Patent ID: 7783412

Claim:
A method for determining a timing of an injection cycle with respect to an operating cycle of each cylinder of a four-stroke (ADM, COMP, DET, ECH) engine, wherein the timing of the injection cycle is one of correct with respect to the operating cycle or out-of-synchronism with respect to the operating cycle, the method comprising: running the engine while making a first change to a first operating parameter of the engine designed to cause, in the running of the engine, a first set of effects; and at the same time as the first change is made, making a second change to a second operating parameter of the engine, wherein the second change is designed to cause, in the running of the engine, a second set of effects which compensate for the first set of effects when the timing of the injection cycle is correct with respect to the operating cycle, and wherein the second set of effects do not compensate for the first set of effects when the timing of the injection cycle is out-of-synchronism with respect to the operating cycle, and wherein the first set of effects is different based on whether the timing of the injection cycle is correct or out-of-synchronism with respect to the operating cycle.