Device for reducing NOx emission of diesel engine and control method

The invention discloses a device for reducing NOx emission of a diesel engine and a control method, and relates to tail gas aftertreatment, a combustor is additionally arranged at an outlet of a supercharger, the diesel oil consumption of the combustor is analyzed and calculated according to a catalytic temperature demand value of SCR, and equivalent diesel oil is injected into the combustor for combustion according to the diesel oil consumption. Heat is generated, so that the actual temperature of the SCR reaches a catalytic temperature required value. The purpose of reducing hidden dangers such as in-cylinder negative pressure rise and engine oil consumption increase caused by use of the throttle valve is achieved, meanwhile, the influence caused by T6 model temperature hysteresis is reduced, and the risk that NOx emissions of a diesel engine are increased due to SCR temperature reduction caused by burner faults is reduced. 本发明公开了一种降低柴油发动机NOx排放的装置和控制方法，涉及尾气后处理，在增压器的出口处增设一燃烧器，根据SCR的催化温度需求值分析计算出燃烧器的柴油用量，并根据所述