Patent ID: 7520260
Filing Date: 2009-04-21
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A multi-stage fuel-injection internal combustion engine comprising: a fuel injection system capable of injecting fuel at a plurality of injection timings in one operating cycle of the engine, the plurality of injection timings comprising at least one sub-injection timing in addition to a main injection timing; a variable valve actuation control system capable of changing intake valve closure timing or exhaust valve open timing by changing a valve lift characteristic or valve-open and valve-closure timings of at least one of an intake valve and an exhaust valve; and a control unit configured to define at least two domains of a specified engine operating region as a first operating range and a second operating range and to set one of the injection timings to have a predetermined first relation with either one of the intake valve closure timing and the exhaust valve open timing in the first operating range and to set one of the injection timings to have a predetermined second relation with either one of the intake valve closure timing and the exhaust valve open timing in the second operating range.