| 摘要 |
In one implementation of the disclosed technique, a NOx sensor polynomial algorithm is used to discriminate between NOx and ammonia emission. The polynomial algorithm uses the SCR's time constant property to infer the "loading state" of the SCR and estimate both the NOx conversion and quantity of ammonia slip. The polynomial algorithm assesses this by differentially analyzing the upstream and downstream NOx sensor signals through a comparison of the polynomial coefficients. |
