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:
Nov. 11, 2014
Filed:
Sep. 20, 2013
GM Global Technology Operations Llc, Detroit, MI (US);
Randall B. Dlugoss, Royal Oak, MI (US);
Matthew Pruski, Brighton, MI (US);
Dara Monajemi, Lansing, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A vehicle includes an engine, an engine control module (ECM), and a transmission assembly. The transmission assembly includes a transmission control module (TCM), a stationary member, gear sets, an input member connected to the engine and one of the gear sets, and a binary clutch assembly. The binary clutch assembly has a freewheeling element and a binary device preventing rotation of the binary clutch assembly when applied, and allows the binary clutch assembly to freewheel when released. The TCM controls a slip speed differential of the binary clutch assembly when the vehicle is coasting in a forward gear state. The TCM determines a threshold maximum slip speed differential, calculates a required engine speed for achieving no more than the threshold maximum, and transmits the required engine speed to the ECM to maintain engine speed at or above the required engine speed. Doing so enables transmission state and direction change flexibility.