Gas pressure control system and method

Abstract

The invention discloses a gas pressure control system and method. The gas pressure control system comprises a fuel cell controller FCU and a first back pressure regulator and / or a second back pressure regulator; the first back pressure regulator and / or the second back pressure regulator are / is connected to the FCU; the first back pressure regulator is arranged in an air outlet of a fuel cell stack; the second back pressure regulator is arranged in a hydrogen outlet of the fuel cell stack; the FCU is used for obtaining air pressure data of the air outlet of the fuel cell stack and / or the hydrogen pressure data of the hydrogen outlet of the fuel cell stack and regulating an opening angle of the first back pressure regulator according to the air pressure data and / or regulating an opening angle of the second back pressure regulator according to the hydrogen pressure data. The system and the method solve the problems that the low gas pressure in a flow channel of a fuel cell can affect the reaction efficiency of the fuel cell, the high gas pressure leads to difficulty in pile stealing, and the increase of differential pressure of gas at two sides is easy to cause a damage to a diaphragm in the existing technology.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, in particular to a gas pressure control system and method. Background technique [0002] During the driving process of hydrogen fuel electric vehicles, due to different road conditions and vehicle speeds, the actual output power of hydrogen fuel cells is also different. And due to the difference in power output, the amount of water produced by the fuel cell reaction product is also different. The water produced by the hydrogen / air proton exchange membrane fuel cell reaction is on the side of the air and needs to be discharged out of the stack along with the air. When the power output decreases, the water produced decreases, so the air flow needs to be reduced, otherwise the reaction film will be dried up, affecting the reaction efficiency; when the power output increases, the water produced increases, and the air flow needs to be increased Otherwise, water will accumulate inside the stac...

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Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a gas pressure control system and method to solve the problem that in the prior art, the gas pressure in the flow channel of the fuel cell will affect the reaction efficiency of the fuel cell, and the high gas pressure will cause the stack to be difficult to seal. The problem that the increase of the gas pressure difference on both sides is easy to damage the diaphragm

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