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US 7,018,315 B2Granted
Hydraulic control apparatus for vehicle and method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroatsu Endo, Shinichi Kojima, Tatsuya Ozeki
Life of this patent
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Abstract
A hydraulic control apparatus for a vehicle including an electric oil pump, a pump control portion which controls the electric oil pump, a hydraulic circuit portion which supplies a hydraulic pressure from the electric oil pump to an actuator of a transaxle of the vehicle, a hydraulic circuit control portion which outputs a control signal to the hydraulic circuit portion, and an oil pump rotation control portion which is provided in the pump control portion and which controls a rotational state of the electric oil pump according to a change in a control status of the hydraulic circuit control portion.
Claims16
A hydraulic control apparatus for a vehicle, comprising:
- an electric oil pump;
- a pump control portion which controls the electric oil pump;
- a hydraulic circuit portion which supplies a hydraulic pressure from the electric oil pump to an actuator of a transaxle of the vehicle;
- a hydraulic circuit control portion which outputs a control signal to the hydraulic circuit portion;
- an oil pump rotation control portion which is provided in the pump control portion and which controls a rotational state of the electric oil pump according to a change in a control status of the hydraulic circuit control portions;
- an operation state determining portion which determines an operation state of the vehicle;
- and
- a hydraulic pressure determining portion which determines whether a hydraulic pressure in the hydraulic circuit portion of the vehicle needs to be in a low hydraulic pressure region or in a high hydraulic pressure region based on a result of determination made by the operation state determining portion, wherein the hydraulic circuit control portion computes the control signal based on the result of determination made by the operation state determining portion, and the oil pump rotation control portion controls a rotational speed of the electric oil pump based on a result of determination made by the hydraulic pressure determining portion.
5 more elements
A hydraulic control apparatus for a vehicle, comprising:
- an electric oil pump;
- a control portion for the electric oil pump;
- a hydraulic circuit portion which supplies a hydraulic pressure from the electric oil pump to an actuator of a transaxle of the vehicle;
- a hydraulic circuit control portion which outputs a control signal to the hydraulic circuit portion;
- an operation state determining portion which determines an operation state of the vehicle,
- a hydraulic pressure determining portion which determines whether a hydraulic pressure in the hydraulic circuit portion of the vehicle needs to be in a low hydraulic pressure region or in a high hydraulic pressure region based on a result of determination made by the operation state determining portion;
- an oil pump rotation control portion which controls a rotational state of the electric oil pump based on a result of determination made by the hydraulic pressure determining portion;
- a rotation return portion which sets the rotational speed of the electric oil pump to be in a low rotational speed region when it is determined as a result of determination made by the hydraulic pressure determining portion that the hydraulic pressure of the hydraulic circuit portion needs to be in the low hydraulic pressure region, and sets the rotational speed of the electric oil pump to be in a higher rotational speed region than the low rotational speed region when it is determined as a result of determination made by the hydraulic pressure determining portion that the hydraulic pressure of the hydraulic circuit portion needs to be in the high hydraulic pressure region, and which returns the rotational speed of the electric oil pump from the low rotational speed region to the high rotational speed region, wherein the rotation return portion sets a rate of change of the rotational speed of the electric oil pump when the rotational speed returns from the low rotational speed region to the high rotational speed region to be larger than a rate of change of the rotational speed of the electric oil pump when the electric oil pump is in the high rotational speed region.
5 more elements
A control method of a hydraulic control apparatus for a vehicle, which comprises an electric oil pump;
- a pump control portion which controls the electric oil pump;
- a hydraulic circuit portion which supplies a hydraulic pressure from the electric oil pump to an actuator of a transaxle of the vehicle;
- and a hydraulic circuit control portion which outputs a control signal to the hydraulic circuit portion;
- comprising the step of:
- controlling a rotational state of the electric oil pump with an oil pump rotation control portion provided in the pump control portion according to a change in a control status of the hydraulic circuit control portion;
- determining an operation state of the vehicle with an operation state determining portion, and
- determining with a hydraulic pressure determining portion whether a hydraulic pressure in the hydraulic circuit portion of the vehicle needs to be in a low hydraulic pressure region or in a high hydraulic pressure region based on a result of determination made by the operation state determining portion, wherein the hydraulic circuit control portion computes the control signal based on the result of determination made by the operation state determining portion, and the oil pump rotation control portion controls a rotational speed of the electric oil pump based on a result of determination made by the hydraulic pressure determining portion.
4 more elements
Dependencies are inferred from the claim text.