Back to results
US 7,680,575 B2Granted
Selecting transmission ratio based on performance drivability and fuel economy
AssigneeGM Global Technology Operations LLC
InventorsEd E. Han, Joseph L. Wanamaker
Life of this patent
Estimating the term…
Abstract
A transmission control system for a vehicle includes a driver input device that generates a driver input signal and a control module that receives the driver input signal. The control module determines an operating mode of a transmission based on the driver input signal and selects a gear ratio of the transmission based on the operating mode. The operating mode includes one of a maximum performance mode, a power mode and a fuel economy mode.
Claims21
A method of determining a gear ratio of a transmission that has N gear ratios, where N is an integer, comprising:
- generating a driver input position value;
- selecting an operating mode of said transmission from a plurality of operating modes, each of said operating modes having different gear ratio selection criteria, based on said driver input position value, wherein said operating modes include a maximum performance mode, a power mode, a coast mode and a fuel economy mode;
- selecting to one of up-shift and down-shift said transmission;
- determining M ones of said N gear ratios that satisfy gear ratio selection criteria of said selected operating mode and that are associated with said selected one of said up-shift and said down-shift, where M is an integer greater than 1 and less than or equal to N;
- selecting a gear ratio of said M ones of said N gear ratios;
- and
- performing said selected one of said up-shift and said down-shift based on said selected gear ratio of said M ones of said N gear ratios.
4 more elements
Dependencies are inferred from the claim text.