Control system for automatic transmission

Details Control system for automatic transmission Control system for automatic transmission

1997-09-04

1999-07-13

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

475 63, F16H 6120

Patent

active

059218843

ABSTRACT:
A control system for an automatic transmission includes a clutch for transmitting the rotation of a fluid transmission unit to a speed change mechanism of a transmission and a hydraulic servo for applying/releasing the clutch. A stop state detector is provided for detecting the stop state of the vehicle. A release control oil pressure changer lowers the oil pressure of the hydraulic servo by a first set pressure when the vehicle stop state is detected. An in-neutral control oil pressure changer raises the oil pressure of the hydraulic servo by a second set pressure, when the difference between the input side RPM and the output side RPM of the fluid transmission unit has not changed, and lowers the same by a third set pressure when the rotational speed difference has changed. The first set pressure is different from the second and third set pressures.

REFERENCES:
patent: 3662621 (1972-05-01), Hirozawa
patent: 4651593 (1987-03-01), Aoki et al.
patent: 4730708 (1988-03-01), Hamano et al.
patent: 4775938 (1988-10-01), Hiramatsu
patent: 5272630 (1993-12-01), Brown et al.
patent: 5542887 (1996-08-01), Tsukamoto et al.
patent: 5653660 (1997-08-01), Tsukamoto et al.
patent: 5769753 (1998-06-01), Kusafuka et al.

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