Hyundai Motor Company

Kia Motors Corporation

Aisin Aw Co., Ltd.

Kiyotaka Wakamatsu

Hyun Ku Lee

Ryogo Kato

Yoshio Koike

Yoshizou Akita

A hydraulic control system includes a key detector that detects whether an ignition key is in an on state, a control portion that outputs different control signals according to whether the engine is on if the key is on, and a valve, such as a solenoid valve, that controls gear shifts according to the control signals from the control portion. A hydraulic control method includes determining whether an ignition key is on; determining whether an engine is on or off if the key is on; and controlling a valve, such as a solenoid valve, that controls gear shifts, differently depending on whether the engine is on or off, such as by applying different duty values to the valve. A low duty value may be applied to the valve when the engine is off, and a higher duty value may be applied to the valve when the engine is on.

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Anjo, Japan

Kiyotaka Wakamatsu