CR200J motor train unit pressure sensor verification tool

Abstract

The utility model discloses a CR200J motor train unit pressure sensor verification tool, and relates to the field of railway transportation. The tool is composed of a power source, a single-chip microcomputer system board, an LCD screen, an I / V and V / I conversion and buffer circuit, an interface, a connecting line, a shell and the like, after the tool is powered on to enter a working state, under the control of a single-chip microcomputer, a CR200J motor train unit pressure sensor signal is received through a sensor interface, the pipeline wind pressure is displayed on the LCD screen in real time through the conversion circuit, and the pipeline wind pressure is displayed in real time. Judging whether the function of the pressure sensor of the CR200J motor train unit is normal or not by comparing the actual wind pressure of the train with the display; and the signal output of a CR200J motor train unit pressure sensor can be simulated through a host interface, and different wind pressure values are simulated and output through a wind pressure adjusting button to be compared with the display of an upper host so as to judge whether the functions of the host are normal or not. According to the tool, the CR200J motor train unit pressure sensor and the upper host can be rapidly tested, the fault point of the pressure sensor system can be rapidly and accurately judged, the maintenance efficiency is improved, and the tool equipment is easy to carry, simple to operate and reliable in test.

Description

Technical Field

[0001] This utility model relates to the field of railway transportation, and in particular to a calibration fixture for a pressure sensor of a CR200J high-speed train. Background Technology

[0002] The pressure sensor on the CR200J high-speed train is a device or tool that can sense pressure signals and convert them into usable output electrical signals according to a certain rule. In routine maintenance, due to the lack of dedicated testing equipment on site, the replacement method is usually used to determine the cause of the fault after the pressure sensor fails. This method is difficult to find the fault point and has low efficiency.

[0003] To solve this practical problem in maintenance work, it is necessary to develop a pressure sensor calibration fixture that can meet the daily needs of maintenance work. Summary of the Invention

[0004] The purpose of this invention is to provide a tooling for rapid testing of pressure sensors and host computers, enabling quick and accurate identification of fault points in the pressure sensor system, improving maintenance efficiency, and the tooling is easy to carry, simple to operate, and reliable in testing.

[0005] The technical solution proposed in this utility model is implemented as follows: A pressure sensor calibration fixture for a CR200J high-speed train consists of a housing, a circuit module installed inside the housing, and a connection interface. The circuit module installed inside the housing includes a microcontroller system board, an LCD display screen, an I / V conversion and buffer circuit, a V / I conversion and buffer circuit, and a power supply module. Two I / O ports of the microcontroller system board are respectively connected to the signal output terminal and the signal input terminal of the I / V conversion and buffer circuit. The microcontroller system board also has two I / O ports connected to the 3.3V output terminal of the microcontroller itself via a pressure adjustment button. The parallel LCD interface of the microcontroller system board is connected to the LCD display screen. The working power input port of the microcontroller system board is connected to its DC5V power supply port through the button switch of the power supply module. The connection interface includes a pressure sensor interface and a host interface, each of which includes a three-pin socket. The signal input "IN" port of the I / V conversion and buffer circuit is connected to pin 2 of the three-pin socket of the pressure sensor interface, and the signal output "OUT" port is connected to the I / O port of the microcontroller system board. The signal output "OUT+" and "OUT-" ports of the V / I conversion and buffer circuit are connected to pins 1 and 2 of the three-pin socket of the host interface, and the signal input "IN" port is connected to the I / O port of the microcontroller system board. The operating power supply "V+" and "V-" of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit are connected to the ±15V "+Vo" and "-Vo" output ports of the power module. The I / V conversion and buffer circuit and the V / I conversion and buffer circuit are composed of a dual operational amplifier circuit. The operational amplifier chip used is LM358. The microcontroller system board includes a microcontroller chip GD32F427ZGT6. Pins 1 and 2 of one LM358 are connected to PA5 of GD32F427ZGT6, and pin 5 is connected to PA4 of the microcontroller chip. Pins 6 and 7 are connected to pins 6, 7 and 3 of another LM358 through a linear optocoupler. Pins 8 and 4 of the other LM358 are connected to pins 1 and 2 of the host interface three-pin socket, respectively. The PA0 and PE4 pins of the microcontroller chip GD32F427ZGT6 are connected to the 3.3V output terminal of the microcontroller itself through the wind pressure adjustment button.The power module consists of a lithium battery and charging module, a ±15V power module, and a DC24V power module. The positive terminal of the lithium battery is connected to the "B+" terminal of the charging module, and the negative terminal is connected to the "B-" terminal of the charging module. The "5V" terminal of the charging module is connected to the normally open contact of the self-locking push-button switch and the "+5V" terminal of the charging interface. The "0V" terminal of the charging module is connected to the "0V" terminal of the charging interface, the GND terminal of the ±15V power module, the GND terminal of the 24V power module, and the GND terminal of the microcontroller system board. The other pin of the normally open contact of the self-locking switch is connected to the VIN terminal of the ±15V power module, the VIN terminal of the 24V power module, and the 5V terminal of the microcontroller system board. The ±15V power module is connected to the working power port of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit. The output terminal of the DC24V power module is connected to pin 1 of the three-pin socket of the pressure sensor interface. The connection interface includes an interface for connecting the pressure sensor under test, a host interface for connecting the vehicle's main unit connector, and two connecting cables with plugs. The pressure sensor interface and the main unit interface each use a three-pin socket mounted on the housing. The pressure sensor connector uses an AMPHENDL 2IN-16F-10-6S aviation plug; pin A of the plug connects to pin 1 of the three-pin socket on the sensor interface, and pin B connects to pin 2 of the three-pin socket on the pressure sensor interface. The housing is 3D printed from PLA material and has external openings for an LCD screen, interface mounting holes, switch button mounting holes, air pressure adjustment button holes, and a charging port. Internally, it contains a lithium battery mounting slot and a universal board mounting slot.

[0006] The pressure sensor calibration fixture for the CR200J EMU provided by this utility model can quickly test the pressure sensor and host computer of the CR200J EMU, and can quickly and accurately determine the fault point of the pressure sensor system, improving maintenance efficiency. Furthermore, the fixture is easy to carry, simple to operate, and reliable in testing. It enables early detection and handling of problems, reduces maintenance time, and improves maintenance efficiency. Attached Figure Description

[0007] Figure 1 Overall structural composition diagram;

[0008] Figure 2 Circuit schematic diagram;

[0009] Figure 3 LM358 operational amplifier circuit diagram;

[0010] Figure 4 :case;

[0011] Figure 5 : A rendering showing the effect during actual use;

[0012] In the diagram: PA4, PA5, PA0, PE4: I / O ports of the microcontroller system board; IN: Signal input port of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit; OUT: Signal output port; GND: Chip ground terminal; R: Resistor. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1 , 2 The following sections 3, 4, 5, and embodiments further illustrate the technical solutions and advantages of this utility model.

[0014] The pressure sensor calibration fixture for the CR200J high-speed train consists of the following components: Figure 1 As shown, the fixture mainly consists of a lithium battery and charging module, a ±15V power supply module, a DC24V power supply module, a GD32F427ZGT6 core board, a 3.5-inch LCD display, an I / V conversion and buffer circuit composed of an LM358 dual-channel operational amplifier circuit, a V / I conversion and buffer circuit, connecting connectors, and a housing. This fixture can receive pressure sensor signals from the CR200J EMU train via a sensor interface. The conversion circuit displays the pipeline air pressure in real time on the LCD screen. The actual air pressure on the train is compared with the displayed value to determine if the CR200J EMU train pressure sensor is functioning correctly. Alternatively, it can simulate the CR200J EMU train pressure sensor signal output via the host interface. Different air pressure values ​​are simulated using the air pressure adjustment button and compared with the host display to determine if the host function is normal.

[0015] Circuit principle as follows Figure 2 As shown, the lithium battery and charging module provide power to the microcontroller and conversion circuit within the test fixture, and also convert the power supply to provide operating power to the pressure sensor being tested. The microcontroller system board converts the analog signal from the sensor into a digital signal, and can be adjusted via buttons to provide a pressure signal of 0-600 kPa to the host interface, while simultaneously displaying the information on the LCD screen.

[0016] The microcontroller system board uses GigaDevice's GD32F427ZGT6 microcontroller, on which the main program, ADC program, DAC program, and LCD Chinese character display program were designed.

[0017] The microcontroller's 5V power supply pin is connected to the normally open contact of the self-locking switch. The GND pin is connected to the 0V of the charging module and grounded. The PA5 pin is connected to the output of the I / V conversion and buffer circuit. The PA4 pin is connected to the input of the V / I conversion and buffer circuit. The PA0 and PE4 pins are connected to the self-resetting wind pressure adjustment button, which is connected to the microcontroller's own 3.3V output pin. The LCD1 interface is connected to the CON1 interface of the LCD display via a 32-pin flat cable.

[0018] The LCD display is a WKS35HV017-WCT display, which is connected to the LCD1 port of the GD32F427 core board via a 32-pin flat cable.

[0019] The microcontroller program can achieve the following:

[0020] (1) Receive the 4-20mA current signal output by the pressure sensor of the CR200J EMU, convert it into a voltage signal through the I / V conversion circuit, send it to the single-chip A / D port, process it through the single-chip microcomputer software, and display the pressure value on the LCD screen.

[0021] (2) Under software control, a 4-20mA current signal can be sent to the upper level (host) of the sensor through the wind pressure adjustment button connected to the microcontroller to test the sensor output signal.

[0022] (3) Provide a human-machine interface for operators to control this tooling.

[0023] like Figure 3 The fixture shown uses two LM358 operational amplifiers to form an I / V conversion and buffer circuit, and a V / I conversion and buffer circuit.

[0024] The "V+" and "V-" pins of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit are connected to the "+Vo" and "-Vo" output ports of the ±15V power supply module. The "IN" port of the I / V conversion and buffer circuit is connected to pin 2 of the sensor interface three-pin socket, and the "OUT" port is connected to pin PA5 of the microcontroller system. The "IN" port of the V / I conversion and buffer circuit is connected to pin PA4 of the microcontroller system, and the "OUT+" and "OUT-" pins are connected to pins 1 and 2 of the host interface three-pin socket.

[0025] LM358 dual operational amplifier circuit as follows Figure 3 As shown, after the pressure sensor is connected to the fixture, the air pressure signal (current signal) from the pressure sensor undergoes I / V conversion by the operational amplifier circuit. Then, a buffer composed of LM358 circuitry converts the air pressure signal into a voltage signal, which is sent to pin PA5 of the microcontroller. The microcontroller software processes the signal and displays the pressure value of the pressure sensor on the LCD screen. Simultaneously, the 0-3.3V voltage signal output from pin PA4 can be adjusted using the fixture's self-resetting air pressure adjustment button. After passing through the buffer composed of LM358 circuitry and isolation by the linear optocoupler 817, the signal undergoes V / I conversion by the operational amplifier circuitry, outputting a 4-20mA current signal to the host interface.

[0026] The power module consists of a lithium battery and charging module, a ±15V power module and a DC24V power module. The power supply for this tooling consists of a DC3.7V lithium battery and a charging management module. When the charger charges the charging management module, the module charges the battery. After the charger is unplugged, the battery outputs DC5V power to the tooling through the charging management module to power the tooling.

[0027] The ±15V power supply module and the DC5V voltage of the charging management module are converted to ±15V voltage output to power the I / V conversion and buffer circuit and V / I conversion and buffer circuit composed of the LM358 operational amplifier chip in this tooling.

[0028] The DC24V power module converts the DC5V voltage of the charging management module into a DC24V output voltage, which is used to provide power to the pressure sensor under test at the output terminal.

[0029] The pressure sensor interface is used to connect the pressure sensor under test and transmit the wind pressure current signal output by the pressure sensor to this test fixture. The host interface is used to connect to the vehicle host connector and output the wind pressure signal simulated by this device to the vehicle host.

[0030] Assembly of the fixture: The LCD display is fixed to the upper shell with two screws. The three-pin socket is fixed to the upper side of the fixture with nuts, the self-locking push-button switch is fixed to the right side of the fixture with nuts, and the charging port is fixed to the lower side of the fixture with clips. The charging module, ±15V power module, DC24V power module, and LM358 dual operational amplifier circuit are soldered onto a multi-board and fixed inside the fixture. The multi-board also has soldered connectors for the lithium battery, the self-locking push-button switch, and the microcontroller system board; the microcontroller system board is fixed to the multi-board with pins.

[0031] Use of tooling:

[0032] 1) Press the power button to turn on the device;

[0033] 2) For example Figure 5 Connect the host interface to the sensor interface as shown, adjust the air pressure value using the air pressure adjustment button, check the analog pressure output value and the sensor pressure output value, and complete the tooling self-test.

[0034] 3) Connect the tooling sensor interface to the CR200J EMU pressure sensor. The sensor pressure output value on the LCD screen displays the real-time air pressure of the duct.

[0035] 4) Connect the host interface to the vehicle host connector. The air pressure adjustment button simulates different air pressure values, and the host displays the simulated air pressure value output by the tool.

Claims

1. A pressure sensor calibration fixture for a CR200J high-speed train, comprising a housing, a circuit module installed inside the housing, and a connection interface, characterized in that: The circuit modules installed inside the housing include a microcontroller system board, an LCD display, an I / V conversion and buffer circuit, a V / I conversion and buffer circuit, and a power module. The two I / O ports of the microcontroller system board are connected to the signal output and signal input terminals of the I / V conversion and buffer circuit, respectively. The microcontroller system board also has two I / O ports connected to the microcontroller's own 3.3V output terminal via a pressure adjustment button. The parallel LCD interface of the microcontroller system board is connected to the LCD display screen. The working power input port of the microcontroller system board is connected to its DC5V power supply port through the button switch of the power module. The connection interfaces include a pressure sensor interface and a host interface, each of which includes a three-pin socket.

2. The pressure sensor calibration fixture for the CR200J EMU as described in claim 1, characterized in that: The signal input "IN" port of the I / V conversion and buffer circuit is connected to pin 2 of the three-pin socket of the pressure sensor interface, and the signal output "OUT" port is connected to the I / O port of the microcontroller system board. The signal output "OUT+" and "OUT-" ports of the V / I conversion and buffer circuit are connected to pins 1 and 2 of the three-pin socket of the host interface, and the signal input "IN" port is connected to the I / O port of the microcontroller system board. The operating power supply "V+" and "V-" of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit are connected to the ±15V "+Vo" and "-Vo" output ports of the power module.

3. The CR200J EMU pressure sensor calibration fixture according to claim 1 or 2, characterized in that: The I / V conversion and buffer circuit and the V / I conversion and buffer circuit are composed of a dual operational amplifier circuit. The operational amplifier chip used is LM358. The microcontroller system board includes a microcontroller chip GD32F427ZGT6. Pins 1 and 2 of one LM358 are connected to PA5 of GD32F427ZGT6, and pin 5 is connected to PA4 of the microcontroller chip. Pins 6 and 7 are connected to pins 6, 7 and 3 of another LM358 through a linear optocoupler. Pins 8 and 4 of the other LM358 are connected to pins 1 and 2 of the host interface three-pin socket, respectively. The PA0 and PE4 pins of the microcontroller chip GD32F427ZGT6 are connected to the 3.3V output terminal of the microcontroller itself through the wind pressure adjustment button.

4. The pressure sensor calibration fixture for the CR200J EMU as described in claim 1, characterized in that: The power module consists of a lithium battery and charging module, a ±15V power module, and a DC24V power module. The positive terminal of the lithium battery is connected to the "B+" terminal of the charging module, and the negative terminal is connected to the "B-" terminal of the charging module. The "5V" terminal of the charging module is connected to the normally open contact of the self-locking push-button switch and the "+5V" terminal of the charging interface. The "0V" terminal of the charging module is connected to the "0V" terminal of the charging interface, the GND terminal of the ±15V power module, the GND terminal of the 24V power module, and the GND terminal of the microcontroller system board. The other pin of the normally open contact of the self-locking switch is connected to the VIN terminal of the ±15V power module, the VIN terminal of the 24V power module, and the 5V terminal of the microcontroller system board. The ±15V power module is connected to the working power port of the I / V conversion and buffer circuit and the V / I conversion and buffer circuit. The output terminal of the DC24V power module is connected to pin 1 of the three-pin socket of the pressure sensor interface.

5. The pressure sensor calibration fixture for the CR200J EMU as described in claim 1, characterized in that: The connection interface includes an interface for connecting the pressure sensor to be tested, a host interface for connecting the vehicle host connector, and two connecting wires with plugs. The pressure sensor interface and the host interface each use a three-pin socket mounted on the housing. The pressure sensor connector uses an AMPHENDL 62IN-16F-10-6S aviation plug. Pin A of the plug connects to pin 1 of the three-pin socket of the sensor interface, and pin B connects to pin 2 of the three-pin socket of the pressure sensor interface.

6. The pressure sensor calibration fixture for the CR200J EMU as described in claim 1, characterized in that: The casing is made using 3D printing and is made of PLA. On the outside, there are openings for the LCD screen, interface mounting holes, switch button mounting holes, air pressure adjustment button holes, and a charging port. On the inside, there are lithium battery mounting slots and universal board mounting slots.

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