Abstract
In order to make modern Diesel engines cleaner and more fuel efficient, their air systems architecture become more and more complex. The control strategies of these systems must take account of the multiple components interactions with minimal calibration effort required. In this context, model based techniques are very attractive. In this paper, we propose a control oriented model of a variable geometry turbocharger in an architecture with two Exhaust Gas Recirculation (EGR) loops: High Pressure (HP) and Low Pressure (LP). This model is implemented in a basic control strategy and evaluated experimentally during tests with LP or HP EGR. The results show that the choice of EGR circuit has a high influence on the turbocharger actuator position, but that this effect is well taken into account in the proposed model.
Highlights
1.1 MotivationIn the automotive industry, the necessary reduction of pollutant emissions involves drastic evolution of engines, and in particular Diesel engines
Two types of Exhaust Gas Recirculation (EGR) systems have been investigated: High Pressure (HP) and Low Pressure (LP) systems, named after their position on the air system with respect to the turbocharger. When both systems are combined, the operating conditions of the turbochargers are highly dependent on the use of either of these two systems. This must be taken into account in the turbocharger control strategy which determines the Variable Geometry Turbocharger (VGT) position corresponding to a required pressure at the outlet of the compressor
Load transient tests at constant speed have been performed in HP or LP EGR configurations
Summary
1.1 MotivationIn the automotive industry, the necessary reduction of pollutant emissions involves drastic evolution of engines, and in particular Diesel engines. Exhaust Gas Recirculation (EGR) and turbocharging have been the major evolution of Diesel engines in the recent past. They allow to increase the quantity of burned gas in the intake manifold, which helps reducing the NOx production during the combustion. Two types of EGR systems have been investigated: High Pressure (HP) and Low Pressure (LP) systems, named after their position on the air system with respect to the turbocharger. When both systems are combined, the operating conditions of the turbochargers are highly dependent on the use of either of these two systems. This must be taken into account in the turbocharger control strategy which determines the Variable Geometry Turbocharger (VGT) position corresponding to a required pressure at the outlet of the compressor
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