Hydrogen pressure control method and device of fuel cell engine system

Abstract

The invention discloses a hydrogen pressure control method and device for a fuel cell engine system. The method comprises steps of pre-defining a target hydrogen pile-in pressure, and obtaining an actual hydrogen pile-in pressure; calculating a difference value between the target hydrogen in-pile pressure and the actual hydrogen in-pile pressure, and calculating a change rate of the actual hydrogen in-pile pressure; taking the difference value and the change rate as the input of a fuzzy control algorithm, and adjusting the output of the fuzzy control algorithm according to a threshold rule toobtain regulation and control output; and adjusting the hydrogen reactor inlet pressure according to the regulation and control output. According to the method, a fuzzy controller control mode is adopted, so extremely high stability and a rapid response effect are achieved; by judging the demand instruction, meaningless control of certain intervals is avoided, and the power consumption of hardwareis reduced; by limiting the output range of the signals, overshoot of the control signals under special conditions is avoided.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a hydrogen pressure control method and device for a fuel cell engine system. Background technique [0002] Fuzzy control: It is essentially a kind of nonlinear control, which belongs to the category of intelligent control. A major feature of fuzzy control is that it has both systematic theory and a large number of practical application backgrounds. [0003] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high; in addition, the fuel cell uses fuel and oxygen as raw materi...

AI Technical Summary

Problems solved by technology

The faster the response of traditional PID control, the greater the overshoot, and the poor anti-interference ability The steady-state error is large

[0006] At present, the design of the control model is based on the target pressure and the actual pressure. The control method is relatively simple, but the pressure fluctuation is large, the response speed is slow, and the adaptability of the control model is poor.

The hydrogen pressure difference between the front and rear ends of the hydrogen supply device based on the ejector principle is extremely large. Generally, the front section is required to be >10bar, and the rear end is ≤1bar. If the response is too slow, the back-end pressure will overshoot, affecting the performance and durability of the stack. security can also be affected

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