System for avoiding secondary freezing cold start failure of fuel cell and control method

Abstract

The invention discloses a system for avoiding secondary freezing cold start failure of a fuel cell and a control method. The system comprises a fuel cell stack, a temperature and humidity sensor, a heating humidifier, a three-way valve a, an air compressor, a temperature sensor, a gas-water separator, an electric circulating air pump, a three-way valve b, a water storage tank and a fuzzy controller. According to the invention, through the fuzzy controller, generated water can be rapidly discharged; the interior of the fuel cell stack is humidified and heated by controlling the heating humidifier; not only is the influence on the performance of the cell caused by excessive dryness in the fuel cell due to rapid discharge of water avoided, but also the temperature rise of the fuel cell stackcan be accelerated by rapid circulation of oxygen; the time for the fuel cell stack to reach the optimal working temperature is shortened, and the performance of the cell is improved; the fuzzy control theory is adopted to control the whole system; response can be quickly made according to monitored data; an accurate mathematical model is not needed; and good adaptability and fault tolerance are achieved.

Description

technical field [0001] The invention relates to a system and a control method for avoiding fuel cell secondary icing cold start failure, and belongs to the technical field of fuel cell cold start. Background technique [0002] With the development of industry, the demand for oil resources is increasing day by day. The limited oil resources make various industries have to focus on new energy, and the automobile industry is no exception. The proton exchange membrane fuel cell does not involve hydrogen-oxygen combustion in the power generation process, so it is not limited by the Carnot cycle, and the energy conversion rate is high; it does not produce pollution during power generation, the power generation unit is modular, has high reliability, and is very convenient for assembly and maintenance. There is no noise when working, so it is considered to be a clean and efficient green power supply. Therefore, the proton exchange membrane fuel cell is a promising energy conversion...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a system and a control method for avoiding secondary icing cold start failure of the fuel cell, which effectively prevents the hydrogen and oxygen from reacting to generate water due to the environmental The secondary freezing in the gas diffusion layer and flow channel at low temperature will eventually lead to the failure of fuel cell start-up, and ensure the stable output of fuel cell stack performance

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