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:
Mar. 03, 2015
Filed:
May. 24, 2012
Poh Fong Chin, Novi, MI (US);
Jean Marie Miller, Plymouth, MI (US);
Allen J. Lehmen, Howell, MI (US);
Valerie Zelko Byrd, Novi, MI (US);
Poh Fong Chin, Novi, MI (US);
Jean Marie Miller, Plymouth, MI (US);
Allen J. Lehmen, Howell, MI (US);
Valerie Zelko Byrd, Novi, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A powertrain system includes an internal combustion engine configured to execute autostop and autostart operations, and a multi-mode transmission with an electrically-powered hydraulic pump configured to provide pressurized hydraulic fluid to a hydraulic circuit. A Method for controlling operation of the hydraulic pump includes operating the hydraulic pump in a low power mode only when the engine is in an engine-off state, operator inputs to a brake pedal, an accelerator pedal, and a transmission range selector are within allowable states, temperatures of select transmission components are within respective predetermined temperature ranges, and transmission output torque is less than a threshold torque request.