INJECTION TIMING ADAPTING METHOD AND INJECTION TIMING ADAPTING DEVICE FOR CYLINDER INJECTION ENGINE

PROBLEM TO BE SOLVED: To accurately adapting injection timing of a cylinder injection engine with a smaller number of measuring points than former devices.

SOLUTION: A relation between a ratio of fuel impinging on a cavity 37 on a piston 36 top surface and injection timing, and/or a relation between a ratio of fuel impinging on a cylinder inner wall surface (liner 35) and injection timing are simulated based on design data of an engine 11 and a fuel injection valve 31 such as spray angle, mounting angle of the fuel injection valve 31, a cylinder inner diameter, and cavity 37 position. A range of injection timing corresponding to a range where the fuel ratio to maintain good combustion is maintained is calculated, and this range of injection timing is defined as a measurement range of injection timing where measuring points are arranged in an experimental design. Process to measure engine torque with gradually changing injection timing in vicinities of an upper and a lower limit value of the measurement range is repeated, and the measurement range of injection timing is corrected to a range maintaining a good combustion condition based on the measurement results.

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