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:
Oct. 19, 2004
Filed:
Dec. 23, 2002
Greg E. Ford, Redford, MI (US);
Peter M. Jacobsen, Oakland Township, MI (US);
Harold L. Bowman, Lapeer, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A method of controlling hydraulic shift clutch actuators in an automatic speed change power transmission of the type having an electronic controller (TCU) for energizing a solenoid operated valve to control each hydraulic clutch actuator. A pressure sensor is disposed to sense the hydraulic pressure (P ) to each clutch actuator and provides an electrical signal to the TCU which also receives a clutch pressure command signal (P ) from the vehicle powertrain computer. The TCU computes the differential &Dgr;P=P −P and determines the valve energization current I from known relationships between &Dgr;P and the percentage of maximum valve current and repeats the process in real time to adjust I until &Dgr;P is negligible.