Control system for changing servo timings of hydraulic pressure

Details Control system for changing servo timings of hydraulic pressure Control system for changing servo timings of hydraulic pressure

1992-11-27

1995-04-04

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477131, 477132, 477143, F16H 6104, F16H 6108

Patent

active

054032482

ABSTRACT:
A control system is provided for servo hydraulic pressure in an automatic transmission having planetary gear mechanisms. First and second frictional engagement devices, whose servo pressures are reversed in feed/drain relationship between desired two high speed stages, are controlled by a shift valve and a directional control valve. The shift valve is switched by a first solenoid. The directional control valve is interposed in a servo hydraulic pressure feed/drain line communicating the shift valve with the first frictional engagement device and is controlled by a second solenoid. The first and second solenoids are controlled by an electronic control unit in accordance with a shift position detected by a detector, whereby the timings of feed or drain of the servo hydraulic pressures to or from the first and second frictional engagement devices are changed by predetermined relative amounts, respectively.

REFERENCES:
patent: 4727773 (1988-03-01), Sumiya et al.
patent: 4770064 (1988-09-01), Kuerschner
patent: 4854195 (1989-08-01), Moroto et al.
patent: 4922424 (1990-05-01), Hiramatsu
patent: 4953090 (1990-08-01), Narita
patent: 5038638 (1991-08-01), Hayakawa et al.
patent: 5119695 (1992-06-01), Milunas et al.
patent: 5119697 (1992-06-01), Vukovich et al.
patent: 5184528 (1993-02-01), Mochizuki

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