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Method of controlling temperature of a thermoelectric generator in an exhaust system

United States Patent

8,443,594
May 21, 2013
View the Complete Patent at the US Patent & Trademark Office
A method of controlling the temperature of a thermoelectric generator (TEG) in an exhaust system of an engine is provided. The method includes determining the temperature of the heated side of the TEG, determining exhaust gas flow rate through the TEG, and determining the exhaust gas temperature through the TEG. A rate of change in temperature of the heated side of the TEG is predicted based on the determined temperature, the determined exhaust gas flow rate, and the determined exhaust gas temperature through the TEG. Using the predicted rate of change of temperature of the heated side, exhaust gas flow rate through the TEG is calculated that will result in a maximum temperature of the heated side of the TEG less than a predetermined critical temperature given the predicted rate of change in temperature of the heated side of the TEG. A corresponding apparatus is provided.
Prior; Gregory P. (Birmingham, MI), Reynolds; Michael G. (Troy, MI), Cowgill; Joshua D. (Harland, MI)
GM Global Technology Operations LLC (Detroit, MI)
12/ 753,344
20110240080
April 2, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Department of Energy Agreement number DE-FC26-04NT42278. The government may have certain rights in the invention.