-voltage battery via the switch means. .

Therefore, more practically, when manufacturing the unit of the drive device of the bidirectional motor for a vehicle, 12 units are required.
While using a V voltage unit as a base, secure additional mounting points for switch means on the printed wiring board, and install jumper wires etc. so that the power supply to the switching contacts of the electromagnetic relay can be set selectively. Preferably, such a new unit is basically used for a conventional 12V vehicle,
With a small modification work, the high voltage battery can be easily shared even for a vehicle, and the burden of having a double stock according to the battery voltage is eliminated.

According to the apparatus described in claim 3 or 4,
Since a semiconductor element is used as the switch means, it can be driven with a weak current compared to, for example, a case where a large capacity relay is used as the switch means. The interface with the built-in + 5V operation CPU becomes easy. In addition, since it is smaller than a large-capacity electromagnetic relay, it is suitable for being additionally mounted on a printed wiring board of a driving device of a bidirectional motor based on 12 V driving.

According to the control method of the fifth aspect, first, the drive current of the bidirectional motor is surely cut or cut off by opening the switch means, and then the electromagnetic relay is deenergized and its switching contact is opened. At this time, no voltage is applied between the switching contacts at this time, and no arc discharge is caused by the opening of the contacts. Therefore, even if an electromagnetic relay with a low contact allowable voltage is used, sufficient safety and durability can be ensured without causing early wear and dead short, and a conventional dual-purpose electromagnetic relay is used. Drive control of the direction motor can be performed.

According to the control method of the sixth aspect, first, the electromagnetic relay is energized to close its on-off contact to establish a circuit in the predetermined rotation direction of the bidirectional motor, and thereafter, the switch means Is closed, no voltage is applied between the switching contacts when the electromagnetic relay is initially energized. Accordingly, there is an extremely excellent effect that no spark is generated at the time of contact of the contact, and the life of the contact of the electromagnetic relay can be extended.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a driving device of a bidirectional motor for a vehicle according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control procedure of a drive device of the bidirectional motor for a vehicle shown in FIG. 1;

FIG. 3 is a timing chart showing an operation of the vehicle bidirectional motor drive device of FIG. 1;

FIG. 4 is a diagram for explaining a configuration (a) of a driving device for a bidirectional motor for a vehicle and a problem (b) thereof according to a conventional technique.

[Explanation of symbols]

 1 First electromagnetic relay 1a Normally open contact 1b Normally closed contact 1c Common contact 1d Coil terminal 1e Coil terminal 3 Second electromagnetic relay 3a Normally open contact 3b Normally closed contact 3c Common contact 3d Coil terminal 3e Coil terminal 5 Power Window motor (bidirectional motor) 7 Control device 9 Power MOSFET (semiconductor switching means) 11 Interface circuit

Claims (6)

[Claims] 1. A first electromagnetic relay, comprising: a first electromagnetic relay and a second electromagnetic relay, wherein a power supply and a bidirectional motor are connected via switching contacts of these electromagnetic relays. Energizing the bidirectional motor rotates in a first direction, and energizing the second electromagnetic relay causes the bidirectional motor to rotate in a second direction opposite to the first direction. The exciting coil of the two electromagnetic relays is energized by a power supply having a first voltage value, while the exciting coil of the two electromagnetic relays is energized by a power supply having a first voltage value. Has a second voltage value higher than the first voltage value, and a switch means is interposed between the power supply having the second voltage value and the on / off contact. For driving a bidirectional motor for a vehicle 2. The vehicle driving apparatus according to claim 1, wherein the first voltage is 12 volts, and the second voltage is 40 volts or more. Drive device for bidirectional motor. 3. The driving apparatus for a bidirectional motor for a vehicle according to claim 1, wherein said switch means is a semiconductor switching element. 4. The driving device for a bidirectional motor for a vehicle according to claim 3, wherein the semiconductor switching element is a power MOSFET. 5. The control method for a drive device for a bidirectional motor for a vehicle according to claim 1, wherein the first electromagnetic relay or the second electromagnetic relay. The method of controlling a driving device for a bidirectional motor for a vehicle, comprising: deactivating the one electromagnetic relay after opening the switch means when deactivating the power supply. 6. The control method of a drive device for a bidirectional motor for a vehicle according to claim 1, wherein the first electromagnetic relay or the second electromagnetic relay. When energizing the vehicle, the switch means is closed after energizing the electromagnetic relay.