Engine Controller for the Hydrocarbon Reduction During Cold Start in SI Engine 2002-01-1666
In order to reduce hydrocarbon emission in gasoline engine, especially during warming-up period, it is necessary to estimate the fuel and fuel product flow rate in the emission gas. The intake airflow rate should also be estimated.
A strategy was proposed to estimate air fuel ratio in a spark ignition engine. The mass of air in the cylinder was determined by filling-emptying method, and the fuel in the intake manifold and cylinder was estimated by the “wall-wetting” effect calculation. The use of graphical dynamic system control software is becoming more popular as automotive engineers strive to reduce the time to develop new control systems. The rapid prototype engine controller has been developed by using MATLAB, SIMULINK, REAL TIME WORKSHOP, xPC Target, and WATCOM C++. The sensor data from the engine will be transferred to computer, and the fuel delivery will be calculated. The fuel will be injected into the engine which is calculated by an engine controller implemented on a computer. The fuel control logic in the cold start condition was based upon the calculation considering “wall wetting” effect. By combining the techniques described above, development of a rapid prototype engine controller to reduce the hydrocarbon emission during cold start was described and discussed.