Neutral idle control mechanism for a torque-transmitting clutch

Details Neutral idle control mechanism for a torque-transmitting clutch Neutral idle control mechanism for a torque-transmitting clutch

1999-06-01

2000-09-26

Bonck, Rodney H.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477114, 477121, 137112, 91447, B60K 4106

Patent

active

061236454

ABSTRACT:
A control for a power transmission has a neutral idle circuit comprised of a signal valve, a control valve and a shuttle valve. The signal valve supplies a bias pressure to the control valve, which has an output control pressure proportional to the input torque to the transmission. The output control pressure and transmission line pressure act on the shuttle valve to direct the control pressure to a clutch in the transmission when the output pressure is below a predetermined percentage of the transmission line pressure and to direct line pressure to the clutch when the predetermined percentage is exceeded. This permits the clutch to be controlled at or below a slipping engagement state.

REFERENCES:
patent: 4476745 (1984-10-01), Moan
patent: 4603604 (1986-08-01), Nishikawa et al.
patent: 4660442 (1987-04-01), Nishikawa et al.
patent: 4686872 (1987-08-01), Aoki et al.
patent: 4840092 (1989-06-01), Sakaguchi et al.
patent: 4850251 (1989-07-01), Kuwayama et al.

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