耿磊^1,3， 袁志玲^2,3， 王奉双^1,3， 王军^1,3， 王孝莉^1,3

(1.潍柴动力空气净化科技有限公司，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061；3.内燃机可靠性国家重点实验室，山东 潍坊 261061)

摘要：为了研究尿素对碳平衡的影响，在WP7发动机上进行常规ESC和ETC排放试验。试验结果分析表明，喷尿素ESC测试循环对碳平衡造成0.49%的偏差，喷尿素ETC测试循环对碳平衡造成0.42%的偏差。并且，尿素量越多影响越大。提出一种方法，对计算油耗量进行适当修正可提高判定发动机测试系统的准确性。

关键词：柴油机；碳平衡；燃油消耗量；尿素；测试系统

Abstract：ESC and ETC toutine tests on a WP7 engine were conducted in order to study the impact of urea on carbon balance. The results showed that, urea injection ESC test cycle caused 0.49% deviation of carbon balance, the injection of urea ETC cycle test caused 0.42% deviation of carbon balance. More urea resulted in greater impact. A method was proposed to provide appropriate amendments to calculate fuel consumption which can increase the accuracy of engine systems test.

Key words：diesel engine; carbon balance; fuel consumption;urea;test systems