关键词: 牵引车；整车性能；动力性；经济性

Abstract: In order to improve the power and economic performance of a tractor, the whole vehicle simulation model is established by using Cruise software, and the power and economic performance of the prototype vehicle is analyzed. By comparing the test data of competing products, it is found that the car has good power performance but poor economy. By comparing the coasting test data of the prototype vehicle and the competitive vehicle, the driving resistance of the whole vehicle is analyzed. Through computational fluid dynamics (CFD) analysis, the optimization scheme of the top of the cab is proposed to improve the driving resistance of the whole vehicle; The working range of the engine under different rear axle speed ratios is analyzed, and the improvement scheme for optimizing the rear axle speed ratio is put forward according to the customer's demand. The test results show that the optimization scheme is effective, improves the vehicle performance and enhances the product competitiveness.

Key words: Tractor; Vehicle performance; Power; Economy