JP2002255052A - Auxiliary machine drive device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an electric motor and restrain the consumption of battery power in a hybrid auxiliary machine drive device comprising two pump drive sources of an engine and the motor. SOLUTION: This device comprises the two pump drive sources of the engine E and the motor M for driving a fluid pump 1 of the auxiliary machine. The pump 1 is a variable displacement type and the capacity of the pump 1 is decreased when the pump 1 is driven only by the motor M. The engine E and the motor M preferably serve also as two traveling drive sources for a hybrid vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system for an auxiliary machine of a vehicle, and more particularly to a hybrid auxiliary machine drive system including an engine and an electric motor as a drive source of a fluid pump for the auxiliary machine.

[0002]

2. Description of the Related Art Generally, power steering,
It is equipped with various auxiliary equipment such as air conditioners and auxiliary air devices. These accessories are usually driven by a driving force from an engine. That is, in the power steering, a hydraulic pump is provided to generate a driving hydraulic pressure, and the hydraulic pump is connected to a crankshaft of the engine via a V-belt, a pulley, and the like, and is driven by the engine. Similarly, in an air conditioner, the compressor for the air conditioner is driven by the engine, and in the auxiliary air device, the compressor for the auxiliary air device is driven by the engine to generate high-pressure air and accumulate the pressure in the air tank.

[0003]

However, since these auxiliary machines obtain driving force from the engine, they cannot be driven in principle when the engine is stopped. In particular, in a hybrid vehicle having two driving sources, an engine and an electric motor, the engine may be stopped and the vehicle may be driven only by the electric motor. At this time, the auxiliary machine cannot be driven. Therefore, the power steering and the air conditioner cannot be used, and the air pressure cannot be supplemented to the air tank in the auxiliary air device.

In order to solve this problem, a dedicated motor for driving auxiliary equipment is provided for each auxiliary equipment in a normal vehicle or a hybrid vehicle, and the auxiliary equipment is driven by the dedicated motor when the engine is stopped (Japanese Patent Laid-Open No. 11-268522). , JP
1-98601), when the engine is stopped in a hybrid vehicle, an auxiliary machine is driven by a driving motor (Japanese Patent Application Laid-Open Nos. 7-315059 and 8-324262). There is a prior art.

[0005] However, the former has a disadvantage that the cost is increased because a dedicated motor is required for each accessory. In the latter case, a complicated switching mechanism using a one-way clutch, differential gear, etc. is required to prevent the drive interference of the engine and the motor, in order to always selectively apply the driving force of either the engine or the motor to the auxiliary equipment. However, there is a disadvantage that the cost is increased.

It is to be noted that a method in which the auxiliary machine is driven only by a dedicated motor without being driven by an engine is conceivable. However, this method consumes battery power at all times, resulting in an increase in battery capacity and an increase in cost.

Auxiliary fluid pumps such as hydraulic pumps and compressors are originally driven by an engine, and are set to have a large cylinder capacity (discharge amount) to cope with a wide range of engine speed. The capacity is constant. When such a fluid pump is driven by a motor, a motor torque proportional to the cylinder capacity is required, so that the motor becomes unnecessarily large and costly. In addition, this causes the peripheral devices to become large, and the consumption of battery power progresses quickly. Therefore, there is a problem that the battery capacity becomes large and the cost increases.

Accordingly, the present invention was devised in view of the above-mentioned problems, and an object of the present invention is to provide a hybrid accessory driving device having two pump driving sources, an engine and an electric motor, in which the size of the motor is reduced and the battery power is reduced. The purpose is to reduce consumption.

[0009]

An auxiliary device driving apparatus for a vehicle according to the present invention includes two pump driving sources, an engine and an electric motor, for driving a fluid pump of the auxiliary device. When the fluid pump is driven only by the electric motor, the capacity of the fluid pump is reduced.

[0010] Here, the engine and the electric motor may also serve as two traveling drive sources in a hybrid vehicle.

Further, the auxiliary machine may be a power steering, and the fluid pump may be a hydraulic pump for generating a driving oil pressure for the power steering.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an accessory driving device for a vehicle according to this embodiment. Here, the auxiliary equipment is power steering,
A hydraulic pump for generating the driving oil pressure is shown as a power steering pump 1. Two driving sources, the engine E and the electric motor M, are provided as driving sources of the power steering pump 1. That is, this is the configuration of the hybrid accessory drive system.
However, for simplicity of description, the vehicle is a normal vehicle that is not a hybrid, and the electric motor M is a motor dedicated to the power steering pump.

The power steering pump 1 has a pump shaft 2 for inputting a rotational driving force. The pump shaft 2 is provided so as to penetrate the power steering pump 1, and both ends of the pump shaft 2 project from the power steering pump 1. One end of the pump shaft 2 protruding to the left is connected to the crankshaft 6 of the engine E via V pulleys 3 and 4 and a V belt 5. Such a connecting means may be a chain / sprocket mechanism or a gear mechanism. The other end of the pump shaft 2 protruding to the right
It is connected to an electric motor M via a speed reducer 7.

The electromagnetic clutch 8 serving as clutch means is provided in the V-pulley 3 driven side that is attached to one end of the pump shaft 2. This is for disconnecting the connection between the V pulley 3 and the pump shaft 2. Various types of clutch means, such as a hydraulic multi-plate clutch, can be used as long as they can be electronically controlled.

In particular, unlike the related art, the power steering pump 1 is of a variable displacement type, and the discharge amount, that is, the cylinder capacity can be changed by operating the internal discharge amount adjusting shaft. The power steering pump 1 is provided with an electric actuator 9 as an actuator for automatically operating the discharge amount adjusting shaft.

A controller 10 is provided to control the entire apparatus. The controller 10 is an electromagnetic clutch 8
On / off control, operation control of the electric actuator 9, and rotation control of the electric motor M. Engine E
The operation / stop of the engine is determined from the output of the engine rotation sensor 11 provided in the CPU.

Next, the operation of the present embodiment will be described.

Normally, while the engine is running, the electromagnetic clutch 8
Is turned on, that is, in contact, and the power steering pump 1 is driven by the driving force of the engine. As a result, a driving oil pressure for the power steering is generated, and the power steering can be operated. At this time, the electric actuator 9 is operated so that the power steering pump 1 has a large capacity, for example, about 8 cc.
The power steering pump 1 is adapted to handle all engine speeds, especially the maximum speed.

Next, when the engine is stopped, the power steering pump 1
If you want to drive As shown in FIG. 2, when the engine stop is detected from the output of the engine rotation sensor 11 (step 101), the electromagnetic clutch 8 is turned off.
That is, it is cut off (step 102), so that the rotation of the pump shaft 2 is not transmitted to the engine E. Then, the electric actuator 9 is operated to reduce the capacity of the power steering pump 1 to, for example, about 3 cc (step 103). Thereafter, the motor M is rotated, and the rotational driving force of the motor M is transmitted to the power steering pump 1 via the speed reducer 7 (step 1).
04). As a result, a driving oil pressure for the power steering is generated, and the power steering can be operated. Since the electromagnetic clutch 8 has already been disengaged, the pump shaft 2 idles with respect to the V pulley 3 and the pump shaft 2
This can prevent the engine E from being driven.

According to this, when the power steering pump 1 is driven only by the motor M when the engine is stopped, the capacity of the power steering pump 1 can be reduced. Therefore, the power steering pump 1 can be driven by the small motor M, and the motor M can be reduced in size. Can be As a result, costs can be reduced and peripheral devices can be downsized. Also, the consumption of battery power is reduced, which is advantageous for reducing the battery capacity, reducing costs, and saving energy.

Here, in a non-hybrid ordinary vehicle, there is almost no need to operate the power steering when the engine is stopped. Therefore, the above-described embodiment is substantially applicable to a hybrid vehicle having two traveling drive sources of an engine and an electric motor. It makes sense. That is, in a hybrid vehicle, there is a mode in which the engine is stopped and the vehicle runs only with the motor,
At this time, in the above embodiment, the power steering pump 1 can be sufficiently driven by a small dedicated motor. On the other hand, if the dedicated motor is abolished and the motor M is also used as a drive motor, the number of parts can be reduced and cost can be further reduced. Also in this case, the capacity of the power steering pump 1 can be reduced, so that the power steering pump 1 can be sufficiently driven with a small amount of power, and the battery power for traveling is not wastefully consumed. Can greatly contribute to In general, in a hybrid vehicle, a motor generator (rotary electric machine) having a power generation function in a traveling drive motor is generally used, and such a motor generator may be used.

However, when the auxiliary equipment is an air conditioner, an auxiliary air device, or the like, driving may be required when the engine is stopped. In such a case, the above embodiment can sufficiently cope with such a case. Of course, as a hybrid vehicle, the auxiliary drive motor can also be used as the travel drive motor.

In this embodiment, the power steering pump 1 is driven by the engine E while the engine is rotating, and the power steering pump 1 is driven by the motor M only when the engine is stopped. In this embodiment, the input switching does not require a complicated switching mechanism as in the related art, and requires only a simple clutch means (electromagnetic clutch 8). Therefore, the structure is simple, small, and low in cost.

As described above, the embodiments of the present invention are not limited to those described above. For example, a modified example in which the fluid pumps of a large number of auxiliary machines are driven by one engine or motor is also possible.

[0026]

The present invention exhibits the following excellent effects.

(1) In a hybrid accessory drive device provided with two pump drive sources of an engine and an electric motor, the size of the motor can be reduced and the consumption of battery power can be reduced.

(2) It is advantageous for miniaturization and cost reduction of peripheral devices and battery capacity.

(3) A hybrid auxiliary device driving device suitable for a hybrid vehicle can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an accessory driving device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the accessory drive device when the engine is stopped.

[Explanation of symbols]

 1 Power steering pump E Engine M Electric motor

Claims (3)

[Claims] 1. An engine and an electric motor for driving a fluid pump of an auxiliary machine, comprising two pump driving sources, wherein the fluid pump is of a variable displacement type and the fluid pump is driven only by the electric motor. An auxiliary drive device for a vehicle, wherein the capacity of a fluid pump is reduced. 2. The accessory drive device for a vehicle according to claim 1, wherein the engine and the electric motor also serve as two traveling drive sources in a hybrid vehicle. 3. The power steering device, wherein the auxiliary device is a power steering.
3. The accessory driving device for a vehicle according to claim 1, wherein the fluid pump is a hydraulic pump for generating a driving oil pressure for the power steering.