JP2000073958A - Starting control device for electric pump of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the build up characteristic of a pump by controlling the electric pump at the time of starting thereof so as to be driven at the predetermined high rotation during a constant time or till the pressure of a pressure-oil line becomes the predetermined pressure. SOLUTION: Signal from a vehicle controller 21 is input to a control device 20 for controlling an electric vane pump 10. At this stage, when the signal for starting the electric pump is input to the control device 20 from the vehicle controller 21, the controller 20 operates a control system so as to control the drive of the electric vane pump 10 on the basis of the signal from an oil temperature sensor 22 for detecting the oil temperature of the electric vane pump 10 at a suction side and a pressure sensor 25 for detecting the pressure of a pressure-oil line 24 for connecting the electric vane pump 10 and a hydraulic device 23 of a transmission to each other. Since the electric vane pump 10 is thereby driven at a high speed at the time of starting, vanes of the electric vane pump 10 is made to slide for contact with a cam ring by the centrifugal force, and the quick build up characteristic of the pump 10 can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting control device for an electric pump for a vehicle.

[0002]

2. Description of the Related Art Automatic transmissions and continuously variable transmissions are known as transmissions for vehicles, and these transmissions change the speed by hydraulic pressure.

[0003] An oil pump for supplying hydraulic pressure to a hydraulic mechanism such as a transmission is directly driven by the engine, but when the engine speed is high, the discharge oil amount does not become excessive. We are considering using an electric vane pump that can suppress drive loss (Mechanical Engineering Handbook B5, Fluid Machinery ... Japan Society of Mechanical Engineers 1
Published September 30, 989, Japanese Patent Application No. 9-234605, etc.).

[0004]

However, in such an electric vane pump, when stopped, the pressure (discharge pressure) applied to the bottom of the vane disappears, so that the vane at the upward position is not covered by the groove of the rotor. I will be depressed inside.
Therefore, when starting the pump, it takes some time for the vane to protrude to the cam ring due to centrifugal force,
The characteristics are as shown in FIG.

Therefore, when used in a transmission, there is an inconvenience that the shift cannot be performed with good responsiveness due to the shortage of the pump discharge oil amount and the pressure of the hydraulic line.

SUMMARY OF THE INVENTION An object of the present invention is to improve the rising characteristics of a pump to solve such a problem.

[0007]

According to a first aspect of the present invention, there is provided an electric pump for a vehicle for supplying a hydraulic pressure to a hydraulic mechanism such as a transmission. A control means is provided for controlling the motor to drive at a predetermined high rotation until the pressure is reduced.

[0008] In a second aspect based on the first aspect, the control means drives the electric pump at a high speed when the start of the electric pump is OK on the system.

In a third aspect based on the first aspect, the control means sets the number of revolutions of the electric pump according to the oil temperature.

[0010]

According to the first and second aspects of the present invention, the start-up characteristics of the electric pump at the time of starting the electric pump are improved, and the shifting performance and reliability of the transmission and the like can be improved.

According to the third aspect of the present invention, it is possible to secure a quick start-up characteristic of the electric pump without increasing the driving power of the electric pump based on the oil temperature.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a control block diagram in the case where an electric vane pump 10 is used as a hydraulic pump for a transmission of a vehicle.
Shows a cross section of the electric vane pump 10.

The electric vane pump 10 includes an electric motor 11
When the rotor 12 is rotated, the vane 13 fitted in the groove of the rotor 12 slides on the inner periphery of the elliptical cam ring 14, and the vane 13, the cam ring 14, and an oil chamber 15 surrounded by a side plate (not shown) are formed. The oil is discharged from a discharge port (not shown) by expanding and contracting.

A control device 20 for controlling the electric vane pump 10 receives a signal from a vehicle controller 21. Further, an oil temperature sensor 22 for detecting an oil temperature on the suction side or the like of the electric vane pump 10 and a pressure sensor 25 for detecting a pressure of a hydraulic line 24 connecting the electric vane pump 10 and a hydraulic mechanism 23 of the transmission are provided. These signals are also input to the control device 20.

Then, when a signal of starting the electric pump is input from the vehicle controller 21, the control device 20
The control system is operated to control the driving of the electric vane pump 10 based on signals from the oil temperature sensor 22 and the pressure sensor 25.

Next, the contents of control by the control device 20 are shown in FIG.
A description will be given based on the flowchart of FIG.

First, in steps S1 and S2, the electric pump starts OK and N based on a signal from the vehicle controller 21.
G is determined.

In step S3, the electric vane pump 10
Is determined to be a predetermined high rotation speed N. In this case, the rotation speed of the pump 10 is determined according to the oil temperature.

In step S4, the electric vane pump 10
Is started, and the driving power thereof is controlled so as to drive the electric vane pump 10 at the determined high rotation speed N.

When the pressure P of the hydraulic line 24 on the discharge side of the electric vane pump 10 reaches the set line pressure in step S5, the process proceeds to step S6, where the rotational speed of the electric vane pump 10 is returned to the normal rotational speed. Then, shift to the normal pump control.

The control device 20 determines the throttle opening,
A valve or the like of the hydraulic mechanism 23 is controlled based on an operating state such as a vehicle speed to shift the gear to the target gear ratio.

As described above, when the electric vane pump 10 is started, the electric vane pump 10 is driven to rotate at a high speed, so that the vanes 13 of the electric vane pump 10 are brought into sliding contact with the cam ring 14 by centrifugal force, as shown in FIG.
Can be secured quickly.

Therefore, the shift control of the transmission can be started immediately after the key switch 21 of the engine is turned on, so that the shift performance is improved and the reliability of the transmission is improved.

When the electric vane pump 10 is started,
The electric vane pump 10 may be driven at a high rotation for a certain period of time. Further, in the embodiment, an example in which the present invention is applied to a hydraulic pump of a transmission is shown. However, it is needless to say that the present invention can be applied to another hydraulic mechanism or a pump for supplying oil.

[Brief description of the drawings]

FIG. 1 is a control block diagram.

FIG. 2 is a sectional view of the electric vane pump.

FIG. 3 is a flowchart showing control contents.

FIG. 4 is a graph showing a rising characteristic of a pump.

FIG. 5 is a rise characteristic diagram of a conventional pump.

[Explanation of symbols]

 Reference Signs List 10 electric vane pump 11 electric motor 13 vane 20 control device 21 vehicle controller 22 oil temperature sensor 23 hydraulic mechanism 24 hydraulic line 25 pressure sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Teruhiko Mochizuki 1370 Onna, Atsugi-shi, Kanagawa Prefecture F-term in UNISI AJEX Co., Ltd. BA03 CA03 CA19 CA21 CA29 DA05 EA34

Claims (3)

[Claims] 1. An electric pump for a vehicle that supplies oil pressure to a hydraulic mechanism such as a transmission, wherein the electric pump is driven at a predetermined high rotation for a predetermined time or until the pressure of a hydraulic line reaches a predetermined pressure when the electric pump is started. A starting control device for an electric pump for a vehicle, comprising a control means for controlling the starting of the electric pump. 2. The start control apparatus for an electric pump for a vehicle according to claim 1, wherein the control means drives the electric pump at a high speed when the start of the electric pump is OK on the system. 3. The start-up control device for an electric pump for a vehicle according to claim 1, wherein the control means sets the number of revolutions of the electric pump according to an oil temperature.