Urban rail vehicle air conditioner system fault diagnosis method and device
A technology for air-conditioning systems and urban rail vehicles, which is applied in the field of fault diagnosis of air-conditioning systems of urban rail vehicles, and can solve problems such as the inability to directly observe internal components, the inability to structure the air-conditioning system, and reduce the efficiency and accuracy of fault diagnosis.
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Embodiment 1
[0065] like figure 1 Shown is a flow chart of a method for fault diagnosis of an air-conditioning system of an urban rail vehicle according to the present invention, and the method may include:
[0066] Step S101: Acquiring fault signals collected by the collection module when monitoring the air-conditioning system.
[0067] In the practical application of the embodiment of the present invention, the air-conditioning system of the urban rail vehicle can be monitored in real time through the acquisition module, so as to collect the fault signal of the air-conditioning system in time. Wherein, the acquisition module may specifically be a sensor connected to various components of the air-conditioning system, and the type of the sensor may be determined according to the requirements of the components connected to it, and the fault signal may specifically be a voltage or current signal.
[0068] Step S102: Using wavelet packet transform algorithm to process the fault signal to obt...
Embodiment 2
[0088] like image 3 As shown, it is a flow chart of another urban rail vehicle air-conditioning system fault diagnosis method of the present invention, and the method may include:
[0089] Step S301: Acquiring fault signals collected by the collection module when monitoring the air-conditioning system.
[0090] Step S302: Perform wavelet packet decomposition on the fault signal by using a preset decomposition scale to obtain each frequency signal in the fault signal.
[0091] In the embodiment of the present invention, since the wavelet packet decomposition of the fault signal is implemented using a hierarchical method, the preset decomposition scale refers to the number of layers of wavelet packet decomposition of the fault signal.
[0092] Step S303: extracting the signal features of each frequency signal at each preset resolution scale as a reconstructed signal corresponding to each frequency signal at the preset resolution scale.
[0093] like figure 2 In the example ...
Embodiment 3
[0131] like Figure 4 As shown, it is a structural schematic diagram of a fault diagnosis device for an air-conditioning system of an urban rail vehicle according to the present invention, and the device may include:
[0132] The first acquisition module S401: used for acquiring fault signals collected by the acquisition module when monitoring the air conditioning system.
[0133]The first processing module S402 is used to process the fault signal by using the wavelet packet transform algorithm to obtain the reconstructed signal of each frequency signal in the fault signal.
[0134] Wherein, in the embodiment of the present invention, the first processing module S402 may include:
[0135] The first decomposition unit is configured to perform wavelet packet decomposition on the fault signal by using a preset decomposition scale to obtain each frequency signal in the fault signal.
[0136] The first extraction unit is used to extract the signal features of each frequency signa...
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