Research on Parameter Matching and Control Strategy of Electric Semi trailer Power System

Reducing carbon emissions is an important issue for environmental protection, while also saving fossil fuels for all mankind and preventing global warming. Therefore, reducing carbon emissions is of great significance. The carbon emissions in the transportation sector account for an important proportion of global carbon emissions, and the carbon emissions of heavy-duty commercial vehicles also account for an important proportion of the carbon emissions in the transportation sector. Therefore, the electrification of heavy-duty commercial vehicles is one of the important ways to save energy and reduce emissions for heavy-duty vehicles. Especially the research topic of this article: semi-trailer trains. Similar to passenger cars, semi-trailer trains also have two electrification ideas: hybrid and electric drive. Considering the high energy demand of heavy-duty commercial vehicles, the high cost of large capacity batteries, the current low level of development of electric heavy-duty commercial vehicles, the low subjective acceptance of users, and the fact that most existing models in the market are fuel driven, this article proposes a "distributed hybrid semi-trailer train" for hybrid semi-trailer trains. The tractor is still a traditional internal combustion engine driven tractor. The semi-trailer is an electric semi-trailer equipped with battery motor electronic control. The VCU of the tractor stores the control program for the hybrid tractor semi-trailer and generates control signals for the semi-trailer based on the operating conditions. Electric semi-trailer can assist in driving or braking. In the market environment where internal combustion engine driven semi-trailer trains are the mainstream, this scheme proposes a low-cost and adaptable method that can quickly promote the conversion of existing fuel commercial vehicles into hybrid commercial vehicles. This article establishes a hybrid tractor semi-trailer model in the joint simulation environment of Matlab/Simulink and TruckSim, and calculates the electric motor parameters of the electric semi-trailer based on the existing tractor power system parameters. Drive control algorithm and brake control algorithm were established separately in the VCU module. The driving control algorithm adopts ECMS to dynamically adjust the output torque of the semi-trailer according to the working conditions. The braking control algorithm provides the braking torque of the semi-trailer based on the operating conditions. Taking CHTC-TT operating conditions as the optimization objective, genetic algorithm is used to optimize the key parameters of ECMS. The results indicate that significant cost savings can still be achieved while maintaining the available rate of SOC decrease.