Control system for vehicular automatic transmissions with a quic

Details Control system for vehicular automatic transmissions with a quic Control system for vehicular automatic transmissions with a quic

1994-04-15

1996-03-26

Khoi, Q. Ta

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477131, 477138, 477118, 475123, F16H 6124, B60K 4106

Patent

active

055016456

ABSTRACT:
A vehicular automatic transmission and control system therefor includes an automatic transmission including a planetary gear unit and a plurality of friction elements for connecting the components of the planetary gear unit selectively to rotary members or stationary members; a hydraulic control unit for selectively switching and controlling oil pressures to be fed to the friction elements; and an electronic control unit for outputting a signal indicating the running state of a vehicle to control the feed of the oil pressures to the friction elements. The hydraulic control unit includes first and second hydraulic servos for establishing a first gear stage by connecting either the rotary members to each other or the rotary members and the stationary members; a third hydraulic servo for establishing a second gear stage; shift switch system for switching and controlling the feed of oil pressure to either the first or third hydraulic servo in accordance with the vehicle running state; and switch system for controlling the feed of the oil pressure to one of the first and second hydraulic servos in accordance with the signal of the electronic control unit indicating the vehicle running state.

REFERENCES:
patent: 4817472 (1989-04-01), Kubo et al.
patent: 4947330 (1990-08-01), Hiramatsu
patent: 4991464 (1991-02-01), Ishikawa et al.
patent: 5033331 (1991-07-01), Takada et al.
patent: 5115696 (1992-05-01), Takada et al.

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