刘悦锋，臧硕勋，孟令军，李立超，赵文辅

（中国第一汽车股份有限公司技术中心，吉林 长春 130011）

    摘要：本文介绍了WHTC排放测试循环的背景，以一台3.8L柴油机为试验样机，对其运行WHTC循环以及现行国标GB17691-2005中的欧洲瞬态排放测试循环（ETC）的试验工况进行了对比分析，通过对测试工况的转速、扭矩分布状况，后处理排气温度分析，来为排放控制策略的制定探索可行的方向。本文基于试验样机对进气节流、排气节流，从进排气的方面措施对发动机排气温度的影响进行分析。

    主题词：柴油机；WHTC循环；排气温度；NO_X；SCR 催化转化器；进气节流；排气节流

    Abstract：In this paper, the background of the WHTC emission test cycle was introduced, and a 3.8L diesel engine was tested to compare and analyse the WHTC cycle and the European Transient emission test Cycle (ETC) of the current GB17691-2005 in China. Through the analysis of the engine rotational speed, torque distribution and post - treatment exhaust temperature, the feasible direction of the emission control strategy was provided. The effects of intake throttle and exhaust throttle on the engine exhaust temperature were analyzed.

    Key Words: Diesel；WHTC；Exhaust Temperature；NO_X；SCR；Catalyst；Meter-in；Meter-out