WO2018023897A1

WO2018023897A1 - Ground detection device for locomotive control loop, and control method thereof

Info

Publication number: WO2018023897A1
Application number: PCT/CN2016/106727
Authority: WO
Inventors: 陈诚; 束昊昱; 曹海华; 黄敬云; 罗柳文
Original assignee: 中车戚墅堰机车有限公司
Priority date: 2016-08-04
Filing date: 2016-11-22
Publication date: 2018-02-08
Also published as: CN106291318A; CN106291318B

Abstract

The present invention relates to the field of internal combustion locomotives, and discloses a ground detection device for a locomotive control loop, and control method thereof. The device comprises a microcontroller unit (MCU), a power supply module, an attenuator circuit, an LED indicator, a protocol converter, and an isolated output. The ground detection device for a locomotive control loop of the present invention has a simple structure, and is applicable to ground detection and balance detection for the voltage of all control loops within the range of 45-120 V.

Description

Locomotive control loop grounding detecting device and control method thereof

[0001] The present invention relates to a grounding detecting device, and more particularly to a locomotive control loop grounding detecting device and a control method thereof.

Background technique

[0002] The commonly used locomotive control loop voltages are 74V and 110V. The short circuit of the control loop voltage to the ground may directly affect the driving safety. Whether the positive and negative voltages of the control loop are balanced to the ground, and the EMC environment impact on the electronic equipment of the locomotive. It is also large, so the new model is equipped with a grounding detection device for the control circuit for corresponding protection.

[0003] The principle of the grounding detection device currently used is to drive the relay or the diaphragm to isolate the output fault signal by using the differential pressure change of the grounding point, and the voltage comparison is realized by a comparison circuit built by a Zener diode or an operational amplifier, but such a circuit The voltage requirements of the power supply are relatively high, and different control voltages require different matching circuits for detection, poor versatility, low precision, and unquantified output information.

technical problem

The present invention is directed to solving the above drawbacks, and provides a locomotive control loop grounding detecting device.

Problem solution

Technical solution

[0005] The technical solution adopted by the present invention to solve the technical problem thereof is: The locomotive control loop grounding detecting device comprises an MCU single chip microcomputer, a power supply module, an attenuation circuit, an LED indicator, a protocol converter and an isolated output;

[0006] The input end of the power module is connected to an input signal, and the input signal includes a control power source, a control power source, and a ground;

[0007] The control power source is connected in parallel to the balance resistor R1, and the control power supply is connected in parallel with the balance resistor R2, and the resistance of the balance resistor R 1 and the balance resistor R2 is set to 10K;

[0008] The power module converts the high voltage control power into a 5V low voltage power supply, and is connected to the MCU microcontroller; [0009] the MCU is connected to two attenuators connected to the MCU microcontroller; [0010] The MCU is also connected with a button, an LED indicator, an isolated output, and a protocol converter, and the protocol converter is connected to the RS485 device;

[0011] The LED indicator shows the voltage balance state. There are 8 LED indicators, arranged from the middle to the two sides, respectively, the green lights with numbers 4 and 5, the yellow lights with numbers 3 and 6, the number is 2. The orange light of 7 and the red light of the number 1 and 8, the LED indicator is directly driven by the 10 ports of the MCU microcontroller, and the LED indicator adopts the common male connection method.

[0012] According to another embodiment of the present invention, the voltage attenuating circuit is further comprised of an operational amplifier and a resistor having an attenuation ratio of 1:50.

[0013] According to another embodiment of the present invention, the method further comprises: first, using a tool to confirm that the locomotive control power supply voltage is normal, and pressing the button to power the ground detecting device, when two LED points on both sides of the LED indicator If it is bright, the button can be released. The control power supply voltage of the current locomotive has been sampled by the MCU and registered in the EEROM.

[0014] After normal use, the MCU microcontroller collects U0 and U1 voltage data at a sampling frequency of 100 Hz, and obtains a real voltage value through conversion, and obtains a voltage value through an average value filtering algorithm, and the actual operating frequency is 10 Hz.

[0015] When the sampled U0 is different from the first recorded U0 by more than 15%, the voltage is reported to be low;

[0016] When the sampled U0 differs from the initially recorded U0 by more than 35%, the reported voltage is severely low;

[0017] When U1/U0 is within 50±5<3⁄4, the LED is not lit and there is no fault output;

[0018] When SSy^Ul/lKKAS^吋, the number 4 on the LED indicator lights up, and the negative end is unbalanced level 1 fault; [0019] When Sy^Ul/lKKSS^吋, the LED indicator number is 3, 4 lit, report negative end unbalanced level 2 fault; [0020] When lSy^Ul/LKk S^吋, the LEDs on the LEDs 2, 3, 4 are lit, and the negative end is unbalanced with 3 levels of faults;

[0021] When Ul/U0<15<3⁄4吋, the numbers 1, 2, 3, and 4 on the LED indicator light up, and the negative end is unbalanced and the fault is faulty.

[0022] When SS^ Ul/lK eS^吋, the number 5 on the LED indicator lights up, and the positive end is unbalanced level 1 fault; [0023] When eSy^Ul/LK S^吋, the LED indicator number is 5 6 is lit, and the positive end is unbalanced with level 2 fault; [0024] When Sy^Ul/lK SS^吋, the numbers 5, 6, and 7 on the LED indicator light up, and the positive end unbalanced level 3 fault is reported; [0025] When Ul/U0>85<3⁄4吋, the numbers 5, 6, 7, and 8 on the LED indicator light up, and the positive end unbalanced level 4 fault and the positive end ground fault are reported;

[0026] In the case of a severely low voltage fault, a negative-end unbalanced 4-level fault, and a positive-end unbalanced 4-level fault, the drive 10 outputs a fault signal.

Advantageous effects of the invention

Beneficial effect

[0027] The beneficial effects of the present invention are: The locomotive control loop grounding detecting device has a simple structure, and can be applied to all control loop voltage grounding and balance detection between 45 and 120V.

Brief description of the drawing

DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

1 is a schematic view showing the structure of the present invention.

1 is a schematic structural view of the present invention, which includes an MCU microcontroller, a power module, an attenuation circuit, an LED indicator, a protocol converter, and an isolated output; an input terminal of the power module is connected to an input signal, and the input signal includes a control power supply. Positive, control power supply negative, grounding; control power supply is connected to the ground in parallel with the balance resistor Rl, control power supply is connected to the ground in parallel with the balance resistor R2, the balance resistor R1 and the balance resistor R2 resistance is set to 10K; The power module converts the high-voltage control power into a 5V low-voltage power supply and connects the M CU microcontroller; the MCU is connected to two attenuators to connect the MCU microcontroller; the MCU is also connected with a button, an LED indicator, an isolated output, and a protocol converter. The protocol converter is connected to the RS485 device; the LED indicator shows the voltage balance status. There are 8 LED indicators, arranged from the middle to the two sides, respectively, the green lights with numbers 4 and 5, and the yellow lights with numbers 3 and 6. The number is 2, 7 orange, the number is 1, 8 red, the LED indicator is MCU Direct drive 10, LED indicator using common anode connection.

[0031] The overall structure uses the MCU single-chip as the main processor, and the voltage signal of different measuring points is sampled by the 10-bit AD channel provided by the MCU single-chip microcomputer. After comprehensive judgment, the LED indicator is displayed to display the voltage balance state, and the output is not isolated by the diaphragm. Balance or ground signal to other equipment, or through RS485 communication, send voltage and fault information to other RS485 equipment, communication using MODBUS-RTU protocol;

[0032] The device can be applied to all control loop voltage grounding and balance detection between 45 and 120V; [0033] The input signal includes a control power supply positive, a control power supply negative, and a ground (locomotive casing);

[0034] The control power source is integrated into the balance resistor R1 between the ground, and the control power source is integrated into the balance resistor between the ground and the ground.

The resistance values of R1 and R2 are preset to 10K, and the specific values are matched according to the actual conditions of each type of locomotive;

[0035] The high-voltage control power is converted into a 5 V low-voltage power supply through an isolated power module, and the subsequent circuit is powered, and the power module input range is 45~120V;

[0036] The sampling voltage is less than or equal to 120V, and the AD input voltage range of the MCU microcontroller is 0~2.56V, so the voltage attenuation circuit needs to be added in the middle of the voltage sampling, and the attenuation circuit is composed of an operational amplifier and a resistor, and the attenuation ratio is 1:50;

[0037] The MCU MCU is used as the main controller, and the voltage signals U0 and U1 are attenuated by the two 10-bit AD samples. U0 is the voltage of the control power supply, and U1 is the negative voltage of the ground control power supply, then the control power supply is directly opposite to the ground. The voltage U2 = U0-U1, if the MCU microcontroller comes with a reference voltage of 2.56V, Bay UUO =

50x(2.56xAD0/1024) = ADO/8, Ul = 50x (2.56xAD 1/1024) = AD 1/8;

[0038] The function of the button is to initialize the power supply voltage parameter. When the control power supply loop is normal, press the button and then power on.

The MCU MCU will record the control power supply voltage U0 of this 做 as the voltage reference parameter;

[0039] The LED indicator shows the voltage balance state. There are 8 LED indicators, arranged from the middle to the two sides, respectively, the green light of the numbers 4 and 5, the yellow light of the numbers 3 and 6, the numbers 2, 7 The orange light displayed, the red light displayed by the numbers 1, 8 are used to represent different balance states, which change from green to red, indicating the severity. The LED indicator is directly driven by the MCU's 10 ports, and the LED indicator is commonly used. Law

[0040] The device can also output a fault signal with unbalanced voltage or grounding. In order to increase the load capacity, the output is driven by the optocoupler and the MOS tube.

[0041] The device can also output specific voltage data and fault judgment information as well as other custom functions, through the RS

485 interface, using MODBUS-RTU protocol transmission, MCU microcontroller itself comes with RS232 serial interface, in order to match the RS485 interface used by most devices, by adding RS232 to RS485 protocol conversion chip implementation.

[0042] The control method of the locomotive control loop grounding detection device is:

[0043] Firstly, the tool is used to confirm that the power supply voltage of the locomotive is normal. When the button is pressed, the grounding detection device is energized. When the two LEDs on both sides of the LED indicator are lit, the button can be released, and the control power supply voltage of the current locomotive has been The MCU microcontroller samples and registers the data into the EEROM; [0044] After normal use, the MCU MCU collects U0 and Ul voltage data at a sampling frequency of 100 Hz, and obtains a real voltage value through conversion, and obtains a voltage value through an average value filtering algorithm, and the actual working frequency is 10 Hz.

[0045] When the sampled U0 is more than 15% different from the first recorded U0, the voltage is reported to be low;

[0046] When the sampled U0 differs from the first recorded U0 by more than 35%, the reported voltage is severely low;

[0047] When U1/U0 is within 50±5<3⁄4, the LED is not lit and there is no fault output;

[0048] When SSy^Ul/lKKAS^吋, the number 4 on the LED indicator lights up, and the negative end is unbalanced level 1 fault; [0049] When Sy^Ul/lKKSS^吋, the LED indicator number is 3. 4 lit, report negative end unbalanced level 2 fault; [0050] When lSy^Ul/LKk S^吋, the LEDs on the LEDs 2, 3, 4 are lit, and the negative end is unbalanced level 3 fault;

[0051] When Ul/U0<15<3⁄4吋, the numbers 1, 2, 3, and 4 on the LED indicator light up, and the negative end is unbalanced and the fault is faulty.

[0052] When SS^ Ul/lK eS^吋, the number 5 on the LED indicator lights up, and the positive end is unbalanced with a level 1 fault; [0053] When esy^Ul/LK S^吋, the LED indicator number is 5 6 is lit, and the positive end is unbalanced with level 2 fault; [0054] When Sy^Ul/lK SS^吋, the numbers 5, 6, and 7 on the LED indicator light up, and the positive end is unbalanced for 3 levels;

[0055] When Ul/U0>85<3⁄4吋, the numbers 5, 6, 7, and 8 on the LED indicator light up, and the positive end unbalanced level 4 fault and the positive end ground fault are reported;

[0056] In the case of a severely low voltage fault, a negative-end unbalanced 4-level fault, and a positive-end unbalanced 4-level fault, the drive 10 outputs a fault signal.

Claims

Claim

[Claim 1] A locomotive control loop grounding detecting device, comprising: an MCU single chip microcomputer, a power supply module, an attenuation circuit, an LED indicator, a protocol converter, and an isolated output; wherein an input end of the power module is connected to an input signal The input signal includes the control power supply positive, the control power supply negative, the grounding, the voltage between the control power supply and the control power supply negative is U0, the control power supply negative and ground voltage is Ul, and the control power supply positive and ground voltage is U2;

The control power source is connected in parallel to the balance resistor R1, and the control power source is connected in parallel to the ground to connect the balance resistor R2, and the resistance of the balance resistor R1 and the balance resistor R2 is set to 10K. The power module will be high voltage. The control power is converted to a 5 V low voltage power supply and connected to the MC U microcontroller;

Connecting two attenuators to the MCU microcontroller on the MCU;

The MCU is further connected with a button, an LED indicator, an isolated output, and a protocol converter, and the protocol converter is connected to the RS485 device;

The LED indicator shows the voltage balance state. There are 8 LED indicators, arranged from the middle to the two sides, respectively, the green lights with numbers 4 and 5, the yellow lights with numbers 3 and 6, the numbers are 2, 7 The orange light, the number is 1, 8 red light, the LED indicator is directly driven by the 10 ports of the MCU microcontroller, and the LED indicator adopts the common male connection method.

[Claim 2] The locomotive control loop grounding detecting device according to claim 1, wherein the voltage attenuating circuit is composed of an operational amplifier and a resistor, and has an attenuation ratio of 1:50.

[Claim 3] The control method of the locomotive control loop grounding detecting device according to claim 1, wherein the method comprises: first confirming that the locomotive control power supply voltage is normal by using a tool, and energizing the ground detecting device after pressing a button When the two LEDs on both sides of the LED indicator are lit, the button can be released. The control power supply voltage of the current locomotive has been sampled by the MCU and registered in the EEROM.

After normal use, the MCU microcontroller collects the U0 and U1 voltage data at a sampling frequency of 100 Hz, and obtains the real voltage value after conversion, and obtains the voltage value through the average value filtering algorithm, and the actual working frequency is 10 Hz; When the sampled U0 is more than 15% different from the first recorded U0, the voltage is reported to be low; when the sampled U0 is more than 35% different from the first recorded U0, the voltage is reported to be severely low;

When U1/U0 is within 50±5%, the LED is not lit and there is no fault output;

When SS^ Ul/lKKAS^吋, the number 4 on the LED indicator lights up, and the negative end is unbalanced.

When SS^ Ul/lKKSS^吋, the numbers 3 and 4 on the LED indicator light up, and the negative end is unbalanced and level 2 fault;

When lS^ Ul/LKk S^吋, the LEDs on the LEDs 2, 3, 4 are lit, and the negative end is not balanced with a level 3 fault;

When Ul/U0<15<3⁄4吋, the numbers 1, 2, 3, and 4 on the LED indicator light up, and the negative end is unbalanced. 4 faults and negative ground faults;

When SSy^Ul/lK eS^吋, the number 5 on the LED indicator lights up, and the positive end is unbalanced.

When SSy^Ul/lK S^吋, the numbers 5 and 6 on the LED indicator light up, and the positive terminal is unbalanced and level 2 fault;

When Sy^Ul/lK SS^吋, the numbers 5, 6, and 7 on the LED indicator light up, and the positive end is not balanced with a level 3 fault;

When Ul/U0>85<3⁄4吋, the numbers 5, 6, 7, and 8 on the LED indicator light up, and the positive end is unbalanced. The 4th fault and the positive ground fault;

In the case of a severely low voltage fault, a negative-end unbalanced 4-level fault, and a positive-end unbalanced 4-level fault, the drive 10 outputs a fault signal.