Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1996-12-30
1999-02-23
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477156, 477160, 477161, F16H 6100, B60K 4108
Patent
active
058738037
ABSTRACT:
The method of controlling a pressure control solenoid valve which controls hydraulic pressure in a hydraulic control system for an automatic transmission of a vehicle first senses a plurality of vehicle operating conditions, and detects a power-on vehicle operating state based on the sensed vehicle operating conditions. Next, the method controls a duty ratio of the pressure control solenoid valve according to predetermined values corresponding to the power-on state when the power-on state detected. The method then detects a change in the vehicle operating state from the power-on state to a power-off state. Upon detection, the method generates an initial duty ratio for the pressure control solenoid valve based on a predetermined duty ratio corresponding to the power-off state and duty ratios supplied to the pressure control solenoid valve during the power-on state. The pressure control solenoid valve is then controlled according to this initial duty ratio during the power-off state.
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patent: 4955259 (1990-09-01), Narita
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patent: 5303614 (1994-04-01), Sasaki et al.
patent: 5540635 (1996-07-01), Jang
patent: 5573476 (1996-11-01), Minowa et al.
Hyundai Motor Co. Ltd.
Ta Khoi Q.
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