Line pressure controller for automatic transmission and method thereof

DETAILED DESCRIPTION The preferred embodiment of the present invention includes hydraulic pressure controller (including device) for an automatic transmission, and an oil (or hydraulic) control method thereof, which provides a smooth kick-down from any accelerator pedal position in order to attenuate shift shock.
The oil (or hydraulic) controller of the preferred embodiment comprises a throttle opening degree sensor, a vehicle speed sensor to detect a vehicle speed, a hydraulic pressure controller (or means) to which an output signal from each sensor is input, and a line pressure solenoid to which an output signal from the hydraulic controller (or means) is input.
The hydraulic pressure controller further comprises a storage means (including device) for storing the output signal from the throttle opening degree sensor and a line pressure control means (including device) for controlling the line pressure during a gear shift according to the throttle opening degree during a predetermined period of time before the gear shift is determined.
The hydraulic pressure controller of the preferred embodiment, therefore, stores information regarding the throttle opening degree for the predetermined period of time before the gear shift is determined and controls the line pressure during the gear shift according to the throttle opening degree so that a smooth clutch engagement can be established and that the shift shock is attenuated for any throttle opening degree just before the gear shift determination.