supported by National Nature Science Foundation of China (Grant Nos. 61773009, U1864201, 61703177);Jilin Province Science and Technology Development Plan (Grant Nos. 20180101067JC, 201903021 05GX, JJKH20180144KJ, JJKH20190999KJ)
In urea selective catalytic reduction(urea-SCR) systems, the ammonia coverage ratio is an important parameter for satisfying emission regulations. However, this parameter cannot be directly measured by onboard sensors...