Control system having an improved responsiveness to a third-to-f

Details Control system having an improved responsiveness to a third-to-f Control system having an improved responsiveness to a third-to-f

1996-12-17

1999-01-26

Lorence, Richard M.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477136, F16H 6102

Patent

active

058632760

ABSTRACT:
A control system having an improved responsiveness to a third-to-first speed skip shift by controlling a hydraulic pressure for disengaging a front clutch. The system employs a sensor for sensing the revolution per minute of an engine wherein an electrical signal is variable according to the rotational speed of the engine, a sensor for sensing the revolution per minute of an output shaft wherein an electrical signal is variable according to the rotational speed of the output shaft, and a sensor for sensing the opening of a throttle valve wherein the opening of the throttle valve is variable according to the operation of an accelerator pedal and for outputting a corresponding electrical signal. A transmission control unit determines the state of the automatic transmission by reading the output signals from sensors and setting the duty ratio for controlling the operation of a hydraulic pressure control solenoid valve for controlling an operation of friction members thereby allowing the automatic transmission to be gradually shifted from third-to-second-to-first speed if it determined that the transmission is in a third-to-first speed shift.

REFERENCES:
patent: 3653281 (1972-04-01), Shirai et al.
patent: 4833947 (1989-05-01), Izumi et al.
patent: 4905545 (1990-03-01), Leising et al.
patent: 5168777 (1992-12-01), Isono et al.
patent: 5462500 (1995-10-01), Benford et al.
patent: 5624351 (1997-04-01), Fujita et al.

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