Design of Robust Smith Predictor for Diesel EGR Based on UEGO
Liu Ruixiang Gao Xiyan(1. College of Traffic and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China; 2. The Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China)
On the foundation of the EGR system model, a digital controller for the EGR system is designed using frequency-domain technique. Since the model includes time delay, a Smith predictor control scheme is used. Engine tests show that the Smith predictor can control the air-fuel ratio in an accurate range and it is robust when the model parameters change.