摘要：This paper investigates options to complement a diesel engine airpath feedbackcontroller with a feedforward. The control objective is to track the intake manifold pressureand exhaust gas recirculation(EGR) rate targets by manipulating the EGR valve and variablegeometry turbine (VGT) while satisfying state and input constraints. The feedback controller isbased on rate-based Model Predictive Control (MPC) that provides integral action for tracking.T'wo options for the feedforward are considered one based on a look-up table that specifiesthe feedforward as a function of engine speed and fuel injection rate，and another one basedon a(non-rate-based) MPC that generates dynamic feedforward trajectories. The controllersare designed and verified using a high-fidelity engine model in GT-Power and exploit a low-order rate-based linear parameter-varying (LPV) model for prediction which is identified fromtransient response data generated by the GT-Power model. It is shown that the combination offeedforward and feedback MPC has the potential to improve the performance and robustness ofthe control design. In particular, the feedback MPC without feedforward can lose stability at lowengine speeds, while MPC-based feedforward results in the best transient response. Mechanismsby which feedforward is able to assist in stabilization and improve performance are discussed.
关键词：Model predictive control;Linear parameter-varying control;Diesel airpath control
