基于Vmas的碳平衡法汽车油耗测量误差影响分析

Research on Influencing Factors on Errors of Vehicle Fuel Consumption Measured by Carbon Balance Method Based on Vmas

介绍基于VMAS的碳平衡法汽车油耗测量方法。根据测量原理和测量系统构成,将汽车油耗测量结果影响因素分为气体浓度测量、流量测量、燃油品质、设备同步性和车况对其进行分析。在稳定工况下,通过实车试验数据分析各影响因素引起的油耗测量误差。试验证明,稀释氧和二氧化碳浓度测量传感器精度需进一步提高,超声波涡街流量传感器精度不能满足油耗检测系统的要求,在稳定工况下检测系统中设备同步性对检测结果的影响较小等。指出为提高油耗测量准确度,油耗测量系统中需要改进的地方。

Vehicle fuel consumption measurement using carbon balance method based on Vmas was introduced.The influencing factors of fuel consumption measuring result,including gas concentration measurement,flux measurement,quality of fuel,equipment synchrony and vehicle condition,were analyzed according to the measure theory and structure of measuring system.Analysis of the errors caused by these influencing factors was performed based on the field experimental data obtained under steady test condition.The experiment shows that（1） precision of carbon dioxide sensor and oxygen sensor need to be improved;（2） ultrasonic vortex flowmeter cannot satisfy the requirement of the fuel consumption measuring system;（3） equipment synchrony of measuring system has little influence on measuring result under steady condition.The problems of the measuring system which need to be solved were pointed out for improving the fuel consumption measuring precision.