Hydraulic control device
AssigneeHonda Motor Co., Ltd.
InventorsMasamichi Harada, Makito Nakasone
Life of this patent
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Abstract
In a hydraulic control device, a state determination unit of a control unit determines whether a second pump is in a boosting operation or in a transition state. If the state determination unit has determined that the second pump is in the boosting operation or in the transition state, a valve-opening detection unit determines whether a check valve is opened. If the valve-opening detection unit has determined that the check valve is opened, a controller stops the second pump or decreases the rotation number of the second pump.
Claims6
A hydraulic control device including, between a first pump and a hydraulic operation unit of a transmission, a second pump and a check valve connected in parallel, wherein first oil supplied from the first pump is supplied to the hydraulic operation unit either through the check valve or through the second pump, wherein the first oil from the first pump is supplied to the hydraulic operation unit through the check valve as the first oil, or the first oil from the first pump is pressurized by the second pump into second oil that is supplied to the hydraulic operation unit as the second oil, the hydraulic control device comprising:
- a valve-opening detection unit configured to detect that the check valve is opened while the second pump is driven;
- and
- a pump controller configured to stop the second pump or decrease a rotation speed of the second pump, based on the valve-opening detection unit detecting that the check valve is opened.
Dependencies are inferred from the claim text.