A kind of air system control method of fuel cell

Abstract

The invention provides an air system control method of a fuel cell, which includes obtaining target air pressure and target air flow according to the operating state of the fuel cell; sampling the actual air pressure and actual air flow in the current stack; Calculate the decoupling speed and deviation opening by pressure; calculate the decoupling opening and deviation speed according to the actual air flow and target air flow; The opening degree, the deviation opening degree and the feed-forward compensation opening degree obtained through calibration are used to calculate the adjustment opening degree; adjust the speed of the air compressor of the fuel cell according to the adjustment speed and adjust the opening degree of the back pressure valve of the fuel cell according to the adjustment opening degree. The method has the advantages of: realizing precise tracking control of air flow and air pressure target values; improving the response speed of the fuel cell air system.

Description

technical field [0001] The invention relates to a control method, in particular to an air system control method of a fuel cell. Background technique [0002] Hydrogen fuel cell vehicle technology is becoming more and more mature. As a new energy vehicle with zero pollution and zero emissions, hydrogen fuel cell vehicles have increasingly entered the transportation system and have been widely recognized by the public. Fuel cell vehicles use hydrogen as fuel, and through the fuel engine, chemical energy is efficiently converted into electrical energy to drive the vehicle. The whole process only discharges pure water, so it is the most ideal energy-saving, environmentally friendly and zero-emission vehicle to replace traditional fossil fuel vehicles in the near future Transportation. [0003] The air supply system is one of the main systems of the fuel cell, in which air flow and air pressure are two basic parameters of the air supply system, both of which need to be precisely...

AI Technical Summary

Problems solved by technology

If the air flow rate is too low, it will cause insufficient oxygen supply to the fuel cell, thereby reducing the output voltage of the fuel cell stack, that is, a "starvation" phenomenon; similarly, if the air flow rate exceeds a certain limit, not only will the output voltage of the fuel cell stack not be increased , but will increase the parasitic power of the air system

Sustained large fluctuations in air pressure will cause fatigue damage to the proton exchange membrane

Therefore, the precise control of air flow and air pressure not only affects the chemical reaction speed of the fuel cell stack and the performance of the proton exchange membrane, but also affects the power generation efficiency and load capacity of the fuel cell stack

[0004] Due to the strong nonlinear and high coupling characteristics of air flow and air pressure, it is difficult for the existing air supply system to precisely control the air flow and air pressure in the fuel cell stack

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