US Patent No. 10,247,121

METHOD AND APPARATUS FOR DETERMINING OPTIMUM SKIP FIRE FIRING PROFILE


Patent No. 10,247,121
Issue Date April 02, 2019
Title Method And Apparatus For Determining Optimum Skip Fire Firing Profile
Inventorship Mark A. Shost, Northville, MI (US)
Louis J. Serrano, Los Gatos, CA (US)
Steven E. Carlson, Oakland, CA (US)
Vijay Srinivasan, Farmington Hills, MI (US)
Eric J. Defenderfer, Brighton, MI (US)
Nitish J. Wagh, Northville, MI (US)
Randall S. Beikmann, Brighton, MI (US)
Jinbiao Li, Rochester Hills, MI (US)
Xin Yuan, Palo Alto, CA (US)
Li-Chun Chien, Milpitas, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US) GM Global Technology Operations L...

Claim of US Patent No. 10,247,121

1. A skip fire engine controller arranged to direct operation of an engine in a skip fire manner to deliver a desired engine output, the skip fire engine controller comprising:a skip fire profile determination unit arranged to determine an operational firing fraction for delivering the desired engine output,
wherein the skip fire profile determination unit is arranged to select the operational firing fraction from among a plurality of candidate firing fractions that are each capable of delivering the desired engine output, each of the plurality of candidate firing fractions having a corresponding maximum allowable cylinder load, wherein each of the corresponding maximum allowable cylinder loads indicates a maximum allowable cylinder torque fraction when the engine is operating at the associated one of the plurality of candidate firing fractions under specified operating conditions,
wherein the maximum allowable cylinder torque fraction for at least some of the plurality of candidate firing fractions at some specified operating conditions is less than one, each of the plurality of candidate firing fractions having an associated maximum allowable engine output that is attainable by operating the engine at such candidate firing fraction at the associated maximum allowable cylinder load,
wherein at a selected engine speed, the maximum allowable engine output for a first one of the candidate firing fractions is higher than the maximum allowable engine output for a second one of the candidate firing fractions, the second one of the candidate firing fractions being higher than the first one of the candidate firing fraction, and
wherein the operational firing fraction is selected at least partially based on the corresponding maximum allowable cylinder load not being exceeded when the engine is firing at the operational firing fraction and operating at the desired engine output; and
a firing control unit arranged to direct firings of cylinders of the engine in the skip fire manner in accordance with the operational firing fraction, the operational firing fraction resulting in the desired engine output of the engine without exceeding the maximum allowable cylinder load associated with the operational firing fraction.