SKIP FIRE ENGINE CONTROL
First Claim
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1. A method of controlling the operation of a spark ignition internal combustion engine including a plurality of working chambers, each working chamber being generally arranged to operate in a succession of working cycles, the method comprising:
- operating the engine in a skip fire operational mode, wherein during operation of the engine, a selected one of the working chambers will be fired during some working cycles and not fired during other working cycles; and
adjusting the spark timing associated with a selected firing of the selected working chamber based at least in part on a firing history of the selected working chamber.
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Abstract
A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In one aspect, the spark timing associated with each fired working cycle is based at least in part on the firing history of the fired working chamber.
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Citations
22 Claims
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1. A method of controlling the operation of a spark ignition internal combustion engine including a plurality of working chambers, each working chamber being generally arranged to operate in a succession of working cycles, the method comprising:
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operating the engine in a skip fire operational mode, wherein during operation of the engine, a selected one of the working chambers will be fired during some working cycles and not fired during other working cycles; and adjusting the spark timing associated with a selected firing of the selected working chamber based at least in part on a firing history of the selected working chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. An engine controller configured to direct operate a spark ignition engine in a skip fire manner in which selected working cycles are fired and selected working cycles are skipped, the engine controller including a spark timing controller arranged to determine spark timing on a firing by firing basis such that the spark timing for each skip fire firing is based at least in part on a then current firing history of an associated working chamber.
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15. A computer readable program embodied in a non-transient computer readable medium comprising programmed instruction arranged to:
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operate a spark ignition internal combustion engine in a skip fire operational mode, wherein during skip fire operation of the engine, a selected working chambers is fired during some working cycles and not fired during other working cycles; and determine a spark timing associated with a selected firing of the selected working chamber based at least in part on a firing history of the selected working chamber. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification