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. 18, 2006
Filed:
May. 14, 2004
Jy-jen F. Sah, West Bloomfield, MI (US);
Gregory A. Hubbard, Brighton, MI (US);
William R. Cawthorne, Milford, MI (US);
Xuefeng T. Tao, Northville, MI (US);
Todd M. Steinmetz, Indianapolis, IN (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
Gregory A. Hubbard, Brighton, MI (US);
William R. Cawthorne, Milford, MI (US);
Xuefeng T. Tao, Northville, MI (US);
Todd M. Steinmetz, Indianapolis, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A powertrain includes a diesel compression engine and an electric machine operatively coupled thereto and effective to rotate the engine during engine cranking. Cold engine cranking is accomplished in a staged manner including a first stage wherein the engine is cranked to a first speed below the resonant speed of the coupled engine and electric machine combination for a first duration and thereafter cranked to a second speed above the resonant speed for a second duration. Transition out of cranking at the first and second speeds is accomplished when relative combustion stability is demonstrated. Cranking at the first or second speed is aborted when excessive crank times or if low battery voltages are observed. A third stage is included wherein the engine is cranked to a third speed below the engine idle speed. Transition out of cranking at the third speed is accomplished when relative combustion stability is demonstrated, whereafter normal engine control takes over.