Abstract
In this paper, a 7.8L heavy-duty diesel engine was selected to run WHSC (World harmonized Steady-State Cycle), Hot and Cold WHTC (World harmonized Transient-State Cycle) and CHTC (China Engine Transient-State Cycle) on the engine test bed. The particle emissions were measured by using a particle counter which can simultaneously measure PN10 (number of particles above 10nm) and PN23 (number of particles above 23nm) and other equipment. The results show that the transient emission of PN10 and PN23 have basically the same trends under different cycles. The brake specific emission of PN10 is 21%-105% higher than that of PN23. The brake specific emission of PN for CHTC is higher than that for WHTC. After weighting of cold and hot cycle, the brake specific emission of PN10 of CHTC is 91.16% higher than that of WHTC, and the brake specific emission of PN23 of CHTC is 154.66% higher than that of WHTC. The correlation coefficient between PM and PN23 is 0.995, while the correlation coefficient between PM and PN10 is 0.895. The correlation between PM emissions and PN23 is stronger.
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