Automobile engine tail gas waste-heat and electricity converting stand test device and method for controlling same

Abstract

The invention relates to an automobile engine tail gas waste-heat and electricity converting stand test device and method for controlling the same. The automobile engine tail gas waste-heat and electricity converting stand test device comprises an automobile engine unit, a waste-heat and electricity converting unit, an outputting and energy storing unit, a temperature detecting unit, a single-module patrolling unit and a main control unit and is characterize in that the automobile engine unit uses an automobile engine to drive a power generator to generate power to be combined to the three-phase commercial power and exhaust the high-temperature tail gas; the waste-heat and electricity converting unit absorbs the waste-heat from the tail gas and converts the waste-heat into the DC electricity; the outputting and energy storing unit changes the voltage of the generated DC electricity so as to supply the DC electricity to the load or store the DC electricity; the temperature detecting unit detects the temperature information of all the units; the single-module patrolling unit patrols the terminal voltages of waste-heat and electricity converting modules which are connected in parallel under each temperature gradient; and the main control unit detects the outputted voltage, the outputted current and other parameters, sends the control information and comprehensively manages the energy. The automobile engine tail gas waste-heat and electricity converting stand test device can simulate the automobile-mounted running environment and is suitable for the test and the research of the automobile engine tail gas waste-heat and electricity conversion.

Description

technical field [0001] The invention belongs to a thermoelectric conversion device and a control method, in particular to a thermoelectric conversion bench test device and a control method for exhaust heat of an automobile engine exhaust. Background technique [0002] In recent years, due to the continuous improvement of the performance of thermoelectric materials in technology, as well as factors such as the greenhouse effect and carbon dioxide emission reduction on environmental protection issues, the use of thermoelectric conversion technology to further convert a large amount of waste heat into electrical energy has been widely accepted by Japan, the United States, Europe, etc. attention of advanced countries. Low-temperature waste heat, especially the reuse of waste heat below 300°C, has increased the competitiveness of thermoelectric power generation. Some emerging application research, such as waste incineration waste heat, steelmaking plant waste heat, especially the...

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Problems solved by technology

[0003] At present, most of the existing automobile engine exhaust waste heat thermoelectric conversion devices use the cooling water of about 90°C in the engine's own cooling system to keep the temperature of the cold end of the thermoelectric conversion module constant to generate electricity. Because the cold end temperature is high and cannot be adjusted, especially in the engine When the speed is low, the temperature difference between the cold and hot ends is small, so that the thermoelectric conversion efficiency and energy utilization rate are not high, and the output power is mostly below 500W, which results in an obvious lack of load capacity. Therefore, it is often necessary to plug in a large-capacity battery to power the vehicle. In this way, the cost recovery period after being put into use in the car is too long (it will take at least 4 years to save 5% of the fuel expenditure)

In addition, the lack of effective monitoring and control of the terminal voltage and internal resistance of the thermoelectric conversion single module under different temperature differences has greatly reduced the service life, reliability and safety of the thermoelectric conversion module, and the maintenance cost is too high. Factors seriously hinder its future marketization and industrialization

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