Air cylinder pressure acquisition plug-in unit of urban rail transit engineering vehicle

Abstract

The utility model relates to the technical field of urban rail transit engineering vehicle equipment, in particular to an urban rail transit engineering vehicle air cylinder pressure acquisition plug-in which comprises a power supply part, a pressure signal sampling module, a pressure channel selection module, an AD conversion module, a signal isolation module, a main control module and a communication module. The power supply part is used for realizing various power supply conversion and protection functions and supplying power to other modules; the pressure signal sampling module is used for carrying out operational amplification processing on 0-5V voltage signals output by the voltage type pressure sensor; the pressure channel selection module is used for selecting five paths of pressure signals and pressure self-checking signals under the control of the CPU; the AD conversion module is used for converting the pressure signal into a digital signal; the signal isolation module is used for realizing isolation between a pressure signal and a main circuit; the stability of the air cylinder pressure acquisition data of the urban rail transit engineering vehicle can be improved.

Description

Technical Field

[0001] This application relates to the field of urban rail transit engineering vehicle equipment technology, and in particular to a pressure acquisition plug for an air cylinder of an urban rail transit engineering vehicle. Background Technology

[0002] In urban rail transit systems, the safe and stable operation of engineering vehicles is of paramount importance. The urban rail transit engineering vehicle operation monitoring host, as the core equipment of the operation monitoring system, undertakes the crucial task of collecting various vehicle information and controlling train operation accordingly. Among these, the accurate acquisition of air cylinder pressure information is of great significance to the safe operation of the engineering vehicles.

[0003] Currently, the monitoring host for urban rail transit engineering vehicles has many shortcomings in terms of air cylinder pressure acquisition. On the one hand, the number of acquisition channels is limited. Existing monitoring hosts typically only provide two pressure acquisition channels: train pipe pressure and brake cylinder pressure. They cannot obtain important data such as total air cylinder pressure, I-end equalization air cylinder pressure, and II-end equalization air cylinder pressure. This makes it difficult for drivers to fully grasp the pressure status of the vehicle's air cylinders and make accurate decisions under complex operating conditions.

[0004] On the other hand, there are serious problems with the accuracy of the data acquisition. In field applications, the acquired cylinder pressure values ​​have large errors, fluctuating frequently within a range of ±30 kPa and failing to remain stable. This makes it impossible for the driver to accurately know the cylinder pressure value of the engineering vehicle, increasing operational difficulty and safety risks. For example, during braking operations, inaccurate pressure data may prevent the driver from controlling the braking force in a timely and accurate manner, thus affecting the train's braking performance and potentially even causing a safety accident.

[0005] Furthermore, the existing data acquisition module lacks necessary protection functions. The module lacks overvoltage, undervoltage, and overcurrent protection, making it highly susceptible to burnout when the external power supply voltage is abnormal. This not only causes the cylinder pressure acquisition function to fail but may also damage the entire operation monitoring system, affecting train operation and increasing maintenance costs and downtime.

[0006] In summary, the existing methods for acquiring cylinder pressure in urban rail transit engineering vehicles can no longer meet the requirements for safe and efficient operation of these vehicles, and there is an urgent need for a new type of cylinder pressure acquisition plug-in that can solve the above problems. Utility Model Content

[0007] To improve the stability of air cylinder pressure acquisition data from urban rail transit engineering vehicles, this application provides an air cylinder pressure acquisition plug-in for urban rail transit engineering vehicles.

[0008] This application provides a pressure acquisition module for a wind cylinder in an urban rail transit engineering vehicle, employing the following technical solution: It includes a power supply section, a pressure signal sampling module, a pressure channel selection module, an AD conversion module, a signal isolation module, a main control module, and a communication module. The power supply section is used to implement various power conversion and protection functions, providing power to other modules. The pressure signal sampling module is used to perform operational amplification processing on the 0-5V voltage signal output by the voltage-type pressure sensor. The pressure channel selection module is used to select five pressure signals and a pressure self-test signal under CPU control. The AD conversion module is used to convert the pressure signal into a digital signal. The signal isolation module is used to isolate the pressure signal from the main circuit. The main control module is used to communicate with the main control recording module and report the acquired pressure signal values. The communication module is used to interact with the main control recording module for data exchange.

[0009] Optionally, the power supply section includes an input power protection circuit, which uses an LTC4281 chip to implement hot-plugging, overvoltage, undervoltage, and overcurrent protection for the DC24V input power supply. The overvoltage thresholds are UOVH = 30.9V and UOVL = 28.3V; the undervoltage thresholds are UUVH = 17.6V and UUVL = 19.8V; and the overcurrent threshold is I = 1.25A.

[0010] Optionally, the power supply section also includes a DC3.3V power conversion circuit, which converts DC24V to DC5V via DC / DC converter, and then to DC3.3V via LDO converter.

[0011] Optionally, the power supply section also includes a DC15V power conversion circuit, which converts DC24V to DC / DC power to provide DC15V power to the voltage-type pressure sensor and pressure signal processing circuit.

[0012] Optionally, the pressure signal sampling module amplifies the 0-5V voltage signal output by the voltage-type pressure sensor and outputs a voltage range of 0-2.5V.

[0013] Optionally, the pressure channel selection module uses a multi-channel analog switch ADG1611 to select the pressure acquisition channel under CPU control.

[0014] Optionally, the AD conversion module uses an ADS1286 chip as an analog-to-digital converter with a sampling frequency of 20kHz, and its reference voltage is provided by TI's REF3040 converter.

[0015] Optionally, the signal isolation module uses ADI's digital isolation chip ADUM5402, which has an isolation voltage of up to 2.5kV and a data transmission rate of 25Mbps.

[0016] Optionally, the main control module uses GD32F407VGT6 from GD Corporation as the main control CPU, and communicates with the main control recording plug-in through a 2-channel CAN bus.

[0017] Optionally, the communication module uses an external ADI ADM3053BRWZCAN transceiver chip via the CAN interface built into the main control CPU to achieve data interaction with the main control recording plug-in.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] By processing the pressure signal through an operational amplifier circuit, interference from external common-mode signals is effectively suppressed, loop stability is improved, and the error range of the pressure value is reduced to ±10kPa. Compared with existing technologies, the acquisition accuracy is significantly improved, and the cylinder pressure value can be displayed on the screen in real time with high precision and stability. This provides the driver with accurate pressure information, facilitating precise vehicle control and improving the safety and reliability of the engineering vehicle operation.

[0020] A dual-channel CAN communication redundancy design is adopted to ensure reliable forwarding of the acquired pressure signal data and avoid data loss. Even if one CAN communication channel fails, the other can still operate normally, ensuring the continuity and stability of data transmission and further enhancing the reliability of the system.

[0021] The power supply section is equipped with input power protection, which can effectively cope with abnormal external power supply voltage, prevent the plug-in from being damaged by overvoltage, undervoltage, or overcurrent, improve the stability and service life of the plug-in, and reduce maintenance costs and train downtime caused by plug-in damage.

[0022] Adopting a standard plug-in design, it is easy to install in the ISM main unit chassis. The standardized and lightweight structural design not only reduces costs, but also facilitates large-scale production and application promotion of the product, thereby improving the product's market competitiveness. Attached Figure Description

[0023] Figure 1 This is a hardware architecture diagram of this application;

[0024] Figure 2 This is the circuit diagram for input power protection in this application;

[0025] Figure 3 This is a circuit diagram of the DC 3.3V power conversion of the system power supply in this application;

[0026] Figure 4 This is a circuit diagram of the DC 3.3V power supply of the system in this application converted by an LDO;

[0027] Figure 5This is a circuit diagram of the pressure signal processing circuit in this application;

[0028] Figure 6 This is a circuit diagram of the analog signal processing circuit in this application;

[0029] Figure 7 This is a circuit diagram of the pressure signal sampling module in this application;

[0030] Figure 8 This is a circuit diagram of the pressure acquisition channel self-test module in this application;

[0031] Figure 9 This is a circuit diagram of the pressure channel selection module in this application;

[0032] Figure 10 This is a circuit diagram of the AD conversion module in this application;

[0033] Figure 11 This is a circuit diagram of the signal isolation module in this application;

[0034] Figure 12 This is the circuit of the main control module in this application. Figure 1 ;

[0035] Figure 13 This is the circuit of the main control module in this application. Figure 2 ;

[0036] Figure 14 This is a circuit diagram of the communication module in this application. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-14 This application will be described in further detail.

[0038] This application discloses a plug-in for acquiring air cylinder pressure in an urban rail transit engineering vehicle. For example... Figure 1-14As shown, the system includes a power supply section, a pressure signal sampling module, a pressure channel selection module, an AD conversion module, a signal isolation module, a main control module, and a communication module. The power supply section provides power to other modules by implementing various power conversion and protection functions. The pressure signal sampling module amplifies the 0-5V voltage signal output from the voltage-type pressure sensor. The pressure channel selection module selects five pressure signals and a pressure self-test signal under CPU control. The AD conversion module converts the pressure signal into a digital signal. The signal isolation module isolates the pressure signal from the main circuit. The main control module communicates with the main control recording module and reports the collected pressure signal values. The communication module interacts with the main control recording module for data exchange. The power supply section includes an input power protection circuit, which uses an LTC4281 chip to provide hot-swap, overvoltage, undervoltage, and overcurrent protection for the DC 24V input power. The overvoltage thresholds are UOVH = 30.9V and UOVL = 28.3V; the undervoltage thresholds are UUVH = 17.6V and UUVL = 19.8V; and the overcurrent threshold is I = 1.25A. The power supply section also includes a DC 3.3V power conversion circuit, which converts DC 24V to DC 5V via a DC / DC converter, and then to DC 3.3V via an LDO. The power supply section also includes a DC 15V power conversion circuit, which converts DC 24V to DC 15V via a DC / DC converter to provide power to the voltage-type pressure sensor and pressure signal processing circuit.

[0039] In one embodiment, as shown in the accompanying drawings, the pressure signal sampling module amplifies the 0-5V voltage signal output by the voltage-type pressure sensor, resulting in an output voltage range of 0–2.5V. The pressure channel selection module employs a multiplexer ADG1611 to select the pressure acquisition channel under CPU control.

[0040] In one embodiment, as shown in the accompanying drawings, the AD conversion module uses an ADS1286 chip as an analog-to-digital converter with a sampling frequency of 20kHz, and its reference voltage is provided by a TI REF3040 converter. The signal isolation module uses an ADI ADUM5402 digital isolation chip with an isolation voltage of up to 2.5kV and a data transmission rate of 25Mbps.

[0041] In one embodiment, as shown in the accompanying drawings, the main control module uses GD32F407VGT6 from GD Corporation as the main control CPU, and communicates with the main control recording module via a two-channel CAN bus. The communication module uses an external ADM3053BRWZCAN transceiver chip from Analog Devices (ADI) through the CAN interface built into the main control CPU to achieve data interaction with the main control recording module.

[0042] The implementation principle of the pressure acquisition plug-in for the air cylinder of an urban rail transit engineering vehicle according to an embodiment of this application is as follows: 1. Pressure signal acquisition: When the engineering vehicle is running, five pressure sensors monitor the train pipe pressure, brake cylinder pressure, main air cylinder pressure, I-end equalizing air cylinder pressure, and II-end equalizing air cylinder pressure in real time, and convert the pressure signals into voltage signals of 0-5V and output them to the pressure signal sampling module. The pressure signal sampling module performs amplification processing on these voltage signals and adjusts the output voltage to the range of 0-2.5V to improve signal quality.

[0043] Channel Selection and Self-Test: Under the control of the main CPU, the pressure channel selection module sequentially selects five pressure signals and pressure self-test signals via the ADG1611 multi-channel analog switch. Simultaneously, the pressure acquisition channel self-test module detects the DC 5V voltage signal, processes it through an operational amplifier, and samples it using an analog-to-digital converter before sending the self-test signal to the CPU. The CPU uses the self-test signal to determine if the pressure signal acquisition channel is functioning correctly; if any abnormality is detected, it promptly handles the fault.

[0044] Signal Conversion and Isolation: The selected pressure signal enters the AD conversion module, where the ADS1286 chip converts it into a digital signal. The converted digital signal is then isolated from the main circuit in the signal isolation module by the ADUM5402 digital isolation chip to prevent signal interference and ensure accurate data transmission.

[0045] Data Communication and Processing: After receiving digital signals, the main control module, upon receiving a query from the main control recording module, reports the collected pressure signal values ​​to the main control recording module via a two-channel CAN communication circuit. The ADM3053BRWZ CAN transceiver chip in the communication module is responsible for ensuring reliable data transmission, uploading the collected pressure signals, and receiving instructions from the main control recording module. After processing the received data, the main control recording module sends the cylinder pressure values ​​to the display. The driver can view the accurate and stable cylinder pressure values ​​in real time on the display to control the engineering vehicle according to the pressure conditions.

[0046] Protection function operation: Throughout the entire use process, the LTC4281 chip in the power supply section continuously monitors the input DC24V power supply. When overvoltage, undervoltage or overcurrent occurs, the protection function is activated in time to prevent the module from being damaged due to abnormal power supply and ensure stable operation of the module.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressure acquisition plug for air cylinders in urban rail transit engineering vehicles, installed inside the ISM main unit box, characterized in that, It includes a power supply section for implementing various power conversion and protection functions and supplying power to other modules; a pressure signal sampling module for operational amplification of the 0-5V voltage signal output by the voltage-type pressure sensor; a pressure channel selection module for selecting 5 pressure signals and pressure self-test signals under CPU control; an AD conversion module for converting pressure signals into digital signals; a signal isolation module for isolating pressure signals from the main circuit; a main control module for communicating with the main control recording plug-in and reporting the collected pressure signal values; and a communication module for data interaction with the main control recording plug-in.

2. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The power supply section includes an input power protection circuit, which includes an LTC4281 chip. The input power protection circuit has overvoltage thresholds UOVH = 30.9V; UOVL = 28.3V; undervoltage thresholds UUVH = 17.6V; UUVL = 19.8V; and overcurrent threshold I = 1.25A.

3. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The power supply section also includes a DC 3.3V power conversion circuit.

4. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The power supply section also includes a DC15V power conversion circuit.

5. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The pressure signal sampling module amplifies the 0-5V voltage signal output by the voltage-type pressure sensor and outputs a voltage range of 0-2.5V.

6. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The pressure channel selection module uses a multi-channel analog switch ADG1611.

7. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The AD conversion module uses the ADS1286 chip as an analog-to-digital converter with a sampling frequency of 20kHz.

8. The pressure acquisition plug for the air cylinder of an urban rail transit engineering vehicle according to claim 1, characterized in that, The signal isolation module uses ADI's ADUM5402 digital isolation chip, with an isolation voltage of up to 2.5kV and a data transmission rate of 25Mbps.

9. A pressure acquisition plug for air cylinders in urban rail transit engineering vehicles according to claim 1, characterized in that, The main control module uses GD32F407VGT6 from GD Corporation as the main control CPU.

10. A pressure acquisition plug for air cylinders in urban rail transit engineering vehicles according to claim 1, characterized in that, The communication module uses an external ADI ADM3053BRWZCAN transceiver chip via the CAN interface built into the main control CPU.

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