摘要：This study describes a Cu-based selective cata-lytic reduction (SCR)model, which considers tem-perature, ammonia storage, and space velocity. An ammonia loss factor is proposed, and a specific al-gorithm is given. The ammonia loss factor is used to correct the ammonia storage and nitrogen oxide (NO,)conversion efficiency. The model is tested on a test bench under the World Harmonized Transient Cycle (WHTC) and the World Harmonized Station-ary Cycle (WHSC), and the model is tested on a ve-hicle for urban, suburban, and high-speed road con-ditions. The results show that under the WHTC, the cumulative deviation between the NO,conversion efficiency predicted by the model and the NO, con-version efficiency calculated by the sensor is-0.2%;under the WHSC, the cumulative deviation between the two is-0.41%; and under vehicle conditions, the cumulative deviation between the two is 0.36%.A new finding in this study is that for the monolithic catalyst, the ammonia loss factor and the NOx con-version efficiency corresponding to the rising phase and the falling phase of ammonia storage are not co-incident. These new insights can optimize the control strategy of automotive SCR.
关键词：SCR;ammonia storage;ammonia loss factor;NO;diesel;monolithic catalyst
