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International Journal of Automotive Technology > Volume 16(4); 2015 > Article
International Journal of Automotive Technology 2015;16(4): 561-570.
MODEL-BASED FEEDFORWARD CONTROL OF THE VGT IN A DIESEL ENGINE BASED ON EMPIRICAL MODELS OF COMPRESSOR AND TURBINE EFFICIENCIES
Y. PARK1, I. PARK2, K. MIN2, M. SUNWOO1
1Hanyang University
2Hanyang Univ.
ABSTRACT
Current diesel engines commonly employ a variable geometry turbocharger (VGT) to improve drivability and fuel efficiency, and this paper addresses model-based feedforward control of the VGT based on empirical models of compressor and turbine efficiencies to improve transient response. Though compressor and turbine efficiencies affect compressor air flow and turbine power, respectively, it is challenging to understand exactly the compressor and turbine efficiencies in real engines. In order to cope with this problem, we propose empirical models of compressor and turbineefficiencies. The input states are proposed based on maps of the compressor and turbine efficiencies, which are provided by turbocharger manufacturers. Parameters of the efficiency models are identified with 225 data of steady-state engine experiments to reflect engine operating conditions. The proposed compressor and turbine efficiency models were applied to the model-based VGT feedforward control algorithm to verify the effectiveness of the efficiency models. The proposed modelbasedVGT feedforward control algorithm based on the compressor and turbine efficiency models was experimentally verified with 2.2 L common-rail-direct-injection diesel engines.
Key Words: Diesel engine control, Variable geometry turbocharger, Compressor efficiency, Turbine efficiency, Feedforward control
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