A manhole cover loosening monitoring method and system for reducing power consumption

Abstract

The present application belongs to the technical field of electric power tunnel, and provides a manhole cover loosening monitoring method and system for reducing power consumption, which determines whether to wake up the control unit in the control monitoring system through acquisition and judgment of the vibration signal, specifically, when the vibration signal exceeds the set threshold, the control unit in the control monitoring system enters the normal working state, otherwise, the control unit in the control monitoring system enters the sleep state, after the vibration signal is less than the threshold or disappears, the control unit in the control monitoring system can be controlled to enter the sleep state in time to reduce or close the loosening monitoring, the purpose of reducing power consumption is achieved; at the same time, whether to accumulate the loosening times is determined according to the under-damped motion and the vibration period, the filtering of the normal passing of the vehicle and the judgment of the loosening event are achieved, the loosening misjudgment situation is avoided, and the accuracy of the loosening monitoring grade classification is improved.

Description

Technical Field

[0001] This invention belongs to the field of power tunnel technology, and in particular relates to a method and system for monitoring loose manhole covers to reduce power consumption. Background Technology

[0002] Manhole covers are a common sight in people's lives, and their presence on streets and alleys significantly impacts pedestrian safety. In recent years, there have been numerous accidents caused by loose manhole covers on roads, streets, and in tunnels, and the increasing number of manhole cover hazards has also affected pedestrians' psychological well-being. Loose manhole covers can cause serious injuries to pedestrians and vehicles, making the monitoring of manhole cover loosening particularly important.

[0003] The inventors discovered that traditional manhole cover loosening detection often uses accelerometer chips, but most of these chips only monitor the tilt of the manhole cover. The problems and difficulties are twofold: first, it is difficult to distinguish between normal vehicle traffic, which can easily cause false alarms and affect the accuracy of monitoring; second, it is difficult to control power consumption. When deployed in areas with heavy traffic, the manhole cover sensor is frequently woken up, resulting in significant battery drain and severely affecting the service life of the manhole cover loosening detection equipment. This not only affects the lifespan of the equipment but also increases the maintenance costs associated with battery replacement. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a method and system for monitoring loose manhole covers to reduce power consumption. On the one hand, this invention can filter out vehicles passing normally through intelligent algorithms; on the other hand, after confirming that a manhole cover is loose, it can promptly reduce or turn off the looseness monitoring to achieve the goal of reducing power consumption.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides a manhole cover loosening monitoring system that achieves reduced power consumption, including a control unit and at least one sensor connected to the control unit;

[0007] The sensor is configured to acquire vibration signals from the manhole cover;

[0008] The control unit is configured to: if the vibration signal exceeds a set threshold, the control unit enters normal operation mode; otherwise, the control unit enters sleep mode. After the control unit enters normal operation mode, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration cycle. The loosening level of the manhole cover is determined based on the accumulated number of loosenings.

[0009] Furthermore, the sensors include an accelerometer, a harmful gas monitoring unit, a temperature and humidity monitoring unit, and a water level monitoring unit.

[0010] Furthermore, the control unit is also connected to a GPS module.

[0011] Furthermore, the vibration signal is used to determine whether the motion is underdamped. If the motion is underdamped and the vibration period is greater than the set value, the number of loosening events is accumulated; otherwise, the number of loosening events is not accumulated.

[0012] Furthermore, when the vibration amplitude in the vibration signal decreases exponentially over time, it is identified as underdamped motion.

[0013] Furthermore, the acceleration value of the manhole cover is continuously acquired by an accelerometer until the change in acceleration is less than a set range, and the vibration signal is calculated; the vibration signal is the time from the start of vibration to the end of vibration.

[0014] Furthermore, the vibration signal is used to determine whether the motion is underdamped. In the case of non-underdamped motion, if the vibration duration exceeds the set value, the control unit in the monitoring system enters a sleep state.

[0015] Furthermore, in the non-underdamped motion state, if the vibration duration exceeds the set value, the control unit in the monitoring system will enter the normal working state every preset time, record a set of loosening times, and clear the loosening count.

[0016] Furthermore, based on the loosening count and working time, the loosening level of the manhole cover is determined; the loosening level includes warning, alarm, and serious alarm.

[0017] Secondly, the present invention also provides a method for monitoring loose manhole covers with reduced power consumption, using the manhole cover loosening monitoring system with reduced power consumption as described in the first aspect, comprising:

[0018] Obtain vibration signals from the manhole cover;

[0019] If the vibration signal exceeds the set threshold, the control unit in the control monitoring system will enter the normal working state; otherwise, the control unit in the control monitoring system will enter the sleep state.

[0020] After the control unit enters normal working state, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration period;

[0021] The loosening level of the manhole cover is determined based on the cumulative number of loosening occurrences.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. In this invention, the control unit in the control monitoring system is activated by acquiring and judging the vibration signal. Specifically, when the vibration signal exceeds a set threshold, the control unit in the control monitoring system enters a normal working state; otherwise, the control unit enters a sleep state. When the vibration signal is less than the threshold or disappears, the loosening monitoring can be reduced or turned off in a timely manner by having the control unit in the control monitoring system enter a sleep state, thereby reducing power consumption. At the same time, the number of loosening events is accumulated based on the underdamped motion and vibration period, which filters out normal vehicle passage and judges loosening events, avoids misjudgment of loosening, and improves the accuracy of loosening monitoring level classification.

[0024] 2. In this invention, under underdamped motion, if the vibration period is greater than the set value, it is considered to cause a loosening event, and the number of loosening events is accumulated; otherwise, it is considered to be a normal vehicle passage event, and the number of loosening events is not accumulated.

[0025] 3. In the present invention, if the vibration duration exceeds the set value during non-underdamped motion, the control unit in the monitoring system enters a sleep state, which avoids the power consumption caused by the control unit being triggered by vibrations caused by construction, etc., and further saves power consumption. At the same time, the control unit in the monitoring system enters a normal working state every preset time, records a set of loosening counts, and clears the loosening count, ensuring normal and effective monitoring of the manhole cover. Attached Figure Description

[0026] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0027] Figure 1 This is a structural framework diagram of Embodiment 1 of the present invention;

[0028] Figure 2 This is a flowchart of Embodiment 2 of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] Example 1:

[0032] Traditional manhole cover loosening monitoring systems suffer from two main problems: first, they struggle to distinguish between normal vehicle traffic and false alarms, affecting monitoring accuracy; second, power consumption is difficult to control. In high-traffic areas, frequent sensor activation leads to significant battery drain, severely impacting the lifespan of the monitoring equipment and increasing maintenance costs associated with battery replacements. To address these issues, this embodiment provides a manhole cover loosening monitoring system with reduced power consumption, comprising a control unit and at least one sensor connected to the control unit.

[0033] The sensor is configured to acquire vibration signals from the manhole cover;

[0034] The control unit is configured to: if the vibration signal exceeds a set threshold, the control unit enters normal operation mode; otherwise, the control unit enters sleep mode. After the control unit enters normal operation mode, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration cycle. The loosening level of the manhole cover is determined based on the accumulated number of loosenings.

[0035] Specifically, when the vibration signal exceeds the set threshold, the control unit in the monitoring system enters normal operation; otherwise, the control unit enters sleep mode. When the vibration signal is less than the threshold or disappears, the loosening monitoring can be reduced or turned off in a timely manner by controlling the control unit to enter sleep mode, thus reducing power consumption. At the same time, the system determines whether to accumulate the number of loosening events based on the underdamped motion and vibration cycle, thereby filtering out vehicles that pass normally and judging loosening events. This avoids false alarms caused by misjudgment of loosening and improves the accuracy of loosening monitoring level classification and alarm.

[0036] Optionally, the monitoring system in this embodiment can be a traditional manhole cover monitoring system; in other embodiments, a low-power monitoring system for manhole cover loosening is provided, including an MCU control unit, and an NB communication module, GPS module, accelerometer, harmful gas monitoring unit, temperature and humidity monitoring unit and water level monitoring unit connected to the MCU control unit, and also including a high-capacity battery.

[0037] Specifically, the NB communication module enables communication with the platform and status reporting via the NB-IoT module; the GPS module provides location positioning, reporting coordinates when the manhole cover is lost; the accelerometer monitors for abnormal opening and loosening of the manhole cover; the hazardous gas monitoring unit monitors methane levels under the manhole cover; temperature and humidity monitoring monitors the temperature and humidity under the manhole cover; and water level monitoring monitors the water level in the manhole. A high-capacity battery powers the manhole cover terminal, allowing for 5 years of operation without battery replacement.

[0038] Optionally, an acceleration threshold can be set via an accelerometer. When vibration is detected and the vibration signal exceeds the threshold, the MCU control unit is triggered to wake up and enter normal working state. When there is no trigger signal, the MCU control unit is in sleep state, which can greatly reduce the power consumption of the terminal.

[0039] In this embodiment, the vibration signal is used to determine whether the movement is underdamped. If it is underdamped and the vibration period is greater than a set value, the number of loosening events is accumulated; otherwise, the number of loosening events is not accumulated. When the vibration amplitude in the vibration signal decreases exponentially over time, it is identified as underdamped movement. The acceleration value of the manhole cover is continuously acquired by an accelerometer until the acceleration change threshold is less than a set range, and the vibration signal is calculated; the vibration signal is the time from the start to the end of the vibration.

[0040] Specifically, after the MCU control unit is triggered and woken up, it continuously reads the acceleration value of the accelerometer until the vertical acceleration change threshold is less than the set range, and calculates the vibration period T1 of this round. The vibration period T1 is the time from the start of vibration to the end of vibration.

[0041] The MCU control unit simultaneously calculates the peaks and troughs of acceleration to determine whether the manhole cover is undergoing underdamped motion. If the vibration amplitude is detected to decrease exponentially over time, it is identified as underdamped motion.

[0042] If the motion is determined to be underdamped and the vibration period T1 is greater than the set value, the number of loosening events is incremented by 1 to accumulate the count; if the motion is determined to be underdamped and the vibration period T1 is less than the set value, the number of loosening events is not recorded and the current state is set to warning.

[0043] The system determines whether the movement is underdamped based on the vibration signal. In the non-underdamped state, if the vibration duration exceeds a set value, the control unit in the monitoring system enters a sleep state. In the non-underdamped state, if the vibration duration exceeds the set value, the control unit in the monitoring system enters normal operation every preset time interval, records a set of loosening counts, and then clears the loosening count.

[0044] This avoids power consumption issues caused by vibrations during construction, thus preventing the control unit from being triggered. Simultaneously, the control unit in the monitoring system enters normal operation at preset intervals, records a set of loosening events, and clears the loosening count, ensuring effective monitoring of the manhole cover. Optionally, if the vibration is determined to be non-underdamped and continues for more than a set duration, the shutdown time parameter can be set, indicating that the vibration is triggered by construction. In this case, the loosening monitoring function is temporarily disabled to save power. Every 2 hours, the MCU control unit automatically triggers, records a set of loosening events, and clears the loosening count.

[0045] Based on the loosening count and working time, the loosening level of the manhole cover is determined; the loosening level includes warning, alarm, and critical alarm; appropriate measures are taken according to the loosening level to ensure the safe operation of the manhole cover. Optionally, the loosening level can be determined by counting loosening counts from 12 sets per day (one set is counted every 2 hours), and each set of loosening counts is statistically analyzed. Specifically:

[0046] When the number of groups that count more than once is less than or equal to one, the loose state of the manhole cover is normal.

[0047] When the number of groups that count more than once is greater than 1 and less than or equal to 3, the manhole cover is in a loose state, which is a warning sign.

[0048] When the number of groups that count more than once is greater than 3 and less than or equal to 6, the manhole cover is in a loose state and an alarm is triggered.

[0049] When the count exceeds 1 time and the number of groups exceeds 6 times, the manhole cover loosening status is a serious alarm.

[0050] This embodiment effectively filters out vehicles passing normally, and upon confirming a loose manhole cover, it provides an appropriate level of looseness and promptly reduces or disables looseness monitoring to lower power consumption. This embodiment achieves effective monitoring of manhole cover looseness, ensuring the safe movement of manhole covers in place and thus guaranteeing road safety.

[0051] Example 2:

[0052] This embodiment provides a method for monitoring loose manhole covers with reduced power consumption, using the manhole cover loosening monitoring system with reduced power consumption as described in Embodiment 1, including:

[0053] Obtain vibration signals from the manhole cover;

[0054] If the vibration signal exceeds the set threshold, the control unit in the control monitoring system will enter the normal working state; otherwise, the control unit in the control monitoring system will enter the sleep state.

[0055] After the control unit enters normal working state, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration period;

[0056] The loosening level of the manhole cover is determined based on the cumulative number of loosening events.

[0057] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A manhole cover loosening monitoring system that achieves reduced power consumption, characterized in that, Includes a control unit and at least one sensor connected to the control unit; The sensor is configured to acquire vibration signals from the manhole cover; The control unit is configured to: if the vibration signal exceeds a set threshold, the control unit enters normal operation mode; otherwise, the control unit enters sleep mode. After the control unit enters normal operation mode, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration cycle. The loosening level of the manhole cover is determined based on the accumulated number of loosenings. The vibration signal is used to determine whether the motion is underdamped. If it is underdamped and the vibration period is greater than the set value, the number of loosening events is accumulated; otherwise, the number of loosening events is not accumulated. The vibration signal is used to determine whether the motion is underdamped. If the vibration duration exceeds the set value in the non-underdamped motion state, the control unit in the control monitoring system will enter a sleep state.

2. The manhole cover loosening monitoring system as described in claim 1, characterized in that, The sensors include an accelerometer, a harmful gas monitoring unit, a temperature and humidity monitoring unit, and a water level monitoring unit.

3. The manhole cover loosening monitoring system as described in claim 1, characterized in that, The control unit is also connected to a GPS module.

4. The manhole cover loosening monitoring system as described in claim 1, characterized in that, When the vibration amplitude in the vibration signal decreases exponentially over time, it is identified as underdamped motion.

5. A manhole cover loosening monitoring system with reduced power consumption as described in claim 1, characterized in that, The acceleration value of the manhole cover is continuously acquired by an accelerometer until the change in acceleration is less than the set range, and the vibration signal is calculated; the vibration signal is the time from the start of vibration to the end of vibration.

6. A manhole cover loosening monitoring system with reduced power consumption as described in claim 1, characterized in that, In non-underdamped motion, if the vibration duration exceeds the set value, the control unit in the monitoring system will enter normal working state every preset time, record a set of loosening counts, and clear the loosening count.

7. A manhole cover loosening monitoring system with reduced power consumption as described in claim 1, characterized in that, The loosening level of the manhole cover is determined based on the number of loosenings and the working time; the loosening level includes warning, alarm, and serious alarm.

8. A method for monitoring loose manhole covers with reduced power consumption, characterized in that, The manhole cover loosening monitoring system as described in any one of claims 1-7, comprising: Obtain vibration signals from the manhole cover; If the vibration signal exceeds the set threshold, the control unit in the control monitoring system will enter the normal working state; otherwise, the control unit in the control monitoring system will enter the sleep state. After the control unit enters normal working state, it determines whether to accumulate the number of loosenings based on the underdamped motion and vibration period; The loosening level of the manhole cover is determined based on the cumulative number of loosening occurrences.

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