Investigation of Control Variable Effects on Combustion Parameters under Lean Operation Mode

This paper presents an investigation of control variables, which are throttle angle (TA), spark advance (SA) and variable valve timing (VVT), on combustion parameters of a commercial gasoline engine under lean combustion. The parameters considered in this work are the location of 50% of mass fraction burned (CA50) and the location of peak pressure (LPP). These parameters are calculated online using the algorithm that can be implemented on MATLAB/Simulink platform and then complied in C-code and real-time executed on the dSPACE1006. The lean combustion experiments are conducted on the engine test bench consists of a six cylinders gasoline commercial engine with a low inertia dynamometer. Based on the experimental results, the effects of considered control variables on combustion parameters can be investigated. Additionally, we can use this information for improvement of lean combustion control performance and reduce the combustion variability.