Abstract
Abstract In the last decades the role of the engine control has became fundamental to improve fuel consumption and comply with the emissions standards. Particularly on automotive Diesel engines sophisticated control systems have been introduced, which are based on both large measurement data sets and complex controllers. Alternatives are needed to simplify and improve the Engine Management System (EMS). To this purpose the in-cylinder signal may be an effective measure to enhance EMS and its reliability, as well as to potentially reduce both costs and development time. The paper deals with the development of two techniques to estimate the Air-Fuel Ratio (AFR) and the in-cylinder mass from the in-cylinder pressure signal. These methodologies are intended to be implemented in real-time with the aim of replacing or working jointly with the existing air mass flow and lambda sensors. The techniques were validated vs. experimental data measured at the engine test bench on a Common Rail light-duty Diesel engine. The results show a good accuracy in predicting Air-Fuel Ratio and in-cylinder mass in a wide engine operating range.
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