Hydraulic pressure control apparatus for automatic transmission of vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroatsu Endo, Masatoshi Ito, Tatsuya Ozeki
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Abstract
A hydraulic pressure control apparatus for controlling an automatic transmission of an automotive vehicle, with a pressurized working fluid delivered from a hydraulic pump driven by an electric motor, wherein a pump control device is operated upon starting of the electric motor to start the hydraulic pump, for controlling the electric motor, such that a rate of increase of the operating speed of the hydraulic pump decreases with a decrease in the temperature of the working fluid detected by a temperature detector.
Claims11
A hydraulic pressure control apparatus for controlling an automatic transmission of an automotive vehicle, with a pressurized working fluid delivered from a hydraulic pump driven by an electric motor, comprising:
- temperature detecting device for detecting a temperature of the working fluid;
- and
- pump control means operable upon starting of said electric motor to start said hydraulic pump, for controlling said electric motor, such that a rate of increase of an operating speed of said hydraulic pump decreases with a decrease in the temperature of the working fluid detected by said temperature detecting device.
Dependencies are inferred from the claim text.