Forward drive release system for automatic transmission

Details Forward drive release system for automatic transmission Forward drive release system for automatic transmission

1982-06-28

1985-04-30

Gruber, Felix D.

Boots, shoes, and leggings

192 0033, 192 0076, B60K 4128, G05B 1502, G05D 1702

Patent

active

045148112

ABSTRACT:
A control system for reducing the torque applied to an automotive engine when the vehicle is idling and the transmission is set for operation in an acceptable drive range includes sensors to determine the manual gear selector position, output shaft speed, engine speed, turbine speed, and the throttle valve position. A solenoid operated valve opens and closes a source of high pressure fluid to a clutch whose engagement is required to transmit torque through the transmission from the engine to the drive wheels. An electronic computer is supplied with the digital equivalent of the shaft speeds, the position of the gear selector and of the throttle. An equation for determining the duty cycle of the solenoid valve coils is repetitively calculated through the use of a computer program algorithm. The equation corrects a previously calculated duty cycle with feedback error and terms that are proportional to the magnitude of the present error and the magnitude of the previous error.

REFERENCES:
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patent: 1996282 (1935-04-01), Drabin et al.
patent: 2608880 (1952-02-01), Flinn
patent: 4105101 (1978-08-01), Forster et al.
patent: 4200175 (1980-04-01), Dick
patent: 4298109 (1981-11-01), Dorpmund et al.
patent: 4324322 (1982-04-01), Sibeud
patent: 4343387 (1982-08-01), Hofbauer
patent: 4361060 (1982-11-01), Smyth
patent: 4401199 (1983-08-01), Takano et al.

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