Patent ID: 9284906
Filing Date: 2016-03-15
CPC Classification: F02D,F02P,Y02T

Claim Text:
1. A method for controlling combustion in a spark-ignition direct-injection internal combustion engine, including an engine controller, a spark-ignition system and a fuel injector, comprising: providing an initial injected fuel mass timing; providing a respective upper bound for each of the initial injected fuel mass timing and an initial spark ignition timing corresponding to respective crank angle locations having most advanced timings acceptable for avoiding excessive combustion noise at a desired engine load; providing a respective lower bound for each of the initial injected fuel mass timing and the initial spark ignition timing corresponding to respective crank angle locations having most retarded timings acceptable for avoiding combustion stability deterioration at the desired engine load; adjusting the lower bounds for the initial injected fuel mass timing and the initial spark ignition timing based on an intake O monitoring a combustion phasing error based on deviations between a monitored combustion phasing from a previous cycle and a desired combustion phasing; generating a bounded control signal associated with the monitored combustion phasing error and defined by an upper bound and a lower bound; determining an adjusted fuel mass timing comprising interpolating between the upper and lower bounds for the initial injected fuel mass timing based on the upper and lower bounds of the generated bounded control signal associated with the monitored combustion phasing error; determining an adjusted spark ignition timing comprising interpolating between the upper and lower bounds for the initial spark ignition timing based on the upper and lower bounds of the generated bounded control signal associated with the monitored combustion phasing error; and controlling the spark-ignition system and the fuel injector with the determined adjusted fuel mass timing and the determined adjusted spark ignition timing.