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International Journal of Automotive Technology > Volume 18(4); 2017 > Article
International Journal of Automotive Technology 2017;18(4): 579-587.
doi: https://doi.org/10.1007/s12239-017-0058-9
GAIN-SCHEDULED EGR CONTROL ALGORITHM FOR LIGHT-DUTY DIESEL ENGINES WITH STATIC-GAIN PARAMETER MODELING
Inseok Park1, Seungwoo Hong1, Myoungho Sunwoo3
1Hyundai Motor Group
3Hanyang University
ABSTRACT
This paper presents a model-based gain scheduling algorithm of a PI-based EGR controller for light-duty diesel engines. In order to capture nonlinear characteristic of the EGR system, we have proposed a new scheduling variable to illustrate the static-gain of the plant model as a linear function. The proposed scheduling variable is composed of the air-tofuel ratio of the exhaust gas and the pressure ratio between the exhaust and intake manifolds. Using the scheduling variable, a static-gain model achieved 0.94 of the R-squared value with 810 of steady-state measurements which include key engine operating conditions. Based on the model of the static-gain parameter, the gains of the PI controller are decided by Skogestad internal model control (SIMC) tuning rule in real-time. Through various scenarios of engine experiments, the proposed gain scheduling algorithm represented that the PI gains were successfully adapted according to the changes of the engine operating conditions.
Key Words: Diesel engine, Exhaust gas recirculation, Variable geometry turbocharger, Skogestad internal model control, Linear parameter varying, Gain scheduling
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