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A fuel cell air excess ratio control method and system

A fuel cell and air system technology, applied in the direction of fuel cell control, fuel cells, fuel cell additives, etc., can solve the problems of air excess ratio deviation, difficulty in adjusting the fuel cell air excess ratio current matching, etc., to achieve improvement The effect of sensitivity

Active Publication Date: 2020-10-02
ZHENGZHOU YUTONG BUS CO LTD
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Problems solved by technology

[0006] The invention provides a fuel cell air excess ratio control method and system to solve the problem that the air excess ratio will shift in one direction caused by the control delay of the existing air excess ratio control method, and it is difficult to adjust the fuel cell air excess ratio Problems matching fuel cell current

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  • A fuel cell air excess ratio control method and system
  • A fuel cell air excess ratio control method and system
  • A fuel cell air excess ratio control method and system

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Embodiment Construction

[0030] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] Embodiment of the fuel cell air excess ratio control method of the present invention

[0032] The fuel cell air excess ratio control method of this embodiment includes the following steps:

[0033] 1) Measure the oxygen concentration of the air system tail exhaust in real time, and compare the oxygen concentration measurement value with the oxygen concentration reference value. in an oxygen-poor state;

[0034] 2) Calculate the feedback constant K when performing PID control on the hydrogen intake amount according to the difference between the oxygen concentration measurement value and the oxygen concentration reference value;

[0035] 3) Judging the oxygen-containing state of the current air system exhaust, if the current air system exhaust is in an oxygen-rich state, and the air system exhaust is in an oxygen-poor state at...

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Abstract

The invention relates to a fuel cell air excess ratio control method and system. The method comprises the steps of measuring the oxygen concentration of tail gas of an air system in real time; calculating a feedback constant K when a hydrogen intake amount is subjected to PID control according to a difference value between an oxygen concentration measurement value and an oxygen concentration reference value; and judging an oxygen-containing state of the tail gas of the current air system, and according to the change of the oxygen-containing state at the current moment and the previous moment,adding or subtracting different ratio values to or from the feedback constant K to obtain a new feedback constant for calculating the hydrogen intake amount. The system comprises a fuel cell controller, and an air flowmeter, an oxygen concentration sensor, a current sensor and a hydrogen regulating valve connected with the fuel cell controller. The method and the system can effectively improve thecontrol sensitivity, and an air excess ratio is smoothly changed through feedback control of the feedback constant, so that the air excess ratio and a fuel cell current can be conveniently adjusted to be in a matched state, and constant control can be achieved.

Description

technical field [0001] The invention relates to the technical field of fuel cell control, in particular to a fuel cell air excess ratio control method and system. Background technique [0002] A fuel cell is a power generating device that converts chemical energy stored in hydrogen fuel and oxidant directly into electricity. Since it does not involve hydrogen-oxygen combustion in the power generation process, it is not limited by the Carnot cycle, and has the advantages of high energy conversion efficiency and environmental friendliness. At the same time, the fuel cell also has the advantages of rapid startup at room temperature, no electrolyte loss, specific power and Outstanding features such as higher specific energy. Based on the above advantages, fuel cells, as a new generation of power generation technology, will have broad application prospects. [0003] The oxidant of existing fuel cells mostly uses oxygen in the air, and the air is continuously pumped into the sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04298H01M8/0438H01M8/04746
CPCH01M8/04298H01M8/0438H01M8/04746Y02E60/50
Inventor 曹卓涛李维国王传秋周鑫
Owner ZHENGZHOU YUTONG BUS CO LTD
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