COMPARISON OF EGR-VTG CONTROL SCHEMES FOR AN EPA2010 HEAVY-DUTY DIESEL ENGINE

摘要

Next generation heavy-duty diesel engines require tight airrnpath control to meet upcoming emission legislation withrnminimal fuel consumption. This study concentrates on thernemission control of a 13l, 360 kW EGR diesel engine,rnwhich is compliant with EPA2010 emission targets. Currently,rnan input-decoupled controller design is often appliedrnfor EGR-VTG control. The performance of such a state-ofthe-rnart controller is compared with an SVD-decoupled controlrndesign and time optimal control. All three controllersrnuse a newly introduced control parameter: exhaust oxygenrnconcentration. For disturbances around an engine operatingrnpoint, the performance of these controllers is evaluatedrnfrom simulation results. Especially, settling time and NO_xrnand PM emissions are of interest. A comparison is presentedrnwhich shows that SVD-decoupled control will givernimprovements over input decoupled control in terms of performancernand simplicity. Time optimal control shows thatrnfurther improvements of settling times are possible, but thernrequired large control inputs will have a significant effectrnon the produced torque.