Study On Longitudinal Platooning Control And Fuel-saving Strategy Of Commercial Vehicles

With the increase of freight volume year by year,there are new opportunities for highway transportation,but also more challenges.Extreme energy consumption and increasingly serious environmental issues have a lot of attention.The highway transportation industry as one of the main sources,the work of fuel-saving and emission reduction is duty-bound.In recent years,commercial vehicle platooning technology has provided new fuel-saving means for highway transportation.Due to the long operation time,complicated driving conditions and larger fuel consumption,this technology has great potential and practical significance.To solve the Eco-driving problems of platooning commercial vehicles,the studies are as follows:(1)With the project of FAW(First Auto Works)Technology Center,the experimental data driving 3.5×10~4 km by the 12-gears commercial vehicles were statistically analyzed.The power transmission system model,driving system model and aerodynamics model were established.The common gear usage and the spatial distribution of each gear were obtained.The economic speed range,engine torque model and fuel consumption model of experimental commercial vehicle were determined.The driving data of 560 segments uphill conditions were extracted.These provided the basic theory and data support for the following work.(2)Under the condition of flat road,the adaptive fuzzy control structure of platooning trucks in the process of starting and steady driving was constructed.Based on the gearshift rule of 12-gears commercial vehicle and the gear information,the adaptive control effect was verified and the safety performance under emergency braking condition was analyzed by using the Co-simulation method in Truck Sim.(3)For the uphill section,which has the more influence on the fuel economy of commercial vehicle,the uphill model based on piecewise affine function and the prediction model of uphill-driving behavior were established.The convex optimization of uphill model space was carried out by using Explicit Model Predictive Control(EMPC)algorithm.Based on the economic speed,the fuel-saving driving control was studied.(4)The fuel economy analysis of flat road condition and uphill road condition were carried out respectively.In the flat road condition,the minimum safe driving distance was taken as the fuel-saving strategy,and the fuel economy of platooning trucks was determined by the aerodynamics analysis method based on particle and meshless technology.In uphill road condition,fuel economy is mainly reflected in the uphill speed optimization and tracking.Therefore,based on fuel consumption model of experimental vehicle,the fuel consumption of uphill road condition was compared with the optimized speed predicted by EMPC model and the cruise control speed.In summary,the longitudinal platooning control method of commercial vehicles designed and developed in this paper can adaptive control the trucks to complete the stable and reliable platooning according to the road condition information,and shows better fuel-saving effect.It provides a new thought for the implementation of the platooning technology in the future.