Hydrogen control method for proton exchange membrane fuel cell system for vehicle

Abstract

The invention provides a hydrogen control method for a proton exchange membrane fuel cell system for a vehicle. The method comprises the following steps of acquiring anode inlet hydrogen pressure and cathode inlet hydrogen pressure of a fuel cell stack, and calculating target hydrogen pressure; calculating a pressure deviation between the target hydrogen pressure and the actually measured hydrogen pressure; designing a hydrogen control calculation model, and inputting the pressure deviation and the variation of the pressure deviation into the hydrogen control calculation model to calculate a hydrogen control quantity; and inputting the calculated hydrogen control quantity into an actuator for hydrogen control. A fuzzy logic PI algorithm is adopted, fuzzy logic can be adjusted at any time according to experience of engineers, control is more flexible, and adaptability is higher; feedforward compensation is adopted, and compared with a traditional PID control algorithm, by using the method of the invention, hydrogen pressure fluctuation can be further reduced, and the hydrogen pressure control precision is improved; and a fuel cell hydrogen flow mathematical model and a differential pressure physical model do not need to be established, the tedious process of model identification is avoided, a response speed is higher, and robustness is higher too.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for controlling hydrogen in a vehicle-used proton exchange membrane fuel cell system. Background technique [0002] Fuel cell vehicles are an important branch of new energy vehicles. Due to their advantages such as fast filling speed, high efficiency, low noise, and zero emissions, they are considered to be one of the ultimate solutions for future vehicles. When a fuel cell operates under alternating loads, the hydrogen pressure has a significant impact on engine performance and service life, and long-term conditions of too low pressure can easily cause hydrogen starvation or water management problems. At the same time, the excessive pressure difference between the cathode and the anode will cause excessive mechanical stress on the exchange membrane, and pinholes or cracks will spontaneously form under the condition of unbalanced pressure. performance and...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a hydrogen control method for a vehicle-used proton exchange membrane fuel cell system, which overcomes that the existing hydrogen pressure control method cannot accurately control the hydrogen flow or pressure fluctuation within the required range, and the control method has a slow response speed and low robustness. high problem

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