JP2001204104A - Device for driving auxiliary machines of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for driving auxiliary machines of an electric vehicle to make it possible to downsize a motor and to make it light in weight by driving auxiliary machines with an auxiliary-machine driving motor even when a vehicle is in a stop state. SOLUTION: This device is made up of driving motors 11, 12 that generate power for driving wheels 16, a first group 3 of auxiliary machines that are driven by the power of the driving motors 11, 12 and required to be actuated while a vehicle is traveling, a second group 4 of auxiliary machines provided with auxiliary machines of those in the first group 3 that needs to be actuated, even when the vehicle is in a stop state, and an auxiliary driving motor 28 that drives the second group 4 of the auxiliary machines only when the vehicle is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary driving device for an electric vehicle.

[0002]

2. Description of the Related Art An electric vehicle is an alternator, a power steering oil pump, an air conditioner compressor, an air brake engine, and the like, similarly to an automobile driven by an internal combustion engine.
It is necessary to drive auxiliary equipment such as an air compressor of the air suspension. All auxiliary equipment mounted on the vehicle is driven by any of the engine drive system, motor drive system, and reduction gear drive system. Are mounted and driven by the above two or three methods.

[0003] For example, Japanese Patent Application Laid-Open No.
There is one disclosed in Japanese Patent Publication No. 182210. In this drive device, a traveling drive motor and an auxiliary device driving motor are coaxially arranged, all the auxiliary devices are driven by the auxiliary device driving motor, and the rotation speed of the traveling driving motor is set to the auxiliary device driving motor. When the number of rotations exceeds 1, the power of the traveling drive motor is transmitted to the auxiliary drive motor by the one-way clutch, and the auxiliary drive motor is stopped to reduce the load.

[0004]

However, even if the above-mentioned driving device is applied while the vehicle is stopped, all the auxiliary machines driven by the auxiliary motor are used. For this reason, unnecessary auxiliary devices are driven when the vehicle is stopped, which not only consumes power wastefully, but also increases the size of the auxiliary device driving motor and increases the vehicle weight.

[0005] In the case of driving an auxiliary machine by a motor, in order to drive the auxiliary machine irrespective of the operating state of the engine, a motor is required for each auxiliary machine, and the auxiliary machine driving device becomes large in size and heavy. In addition, when an auxiliary machine other than the motor-driven auxiliary machine is driven by a power generation engine that supplies power to a vehicle driving motor, the power generation engine must be driven from an auxiliary machine drive request even if there is no operation request for the power generation engine. There is
The operation of the power generation engine when there is no request for the operation of the power generation engine results in inefficient power generation in which the amount of power generation or the like is suppressed depending on the state of the battery, and there is a problem that control with another engine stop request cannot be established.

For this reason, according to the present invention, even when the vehicle is at a standstill, only the auxiliary machine that is desired to be used is driven by the auxiliary machine driving motor so that the motor can be reduced in size and weight. It is intended to provide a device.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a vehicle travels by supplying power to a traveling motor, and while the vehicle is traveling, the vehicle is traveling by the traveling motor. The auxiliary machine of the first auxiliary machine group that needs to operate is driven. At this time, the auxiliary device driving motor is stopped, and the auxiliary devices of the second auxiliary group are inoperative. When the vehicle is in a stopped state, the accessory driving motor is driven to drive an auxiliary machine of a second auxiliary group that needs to be operated even when the vehicle is in a stopped state. As a result, even when the vehicle is stopped, only the accessory that is desired to be used is driven by the accessory drive motor, so that the drive motor can be reduced in size and weight.

According to the second aspect of the invention, when the detected value of the vehicle speed detecting means is equal to or less than a predetermined value, it is determined that the vehicle is in a stopped state, and the auxiliary device driving motor is operated prior to stopping the traveling motor. , Even while running and stopped
It is possible to prevent a decrease in the input to these devices for devices that require a certain amount of output from the auxiliary equipment, and maintain the device performance regardless of running or stopping.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred first embodiment of the present invention will now be described in detail with reference to the drawings. FIG.
FIG. 2 is a block diagram showing a schematic configuration of an electric vehicle to which the accessory drive device according to the present invention is applied, and FIG. 2 is a detailed view of the speed reducer of FIG.

As shown in FIGS. 1 and 2, an electric vehicle 1
Is composed of a traveling device 2, a first auxiliary group 3, a second auxiliary group 4, a power generator 5, a battery 6, a controller 7, and the like. The traveling device 2 includes, for example, two traveling motors 11,
The driving force of the traveling motors 11 and 12 is transmitted to rear wheels 16 and 16 as driving wheels via a gear 14 and a differential gear 15 of a speed reducer 13. The traveling motors 11 and 12 are connected to the battery 6 via an inverter 51 and a relay & fuse 50. The accessory drive device includes a first accessory group 3 and a second accessory group 4,
The speed reducer 13 (the traveling motor 1) that drives the first auxiliary machine group 3
1, 12) and an auxiliary device driving motor 28 for driving the second auxiliary device group 4.

The first auxiliary group 3 includes a 24V alternator 2
1. Air compressor 22, Air conditioner compressor 2
3. The power steering pump 24 and the like. The 24 V alternator 21 is a generator for charging a battery as a power source for lamps such as a headlamp and the like and a wiper device. Is a compressor of an air conditioner, and the power steering pump 24 is an oil pump for power steering. The 24 V alternator 21 and the air compressor 22 are driven by the drive gear 17 of the speed reducer 13, and the air conditioner compressor 23 and the power steering pump 24
Is driven by the drive gear 18 of the speed reducer 13. That is, each of the auxiliary machines 21 to 24 of the first auxiliary machine group 3 is an auxiliary machine that needs to be operated while the vehicle is running, and is driven by the speed reducer 13.

The second auxiliary machine group 4 includes an air compressor 2
6. It is constituted by a power steering pump 27 and is driven by an auxiliary machine driving motor 28. The air compressor 26 and the power steering pump 27 are auxiliary machines that need to operate even when the vehicle is stopped, and are driven by a dedicated motor 28. The air compressor 2 of the second auxiliary group
6. The power steering pump 27 is an auxiliary machine having the same function as the air compressor 22 and the power steering pump 24 of the first auxiliary machine group. Sufficient input is made to the power steering, air brake, and air suspension that need to operate as equipment even in the stopped state, even in the stopped state. That is, the auxiliary device driving device is an auxiliary device that needs to be operated even while the vehicle is stopped among the auxiliary devices of the first auxiliary device group that needs to be operated while the vehicle is running. Auxiliary equipment having the same function as the above is separately provided as a second auxiliary equipment group. By driving only the auxiliary machine that is desired to be used while the vehicle is stopped, the load on the motor 28 for driving the auxiliary machine can be reduced, and the size and weight can be reduced accordingly. The stopped state of the vehicle is detected based on a speed reducer rotation sensor 13a that detects the rotational speed of the speed reducer 13.

FIG. 3 shows the first auxiliary group 3 and the second auxiliary group 4
2 shows an example of a pneumatic circuit of two air compressors 22 and 26. The air sucked through the air cleaner 30 is:
The air is compressed by the air compressor 22 or 26 and supplied to the air tank via the check valves 31 and 32 and the unload valve 33. FIG. 4 shows an example of a hydraulic circuit of the two power steering pumps 24 and 27 of the first auxiliary group 3 and the second auxiliary group 4, and the hydraulic oil of the reservoir tank 35 is added by the power steering pump 24 or 27. The pressure is supplied to the power steering 37 via the flow control valve 36.

The power generator 5 includes a power generating engine 40 and a power generator 41 driven by the power generating engine 40 to charge the battery 6. The generator 40 and the accessory driving motor 28 are connected to the battery 6 via an inverter 52 and a relay & fuse 50. The controller 7 is a main controller, which receives a signal from a shift lever position sensor, a speed reducer rotation sensor, and an air pressure sensor (not shown) for detecting the air pressure in the air tank. 40 for controlling the traveling motor 1 via the inverter 51.
1 and 12 and the generator 40 via the inverter 52.
To control the charging of the battery 6 from the
8 and controls the charging of the battery 6 via the battery controller 54. In addition to the signals from the shift lever position sensor, the speed reducer rotation sensor 13a, the air pressure sensor, and the like, the control device 7 includes signals from various sensors and actuators of the brake control system, and various sensors of the signal control system. And various signals from an actuator (neither is shown).

The operation will be described below. In FIG. 1, the vehicle travels when electric power is supplied from the battery 6 to the traveling motors 11 and 12. The control device 7 includes a battery controller 54
The state of the battery 6 is detected based on the signal from the controller, and when charging is requested (power generation is requested), the engine controller 53 controls the power generation engine 40 to drive the generator 41,
The battery 6 is charged. Alternatively, during traveling, the battery 6 is charged while supplying power to the traveling motors 11 and 12.

While the vehicle is running, the 24 V alternator 21, air compressor 22, air conditioner compressor 23, power steering pump 24 of the first auxiliary group 3 are driven by the speed reducer 13.
An auxiliary machine that needs to be operated during traveling is driven. At this time, the auxiliary machine driving motor 28 is stopped, and the air compressor 26 and the power steering pump 27 of the second auxiliary machine group are in an inoperative state. When the vehicle is in a stopped state, the control device 7 drives the accessory driving motor 28 by supplying electric power from the battery 6 according to a signal from the air pressure sensor, the shift lever position sensor or the like, and the second accessory group 4 The air compressor 26 and the power steering pump 27 are operated. As a result, the air pressure and the hydraulic pressure for the power steering are ensured even when the vehicle is stopped. And the air compressor 2 of the first auxiliary machine group
2. By using the power steering pump 24, the air compressor 26 of the second auxiliary group, and the power steering pump 27 as auxiliary equipment having the same function, the same operation can be obtained during vehicle running and during vehicle stop.

The vehicle traveling time in the total operation time of the vehicle,
When the vehicle stop time and the operation time of the power generation engine 40 are compared, the vehicle travel time is maximum and the operation time of the power generation engine 40 is minimum, and the alternator 21, the air compressor 22, the air conditioner compressor 23, the power steering pump 24, etc. , The operating time of these accessories is maximized. Therefore, by driving the auxiliary device by the speed reducer 13 that is operating when the vehicle is running, the auxiliary device is driven when the vehicle is running, or the operation of the auxiliary device is directly related to the running as a speed reducer drive, A second auxiliary group is provided by separately providing an air compressor and a power steering pump which are not directly related to each other or which require a large amount of time for driving the auxiliary equipment, to form a second auxiliary machine group. The air compressor 26 and the power steering pump 27 of the second auxiliary machine group are provided. Is driven by a motor 28.

As a result, the frequency of operation of the auxiliary drive motor 28 is reduced to suppress the power consumption of the battery 6 and to avoid low power generation when there is no power generation request, thereby suppressing low efficiency power generation. Further, by setting the operation of the power generation engine irrespective of the driving of the auxiliary equipment, the degree of freedom of control of the power generation engine 40 is expanded. Next, the second flow chart shown in FIG.
The operation of the accessory group 4 will be described. This control repeats from start to return while the main switch of the hybrid electric vehicle (not shown) is turned on. The control device 7
It is determined whether or not the shift lever position is at the parking position (step S1). When it is not at the parking position, it is determined whether or not the rotation speed of the speed reducer 13 is equal to or lower than a predetermined value (step S2). The predetermined value is preferably a rotational speed at a vehicle speed of 4 to 5 km / h when the vehicle is substantially stopped. When the rotation speed of the speed reducer 13 is equal to or lower than a predetermined value, it is determined that the vehicle is in a stopped state, and the accessory drive motor 28 is driven (step S4), and the air compressor 26 and the power steering pump 27 are driven to be necessary. Secure air pressure and power steering pressure.

Thus, the motor operation is started before the vehicle is completely stopped, so that the air pressure of the air brake or the air suspension or the hydraulic pressure of the power steering does not excessively decrease. When it is determined in step S1 that the shift lever position is in the parking position, it is determined whether the air pressure in the air tank is lower than a predetermined pressure (step S3). Then, the air compressor 28 and the power steering pump 27 are driven to secure necessary air pressure and power steering oil pressure (step S4).
Thereby, the braking force is secured. When it is determined in step S2 that the rotation speed of the speed reducer 13 is not 0, it is determined whether the air pressure of the air tank is lower than a predetermined pressure (step S3). The driving motor 28 is driven (step S
4) The air compressor 26 and the power steering pump 27 are driven to secure necessary air pressure and hydraulic pressure of the power steering. As a result, it is possible to secure a steering operation force and a braking force in a garage putting operation or the like. If it is determined in step S3 that the air pressure has not dropped, the auxiliary device driving motor 28 is kept stopped (step S5). As described above, when there is an operation request when the vehicle is stopped, the auxiliary equipment such as the air compressor 26 and the power steering pump 27 is driven by the auxiliary equipment driving motor 28.

In this embodiment, in order to overlap the driving force of the traveling motors 11 and 12 transmitted through the speed reducer 13 with the driving force of the auxiliary device driving motor 28, the stop determination is made at an extremely low vehicle speed. However, the present invention is not limited to this, and even when the vehicle speed is set to zero, the effect of driving the second auxiliary machine group in the stopped state is exhibited. On the other hand, when the vehicle starts moving, the shift lever position other than P (step S
1) Until the speed of the speed reducer becomes larger than a predetermined value (step S2), the motor drive by the accessory drive motor 28 is performed, and the first accessory group is driven by the drive motors 11 and 12 to some extent. The operation of the power steering, air brake, air suspension, air conditioner, etc. is favorably performed by both motors.

Next, a second embodiment of the present invention will be described. FIG. 6 shows a configuration in which the air compressor 26 in FIG. 3 is shared by the first auxiliary equipment group and the second auxiliary equipment group,
The same reference numerals are given to the components already described in the first embodiment, and description thereof will be omitted. To the air compressor 26, power from the accessory driving motor 28 and the reduction gear 13 driven by the traveling motors 11 and 12 is transmitted by the gear 53, and the clutch 51 is engaged while the vehicle is traveling, and the clutch 5
When the vehicle is stopped, the clutch 51 is disconnected and the clutch 52 is engaged.

The unillustrated actuators of the clutches 51 and 52 are controlled by a signal from the control device 7, and the switching of the clutches 51 and 52 has a contact state so that a non-transmission state of power can be avoided. According to the second embodiment of the present invention, since the first and second groups of auxiliary machines can be used,
This saves space for arranging auxiliary equipment.

[0023]

According to the first aspect of the present invention, when the vehicle is stopped, the necessary auxiliary equipment is driven by the dedicated auxiliary drive motor so that the necessary auxiliary equipment can be driven even when the vehicle is stopped. It can be driven, and the accessory drive motor operates only in the stopped state, so that the output of the motor can be reduced,
A reduction in size, weight, and cost can be achieved.

According to the second aspect of the present invention, the driving of the auxiliary equipment by the driving motor and the driving of the auxiliary equipment by the auxiliary driving motor are overlapped, so that the input to the equipment requiring the output of the auxiliary equipment is reduced. , And sufficient equipment capability can be generated regardless of the difference between the running and the stopped state.

[Brief description of the drawings]

FIG. 1 is a schematic configuration block diagram of a first embodiment of an electric vehicle to which an accessory drive device according to the present invention is applied.

FIG. 2 is a configuration diagram of a first auxiliary machine group driven by the speed reducer of FIG. 1;

FIG. 3 is a pneumatic circuit diagram of two auxiliary machines (air compressors) of a first and second auxiliary machine group in the auxiliary machine driving device of the present invention.

FIG. 4 is a hydraulic circuit diagram of two auxiliary machines (power steering pumps) of a first and second auxiliary machine group in the auxiliary machine driving device of the present invention.

FIG. 5 is a flowchart showing the operation of the accessory drive device of FIG. 1;

FIG. 6 is a configuration diagram showing a second embodiment of the drive mechanism of the first and second accessory groups in the accessory drive device of the present invention.

[Description of Signs] 1 Electric vehicle 2 Traveling device 3 First accessory group 4 Second accessory group 5 Power generation device 6 Battery 7 Control device 11, 12 Traveling motor (drive motor) 13 Reduction gear

Claims (2)

[Claims] 1. A traveling motor for generating power to driving wheels, a first group of auxiliary machines driven by the power of the traveling motor and required to operate while the vehicle is traveling, A second auxiliary group that needs to be operated even when the vehicle is in a stopped state, and an auxiliary equipment driving unit that drives only the second auxiliary group when the vehicle is in a stopped state; An auxiliary device driving device for an electric vehicle, comprising: a motor; 2. The vehicle according to claim 1, further comprising a vehicle speed detecting means, wherein when the detected value of the vehicle speed detecting means is equal to or less than a predetermined value, the vehicle is in a stopped state and the stopped state is detected. And a control means for operating the accessory drive motor prior to stopping the traveling motor. An accessory drive device for an electric vehicle, comprising: