A fuel cell system and its control method

A fuel cell system and fuel cell technology, applied to fuel cells, circuits, electrical components, etc., can solve the problems of air compressor surge, improper handling of target pressure and target speed changes, and achieve the effect of preventing surge.

Active Publication Date: 2021-07-23
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 the target pressure and target speed changes when the fuel cell air compressor is abnormal in the voltage of the single chip of the fuel cell

Method used

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  • A fuel cell system and its control method
  • A fuel cell system and its control method
  • A fuel cell system and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 provides a fuel cell system control method, such as figure 2 Shown is the control method of the air compressor in the normal operation of the fuel cell system, including the following steps:

[0053] S101, judging whether purging is required according to the amount of liquid water in the cathode channel.

[0054] 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.

[0055] S102. Perform purging if necessary.

[0056] During the operation of the fuel cell, if the voltage of the fuel cell is low, in order to remove the liquid water accumulated in the cathode channel, the...

Embodiment 2

[0062] In order to prevent the fuel cell system from starting up and running normally, the air compressor surge phenomenon, this embodiment 2 provides a fuel cell system control method on the basis of embodiment 1, such as image 3 Shown is the control method of the air compressor and throttle valve during the start-up process of the fuel cell system, including the following steps:

[0063] S201. Control the throttle valve to fully open and start the air compressor at the first set speed.

[0064] 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 the target speed is the first set speed, preferably 0 rpm.

[0065] S202. Determine whether it is necessary to start up and purge, and if so, adjust the speed of the air compressor to the second set speed after the first set time.

[0066] According to the conditions, it is judged whether it is necessary to purge the liquid water accumulated in ...

Embodiment 3

[0071] In order to prevent the phenomenon of air compressor surge between the normal operation and shutdown of the fuel cell system, this embodiment 3 provides a fuel cell system control method on the basis of embodiment 1, such as Figure 4 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:

[0072] S301. Determine whether to shut down and purge.

[0073] According to the conditions, it is judged whether it is necessary to purge the liquid water accumulated in the cathode flow channel. If so, control the throttle valve to fully open, and adjust the speed of the air compressor to the second set speed after the first set time. When the purge ends , the control air compressor is powered off and the throttle valve is closed.

[0074] The first setting time is 1s, and the second setting speed is the rated speed of the air compressor.

[0075] S302. If not, control the throttle ...

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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 includes a fuel cell stack, an air compressor and a controller. The air compressor supplies air to the fuel cell stack through the air supply pipeline; the output end of the controller is connected to the air compressor, and the input end of the controller collects corresponding signals. During the operation of the fuel cell, when it is judged that it is necessary to purge according to the amount of liquid water in the cathode channel, the controller controls the air compressor to make the target pressure less than the target pressure limit value. The target pressure limit value is based on the current target speed and the air compressor. The surge curve is obtained to prevent the surge of the air compressor caused by abnormal disturbances, ensure the service life of the air compressor, and solve the problem of improper handling of the target pressure and target speed changes of the fuel cell air compressor when the fuel cell single chip voltage is abnormal. Air compressor surge problem.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04089H01M8/04119H01M8/04746H01M8/04992
CPCH01M8/04089H01M8/04179H01M8/04776H01M8/04992Y02E60/50
Inventor 曹卓涛王传秋李维国周鑫
Owner ZHENGZHOU YUTONG BUS CO LTD
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