KNOCKING DETERMINATION DEVICE FOR MULTI-FUEL INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To suppress drop of reliability of knocking determination result in a multi-fuel internal combustion engine provided with an intake air injection injector and a cylinder injection injector.

SOLUTION: In a knocking determination device for the multi-fuel internal combustion engine determining knocking of the multi-fuel internal combustion engine provided with the intake air injection injector 122 injecting one of multi-fuel to an intake air system and the cylinder injection injector 112 directly injecting other of multi-fuel in a combustion chamber based on output signal of a knock sensor 148 during predetermined knock determination period, a determination period change means changing knock determination period based on change of injection ratio of fuel injection quantity injected from each injector.

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