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International Journal of Automotive Technology > Volume 12(2); 2011 > Article
International Journal of Automotive Technology 2011;12(2): 173-182.
MODEL-BASED DESIGN OF A VARIABLE NOZZLE TURBOCHARGER CONTROLLER
H. G. ZHANG1, E. H. WANG1, B. Y. FAN1, M. G. OUYANG2, S. Z. XIA2
1Beijing University of Technology
2Tsinghua University
ABSTRACT
Variable Nozzle Turbocharger (VNT) was invented to solve the problem of matching an ordinary turbocharger with an engine. VNT can harness exhaust energy more efficiently, enhance intake airflow response and reduce engine emissions, especially during transient operating conditions. The difficulty of VNT control lies in how to regulate the position of the nozzle at different engine working conditions. The control strategy designed in this study is a combination of a closedloop feedback controller and an open-loop feed-forward controller. The gain-scheduled proportional-integral-derivative (PID) controller was implemented as the feedback controller to overcome the nonlinear characteristic. As it is difficult to tune the parameters of the gain-scheduled PID controller on an engine test bench, system identification was used to identify the plant model properties at different working points for a WP10 diesel engine on the test bench. The PID controller parameters were calculated based on the identified first-order-plus?dead-time (FOPDT) plant model. The joint simulation of the controller and the plant model was performed in Matlab/Simulink. The time-domain and frequency-domain performances of the entire system were evaluated. The designed VNT control system was verified with engine tests. The results indicated that the real boosting pressure traced the target boosting pressure well at different working conditions.
Key Words: Variable nozzle turbocharger, System identification, PID controller design, Modeling, Diesel engine
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