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허동한(Donghan Hur),정지훈(Jihoon Jung),이정준(Jungjun Lee),김석(Seok Kim),이준규(Joonkyu Lee),이주헌(JooHun Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The advanced method of temperature control by physical model has been developed to achieve more stable temperature control while DPF regeneration mode is active. To apply this new control strategy, the exhaust gas temperature has to be precisely modeled at first On the engine side, the combustion efficiency model was constructed using experimental study so that the unburned fuel in cylinder could be estimated under the various conditions. On the catalyst side, the thermodynamic law helped to calculate the exothermic energy from the unburned fuel. And heat transfer and energy equation determined the temperature behavior at both slice and gas side in the channels of the catalyst. Lastly, temperature loss in the pipe between LNT and DPF was modeled by heat equivalent equation. The model based temperature control can be realized by the reverse of the temperature model. The demanded post fuel quantity was calculated from demanded temperature profile inside the catalyst. The accuracy of the new control method was fully validated in various vehicles which are driven in real road.