A long-life intelligent carbon monoxide sensor

Abstract

The present invention relates to a long-life intelligent carbon monoxide sensor, which belongs to the field of coal mine environmental gas detection sensors. The sensor mainly includes a microprocessor, a carbon monoxide gas detection module, a position positioning module, a self-diagnosis module, a communication interaction module, etc. The carbon monoxide gas concentration in the environment is detected by the carbon monoxide gas detection module, and the gas concentration value is transmitted to the microprocessor for processing, and then uploaded to the ground monitoring platform via the communication interaction module. The position positioning module and the self-diagnosis module are used to realize the real-time update measurement of the three-dimensional position coordinates of the sensor, as well as the detection and diagnosis of the sensor fault characteristic information. The present invention adopts a carbon monoxide sensitive element based on solid polymer to detect the carbon monoxide gas concentration, which greatly improves the service life of the sensor. At the same time, the position positioning module and the self-diagnosis module are set to realize the position and posture detection of the sensor, as well as the diagnosis of key signals, thereby improving the intelligence level of the carbon monoxide sensor.

Description

Technical Field

[0001] The invention belongs to the field of coal mine environment gas detection sensors and relates to a long-life intelligent carbon monoxide sensor. Background Art

[0002] Carbon monoxide sensors, the primary instrument for monitoring carbon monoxide gas concentrations in coal mines, play a crucial role in early fire warning and are currently the most mature and widely used fire warning and monitoring method. With the advancement of intelligent mining, long-life, accurate detection has become a crucial requirement for intelligent sensors. After more than a decade of development, electrochemical carbon monoxide gas detection sensors based on liquid electrolytes offer high resolution and a low detection limit, becoming the primary technical principle behind carbon monoxide sensors in coal mines. However, electrochemical sensors based on liquid electrolytes are highly hygroscopic in the high humidity environments of underground coal mines, prone to leakage, significantly reducing their service life. In some environments, their service life can be as short as one year. The electrolyte overflow after absorbing water corrodes the circuitry, causing unstable sensor operation. Electrochemical carbon monoxide gas sensors based on liquid electrolytes detect ambient gas concentrations, but their service life is significantly shortened in high humidity environments, typically only one to two years in underground coal mines. Current carbon monoxide sensors used in mines lack positioning and self-diagnostic capabilities, leading to unauthorized movement and non-compliance with coal mine sensor layout standards, seriously impacting safety supervision and accident investigation and analysis. In addition, when there is exhaust from rubber-wheeled vehicles or hydrogen sulfide gas in the environment, the sensor will give a false alarm, seriously affecting the effectiveness of monitoring and causing confusion and trouble for the mine owners and regulatory authorities, and affecting coal mine safety production. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a long-life intelligent carbon monoxide sensor to increase the service life of the sensor, realize sensor position positioning and self-diagnosis functions, and avoid cross interference of nitrogen oxides and hydrogen sulfide gases.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A long-life intelligent carbon monoxide sensor, comprising a carbon monoxide gas detection module, a microprocessor, a communication interaction module, a position positioning module and a self-diagnosis module;

[0006] The carbon monoxide gas detection module is used to detect the carbon monoxide gas concentration and transmit the detected data in real time to the microprocessor, which is used to identify the status of the remaining modules and control the operation of the remaining modules; the communication interaction module is used to communicate with the upper-level equipment or the ground monitoring platform; the position positioning module detects the position of the sensor in real time through a real-time update measurement method of the sensor's three-dimensional position coordinates, and uploads the position information to the ground monitoring platform through the communication interaction module; the self-diagnosis module is used to detect and diagnose the sensor fault characteristic information in real time to determine whether the sensor is in a fault state;

[0007] The position positioning module, the communication interaction module, the power supply module and the microprocessor are connected in sequence, the self-diagnosis module is connected to the power supply module, and the carbon monoxide gas detection module is connected to the microprocessor.

[0008] Optionally, the position positioning module includes a positioning module that interacts with the outside world, or an autonomous positioning module that does not interact with the outside world, or includes both positioning modules at the same time; when the position changes, the position positioning module sends the position information to the microprocessor, the microprocessor stores the position information and the corresponding time, and uploads it through the communication interaction module.

[0009] Optionally, the real-time update measurement method of the sensor's three-dimensional position coordinates is as follows:

[0010] S1. Read the position information stored by the sensor and store it in variable W pre , the effective change of the preset position is L;

[0011] S2. Read the position information of the positioning module, store it in variable W, and record the change time T;

[0012] S3. Calculate the instantaneous position change Δ = WW pre ;

[0013] S4, compare whether Δ is greater than L, if so, proceed to step S5, if not, return to step S2;

[0014] S5. Assign the value of W to W pre , update the sensor position information and change time, and transmit the position information and change time to the microprocessor, and return to step S2.

[0015] Optionally, the sensor fault characteristic information includes the input voltage and input current of the carbon monoxide sensor, and the power supply voltage and output signal voltage amplitude of the carbon monoxide gas detection module;

[0016] The self-diagnosis module detects sensor fault characteristic information in the following ways:

[0017] 1) The input voltage is detected by a voltage divider detection circuit consisting of no less than two resistors with a total resistance of no less than 100KΩ. If the A / D signal input voltage of the input voltage is greater than U1 or less than U2, the input voltage of the carbon monoxide sensor is abnormal;

[0018] 2) The input current is sampled by connecting a current sampling resistor with a resistance of 1Ω in series with the positive electrode of the input voltage, and a differential amplifier circuit is used to convert the sampled current into an A / D signal input voltage. If the A / D signal input voltage of the input current is greater than U3 or less than U4, the input current of the carbon monoxide sensor is abnormal;

[0019] 3) The power supply voltage is detected by a voltage divider detection circuit consisting of no less than two resistors with a total resistance of no less than 10KΩ. If the A / D signal input voltage of the power supply voltage is greater than U5 or less than U6, the power supply voltage of the carbon monoxide gas detection module is abnormal;

[0020] 4) The output signal voltage amplitude should be within the range of 1.0 to 2.25 VDC.

[0021] Optionally, the sizes of U1 and U2 are determined by the maximum and minimum values ​​of the normal operating input voltage of the carbon monoxide sensor; the sizes of U3 and U4 are determined by the maximum and minimum values ​​of the operating current corresponding to the input voltage; the sizes of U5 and U6 are determined by the maximum and minimum values ​​of the normal power supply voltage of the carbon monoxide gas detection module.

[0022] Optionally, the carbon monoxide gas detection module includes a carbon monoxide sensitive element and a signal processing circuit;

[0023] The carbon monoxide sensitive element is used to detect the concentration of carbon monoxide gas and output a current signal. The signal processing circuit converts the current signal into a voltage signal and transmits the current signal to the microprocessor.

[0024] Optionally, the carbon monoxide gas detection module further includes a temperature measuring element and an air pressure measuring element for measuring the temperature and air pressure of the environment in which the carbon monoxide sensitive element is located in real time, and performing temperature and pressure compensation correction.

[0025] Optionally, the carbon monoxide sensitive element is provided with at least one layer of gas selective filter membrane, and the filter membrane is capable of absorbing nitrogen oxide gas and hydrogen sulfide gas.

[0026] Optionally, the communication interaction module is powered by an isolated power supply module, is insulated from other circuit parts of the sensor in a high-impedance state, and has no current loop.

[0027] Optionally, the sensor further comprises a data storage module, an alarm module, a display module and a remote control input module; the remote control input module is connected to the microprocessor via the data storage module, and the alarm module is connected to the microprocessor via the display module;

[0028] The data storage module is used to store the sensor's zero point, sensitivity, alarm point, communication address, and maximum concentration information in real time; the alarm module emits an audible and visual alarm signal when the carbon monoxide gas concentration is abnormal to remind the operator; the display module is used to display the carbon monoxide gas concentration or sensor parameter information in real time; the remote control input module is used to realize the reception of non-contact infrared signals.

[0029] The beneficial effects of the present invention are as follows: the present invention adopts a carbon monoxide sensitive element based on the solid-state polymer electrochemical detection principle, which greatly improves the service life of the sensor. At the same time, a gas selective filter membrane is added to the sensitive element to absorb and filter nitrogen oxides and hydrogen sulfide gases, thereby solving the cross-interference problem of nitrogen oxides and hydrogen sulfide gases, and realizing long-life intelligent and accurate detection of carbon monoxide gas concentration in coal mines, thereby ensuring safe production in coal mines; in addition, the present invention also adds a position positioning module and a self-diagnosis module to realize sensor position and posture detection, as well as diagnosis of key signals, thereby improving the intelligence level of the carbon monoxide sensor.

[0030] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the electrical structure of the carbon monoxide sensor. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] like Figure 1 The figure shows the structure of a carbon monoxide sensor, which includes a carbon monoxide gas detection module, a power module, a microprocessor, a communication and interaction module, a data storage module, a remote control input module, a display module, an alarm module, a location positioning module, and a self-diagnosis module. The carbon monoxide gas detection module is connected to the microprocessor, the alarm module is connected to the microprocessor via the display module, the remote control input module is connected to the microprocessor via the data storage module, and the microprocessor is connected to the power module; the self-diagnosis module is connected to the power module, and the location positioning module is connected to the communication and interaction module.

[0035] The carbon monoxide gas detection module includes a carbon monoxide sensor based on the solid-state polymer electrochemical detection principle, a temperature measuring element, a pressure measuring element, and a signal processing circuit. The sensor, temperature measuring element, and pressure measuring element are arranged on the same side of the circuit board, thereby accurately measuring the temperature and pressure within the gas chamber where the carbon monoxide sensor is located, and performing real-time temperature and pressure compensation corrections on the carbon monoxide gas concentration detected by the sensor. In this embodiment, the carbon monoxide sensor model can be selected from 01-ES4-CO-1000-01, 01-ES1-CO-1000-01, etc. The temperature compensation element can be an EWTF03-682F3I thermistor, and the pressure measuring element can be a small-package high-resolution pressure sensor with a range of 300mbar to 1200mbar. The carbon monoxide sensor is provided with at least one gas-selective filter membrane capable of filtering and absorbing nitrogen oxides and hydrogen sulfide gases to avoid cross-interference that affects the accuracy of carbon monoxide gas concentration detection. The signal processing circuit is mainly used to convert the current signal output by the sensor into a voltage signal.

[0036] The power module is used to implement DC-DC step-down of the associated intrinsically safe power supply voltage. According to the circuit design, it outputs a specific voltage between 3 and 6 V, such as 3.6 V, to power the microprocessor and various modules.

[0037] The microprocessor is used to carry the logic program of the sensor. After power-on, it identifies the status of other modules according to the logic program and controls the working logic of other modules. The microprocessor can be TM4C123GE6PZ, STM32F072, etc.

[0038] The communication interaction module is used to implement digital communication between the sensor and the upper-level device. It receives commands from the upper-level device and, based on the microprocessor's logic, transmits corresponding data according to the received command type, uploads it to the ground monitoring platform, and displays it. The communication interaction module can be one or more of an RS485 communication module, a CAN communication module, and an optoelectronic conversion module. In this embodiment, the RS485 module is preferred. The communication interaction module is powered by an isolated power supply module, and the signal is isolated by an optocoupler device. The isolated power supply module can be a B0305S, B0505S, etc., and the optocoupler device can be a PC357, etc.

[0039] The data storage module is used to store the sensor's zero point, sensitivity, alarm point, communication address, maximum concentration and other information in real time. The data storage module can be the EEPROM inside the microprocessor or an external independent storage chip AA24C02.

[0040] The remote control input module is used to receive non-contact infrared signals and output corresponding coded waveforms. The preferred module is YMG-338H.

[0041] The display module can display the concentration of carbon monoxide gas in real time and switch to display sensor parameter information according to the information of the remote control input module. The display module is preferably a digital tube or a dot matrix liquid crystal display screen.

[0042] The position positioning module is used to achieve real-time update measurement of the sensor's three-dimensional position coordinates and send them to the microprocessor for processing. This module can be a three-axis accelerometer, a Bluetooth positioning module, a personnel positioning card, etc. The real-time update measurement method of the sensor's three-dimensional position coordinates is as follows:

[0043] S1. Read the position information stored by the sensor and store it in variable W pre , the effective change of the preset position is L;

[0044] S2. Read the position information of the positioning module, store it in variable W, and record the change time T;

[0045] S3. Calculate the instantaneous position change Δ = WW pre ;

[0046] S4, compare whether Δ is greater than L, if so, proceed to step S5, if not, return to step S2;

[0047] S5. Assign the value of W to W pre , update the sensor position information and change time, and transmit the position information and change time to the microprocessor, and return to step S2.

[0048] The self-diagnosis module is used to detect and diagnose the sensor fault characteristic information. The detection and diagnosis results are used to determine whether the sensor is in a fault state. The fault characteristic information includes the sensor input voltage, input current, carbon monoxide gas detection module power supply voltage, output signal voltage amplitude, etc. The specific fault diagnosis method is as follows:

[0049] 1) Input Voltage: Detection is performed using a voltage divider detection circuit consisting of at least two resistors with a total resistance of no less than 100KΩ. If the A / D signal input voltage is greater than 2.00VDC or less than 0.72VDC, the CO sensor's input voltage is abnormal. The resistor values ​​in the voltage divider detection circuit should be selected so that the normal sensor input voltage (9-25VDC) is converted to an A / D signal input voltage of 0.72-2.00VDC.

[0050] 2) Input current: After a large number of prototype tests, if the sensor input voltage is 15VDC, the normal input current range is (23-28mA). The input current is sampled by connecting a current sampling resistor with a resistance of 1Ω in series with the positive electrode of the input voltage, and a differential amplifier circuit is used to convert the sampled current into an A / D signal input voltage. If the A / D signal input voltage of the input current is greater than 0.42VDC or less than 0.345VDC, the input current of the carbon monoxide sensor is abnormal.

[0051] 3) Power Supply Voltage: The power supply voltage should be within the range of 3.0-5.0 VDC. The present invention uses a linear voltage regulator chip with an output voltage of 3.3 VDC for power supply. The power supply voltage is detected by a voltage divider detection circuit consisting of two 10K resistors. The A / D signal input voltage of the power supply voltage is 1.65 VDC. If the A / D signal input voltage of the power supply voltage is greater than 1.80 VDC or less than 1.50 VDC, the power supply voltage of the carbon monoxide gas detection module is abnormal. In the voltage divider detection circuit, the resistor values ​​should be selected so that the normal power supply voltage (3-5 VDC) of the carbon monoxide gas detection module is converted to an A / D signal input voltage of 1.35-2.25 VDC.

[0052] 4) The normal output signal voltage amplitude of the carbon monoxide gas detection module should be within the range of 1.0 to 2.25 VDC. If the output signal voltage amplitude is less than 1 VDC or greater than 2.25 VDC at a certain time, it is judged that the output signal voltage amplitude is abnormal.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A long-life intelligent carbon monoxide sensor, characterized by: It includes a carbon monoxide gas detection module, a microprocessor, a communication interaction module, a position positioning module and a self-diagnosis module; The carbon monoxide gas detection module is used to detect the carbon monoxide gas concentration and transmit the detected data in real time to the microprocessor, which is used to identify the status of the remaining modules and control the operation of the remaining modules; the communication interaction module is used to communicate with the upper-level equipment or the ground monitoring platform; the position positioning module detects the position of the sensor in real time through a real-time update measurement method of the sensor's three-dimensional position coordinates, and uploads the position information to the ground monitoring platform through the communication interaction module; the self-diagnosis module is used to detect and diagnose the sensor fault characteristic information in real time to determine whether the sensor is in a fault state; The position positioning module, communication interaction module, power supply module and microprocessor are connected in sequence, the self-diagnosis module is connected to the power supply module, and the carbon monoxide gas detection module is connected to the microprocessor; The real-time update measurement method of the sensor's three-dimensional position coordinates is as follows: S1. Read the position information stored by the sensor and store it in variable W pre , the effective change of the preset position is L; S2. Read the position information of the positioning module, store it in variable W, and record the change time T; S3. Calculate the instantaneous position change Δ = WW pre ; S4, compare whether Δ is greater than L, if so, proceed to step S5, if not, return to step S2; S5. Assign the value of W to W pre , update the sensor position information and change time, and transmit the position information and change time to the microprocessor, and return to step S2; The sensor fault characteristic information includes the input voltage and input current of the carbon monoxide sensor, and the power supply voltage and output signal voltage amplitude of the carbon monoxide gas detection module; The self-diagnosis module detects sensor fault characteristic information in the following ways: 1) The input voltage is detected by a voltage divider detection circuit consisting of no less than two resistors with a total resistance of no less than 100KΩ. If the A / D signal input voltage of the input voltage is greater than U1 or less than U2, the input voltage of the carbon monoxide sensor is abnormal; 2) The input current is sampled by connecting a current sampling resistor with a resistance of 1Ω in series with the positive electrode of the input voltage, and a differential amplifier circuit is used to convert the sampled current into an A / D signal input voltage. If the A / D signal input voltage of the input current is greater than U3 or less than U4, the input current of the carbon monoxide sensor is abnormal; 3) The power supply voltage is detected by a voltage divider detection circuit consisting of no less than two resistors with a total resistance of no less than 10KΩ. If the A / D signal input voltage of the power supply voltage is greater than U5 or less than U6, the power supply voltage of the carbon monoxide gas detection module is abnormal; 4) The output signal voltage amplitude should be within the range of 1.0 to 2.25 VDC; The sizes of U1 and U2 are determined by the maximum and minimum values ​​of the normal operating input voltage of the carbon monoxide sensor; the sizes of U3 and U4 are determined by the maximum and minimum values ​​of the operating current corresponding to the input voltage; the sizes of U5 and U6 are determined by the maximum and minimum values ​​of the normal power supply voltage of the carbon monoxide gas detection module.

2. The long-life intelligent carbon monoxide sensor according to claim 1, characterized in that: The position positioning module includes a positioning module that interacts with the outside world, or an autonomous positioning module that does not interact with the outside world, or both positioning modules. When the sensor position changes, the position positioning module sends the position information to the microprocessor, and the microprocessor stores the position information and the corresponding time and uploads it through the communication interaction module.

3. The long-life intelligent carbon monoxide sensor according to claim 1, characterized in that: The carbon monoxide gas detection module includes a carbon monoxide sensitive element and a signal processing circuit; The carbon monoxide sensitive element is used to detect the concentration of carbon monoxide gas and output a current signal. The signal processing circuit converts the current signal into a voltage signal and transmits the current signal to the microprocessor.

4. The long-life intelligent carbon monoxide sensor according to claim 3, characterized in that: The carbon monoxide gas detection module further comprises a temperature measuring element and an air pressure measuring element, which are used to measure the temperature and air pressure of the environment in which the carbon monoxide sensitive element is located in real time and perform temperature and pressure compensation correction.

5. The long-life intelligent carbon monoxide sensor according to claim 3, characterized in that: The carbon monoxide sensitive element is provided with at least one layer of gas selective filter membrane, and the filter membrane can absorb nitrogen oxide gas and hydrogen sulfide gas.

6. The long-life intelligent carbon monoxide sensor according to claim 1, characterized in that: The communication interaction module is powered by an isolated power supply module and is insulated from other circuit parts of the sensor in a high-impedance state without a current loop.

7. A long-life intelligent carbon monoxide sensor according to any one of claims 1 to 6, characterized in that: The sensor also includes a data storage module, an alarm module, a display module and a remote control input module; the remote control input module is connected to the microprocessor through the data storage module, and the alarm module is connected to the microprocessor through the display module; The data storage module is used to store the sensor's zero point, sensitivity, alarm point, communication address, and maximum concentration information in real time; the alarm module emits an audible and visual alarm signal when the carbon monoxide gas concentration is abnormal to remind the operator; the display module is used to display the carbon monoxide gas concentration or sensor parameter information in real time; the remote control input module is used to realize the reception of non-contact infrared signals.

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