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Method for controlling exhaust gas heat recovery systems in vehicles

United States Patent

8,463,495
June 11, 2013
View the Complete Patent at the US Patent & Trademark Office
A method of operating a vehicle including an engine, a transmission, an exhaust gas heat recovery (EGHR) heat exchanger, and an oil-to-water heat exchanger providing selective heat-exchange communication between the engine and transmission. The method includes controlling a two-way valve, which is configured to be set to one of an engine position and a transmission position. The engine position allows heat-exchange communication between the EGHR heat exchanger and the engine, but does not allow heat-exchange communication between the EGHR heat exchanger and the oil-to-water heat exchanger. The transmission position allows heat-exchange communication between the EGHR heat exchanger, the oil-to-water heat exchanger, and the engine. The method also includes monitoring an ambient air temperature and comparing the monitored ambient air temperature to a predetermined cold ambient temperature. If the monitored ambient air temperature is greater than the predetermined cold ambient temperature, the two-way valve is set to the transmission position.
Spohn; Brian L. (Holly, MI), Claypole; George M. (Fenton, MI), Starr; Richard D (Milford, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 957,755
20120143437
December 1, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with U.S. Government support under an Agreement/Project number: vss018, DE-FC26-08NT04386, A000, awarded by the Department of Energy. The U.S. Government may have certain rights in this invention.