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US 11,236,689 B2Granted
Skip fire valve control
AssigneeTula Technology, Inc.
InventorsXin Yuan, Matthew A. Younkins
Life of this patent
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AssigneeTula Technology, Inc.
InventorsXin Yuan, Matthew A. Younkins
Estimating the term…
In various aspects, internal combustion engines, engine controllers and methods of controlling engines are described. The engine includes a camshaft and a two cylinder sets. Cylinders in the first are deactivatable and cylinders in the second set may be fired at high or low output levels. The air charge for each fired working cycle is set based on whether a high or low torque output is selected. In some implementations, the camshaft is axially shiftable between first and second positions. First cam lobes are configured to cause their associated cylinders to intake a large air charge during intake strokes that occur when the camshaft is in the first position. Second cam lobes for cylinders in the second set cause their associated cylinders to intake a smaller air charge when the camshaft is in the second position. Second cam lobes for cylinders in the first set deactivate their associated cylinders.
A method of operating an engine having a plurality of cylinders, each cylinder having an associated intake valve and an associated exhaust valve, the method comprising:
An engine controller configured to direct skip fire operation of an engine having a plurality of cylinders, each cylinder having an associated intake valve and an associated exhaust valve, wherein during the skip fire operation of the engine, selected cylinders working cycles are skipped and selected cylinder working cycles are fired, the engine controller being further configured to:
An engine comprising:
Dependencies are inferred from the claim text.