METHOD AND APPARATUS FOR DETERMINING OPTIMUM SKIP FIRE FIRING PROFILE WITH ROUGH ROADS AND ACOUSTIC SOURCES
First Claim
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1. A skip fire engine controller comprising:
- a skip fire profile module arranged to monitor noise and vibration generated by one or more sources external to an engine and determine an operational firing fraction and associated cylinder load for delivering a desired engine output, wherein the selection of the operational firing fraction is based at least in part on whether noise and vibration generated external to the engine at least partially masks noise and vibration generated by the engine; 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
21 Claims
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1. A skip fire engine controller comprising:
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a skip fire profile module arranged to monitor noise and vibration generated by one or more sources external to an engine and determine an operational firing fraction and associated cylinder load for delivering a desired engine output, wherein the selection of the operational firing fraction is based at least in part on whether noise and vibration generated external to the engine at least partially masks noise and vibration generated by the engine; 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)
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11. A skip fire engine controller comprising:
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at least one lookup table embodied in a non-transitory computer readable media, the at least one 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 at least one lookup table to determine the operational firing fraction and adjust the operational firing fraction based at least in part on whether noise and vibration generated external to the engine at least partially masks noise and vibration generated by the engine; and a firing controller arranged to direct firings in a skip fire manner that delivers the operational firing fraction. - View Dependent Claims (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; detecting noise and vibration masking associated with noise and vibration generated external to the engine at least partially masking noise and vibration generated by the engine; and selecting a firing fraction based at least in part on the detected noise and vibration masking. - View Dependent Claims (19, 20, 21)
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Specification