JP2002201975A - Driving device of auxiliary machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device of an auxiliary machine for a vehicle capable of realizing the driving of low speed and high torque necessary as a function of a starter motor of an engine, and the driving of high speed and low torque necessary for driving the auxiliary machine by one motor. SOLUTION: The motor 4 is operatably connected to the engine 1 and a compressor 7 through a power transmitting mechanism 3. The compressor 7 is switchable between a driving condition by the engine 1 and a driving condition by the motor 4. A three-phase AC rotating machine is used as the motor 4, and controlled by a controller 20 through a gate driving circuit 21 and an inverter 14. When the motor 4 is used as the starter motor, the motor 4 is driven in three phases, and when the compressor 7 is rotated at a high speed by the power from a battery 15 during the stop of the engine 1, the motor 4 is driven in two-phase. The motor 4 acts as a generator during the driving of the engine 1, and the battery 15 is charged by the generated power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for an auxiliary device for a vehicle, and more particularly, to driving the auxiliary device for a vehicle with a motor operatively connected to an engine via a power transmission mechanism having a clutch. The present invention relates to a driving device for a vehicle accessory that uses the motor as a starter motor when the engine is started.

[0002]

2. Description of the Related Art As a driving device for a vehicle auxiliary machine of this type, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 9-324668. In this device, a compressor of a refrigeration circuit of a vehicle air conditioner is driven by an engine when the engine is driven, is driven by a motor when the engine is stopped, and the motor is used as a starter motor when the engine is started. I have. This drive device has clutches between the motor and the engine and between the motor and the compressor to drive the motor with the motor and the compressor disconnected when the engine is started. I have.

Japanese Patent Application Laid-Open No. 2000-142091 discloses that an electric compressor driven only by a motor without being driven by an engine is used for a compressor of a refrigeration circuit of a vehicle air conditioner. That use a starter motor for a vehicle has been proposed.

[0004]

When starting the engine in the above two conventional devices, the motor is driven in a state in which the clutch provided between the motor and the compressor is disengaged.
The load on the motor is reduced. However, in order to use the motor as a starter motor of an engine, a function of driving the motor at a low speed and a large torque is required, and when driving a compressor, a function of driving the compressor at a high speed is required. When driving at high speed, the torque may be small, but in the conventional configuration, no special consideration is given to reducing the torque at high speed operation, so a large-capacity motor needs to be used as the motor, which is expensive. Is heavy and
There is a problem that the physique also increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to increase the low-speed and large-torque required by one motor as a function of an engine starter motor without increasing the motor capacity. It is an object of the present invention to provide a driving device for a vehicle accessory that can realize driving and driving at high speed and small torque required for driving the accessory.

[0006]

According to the first aspect of the present invention, there is provided an engine capable of generating a driving force for running a vehicle and a power transmission mechanism having a clutch. A motor that is operatively connected to the engine, is configured to be capable of switching the number of phases or the number of poles, drives a vehicle accessory at least when the engine is stopped, and is used as a starter motor when the engine is started; A control device for controlling a motor, the control device driving the motor in a state where the number of phases or poles is large when the motor is used as a starter motor. When the vehicle accessory rotates at a high speed, it is controlled so as to be driven with a small number of phases or poles.

In the present invention, the motor is used as a motor for driving an auxiliary machine and a starter motor for starting the engine. When driving the accessory at a high speed by the motor, the torque is reduced because the motor is driven with a small number of phases or poles. When the motor is used as a starter motor of an engine, the motor is driven in a state where the number of phases or the number of poles is large. Therefore, it is possible to realize a low-speed driving with a large torque and a high-speed driving with a small torque without increasing the capacity of the motor. as a result,
It is suitable when applied to a compressor constituting a refrigeration circuit of a vehicle air conditioner as an accessory.

According to a second aspect of the present invention, in the first aspect of the invention, the vehicle accessory is configured to be switchable between a state driven by the engine and a state driven by the motor. Have been. According to the present invention, when the engine is driven, the vehicle accessory is driven by the engine, and when the engine is stopped, the accessory is driven by the motor. Therefore, the life of the battery as a power source for driving the motor can be extended.

According to a third aspect of the present invention, in the first or second aspect, the control means includes an inverter and stops the output of a part of the inverter to reduce the number of phases of the motor. Switch. In the present invention, the motor is driven in a state where the number of phases is small by stopping a part of the output of the inverter that supplies power to the motor. Therefore, by changing the control program of the inverter, it is possible to easily switch the number of phases of the motor and control the driving of the motor with the required torque and speed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, the present invention is applied to an apparatus provided with a compressor constituting a refrigeration cycle of a vehicle air conditioner (hereinafter, referred to as an air conditioner) as a vehicle accessory. A first embodiment will be described with reference to FIGS.

As shown in FIG. 1, a motor 4 is operatively connected to an engine (internal combustion engine) 1 as a driving source of the vehicle via a power transmission mechanism 3 having a clutch 2. The power transmission mechanism 3 includes a pulley 5 that is integrally rotatably connected to a crankshaft 1 a of the engine 1 via a clutch 2.
And a pulley 6 fixed to an output shaft 4a of the motor 4, a pulley 8 fixed to a drive shaft 7a of a compressor 7 as an auxiliary machine for a vehicle, and a pulley 5, 6 And a belt 9. As the clutch 2, an electromagnetic clutch is used.

The compressor 7 and the external refrigerant circuit 10 constitute a refrigeration cycle of the air conditioner. The external refrigerant circuit 10 includes, for example, a condenser (condenser) 11, an expansion valve 12 as a pressure reducing device, and an evaporator (evaporator) 13. The compressor 7 sucks and compresses the refrigerant gas guided from the evaporator 13 to the suction chamber, and discharges the compressed gas to the discharge chamber. The high-pressure gas in the discharge chamber is sent to the condenser 11. The expansion valve 12 autonomously feedback-controls its own valve opening based on the temperature and pressure of the refrigerant detected by the temperature-sensitive cylinder provided near the outlet of the evaporator 13 to condense the refrigerant corresponding to the cooling load. The refrigerant is supplied from the heater 11 to the evaporator 13 to directly control the flow rate of the refrigerant in the external refrigerant circuit 10. The compressor 7 is configured so that its capacity can be controlled by an external control signal.

A three-phase AC rotating machine is used for the motor 4,
It is connected to a battery 15 via an inverter 14. The motor 4 is rotated via the power transmission mechanism 3 when the engine 1 is driven to function as a generator, and the generated power is charged in the battery 15. When the engine 1 is stopped, power is supplied from the battery 15 so that the motor 4 Function as That is, the motor 4 is a motor generator.

As shown in FIG. 2, the inverter 14 includes six transistors T1 to T6 as switching elements, and the upper three transistors T1 to T6 in FIG.
3 is connected to the positive pole side of the battery 15 and the lower 3
The emitters of the transistors T4 to T6 are connected to the battery 15
Is connected to the negative pole side of The emitters of the upper transistors T1 to T3 and the lower transistor T
The connection points of the collectors 4 to T6 with the collectors are U-phase, V-phase, and W-phase output terminals U, V, and W, respectively. The windings (coils) 16 to 18 of the motor 4 are star-connected and connected to output terminals U, V, W of the inverter 14. A capacitor 19 is connected between the windings 17 and 18 connected to the output terminals V and W.

The clutch 2 and the inverter 14 are connected to a control device 20. The control device 20 is a CPU, RO
A computer (not shown) having an M, a RAM, an interface, and the like is provided. Then, the control device 20 operates based on the program stored in the program memory. The program memory stores a control program for using the motor 4 as a starter motor of the engine 1 and a control program for driving the compressor 7 while the motor 4 is stopped.

The control device 20 is connected to the gate drive circuit 21 via an interface (not shown), and controls the inverter 14 via the gate drive circuit 21. Control device 2
0 controls the inverter 14 to drive the motor 4 in three phases when the motor 4 is used as a starter motor,
When the compressor 7 is operated at high speed, the inverter 1 is driven so that the motor 4 is driven in two phases (U-phase and V-phase in this embodiment).
4 is controlled. The inverter 14, the control device 20, and the gate drive circuit 21 constitute control means. That is, in this embodiment, the control means includes the inverter 14 and switches the number of phases of the motor 4 by stopping the output of a part of the inverter 14.

The control device 20 includes an output signal of a rotation speed sensor 22 mounted on the motor 4 and a switch 23 of the air conditioner.
The control device 20 controls the clutch 2 and the inverter 14 based on the ON / OFF signal and the output signal of the ignition switch 24. In addition,
An air conditioner control device (not shown) for the air conditioner is provided separately. When the engine 1 is started, the air conditioner control device controls the compressor 7 so as to have a small operating capacity by a command from the control device 20.

Next, the operation of the above-configured device will be described. When the ignition switch 24 of the vehicle is turned on, the control device 20 starts executing the control program of the motor 4. When the ignition switch 24 is operated from the ON position to the start position, an excitation signal is output to the clutch 2 to drive the motor 4 as a starter motor of the engine 1 and the clutch 2 is connected.
Is controlled via the gate drive circuit 21 to drive the inverter 14 in three phases. Then, the DC power of the battery 15 is converted into three-phase AC power by the inverter 14 and supplied to the motor 4, and the motor 4 is driven at a low speed with a large torque, and the engine is started. When the motor 4 is used as a starter motor, it is preferable to drive the motor 4 with the discharge capacity of the compressor 7 reduced.

After the engine 1 is started, the rotation speed sensor 22
When it is confirmed from the output signal that the engine 1 has reached a predetermined rotation speed (for example, idle rotation speed) or more, the control device 20 determines that the start of the engine 1 has been completed, and the motor 4 serves as a generator. In order to function, the power supply to the motor 4 is stopped, and the inverter 14 is controlled so that the AC power generated by the motor 4 becomes DC power and charges the battery 15.

FIG. 3 is a time chart showing the relationship between the running of the vehicle and the driving states of the engine 1, the clutch 2, the compressor 7, the motor 4, and the starter. The control device 20 determines whether the air conditioner is on or off based on the signal of the switch 23. When the air conditioner and the engine 1 are on, the motor 4 is turned off and the clutch 2 is turned on (connected). Hold. At this time, the compressor 7 is driven by the engine 1, the motor 4 functions as a generator, and the battery 15 is charged.

For example, when the switch 23 of the air conditioner is in the ON state in a state where the engine 1 is stopped by idling stop, the control device 20 drives the compressor 7 by the motor 4, so that the gate drive circuit 21 and the inverter 14 The motor 4 is controlled to supply electric power to the motor 4 via the motor 4, and the motor 4 is driven at a desired rotation speed. At this time, clutch 2 is off
Held in state. When the compressor 7 is driven at a high speed, the motor 4 is driven in two phases of a U phase and a V phase. When the compressor 7 is driven at a low speed, the motor 4
It is driven in three phases: phase, V phase and W phase.

While the engine 1 is stopped, the compressor 7 is
When the engine 1 is started again from the state of driving, the motor 4 is stopped once, the clutch 2 is connected, and the motor 4 is used as a starter motor in that state.

This embodiment has the following effects. (1) When the motor 4 for driving the compressor 7 is configured to be usable also as a starter motor of the engine 1, a motor capable of switching the number of phases is used as the motor 4, and when the motor 4 is used as a starter motor, When the compressor 7 is driven at a high speed and the compressor 7 is rotated at a high speed, the compressor 7 is controlled to be driven at a low number of phases. Accordingly, it is possible to realize low-speed, high-torque driving and high-speed, low-torque driving without increasing the capacity of the motor 4, and to function well as a driving motor and a starter motor for the compressor 7. Can be.

(2) A multi-phase motor is used as the motor 4, the drive of the motor 4 is controlled via the inverter 14, and the number of phases of the motor 4 is switched by stopping the output of a part of the inverter 14. . Therefore, by stopping the output of a part of the inverter 14 that supplies power to the motor 4, the motor can be driven in a state where the number of phases is small.
As a result, by changing the control program of the inverter 14, it is possible to easily switch the number of phases of the motor 4 and control the driving of the motor 4 with necessary torque and speed.

(3) Since a three-phase motor is used as the motor 4, a general-purpose motor can be used and the cost is reduced. (4) The capacity of the compressor 7 can be controlled by an external control signal. When the motor 4 is used as a starter motor, the motor 4 is driven with the capacity of the compressor 7 reduced. Is done. Therefore, the load applied to the motor 4 is reduced, and the power consumption of the motor 4 is reduced.

(5) The compressor 7 is configured to be switchable between a state driven by the engine 1 and a state driven by the motor 4, and when the engine is driven, auxiliary equipment for the vehicle is driven by the engine. . Therefore, the motor 4
The life of the battery 15 as a power source for driving the motor 4 can be extended as compared with an electric compressor that drives the compressor using only the compressor.

(6) An AC rotating machine is used for the motor 4 and is operatively connected to the engine 1 via the clutch 2 and the power transmission mechanism 3.
Function as a generator, and the generated power is charged in the battery 15. Therefore, there is no need to provide an alternator.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. This embodiment differs greatly from the previous embodiment in that the motor is formed integrally with the compressor. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, the compressor 7 is joined and fixed to a cylinder block 31, a front housing 32 fixed to the front end thereof, and a rear end of the cylinder block 31 via a valve forming body 33. And a rear housing 34. The cylinder block 31, the front housing 32, and the rear housing 34 constitute a housing of the compressor 7. In FIG. 4, the left side of the drawing is the front, and the right side of the drawing is the rear.

A motor 4 is provided at the front end of the front housing 32.
Are fixedly joined. The housing of the motor 4 includes a front housing 35 and a rear housing 36.
, And the front housing 32 of the compressor 7 is fixedly fastened to both housings 35 and 36 by bolts 37. Therefore, the housing of the compressor 7 is
Is easily detachable from the housing.

A housing chamber 38 is defined between the front housing 35 and the rear housing 36, and the output shaft 4a penetrates the housing chamber 38 and one end projects from the front end of the front housing 35.
It is rotatably supported between six. A rotor 39 is fixed on the output shaft 4a in the accommodation chamber 38 so as to be integrally rotatable. A stator (stator core) 40 on which the windings 16 to 18 are wound is provided on an inner peripheral surface of the accommodation chamber 38 with a rotor 39.
Are arranged so as to surround the.

The front end of the output shaft 4a and the front housing 3
5, a known electromagnetic clutch 41 is provided.
The electromagnetic clutch 41 includes a pulley 42, and the pulley 42
The supporting cylinder of the front housing 35 is rotatably supported via a bearing 43, and a belt 9 is mounted around the outer periphery thereof. When the solenoid 41a is excited, the output shaft 4a can rotate integrally with the pulley 42.

The compressor 7 has the same configuration as a known variable displacement type swash plate type compressor. A drive shaft 7 a is rotatably supported so as to pass through the crank chamber 44. At the front end, the drive shaft 7a is directly connected to the rear end of the output shaft 4a of the motor 4 at a coaxial position so as to be integrally rotatable by means of easy attachment / detachment such as uneven fitting or screwing.

A lug plate 45 is fixed on the drive shaft 7a in the crank chamber 44 so as to be integrally rotatable. In the crank chamber 44, the swash plate 46 is attached to the drive shaft 7a.
Are slidably and tiltably supported.
The hinge mechanism 47 is interposed between the lug plate 45 and the swash plate 46. The swash plate 46 can be rotated synchronously with the lug plate 45 and the drive shaft 7a by hinge connection with the lug plate 45 via the hinge mechanism 47 and by supporting the drive shaft 7a, and the axis of the drive shaft 7a. It can be tilted with respect to the drive shaft 7a while being slid in the L direction.

A plurality of (only one is shown in the drawing) cylinder bores 31 a
It is formed so as to surround a. The single-headed piston 48 is reciprocally accommodated in each cylinder bore 31a. The front and rear openings of the cylinder bore 31a are closed by the valve body 33 and the piston 48, and a compression chamber whose volume changes in accordance with the reciprocation of the piston 48 is defined in the cylinder bore 31a. Each piston 4
8 is moored to the outer peripheral portion of the swash plate 46 via a shoe 49. Accordingly, the swash plate 46 accompanying the rotation of the drive shaft 7a is provided.
Is converted into a reciprocating linear motion of the piston 48 via the shoe 49.

A suction chamber 50 and a discharge chamber 51 are formed between the valve body 33 and the rear housing 34, respectively. The discharge chamber 51 and the suction chamber 50 are connected outside the compressor 7 by the external refrigerant circuit 10. The shut-off valve 52 is provided on a refrigerant passage between the discharge chamber 51 of the compressor 7 and the condenser 11 of the external refrigerant circuit 10. The shutoff valve 52 shuts off the refrigerant passage when the pressure of the discharge chamber 51 becomes lower than a predetermined value, and stops the circulation of the refrigerant via the external refrigerant circuit 10.

The compressor 7 adjusts the internal pressure of the crank chamber 44 by using the electromagnetic control valve 53 so that the inclination angle of the swash plate 46 is close to the maximum inclination angle (the state shown in FIG. 4) but not zero. Can be set to an arbitrary angle between the minimum inclination angle and the minimum inclination angle. The electromagnetic control valve 53 is provided in the middle of an air supply passage 54 that connects the discharge chamber 51 and the crank chamber 44, and changes an opening degree of the air supply passage 54. The crank chamber 44 and the suction chamber 50 are connected via a bleed passage 55. By changing the valve opening of the electromagnetic control valve 53 by adjusting the amount of power supplied to the solenoid 53a, the air supply passage 54 is changed.
The amount of high-pressure discharge gas introduced from the discharge chamber 51 into the crank chamber 44 through the suction chamber 50 is adjusted, and the internal pressure of the crank chamber 44 is Is determined. In accordance with the change of the internal pressure of the crank chamber 44, the difference between the internal pressure of the crank chamber 44 via the piston 48 and the internal pressure of the cylinder bore 31a is changed, and the inclination angle of the swash plate 46 is changed. The stroke, that is, the displacement is adjusted.

The opening degree of the electromagnetic control valve 53 is determined based on external information from the external information detecting means 56 (on / off information of the air conditioner switch, vehicle room temperature information, set temperature information, etc.).
It is controlled by the capacity control device 57.

For example, when the opening of the electromagnetic control valve 53 is reduced, the internal pressure of the crank chamber 44 is reduced, and the piston 4 between the internal pressure of the crank chamber 44 and the internal pressure of the cylinder bore 31a is reduced.
8, the swash plate 46 is tilted in the direction of increasing the tilt angle, and the displacement of the compressor 7 is increased. vice versa,
When the opening of the electromagnetic control valve 53 is increased, the crank chamber 4
4, the difference between the internal pressure of the crank chamber 44 and the internal pressure of the cylinder bore 31a via the piston 48 increases, and the swash plate 46 tilts in the direction of decreasing the inclination angle, and the compressor 7
Is reduced. The electromagnetic control valve 53
The power of the battery 15 is also used for controlling power supply to the (solenoid unit 53a) and for powering various other electrical components of the vehicle (not shown).

In this embodiment, similarly to the above-described embodiment, the motor 4 functions as a starter motor (function) or the compressor 7 operates in such a manner as to maintain the relationship shown in the time chart of FIG. The electromagnetic clutch 41 and the motor 4 are controlled so as to fulfill a role (function) as a driving motor.

This embodiment has the following effects in addition to the effects (1) to (5) of the above embodiment. (7) Since the motor 4 is formed integrally with the compressor 7, compared with a configuration in which the motor 4 and the compressor 7 are separately formed, an operation connection configuration with the engine 1 via the power transmission mechanism 3. Becomes easier.

(8) Since the electromagnetic clutch 41 is provided on the motor 4 side of the power transmission mechanism 3, the electromagnetic clutch 4
As compared with the case where the motor 1 is provided on the engine 1, the wiring between the electromagnetic clutch 41 and the control device 20 and the wiring between the motor 4 and the control device 20 are simplified.

(9) The housing of the compressor 7 is a motor 4
The drive shaft 7a of the compressor 7 is easily detachable from the output shaft 4a of the motor 4. Therefore, it is possible to easily cope with a case where a compressor having another configuration, for example, a compressor or a scroll compressor in which the inclination angle of the swash plate 46 is constant is used.

The embodiment is not limited to the above, and may be configured, for example, as follows. ○ In the first embodiment, the engine 1 and the motor 4
In addition to the clutch 2 for interrupting / connecting the power transmission between the motor 4 and the compressor 4, a clutch for interrupting / connecting the power transmission between the motor 4 and the compressor 7 may be provided. In this case, when the motor 4 is used as a starter motor, if power transmission between the motor 4 and the compressor 7 is cut off, a load for driving the compressor 7 is not applied to the motor 4 and power consumption is reduced. Also,
There is no need to make the compressor 7 a variable displacement type and to reduce the capacity of the compressor 7 when the engine 1 starts.

The motor 4 is not limited to a three-phase AC motor, but may be a four-phase or more AC motor 4 to be used as a starter motor and to drive the compressor 7 (vehicle accessory). The number may be switched. Also in this case, when used as a starter motor, a large torque can be driven at a low speed, and when the compressor 7 (vehicle accessory) is driven, a small torque can be driven at a high speed.

In place of the configuration in which the number of phases is switched, a motor having a configuration in which the number of poles is switched may be used as the motor 4 capable of realizing low-speed driving with large torque and high-speed driving with small torque. As a configuration for switching the number of poles, there is a method in which two sets of windings having different numbers of poles are provided on the stator 40 and the connection state between the power supply and the windings is switched using a relay. When the pole ratio is changed to 1: 2, there is a method of switching the number of poles (for example, between 4 poles and 8 poles) using an intermediate tap provided in each phase of a single winding. . And
When driving at low speed and large torque, the motor is driven with a large number of poles. When driving at high speed and small torque, the motor is driven with a small number of poles. The latter method has a simpler configuration.

The power transmission between the motor 4 and the engine 1 is cut off except when the motor 4 does not have a function as a generator and is used as a starter motor,
The compressor 7 may be configured to be driven only by a motor. In this case, an alternator is provided for charging the battery 15.

When the engine 1 is stopped with the switch 23 of the air conditioner being ON, the control device 20 outputs a demagnetization command for the clutch 2 or the electromagnetic clutch 41 immediately before the stop operation of the engine 1 is started. To do.
In this case, the motor 4 can be started while the motor 4 is being coasted, and the electric power required for starting the motor 4 can be reduced.

Not only the compressor 7 but also a water pump mounted on the vehicle, a hydraulic pump for a brake assist device, a hydraulic pump for a power steering device,
The motor 4 is used to drive other vehicle accessories such as an air pump for an air suspension device and a pump for cooling fluid circulation of a cooling device for cooling the motor 4 or the battery 15 by circulating coolant. Is also good.

The inverter 14 may be configured to cool by circulating the coolant, and the coolant circulating pump may be driven together with the compressor 7. In this case, inverter 1
4 is efficiently cooled.

○ Not only the variable capacity type swash plate type compressor,
It may be applied to a double-headed or fixed-capacity type swash plate type compressor.
Further, the present invention is not limited to the swash plate compressor, and may be applied to other types of compressors such as a scroll compressor and a vane compressor.

The invention (technical idea) grasped from the above embodiment will be described below. (1) In the invention according to any one of claims 1 to 3, the vehicle auxiliary machine is a compressor constituting a refrigeration cycle of an air conditioner.

(2) In the invention according to any one of claims 1 to 3, and (1), when the engine is driven, the motor is rotated via the power transmission mechanism to function as a generator, The generated electric power is charged in the battery, and when the engine is stopped, the electric power is supplied from the battery to function as a motor.

(3) In the invention as set forth in claim 1 or 2, the motor is a pole number switching motor, and the braking means switches so as to reduce the number of poles when starting the motor.

(4) In the invention according to claim 3,
The motor is a three-phase motor, and the control means drives the motor in one of three phases and two phases.

[0056]

As described in detail above, claims 1 to 3 are described.
According to the invention described in (1), low-speed, large-torque driving required for the starter function of the engine with one motor and high-speed, low-torque driving required for driving the auxiliary equipment are performed without increasing the capacity. it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a drive control device for a vehicle accessory according to a first embodiment.

FIG. 2 is a circuit diagram showing a relationship between a motor and an inverter.

FIG. 3 is a time chart showing operations of an engine, a motor, a compressor, and the like.

FIG. 4 is a sectional view of a compressor according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Clutch, 3 ... Power transmission mechanism, 4 ...
Motor 7: Compressor as vehicle auxiliary machine, 14: Inverter constituting control means, 20: Control device, 21
... also a gate drive circuit.

Claims (3)

[Claims] 1. An engine capable of generating a driving force for running a vehicle and operatively connected to the engine via a power transmission mechanism having a clutch, wherein the number of phases or the number of poles is switchable. A drive device for a vehicle accessory, comprising: a motor used as a starter motor at least when the engine is stopped, and used as a starter motor when the engine is started; and control means for controlling the motor. The control means drives the motor in a state where the number of phases or poles is large when the motor is used as a starter motor, and in a state where the number of phases or poles is small when the vehicle accessory rotates at a high speed. A driving device for a vehicle accessory configured to be controlled to be driven. 2. The driving device for a vehicle accessory according to claim 1, wherein the vehicle accessory is configured to be switchable between a state driven by the engine and a state driven by the motor. . 3. The vehicle auxiliary machine driving device according to claim 1, wherein the control means includes an inverter and switches the number of phases of the motor by stopping output of a part of the inverter.