Online detecting method and device of SCR urea nozzle faults
The technology of a urea nozzle and a detection method is applied to the electronic control of the exhaust gas treatment device, the diagnosis device of the exhaust gas treatment device, the exhaust gas treatment and other directions, which can solve the problems of urea leakage and crystallization, reduce the crystallization phenomenon and improve the reliability. Effect
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[0042] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.
[0043] Explanation of terms involved in the present invention:
[0044] NOx: Nitrogen oxide compounds, mainly including nitric oxide NO and nitrogen dioxide NO2.
[0045] SCR: Selective catalytic reduction system, which uses urea to decompose to produce ammonia. Under the action of a catalyst, ammonia reacts with NOx to reduce NOx emissions.
[0046] EEPROM: The area in the ECU used to store certain variables after power-off. The variables stored in this area can be read from the last stored value after power-on.
[0047] NH3: Ammonia, the input of the SCR system is used to reduce NOx, which is toxic, and the emission regulations are strictly controlled.
[0048] NOx sensor: a sensor that can test real-time NOx concent...
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