Mega knock detection and inhibition system for turbo GDI engine

Abstract Mega knock is an inevitable and destructive combustion phenomenon in gasoline engine, and the tendency of mega knock occurring in GDI turbocharged engine is more serious than other engine. So in order to protect the engine, a system which can detect mega knock and inhibit the occurrence of consecutive mega knock is proposed in this paper. Firstly, the knock sensor signal is translated to the integral value, and it is identified that whether a mega knock has happened based on the integral value. Finally, some methods such as fuel enrichment will be taken to inhibit mega knock in the next cycle. The experiment results of HIL verify that this system can detect mega knock occurrence accurately, and it is indicated by the thermodynamics theorem that the inhibit strategy is reasonable.