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
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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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