Experimental research of fuel consumption performance of light-duty diesel vehicles under typical condition

• 1、Key Laboratory for Automotive Transportation Safety Enhancement Technology of the Ministry of Communication, Chang′an University, Xi’an 710064, China
• 2、Department of Automotive Engineering, Shaanxi College of Communication Technology, Xi’an 710018, China

Abstract：In order to establish fuel consumption model for traveling vehicles, a mainstream light-duty diesel vehicle was studied in this paper to collect data including containing speed, time and fuel consumption rate based on controlled-road test through on-vehicle fuel consumption system. Vehicle fuel consumption characteristic equations were obtained by regression analysis. Analysis showed that the low to high order of instantaneous fuel consumption of light-duty diesel vehicles is engine brake downhill, forced idle sliding condition on level road, engine braking downhill condition, free idle condition, constant speed condition, full throttle acceleration uphill condition, and full throttle acceleration on level roads. At the same time, instantaneous fuel consumption of forced idle sliding condition is much lower than that of the free idle sliding condition. In addition, the model of the transient fuel consumption about light-duty diesel vehicles established using road test data through regression analysis has the advantages of good economy and low cost, which also can provide reference and data for further study on the actual operation fuel consumption of light-duty diesel vehicles.

Keywords： Light-duty diesel vehicles fuel consumption performance automotive engineering road test regression analysis