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:
May. 15, 2007
Filed:
May. 14, 2004
Jy-jen F. Sah, West Bloomfield, MI (US);
Gregory A. Hubbard, Brighton, MI (US);
Adam C. Bennett, McCordsville, IN (US);
Todd M. Steinmetz, Indianapolis, IN (US);
Michael D. Foster, Carmel, IN (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
Gregory A. Hubbard, Brighton, MI (US);
Adam C. Bennett, McCordsville, IN (US);
Todd M. Steinmetz, Indianapolis, IN (US);
Michael D. Foster, Carmel, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A method for providing an active engine stop of the engine of a hybrid electric vehicle. The method utilizes the electric machine to oppose and rapidly stop the rotation of the engine at a controlled rate. The method includes the calculation of an input speed reduction trajectory using the engine speed when the active engine stop request is made and a predetermined speed reduction interval. The speed reduction interval is less than a time from the active stop request to the shutoff command to the electric machine The method provides rapid deceleration of the engine, particularly through the powertrain resonance speed, reducing the amount of vibration energy dissipated through the powertrain and chassis. The method removes the electric machine torques from the engine prior to achieving zero engine speed in order to avoid imparting a negative engine speed or counter-rotation of the engine.