Yao Dongwei

An Application of Real-Time Engine Model in HILS Simulation and Testing Platform Based on SIMULINK

Engine model is one of the most important part in HILS for ECU testing. There are shortages in normal ones, such as big framework and complex structure of software design which result in the immense calculated amount, disadvantage of hardware drive ability and bad real-time as well. In this article, the strong simulation function of MATLAB/SIMULINK was used. Engine model was built based on the mean value model, parameters involved was recognized. The comparison between simulation and bench test validation shows that the engine model could simulate at all working condition. The relative error of test result is less than ±3% in steady operating conditions, and ±6% in transient operating conditions. Which meets the demand of the application for HILS.

A reduced combustion kinetic model for the methanol-gasoline blended fuels on SI engines

A reduced combustion kinetic model for the methanol-gasoline blended fuels for SI engines was developed. Sensitivity analysis and rate constant variation methods were used to optimize the kinetic model. Flame propagation, shock-tube and jet-stirred reactor systems were modeled in CHEMKIN. The laminar flame speed, ignition delay time and change in concentrations of species were simulated using the reduced kinetic model. The simulation results of reduced chemical mechanism agreed well with the relevant experimental data published in the literature. The experimental investigations on engine bench were also carried out. The in-cylinder pressure and exhaust emissions were obtained by using a combustion analyzer and an FTIR (Fourier transform infrared spectroscopy) spectrometer. Meanwhile, an engine in-cylinder CFD model was established in AVL FIRE and was coupled with the proposed reduced chemical mechanism to simulate the combustion process of methanol-gasoline blends. The simulated combustion process showed good agreement with the engine experimental results and the predicted emissions were found to be in accordance with the FTIR results.