Transmission control system with load compensated shift modulati

Details Transmission control system with load compensated shift modulati Transmission control system with load compensated shift modulati

1991-12-02

1993-05-25

Braun, Leslie A.

Machine element or mechanism

Gearing

Interchangeably locked

3644241, B60K 4106

Patent

active

052129985

ABSTRACT:
A vehicle has a powershift transmission driven by an engine via a torque converter. The transmission is shifted by pressure operated clutches which are controlled by electrohydraulic pressure control valves. A speed ratio value representing a ratio of the torque converter output shaft speed to the torque converter input shaft speed is determined. A minimum clutch pressure value and a slope value are determined as a function of the speed ratio value. During a shifting of the transmission, a pulse-width-modulated signal applied to the valve is controlled so that the pressure applied to the clutch will vary from the minimum clutch pressure to a maximum clutch pressure at a rate proportional to the slope value.

REFERENCES:
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4485443 (1984-11-01), Knodler et al.
patent: 4676348 (1987-06-01), Coutant
patent: 4835694 (1989-05-01), Yamamoto et al.
patent: 4836057 (1989-06-01), Asayama et al.
patent: 4843902 (1989-07-01), Patton et al.
patent: 4855913 (1989-08-01), Brekkestran et al.
patent: 4967385 (1990-10-01), Brekkestran et al.
patent: 4977797 (1990-12-01), Aoki et al.
SAE Technical Paper Series 861212 "The Design and Development of a Four Speed Powershift Transmission with Electronic Clutch Pressure Modulation", Sep. 8, 1986.

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