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US 8,133,153 B2Granted
Transmission scheduling for multi-stroke engine
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, David Karl Bidner
Life of this patent
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Abstract
A multi-mode internal combustion engine is described. As one example, the engine may be transitioned between a two stroke mode and a four stroke mode in coordination with a transmission shift by adjusting a number of strokes performed by the engine per combustion cycle while shifting the transmission between different gear ratios.
Claims11
A method for a vehicle propulsion system including an engine coupled to a drive wheel via a transmission, comprising:
- during lower engine speeds, reducing vehicle speed by increasing a number of strokes performed by the engine per combustion cycle while increasing a transmission gear ratio;
- and
- during higher engine speeds, reducing vehicle speed by reducing a number of strokes performed by the engine per combustion cycle while maintaining the transmission gear ratio.
A method for a vehicle system including an engine coupled to a transmission, comprising:
- downshifting the transmission based on an operating condition;
- increasing a number of strokes performed by the engine per combustion cycle during a first transmission down-shift;
- and
- reducing a number of strokes performed by the engine per combustion cycle during a second transmission down-shift.
1 more element
Dependencies are inferred from the claim text.