Passenger car air conditioner internal protection fault diagnosis device
By introducing detection, data processing, and display modules into the air conditioning system of railway passenger trains, and utilizing AD chips and FPGA main control chips for signal conversion and fault diagnosis, the problem of insufficient accuracy and efficiency in air conditioning fault diagnosis in existing technologies has been solved, achieving efficient and accurate fault judgment.
Patent Information
- Application Number
- CN202520626544.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-04
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-04-04
AI Technical Summary
In existing technologies, fault diagnosis of air conditioning pressure changes in railway passenger trains relies on high and low pressure mechanical switch sensors and clamp-on flow meters, which cannot accurately distinguish fault types, resulting in insufficient diagnostic accuracy and efficiency.
The system employs a detection module, a data processing module, and a display module. It acquires analog signals through a detection probe, performs analog-to-digital conversion using an AD chip, performs fault diagnosis in conjunction with an FPGA main control chip, and displays the results intuitively on the display module.
This improved the accuracy and efficiency of air conditioning fault diagnosis, reduced manpower consumption and misjudgment rate, and enhanced train operation quality and public credibility.
Smart Images
Figure CN223826437U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of railway passenger train air conditioning maintenance technology, and in particular to a fault diagnosis device for passenger train air conditioning internal protection. Background Technology
[0002] The maintenance technology for "air conditioning pressure change type" faults on conventional passenger trains mainly relies on high and low pressure mechanical switch sensors as the core detection method. These sensors employ pressure pin technology. When the pressure inside the air conditioning unit exceeds or falls below a set standard value, the pressure pin triggers the mechanical electrical signal switch within the sensor to open and close, generating a corresponding electrical signal to determine whether the internal pressure of the air conditioning unit is normal. These electrical signals are directly provided as instructions to the PLC (Programmable Logic Controller) or temperature controller, and the power supply circuit of the equipment is controlled to switch on and off via intermediate relays and control contactors. However, current PLCs and temperature controllers only have a single alarm display function and cannot distinguish the specific fault type and pressure change situation in detail. In addition, existing air conditioning maintenance technology also relies on using clamp-on current meters to measure the current value of the air conditioning compressor to estimate the internal pressure state of the air conditioner. This method is neither accurate enough nor can it provide detailed fault analysis information. Therefore, the current method has significant shortcomings in terms of accuracy and efficiency, making it difficult to meet the needs of efficient diagnosis and handling of air conditioning faults. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a fault diagnosis device for the internal protection of bus air conditioning, which realizes the analog-to-digital conversion of analog signals and displays the fault type together, serving as an important basis for judging the fault type of air conditioning cooling pressure change, and significantly improving the accuracy and efficiency of fault diagnosis.
[0004] This utility model embodiment provides a fault diagnosis device for the internal protection function of a bus air conditioning system, including: a detection module, a data processing module, and a display module; the detection module and the display module are respectively connected to the data processing module.
[0005] The detection module is used to detect the internal pressure of the air conditioning system and obtain a simulated signal;
[0006] The data processing module is used to process the analog signal to obtain the pressure value;
[0007] The data processing module includes a signal conversion unit and a fault diagnosis unit. The signal conversion unit is connected to both the detection module and the fault diagnosis unit, and the fault diagnosis unit is connected to the display module. The signal conversion unit receives analog signals and converts them to obtain pressure values. The fault diagnosis unit receives the pressure values, performs fault diagnosis, and sends the fault diagnosis results and pressure values to the display module to achieve the corresponding display of the fault diagnosis results and pressure values.
[0008] In another embodiment, the detection module includes a detection probe for detecting the internal pressure of the air conditioning system to obtain an analog signal, and sending the analog signal to a signal conversion unit to realize pressure value conversion.
[0009] In another embodiment, the signal conversion unit includes a detection chip, and the detection probe has an internal mounting space. The detection chip is installed inside the detection probe through the mounting space. After receiving the analog signal, the detection chip performs analog-to-digital conversion to obtain the pressure value, and transmits the pressure value to the fault diagnosis unit to achieve fault diagnosis.
[0010] In another embodiment, the fault diagnosis unit includes a development board and an FPGA main control chip mounted on the development board. The FPGA main control chip is used to receive pressure values to perform fault diagnosis and obtain fault diagnosis results.
[0011] In another embodiment, the data processing module further includes a transmission unit for transmitting the pressure value obtained by analog-to-digital conversion of the detection chip to the FPGA main control chip.
[0012] The transmission unit includes an extended I / O interface and a first connector. The extended I / O interface is set on the development board, and the first connector is connected to the corresponding pin of the FPGA main control chip. The first connector is provided with a coaxial connection port. The coaxial connection port of the first connector is connected to the detection chip through a signal transmission line to realize the electrical connection between the detection chip and the FPGA main control chip and transmit the pressure value to the FPGA main control chip.
[0013] In another embodiment, a second connector is also included. The second connector is disposed on the development board, and the display module is connected to the corresponding pin of the FPGA main control chip of the second connector to realize the electrical connection between the display module and the FPGA main control chip.
[0014] In another embodiment, a power supply module is also included for supplying power to the detection module, the data processing module, and the display module.
[0015] In another embodiment, the power supply unit for the detection probe includes a first power supply line and a second power supply line. The coaxial connector and the detection probe are connected via a coaxial signal line. The copper conductor inside the coaxial signal line transmits a +5V voltage. A metal braided mesh is attached to the outside of the coaxial signal line conductor, and the metal braided mesh is connected to the ground wire. The ground wire and the +5V voltage constitute the first power supply line for the detection probe. The development board is also provided with a connection contact point. The detection probe is electrically connected to the connection contact point via an input power supply line to form a second power supply line.
[0016] In another embodiment, the detection module further includes a connection interface, which is soldered to the refrigerant charging port of the air conditioning unit. The detection probe is connected to the connection interface to realize the detection probe and the refrigerant charging port of the air conditioning unit and realize the detection of analog signals.
[0017] This utility model embodiment brings the following beneficial effects: The bus air conditioning internal fault diagnosis device provided by this utility model embodiment transforms the original "high and low pressure mechanical switch sensor" into a "detection probe" connected to the refrigerant charging port of the air conditioning compressor. This probe detects the analog signal of the air conditioning pressure and converts it into a digital pressure value through a detection chip. This replaces the existing technique of estimating the internal pressure state of the air conditioning system by measuring the current value of the air conditioning compressor using a clamp meter, providing a high-precision pressure value for the fault detection process, thus enabling more accurate fault diagnosis results. Finally, the fault diagnosis result and its corresponding pressure value are displayed intuitively on the display module. The converted pressure value can serve as an important basis for judging the type of fault in air conditioning cooling pressure changes, eliminating the need for vehicle maintenance personnel to rely on personal experience and compare current values of multiple air conditioning units to deduce the cause of the fault in the original working mode. This greatly improves the accuracy of fault diagnosis by train maintenance personnel and reduces unnecessary repetitive work. The method of this application significantly improves accuracy and efficiency, meeting the needs of efficient diagnosis and handling of air conditioning faults.
[0018] This utility model significantly reduces manpower consumption, shortens fault diagnosis time, reduces the false fault rate, reduces the shortened lifespan of air conditioning units and damage to electrical components caused by improper handling, and saves maintenance costs caused by equipment damage due to improper use.
[0019] This utility model reduces the failure rate, improves the quality of train operation, provides passengers with an efficient, safe and comfortable travel environment, greatly enhances social credibility and expands influence, and provides reliable protection for the operation of train air conditioning equipment.
[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.
[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 Circuit diagram of the bus air conditioning internal protection fault diagnosis device provided in this embodiment of the utility model;
[0024] Figure 2 System block diagram of the signal conversion unit and fault diagnosis unit in the bus air conditioning internal protection fault diagnosis device provided in this embodiment of the utility model;
[0025] Figure 3 A circuit detail diagram of the bus air conditioning internal protection fault diagnosis device provided in this embodiment of the utility model. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] This utility model provides a fault diagnosis device for the internal protection of bus air conditioning, which can realize the analog-to-digital conversion of analog signals and display the fault type together. As an important basis for judging the fault type of air conditioning cooling pressure change, it significantly improves the accuracy and efficiency of fault diagnosis.
[0028] To facilitate understanding of this embodiment, the bus air conditioning internal protection fault diagnosis device disclosed in this utility model embodiment will first be described in detail. Figure 1 This invention illustrates a system block diagram of the signal conversion unit and the fault diagnosis unit in the bus air conditioning internal protection fault diagnosis device provided in an embodiment of the present invention, as shown below. Figure 1As shown, the bus air conditioning internal fault diagnosis device includes a detection module, a data processing module, and a display module 20; the detection module and the display module 20 are respectively connected to the data processing module. The detection module is used to detect the internal pressure of the air conditioning system and obtain an analog signal; the data processing module is used to process the analog signal to obtain a pressure value; wherein, the data processing module includes a signal conversion unit and a fault diagnosis unit, the signal conversion unit being connected to the detection module and the fault diagnosis unit respectively, and the fault diagnosis unit being connected to the display module 20; the signal conversion unit is used to receive the analog signal and perform signal conversion to obtain the pressure value; the fault diagnosis unit is used to receive the pressure value, perform fault diagnosis, and send the fault diagnosis result and the pressure value to the display module 20 to achieve the corresponding display of the fault diagnosis result and the pressure value.
[0029] The analog signal is a pressure signal.
[0030] Among them, "internal protection" refers to the internal pressure protection of the air conditioner. It is the air conditioner's self-protection mechanism triggered by changes in the internal refrigerant pressure, which generates a fault alarm.
[0031] This application, through the cooperation of a detection module, a data processing module, and a display module 20, achieves real-time monitoring of the internal pressure of an air conditioning system and displays the results of fault diagnosis. The detection module detects the internal pressure of the air conditioning system and obtains an analog signal. The data processing module includes a signal conversion unit and a fault diagnosis unit. The signal conversion unit converts the analog signal into a pressure value, and the fault diagnosis unit receives the pressure value, performs fault diagnosis, and sends the fault diagnosis result and the pressure value to the display module 20. The display module 20 displays the fault diagnosis result and the pressure value. Through the above technical means, this device can effectively solve the problem of internal pressure detection and fault diagnosis in air conditioning systems, improving the accuracy and efficiency of fault diagnosis.
[0032] In another embodiment, the detection module includes a detection probe 30 for detecting the internal pressure of the air conditioning system to obtain an analog signal, and sending the analog signal to a signal conversion unit to realize pressure value conversion.
[0033] The detection probe 30 can employ various types of pressure sensors, such as piezoelectric, strain gauge, or capacitive sensors. These sensors can accurately sense pressure changes within the air conditioning system and generate corresponding analog signals. Considering that ordinary pressure sensors can only acquire pressure signals and have relatively limited functionality, this embodiment preferably uses a pressure transmitter, model RS485, with a pressure range of 0–4 MPa, output signal of DC 0.5–2.5V, power supply voltage of DC 5V, and withstand pressure of 100 MPa.
[0034] In another embodiment, the detection probe 30 is used in the repair technology of "air conditioning pressure change type" faults. The detection probe 30 is preferably installed inside the refrigerant charging port of the air conditioning unit to detect the pressure inside the air conditioner and the air conditioning compressor. Further, the detection module also includes a connection interface, which is welded to the refrigerant charging port of the air conditioning unit. The detection probe 30 is connected to the connection interface, enabling the detection probe 30 to connect to the refrigerant charging port of the air conditioning unit and detect analog signals. Even further, the connection interface is a 4-point external threaded copper interface, and the detection probe 30 is provided with a 4-point internal threaded interface. The detection probe 30 is inserted into and connected to the refrigerant charging port of the air conditioning unit through the threaded connection of the two threaded interfaces, facilitating pressure detection.
[0035] This invention preferably places the detection probe 30 inside the refrigerant charging port of the air conditioning unit for precise pressure detection of the air conditioning system and its compressor. The main advantage of installing the detection probe 30 inside the charging port is a significant improvement in the accuracy and real-time performance of pressure measurement. First, as a critical node for refrigerant entry and exit, the pressure changes inside the charging port directly reflect the operating status and performance of the air conditioning system, allowing the probe to capture pressure data closest to actual operating conditions. Second, this placement avoids the influence of external environmental factors (such as temperature fluctuations and humidity changes) on sensor readings, ensuring data consistency and stability. Furthermore, installing the probe inside the charging port simplifies the overall system layout, reduces additional piping connections and sealing issues, and improves system reliability and maintenance convenience. This approach not only achieves high-precision monitoring of internal pressure changes in the air conditioning system but also provides solid data support for timely detection and resolution of potential faults, thereby greatly improving maintenance efficiency and the operational safety of the air conditioning system. This design optimization is particularly suitable for scenarios requiring frequent monitoring and adjustments, such as the daily maintenance and troubleshooting of train air conditioning systems.
[0036] In another embodiment, a thermo-welding process using acetylene and oxygen as welding materials is employed. A synthetic welding rod with a main body containing 75% silver is used to weld a 4-point copper external threaded connector into the copper pipeline of the air conditioning unit at the refrigerant charging port. Then, an RS485 pressure transmitter with a 4-point internal threaded connector is installed on the newly welded 4-point external threaded connector to achieve the installation and fixation of the detection probe 30.
[0037] In another embodiment, the signal conversion unit includes a detection chip, and the detection probe 30 has an internal mounting space. The detection chip is installed inside the detection probe 30 through the mounting space. After receiving the analog signal, the detection chip performs analog-to-digital conversion to obtain the pressure value and transmits the pressure value to the fault diagnosis unit to realize fault diagnosis.
[0038] In another embodiment, the detection chip is preferably an AD chip, which is used for analog-to-digital conversion of analog signals. There can be one or more AD chips; when there are multiple AD chips, only one is used for analog-to-digital conversion, while the others remain idle.
[0039] An AD chip is an integrated circuit specifically designed to convert analog signals into digital signals. In this application, the AD chip is responsible for receiving analog pressure signals from the detection probe 30 and converting them into digital signals for subsequent data processing and analysis. More preferably, the AD chip is a dual-channel high-speed AD analog-to-digital converter module, which includes not only the AD chip itself but may also include other auxiliary circuits and components, such as power management, filters, and amplifiers, to ensure that analog signals can be accurately converted into digital signals and that these digital signals can be stably transmitted to the data processing unit. Dual-channel high-speed AD analog-to-digital converter module: power supply voltage: DC 5V, analog voltage conversion range: -5V to +5V, data width: 10 bits, conversion rate: 50MSPS, first connector: female IDC interface (2X20Pin, 2.54mm pitch).
[0040] In another embodiment, the fault diagnosis unit includes a development board and an FPGA main control chip 10 mounted on the development board. The FPGA main control chip 10 is used to receive pressure values for fault diagnosis and obtain fault diagnosis results. The development board is preferably a SPARTAN-6 small system development board, with the chip model being SPARTAN-6 series XC6SLX16-2FTG256C. Most preferably, the FPGA main control chip 10 is model XC6SLX16. Logic Cell: 14579, DSP Slices: 32, Power Supply: DC 3.3V, Board Technology: Class A PCB with immersion gold plating.
[0041] In another implementation, this embodiment only provides the pressure value and transmits it to the FPGA main control chip 10. Simultaneously, data such as air conditioner current and outdoor temperature are collected and transmitted to the FPGA main control chip 10 using transmitters installed in the original air conditioner system. The FPGA main control chip 10 performs data analysis on the air conditioner current, outdoor temperature, and pressure value to achieve fault diagnosis. The process of collecting air conditioner current, outdoor temperature, and other data is existing technology and will not be described in detail in this embodiment.
[0042] In another implementation, such as Figure 2As shown, the data processing module further includes a transmission unit for transmitting the pressure value obtained by analog-to-digital conversion from the detection chip to the FPGA main control chip 10. The transmission unit includes an expansion I / O interface and a first connector. The expansion I / O interface is mounted on the development board, with at least two interfaces positioned before and after it. The first connector is connected to a corresponding pin of the FPGA main control chip 10. The first connector has a coaxial connection port, which is connected to the detection chip via a signal transmission line to achieve electrical connection between the detection chip and the FPGA main control chip 10, and to transmit the pressure value to the FPGA main control chip 10.
[0043] Specifically, the FPGA main control chip 10 and the AD chip are electrically connected by inserting the first connector into the pin corresponding to the FPGA main control chip 10 on the expansion I / O interface. The AD module receives the analog signal transmitted by the detection probe 30, performs analog-to-digital conversion internally, and transmits the converted digital signal to the FPGA pin. The FPGA's internal logic analyzer then captures the data and presents the external analog signal.
[0044] Compared to existing technologies, this design offers significant advantages: First, using an FPGA as the main control chip provides higher data processing speed and parallel processing capabilities, enabling real-time processing of large amounts of sensor data. Second, the coaxial connector design not only improves signal transmission stability and anti-interference capabilities but also simplifies wiring complexity and reduces the impact of electromagnetic interference on signals. Furthermore, multiple expansion I / O interfaces provide more connection options, enhancing the system's scalability and flexibility, facilitating future functional expansion or upgrades. Overall, this optimized design not only improves the reliability and efficiency of data transmission but also significantly enhances the overall system performance and adaptability, making fault diagnosis more accurate and timely, effectively shortening fault diagnosis time, reducing the false alarm rate, and providing strong technical support for the maintenance of train air conditioning systems.
[0045] In another embodiment, the first connector is a pin connector.
[0046] The core of the FPGA main control chip 10 is responsible for running a pre-written fault diagnosis algorithm. Multiple pressure thresholds are set, and when the detected pressure value exceeds or falls below these thresholds, a corresponding alarm signal is triggered. By analyzing the pressure values over a continuous time period, it determines whether there are abnormal trends (e.g., a sudden drop or rise in pressure). Using machine learning or a pre-defined fault mode library, the current pressure data is matched to determine the specific fault type. The fault diagnosis process is mainly implemented through code. In this embodiment, only the pressure value needs to be transmitted to the FPGA main control chip 10 to obtain the fault type; this part is not an improvement of this embodiment and will not be described in detail here.
[0047] In another embodiment, a second connector is also included. The second connector is disposed on the development board, and the display module 20 is connected to the corresponding pin of the FPGA main control chip 10 of the second connector to realize the electrical connection between the display module 20 and the FPGA main control chip 10.
[0048] In another embodiment, the display module 20 is an LCD liquid crystal display screen, preferably a 4.3-inch RGB capacitive touch LCD screen, with serial port connection: parallel 24-bit RGB interface, color depth: 24-bit color (1600w), resolution: 800×480, touch type: capacitive, and touch points: up to five points of simultaneous touch.
[0049] In another implementation, to display the fault type and stress value of the FPGA main control chip 10 on the screen, an RGB LCD connector is preferably used as the second connector and mounted on the development board. The specific implementation steps are as follows:
[0050] First, the RGB LCD connector is electrically connected to the corresponding pins of the FPGA main control chip 10 via a pin header, ensuring the stability and efficiency of data transmission. The RGB LCD connector on the development board has a 24-bit color data bus (RGB888 format), corresponding to 8-bit data channels for red, green, and blue respectively. These channels are directly connected to the RGB interface of the display module 20 via a pin header. Second, the FPGA main control chip 10 integrates the LCD driver module and the LCD display module 20. The LCD driver module is responsible for generating synchronization signals (such as horizontal synchronization signal HSYNC and vertical synchronization signal VSYNC) and pixel clock signals (PCLK) that meet the timing requirements of the display screen, and converting the processed fault diagnosis results and pressure values into a digital signal format suitable for display. The LCD display module 20 then draws the fault type and pressure value on the screen in text or graphic form according to the current pixel position information.
[0051] Specifically, in the program design, the FPGA main control chip 10 first receives the pressure value from the AD analog-to-digital converter module and determines whether a fault exists and its specific type using a pre-written fault diagnosis algorithm. Then, it packages the fault type and pressure value into frame data and generates corresponding control signals (such as the DE signal for data enable, and HSYNC and VSYNC signals for synchronization) through the LCD driver module. Next, the LCD display module 20 scans and updates the display content line by line based on the received control and data signals. For example, a specific area can be set to display the current pressure value, while another area displays the fault diagnosis results (such as "high pressure warning," "low pressure warning," etc.). To improve the user experience, other auxiliary information, such as timestamps and historical records, can be added to the display. In this way, the FPGA main control chip 10 can display the fault type and pressure value on the display in real time and accurately, providing intuitive fault information for maintenance personnel, thereby significantly improving the maintenance efficiency and accuracy of the air conditioning system.
[0052] In another embodiment, the pin connector is preferably a flexible pin connector.
[0053] In another implementation, to better adapt to complex working environments and improve the overall performance of the detection probe 30, the internal structure of the detection probe 30 was optimized. Specifically, a special mounting space protruding outwards on both sides is provided inside the detection probe 30. The main purpose of this design is to provide sufficient physical space for the AD chip. As the core component for converting analog signals to digital signals, the performance of the AD chip directly affects the final pressure measurement accuracy and response speed. The outward protrusion design allows for a more rational layout of the AD chip, reducing electromagnetic interference with other electronic components and ensuring the purity of signal transmission. In addition, the larger mounting space also makes it possible to select a higher-performance AD chip, further improving signal processing capabilities and measurement accuracy. For example, using a dual-channel high-speed AD analog-to-digital conversion module can achieve rapid data acquisition and processing while ensuring high accuracy, which is crucial for real-time monitoring of internal pressure changes in air conditioning systems.
[0054] Figure 3 A circuit detail diagram of the bus air conditioning internal protection fault diagnosis device provided in this embodiment of the utility model. Figure 3As shown, by combining an AD analog-to-digital converter module and a high-performance sensor, the system can achieve high-precision data acquisition and processing, ensuring the accuracy of measurement results. The high-speed processing power and flexible programming characteristics of the FPGA enable the system to quickly respond to changes in the external environment and provide real-time data feedback. The introduction of an LCD screen makes system operation more intuitive and convenient, allowing users to easily view and understand the system status, thus improving the overall user experience. Based on the FPGA design, the system has high flexibility and scalability, and can be adjusted and optimized according to different application scenarios to meet diverse needs.
[0055] In another embodiment, the data processing module further includes a power supply unit for the detection probe 30, used to continuously supply power to the detection probe 30. The power supply unit for the detection probe 30 includes a first power supply line and a second power supply line. The coaxial connector and the detection probe 30 are connected via a coaxial signal line. The copper conductor within the coaxial signal line core transmits a +5V voltage. A metal braided mesh is attached to the outside of the coaxial signal line conductor, connecting the metal braided mesh to a ground wire. The ground wire and the +5V voltage constitute the first power supply line for the detection probe 30. The development board also has connection contacts, and the detection probe 30 is electrically connected to these contact points via an input power supply line to form a second power supply line.
[0056] In another embodiment, a power supply module 40 is also included to power the detection module, data processing module, and display module 20. The power supply module 40 provides power to the entire circuit through a specific power supply path and establishes two independent but complementary power supply lines with the detection probe 30 to ensure its normal operation. First, the power supply module 40 (DC 5V) enters the system through a USB interface or directly connected to the battery input port on the development board. Then, it undergoes voltage regulation and filtering by the internal power management module to ensure a stable and clean voltage is provided to various components such as the FPGA main control chip 10, the AD analog-to-digital converter module, and the display module 20. The power supply to the detection probe 30 includes two logically complementary power supply lines: the first is implemented through a coaxial cable, where the core wire of the coaxial cable transmits +5V voltage, while the outer metal braided mesh is used as a ground wire, forming the probe's first power supply loop; the second is established through additional connection points and input power lines on the development board, which also provides +5V voltage to the probe, forming the second power supply loop. The two power supply lines work together to ensure that the probe can obtain a stable power supply under any circumstances. They also enhance the redundancy and reliability of the system, so that even if one line fails, the other line can still maintain the basic function of the probe, thereby ensuring the continuous and stable operation of the entire air conditioning internal protection fault diagnosis device.
[0057] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A fault diagnosis device for the internal protection function of a bus air conditioner, characterized in that, It includes a detection module, a data processing module, and a display module; the detection module and the display module are respectively connected to the data processing module; The detection module is used to detect the internal pressure of the air conditioning system and obtain a simulated signal; The data processing module is used to process the analog signal to obtain the pressure value; The data processing module includes a signal conversion unit and a fault diagnosis unit. The signal conversion unit is connected to both the detection module and the fault diagnosis unit, and the fault diagnosis unit is connected to the display module. The signal conversion unit receives analog signals and converts them to obtain pressure values. The fault diagnosis unit receives the pressure values, performs fault diagnosis, and sends the fault diagnosis results and pressure values to the display module to achieve the corresponding display of the fault diagnosis results and pressure values.
2. The bus air conditioning internal protection fault diagnosis device according to claim 1, characterized in that, The detection module includes a detection probe for detecting the internal pressure of the air conditioning system to obtain an analog signal, and sending the analog signal to a signal conversion unit to convert the pressure value.
3. The bus air conditioning internal protection fault diagnosis device according to claim 2, characterized in that, The signal conversion unit includes a detection chip. The detection probe has an internal mounting space, and the detection chip is installed inside the detection probe through the mounting space. After receiving the analog signal, the detection chip performs analog-to-digital conversion to obtain the pressure value, and transmits the pressure value to the fault diagnosis unit to achieve fault diagnosis.
4. The bus air conditioning internal protection fault diagnosis device according to claim 3, characterized in that, The fault diagnosis unit includes a development board and an FPGA main control chip mounted on the development board. The FPGA main control chip is used to receive pressure values to perform fault diagnosis and obtain fault diagnosis results.
5. The bus air conditioning internal protection fault diagnosis device according to claim 1, characterized in that, The data processing module also includes a transmission unit, which is used to transmit the pressure value obtained by analog-to-digital conversion of the detection chip to the FPGA main control chip; The transmission unit includes an extended I / O interface and a first connector. The extended I / O interface is set on the development board, and the first connector is connected to the corresponding pin of the FPGA main control chip. The first connector is provided with a coaxial connection port. The coaxial connection port of the first connector is connected to the detection chip through a signal transmission line to realize the electrical connection between the detection chip and the FPGA main control chip and transmit the pressure value to the FPGA main control chip.
6. The bus air conditioning internal protection fault diagnosis device according to claim 1, characterized in that, It also includes a second connector, which is mounted on the development board. The display module is connected to the corresponding pin of the FPGA main control chip of the second connector to realize the electrical connection between the display module and the FPGA main control chip.
7. The bus air conditioning internal protection fault diagnosis device according to claim 1, characterized in that, It also includes a power supply module for supplying power to the detection module, data processing module, and display module.
8. The bus air conditioning internal protection fault diagnosis device according to claim 5, characterized in that, The data processing module also includes a power supply unit for the detection probe, which provides continuous power to the detection probe.
9. The bus air conditioning internal protection fault diagnosis device according to claim 8, characterized in that, The power supply unit for the detection probe includes a first power supply line and a second power supply line. The coaxial connector and the detection probe are connected by a coaxial signal line. The copper wire inside the coaxial signal line core transmits +5V voltage. The coaxial signal line wire is covered with a metal braided mesh, which is connected to the ground wire. The ground wire and the +5V voltage constitute the first power supply line for the detection probe. The development board is also equipped with a connection contact point. The detection probe is electrically connected to the connection contact point through the input power supply line to form a second power supply line.
10. The bus air conditioning internal protection fault diagnosis device according to claim 2, characterized in that, The detection module also includes a connection interface, which is soldered to the refrigerant charging port of the air conditioning unit. The detection probe is connected to the connection interface to realize the detection probe and the refrigerant charging port of the air conditioning unit and realize the detection of analog signals.