Patent ID: 6615771
Filing Date: 2003-09-09
Classification: F02B,F02D,Y02T

Abstract:
A method of operating a direct injection internal combustion engine operated on both spark-ignitable and autoignitable fuel, more specifically on gasoline, the operational range of the engine being allocated autoignition ranges and spark-ignition ranges, an at least nearly homogeneous fuel-air mixture being produced in the combustion chamber in autoignition ranges, a high compression ratio suitable for spontaneous ignition of the fuel being provided and the combustion in the autoignition range being mostly initiated by spontaneous ignition, and, in the ranges of spark ignition, combustion being initiated by spark ignition of said air-fuel mixture and a spark ignition range being assigned to the full load range, an autoignition range being assigned to at least part of the part load range and the effective compression ratio being lowered in spark ignition ranges and combustion controlled by regulating the residual gas content in the ranges of spontaneous ignition wherein the operational range of the engine is allocated two-stroke and four-stroke operational ranges and wherein the internal combustion engine is operated on a two-stroke cycle in the ranges operating in the two-stroke mode and on a four-stroke cycle in the ranges operating in the four-stroke mode.