Research On Thermoelectric Technology For Vehicle Exhaust Waste Heat And Simulation Application

In recent years, with the rising amount of vehicles and energy crisis being more serious, energy saving is becoming an important factor to the development of vehicle industry. There are more and more electronic products with the vehicle electrics progress, at the same time vehicle exhaust waste heat cost lots of energy. Thermoelectric technology can both recovery the exhaust waste heat and generate electric power, which leads to enhancing vehicle fuel economy. Thermoelctric technology for exhaust waste heat recovery is a state-of-art research which potential is infinite and may be a direction of assistant power system in the future. To improve the ability of independence research and development in this field, this dissertation focuses on thermoelectric system efficiency, vechile fuel economy increasing and thermoelectric system controller development.Firstly introduces the academic and applicaton background of this dissertation, progress of vehicle waste heat recovery, basic principle of thermoelectric theory, progress of thermoelectric material research, thermoelectric generator basic construction and research status of thermoelectric module. Meanwhile, the contents of the dissertation are put forward.Then analysis three typical thermoelectric generators for recovering exhaust waste heat, elucidates key point factor of power and efficiency of thermoelectric generator, a novel thermoelectric generator configuration is put forward, which have a spiral coils heat exchanger and is able to improve the thermoelectric generator ability of waste heat recovery. Based on modular method, builds up two configuration thermoelectric generator models, and validates the models through comparing simulation results and experiment results, and then integrates the thermoelectric generator model with ADVISOR. After building up simulation modles, analysis the thermoelectric generator output characters and parasitic lost, then optimizes TEG parameters based on GA method, sum up approaches to increasing thermoelectric generator power.Simulation application includes conventioal vehicle and hybrid electric vehicle. Analysis vehicle fuel efficiency that alternator is replaced by thermoelectric generator and compares the effect of the two configuration thermoelectric generator. And then analysis the effect of using thermoelectric generator on hybrid electric vehicle, results demonstrate that vehicle fuel efficiency can be improved through thermoelectric technology, the new tyepe of TEG achieve better effect.Finally describes TEG controller design for the thermoelectric generator. The control unit uses MC9S12D64 of Freescalce, important circuit includes DC-DC circuit, MPPT circuit, CAN bus circuit, etc. and programme was done in Codewarrior. After function test of controller, some credible tests including temperature, overload and EMC were done; test results show this TEG controller can work well under extreme condition.Major innovations are as follows:(1) Put forward a novel configuration thermoelectric generator which has an independent spiral coils heat exchanger to improve the ability for exhaust waste heat recovery.Then build up simulation model, analysis thermoelectric generator output characters and parasitic lost by simulation, optimize important parameters based on Genetic Algorithms.(2) Based on simulation, analysis TEG application effect on conventional vehicles and HEV, provide theory support for TEG application on vehicles at the beginging.(3) Design thermoelectric generator controller for vehicle exhaust waste heat recovery which provides DC-DC and MPPT control, finish reliability design and test.