基于远程数据的重型柴油车实际道路碳排放测算准确度

Accuracy analysis of carbon emissions measurement of heavy heavy-duty diesel vehicles based on remote data

利用车载排放测试系统(PEMS),对3辆加装有车载诊断系统(OBD)远程监控设备的重型柴油车进行实际道路排放测试,以获取车辆实际道路基于电子控制器单元(ECU)的OBD远程油耗数据,分析碳排放结果的准确性及其影响因素.研究发现,基于碳平衡法获取的ECU油耗换算CO_(2)与车载排放测量系统(PEMS)直接测量的CO_(2)排放结果存在差异,二者偏差平均为2.06%.对影响ECU碳排放计算的关键因素(ECU油耗量和ECU行驶距离)的准确性进行了分析,发现ECU油耗的偏差均在3%以内,而ECU测量距离的平均偏差为2.41%.ECU油耗和行驶距离的准确度会受到车速、加速度和整个行程动态的影响.当车辆低速行驶时,其准确度较低.

In order to attain the remote On-board Diagnostics(OBD)fuel consumption data based on the electronic control unit(ECU)at the vehicle real driving conditions and analyze the accuracy of the carbon emission results and its influencing factors,the real driving emissions tests were conducted on 3heavy-duty diesel vehicles equipped with the remote OBD monitoring equipment and the Portable Emissions Measurement System(PEMS).There were some differences between the CO_(2) emission flow rate converted based on ECU fuel consumption rate and the CO_(2) emission flow rate measured by PEMS,and the average deviation was 2.06%.At the same time,the accuracy of the key influencing factors on ECU fuel consumption calculation(ECU fuel consumption and ECU driving distance)was analyzed.The deviation of ECU fuel consumption was within 3%,and the average deviation of driving distance given by ECU was 2.41%.The accuracy of ECU fuel consumption and driving distance was affected by vehicle speed,acceleration and the dynamics of the entire trip.The accuracy was relatively lower at low vehicle speed conditions.