On-line monitoring system and method for fuel oil of flowing machine

Abstract

The invention discloses an on-line monitoring system and method for fuel oil of a flowing machine. The system comprises a liquid level monitor, a vehicle-mounted positioning terminal and an irregular closed space liquid level on-line monitoring platform which are connected in sequence. The liquid level monitor comprises a liquid level sensor arranged in the irregular closed oil tank and a liquid level recording instrument arranged at the top end of the irregular closed oil tank and connected with the liquid level sensor in a wired mode. The vehicle-mounted positioning terminal comprises an Internet of Things module, a vehicle-mounted Bluetooth module, an FPC antenna, a GPS + Beidou + LBS positioning module, a parameter sensor and a vehicle-mounted microprocessor, wherein the vehicle-mounted microprocessor is connected with the GPS + Beidou + LBS positioning module, the parameter sensor, the Internet of Things module, the vehicle-mounted Bluetooth module and the FPC antenna. According to the invention, the real-time monitoring of the full-capacity change of the liquid material in the movable closed space and the monitoring and management of the position movement of the engineering machinery can be realized, and the problems of cost waste and difficult management under abnormal conditions are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel monitoring for mobile machinery, and particularly to an on-line fuel monitoring system and method for mobile machinery. Background Art

[0002] During the operation of various engineering machinery in the process of mechanical engineering operations, the fuel tanks generally have the characteristics of large volume, irregular shape, low installation position close to the ground and easy to be scratched, small clearance with other parts, and harsh working environment.

[0003] Therefore, during the operation of construction machinery, the following problems are often encountered:

[0004] 1. During the operation of construction machinery, due to the complex working environment, it is not easy to detect the phenomenon of fuel leakage caused by fuel tank scratching.

[0005] 2. The fuel tank has a large volume and an irregular shape. When the liquid level drops by less than 1%, the traditional float-based sensor cannot sense it, and the ultrasonic sensor cannot be installed outside the fuel tank. As a result, it is not easy to detect non-production operation consumption and human malicious transfer.

[0006] 3. Inaccurate liquid level monitoring leads to abnormal data changes, causing difficulties in the management of production materials, and increasing the burden and management cost in the management process. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an on-line fuel monitoring system and method for mobile machinery to solve the problems of abnormal production cost waste and difficult management caused by the large volume, irregular shape, easy scratching of the installation position, small clearance with other parts, and harsh working environment of the fuel tanks of various construction machinery.

[0008] To solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0009] An on-line fuel monitoring system for mobile machinery includes a liquid level monitor, a vehicle-mounted positioning terminal, and an on-line liquid level monitoring platform for an irregular sealed space, which are connected in sequence;

[0010] The liquid level monitor includes a liquid level sensor disposed in an irregular sealed fuel tank for monitoring the fuel pressure, temperature, and tilt angle, and a liquid level recorder disposed at the top of the irregular sealed fuel tank and connected to the liquid level sensor in a wired manner; the liquid level recorder includes a liquid level microprocessor wired to the liquid level sensor, and the liquid level microprocessor forms a network with the vehicle-mounted positioning terminal through a built-in liquid level Bluetooth module and an external polarized antenna;

[0011] The vehicle-mounted positioning terminal includes an Internet of Things module, a vehicle-mounted Bluetooth module, an FPC antenna, a GPS+Beidou+LBS positioning module for collecting the longitude and latitude of construction machinery to obtain the current position, a parameter sensor for collecting construction machinery parameters, and a vehicle-mounted microprocessor respectively connected to the GPS+Beidou+LBS positioning module, the parameter sensor, the Internet of Things module, the vehicle-mounted Bluetooth module, and the FPC antenna; the vehicle-mounted microprocessor is connected to the liquid level recorder through the vehicle-mounted Bluetooth module and the FPC antenna to receive the pressure, temperature, and tilt angle data monitored by the liquid level recorder and calculate the volume of fuel in the irregular sealed fuel tank based on the pressure, temperature, and tilt angle data to achieve fuel liquid level measurement. The vehicle-mounted microprocessor obtains the current position based on the data monitored by the GPS+Beidou+LBS positioning module and the parameter sensor and calculates the current state of the construction machinery as approaching the site, normal driving, or leaving the site. The vehicle-mounted microprocessor is connected to the irregular sealed space liquid level online monitoring platform through the Internet of Things module.

[0012] Preferably, both the liquid level sensor and the liquid level recorder adopt nylon shells, and a lithium battery module for supplying power to the liquid level sensor and the liquid level recorder is arranged inside the nylon shell of the liquid level recorder; the liquid level sensor includes a pressure sensor for monitoring pressure, a temperature sensor for monitoring temperature, and an inclination sensor for monitoring the tilt angle.

[0013] Preferably, the parameter sensor includes, but is not limited to, an acceleration sensor for collecting the acceleration of construction machinery, an angular velocity sensor for collecting the angular velocity of construction machinery, and a vibration amplitude sensor for collecting the vibration amplitude of construction machinery.

[0014] Preferably, the vehicle-mounted positioning terminal adopts a modified ASA material shell, the vehicle-mounted positioning terminal is installed under the visible window of the operation room of the construction machinery or on the upper side of the operation room ceiling, the vehicle-mounted positioning terminal further includes a battery module, and a photovoltaic module connected to the battery module for realizing solar charging is arranged on the vehicle-mounted positioning terminal.

[0015] Preferably, the irregular sealed space liquid level online monitoring platform includes a fuel consumption monitoring subsystem for realizing construction machinery monitoring, fuel filling volume report service, fuel consumption report, fuel filling volume comparison, work detail list, early warning information management, basic information configuration service, fuel filling volume import, permission configuration, and large screen display, and a vehicle positioning and electronic fence subsystem for realizing electronic tags, electronic fences, real-time positioning of construction machinery, construction machinery trajectory tracking, construction machinery position alarm, and data storage.

[0016] A method for online monitoring of fuel for mobile machinery includes the following steps:

[0017] S1. Collect data on fuel pressure, temperature, and tilt angle, and at the same time, collect data on the longitude and latitude, acceleration, angular velocity, and amplitude of the construction machinery;

[0018] S2. Substitute the fuel pressure, temperature, and tilt angle data into the Boyle-Mariotte law formula in the form of parameters to convert the pressure value into the "liter" value of volume to achieve fuel liquid level measurement; at the same time, obtain the current location based on the longitude and latitude of the construction machinery, and calculate the current state of the construction machinery, whether it is entering the site, normal driving, or leaving the site, with the support of acceleration data, angular velocity, and amplitude data;

[0019] S3. Combine the fuel volume data, construction machinery location data, and status data in step S2 with the electronic map fence annotation, and display the current changes in liquid fuel, working location, and working status of the construction machinery to the construction machinery management department on an hourly basis. Combine the liquid fuel change data and working status data to push a prompt for suspicious fuel changes, and combine the current location data and electronic fence data to push a prompt for whether the working area has been exceeded.

[0020] Preferably, the Boyle-Mariotte law formula in step S2 is PV = K, where P is the liquid pressure value; V is the liquid volume value; experimentally measure the change difference of the K value under different temperature conditions, and combine the least squares method, BP neural network method, and regression method to correct the influence of temperature on the measurement result; experimentally measure the different pressures under different angles for a certain volume, and perform linear fitting through the least squares method to calculate the measurement error caused by tilt, and perform corresponding data correction.

[0021] Due to the adoption of the above technical solutions, the technical progress achieved by the present invention is as follows.

[0022] The present invention collects data on the pressure, temperature, and tilt angle of the irregular closed fuel tank of the construction machinery through a pressure sensor, temperature sensor, tilt angle sensor, and liquid level recorder, and realizes the collection of data in an irregular high-shielded space through a wired method, and controls the error within ±0.1 liter, solving the problem that traditional construction machinery cannot accurately remotely monitor fuel changes.

[0023] The present invention redesigns the vehicle-mounted positioning terminal. After integrating a microprocessor and a GPS+Beidou+LBS positioning module, it realizes the calculation of volume-pressure conversion data, the calculation of construction machinery status data, the management of the power supply data of the monitoring device, and the upload of relevant data;

[0024] The present invention combines the on-line monitoring platform for the liquid level in the irregular closed space with the vehicle-mounted positioning terminal to collect data and calculate data, realizes the analysis of the fuel change during the operation of the construction machinery, the real-time judgment of the working state and non-working state, and the electronic alarm for leaving the working area, fundamentally solving the waste of unnecessary working costs and abnormal fuel losses.

[0025] In terms of data transmission, the present invention adopts BLE 5.0 Bluetooth technology and realizes a controllable self-organizing network method with a communication distance within 3.5 meters and a transmission rate of 2M + 2G / 4G / 5G communication method + GPS + Beidou + LBS positioning method through a secondary controllable programming method, minimizing the occurrence of errors in the data communication process and faults such as interference and delay generated between different devices in data communication.

[0026] In summary, according to the characteristics of the special structure of construction machinery, the complexity of the application field, and the poor operating environment, the present invention proposes a method for collecting and calculating liquid level pressure data in an airtight irregular space, obtains a calculation method for the volume of oil in the space, and avoids the problem of data shielding in a high-airtight space. At the same time, the on-vehicle positioning terminal, data calculation gateway, and data communication gateway are integrated in design, successfully solving the problems of difficult real-time management and waste of production materials during the operation of construction machinery, and improving the input-output ratio of construction machinery. Brief Description of the Drawings

[0027] Figure 1 is the architecture diagram of the system of the present invention;

[0028] Figure 2 is the installation schematic diagram of the liquid level sensor of the present invention in an irregular airtight box;

[0029] Figure 3 is the installation schematic diagram of the liquid level recorder of the present invention on the cover of an irregular airtight box;

[0030] Figure 4 is the schematic diagram of the pressure measurement principle + temperature compensation + tilt angle compensation of the present invention. Detailed Embodiments

[0031] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0032] A fuel online monitoring system for mobile machinery, in combination with Figure 1 As shown, it includes a liquid level monitor, an on-vehicle positioning terminal, and an online liquid level monitoring platform for an irregular airtight space. The liquid level monitor, the on-vehicle positioning terminal, and the online liquid level monitoring platform for an irregular airtight space are connected in sequence to realize data transmission.

[0033] The liquid level monitor includes a liquid level sensor and a liquid level recorder. As Figure 2 shown, the liquid level sensor is arranged in an irregular airtight fuel tank. The liquid level sensor includes a pressure sensor, a temperature sensor, and an inclination sensor. Among them, the pressure sensor is used to monitor the oil pressure; the temperature sensor is used to monitor the oil temperature; the inclination sensor is used to monitor the oil inclination angle.

[0034] AsFigure 3 As shown, the liquid level recorder is set at the top of the irregular sealed fuel tank, and the liquid level recorder is connected to the liquid level sensor in a wired manner. Considering the characteristics of thick metal fuel tanks and strong sealing performance in construction machinery and engineering operation vehicles, through wired communication in the sealed irregular space, it can ensure that data transmission is not affected by the signal shielding of the metal fuel tank. Specifically, the liquid level recorder includes a liquid level microprocessor, which can be a microprocessor based on 97C51. The liquid level microprocessor is connected to the liquid level sensor in a wired manner. The liquid level microprocessor forms a network with the vehicle-mounted positioning terminal through a built-in liquid level Bluetooth module and an external polarized antenna, so as to send the monitored fuel pressure, temperature, and tilt angle data to the vehicle-mounted positioning terminal. Specifically, the liquid level Bluetooth module can be a programmable Bluetooth module of BLE5.0.

[0035] Both the liquid level sensor and the liquid level recorder adopt nylon shells. Inside the nylon shell of the liquid level recorder, there is a lithium battery module, which can be a 3x2700mAH high-density and large-capacity lithium battery module for powering the liquid level sensor and the liquid level recorder. The protection level of the liquid level recorder is IP68, the maximum acquisition frequency is 3s / time, the maximum measurable depth is ≥3 meters, the data accuracy is ≥95%, the liquid level change sensitivity is <1mm, and it can be adapted to unconventional sealed tank openings with a diameter of ≥35mm and various irregular containers.

[0036] The vehicle-mounted positioning terminal includes a battery module, an Internet of Things module, a vehicle-mounted Bluetooth module, an FPC antenna, a GPS+Beidou+LBS positioning module, a parameter sensor, and a vehicle-mounted microprocessor. The vehicle-mounted microprocessor is respectively connected to the GPS+Beidou+LBS positioning module, the parameter sensor, the Internet of Things module, the vehicle-mounted Bluetooth module, and the FPC antenna. Among them, the GPS+Beidou+LBS positioning module is used to collect the longitude and latitude of the construction machinery to obtain the current position, and the positioning accuracy is within ±10m; the parameter sensor is used to collect construction machinery parameters, including an acceleration sensor, an angular velocity sensor, an amplitude sensor, etc. Specifically, the acceleration sensor is used to collect the acceleration of the construction machinery, the angular velocity sensor is used to collect the angular velocity of the construction machinery, and the amplitude sensor is used to collect the amplitude of the construction machinery; the vehicle-mounted Bluetooth module can be a programmable Bluetooth module of BLE5.0; the Internet of Things module can be a 2G or 4G Internet of Things module; the battery module is used to power the vehicle-mounted positioning terminal and can be a 12000mAH@3.7V battery module.

[0037] The in-vehicle microprocessor can be the SIMCOM-A7670C microprocessor, which is connected to the liquid level recorder through the in-vehicle Bluetooth module and the FPC antenna, so as to receive the pressure, temperature and tilt angle data monitored by the liquid level recorder. The in-vehicle microprocessor can calculate the fuel volume in the irregular sealed fuel tank according to the pressure, temperature and tilt angle data, so as to realize the measurement of the fuel liquid level. The in-vehicle microprocessor can obtain the current position according to the data monitored by the GPS+Beidou+LBS positioning module and the parameter sensor, and calculate the current state of the construction machinery, whether it is entering the site, driving normally or leaving the site. The in-vehicle microprocessor is connected to the online monitoring platform for the liquid level in the irregular sealed space through the Internet of Things module, so as to send the fuel volume data, the position data and the state data of the construction machinery to the online monitoring platform for the liquid level in the irregular sealed space.

[0038] Due to its small volume design, the in-vehicle positioning terminal can be installed under the visible window of the operation room of the construction machinery or on the upper side of the operation room ceiling. Due to the particularity of its installation position, the shell of the in-vehicle positioning terminal is made of modified ASA material, with the size controlled within 207.5*112*36.5mm, and the waterproof level is IP68 standard. In order to support solar charging, a photovoltaic module is set on the in-vehicle positioning terminal, and the photovoltaic module is electrically connected to the battery module.

[0039] The online monitoring platform for the liquid level in the irregular sealed space includes a fuel consumption monitoring subsystem and a vehicle positioning and electronic fence subsystem. This platform can be arranged in the cloud server, or it can be arranged in the workstation of the management unit computer room in the form of computing services through the privatization method. However, the central processor of the workstation cannot be lower than 2 cores and 4G, the memory is at least 1GB or more, and the communication bandwidth cannot be lower than 3M, and it can receive data continuously for 24 hours.

[0040] Specifically, the fuel consumption monitoring subsystem includes functions such as work vehicle monitoring, fuel filling volume report service, fuel consumption report, fuel filling volume comparison, work detail list, early warning information management, basic information configuration service, fuel filling volume import, permission configuration and large screen display.

[0041] The vehicle positioning and electronic fence subsystem includes functions such as electronic tags, electronic fences, vehicle real-time positioning, vehicle trajectory tracking, vehicle position alarm, and data storage.

[0042] A method for online monitoring of fuel for mobile machinery mainly includes the following steps:

[0043] S1. Collect the fuel pressure, temperature and tilt angle data, and at the same time collect the longitude and latitude, acceleration data, angular velocity and amplitude data of the construction machinery.

[0044] Specifically, a liquid level sensor installed at the inner bottom of an irregular sealed fuel tank collects the pressure, temperature, and tilt angle of the liquid fuel in the current fuel tank, and uploads the data to a liquid level recorder in a wired communication manner; after the liquid level recorder obtains the data of the pressure, temperature, and tilt angle of the liquid fuel in the fuel tank, it uploads the data to a vehicle-mounted positioning terminal through a liquid level Bluetooth module.

[0045] S2. Substitute the data of the fuel pressure, temperature, and tilt angle into the Boyle-Mariotte law formula as parameters, convert the pressure value into the "liter" value of volume to realize the measurement of the fuel liquid level; at the same time, obtain the current position according to the longitude and latitude of the construction machinery, and calculate the current state of the construction machinery as approaching, normal driving, or leaving the site with the support of acceleration data, angular velocity, and amplitude data.

[0046] Specifically, the vehicle-mounted positioning terminal is built-in with a vehicle-mounted microprocessor. After obtaining the pressure + temperature + tilt angle uploaded by the liquid level recorder through the vehicle-mounted Bluetooth module, substitute it into the Boyle-Mariotte law formula as parameters, and convert the pressure value into the "liter" value of volume, so as to ensure that the data measurement accuracy in the irregular sealed fuel tank is within ±0.1 liter. The principle is as Figure 4 shown.

[0047] According to the Boyle-Mariotte law formula PV = K, it can be known that in any sealed space (including irregular spaces), the product K of the liquid pressure value P and the liquid volume value V is constant at an ideal temperature. Therefore, when the total liquid volume V remains unchanged, the pressure value will not change, and it will only change when the temperature in the sealed space is too high and the liquid density changes. Conversely, when the change of the K value is obtained in advance, using the inverse proportional relationship between the liquid pressure P and the volume V, the value of the volume V can be obtained. According to the volume V and the liquid density, the mass of the liquid can be calculated.

[0048] How to obtain the change of the K value, continue to derive the formula P according to the Boyle-Mariotte law 0 V 0 =K 0 ,P 1 V 1 =K 1 It can be known that when the liquid in the closed space decreases, the volume of the gas will increase, and when the volume of the gas in the space increases, the pressure becomes smaller. The liquid decreases, the gas space increases, the gas volume increases, and the pressure becomes smaller. Therefore, three K values can be obtained, namely K, K 0 ,K 1 。

[0049] Experimentally measure the change difference of the K value under different temperature conditions, and combine the least squares method, BP neural network method, and regression method to correct the influence of temperature on the measurement result.

[0050] Similarly, through experimental measurements, the pressures at different volumes under different angles of 0°, 5°, 10°... 70°, 75° are obtained, and linear fitting is performed by the least squares method to calculate the measurement error caused by tilting, and corresponding data correction is carried out.

[0051] Specifically, the vehicle-mounted positioning terminal acquires the current position of the construction machinery by collecting the longitude and latitude through the GPS + Beidou + LBS positioning module, and calculates the current state of being in the yard, normal driving or leaving the yard with the support of acceleration data, angular velocity data and amplitude data.

[0052] Finally, the vehicle-mounted positioning terminal sends the liquid material volume data in the irregular sealed fuel tank, the construction machinery position data and status data, and the power supply status data of the vehicle-mounted positioning terminal and the liquid level recorder to the online monitoring platform for the liquid level in the irregular sealed space through the vehicle-mounted Internet of Things module.

[0053] S3. Combine the volume data, the construction machinery position data and status data in step S2 with the electronic map fence annotation, and display the current liquid fuel change, working position and working status of the construction machinery to the construction machinery management department in hours. Push a suspicious fuel change prompt by combining the liquid fuel change data and the working status data, and push a prompt of whether it exceeds the working area by combining the current position data and the electronic fence data.

[0054] Specifically, the online monitoring platform for the liquid level in the irregular sealed space combines the fuel volume data, the construction machinery position data and status data uploaded by the vehicle-mounted positioning terminal, and the power supply status data of the vehicle-mounted positioning terminal and the liquid level recorder with the electronic map fence annotation through the fuel consumption monitoring subsystem and the vehicle positioning and electronic fence subsystem, and displays the current liquid fuel change, working position, working status and the power supply status of the monitoring equipment to the construction machinery management department in hours. Push a suspicious fuel change prompt by combining the liquid fuel change data and the working status data; push a prompt of whether it exceeds the working area by combining the current position data and the electronic fence data.

[0055] The present invention combines Internet of Things technology, GPS positioning technology, pressure sensing technology, Bluetooth controllable programming technology, 2G / 4G / 5G mobile communication technology, and Internet of Things technology. A pressure sensor is installed at the inner bottom of the fuel tank of construction machinery, and in combination with controllable Bluetooth communication technology, 2G / 4G / 5G mobile communication technology, GPS positioning technology, and Internet of Things technology, it monitors the changes in liquid pressure, temperature, and tilt angle in an enclosed irregular space and transmits them to the vehicle-mounted positioning terminal. The vehicle-mounted positioning terminal calculates the longitude and latitude, acceleration, angular velocity, amplitude, etc. of the current construction machinery collected by the positioning module through the calculation of volume and state data, and then transmits them to the monitoring platform to complete the secondary multiplexing and superposition of data, so as to judge whether the linear change value of the liquid volume in the enclosed irregular space is normal and whether there is a deviation in the matching with normal operation consumption or normal movement consumption.

Claims

1. A mobile machinery fuel online monitoring system, characterized in that: It includes a liquid level monitor, a vehicle-mounted positioning terminal and an irregular confined space liquid level online monitoring platform connected in sequence; The liquid level monitor comprises a liquid level sensor arranged in the irregular sealed oil tank for monitoring the oil pressure, temperature and tilt angle, and a liquid level meter recorder arranged at the top of the irregular sealed oil tank and connected to the liquid level sensor by wire; the liquid level meter recorder comprises a liquid level microprocessor connected to the liquid level sensor by wire, and the liquid level microprocessor is networked with the vehicle-mounted positioning terminal through a built-in liquid level Bluetooth module and an external polarized antenna; The vehicle-mounted positioning terminal includes an Internet of Things module, an on-board Bluetooth module, an FPC antenna, a GPS+Beidou+LBS positioning module for collecting the longitude and latitude of the construction machinery to obtain the current position, a parameter sensor for collecting parameters of the construction machinery, and a vehicle-mounted microprocessor connected to the GPS+Beidou+LBS positioning module, the parameter sensor, the Internet of Things module, the on-board Bluetooth module and the FPC antenna respectively; the on-board microprocessor is connected to the liquid level meter recorder through the on-board Bluetooth module and the FPC antenna to receive the pressure, temperature and tilt angle data monitored by the liquid level meter recorder and calculate the oil volume in the irregular closed oil tank according to the pressure, temperature and tilt angle data to realize the oil level measurement; the on-board microprocessor obtains the current position according to the data monitored by the GPS+Beidou+LBS positioning module and the parameter sensor and calculates whether the current state of the construction machinery is entering the site, driving normally or exiting the site; the on-board microprocessor is connected to the irregular closed space liquid level online monitoring platform through the Internet of Things module.

2. The mobile machinery fuel online monitoring system according to claim 1, characterized in that: The liquid level sensor and the liquid level meter recorder both adopt nylon shells, and a lithium battery module for powering the liquid level sensor and the liquid level meter recorder is arranged inside the nylon shell of the liquid level meter recorder; the liquid level sensor includes a pressure sensor for monitoring pressure, a temperature sensor for monitoring temperature, and an inclination sensor for monitoring the tilt angle.

3. The mobile machinery fuel online monitoring system according to claim 1, characterized in that: The parameter sensor includes but is not limited to an acceleration sensor for collecting the acceleration of the engineering machinery, an angular velocity sensor for collecting the angular velocity of the engineering machinery, and an amplitude sensor for collecting the amplitude of the engineering machinery.

4. The mobile machinery fuel online monitoring system according to claim 1, characterized in that: The vehicle-mounted positioning terminal adopts a modified ASA material shell and is installed under the visible window of the operating room of the engineering machinery or on the upper side of the operating room ceiling. The vehicle-mounted positioning terminal also includes a battery module. The vehicle-mounted positioning terminal is provided with a photovoltaic component connected to the battery module for realizing solar charging.

5. The mobile machinery fuel online monitoring system according to claim 1, characterized in that: The irregular enclosed space liquid level online monitoring platform includes a fuel energy consumption monitoring subsystem for realizing engineering machinery monitoring, refueling quantity report service, fuel consumption report, refueling quantity comparison, work list, early warning information management, basic information configuration service, refueling quantity import, authority configuration and large-screen display, as well as a vehicle positioning and electronic fence subsystem for realizing electronic tags, electronic fences, real-time positioning of engineering machinery, engineering machinery trajectory tracking, engineering machinery position alarm and data storage.

6. A method for online monitoring of fuel oil in mobile machinery, characterized in that: The following steps are involved: S1. Collect oil pressure, temperature and tilt angle data, and collect latitude and longitude, acceleration data, angular velocity and amplitude data of the construction machinery; S2. Substitute the oil pressure, temperature and tilt angle data into the Boyle-Martin law formula in the form of parameters, convert the pressure value into the volume "liter" value to achieve oil level measurement; at the same time, obtain the current position of the construction machinery according to the longitude and latitude, and calculate the current state of the construction machinery, whether it is entering the site, driving normally or exiting the site, with the support of acceleration data, angular velocity and amplitude data; S3. Combine the oil volume data and the construction machinery location data and status data in step S2 with the electronic map fence markings, and display the current engineering machinery's liquid oil changes, working position and working status to the construction machinery management department on an hourly basis. Combine the liquid oil change data with the working status data to push prompts for suspicious oil changes, and combine the current location data with the electronic fence data to push prompts for whether the work area is exceeded.

7. A method for online monitoring of fuel oil in mobile machinery according to claim 6, characterized in that: The formula of the Boyle-Mars law in step S2 is PV=K, where P is the liquid pressure value; V is the liquid volume value; the difference in the K value under different temperature conditions is experimentally measured, and the least squares method, BP neural network method and regression method are combined to correct the influence of temperature on the measurement results; different pressures under a certain volume at different angles are obtained by experimental measurement, and linear fitting is performed through the least squares method to calculate the measurement error caused by the tilt, and corresponding data correction is performed.

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