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, 2013
Filed:
May. 29, 2009
Vijay A. Neelakantan, Rochester Hills, MI (US);
Todd C. Schanz, Willis, MI (US);
Robert L. Moses, Ann Arbor, MI (US);
Bret M. Olson, Whitelake, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
Todd C. Schanz, Willis, MI (US);
Robert L. Moses, Ann Arbor, MI (US);
Bret M. Olson, Whitelake, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An automatic transmission includes a control system for controlling a clutch of the transmission. The control system includes a first variable flow solenoid and a second variable flow solenoid, each in selective fluid communication with the clutch. The first variable force solenoid provides hydraulic fluid within a first pressure range of 0 and 1,000 kPa. The second variable force solenoid provides hydraulic fluid within a second pressure range of 0 and 2,000 kPa. A transmission controller sends an electrical signal having a current between the range of 0 and 1 amp to one of the first and second variable flow solenoids. The pressure output of each of the first and second variable force solenoids is a function of, within their respective first and second pressure ranges, the amplitude of the current of the electrical signal to provide two distinct power gains to the single clutch.