Selection of different strategies of exhaust gas thermal management for optimum fuel economy. 2020-28-0339
To tackle the problem arising due to emissions and to reduce them, complex after-treatment system is used. For efficient working of the after treatment system it must operate at sufficient high temperature even at low loads for better conversion efficiency. Also, there is different temperature requirements for different catalyst used in SCR (Selective catalyst reduction) system. For this, various on engine strategies are implemented on modern diesel engines such as multiple fuel injection, late fuel injection, high injection pressure and exhaust gas recirculation. Thermal management is an operating condition which must be triggered when there is need of elevated temperatures for efficient functioning of the after treatment system. Thermal management includes SCR thermal management and regeneration. The process of removing deposits from after treatment system is known as regeneration. Less work has been done of exhaust gas thermal management considering BSFC (Brake specific fuel consumption). The research paper gives idea about different exhaust gas thermal management strategies that can be used which will give lower BSFC. The different experiments of exhaust gas thermal management include multiple pulse injection (2 pulse, 3 pulse and 4 pulse) with exhaust throttle valve actuation for achieving required exhaust gas temperature, Experiments also include exhaust gas thermal management by different catalyst used in SCR and their comparison based on BSFC.