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Fuel cell automobile hydrogen system and fault detection method thereof

A fuel cell and fault detection technology, which is applied in battery/fuel cell control devices, electric vehicles, electrical devices, etc., and can solve problems such as reduced comfort and misjudgment of faults

Active Publication Date: 2021-09-14
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fuel cell vehicle hydrogen system to solve the problem of decreased comfort caused by fault misjudgment during vehicle operation
[0007] Another object of the present invention is to provide a fuel cell hydrogen system fault detection method to solve various fault misjudgment problems caused by failure to set comprehensive judgment conditions during vehicle operation

Method used

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  • Fuel cell automobile hydrogen system and fault detection method thereof
  • Fuel cell automobile hydrogen system and fault detection method thereof
  • Fuel cell automobile hydrogen system and fault detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as image 3 As shown, the flow path between the pressure reducing valve and the fuel cell is set as the first flow path. In this embodiment, the pressure sensor detects that the hydrogen pressure P of the first flow path is greater than the set maximum value P H , the controller judges that the pressure value is suspected to have an abnormal low hydrogen pressure and low pressure.

[0040] Further, the controller judges the state of the fuel cell. If the fuel cell is in the working state, that is, S=1, it is determined that the hydrogen pressure in the first flow path has a low-voltage or high fault; if the fuel cell is in the non-working state, that is, S=0, continue to judge the first flow path Whether the hydrogen pressure is greater than the lock-up pressure P of the pressure reducing valve lock , if the hydrogen pressure in the first flow path is greater than the lock-up pressure of the pressure reducing valve, it is judged that the hydrogen pressure in the f...

Embodiment 2

[0042] Such as Figure 4 As shown, the difference between this embodiment and the first embodiment is that the state of the fuel cell is added as a judgment condition when detecting the failure of the hydrogen system of the fuel cell. In this embodiment, the pressure sensor detects that the hydrogen pressure P in the first flow path is greater than the set maximum value P H , the controller judges that the pressure value is suspected to have an abnormal low hydrogen pressure and low pressure.

[0043] Further, the controller judges the state of the fuel cell. If the fuel cell is in the working state, that is, S=1, continue to judge whether the hydrogen pressure in the first flow path is greater than the lock-up pressure P of the pressure reducing valve. lock , if the hydrogen pressure in the first flow path is greater than the lock-up pressure of the pressure reducing valve, it is judged that the hydrogen pressure in the first flow path is too low and the performance of the p...

Embodiment 3

[0045] Such as Figure 5 As shown, the difference between this embodiment and the second embodiment is that the rate of change of fuel cell power is added as a judgment condition when detecting the failure of the hydrogen system of the fuel cell, and when the rate of change of fuel cell power sharply increases or decreases, different vehicles Specifically, the corresponding judgment conditions can be obtained through experiments. In this embodiment, the judging range for the drastic change in the power of the fuel cell is as follows: within a period of time t, when the change in the response power of the fuel cell exceeds the ratio m of the rated power of the fuel cell, it can be considered that the power of the fuel cell has changed Rapid increase or decrease, according to different vehicles, t takes 5-20s, m takes 70-90%. In this embodiment, the pressure sensor detects that the hydrogen pressure P in the first flow path is greater than the set maximum value P H , the contro...

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PUM

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Abstract

The invention relates to a fuel cell automobile hydrogen system and a fault detection method thereof, and belongs to the technical field of fuel cell new energy. In the prior art, the fault determination of fuel cell hydrogen systems is supposed to be on the premise that a fuel cell runs in an ideal state, and no other judgment condition is supplemented, so that fault misjudgment occurs when the fuel cell does not run in the ideal state, and the driving comfort of an automobile is reduced due to the fault misjudgment. According to the fuel cell automobile hydrogen system and the fault detection method thereof, a flow path between a pressure reducing valve and a fuel cell is set as a first flow path, and fault detection comprises hydrogen pressure low-pressure over-high fault detection of the first flow path and / or hydrogen pressure low-pressure over-low fault detection of the first flow path; and by introducing judgment conditions such as the starting-stopping state of the fuel cell and the real-time power change rate of the fuel cell, fault detection of the fuel cell hydrogen system is real-time and accurate, false alarm is prevented, and the using comfort of an automobile is improved.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a fuel cell vehicle hydrogen system and a fault detection method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy. It only needs to feed fuel and oxidant to continuously output electrical energy. It has the advantages of high energy conversion rate, clean and environmental protection. Due to its advantages of high efficiency and zero emission, fuel cell vehicles have become an important direction for the development of new energy vehicles. The current hydrogen storage method of fuel cell vehicles is stored in high-pressure gas cylinders. The normal supply of hydrogen can only be realized after the pressure of high-pressure hydrogen is reduced to the pressure range required by the fuel cell through a pressure reducing valve. During the working process of the pressure reducing valve, the outlet pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L3/00B60L58/30
CPCB60L3/0053B60L58/30Y02T90/40Y02E60/50
Inventor 李江川李力军张金亮司耀辉张龙海
Owner ZHENGZHOU YUTONG BUS CO LTD
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