Patent ID: 8855876

Claim:
A system for managing a temperature of a working fluid in a vehicle powertrain, the vehicle powertrain including a power source configured to output torque and a transmission including a plurality of gear ratios and the working fluid, the transmission selectively coupled to the power source and configured to utilize a selected one of the plurality of gear ratios to selectively multiply and output the torque from the power source, the system comprising: a temperature sensor in thermal contact with the working fluid and configured to output data indicative of a real-time temperature of the working fluid; and a controller in electrical communication with the temperature sensor and at least one of the power source and the transmission, the controller configured to, compare the data from the temperature sensor to a temperature threshold, select a terminal speed limit when the data indicates that real-time temperature is less than or substantially equal to the temperature threshold, the terminal speed limit is independent of the selected one of the plurality of gears, select a reduced speed limit when the data indicates that real-time temperature is greater than the temperature threshold, wherein the reduced speed limit is less than the terminal speed limit and the reduced speed limit is independent of the selected one of the plurality of gears, and limit the torque output by at least one of the power source and the transmission to limit the speed of the vehicle to the selected one of the terminal speed limit and the reduced speed limit.