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Is there a way to perform NH3 compensation on NOx sensors in a diesel engine?
The NOx sensor can be compensated for the NH3 component by subtracting the NH3 value (NH3CAN) from the NOx value (NOxCAN).
- The NOX value "NOxCAN" of the sensor shows the following sensitivity to NO, NO2 and NH3:
→ ppm(NOx) = NO + 0.9 NO2 + NH3 - The NH3 value "NH3CAN" of the sensor shows the following sensitivity to NO2 and NH3:
→ ppm(NH3) = NH3 + NO2
This results in the following compensation function:
ppm(NOx) - ppm(NH3) = (NO + 0.9 NO2 + NH3) - (NH3 + NO2) = NO -0.1 NO2
