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Fuel cell system and control method thereof

A fuel cell system and fuel cell technology, applied in the direction of fuel cells, fuel cell additives, reactant parameter control, etc., can solve problems such as air compressor surge, improper handling of system target pressure changes, etc.

Active Publication Date: 2019-10-22
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fuel cell system and its control method to solve the problem of surge of the air compressor caused by improper handling of changes in the speed of the air compressor and the system target pressure during the switching process of the fuel cell on and off

Method used

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  • Fuel cell system and control method thereof
  • Fuel cell system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1 provides a fuel cell system start-up control method, such as figure 2 As shown, it is the control mode of the air compressor in the process of switching from start-up to normal operation of the fuel cell system, including the following steps:

[0067] S101. When the fuel cell is turned on, the controller controls the throttle valve to fully open and starts the air compressor at the first set speed.

[0068] The fuel cell controller controls the full opening of the throttle valve and at the same time controls the start of the air compressor, and preferably the first set speed is 0 rpm.

[0069] S102. When the controller judges that it is necessary to power on and purge, adjust the speed of the air compressor to the second set speed after the first set time.

[0070] According to the conditions, judge whether it is necessary to purge the liquid water accumulated in the cathode flow channel. When it is necessary to purge, adjust the speed to the second set s...

Embodiment 2

[0075] In order to prevent the phenomenon of air compressor surge between normal operation and shutdown of the fuel cell system, this embodiment 2 provides a fuel cell system shutdown control method, such as image 3 As shown, the control mode of the air compressor and the throttle valve during the shutdown process of the fuel cell system includes the following steps:

[0076] S201. Determine whether to shut down and purge.

[0077] According to the conditions, it is judged whether it is necessary to purge the liquid water accumulated in the cathode channel, and if so, the throttle valve is fully opened, and the speed of the air compressor is adjusted to the first set speed value after the first set time. Preferably, the first set time is 1s, and the first set rotational speed is the rated rotational speed, so as to achieve the best purging effect.

[0078] S202. If not, control the throttle valve to fully open, and adjust the air compressor to stop and close the throttle val...

Embodiment 3

[0083] On the basis of embodiment 1 or embodiment 2, this embodiment 3 provides a control method for a fuel cell system during normal operation, such as Figure 4 Shown is the control method of the air compressor in the normal operation of the fuel cell system, including the following steps:

[0084] S301, judging whether purging is required according to the amount of liquid water in the cathode channel.

[0085] There are many ways to judge the amount of liquid water in the cathode flow channel. It can be judged whether purge is needed by judging whether the voltage of the fuel cell single chip is lower than the set voltage threshold. At this time, the fuel cell controller is connected to the corresponding fuel cell single chip through the input terminal. The voltage signal output terminal is used to obtain the single-chip voltage of the fuel cell.

[0086] S302. Perform purging if necessary.

[0087] During the operation of the fuel cell, if the voltage of the fuel cell is...

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Abstract

The invention relates to the technical field of fuel cell air compressor control, in particular to a fuel cell system and a control method thereof. The system comprises a fuel cell stack, an air compressor, a controller and a throttle valve arranged on an air outlet pipeline of the fuel cell stack, wherein the air compressor supplies air into the fuel cell stack through the air supply pipeline; the output end of the controller is connected with the air compressor and the throttle valve, the input end of the controller collects a corresponding signal, when a fuel cell is started, the throttle valve is controlled to be fully opened, the air compressor is started at a first set rotating speed, and when the fuel cell is required to be started for blowing, the rotating speed of the air compressor is adjusted to be a second set rotating speed after first set time; when the fuel cell is shut down, if the controller determines that blowing shut-down is needed, the throttle valve is controlledto be fully opened, and the rotating speed of the air compressor is adjusted to be a first set rotating speed value after first set time, so that the matching of the rotating speed and the back pressure of the air compressor in the starting and shutting stages is ensured, and the problem of surge of the air compressor in the starting and shutting stages is solved.

Description

technical field [0001] The invention relates to the technical field of fuel cell air compressor control, in particular to a fuel cell system and a control method thereof. 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 air. In the air system, the air is compressed and pumped i...

Claims

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Application Information

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IPC IPC(8): H01M8/04082H01M8/04089H01M8/04302H01M8/04303H01M8/04746H01M8/04492
CPCH01M8/04089H01M8/04201H01M8/04302H01M8/04303H01M8/04507H01M8/04776Y02E60/50
Inventor 曹卓涛王传秋李维国周鑫
Owner ZHENGZHOU YUTONG BUS CO LTD
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