CN114750794B - Train air conditioning unit health management system - Google Patents
Train air conditioning unit health management system Download PDFInfo
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- CN114750794B CN114750794B CN202210459628.2A CN202210459628A CN114750794B CN 114750794 B CN114750794 B CN 114750794B CN 202210459628 A CN202210459628 A CN 202210459628A CN 114750794 B CN114750794 B CN 114750794B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 89
- 230000036541 health Effects 0.000 title claims abstract description 73
- 238000004458 analytical method Methods 0.000 claims abstract description 133
- 230000005494 condensation Effects 0.000 claims abstract description 49
- 238000009833 condensation Methods 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000001704 evaporation Methods 0.000 claims description 15
- 238000004422 calculation algorithm Methods 0.000 claims description 8
- 238000005094 computer simulation Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 238000010835 comparative analysis Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010801 machine learning Methods 0.000 claims description 4
- 238000003062 neural network model Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 12
- 206010063385 Intellectualisation Diseases 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0081—On-board diagnosis or maintenance
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a health management system of a train air conditioning unit, which comprises a data acquisition processing module, an air path loop analysis module and a condensation loop analysis module; the data acquisition processing module is used for acquiring variable index data of each air conditioning unit of the vehicle in real time and cleaning the data; the air path loop analysis module is used for carrying out health analysis on the air path loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the air path corresponding to the air conditioning unit meeting the conditions; the condensation loop analysis module is used for carrying out health analysis on the condensation loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the corresponding condensation loop of the air conditioning unit meeting the conditions. Compared with the prior art, the intelligent maintenance system and the intelligent maintenance method help rail transit maintenance personnel to realize intelligent maintenance work, realize data intellectualization and have strong timeliness.
Description
Technical Field
The invention relates to the field of embedded network equipment, in particular to a health management system of a train air conditioning unit.
Background
In modern trains, the functions of vehicle MVB bus data acquisition and vehicle-ground wireless transmission are perfect and stable, and meanwhile, the vehicle MVB bus data acquisition and vehicle-ground wireless transmission are widely applied to a plurality of places and vehicles in the whole country. Big data modeling and analysis technology has penetrated in the field of industrial internet and internet of things.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a train air conditioning unit health management system which helps rail transit maintenance personnel to realize intelligent maintenance work, realizes data intellectualization and has strong timeliness.
The aim of the invention can be achieved by the following technical scheme:
a health management system of a train air conditioning unit comprises a data acquisition processing module, an air path loop analysis module and a condensation loop analysis module;
the data acquisition processing module is used for acquiring variable index data of each air conditioning unit of the vehicle in real time and cleaning the data;
the air path loop analysis module is used for carrying out health analysis on the air path loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the corresponding air path of the air conditioning unit meeting the conditions;
the condensation loop analysis module is used for carrying out health analysis on the condensation loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and health index of the corresponding condensation loop of the air conditioning unit meeting the conditions.
Further, the data acquisition processing module includes:
the data acquisition unit is used for acquiring variable index data of each air conditioning unit of the vehicle in real time;
the data cleaning unit is used for carrying out data calculation and cleaning on variable index data of each air conditioning unit of the vehicle;
the data transmission unit is used for transmitting the variable index data of each air conditioning unit of the vehicle after data calculation and cleaning to the air circuit analysis module and the condensation circuit analysis module.
Further, the data transmission unit adopts a redundant design.
Further, the data transmission unit is in communication with the wind circuit analysis module and the condensation circuit analysis module through an AES128 and MD5 encryption algorithm.
Further, the wind path loop analysis module and the condensation loop analysis module perform health analysis through a health analysis model, wherein the health analysis model comprises one or more of a life cycle dynamic simulation model, a life cycle dynamic simulation scoring model, a dynamic difference analysis model for individual performance evaluation, an ARIMAX algorithm, a neural network model, a machine learning model and a traditional probability prediction and scoring model based on probability theory.
Further, the variable index data of the air path comprises average return air temperature, air supply temperature, fresh air temperature, combination difference conditions of the temperatures and health indexes of the air path.
Further, the wind path loop analysis module includes:
the system comprises an air path loop health analysis unit, a control unit and a control unit, wherein the air path loop health analysis unit is used for carrying out health analysis on an air path loop of each air conditioning unit according to variable index data of each air conditioning unit of a vehicle to generate an air path loop health analysis result;
the air path ranking distribution unit is used for generating variable index data ranking distribution conditions of the air path loop in the form of a chart;
the air path ranking subdivision unit is used for generating the description content of the variable index data ranking result of the air path loop in the form of a chart;
the air path index analysis unit is used for generating the comparison condition of a single variable index of the air path and the average value in all air conditioning units and the comparison analysis of the actual temperature and the average temperature, and displaying various variable index data of the air path through a box graph;
the air path index overview unit is used for providing comparative analysis of a plurality of variable index data of the air path and checking the variable index data of a certain time period;
the wind path history analysis unit is used for checking the change condition of the variable index data of the current wind path in a certain period.
Further, the variable index data of the condensing loop comprises condensing temperature, air suction temperature, exhaust temperature, evaporating temperature, condensing and exhaust temperature difference, air suction and evaporating temperature difference, exhaust and air suction temperature difference, evaporating and evaporating temperature difference, evaporating and condensing temperature difference and condensing loop health index.
Further, the condensing loop analysis module includes:
the condensing loop health analysis unit is used for carrying out health analysis on the condensing loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle to generate a condensing loop health analysis result;
the condensing ranking distribution unit is used for generating variable index data ranking distribution conditions of the condensing loop in the form of a chart;
the condensation ranking subdivision unit is used for generating the description content of the variable index data ranking result of the condensation loop in the form of a chart;
the condensing index analysis unit is used for generating the comparison condition of single variable index data of the condensing loop and the average value in all air conditioning units, and displaying all variable index data of the condensing loop through a box graph;
the condensation index overview unit is used for providing comparative analysis of a plurality of variable index data of the condensation loop and checking the variable index data of a certain time period;
and the condensation history analysis unit is used for checking the variable index data change condition of the condensation loop of the current condensation loop in a certain period.
Further, the specific process of data cleaning comprises the following steps:
and receiving fault data of the air conditioning unit in real time, judging whether the fault needs reporting processing according to data continuity, if so, generating fault information, and carrying out processing such as real-time alarm and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a health management system of a train air conditioning unit, which comprises a data acquisition processing module, an air path loop analysis module and a condensation loop analysis module; the system comprises a data acquisition processing module, a wind path loop analysis module, a track traffic maintenance personnel, a health management system and a rail traffic maintenance personnel, wherein the data acquisition processing module is used for acquiring variable index data of each air conditioning unit of a vehicle in real time and carrying out data cleaning, the wind path loop analysis module is used for carrying out health analysis on a wind path loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, inquiring variable index data and health indexes of corresponding air conditioning units of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and the health management system is used for acquiring and summarizing operation time sequence data of the air conditioning system of the vehicle in real time based on the technical background of wireless transmission, and predicting and early warning faults, health and even life in the whole life cycle of the air conditioning system, so that the intelligent maintenance work is realized by the track traffic maintenance personnel, the data is intelligent and the timeliness is strong;
(2) The data transmission unit adopts a redundant design, has high-reliability real-time communication, and ensures the reliability of variable index data transmission of each air conditioning unit of the vehicle;
(3) The data transmission unit, the air path loop analysis module and the condensation loop analysis module are communicated by adopting AES128 and MD5 encryption algorithm, so that the safety and reliability of communication data are ensured, the communication data are not illegally acquired and cracked, and the safety is high.
Drawings
FIG. 1 is a data flow diagram of the present invention;
FIG. 2 is a graph of an air conditioner operation and fault modeling index system;
FIG. 3 is a graph of an air conditioner operating temperature, humidity and quality tracking index system.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
A health management system of a train air conditioning unit is applied to a subway heating ventilation air conditioning unit and comprises a data acquisition and processing module, an air path loop analysis module and a condensation loop analysis module;
the data acquisition processing module is used for acquiring variable index data of each air conditioning unit of the vehicle in real time and cleaning the data;
the data acquisition processing module comprises:
the data acquisition unit is used for acquiring variable index data of each air conditioning unit of the vehicle in real time;
the data cleaning unit is used for carrying out data calculation and cleaning on variable index data of each air conditioning unit of the vehicle;
the data transmission unit is used for transmitting the variable index data of each air conditioning unit of the vehicle after data calculation and cleaning to the air circuit analysis module and the condensation circuit analysis module.
The air path loop analysis module is used for carrying out health analysis on the air path loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the air conditioning unit corresponding to the air path meeting the conditions.
The whole operation and fault tracking and modeling index system of the subway heating, ventilation and air conditioning system is shown in fig. 2, and the operation air temperature, humidity and quality tracking index system of the subway heating, ventilation and air conditioning system is shown in fig. 3.
The variable index data of the air path comprises average return air, air supply, fresh air temperature, combination difference conditions of the temperatures and health indexes of the air path.
The wind path loop analysis module includes:
the system comprises an air path loop health analysis unit, a control unit and a control unit, wherein the air path loop health analysis unit is used for carrying out health analysis on an air path loop of each air conditioning unit according to variable index data of each air conditioning unit of a vehicle to generate an air path loop health analysis result;
the air path ranking distribution unit is used for generating variable index data ranking distribution conditions of the air path loop in the form of a chart;
the air path ranking subdivision unit is used for generating the description content of the variable index data ranking result of the air path loop in the form of a chart;
the air path index analysis unit is used for generating the comparison condition of a single variable index of the air path and the average value in all air conditioning units and the comparison analysis of the actual temperature and the average temperature, and displaying various variable index data of the air path through a box graph;
the air path index overview unit is used for providing comparative analysis of a plurality of variable index data of the air path and checking the variable index data of a certain time period;
the wind path history analysis unit is used for checking the change condition of the variable index data of the current wind path in a certain period.
The condensation loop analysis module is used for carrying out health analysis on the condensation loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the corresponding condensation loop of the air conditioning unit meeting the conditions.
The variable index data of the condensing loop comprises condensing temperature, air suction temperature, air discharge temperature, evaporating temperature, condensing and air discharge temperature difference, air suction and evaporating temperature difference, air discharge and air suction temperature difference, evaporating and evaporating temperature difference, evaporating and condensing temperature difference and condensing loop health index.
The condensing loop analysis module includes:
the condensing loop health analysis unit is used for carrying out health analysis on the condensing loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle to generate a condensing loop health analysis result;
the condensing ranking distribution unit is used for generating variable index data ranking distribution conditions of the condensing loop in the form of a chart;
the condensation ranking subdivision unit is used for generating the description content of the variable index data ranking result of the condensation loop in the form of a chart;
the condensing index analysis unit is used for generating the comparison condition of single variable index data of the condensing loop and the average value in all air conditioning units, and displaying all variable index data of the condensing loop through a box graph;
the condensation index overview unit is used for providing comparative analysis of a plurality of variable index data of the condensation loop and checking the variable index data of a certain time period;
and the condensation history analysis unit is used for checking the variable index data change condition of the condensation loop of the current condensation loop in a certain period.
Fig. 1 is a data flow diagram of a health management system, a data transmission unit adopts a T2G (ERM) host, a T2G host on the same train adopts a high redundancy design, and the system has high-reliability real-time communication, meanwhile, only one T2G host communicates with a ground server, and the fault of any T2G host can not affect the transmission of the data reliability of the train to the ground server. When the network between the train and the wind path loop analysis module and the condensation loop analysis module is abnormal, the T2G (ERM) host automatically stores data, and automatically retransmits after network communication is recovered, namely the train has a breakpoint continuous transmission function, and in addition, the train T2G (ERM) host is communicated with the wind path loop analysis module and the condensation loop analysis module by adopting AES128 and MD5 encryption algorithms, so that the safety and reliability of communication data are ensured, and the communication data are not illegally acquired and cracked.
The method comprises the steps that an FTP communication protocol is adopted between a T2G (ERM) host and an air path loop analysis module and a condensing loop analysis module, the T2G host provides an FTP server function, data files of an air conditioning unit are received and stored in a designated directory, in addition, the T2G (ERM) host also provides an offline data validity verification service and a breakpoint continuous transmission function, the air path loop analysis module and the condensing loop analysis module build an FTP service, and the T2G serves as clients of the air path loop analysis module and the condensing loop analysis module, and uploads the files to the air path loop analysis module and the condensing loop analysis module through the FTP when the train returns.
The air path loop analysis module and the condensing loop analysis module are used as FTP clients to be connected with FTP servers of other systems, and files are uploaded. The air path loop analysis module and the condensation loop analysis module are not only the FTP server side of the T2G, but also the FTP client side of other systems.
When the T2G and the ground are used as clients to upload files, when the transmission is not completed, the MD5 verification mode verifies the integrity of the files, the files are changed into original file suffixes after the transmission is completed, and the file format is stored as any format suffixes.
And the MVB air conditioning system data is transmitted by the T2G in real time and is stored locally. If the transmission fails, the data can be read from the file for transmission after the network is restored. And the air path loop analysis module and the condensation loop analysis module receive MVB data and analyze and process the MVB data.
The wind path loop analysis module and the condensation loop analysis module perform health analysis through a health analysis model, give out corresponding maintenance strategies according to analysis results and threshold comparison analysis, and the health analysis model comprises one or more of a life cycle dynamic simulation model, a life cycle dynamic simulation scoring model, a dynamic difference analysis model for individual performance evaluation, an ARIMAX algorithm, a neural network model, a machine learning model and a traditional probability prediction and scoring model based on probability theory, wherein the health analysis model comprises a life cycle dynamic simulation model, a life cycle dynamic simulation scoring model, a dynamic difference analysis model for individual performance evaluation, an ARIMAX algorithm, a neural network model, a machine learning model and a traditional probability prediction and scoring model based on probability theory
The specific process of data cleaning comprises the following steps:
and receiving fault data of the air conditioning unit in real time, judging whether the fault needs to be reported or not according to data continuity, if so, transmitting fault information to the ground, carrying out real-time alarm and other processing, combining the fault on the machine side by matching fault processing modes, wherein different combined faults correspond to different processing modes, and the modes are automatically sequenced according to the fault.
The embodiment provides a train air conditioning unit health management system, including data acquisition processing module, wind path return circuit analysis module and condensation return circuit analysis module, the data acquisition processing module gathers various monitoring data that vehicle air conditioner operation process produced in real time, air conditioning system off-line data file is regularly passback, and realize ETL work on the limit, pass through ground wireless transmission to ground with the data result, wind path return circuit analysis module realizes the health evaluation and the index analysis that correspond of air conditioning wind path system, the health evaluation and the index analysis that correspond of condensation return circuit analysis module real-time vehicle air conditioning system, provide historical analysis to air conditioning system, find out the air conditioning system who has the problem, give the maintenance suggestion of air conditioning system of degree of depth analysis and corresponding different health degree has stability timeliness, the function is various, the intelligent advantage of data.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. The health management system applied to the vehicle air conditioning unit is characterized by comprising a data acquisition and processing module, an air path loop analysis module and a condensation loop analysis module;
the data acquisition processing module is used for acquiring variable index data of each air conditioning unit of the vehicle in real time and cleaning the data;
the air path loop analysis module is used for carrying out health analysis on the air path loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and the health index of the corresponding air path of the air conditioning unit meeting the conditions;
the condensing loop analysis module is used for carrying out health analysis on the condensing loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle, and inquiring the variable index data and health index of the corresponding condensing loop of the air conditioning unit meeting the conditions;
the data acquisition processing module comprises:
the data acquisition unit is used for acquiring variable index data of each air conditioning unit of the vehicle in real time;
the data cleaning unit is used for carrying out data calculation and cleaning on variable index data of each air conditioning unit of the vehicle;
the data transmission unit is used for transmitting the variable index data of each air conditioning unit of the vehicle after data calculation and cleaning to the air circuit analysis module and the condensation circuit analysis module;
the wind path loop analysis module comprises:
the system comprises an air path loop health analysis unit, a control unit and a control unit, wherein the air path loop health analysis unit is used for carrying out health analysis on an air path loop of each air conditioning unit according to variable index data of each air conditioning unit of a vehicle to generate an air path loop health analysis result;
the air path ranking distribution unit is used for generating variable index data ranking distribution conditions of the air path loop in the form of a chart;
the air path ranking subdivision unit is used for generating the description content of the variable index data ranking result of the air path loop in the form of a chart;
the air path index analysis unit is used for generating the comparison condition of a single variable index of the air path and the average value in all air conditioning units and the comparison analysis of the actual temperature and the average temperature, and displaying various variable index data of the air path through a box graph;
the air path index overview unit is used for providing comparative analysis of a plurality of variable index data of the air path and checking the variable index data of a certain time period;
the wind path history analysis unit is used for checking the change condition of the variable index data of the current wind path loop in a certain period;
the condensing loop analysis module comprises:
the condensing loop health analysis unit is used for carrying out health analysis on the condensing loop of each air conditioning unit according to the variable index data of each air conditioning unit of the vehicle to generate a condensing loop health analysis result;
the condensing ranking distribution unit is used for generating variable index data ranking distribution conditions of the condensing loop in the form of a chart;
the condensation ranking subdivision unit is used for generating the description content of the variable index data ranking result of the condensation loop in the form of a chart;
the condensing index analysis unit is used for generating the comparison condition of single variable index data of the condensing loop and the average value in all air conditioning units, and displaying all variable index data of the condensing loop through a box graph;
the condensation index overview unit is used for providing comparative analysis of a plurality of variable index data of the condensation loop and checking the variable index data of a certain time period;
and the condensation history analysis unit is used for checking the variable index data change condition of the condensation loop of the current condensation loop in a certain period.
2. The system of claim 1, wherein the data transmission unit is configured with redundancy.
3. The system of claim 1, wherein the data transmission unit communicates with the air circuit analysis module and the condensate circuit analysis module via AES128 and MD5 encryption algorithms.
4. The system of claim 1, wherein the wind circuit analysis module and the condensation circuit analysis module perform health analysis through a health analysis model, and the health analysis model includes one or more of a life cycle dynamic simulation model, a life cycle dynamic simulation scoring model, a dynamic difference analysis model of individual performance assessment, an ARIMAX algorithm, a neural network model, a machine learning model, and a traditional probability prediction and scoring model based on probability theory.
5. The system of claim 1, wherein the variable index data of the air duct comprises average return air, supply air, fresh air temperature, temperature combination difference and air duct health index.
6. The system of claim 1, wherein the variable index data of the condensing circuit comprises condensing temperature, suction temperature, discharge temperature, evaporating temperature, difference between condensing and discharge temperatures, difference between suction and evaporating temperatures, difference between discharge and suction temperatures, difference between evaporating and evaporating temperatures, difference between evaporating and condensing temperatures, and condensing circuit health index.
7. The health management system for a vehicle air conditioning unit according to claim 1, wherein the specific process of data cleaning comprises:
and receiving fault data of the air conditioning unit in real time, judging whether the fault needs reporting processing according to data continuity, if so, generating fault information, and carrying out real-time alarm processing.
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| CN203381634U (en) * | 2013-07-17 | 2014-01-08 | 青岛四方车辆研究所有限公司 | Repair line for air conditioners and air interchangers of motor train unit |
| JP2017132349A (en) * | 2016-01-27 | 2017-08-03 | パナソニックＩｐマネジメント株式会社 | Air-conditioning system for vehicle |
| CN109311489A (en) * | 2016-06-10 | 2019-02-05 | 三菱电机株式会社 | The clogging detecting system of air conditioner for vehicles and air conditioner for vehicles |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020107851A1 (en) * | 2018-11-29 | 2020-06-04 | 天津大学 | Low-cost commissioning method and system for air conditioning system based on existing large-scale public building |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203381634U (en) * | 2013-07-17 | 2014-01-08 | 青岛四方车辆研究所有限公司 | Repair line for air conditioners and air interchangers of motor train unit |
| JP2017132349A (en) * | 2016-01-27 | 2017-08-03 | パナソニックＩｐマネジメント株式会社 | Air-conditioning system for vehicle |
| CN109311489A (en) * | 2016-06-10 | 2019-02-05 | 三菱电机株式会社 | The clogging detecting system of air conditioner for vehicles and air conditioner for vehicles |
| CN209441371U (en) * | 2018-12-28 | 2019-09-27 | 金鑫美莱克空调系统（无锡）有限公司 | A kind of health monitoring systems for railway vehicle air conditioner system |
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