Abstract
The chassis dynamometer and PEMS test implemented on a heavy-duty vehicle,through comparing the working condition, fuel consumption and emissions result,it showed that the engine working area in PEMS test occupy most of the working area under the engine performance curve from 1300r/min to 2500r/min at the medium load. In the C-WTVC cycle the engine usually worked below 1900r/min at medium and heavy load.Thus in PEMS test the fuel consumption and pollutant emissions are higher than them in C-WTVC test,the fuel consumption is 12.54L/100km which is 9.3% higher, the brake specific emission of NOx,PN,CO are 91.0%,38.7% ,78.9% higher respectively.The PEMS test is more practical and convenient for heavy-duty vehicle emission test while has a poor measurement repeatability under the influence of different road conditions.The C-WTVC test cycle has a good measurement repeatability for its fixed condition.
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