The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1985
Filed:
Jun. 28, 1982
John A Daubenmier, Canton, MI (US);
Elias T Boueri, Farmington, MI (US);
Ford Motor Company, Dearborn, MI (US);
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.