Control apparatus and control method for vehicle electric oil pump
AssigneeHitachi Automotive Systems, Ltd.
InventorsMasahiko Wakairo, Naoki Okamoto
Life of this patent
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Abstract
A control apparatus and a control method that controls an electric oil pump that supplies oil to a power transmission device transmitting a drive force to an axle. The control apparatus changes a PWM frequency in a PWM control of the electric oil pump to a lower frequency, when a vehicle is in a pulled state, when a vehicle speed is high, when a power source is operated at a high rotational speed, when a discharge amount from the electric oil pump is large, or when a noise in a vehicle interior is large. Thus, a drive noise of the pump can be reduced, or the amount of heat generated in the pump drive circuit and power consumption can be reduced.
Claims16
A control apparatus that controls an electric oil pump of a vehicle that supplies oil to a power transmission device transmitting a drive force to an axle, the control apparatus comprising:
- a frequency setting unit that changes a PWM frequency of a motor of the electric oil pump depending on at least one of a state of a noise in an interior of the vehicle, whether the vehicle is in a pulled state or in a self-propelled state, and an oil discharge amount of the electric oil pump.
A control apparatus that controls an electric oil pump of a vehicle that supplies oil to a power transmission device transmitting a drive force to an axle, the control apparatus comprising:
- frequency setting means that changes a PWM frequency of a motor of the electric oil pump depending on at least one of a state of a noise in an interior of the vehicle, whether the vehicle is in a pulled state or in a self-propelled state, and an oil discharge amount of the electric oil pump.
A control method of controlling an electric oil pump of a vehicle that supplies oil to a power transmission device transmitting a drive force to an axle, the control method comprising the steps of:
- determining at least one of a state of a noise in an interior of the vehicle, whether the vehicle is in a pulled state or in a self-propelled state, and an oil discharge amount of the electric oil pump, as a state of the vehicle;
- and
- changing a PWM frequency of a motor of the electric oil pump according to the state of the vehicle.
Dependencies are inferred from the claim text.