Ammonia leakage reason judgment method and device, ammonia leakage reason correction method and device and storage medium

The invention belongs to the technical field of engine post-processing systems, and discloses an ammonia leakage reason judgment method which comprises the following steps: detecting ammonia leakage of tail gas emission; judging whether the ammonia storage initial value read at the beginning of the driving cycle is 0 or not; if the ammonia storage initial value is 0, further reading the total duration after the vehicle is started in the driving cycle, and judging whether the total duration after the vehicle is started is smaller than a preset value A or not; and if the total duration after the vehicle is started is smaller than a preset value A, it is judged that the storage of the ammonia storage value of the ECU is abnormal, and therefore the reason of ammonia leakage is judged. 本发明属于发动机后处理系统的技术领域，公开了一种氨泄漏原因的判断方法，包括：检测尾气排放发生氨泄漏；判断本次驾驶循环开始时读取的氨储初始值是否为0；若所述氨储初始值为0，则进一步读取本次驾驶循环内的车辆启动后的总时长，判断所述车辆启动后的总时长是否小于预设值A；若所述车辆启动后的总时长小于预设值A，则判定ECU的氨储值存储异常，从而对氨泄漏的原因进行判断。