Apparatus for controlling an automatic transmission

Details Apparatus for controlling an automatic transmission Apparatus for controlling an automatic transmission

1979-09-28

1981-09-22

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4110

Patent

active

042903246

ABSTRACT:
A device controlling a multi-stage automatic transmission for an engine-driven vehicle with three forward drive ratios and change-under torque, damped by a hydrokinetic torque converter, and one reverse drive, of the type consisting of an epicyclic gear train actuated by two clutches and two brakes hydraulically controlled. A hydraulic distribution unit is monitored by two electric valves in order to feed selectively the two clutches and the two brakes on the basis of data concerning the running of the vehicle. The two electric valves are controlled in response to three different states of the two electric valves for providing selective feeds corresponding respectively to each of the three forward drive ratios and for providing an additional control of the electric valves in response to a fourth transient state for the transmission between the third and second forward drive ratios.

REFERENCES:
patent: 3738199 (1973-06-01), Rubo et al.
patent: 3741042 (1973-06-01), Ravenel
patent: 3776048 (1973-12-01), Enomoto et al.
patent: 3813964 (1974-06-01), Ichimura et al.
patent: 3868869 (1975-03-01), Hunt et al.
patent: 3937108 (1976-02-01), Will
patent: 3938409 (1976-02-01), Uozumi
patent: 4030381 (1977-06-01), Lalin et al.
patent: 4034627 (1977-07-01), Mizote
patent: 4041809 (1977-08-01), Dick et al.
patent: 4073204 (1978-02-01), Dick

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