Ignition Delay Model of Multiple Injections in CI engines
In compression ignition engines, the combustion starts after the ignition delay period from the start of injection. The degree of mixing between air and fuel during the period have an impact on the combustion characteristic such as pressure rise rate which can worsen the combustion noise. The formation of particulate matter and nitrogen oxides also can be affected. In addition, ignition delay is required when estimating the in-cylinder pressure since it can provide information about the start of combustion. Therefore, a semi-empirical and 0-dimensional ignition delay model has been developed in this study for real-time control applications. As the ignition delay consists of physical and chemical delays in CI engines, the integrated ignition delay model established in this paper considered both of them.