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. 23, 1996
Filed:
Nov. 15, 1994
Thomas H Wilson, Indianapolis, IN (US);
Phillip F McCauley, Zionville, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An engagement control valve for a fluid operated torque transmitter, such as a clutch, has a pulse width modulated (PWM) solenoid, a valve spool and an accumulator. The PWM solenoid supplies control pressure through a flow restrictor to a control chamber adjacent one end of the valve spool which responds by establishing a proportionate engagement pressure for the torque transmitter. The accumulator has a piston slidably disposed in the valve spool, adjacent the control chamber, for fluid communication with the control pressure from the PWM solenoid. A damping chamber is formed adjacent the other end of the valve spool and is in fluid communication with an exhaust port via a flow restrictor.