Method for obtaining SCR ammonia loss during engine stop and electronic control unit

The embodiment of the invention discloses a method for obtaining SCR ammonia loss during an engine stop. According to the method, the factors influencing the loss of ammonia adsorbed to an SCR carrierduring the stop are fully considered. The factors not only include stop time but also include treatment of oxynitride left in an SCR box after the stop, and SCR temperature. Based on the multiple factors, ammonia carrying capacity consumed by treating the oxynitride left in the SCR box during the engine stop, and the ammonia escape amount occurring in real time and related to the SCR temperatureduring the stop can be obtained. Based on the consumed ammonia carrying capacity and escape amount, the SCR ammonia loss during the engine stop is obtained accurately. In addition, the embodiment of the invention further discloses an electronic control unit. 本申请实施例公开了种获取发动机停机过程中的SCR氨损耗的方法，该方法充分考虑了在停机过程中影响吸附在SCR载体上的氨损耗的因素，该因素不仅包括停机时间，还包括处理停机后残留在SCR箱体内的氮氧化物以及SCR温度。基于该多个因素能够获取到发动机停机过程中的因处理残留在SCR箱体内的氮氧化物而消耗的氨载量以及停机过程中实时发生的、与SC