Reductant Tank Sensor Diagnostic Method and System

The invention relates to a reductant tank sensor diagnostic method and system. The system for diagnosing a sensor of an exhaust aftertreatment system may include receiving a first tank level value from a sensor. A plurality of reductant dosing command values over a period of time are received. A dosed reductant value is determined responsive to the plurality of reductant dosing command values reaching a threshold integrated value. A second tank level value is received from the sensor responsive to the dosed reductant value reaching the threshold integrated value. A sensor-estimated dosing value is determined based on the difference between the first tank level value and the second tank level value. The sensor may be diagnosed as performing outside of an acceptable calibration range based on the difference between the sensor-estimated dosing value and the dosed reductant value. 本发明涉及还原剂罐的传感器诊断的方法和系统。诊断排气后处理系统的传感器的系统可以包括从传感器接收第罐内液面高度值。接收段时间内的多个还原剂定量配给要求值。响应于多个还原剂定量配给要求值达到阈值累计值而确定定量配给的还原剂值。响应于定量配给的还原剂值达到阈值累计值，从传