Fuel cell air circuit, air extraction device control method and controller

Abstract

The invention provides a fuel cell air circuit. The fuel cell air circuit comprises a fuel cell stack, an air compressor arranged on the intake pipe of the fuel cell stack, and a pumping device whichis arranged on the exhaust pipe of the fuel cell stack. The pumping device is used for extracting gas in the fuel cell stack. According to the invention, the pumping device is arranged on the exhaustpipe of the fuel cell stack; when the air compressor has a surge phenomenon, unreacted gas in the fuel cell stack can be discharged in time by turning on the pumping device; gas flow resistance and pressure drop in the fuel cell stack are reduced; the surge of the air compressor is prevented; normal operation of a fuel cell engine is ensured; and the impact of surge on the service life of the aircompressor is reduced. The embodiment of the invention further discloses a pumping device control method and a controller.

Description

technical field [0001] The invention relates to the technical field of fuel cell vehicles, and more specifically relates to a fuel cell air circuit, a method for controlling an air extraction device, and a controller. Background technique [0002] As people have higher and higher requirements on the environment, clean energy vehicles are more and more favored by consumers. Fuel cell vehicle is a kind of electric vehicle. Its core component is the fuel cell. The hydrogen used as fuel in the fuel cell carried by the vehicle undergoes a redox chemical reaction with the oxygen in the atmosphere to generate electric energy to drive the motor to work. The mechanical transmission structure in the car, and then drives the front axle (or rear axle) and other walking mechanical structures of the car to work, thereby driving the electric car forward. Due to the advantages of energy saving, zero emission, no pollution, high efficiency, low noise, and high reliability, fuel cell vehicle...

AI Technical Summary

Problems solved by technology

Surge will destroy the flow regularity of its internal medium, generate mechanical noise, cause strong vibration of working parts, and accelerate the damage of bearings and seals

[0005] The centrifugal electric air compressor may have a surge phenomenon in the state of low flow rate. When the centrifugal electric air compressor is used to match the proton exchange membrane fuel cell engine, due to the complexity of the internal structure of the battery stack, the gas flow resistance in the battery stack And the pressure drop is large, which may cause the unreacted gas in the battery stack to be discharged out of the battery stack in time due to the large gas flow resistance and pressure drop inside the fuel cell stack when the fuel cell engine is running, resulting in centrifugal electric air compression The accumulation of air in the engine reduces the air flow rate, which causes the air compressor to surge, which cannot provide a stable air flow rate for the electrochemical reaction in the fuel cell stack, which in turn affects the normal operation of the fuel cell engine and affects the centrifugal air flow. The service life of the compressor is adversely affected

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