Patent ID: 11959428
Assignee: ETHANOL BOOSTING SYSTEMS, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A spark ignition engine having port fuel injectors and direct fuel injectors;
wherein the port fuel injectors and direct fuel injectors introduce a same fuel into the spark ignition engine;
wherein the same fuel that is introduced into the spark ignition engine comprises gasoline;
wherein at an earliest time in cold start, the spark ignition engine is fueled with direct fuel injection alone;
wherein following the earliest time in cold start, port fuel injection is introduced;
wherein stop-start engine operation is used during deceleration and idling;
wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection alone at an end of engine shutdown;
wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection alone when it is restarted;
wherein after the spark ignition engine is restarted with direct fuel injection alone, port fuel injection is introduced;
wherein in a portion of a drive cycle, the spark ignition engine is fueled with port fuel injection alone;
wherein in a second part of the drive cycle, the spark ignition engine is fueled with both port fuel injection and direct fuel injection; and
wherein in certain portions of the second part of the drive cycle, a relative amount of fueling provided by port fuel injection is increased accompanied by a change in spark timing changed so as to become more retarded;
and wherein, in certain other portions of the second part of the drive cycle, the relative amount of fueling provided by port injection increases with increasing torque.