Impact of EGR on Turbocharger Control on a Diesel Engine with two EGR loops

This paper considers a Diesel engine fitted with a variable geometry turbocharger and two EGR circuits. It describes how a turbocharger control strategy based on motion planning and feedback linearization can take account of the impact of exhaust gas recirculation (EGR) on the system. The analysis of the system trajectories of a reduced model shows that the EGR has a deep impact on the operating range of the turbocharger. This effect can be introduced at the same time as a constraint in the trajectory and in the inversion of the reduced model. Experimental results demonstrate the efficiency of this strategy.