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| Research on SCR Exhaust Flow Model Application |
| DOI： |
| Key Words:SCR control strategy exhaust flow model MAP control mode WHTC test ammonia leak |
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| Abstract:For the SCR control system for heavy duty engines, an exhaust flow mathematical formula for the SCR strategy was deduced based on the theory of mass and energy conservation, and an exhaust flow model was established with the software D2P MotoHawk. Then, steady state and transient engine tests were carried out to verify the model. The results show that in steady state the maximum deviation of the model calculated exhaust flow is 5%, while that of the MAP control is 10%. In the transient state at 1000 r/min the model calculated exhaust flow value has higher precision, and the deviation is within 8%, while that of the MAP control is as high as 18%. Based on the WHTC test, while meeting the emissions regulation, the application of the model greatly reduces ammonia leak by 50% with the average value of only 8×10-6 and also reduces the amount of urea injection by 2%. |
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