Idle Mode Control on a Combustion Engine Test Bench via Internal Model Control

In this paper output regulation is applied to the idle mode simulation on combustion engine test benches. This operating mode is for tuning the parameters of the idle speed controller of the combustion engine. Therefore the engine load torque has to be regulated to zero. The main challenge thereby concerns the combustion oscillations which in this paper are modeled as a parameter dependent exosystem whose parameter is not constant but related to the mean value engine speed which is a quantity that in steady state can be calculated. It is further discussed how to apply an internal model based approach to compensate the combustion oscillations. For fast convergence of the control approach a constructive method to achieve a fast converging internal model is presented. Due to the parameter depending exosystem the internal model will be parameter dependent too. For this LPV system a H-inf LPV stabilizer is applied. At the end the method is tested and validated on a combustion engine test bench simulator.