Patent ID: 7464690

Claim:
An injection method for an internal combustion engine wherein an injector injects fuel into a combustion chamber during an engine cycle having intake, compression, expansion, and exhaust strokes, the method including the following steps: a. over a low range of engine loads, injecting fuel during a low load injection occurring at a low injection pressure prior to the end of the compression stroke; b. over a range of greater engine loads, injecting fuel: (1) during one or more starting greater load injections occurring between the start of the intake stroke and the end of the compression stroke; and (2) during one or more ending greater load injections occurring prior to the end of the expansion stroke, the ending greater load injections each having: (a) higher injection pressure than the injection pressure of any of the starting greater load injections, and (b) lower injected fuel volume than the total injected fuel volume of all starting greater load injections.