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:
Jun. 09, 1992
Filed:
Apr. 29, 1991
William J Vukovich, Ypsilanti, MI (US);
Melissa M Koenig, Ann Arbor, MI (US);
Donald F Scherer, Redford, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An electronically mechanized control method for regulating the engagement rate or stroke time of a fluid operated torque transmitting device, wherein the flow rate is controlled with a flow control device having a low flow state and a high flow state. The shift is initiated with the flow control device in the high flow state. After a variable delay time, the flow control valve is activated to the low flow state to complete the shift. The delay time is scheduled as an open-loop function of various system parameters to achieve the optimum amount of overlap between the on-coming and off-going torque transmitting devices. An adaptive learning control superimposed on the open-loop control trims the open-loop schedule to compensate for changes in system parameters or tolerance variations which affect the stroke time.