Oil supply device and method of controlling electric oil pump
a technology of oil supply device and electric oil pump, which is applied in the direction of pump control, pump components, rotary piston liquid engine, etc., can solve the problems of excessively low pressure applied to unlikely to take oil, and significant negative pressure generated on the intake side of the pump chamber compared to atmospheric pressure, etc., to achieve smooth application
Inactive Publication Date: 2018-05-17
MIKUNI CORP
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Benefits of technology
The oil supply device and method of controlling an electric oil pump prevent negative pressure and air from entering the pump chamber when the electric oil pump is shut down. This allows for smooth application of oil after startup.
Problems solved by technology
Accordingly, since the oil is unlikely to be taken in smoothly when the engine is started, significant negative pressure is generated on the intake side of the pump chamber compared to when being at an ordinary temperature.
If the engine is shut down in a state in which such negative pressure is applied, excessively low pressure is applied to the intake side of the pump chamber compared to atmospheric pressure.
Method used
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[0025]Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0026]FIG. 1 is a block diagram of an oil supply device 10 of the present invention. In addition, FIG. 2 illustrates a simplified diagram of an electric oil pump showing the internal structure. The oil supply device 10 of the present invention causes cooling oil 40 to circulate, thereby cooling a cooling subject device 17 such as an electric motor and a generator. The oil supply device 10 includes a rotary volumetric change pump 20 and an electric oil pump 11 provided with a motor 12 which operates the rotary volumetric change pump 20.
[0027]Similar to rotary volumetric change pumps in the related art, the rotary volumetric change pump 20 has a structure in which an inner rotor 21 serves as an external gear, an outer rotor 22 serves as an internal gear, and each of the rotors has a tooth form formed based on a trochoid curve. A circumscribed portion of the outer rot...
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The objective of the present invention provides an oil supply device in which a negative pressure in a pump chamber is reduced or eliminated when an electric oil pump is shut down, thereby preventing air from entering the pump chamber and allowing oil to be supplied or recirculated smoothly. This oil supply device includes: an electric oil pump in which a rotary volumetric change pump provided with an inner rotor and an outer rotor is caused to operate by means of a motor; and an electric oil pump controller which controls the motor in such a way that, when the electric oil pump is to be shut down, the rotary volumetric change pump is caused to temporarily stop, after which the rotary volumetric change pump is caused to rotate by a predetermined angle in the opposite direction to the direction of rotation during oil supply, and is then shut down.
Description
TECHNICAL FIELD[0001]The present invention relates to an oil supply device in which negative pressure generated inside a pump chamber is reduced or eliminated when an electric oil pump is to be shut down, and a method of controlling an electric oil pump.BACKGROUND ART[0002]Oil supply devices used for cooling a motor of a hybrid car, a generator, and the like employ an electric oil pump. Rotary volumetric change pumps are widely used as the electric oil pump (for example, refer to Patent Literature 1).[0003]The operation of a rotary volumetric change pump is disclosed in Patent Literature 2, and the operation will be described simply using the drawings. FIG. 4 is an operation diagram for describing an operation of the rotary volumetric change pump in which a rotor rotates, in the order of (a), (b), (c), (d), and (e). Here, the drawings illustrate an example of steps of intaking, compressing, and discharging oil 40 performed in one pump chamber. Regions filled with the oil are indicat...
Claims
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IPC IPC(8): F04C14/06F04C2/10
CPCF04C14/06F04C2/102F04C13/002F04C14/04F04C2210/206F04C2240/20F04C2240/40F04B49/02
Inventor YASHIMA, KANDOI, TAKASHI
Owner MIKUNI CORP