Gearshift controller for automatic transmission

Details Gearshift controller for automatic transmission Gearshift controller for automatic transmission

1995-06-06

1997-01-21

Teska, Kevin J.

Boots, shoes, and leggings

477144, 477148, 477158, B60K 4122, F16H 6106

Patent

active

055964958

ABSTRACT:
A system for controlling a downshift in an automatic transmission having a torque converter includes friction elements for alternately producing a drive connection between components of a planetary gear set and disengaging the connection, a valve body adapted to connect a source of high pressure hydraulic fluid to the friction elements, a solenoid for controlling operation of the hydraulic valves, a microprocessor having a memory containing control algorithms, sensors producing signals representing the speed of the transmission output shaft and turbine shaft, a sensor producing a signal representing the position of an engine throttle, the control algorithms controlling a downshift of the transmission.

REFERENCES:
patent: 4527678 (1985-07-01), Pierce et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4955259 (1990-09-01), Narita
patent: 4970916 (1990-11-01), Narita
patent: 5046178 (1991-09-01), Hibner et al.
patent: 5081887 (1992-01-01), Kato
patent: 5134904 (1992-08-01), Minagawa

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