International Federation of Television Archives

<div class="htmlview paragraph">Numerical simulation can be effectively used to reduce the experimental tests which are nowadays required for the analysis and calibration of engine control systems. In particular in this paper the use of a one-dimensional engine model to analyze the response of an UEGO sensor in the exhaust manifold of a 4 cylinder s.i. engine (with multipoint fuel injection) is described: numerical simulation has been used to simulate a misfunction of the fuelling system, which caused one of the four cylinders to be fuelled with an air/fuel ratio that was 10% richer than the others. The simulated UEGO response was then compared with experimental measurements, and after this validation process, the sensor model can be used to study a proper fuel injection control strategy thus reducing the required experimental tests, as outlined in a test case presented at the end of the paper.</div>

<div class="htmlview paragraph">The application of computational methods for the development of the whole engine-vehicle system has been evaluated in this paper, to highlight the potential of computer simulation techniques applied to the analysis of engine-vehicle matching.</div> <div class="htmlview paragraph">First, engine performance was simulated using a one-dimensional fluid dynamic code, and predicted data were compared to experimental results, to assess the accuracy of the engine computer model not only as far as gross engine performance parameters are concerned, but also for the prediction of pressure values at several locations inside the engine. The simulation was also extended to the whole engine operating range, including part-load operating conditions.</div> <div class="htmlview paragraph">Afterwards, a vehicle simulation code was employed, to predict vehicle performance and fuel consumption. The vehicle model was validated through a detailed comparison of the computer simulation results with experimental data, including both main acceleration performance and average fuel consumption values over typical driving cycles (ECE, EUDC).</div> <div class="htmlview paragraph">Finally, engine and vehicle simulation techniques were coupled and applied to the analysis of the impact of engine modifications on vehicle performance, and they have been proved to be powerful and effective instruments to identify the modifications required to achieve the vehicle performance targets.</div>