中国轻型车测试工况分析及对油耗的影响

Study on the Difference of Test Cycles and Its Influence on Fuel Consumption of Chinese Light-Duty Vehicle

为了揭示中国轻型车各测试工况的特征,本文研究了NEDC, WLTC, CLTC-P和CLTC-C四种测试工况的差异及对油耗的影响。研究结果表明:NEDC对巡航工况考察权重较大,驾驶激烈程度最低;WLTC侧重对高速工况的加、减速工况的考察,驾驶最为激烈;CLTC-P和CLTC-C对怠速、匀速及加、减速工况的考察相对均衡,驾驶激烈程度介于NEDC和WLTC之间,且CLTC-P略大于CLTC-C工况。对于轻型汽油车,NEDC切换到WLTC后油耗平均恶化12%左右,切换到CLTC-P和CLTC-C后油耗平均分别恶化14%和10%左右。对于轻型柴油车,NEDC切换为WLTC工况后油耗平均恶化10%左右,切换到CLTC后油耗变化不明显。

The differences of NEDC, WLTC, CLTC-P and CLTC-C driving cycles and their influences on fuel consumption were studied, which to reveal the characteristics of different driving cycles of Chinese light-duty vehicles. The results show that NEDC has a large weight on cruising mode and the driving intensity is the lowest. WLTC focuses on acceleration and deceleration at high speed, and driving is the most intense. CLTC-p and CLTC-C are relatively balanced in idle speed, uniform speed, acceleration and deceleration conditions, and the driving intensity is between NEDC and WLTC, however, CLTC-P was greater than that of CLTC-C. For light-duty gasoline vehicles, fuel consumption deteriorates by about 12% on average after switching from NEDC to WLTC, 14% and 10% on average after switching to CLTC-P and CLTC-C, respectively. For light-duty diesel vehicles, fuel consumption deteriorates by about 10% on average after NEDC switches to WLTC mode, while fuel consumption does not change significantly after switching to CLTC.