Automatic transmission control system for automotive vehicle

Details Automatic transmission control system for automotive vehicle Automatic transmission control system for automotive vehicle

1993-07-21

1994-08-30

Bui, Thuy M.

Endless belt power transmission systems or components

Control for forward and reverse

474 28, F16H 6100

Patent

active

053422465

ABSTRACT:
A control system for an automatic transmission of an automotive vehicle is provided. This control system includes a forward speed holding valve which is arranged in a hydraulic line communicating between a manual selector valve and a reverse frictional element such as a low and reverse brake, and has a first valve position which establishes fluid communication between the manual selector valve and the reverse frictional element to supply the hydraulic pressure from the manual selector valve to the reverse frictional element and a second valve position which blocks the fluid communication therebetween. When a selector lever is shifted to a reverse position while a vehicle is parked, the forward speed holding valve is controlled to assume the first valve position to engage the reverse frictional element. When the selector lever is placed in the reverse position while the vehicle is traveling forward, the forward speed holding valve is controlled to assume the second valve position to release the reverse frictional element for preventing the automatic transmission from shifting to a reverse mode when a driver mistakenly shift the selector lever to the reverse range during traveling forward.

REFERENCES:
patent: 4982822 (1991-01-01), Petzold et al.
patent: 5188007 (1993-02-01), Hattori et al.

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