Passenger car diesel engine; Exhaust gas recirculation; Variable geometry turbocharger; Linear parameter-varying; Gain scheduling; Quantitative feedback theory; 승용디젤엔진; 배기가스 재순환; 가변용량 터보차저; 선형 파라미터 변이; 게인 스케줄링; 정량적 피드백 이론
한국자동차공학회 논문집, v. 23, NO 1, Page. 56-64
This study presents a model-based gain scheduling strategy for PI-based EGR controllers. The air-to-fuelratio is used as an indirect measurement of the EGR rate. In order to cope with the nonlinearity and parameter varyingcharacteristics of the EGR system, we proposed a static gain model of the EGR system using a new scheduling parameter.
With the 810 steady-state measurements, the static gain model achieved 0.94 of R-squared value. Based on the staticgain of the EGR system, the PI gains were robustly designed using quantitative feedback theory. Consequently, thegains of the PI controller are scheduled according to the static gain parameter of the EGR path in runtime. The proposedmodel-based gain scheduling strategy was validated through various operating conditions of engine experiments suchas setpoint step responses and disturbance rejections.