Hydraulic control system for a motor vehicle automatic transmiss

Details Hydraulic control system for a motor vehicle automatic transmiss Hydraulic control system for a motor vehicle automatic transmiss

1985-06-03

1987-08-25

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, 74870, B60K 4104

Patent

active

046884521

ABSTRACT:
A vehicle automatic transmission including a torque converter, a multiple stage transmission gear mechanism connected with the torque converter and a hydraulic control circuit for automatically selecting one of gear stages of the transmission gear mechanism. The hydraulic control circuit includes a kick-down control device which functions to shift down the gear mechanism when the engine control foot pedal is substantially fully depressed. Depending on the vehicle running condition, the kick-down control device may shift down the gear mechanism by two gear stages. The hydraulic circuit includes control hydraulic circuit which functions to shift down the gear mechanism at first by one gear stage and then by a further one stage. For the purpose, relay valves are provided in kick-down control lines to lower stage shift valves.

REFERENCES:
patent: 3774629 (1973-11-01), Enomoto
patent: 3785224 (1974-01-01), Will
patent: 3895542 (1975-07-01), Miyauchi
patent: 4142613 (1979-03-01), Iijima
patent: 4369676 (1983-01-01), Gaus
patent: 4417307 (1983-11-01), Kubo et al.
patent: 4467675 (1984-08-01), Sugano et al.

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