Nowadays, the alternative internal combustion engines are undergoing increasingly strict emission regulations. For that reason, research in this field is focused on looking for new techniques that allow a reduction in engine emissions. In this way, it is possible to highlight the exhaust gas recirculation technique (EGR), which introduces exhaust gas into the cylinders during the intake process, allowing a reduction in nitrous oxides (NOx).
In this project, a global study of the exhaust gas recirculation process (EGR) in turbocharged diesel engines will be carried out, analysing its influence on achieving the emission limits allowed by the Euro V standards.
Obtaining the parameters that allow the optimization of the EGR management under steady conditions and from system stability and robustness point of view is another important goal of the project. For that reason the limitations in the production of exhaust gas will be taken into account and the engine conditions when the EGR production is optimum will be defined.
The EGR distribution will be studied, by developing numerical tools and experimental methods that allow the quantification of that distribution. After analysing the distribution problem, the optimum lay out of the EGR system will be defined in order to achieve an equitable distribution of the EGR, and the relative benefits obtained will be evaluated from a pollutant reduction point of view.
On the other hand, the EGR process will also be analysed in transient conditions, quantifying the effect of the production of this during load variation or engine speed variations. This analysis will be applied to the particular case of the European Union Emission Test Cycle.
Finally, the control strategies of the turbocharger and the EGR valve will be determined to perform under transient conditions and the effects that these strategies produce under engine performance, specific fuel consumption and pollutant emissions will be evaluated
The conclusions obtained during this project are expected to be able to be applied to design new engines in order to ensure that the emission standards are upheld.
In order to approach the project and to guarantee the attainment of objectives a multidiscipline work group has been created. This group includes UPV people from three complementary fields of knowledge to meet the aims of the project. Firstly, the CMT-Motores Térmicos team, with great experience in the study of the termofluidynamic processes in diesel engines. Secondly, the CPOH team with important knowledge about process control. And finally, the MCREDYA team which will focus on developing mathematical models to predict the flow inside the engines. Every work group count on equipment and facilities specially adapted for the project.
KEYWORDS: Diesel motors, EGR, advanced control, Real Time systems, multivariable control, model predictive control