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:
Sep. 23, 1997
Filed:
May. 06, 1996
Charles Francis Long, Pittsboro, IN (US);
Martin Robert Dadel, Indianapolis, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A hydraulic control for a transmission has a main line regulator, a torque converter clutch relay valve and a torque converter clutch solenoid valve. During torque converter operation, the pressure regulator is subjected to a line pressure bias signal and supplies pressurized hydraulic fluid to a control system at a substantially constant pressure level. During torque converter clutch operation, the pressure regulator is subjected to an additional line pressure bias signal and a variable pressure bias signal from the torque converter clutch solenoid valve to provide a modulated pressure control whereby main pressure is varied proportionally with torque converter clutch apply pressure.