This study conducts experimental research on the emission characteristics of carbon monoxide(CO),nitrogen oxides(NOx),and particulate matter quantity above 10nm(PN10)of heavy-duty vehicles withr different loads under low load cycle(LLC).The results were obtained:under LLC operating conditions,the to-tal emissions of CO increase with the increase of load,but the emissions per unit power is opposite.The emis-sions of NOx decreases with increasing loads under LLC operating conditions.Both PN10 and PN23 increase with increasing load,and the larger the load,the higher the proportion of particles with a size of 10-23nm.
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