FIRING FRACTION MANAGEMENT IN SKIP FIRE ENGINE CONTROL
First Claim
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1. A skip fire engine controller comprising:
- a firing fraction determining unit arranged to determine an operational firing fraction and associated engine settings for delivering a desired engine output, wherein the firing fraction determining unit is arranged to select the firing fraction from a set of available firing fractions, wherein the set of available firing fractions varies as a function of engine speed such that more firing fractions are available at higher engine speeds than at lower engine speeds; 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 various described embodiments skip fire control is used to deliver a desired engine output. A controller determines a skip fire firing fraction and (as appropriate) associated engine settings that are suitable for delivering a requested output. In one aspect, the firing fraction is selected from a set of available firing fractions, with the set of available firing fractions varying as a function of engine speed such that more firing fractions are available at higher engine speeds than at lower engine speeds. The controller then direct firings in a skip fire manner that delivers the selected fraction of firings.
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Citations
37 Claims
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1. A skip fire engine controller comprising:
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a firing fraction determining unit arranged to determine an operational firing fraction and associated engine settings for delivering a desired engine output, wherein the firing fraction determining unit is arranged to select the firing fraction from a set of available firing fractions, wherein the set of available firing fractions varies as a function of engine speed such that more firing fractions are available at higher engine speeds than at lower engine speeds; 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, 9, 10, 11, 12, 13, 14, 27)
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15. A skip fire engine controller comprising:
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a firing fraction determining unit arranged to determine a commanded operational firing fraction; a firing controller arranged to direct firings in a skip fire manner that delivers the operational firing fraction, wherein the firing controller is arranged to track a portion of a firing that has been requested but not yet directed by the firing controller to thereby help manage transitions between different commanded firing fractions; and a filter arranged to spread commanded firing fraction changes over multiple firing opportunities. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28)
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26. A skip fire engine controller comprising:
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a firing fraction determining unit arranged to receive an input signal indicative of a desired engine output and to output a commanded firing fraction arranged to deliver the desired engine output; a firing controller arranged to direct firings in a skip fire manner that delivers the determined firing fraction, wherein the firing controller is arranged to track a portion of a firing that has been requested but not yet directed by the firing controller to thereby help manage transitions between different commanded firing fractions; a power train parameter adjusting block arranged to cause the adjustment of at least one selected power train control parameter sufficiently such that the engine outputs the desired output at the commanded firing fraction, and a filter having a filter response arranged to substantially match a response of the at least one selected power train control parameter, the filter being arranged to cause changes in the commanded firing fraction to correspond to changes in the at least one selected power train control parameter.
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29. A method of determining a firing fraction for use by a skip fire engine controller arrange to direct engine working chamber firings in a skip fire manner to deliver a desired engine output:
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providing a multiplicity of available firing fractions that are suitable for use under selected operational conditions wherein the number of available firing fractions vary as a function of engine speed; and selecting an operational firing fraction based at least in part upon the desired engine output and a current engine speed. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification