METHOD AND APPARATUS FOR DETERMINING OPTIMUM SKIP FIRE FIRING PROFILE
First Claim
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1. A skip fire engine controller comprising:
- a skip fire profile module arranged to determine an operational firing fraction and associated cylinder load for delivering a desired engine output, wherein the skip fire profile module is arranged to select the operational firing fraction from a set of available firing fractions, wherein the set of available firing fractions varies as a function of cylinder load such that more firing fractions are available at lower cylinder loads than at higher cylinder loads; and
a firing controller arranged to direct firings in a skip fire manner that delivers the selected operational firing fraction.
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Abstract
In one aspect, a skip fire engine controller is described. The skip fire engine controller includes a skip fire module arranged to determine an operational firing fraction and associated cylinder load for delivering a desired engine output. The skip fire engine controller also includes a firing controller arranged to direct firings in a skip fire manner that delivers the selected operational firing fraction. Various methods, modules, lookup tables and arrangements related to the selection of a suitable operational firing fraction are also described.
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Citations
22 Claims
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1. A skip fire engine controller comprising:
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a skip fire profile module arranged to determine an operational firing fraction and associated cylinder load for delivering a desired engine output, wherein the skip fire profile module is arranged to select the operational firing fraction from a set of available firing fractions, wherein the set of available firing fractions varies as a function of cylinder load such that more firing fractions are available at lower cylinder loads than at higher cylinder loads; and a firing controller arranged to direct firings in a skip fire manner that delivers the selected operational firing fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A skip fire engine controller comprising:
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a lookup table embodied in a computer readable media, the lookup table including table entries that indicate different maximum allowable cylinder loads at different vehicle operating parameters; a skip fire profile module arranged to determine an operational firing fraction suitable for delivering a requested engine output, wherein the skip fire profile module utilizes the lookup table to determine the operational firing fraction; and a firing controller arranged to direct firings in a skip fire manner that delivers the operational firing fraction. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of selecting an operational skip fire firing profile suitable for use in operating an internal combustion engine in a skip fire manner to produce a desired engine output, the method comprising:
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determining a desired engine output; selecting a plurality of candidate firing fractions from an allowed list of firing fractions; calculating a candidate cylinder load for each of the plurality of candidate firing fractions such that the combination of the candidate cylinder load and each associated candidate firing fraction substantially yields the desired engine output, each such combination being a candidate skip fire firing profile; selecting one of the candidate skip fire firing profiles as the operational skip fire firing profile; and operating the internal combustion engine based at least in part on the operational skip fire firing profile. - View Dependent Claims (19, 20, 21, 22)
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Specification