Control System Design for Variable Nozzle Turbocharger
Date Published: 2009-06-11
Paper Number:2009-01-1668
DOI: 10.4271/2009-01-1668
Citation:
Wang, E., Xia, S., Ouyang, M., Li, J. et al., "Control System Design for Variable Nozzle Turbocharger," SAE Technical Paper 2009-01-1668, 2009, doi:10.4271/2009-01-1668.
Author(s):
Enhua Wang - Beijing Automotive Technology Center
Shengzhi Xia - Beijing Automotive Technology Center
Minggao Ouyang - Tsinghua Univ.
Jianqiu Li - Tsinghua Univ.
Xihao Li - Tsinghua Univ.
Abstract:
The electronic control system of the variable nozzle turbocharger (VNT) was designed. The actuator is the electro-hydraulic servo proportional solenoid. The signals of the engine pedal position sensor, the engine speed sensor, the boost pressure sensor, the intake air temperature sensor, and the ambient pressure sensor are sampled and filtered. The engine working condition is estimated. The control algorithm was designed as the closed-loop feedback digital PI control together with the open-loop feed forward control. The gain-scheduled PI control method is applied to improve the robustness. The control system was calibrated at the turbocharger test bench and the engine test bench. The results indicate the designed control system has good performance for the boost pressure control under the steady and transient conditions.
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