Method for calculating internal parameters of fuel cell system

Abstract

The invention discloses a method for calculating internal parameters of a fuel cell system, and belongs to the field of fuel cells. The method comprises the following steps: enabling a controller to give disturbance instructions of different duty ratios of hydrogen injection, so that the in-pile pressure and the backflow pressure of the hydrogen injection fluctuate; based on the change of the gas pressure fluctuation frequency spectrum, obtaining the relationship between the reflux flow of the ejector and the reflux hydrogen pressure of the ejector, the hydrogen pressure at the inlet of the ejector, the in-pile hydrogen pressure and the radius of the gas pressure fluctuation frequency spectrum; and calculating the actual backflow flow of the ejector based on the relational expression and the gas pressure fluctuation spectrum radius. According to the method, the backflow flow of the ejector is calculated in a mode of generating system response by using pressure disturbance when the electric pile works stably. The backflow flow of the ejector can be calculated and evaluated on line by utilizing the ejector and system characteristics on the basis of an ejector body without adding extra acquisition equipment, so that the actual ejection backflow flow can be obtained on the basis of reducing the system cost.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for calculating internal parameters of a fuel cell system. Background technique [0002] With the continuous reduction of petroleum and chemical resources, the development and requirements for new energy sources are getting higher and higher. Among them, fuel cells, as a kind of new energy sources, are those that directly convert the chemical energy stored in fuel and oxidant into electrical energy. The device has the characteristics of environmental friendliness and pollution-free. [0003] The fuel cell engine system uses the electrochemical reaction between the hydrogen stored in the hydrogen bottle and the oxygen from the air to generate electricity. The hydrogen reacts on the anode side of the fuel cell, and an exhaust valve is connected to the anode side of the stack, and the hydrogen flows back. pump or hydrogen ejector. Among them, the exhaust valve is to discharge th...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patent needs to add a differential pressure sensor in the ejector structure, which adds additional components to the design of the entire system structure, and has high requirements on the space layout, which makes the cost of the system higher, which is not conducive to wide application

[0005] Therefore, there is an urgent need to provide a calculation method for the internal parameters of the fuel cell system to solve the technical problem in the prior art that it is necessary to add a differential pressure sensor to the ejector structure to calculate and evaluate the return flow of the ejector on-line.

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