CN111521232A - On-line oil quantity measuring system and method for oil tank of diesel heavy truck - Google Patents
On-line oil quantity measuring system and method for oil tank of diesel heavy truck Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 238000012545 processing Methods 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 230000003068 static effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000002828 fuel tank Substances 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 10
- 238000005070 sampling Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000012935 Averaging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention relates to an on-line oil quantity measuring system and method for an oil tank of a diesel heavy truck. The device comprises an oil tank, a liquid level sensor, a signal conversion module, a data processing module, a data transmission module and a monitoring platform, wherein the liquid level sensor is arranged at the bottom of the oil tank and is sequentially connected with the signal conversion module, the data processing module, the data transmission module and the monitoring platform; and a random memory of the data processing module is provided with a liquid level data buffer area, data in the data buffer area are subjected to weighted filtering, and the liquid level is calculated by using the data in the liquid level data buffer area obtained after filtering. The oil quantity can be monitored in real time, the information of the oil quantity is not easily affected by vehicle jolt, and the oil quantity information is more accurate.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring equipment, and particularly relates to an on-line oil quantity measuring system and method for an oil tank of a diesel heavy truck.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The diesel heavy truck is an important transportation capacity in the transportation industry of China, and is particularly important in places with large short-distance transportation volume such as wharfs, ports and the like and in regions where railway transportation is not achieved. The oil tank of the diesel heavy truck is generally large in volume and high in oil storage capacity, the accidental oil loss can occur in the driving process or the suspension process, and once diesel oil is lost, the loss is heavy.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide an on-line oil quantity measuring system and method for a diesel heavy truck oil tank.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an on-line oil quantity measuring system of a diesel heavy truck oil tank comprises the heavy truck oil tank, a liquid level sensor, a signal conversion module, a data processing module, a data transmission module and a monitoring platform, wherein the liquid level sensor is arranged at the bottom of the oil tank and is sequentially connected with the signal conversion module, the data processing module, the data transmission module and the monitoring platform;
the random access memory of the data processing module is provided with a liquid level data buffer area, and the liquid level is calculated by using the data in the liquid level data buffer area.
The invention provides a system for measuring the oil quantity of an oil tank of a diesel heavy truck, which can monitor the oil quantity in real time, and the oil quantity information is not easily influenced by vehicle jolt and is more accurate.
As some embodiments of the invention, the online measurement system comprises a display module, a real-time clock module and an alarm device, wherein the data processing module is respectively connected with the display module, the real-time clock module and the alarm device. The display module can be arranged in the vehicle, so that the oil quantity of the oil tank can be conveniently observed.
As some embodiments of the present invention, the liquid level sensor is a static pressure drop-in type liquid level sensor, and the liquid level sensor includes two static pressure drop-in type liquid level sensors for redundancy processing, and the two static pressure drop-in type liquid level sensors are respectively connected to the signal conversion module.
As some embodiments of the present invention, the signal conversion module includes a current-voltage conversion circuit, a first-order RC filter circuit, a clipping circuit, and a 10-bit ADC circuit; the current-voltage conversion circuit, the first-order RC filter circuit and the amplitude limiting circuit are sequentially connected with the 10-bit ADC circuit.
As some embodiments of the invention, the data processing module is connected with the data transmission module through UART, and the data processing module is connected with the display module through DO-D8.
As some embodiments of the present invention, the data transmission module is a GPRS wireless data transmission mode.
As some embodiments of the invention, the data processing module comprises a central processing unit (MCU) and a memory, the MCU is connected with the memory (EEPROM), and the memory adopts a mode of cascading 3 EEPROMs.
The on-line measuring method using the on-line measuring system comprises the following specific steps:
the liquid level sensor transmits a current signal to the signal conversion module, and the signal conversion module converts the current signal into a voltage signal;
the signal conversion module converts the current signal into a digital signal after filtering and amplitude limiting processing, and inputs the digital signal into the data processing module;
the real-time clock module transmits the time signal to the data processing module, and the data processing module stores the obtained oil mass signal in a memory in combination with the time information;
the data processing module calculates the liquid level by adopting a weighted average filtering method, and then calculates the existing oil quantity according to the specification of the oil tank and the parameter information calibrated by the parameters;
the data processing module transmits the oil quantity signal to the display module and the data transmission module respectively, and the data transmission module transmits the signal to the monitoring platform.
As some embodiments of the present invention, the method of weighted average filtering in the data processing module is: and a liquid level data buffer area is arranged in the RAM, liquid level information is collected at a set frequency, the newly collected liquid level information only updates one part of the buffer, and the updated data in the buffer area is used as an average value to calculate the liquid level. In this way, the latest liquid level data only occupies a part of the average calculation, increasing the robustness and immunity to disturbances of the liquid level values. As long as the depth of the buffer zone is enough, the data in the buffer zone can reflect the change condition of the liquid level in the mailbox within a certain time, and the liquid level fluctuation caused by bumping can be removed through average value calculation. The buffer zone depth, the sampling frequency and the proportion of the latest sampling value in the average value calculation can be set through parameters, and if necessary, the parameters can be calibrated through GPRS.
As some embodiments of the present invention, the method for calculating the oil amount is: and calculating to obtain the volume of the oil tank according to the specification of the oil tank, and then combining the liquid level information to obtain the oil quantity information.
The invention has the beneficial effects that:
the invention discloses an on-line oil quantity measuring device of an oil tank, which can monitor oil quantity data of the oil tank in real time no matter in the driving process or the parking process, and regularly sends the data to a monitoring background through GPRS (general packet radio service), an alarm signal can be sent out when the oil quantity suddenly drops, and the alarm model can control a high-power buzzer to give an alarm and timely upload the data to the background.
Compared with the existing oil mass online acquisition system, the system improves the accuracy of signal acquisition and eliminates the problem of signal fluctuation in the running process of the vehicle.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an on-line measurement system according to embodiment 1 of the present invention;
fig. 2 is an overall configuration diagram of an on-line measuring system of embodiment 1 of the present invention;
FIG. 3 is a schematic view of a fuel tank provided with a liquid level sensor according to embodiment 1 of the invention;
FIG. 4 is a power supply circuit diagram of an online measurement system according to embodiment 1 of the present invention;
fig. 5 is a circuit diagram of a GPRS wireless data transmission module of the on-line measurement system according to embodiment 1 of the present invention;
fig. 6 is a circuit diagram of a power supply portion of a GPRS wireless data transmission module of the on-line measurement system of embodiment 1 of the present invention;
fig. 7 is a diagram of a first-order RC filter circuit and a limiting circuit of the on-line measuring system according to embodiment 1 of the present invention;
fig. 8 is a circuit diagram of a 10-bit ADC of the on-line measurement system according to embodiment 1 of the present invention;
fig. 9 is a circuit diagram of a real-time clock module of an online measurement system according to embodiment 1 of the present invention;
FIG. 10 is an EEPROM memory circuit diagram of the on-line measuring system of embodiment 1 of the invention;
fig. 11 is an interface circuit of a liquid crystal display module of the on-line measuring system according to embodiment 1 of the present invention;
fig. 12 is a circuit diagram of a GPRS module of an on-line measurement system according to embodiment 1 of the present invention;
fig. 13 is a reset circuit diagram of an online measurement system according to embodiment 1 of the present invention;
FIG. 14 is a circuit diagram of an MCU according to embodiment 1 of the present invention;
FIG. 15 is a flowchart of an on-line measuring method according to embodiment 1 of the present invention;
FIG. 16 is a flowchart of a data processing module of embodiment 1 of the present invention;
fig. 17 is a signal transmission diagram of an on-line measuring method according to embodiment 2 of the present invention;
the device comprises an oil tank 1, an oil tank 2, a signal conversion module 3, a data processing module 4, an alarm device 5, a real-time clock module 6, a data transmission module 7, a display module 8, a monitoring module 9, a liquid level sensor 10, a first-order RC filter circuit and an amplitude limiting circuit 11, a 10-bit ADC circuit 12, an MCU 13, an EEPROM 14 and a reset circuit.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. Example 1 the invention will now be further illustrated by reference to the following example
As shown in fig. 1, 2 and 17, in the system for measuring the fuel quantity of the fuel tank of the diesel heavy truck on line, two liquid level sensors 9 are arranged in the fuel tank 1, the two liquid level sensors 9 are sequentially connected with a signal conversion module 2, a data processing module 3, a data transmission module 6 and a monitoring platform 8, and the data processing module 3 is respectively connected with a display module 7, a real-time clock module 5 and an alarm device 4;
the random access memory of the data processing module 3 is provided with a liquid level data buffer area, and the liquid level is calculated by using the data of the liquid level data buffer area.
The real-time clock module generates date and time, and the data processing module 3 records, stores or displays the oil quantity at a time point by combining the time information and the oil quantity information.
The liquid level sensor 9 is a static pressure input type liquid level sensor and comprises two static pressure input type liquid level sensors, and the two static pressure input type liquid level sensors are respectively connected with the signal conversion module 2.
The signal conversion module 2 adopts a current-voltage conversion circuit, a first-order RC filter circuit and an amplitude limiting circuit 10 and a 10-bit ADC circuit 11, and the first-order RC filter circuit and the amplitude limiting circuit 10 are connected with the 10-bit ADC circuit 11.
The data processing module 3 is connected with the data transmission module 8 through UART, and the data processing module 3 is connected with the display module 7 through DO-D8. The display module 7 is a liquid crystal display module.
The data transmission module 8 is a GPRS wireless data transmission module.
The data processing module 3 comprises a central processing unit (MCU)12 and a memory EEPROM 13, and the MCU 12 is connected with the EEPROM 13. The MCU 12 is connected to a reset circuit 14.
Example 2
As shown in fig. 15, 16 and 17, the online oil quantity measuring method comprises the following processes:
the liquid level sensor 9 transmits the current signal to the signal conversion module 2, and the signal conversion module 2 converts the current signal into a voltage signal;
the signal conversion module 2 converts the voltage signal into a digital signal and inputs the digital signal into the data processing module 3;
the real-time clock module 5 transmits the signal to the data processing module 3, and the data processing module 3 stores the obtained oil quantity signal into the memory 13;
the data processing module 3 calculates the liquid level by adopting a weighted average filtering method, and then calculates the existing oil quantity according to the specification of the oil tank and the oil quantity information displayed by the display module;
the data processing module transmits the oil quantity signal to the display module 7 and the data transmission module 6 respectively, and the data transmission module 6 transmits the signal to the monitoring platform 8.
The oil tank liquid level sensor adopts a design mode of 2 liquid level sensors for redundancy, a liquid level sensor 9 outputs 4-20 mA current signals, the signals are input into a signal conversion and filtering circuit of an oil quantity online measuring system of a diesel vehicle oil tank, the current signals are converted into voltage signals through the conversion circuit, and the voltage signals are input into a 10-bit ADC 11 through a first-order RC filtering circuit and an amplitude limiting circuit 10; the ADC converts the input analog voltage signal into a digital signal and inputs the digital signal into the MCU 12; the MCU 12 converts the received digital signals into liquid level and oil mass signals of a diesel vehicle oil tank through software conversion, then combines the time points of a calendar clock, stores the liquid level and oil mass signals into the EEPROM 13, displays the liquid level and oil mass signals to the display module 7, and sends oil mass information to the GPRS wireless data transmission module through a UART port after a certain time interval (for example, 5 minutes) is reached; the GPRS wireless data transmission module sends the oil quantity information of the diesel vehicle to a monitoring background (PC) through a mobile network, and the PC monitors information such as historical data of the oil quantity of an oil tank of the diesel vehicle; in addition, the monitoring background can also adopt a software plug-in to calibrate the diesel vehicle oil tank oil quantity online measuring device through a GPRS wireless data transmission module, for example, the diesel vehicle oil tank is filled with the oil quantity, the diesel vehicle number and the like; the reset circuit can ensure that the MCU works normally, and the power supply part can ensure that the whole device works normally.
As shown in fig. 16, a liquid level data buffer is opened in the RAM, liquid level information is collected at a set frequency, only a part of the buffer is updated with the latest collected liquid level information, and the liquid level is calculated by averaging the data in the buffer after the update. The time interval for collecting the liquid level data may be 0.5 s.
Because the diesel vehicle has vehicle jolt in the form process, the output signal of a liquid level sensor in an oil tank is output along with fluctuation, the fluctuation frequency is not fixed, and if the liquid level data obtained by sampling is directly used for calculating the oil quantity in the oil tank, the oil quantity data can fluctuate violently;
the latest liquid level data only occupies a part of the average value calculation, and the robustness and the interference resistance of the liquid level value are improved. As long as the depth of the buffer zone is enough, the data in the buffer zone can reflect the change condition of the liquid level in the mailbox within a certain time, and the liquid level fluctuation caused by bumping can be removed through average value calculation. The buffer zone depth, the sampling frequency and the proportion of the latest sampling value in the average value calculation can be set through parameters, and if necessary, the parameters can be calibrated through GPRS.
As shown in fig. 3, the method for calculating the fuel amount of the fuel tank includes:
the volume and the shape of the oil tank of the diesel vehicle of the fixed vehicle type are also fixed, and the oil tank is generally cuboid or special-shaped. If the length, width and height data of the tank are given (these data can be calibrated by GPRS) or the profile body is divided into several regular geometric bodies, the volume of the geometric body of the oil tank can be calculated, and the oil filling of the oil tank can be calculated. And then the existing oil quantity in the oil tank can be calculated by combining the liquid level information output by the liquid level sensor.
The following examples of circuits in an on-line measurement system:
the power supply circuit is shown in fig. 4:
the diesel vehicle oil tank oil mass on-line measuring device supplies power by adopting a vehicle-mounted 24V lead-acid battery, and the power supply voltage is 18V-28V. After the vehicle-mounted 24V lead-acid battery is connected to the online measuring device, the vehicle-mounted 24V lead-acid battery passes through the short-circuit protection self-recovery fuse and the anti-reverse diode, is input to the common mode suppressor L2, is converted into 24V through the 220uF and 0.1uF filter capacitor, and is input to the lower circuit. And after the 24V subjected to short circuit prevention, reverse connection prevention, common mode filtering and capacitance filtering is subjected to resistance voltage division, the voltage is input into the MCU, and the MCU detects the condition of the power supply voltage.
The 24V power supply is converted into VCC direct current voltage with the capacity of 0.5A and the output voltage of 5V through a switching power supply circuit, and provides power for circuits of each part of the measuring device.
The GPRS circuit is shown in fig. 5: the GPRS module supplies power for +3.3V, so that a power supply which is changed from 5V to 3.3.V is needed, the realization is realized by adopting LDO, LM1117-3.3, and the designed power supply capacity is 0.5A.
The first-order RC filter circuit and the amplitude limiting circuit are shown in FIG. 6; the signal conversion and filtering circuit plays a role in signal conversion and filtering. The liquid level sensor outputs 4-20 mA current signals, after the current signals are input into the detection device, the current signals are converted into 0.5V-2.5V voltage signals through a diode D29 and a sampling resistor R46, and after the voltage signals are filtered through a first-order RC filter circuit composed of R22, C29 and C58, the voltage signals are input into a 10-bit ADC through an amplitude limiting circuit composed of D58 and D66.
The 10-bit ADC circuit is shown in fig. 7: the 10-bit ADC is a successive approximation type ADC, the model is TLC1543IN, the chip has 8-path input, and 2-path input is used due to the adoption of a dual-sensor redundancy design, so that external access to a reference voltage is required. The reference voltage is designed by a 2.5V voltage-regulator tube.
The time input circuit is a calendar clock circuit, as shown in fig. 8: the calendar clock is designed by DS1302 of Dallas, and 3.6V button cell is used for power supply.
The EEPROM memory circuit is shown in fig. 9: the EEPROM storage circuit adopts a mode of cascading 3 EEPROMs.
The display module is a liquid crystal display module, the liquid crystal display screen adopts an LCD display screen, the interface adopts a parallel port connection mode, and the circuit connection is as shown in figure 10.
The GPRS data transmission circuit diagram is shown in fig. 11: the GPRS module adopts a USR-GM3 module of the Internet of things. The module needs to be connected with the SIM card holder and the radio frequency antenna, communicates with the MCU through a UART interface, and needs to be connected with signals such as reset, awaken and connection notification.
The reset circuit adopts an externally-expanded reset chip to ensure that the MCU is correctly reset. The reset chip is implemented with a chip ASM 813.
MCU circuit As shown in FIG. 12, the MCU is implemented using STC89C 54.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a diesel oil heavy truck oil tank oil mass on-line measuring system which characterized in that: the device comprises an oil tank, a liquid level sensor, a signal conversion module, a data processing module, a data transmission module and a monitoring module, wherein the liquid level sensor is arranged at the bottom of the oil tank and is sequentially connected with the signal conversion module, the data processing module, the data transmission module and a monitoring platform;
the random access memory of the data processing module is provided with a liquid level data buffer area, and the liquid level is calculated by using the data in the liquid level data buffer area.
2. The on-line oil quantity measuring system of the oil tank of the diesel heavy truck as recited in claim 1, characterized in that: the on-line measuring system comprises a display module, a real-time clock module and an alarm device, wherein the data processing module is respectively connected with the display module, the real-time clock module and the alarm device.
3. The on-line oil quantity measuring system of the oil tank of the diesel heavy truck as recited in claim 1, characterized in that: the liquid level sensor is a static pressure input type liquid level sensor and comprises two static pressure input type liquid level sensors, and the two static pressure input type liquid level sensors are respectively connected with the signal conversion module.
4. The on-line oil quantity measuring system of the oil tank of the diesel heavy truck as recited in claim 1, characterized in that: the signal conversion module adopts a current-voltage conversion circuit, a first-order RC filter circuit, an amplitude limiting circuit and a 10-bit ADC circuit, and the current-voltage conversion circuit, the first-order RC filter circuit and the amplitude limiting circuit are sequentially connected with the 10-bit ADC circuit.
5. The on-line measuring system for the fuel quantity of the fuel tank of the diesel heavy truck as set forth in claim 1, characterized in that: the data processing module is connected with the data transmission module through a UART, and the data processing module is connected with the display module through DO-D8.
6. The on-line oil quantity measuring system of the oil tank of the diesel heavy truck as recited in claim 1, characterized in that: the data transmission module is a GPRS wireless data transmission module.
7. The on-line oil quantity measuring system of the oil tank of the diesel heavy truck as recited in claim 1, characterized in that: the data processing module is a central processing unit and a memory, the central processing unit is connected with the memory, and the memory adopts a mode of cascading 3 EEPROMs.
8. The on-line measuring method of the oil mass on-line measuring system of the oil tank of the diesel heavy truck as set forth in any one of claims 1 to 7, characterized in that: the method comprises the following specific steps:
the liquid level sensor transmits a current signal to the signal conversion module, and the signal conversion module converts the current signal into a voltage signal;
the signal conversion module converts the current signal into a digital signal after filtering and amplitude limiting processing, and inputs the digital signal into the data processing module;
the real-time clock module transmits the time signal to the data processing module, and the data processing module stores the obtained oil mass signal in a memory in combination with the time information;
the data processing module calculates the liquid level by adopting a weighted average filtering method, and then calculates the existing oil quantity according to the specification of the oil tank and the parameter information calibrated by the parameters;
the data processing module transmits the oil quantity signal to the display module and the data transmission module respectively, and the data transmission module transmits the signal to the monitoring platform.
9. The on-line measuring method of the oil mass on-line measuring system of the oil tank of the diesel heavy truck as claimed in claim 8, characterized in that: the method for weighted average filtering in the data processing module comprises the following steps: and a liquid level data buffer area is arranged in the RAM, liquid level information is collected at a set frequency, the newly collected liquid level information only updates one part of the buffer, and the updated data in the buffer area is used as an average value to calculate the liquid level.
10. The on-line measuring method of the oil mass on-line measuring system of the oil tank of the diesel heavy truck as claimed in claim 8, characterized in that: the oil quantity calculation method comprises the following steps: and calculating to obtain the volume of the oil tank according to the specification of the oil tank, and then combining the liquid level information to obtain the oil quantity information.
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| CN114526786A (en) * | 2022-02-14 | 2022-05-24 | 贵州电网有限责任公司 | Wireless water level sensor system and method based on anti-interference signal processing |
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Application publication date: 20200811 |