Topology Optimization And Experimental Testing Of Commercial Vehicle Thermoelectric Modules Based On Real-time Inspection

In recent years,using thermoelectric power generation technology to recycle the heat of automotive exhaust has been highly valued by researchers in various countries.In the thermoelectric power generation system,the topological structure between thermoelectric devices is one of the key factors that affect the electrical performance of the system.This paper starts from the direction of finding the optimal topological structure of thermoelectric modules,conducts theoretical research and experimental analysis on the connection modes of series-parallel circuit between thermoelectric modules,and builds a test bench for automobile exhaust thermoelectric power generation system,conducts electrical performance experiments on thermoelectric modules.In order to improve the conversion efficiency of the automotive exhaust thermoelectric power generation system,the optimal thermoelectric module power collection scheme is sought.The main research results of this paper are as follows:The basic principle of thermoelectric power generation technology is expounded,and the basic performance of the thermoelectric material is briefly introduced.On this basis,the structure and electrical performance of the thermoelectric device are summarized and analyzed.The structure design of the commercial vehicle thermoelectric power plant is completed,which includes the thermoelectric gas box,the thermoelectric device and the coolant channel.Using the self-designed test platform of single heat electrical parts,the power generation of Bi₂Te₃ devices under different pressing forces and different temperature fields is tested.The electrical performance characteristics of the thermoelectric device are verified.The layout and number of the thermoelectric device group are completed and the equivalent mathematical model of the thermoelectric device is established.On this basis,the experimental conditions and methods for topology optimization are analyzed:Taking the maximum peak output power of the thermoelectric device group as the optimization objective,we use the progressive optimality algorithm and the experimental test comparison research to complete the topology design.In order to measure and monitor the working state of each thermoelectric device,a complete single chip voltage real-time inspection system for thermoelectric power generation is designed.Combined with the practical application environment,this paper has completed the hardware design and software compilation of the patrol system,and has realized the real-time acquisition of the 306 thermoelectric modules in the thermoelectric power generation system.The experimental bench of thermoelectric power generation system is set up,and the mathematical model of thermoelectric module resistance is carried out on the basis of real-time inspection data.The output characteristics of the thermoelectric device on the surface of the air box are studied and verified by the method of experimental test.Experimental verification of the topology optimization structure on the experimental bench of the thermoelectric power generation system is carried out:By comparing and analyzing the overall generation capacity of the system under the topology optimization structure and the full series structure,we find that under the topology optimization of the thermoelectric module proposed in this paper,the maximum output power of the thermoelectric power generation device can be increased by nearly 9.4%.Finally,based on the above research,the cruising condition of commercial vehicle thermoelectric generating unit is tested.