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Method for controlling powertrain pumps

United States Patent

October 22, 2013
View the Complete Patent at the US Patent & Trademark Office
A method of controlling a pump supplying a fluid to a transmission includes sensing a requested power and an excess power for a powertrain. The requested power substantially meets the needs of the powertrain, while the excess power is not part of the requested power. The method includes sensing a triggering condition in response to the ability to convert the excess power into heat in the transmission, and determining that an operating temperature of the transmission is below a maximum. The method also includes determining a calibrated baseline and a dissipation command for the pump. The calibrated baseline command is configured to supply the fluid based upon the requested power, and the dissipation command is configured to supply additional fluid and consume the excess power with the pump. The method operates the pump at a combined command, which is equal to the calibrated baseline command plus the dissipation command.
Sime; Karl Andrew (Mason, MI), Spohn; Brian L. (Holly, MI), Demirovic; Besim (Troy, MI), Martini; Ryan D. (Wolverine Lake, MI), Miller; Jean Marie (Plymouth, MI)
GM Global Technology Operations LLC (Detroit, MI)
13/ 211,775
August 17, 2011
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with U.S. Government support under an Agreement/Project number: DE-FC26-08NT04386, awarded by the Department of Energy. The U.S. Government may have certain rights in this invention.