陈香春1,2，高慎勇1,2，高莹1,2，吕晓惠1,2，张凌宏1,2

1.内燃机可靠性国家重点实验室，山东潍坊261061；2.潍柴动力股份有限公司，山东潍坊261061

摘要：通过理论分析和试验验证，研究增大压缩比对国六增压柴油机不同负荷工况点燃油消耗率的影响规律和对后处理系统性能的影响。结果表明:增大压缩比可降低柴油机的燃油消耗率；在使用进气节流阀导致进气管压力低于环境压力的情况下，能够提供足够高的缸内压缩压力，但同时会导致排气温度降低，影响颗粒捕集器再生效率。

关键词：压缩比；国六柴油机；后处理；柴油机性能

Abstract:Through theoretical analysis and experimental verification, the influence of increasing compression ratio on the fuel consumption rate at different load conditions and the performance of aftertreatment system of CHINA Ⅵ turbocharged diesel engine are studied. The results show that increasing the compression ratio can reduce the fuel consumption of diesel engine, especially when the intake pipe pressure is lower than the ambient pressure due to the use of intake throttle valve, it can provide higher compression pressure. But it will reduce the exhaust temperature and affect the regeneration efficiency of particulate filter.

Keywords:compression ratio；CHINA VI diesel engine；exhaust after treatment system，diesel engine performance