초록 열기/닫기 버튼
The advanced method of temperature control using a physical model has been developed in order to achieve a 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 an experimental study so that the unburned fuel from the cylinder could be estimated for various conditions. On the catalyst side, the thermodynamic law helped calculate the exothermic energy from the unburned fuel. In addition, heat transfer and energy equation are used to determine the temperature behavior at both slice and gas side in the channels of the catalyst. Lastly, heat loss in the pipe between LNT and DPF was modeled by using 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 the demanded temperature profile inside the catalyst. The accuracy of this new control method was fully validated in various vehicles driven on real roads.
키워드열기/닫기 버튼
Diesel engine, DPF, Temperature control, Temperature model, Catalyst model, Model based control
