| United States Patent | 7,277,781 |
| Cawthorne , et al. | October 2, 2007 |
Method of under voltage protection during engine cranking Abstract A method for controlling the cranking of an engine of a vehicle powertrain system having a rechargeable energy storage system that is adapted to provide electric power to an electric machine, wherein the system is adapted to exit from the engine crank state as a function of an output voltage of the energy storage system to the electric machine during the crank state, if the output voltage is less than a crank undervoltage threshold for a predetermined crank time. According to the method, the crank undervoltage threshold is a function of the number of failed start attempts, generally decreasing as a function of the number of failed start attempts. The predetermined crank time is a function of a magnitude of a difference between the output voltage and the crank undervoltage threshold.
| Inventors: | Cawthorne; William R. (Milford, MI), Nitz; Larry T. (Brighton, MI) |
| Assignee: | General Motors Corporation (Detroit, MI)
DaimlerChrysler AG (Stuttgart, DE)
DaimlerChrysler Corporation (Auburn Hills, MI)
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| Appl. No.: | 10/845,999 |
| Filed: | May 14, 2004 |
| Current U.S. Class: | 701/22 ; 180/65.2; 701/113 |
| Current International Class: | G06F 17/00 (20060101) |
References Cited [Referenced By]
U.S. Patent Documents Foreign Patent Documents
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| WO 03/049965 |
| Jun., 2003 |
| WO |
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Primary Examiner: Zanelli; Michael J.
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