Abstract: In order to study the performance of the diesel engine aftertreatment system, this paper builds a diesel engine aftertreatment test bench based on China V| standard, and adopts the aftertreatment technology route with diesel oxidation catalyst(DOC), diesel particulate filter(DPF), selective catalytic reduction(SCR) and ammonia slip catalyst(ASC). The test first corrected the temperature and $ NO_{x} $ sensor deviation in the aftertreatment bench, which improved the accuracy of the test. Then, the relationship between engine power and emission performance was explored through experiments, and the relationship between temperature, $ NH_{3} $ storage capacity and $ NO_{x} $ conversion rate at a certain exhaust gas flow was studied. The results show that when the engine is at the maximum torque point, the exhaust gas temperature and fuel consumption rate reach the maximum, and the emission performance is poor; the $ NO_{x} $ conversion rate increases with the increase of $ NH_{3} $ storage, and the $ NH_{3} $ storage decreases with the increase of temperature. In addition, the influence of the DPF carrier coating on the aftertreatment performance was explored, and it is shown that the carrier with an alkali metal coating has little effect on the engine emission performance.
Keywords: aftertreatment system; engine power performance; $ NO_{x} $ conversion rate; $ NH_{3} $ storage capacity; coating
合肥工业大学学报自科版