Low-power adaptive control method for coal mine underground gas detection sensor

Abstract

This invention discloses a low-power adaptive control method for a coal mine underground gas detection sensor, comprising the following steps: Step S1, real-time acquisition of underground gas concentration and gas concentration change rate; Step S2, comparison of the acquired gas concentration and gas concentration change rate with corresponding thresholds to classify the current underground gas conditions; Step S3, low-power adaptive control of the sensor based on the current underground gas conditions; Step S4, acquisition of the sensor's real-time operating current and correction of the sensor's real-time operating current. This invention provides a low-power adaptive control method for a coal mine underground gas detection sensor, which, through condition classification, low-power adaptive control, and current closed-loop self-correction, balances low power consumption and detection accuracy requirements while meeting normal operation requirements.

Description

Technical Field

[0001] This invention relates to a low-power adaptive control method for underground gas detection sensors in coal mines, belonging to the field of coal mine safety monitoring technology. Background Technology

[0002] The underground working environment in coal mines is complex, containing flammable, explosive, toxic, and harmful gases such as methane, carbon monoxide, and carbon dioxide. It is necessary to deploy a large number of gas detection sensors to collect underground gas concentrations in real time, providing data support for underground ventilation, hazard avoidance, early warning, and safe production.

[0003] Currently, gas detection sensors in coal mines are powered by intrinsically safe power supplies. However, the output power of these intrinsically safe power supplies is subject to mandatory regulations, typically not exceeding 25W. One intrinsically safe power supply must simultaneously power the sensor and its associated equipment. Therefore, this places high demands on the power consumption of the gas detection sensor itself. Excessive power consumption can prevent the intrinsically safe power supply from driving the sensor properly, leading to inaccurate gas concentration detection and posing a safety hazard to underground operations. Furthermore, underground gas detection sensors must strictly adhere to explosion-proof intrinsically safe equipment specifications, typically operating within a DC 9V to 24V range, with a rated operating current generally not exceeding 200mA.

[0004] Therefore, how to achieve a balance between low power consumption and detection performance without significantly degrading the performance of underground gas detection sensors in coal mines is an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a low-power adaptive control method for underground gas detection sensors in coal mines. This method uses working condition classification, low-power adaptive regulation, and current closed-loop self-calibration to meet both low power consumption and detection accuracy requirements while ensuring normal operation.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A low-power adaptive control method for a gas detection sensor in underground coal mines includes the following steps: Step S1: Real-time acquisition of downhole gas concentration and gas concentration change rate; Step S2: Compare the collected gas concentration and gas concentration change rate with the corresponding thresholds to classify the current downhole gas conditions; Step S3: Perform low-power adaptive adjustment of the sensor according to the current downhole gas conditions; Step S4: Collect the real-time operating current of the sensor and calibrate the real-time operating current of the sensor.

[0007] Furthermore, in step S2, the collected gas concentration and gas concentration change rate are compared with the corresponding thresholds to classify the current downhole gas conditions; specifically, this includes the following steps: Set a gas warning threshold, a gas alarm threshold, and a concentration change rate range, wherein the concentration change rate range includes a low change rate range, a moderately low change rate range, and a dangerous change rate range; If the gas concentration is less than the gas warning threshold and the concentration change rate is in the low change rate range, then the current downhole gas condition is determined to be a normal steady-state condition. If the gas warning threshold is less than or equal to the gas concentration and the gas alarm threshold is less than the gas concentration, and the concentration change rate is in the range of medium to low change rate, then the current downhole gas condition is determined to be a warning fluctuation condition. If the gas alarm threshold is less than or equal to the gas concentration, and the concentration change rate is within the dangerous change rate range, then the current downhole gas condition is determined to be an over-limit dangerous condition.

[0008] Furthermore, in step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the normal steady-state operating conditions, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; Set the gas sensor sampling period to 60 seconds per cycle; The MCU module enters a deep sleep state, sets the MCU module to Standby mode, shuts down the 1.8V domain power supply, and retains the power supply for the MCU module's RTC real-time clock and external wake-up pin.

[0009] Furthermore, in step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the aforementioned warning fluctuation condition, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; Set the gas sensor sampling period to 10 seconds per time; The MCU module enters a shallow sleep state, sets the MCU module to Stop mode, shuts down the main clock, retains the 1.8V domain power supply, preserves the contents of SRAM and registers, and the wake-up source is the EXTI interrupt.

[0010] Furthermore, in step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the aforementioned dangerous operating conditions, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn on all modules of the sensor; Set the gas sensor sampling period to 1 second / time; The MCU module remains in normal working order.

[0011] Furthermore, in step S4, the real-time operating current of the sensor is acquired, and the real-time operating current of the sensor is calibrated; specifically, this includes the following steps: Step S41: Set the upper limit threshold of the operating current and compare the real-time operating current of the sensor with the upper limit threshold of the operating current. Step S42: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, then maintain the low-power adaptive control method in step S3. Step S43: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, reduce the gas sensing sampling frequency and extend the sleep time of the MCU module.

[0012] Furthermore, the upper limit threshold of the operating current is 200mA.

[0013] By adopting the above technical solution, this invention achieves a balance between low power consumption and detection performance through a three-level working condition classification judgment, low-power adaptive control under three working conditions, and current closed-loop self-calibration. This meets safety standards and downhole safety production requirements, balancing low power consumption, detection accuracy, and real-time hazard response. No hardware modifications are required, resulting in low engineering implementation costs and strong applicability. Attached Figure Description

[0014] Figure 1 This is a flowchart of the low-power adaptive control method for underground gas detection sensors in coal mines according to the present invention. Detailed Implementation

[0015] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] like Figure 1 As shown in the figure, this embodiment provides a low-power adaptive control method for a gas detection sensor in underground coal mines, including the following steps: Step S1: Real-time acquisition of downhole gas concentration and gas concentration change rate.

[0017] Step S2: Compare the collected gas concentration and gas concentration change rate with the corresponding thresholds to classify the current downhole gas conditions. Specifically: Set gas warning thresholds, gas alarm thresholds, and concentration change rate ranges. The concentration change rate ranges include low change rate ranges, medium-low change rate ranges, and dangerous change rate ranges.

[0018] If the gas concentration is less than the gas warning threshold and the rate of change of concentration is in the low rate of change range, it means that the downhole gas concentration is normal and without fluctuation, and has been stable in the safe range for a long time. Therefore, the current downhole gas condition is judged to be a normal steady-state condition.

[0019] If the gas warning threshold is less than or equal to the gas concentration but less than the gas alarm threshold, and the concentration change rate is in the low to medium range, it indicates that the downhole gas concentration is close to the warning line and the concentration is slowly rising. In this case, the current downhole gas condition is determined to be a warning fluctuation condition.

[0020] If the gas alarm threshold is less than or equal to the gas concentration, and the concentration change rate is within the dangerous change rate range, it indicates that the downhole gas concentration exceeds the limit and the change rate is large, requiring immediate alarm linkage. In this case, the current downhole gas condition is determined to be an over-limit dangerous condition.

[0021] Step S3: Perform low-power adaptive adjustment of the sensor based on the current downhole gas conditions. Specifically: 1. Under normal steady-state operating conditions, perform low-power adaptive regulation. The regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; turn off all idle and redundant peripherals, and keep only the gas sensor acquisition, MCU module, and data upload module working normally.

[0022] By setting the gas sensor sampling period to 60 seconds per cycle and extending the task scheduling cycle, the MCU module's sleep time is maximized, resulting in the lowest overall power consumption.

[0023] The MCU module enters a deep sleep state, sets the MCU module to Standby mode, shuts off the 1.8V domain power supply, does not retain the contents of SRAM and registers, retains the power supply of the MCU module's RTC real-time clock and external wake-up pin, and the wake-up source is limited to the RTC real-time clock and external wake-up pin. After waking up, the system resets the sampling.

[0024] 2. Under the condition of early warning fluctuation, low-power adaptive regulation is performed. The regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; turn off all idle and redundant peripherals, and keep only the gas sensor acquisition, MCU module, and data upload module working normally.

[0025] The gas sensing sampling period is set to 10 seconds per cycle to balance power consumption and trend capture, avoiding high-frequency power consumption.

[0026] The MCU module enters a shallow sleep state, sets the MCU module to Stop mode, shuts down the main clock, retains the 1.8V domain power supply, preserves the contents of SRAM and registers, and wakes up from the EXTI interrupt (such as GPIO, RTC real-time clock). After waking up, there is no need to reinitialize peripherals.

[0027] 3. Under dangerous operating conditions exceeding limits, low-power adaptive regulation is implemented. The regulation process includes the following steps: Turn on all modules of the sensor.

[0028] The gas sensor sampling period is set to 1 second / time to meet the real-time requirements of downhole safety alarms.

[0029] The MCU module maintains normal operation, with its power fully on to detect gas concentration, upload detection data, and display alarms.

[0030] Step S4: Acquire the real-time operating current of the sensor and calibrate the real-time operating current of the sensor. Specifically: Step S41: Set the upper limit threshold of the operating current. Compare the real-time operating current of the sensor with the upper limit threshold of the operating current. In this embodiment, the upper limit threshold of the operating current is 200mA.

[0031] Step S42: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, then maintain the low-power adaptive control method in step S3.

[0032] Step S43: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, reduce the gas sensing sampling frequency and extend the sleep time of the MCU module to constrain the real-time operating current within the upper limit threshold of the operating current.

[0033] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-power adaptive control method for a coal mine underground gas detection sensor, characterized in that, Includes the following steps: Step S1: Real-time acquisition of downhole gas concentration and gas concentration change rate; Step S2: Compare the collected gas concentration and gas concentration change rate with the corresponding thresholds to classify the current downhole gas conditions; Step S3: Perform low-power adaptive adjustment of the sensor according to the current downhole gas conditions; Step S4: Collect the real-time operating current of the sensor and calibrate the real-time operating current of the sensor.

2. The low-power adaptive control method for underground gas detection sensors in coal mines according to claim 1, characterized in that, In step S2, the collected gas concentration and gas concentration change rate are compared with the corresponding thresholds to classify the current downhole gas conditions; specifically, this includes the following steps: Set a gas warning threshold, a gas alarm threshold, and a concentration change rate range, wherein the concentration change rate range includes a low change rate range, a moderately low change rate range, and a dangerous change rate range; If the gas concentration is less than the gas warning threshold and the concentration change rate is in the low change rate range, then the current downhole gas condition is determined to be a normal steady-state condition. If the gas warning threshold is less than or equal to the gas concentration and the gas alarm threshold is less than the gas concentration, and the concentration change rate is in the range of medium to low change rate, then the current downhole gas condition is determined to be a warning fluctuation condition. If the gas alarm threshold is less than or equal to the gas concentration, and the concentration change rate is within the dangerous change rate range, then the current downhole gas condition is determined to be an over-limit dangerous condition.

3. The low-power adaptive control method for coal mine underground gas detection sensor according to claim 2, characterized in that, In step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the normal steady-state operating conditions, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; Set the gas sensor sampling period to 60 seconds per cycle; The MCU module enters a deep sleep state, sets the MCU module to Standby mode, shuts down the 1.8V domain power supply, and retains the power supply for the MCU module's RTC real-time clock and external wake-up pin.

4. The low-power adaptive control method for coal mine underground gas detection sensor according to claim 3, characterized in that, In step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the aforementioned warning fluctuation condition, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn off all peripheral modules except the gas sensor acquisition module, MCU module, and communication upload module; Set the gas sensor sampling period to 10 seconds per time; The MCU module enters a shallow sleep state, sets the MCU module to Stop mode, shuts down the main clock, retains the 1.8V domain power supply, preserves the contents of SRAM and registers, and the wake-up source is the EXTI interrupt.

5. The low-power adaptive control method for coal mine underground gas detection sensor according to claim 4, characterized in that, In step S3, the sensor is adaptively adjusted for low power consumption based on the current downhole gas conditions; specifically, this includes the following steps: Under the aforementioned dangerous operating conditions, low-power adaptive regulation is performed, and the regulation process includes the following steps: Turn on all modules of the sensor; Set the gas sensor sampling period to 1 second / time; The MCU module remains in normal working order.

6. The low-power adaptive control method for coal mine underground gas detection sensor according to claim 1, characterized in that, In step S4, the real-time operating current of the sensor is collected, and the real-time operating current of the sensor is calibrated; specifically, the following steps are included: Step S41: Set the upper limit threshold of the operating current and compare the real-time operating current of the sensor with the upper limit threshold of the operating current. Step S42: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, then maintain the low-power adaptive control method in step S3. Step S43: If the real-time operating current of the sensor reaches the upper limit threshold of the operating current, reduce the gas sensing sampling frequency and extend the sleep time of the MCU module.

7. The low-power adaptive control method for coal mine underground gas detection sensor according to claim 6, characterized in that, The upper limit threshold for the operating current is 200mA.

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