System for controlling an independent rearclutch during skip shi

Details System for controlling an independent rearclutch during skip shi System for controlling an independent rearclutch during skip shi

1995-05-25

1997-10-07

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 477906, F16H 6126, F16H 6104

Patent

active

056741529

ABSTRACT:
A system for controlling an automatic transmission, mounted on a vehicle and connected to an engine, includes a plurality of sensors for sensing vehicle operating conditions. The automatic transmission also includes a plurality of friction elements such as a front clutch and a rear clutch, and the system includes a plurality of shift valves for hydraulically actuating the friction elements to selectively achieve one of a plurality of speed stages. A first and second shift solenoid control the operation of a shift control valve which in turn controls the operation of the shift valves. One of the shift valves, a rear clutch valve, controls the operation of the rear clutch, and a rear clutch solenoid is provided to control the operation of the rear clutch via the rear clutch valve. The rear clutch solenoid controls the rear clutch independently of the control operations performed by the first and second shift solenoids. As a result, a controller can cause a speed stage to be skipped during a shifting operation by controlling the first and second shift solenoids and the rear clutch solenoid.

REFERENCES:
patent: 4662249 (1987-05-01), Miki et al.
patent: 4781081 (1988-11-01), Shibata et al.
patent: 5012700 (1991-05-01), Takada et al.
patent: 5038636 (1991-08-01), Vukovich et al.
patent: 5131298 (1992-07-01), Marusue
patent: 5293790 (1994-03-01), Ohashi et al.
patent: 5383825 (1995-01-01), El-Khoury et al.
patent: 5472389 (1995-12-01), Ando et al.

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