Research on the Situation of In-use Consistency of China V Heavy Diesel Vehicles in Shenzhen

Abstract

In order to explore the current status of in-use compliance of China V heavy-duty diesel vehicles in Shenzhen, five China V heavy-duty diesel vehicles were tested for NOX emissions using the LugDown cycle, and CO, NOX, and PM emissions were tested for these vehicles using the Portable Emissions Measurement System (PEMS).The test results showed that all 5 vehicles meet the NOX limit requirements of the LugDown test method, and 2 vehicles exceeded the limit requirements of the PEMS test method. For 3 vehicles below the PEMS test NOX limit, the difference in the average value of the two test methods was 14%-18%, and the median difference was 1%-63%; For the two vehicles that exceeded the PEMS test NOX limit, the average difference was 32%-63%, and the median difference was 81%-127%. For vehicles with higher NOX emissions, the LugDown test was not able to reflect the actual situation of real driving emission well. The particulate emission test results showed that the difference in the removal efficiency of different diesel particulate filter could reach more than 113 times, and the difference in the technology of cleaning in engine could reach more than 6 times. The study showed that the current status of compliance of in-use China V standard heavy-duty diesel vehicles was not optimistic.