柴油车非循环工况NO_x排放评价方法研究

通过对传统车用柴油机排放评价方法和非工况排放评价方法分析,提出了一种柴油机非工况循环排放评价方法。该方法通过对试验用柴油机选择性催化还原器(SCR)进行台架试验,将制取所得的催化后功基排放强度脉谱作为前馈,结合车辆运行中实时工况点分布,进行道路车辆实时运行工况排放数据的计算,实现可不依赖于移动式排放测试设备(PEMS)的道路车辆实际排放量实时估算。详细介绍了台架试验制取氮氧化物(NOx)功基排放强度前馈脉谱的全过程,并以区域达标法(NTE)为例对实车进行了道路NOx排放预测,验证本方法的可行性及在车辆实际排放控制和监测中的优势。同时识别出了现有NTE法或功基窗口法并不覆盖车辆实际运行的高排放区域,为相关部门对车辆的实时排放情况监管提供一种新的技术选择。

Research on the Diesel Vehicle off-Cycle NOx Emission Evaluation Method

Research on evaluation of diesel vehicle off-cycle NOx emissions comparing with the traditional emission evaluation method for vehicle diesel engines, an off-cycle NOx emission evaluation method was proposed. According to the test-bed measurement of the work-based emission intensity map of a diesel engine with a SCR system coupled to the distribution of the real-time operating conditions of the vehicles. The calculation of the emission data of the road vehicle under real-time operating conditions was performed, thus realizing the estimation of the real-time emissions from the road vehicle without using portable emissions monitoring system(PEMS), In addition, the whole process of testing NOx work-based emission intensity map on the test bed was also introduced in detail, and the on-road NOx emission prediction of in-use vehicles was conducted based on the NTE method, while verified the feasibility of this method and the advantages of monitoring the actual emissions from vehicles. At the same time, it also pointed out that the existing NTE method or work base window method could not cover the high emission area in which the vehicle actually operated. This method provides a new technology choice for the relevant regulating agencies to monitor the real-time emissions of vehicles.