高效空调及怠速起停的循环外油耗测试评价

Off-cycle fuel consumption test and evaluation on high efficiency AC LDVs and on start-stop LDVs

油耗测试的传统规程对高效空调及怠速起停系统等循环外技术的节油能力有所低估。以实验室转鼓加尾气分析仪测试系统测量轻型乘用车(LDV)的油耗,选用适当的具有代表性的行驶状况循环及环境条件组合,可以评价高效空调、怠速起停等循环外技术油耗,与相应的基准作对比即可得出油耗奖励值。测试结果表明空调开启与关闭之间的油耗差别通常20%左右,怠速起停车辆在代表中国城市道路行驶状况循环下的节油表现显著优于NEDC循环的节油结果。通过借鉴国际上的循环外测试评价方法和欧盟Ecoinnovation测试评价方法,结合中国的交通、气温特点,是编制我国四阶段油耗标准循环外技术油耗奖励测试方法的有益手段。

Conventional fuel consumption test procedures and calculations can underestimate the potential real-world benefits of high efficiency air condition systems and startstop systems.This shortcoming can be compensated by utilizing additional representative drive cycles and representative temperature tests.The fuel consumption test results on light duty vehicle(LDV)passenger cars shows that AC fuel consumption can be up to 20 percent of total amount during lab test,and New European Driving Cycle(NEDC)cycle under-represent the fuel savings when compared to the driving cycle representing China city traffic conditions when the start-stop system is activated.While following the way of Off-cycle evaluation/Eco-innovation evaluation and taking account of the character of China traffic and environment temperature,Off-cycle credit evaluation method for high efficiency air condition or start-stop technology can be proposed for China.