Automobile oil tank truck capacity measurement and control system and measurement and control method based on flow meter self-checking

Abstract

The invention discloses an automobile oil tank truck capacity measurement and control system and method based on flowmeter self-checking, and belongs to the technical field of automobile oil tank truck capacity measurement and control. The system comprises a warehouse capacity calibration measurement and control subsystem, a flowmeter self-checking measurement and control subsystem and a control module, wherein the warehouse capacity calibration measurement and control subsystem is used for completing the calibration work of the target warehouse capacity on the automobile oil tank truck; the flowmeter self-checking measurement and control subsystem is used for completing the self-checking work without dismounting the flowmeter; the warehouse capacity calibration measurement and control subsystem and the flowmeter self-checking measurement and control subsystem are both connected with the control module, and the control module receives measurement signals of all components in the warehouse capacity calibration measurement and control subsystem and the flowmeter self-checking measurement and control subsystem and sends out control signals to complete the measurement and control process of the system. The device is clear in principle, simple in structure and easy to popularize and use in the industry.

Description

Technical Field

[0001] The invention relates to the technical field of capacity measurement and control of automobile oil tanker trucks, and more particularly to a capacity measurement and control system and method of automobile oil tanker trucks based on flow meter self-calibration. Background Art

[0002] Tank trucks are special vehicles for transporting liquid light petroleum and chemical products. They consist of one or several warehouses. The capacity of each warehouse can be calibrated and used as a measuring instrument for trade settlement or internal handover.

[0003] The calibration of oil tank trucks is generally carried out in accordance with the national metrological verification regulations JJG 133 "Capacity of oil tank trucks". The calibration methods in the regulations include the capacity comparison method and the flow meter method. The capacity comparison method device uses a second-class standard metal measuring instrument as a standard device to compare the capacity of each tank of the oil tank truck; while the flow meter method device uses an expanded uncertainty U Not more than 0.08% ( k =2) is used as the standard instrument, and the capacity of the tanker truck is determined by measuring the accumulated flow of the flow meter. The capacity comparison method is more accurate, but the calibration requires intermittent processes such as adding water, draining, and stabilization, so the calibration efficiency is not high; the flow meter method can be calibrated continuously, and the calibration efficiency is higher, but the accuracy of the flow meter is unknown during the calibration process, and the reliability of the calibration is questionable. In order to know the accuracy of the flow meter, it is necessary to remove it from the device in time and send it to the laboratory for calibration, and then install it back on the device, which is time-consuming and labor-intensive, and is also affected by factors such as the transportation process and installation. In fact, it is impossible to achieve the purpose of timely knowing the accuracy of the flow meter. In addition, whether it is the capacity comparison method device or the flow meter method device, most of them are manually operated, with low work efficiency and prone to errors.

[0004] Therefore, how to provide a vehicle tanker capacity measurement and control system and method based on flow meter self-calibration that can solve the above-mentioned problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a vehicle tanker capacity measurement and control system and method based on flow meter self-calibration, and establishes a complete measurement and control system to achieve the goals of automated vehicle tanker capacity calibration, normalized flow meter accuracy monitoring, and precise calibration process control.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A capacity measurement and control system for automobile oil tankers based on flow meter self-calibration, comprising: a tank capacity calibration measurement and control subsystem, a flow meter self-calibration measurement and control subsystem and a control module; Among them, the warehouse capacity calibration and measurement and control subsystem is used to complete the calibration of the target warehouse capacity on the tanker truck; the flow meter self-calibration measurement and control subsystem is used to complete the self-calibration of the flow meter without disassembly; the warehouse capacity calibration and measurement and control subsystem and the flow meter self-calibration measurement and control subsystem are both connected to the control module, and the control module receives the measurement signals of each component in the warehouse capacity calibration and measurement and control subsystem and the flow meter self-calibration measurement and control subsystem, and sends out control signals to complete the system measurement and control process.

[0007] Preferably, the storage capacity calibration and measurement and control subsystem includes: External water tank, water pump, deaerator, flow meter, large flow regulating valve, small flow regulating valve, first diverter nozzle, first working pipeline, first bypass, filling pipe, liquid level gauge, first thermometer, second thermometer; in, The external water tank is used to provide a circulating water source and receive a water source; The front end and rear end of the water pump are respectively equipped with a stop valve A and a stop valve B, which are used to discharge the water in the external water tank into the pipeline; The degasser is used to eliminate bubbles contained in the water in the pipeline; The flow meter serves as a calibration standard to provide a standard value for the accumulated flow rate; The large flow regulating valve and the small flow regulating valve are used for large and small flow regulation respectively; The first diverter nozzle is used to direct the water flow into the first working pipeline or the first bypass respectively; The filling pipe is used to connect different target tanks when the tanker truck does not move; The liquid level meter is used to measure the liquid level value in the target bin; The first thermometer and the second thermometer are used to measure the water temperature in the target bin and at the flow meter, respectively.

[0008] Preferably, the first diverter nozzle is provided with a first input end, a first output end and a second output end, the first input end is connected to the large flow regulating valve and the small flow regulating valve, the first output end is connected to the inlet of the first working pipeline, and the second output end is connected to the inlet of the first bypass; the outlet of the first working pipeline is connected to the filling pipe inlet through a locking valve, and the filling pipe outlet is connected to the target bin, so that the filling pipe can be connected to different target bins without moving the tank truck.

[0009] Preferably, the flow meter self-calibration measurement and control subsystem includes: a second commutator nozzle, a second working pipeline, a second bypass, an electronic scale and an electronic scale container, and a third thermometer; in, The second diverter nozzle is provided with a second input end, a third output end and a fourth output end, the second input end is connected to the outlet of the first bypass through a stop valve, the third output end is connected to the inlet of the second working pipeline, and the fourth output end is connected to the inlet of the second bypass; the second diverter nozzle is used to guide the water flow at the inlet of the second input end into the second working pipeline or the second bypass respectively; The outlet of the second working pipeline is connected to the electronic scale container, and an electronic scale is placed at the bottom of the electronic scale container; The second bypass is connected to the external water tank; After use, the water in the electronic scale container and the target bin is discharged to the external water pool through stop valve G and stop valve H respectively; The third thermometer is used to measure the water temperature in the electronic scale.

[0010] A method for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration is applied to the above-mentioned system for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration, and comprises the following steps: S1: Set the minimum value of the warehouse capacity calibration time t min , the flow meter is at the flow point q The indication error is , enter the warehouse capacity calibration measurement and control subsystem, and perform the first n calibration operation, the warehouse capacity calibration time is ; S2: Enter the flow meter self-calibration measurement and control subsystem, and check the flow point q Perform the indication error check operation, take the average value of the two check results, and obtain the target bin capacity for the first n After the calibration, that is, n +1 flow point before calibration q The indication error ; S3: Set flag value BZ n , BZ n =| δ n+1 / δ n |, according to the flag value BZ n The calculation result determines the next operation behavior.

[0011] Preferably, the S1 comprises: S11: In flow q Under the condition of n calibration operation, the warehouse capacity calibration time is , the accumulated water capacity of the flow meter tank during the calibration time is ; S12: Flow meter accumulated water capacity After flow correction, , which is the target warehouse n A calibration result.

[0012] Preferably, S3 includes: S31: If: BZ n Less than or equal to 1, then the previous After correction, ; Next warehouse capacity calibration time t n+1 With the previous t n Same; if two consecutive BZ n If the value does not exceed 1, then n +1 warehouse capacity calibration time t n+1 Restore t 1; S32: If: BZ n If it is greater than 1 and less than or equal to 2, then the previous After correction, ; Next warehouse capacity calibration time t n+1 For the previous t n 0.8 times of the original value, shortening the warehouse capacity calibration time and increasing the number of flow meter self-calibration; S33: If: BZ n Greater than 2 or t n+1 Less than t min , then suspend the calibration, find the cause, and continue after solving the problem.

[0013] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a capacity measurement and control system and a measurement and control method for an automobile tanker based on flow meter self-calibration, and the beneficial effects are as follows: (1) The measurement and control system of the present invention can complete the warehouse capacity calibration work and the flow meter self-calibration work respectively through the warehouse capacity calibration measurement and control subsystem and the flow meter self-calibration measurement and control subsystem, that is, the warehouse capacity calibration is realized, and the flow meter is verified without disassembly, which saves working time.

[0014] (2) The measurement and control method of the present invention can determine the next operation based on the comparison result of the indication error after two consecutive calibrations of the same flow point; when the absolute value (i.e., the mark value) of the ratio of the indication error of the current flow point to the previous calibration indication error is less than or equal to 1, it indicates that the accuracy of the flow meter is relatively stable, and the previous bin capacity calibration result should be corrected in time; when the mark value is greater than 1 and less than or equal to 2, it indicates that the accuracy of the flow meter tends to deteriorate, and the previous bin capacity calibration result should be corrected first, and then the next bin capacity calibration time should be shortened by 0.8 times, and the number of flow meter self-calibration should be increased; when two consecutive mark values ​​are less than or equal to 1, it indicates that the accuracy of the flow meter tends to be stable again. If the bin capacity calibration time has been shortened, the next bin capacity calibration time can be restored to the first calibration time; when the mark value is greater than 2 or the next bin capacity calibration time is less than the minimum bin capacity calibration time, it indicates that the accuracy of the flow meter is constantly deteriorating and unstable, and the calibration should be suspended, the cause should be found in time, and the problem should be solved before continuing. This measurement and control method ensures the reliability of the flow meter's metering status and the accuracy of the warehouse capacity calibration.

[0015] In summary, the present invention provides a capacity measurement and control system and method for automobile tanker trucks based on flow meter self-calibration, which have clear principles, simple structures, and are easy to promote and use in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the measurement and control system of the present invention; Figure 2 It is a schematic diagram of the measurement and control method flow of the present invention.

[0018] Figure 1Among them, 1-tank truck, 2-target warehouse, 3-external water pool, 4-electronic scale container, 5-electronic scale, 6-water pump, 7-degassing device, 8-flow meter, 9-large flow regulating valve, 10-small flow regulating valve, 11-first diverter nozzle, 12-first bypass, 13-first working pipeline, 14-locking valve, 15-filling pipe, 16-second diverter nozzle, 17-second bypass, 18-second working pipeline, 19-liquid level meter, 20-first thermometer, 21-second thermometer, 22-stop valve A, 23-stop valve B, 24-stop valve C, 25-stop valve D, 26-stop valve E, 27-stop valve F, 28-stop valve G, 29-stop valve H, 30-third thermometer, 31-control module. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide a capacity measurement and control system and method for a tanker truck based on flow meter self-calibration, the system comprising: a storage capacity calibration measurement and control subsystem, a flow meter self-calibration measurement and control subsystem and a control module; wherein the storage capacity calibration measurement and control subsystem is used to complete the calibration of the target storage capacity of the tanker truck; the flow meter self-calibration measurement and control subsystem uses the electronic scale provided by the system to complete the flow meter calibration (i.e. self-calibration) without disassembly; the storage capacity calibration measurement and control subsystem and the flow meter self-calibration measurement and control subsystem are both connected to the control module, the control module receives the measurement signals of each component in the storage capacity calibration measurement and control subsystem and the flow meter self-calibration measurement and control subsystem, and sends out a control signal to complete the system measurement and control process. The present invention provides a solution for realizing the automation of tanker truck capacity calibration, the normalization of flow meter accuracy monitoring, and the precision of calibration process control.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] Embodiment 1 of the present invention discloses a capacity measurement and control system for automobile oil tankers based on flow meter self-calibration, including: a tank capacity calibration measurement and control subsystem, a flow meter self-calibration measurement and control subsystem, and a control module; Among them, the warehouse capacity calibration measurement and control subsystem is used to complete the calibration of the target warehouse capacity of the tanker truck; the flow meter self-calibration measurement and control subsystem uses the electronic scale that comes with the system to complete the self-calibration of the flow meter without disassembly; the warehouse capacity calibration measurement and control subsystem and the flow meter self-calibration measurement and control subsystem are both connected to the control module, and the control module receives the measurement signals of each component in the warehouse capacity calibration measurement and control subsystem and the flow meter self-calibration measurement and control subsystem, and sends out control signals to complete the system measurement and control process.

[0024] In a specific embodiment, the embodiment of the present invention discloses a capacity measurement and control system for an automobile tanker truck based on flow meter self-calibration, which adopts a flow meter method and is mainly composed of a water pump, an air eliminator, a flow meter, a commutator nozzle, a liquid level meter, a thermometer, an electronic scale, an external water tank, pipelines, valves, a control module, etc.

[0025] Specifically, Figure 1 As shown, the storage capacity calibration measurement and control subsystem includes an external water tank 3, a water pump 6, an air eliminator 7, a flow meter 8, a large flow regulating valve 9, a small flow regulating valve 10, a first diverter nozzle 11, a first working pipeline 13, a first bypass 12, a filling pipe 15, a liquid level meter 19, a first thermometer 20, a second thermometer 21 and corresponding valves, pipelines, etc.; the flow meter self-calibration measurement and control subsystem includes a second diverter nozzle 16, a second working pipeline 18, a second bypass 17, an electronic scale 5 and an electronic scale container 4, a third thermometer 30 and corresponding valves and pipelines, etc.

[0026] More specifically, the flow meter self-calibration measurement and control subsystem also shares the external water tank 3, water pump 6, deaerator 7, flow meter 8, large flow regulating valve 9, small flow regulating valve 10, first diverter nozzle 11, first bypass 12 and second thermometer 21 with the warehouse capacity calibration measurement and control subsystem.

[0027] The external water tank 3 is used to provide a circulating water source and receive water from the target bin 2 and the electronic scale container 4; the water pump 6 is used to discharge the water in the external water tank 3 into the pipeline, the front end of which extends into the interior of the external water tank 3 through the stop valve A22, and the rear end of which is connected to the inlet of the degasser 7 through the stop valve B23; the degasser 7 is used to eliminate bubbles contained in the water in the pipeline, and its outlet is connected to the inlet of the flowmeter 8; the flowmeter 8 is used as a calibration standard to provide a standard value of the flow rate, and a second thermometer 21 is arranged on its outlet pipeline, the lower end of the second thermometer 21 extends into the pipeline, and is used to measure the water temperature at the flowmeter 8; the outlet of the flowmeter 8 is connected to the inlets of the stop valve D25 and the stop valve C24 respectively through a tee; the outlet of the stop valve D25 is connected to the inlet of the large flow regulating valve 9 The outlet of the stop valve C24 is connected to the inlet of the small flow regulating valve 10; the large flow regulating valve 9 and the small flow regulating valve 10 are used for large and small flow regulation respectively; the outlet of the large flow regulating valve 9 is connected to the outlet of the small flow regulating valve 10, and is connected to the first diverter nozzle 11 through a three-way connection; the first diverter nozzle 11 is provided with a first input end, a first output end and a second output end, the first input end is connected to the outlets of the large flow regulating valve 9 and the small flow regulating valve 10, the first output end is connected to the inlet of the working pipeline 13, and the second output end is connected to the inlet of the first bypass 12; the first diverter nozzle 11 is used to introduce the water flow at the inlet of the first input end into the first working pipeline 13 or the first bypass 12 respectively; the outlet of the first working pipeline 13 is connected to the first working pipeline 13 or the first bypass 12 through the locking valve 1 4 is connected to the inlet of the filling pipe 15, and the outlet of the filling pipe 15 is connected to the target tank 2. The filling pipe 15 can be connected to different target tanks and fixed by the locking valve 14 without moving the tank truck; a liquid level meter 19 and a first thermometer 20 are provided at the target tank 2; the lower end of the liquid level meter 19 extends into the target tank 2 to measure the liquid level value in the target tank 2; the lower end of the first thermometer 20 extends into the target tank 2 to measure the water temperature in the target tank 2; the outlet of the first bypass 12 is respectively connected to the inlet of the stop valve E26 and the stop valve F27 through a three-way connection, the outlet of the stop valve E26 is connected to the external water tank 3, and the outlet of the stop valve F27 is connected to the second diverter nozzle 16; the second diverter nozzle 16 is provided with a second input end, a third output end and a fourth output end , the second input end is connected to the outlet of the stop valve F27, the third output end is connected to the inlet of the working pipeline 18, and the fourth output end is connected to the inlet of the second bypass 17; the second commutator nozzle 16 is used to introduce the water flow at the inlet of the second input end into the second working pipeline 18 or the first bypass 17 respectively; the outlet of the second working pipeline 18 is connected to the electronic scale container 4; a third thermometer 30 is provided at the electronic scale container 4; the lower end of the third thermometer 20 extends into the electronic scale container 4, and is used to measure the water temperature in the electronic scale container 4, so as to obtain the corresponding water density value through the water temperature value; the outlet of the second bypass 17 is connected to the external water pool 3; the water in the electronic scale container 4 and the target bin 2 is discharged to the external water pool 3 through the stop valve G28 and the stop valve H29 after use.All major components, valves, etc. of the measurement and control system are connected to the control module 31, which is used to receive measurement signals from various components and send control signals to complete the system measurement and control process.

[0028] In a specific embodiment, the working process is as follows: The tanker truck 1 has been parked, and the equipment and pipelines for the test have been prepared. The first diverter nozzle 11 is placed at the second output end, and the second diverter nozzle 16 is placed at the fourth output end; the filling pipe 15 is connected to the target bin 2 and fixed by the locking valve 14; and all valves are in a closed state.

[0029] 1. Implementation process of warehouse capacity calibration and measurement and control subsystem 1.1 Small flow calibration status Open the stop valve C24 and stop valve E26, then open the stop valve A22, stop valve B23, and water pump 6. The water in the external water pool 3 returns to the external water pool 3 through the stop valve A22, water pump 6, stop valve B23, deaerator 7, flow meter 8, stop valve C24, small flow regulating valve 10, first diverter nozzle 11, first bypass 12, and stop valve E26. Adjust the target small flow value through the small flow regulating valve 10. After the flow stabilizes, switch the first diverter nozzle 11 to the first output end and start the system timing. The first diverter nozzle 11 guides the water flow through the first working pipeline 13, the locking valve 14, and the filling pipe 15 into the target warehouse 2. t B1 After the calibration time, the first commutator nozzle 11 is switched to the second output end, and the accumulated water capacity of the flow meter 8 is obtained through the control module 31 Q L1 , water temperature T L1 , the liquid level height of target bin 2 h M1 , water temperature T M1 , cumulative water capacity Q M1 (After flow correction and temperature correction), the first calibration operation is completed. Switch the first commutator nozzle 11 to the first output end again and start the system timing. t B2 After the calibration time, the first commutator nozzle is switched to the second output end, and the accumulated water capacity of the flow meter 8 is obtained through the control module 31 Q L2 , water temperature T L2 , the liquid level height of target bin 2 h M2 , water temperature T M2 , cumulative water capacity Q M2(After flow correction and temperature correction), complete the second calibration operation... Repeat this process until all calibration operations of the target bin 2 are completed. Open the stop valve H29, drain the water in the target bin 2 to the external pool 3, and then close the stop valve H29. For the calibration of multiple target bins, they can be performed one by one in a certain order.

[0030] 1.2 Large flow calibration status Open the stop valve D25 and the stop valve E26, then open the stop valve A22, the stop valve B23, and the water pump 6. The water in the external water pool 3 passes through the stop valve A22, the water pump 6, the stop valve B23, the deaerator 7, the flow meter 8, the stop valve D25, the large flow regulating valve 9, the first diverter nozzle 11, the first bypass 12, and the stop valve E26 and then returns to the external water pool 3. The specific operation is similar to that of the small flow calibration. The large flow calibration state is suitable for target bins with larger capacity, and the calibration can be completed in less time.

[0031] 2. Implementation process of flow meter self-calibration measurement and control subsystem 2.1 Check the small flow point Open the stop valve C24 and the stop valve F27, then open the stop valve A22, the stop valve B23, and the water pump 6. The water in the external water pool 3 passes through the stop valve A22, the water pump 6, the stop valve B23, the deaerator 7, the flow meter 8, the stop valve C24, the small flow regulating valve 10, the first diverter nozzle 11, the first bypass 12, the stop valve F27, the second diverter nozzle 16, and the second bypass 17 and then returns to the external water pool 3. The target small flow value is adjusted by the small flow regulating valve 10. After the flow stabilizes, the second diverter nozzle 16 is switched to the third output end and the system timing is started. The second diverter nozzle 16 guides the water flow through the second working pipeline 18 into the electronic scale container 4. t X1 After checking the time, switch the second commutator nozzle to the fourth output end, and obtain the cumulative flow of the flow meter 8 through the control module 31 Q L1 , water temperature T L1 , water quality of electronic scale container 4 M D1 , water temperature T D1 , completing the first calibration operation of this flow point. Switch the second commutator nozzle 16 to the third output end again, after t X2 After checking the time, switch the second commutator nozzle to the fourth output end, and obtain the cumulative flow of the flow meter 8 through the control module 31 Q L2 , water temperature T L2 , water quality of electronic scale container 4M D2 , water temperature T D2 , complete the second calibration operation of this flow point, and take the average value of the indication error of the second calibration as the indication error of this flow point. Repeat this operation process until the calibration operation of all small flow points is completed. Open the stop valve G28, drain the water in the electronic scale container 4 to the external water pool 3, and then close the stop valve G28.

[0032] 2.2 Check the high flow point Open the stop valve D25 and the stop valve F27, then open the stop valve A22, the stop valve B23, and the water pump 6, and the water in the external water pool 3 passes through the stop valve A22, the water pump 6, the stop valve B23, the deaerator 7, the flow meter 8, the stop valve D25, the large flow regulating valve 9, the first diverter nozzle 11, the first bypass 12, the stop valve F27, the second diverter nozzle 16, and the second bypass 17 and then returns to the external water pool 3. The specific operation is similar to the method of calibrating the small flow point.

[0033] Example 2

[0034] See also Figure 2 Embodiment 2 of the present invention discloses a method for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration, which is applied to a system for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration in any one of the above embodiments 1, and is used to calibrate the indication error of the flow meter during the tank capacity calibration of the tanker truck, and timely adjust subsequent operation behaviors according to changes in the indication error.

[0035] S1: Set the minimum value of the warehouse capacity calibration time t min , the flow meter is at the flow point q The current indication error is δ n , enter the warehouse capacity calibration measurement and control subsystem, and perform the first n calibration operation, the warehouse capacity calibration time is ; S2: Immediately enter the flow meter self-calibration measurement and control subsystem, and check the flow point q Perform the indication error check operation, take the average value of the two check results, and obtain the target bin capacity for the first n After the calibration, that is, n +1 flow point before calibration q The indication error ; S3: Set flag value BZ n , BZ n =| δ n+1 / δ n |, according to the flag value BZ n The calculation result determines the next operation behavior.

[0036] In a specific embodiment, S1 includes: S11: In flow q Under the condition of n calibration operation, the warehouse capacity calibration time is , the accumulated water capacity of the flow meter tank during the calibration time is ; S12: Flow meter accumulated water capacity After flow correction, , which is the target warehouse n A calibration result.

[0037] In a specific embodiment, S3 includes: S31: If: BZ n Less than or equal to 1, then the previous After correction, ; Next warehouse capacity calibration time t n+1 With the previous t n Same; if two consecutive BZ n If the value does not exceed 1, then n +1 warehouse capacity calibration time t n+1 Restore t 1.

[0038] Specifically, ; ; ; When n>=2, if BZ n <=1 and BZ n-1 <=1, then ; S32: If: BZ n Greater than 1 and less than or equal to 2, then the previous Q n 'Make corrections, and after correction it is Q n "; Next warehouse capacity calibration time t n+1 For the previous t n0.8 times of that, that is, shortening the warehouse capacity calibration time, increasing the number of flow meter self-calibration times, and improving the frequency of flow meter self-calibration.

[0039] Specifically, ; S33: If BZ n Greater than 2 or t n+1 Less than t min , then suspend the calibration, find the cause, and continue after solving the problem.

[0040] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0041] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A capacity measurement and control system for automobile tanker trucks based on flow meter self-calibration, characterized in that: include: Storage capacity calibration measurement and control subsystem, flow meter self-calibration measurement and control subsystem and control module; Among them, the warehouse capacity calibration and measurement and control subsystem is used to complete the calibration of the target warehouse capacity on the tanker truck; the flow meter self-calibration measurement and control subsystem is used to complete the self-calibration of the flow meter without disassembly; the warehouse capacity calibration and measurement and control subsystem and the flow meter self-calibration measurement and control subsystem are both connected to the control module, and the control module receives the measurement signals of each component in the warehouse capacity calibration and measurement and control subsystem and the flow meter self-calibration measurement and control subsystem, and sends out control signals to complete the system measurement and control process.

2. The automobile tanker capacity measurement and control system based on flow meter self-calibration according to claim 1 is characterized in that: The warehouse capacity calibration measurement and control subsystem includes: External water tank, water pump, deaerator, flow meter, large flow regulating valve, small flow regulating valve, first diverter nozzle, first working pipeline, first bypass, filling pipe, liquid level gauge, first thermometer, second thermometer; in, The external water tank is used to provide a circulating water source and receive a water source; The front end and rear end of the water pump are respectively provided with a stop valve A and a stop valve B, which are used to discharge the water in the external water tank into the pipeline; The degasser is used to eliminate bubbles contained in the water in the pipeline; The flow meter serves as a calibration standard to provide a standard value for the accumulated flow rate; The large flow regulating valve and the small flow regulating valve are used for large and small flow regulation respectively; The first diverter nozzle is used to direct the water flow into the first working pipeline or the first bypass respectively; The filling pipe is used to connect different target tanks when the tanker truck does not move; The liquid level meter is used to measure the liquid level value in the target bin; The first thermometer and the second thermometer are used to measure the water temperature in the target bin and at the flow meter, respectively.

3. The automobile tanker capacity measurement and control system based on flow meter self-calibration according to claim 2 is characterized in that: The first diverter nozzle is provided with a first input end, a first output end and a second output end, the first input end is connected to a large flow regulating valve and a small flow regulating valve, the first output end is connected to the inlet of a first working pipeline, and the second output end is connected to the inlet of a first bypass; the outlet of the first working pipeline is connected to the inlet of the filling pipe through a locking valve, and the outlet of the filling pipe is connected to a target bin, so that the filling pipe can be connected to different target bins without moving the tank truck.

4. The automobile tanker capacity measurement and control system based on flow meter self-calibration according to claim 2 is characterized in that: The flow meter self-calibration measurement and control subsystem comprises: a second commutator nozzle, a second working pipeline, a second bypass, an electronic scale and an electronic scale container, and a third thermometer; in, The second diverter nozzle is provided with a second input end, a third output end and a fourth output end, the second input end is connected to the outlet of the first bypass through a stop valve, the third output end is connected to the inlet of the second working pipeline, and the fourth output end is connected to the inlet of the second bypass; the second diverter nozzle is used to guide the water flow at the inlet of the second input end into the second working pipeline or the second bypass respectively; The outlet of the second working pipeline is connected to the electronic scale container, and an electronic scale is placed at the bottom of the electronic scale container; The second bypass is connected to the external water tank; After use, the water in the electronic scale container and the target bin is discharged to the external water pool through stop valve G and stop valve H respectively; The third thermometer is used to measure the water temperature in the electronic scale.

5. A method for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration, applied to a system for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Set the minimum value of the warehouse capacity calibration time t min , the flow meter is at the flow point q The indication error is , enter the warehouse capacity calibration measurement and control subsystem, and perform the first n calibration operation, the warehouse capacity calibration time is ; S2: Enter the flow meter self-calibration measurement and control subsystem, and check the flow point q Perform the indication error check operation, take the average value of the two check results, and obtain the target bin capacity for the first n After the calibration, that is, n +1 flow point before calibration q The indication error ; S3: Set flag value BZ n , BZ n =| δ n+1 / δ n |, according to the flag value BZ n The calculation result determines the next operation behavior.

6. A method for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration according to claim 5, characterized in that: The S1 includes: S11: In flow q Under the condition of n calibration operation, the warehouse capacity calibration time is , the accumulated water capacity of the flow meter tank during the calibration time is ; S12: Flow meter accumulated water capacity After flow correction, , which is the target warehouse n A calibration result.

7. The method for measuring and controlling the capacity of a tanker truck based on flow meter self-calibration according to claim 5 is characterized in that: The S3 includes: S31: If BZ n Less than or equal to 1, then the previous After correction, ; Next warehouse capacity calibration time t n+1 With the previous t n Same; if two consecutive BZ n If the value does not exceed 1, then n +1 warehouse capacity calibration time t n+1 Restore t 1; S32: If BZ n Greater than 1 and less than or equal to 2, then the previous After correction, ; Next warehouse capacity calibration time t n+1 For the previous t n 0.8 times of the original value, shortening the warehouse capacity calibration time and increasing the number of flow meter self-calibration; S33: If BZ n Greater than 2 or t n+1 Less than t min , then suspend the calibration, find the cause, and continue after solving the problem.

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