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:
Jan. 01, 2013
Filed:
Feb. 23, 2010
Paul G. Otanez, Troy, MI (US);
Shushan Bai, Ann Arbor, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
Yue-ming Chen, Canton, MI (US);
Paul G. Otanez, Troy, MI (US);
Shushan Bai, Ann Arbor, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
Yue-Ming Chen, Canton, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
The present invention provides an apparatus and method for estimating the realtime position of a clutch piston during the fill cycle using noisy pressure measurements which ensures proper and desired clutch operation. Pressures on both sides of a flow controlling orifice, at the fluid control actuator and the clutch cylinder are measured and these measurements in conjunction with other system parameters such as orifice size, clutch volume and return spring characteristics are used to solve nonlinear dynamic equations (algorithms) which reside in a microprocessor. The microprocessor provides outputs corresponding to an estimate of the current position of the clutch piston, an estimate of the current speed of the piston and an estimate of the current hydraulic pressure. The method can also be utilized to detect clutch wear.