JP2008030762A - Liquid feed system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent variations in the sensitivity of the liquid surface detection mechanism of a liquid feed nozzle. <P>SOLUTION: In the liquid feed system, the control circuit 16 of a meter 12 counts the number of times that liquid was additionally fed, which number is obtained by the liquid surface detection mechanism of a liquid feed nozzle 39 until a nozzle switch 34 is turned off after the liquid feed is finished. The control circuit 16 stores this counted number of times into a memory 44. Upon the finish of the liquid feed by the liquid feed nozzle 30, the control circuit 16 transfers the result of this count to a management terminal device 14. In the management terminal device 14, the number of times that the liquid was additionally fed, which has been counted by the control circuit 16 of the meter 12, is compared with the reference number of times for feed stop, stored in a storage device 19. Thus, an abnormal detection process to detect whether an abnormal state is present or not is performed. When an abnormal state of the liquid surface detection mechanism is detected based on the number of times that the liquid was additionally fed, the management terminal device 14 outputs an electronic mail informing a maintenance terminal device 17 in a maintenance company 13 of the abnormal state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid supply system, and more particularly to a liquid supply system configured to adjust a flow rate of liquid supplied to a liquid supply tank by operating a lever of a liquid supply nozzle.

  For example, when operating an oil supply nozzle (liquid supply nozzle) for supplying an oil liquid (liquid) such as gasoline to an automobile fuel tank (liquid supply tank), the operator holds the nozzle lever of the oil supply nozzle. The liquid supply to the fuel tank can be performed by operating and opening the valve mechanism of the nozzle. In such an oil supply device (liquid supply device) having an oil supply nozzle, the oil level of the oil supplied by the pump is manually adjusted by opening the valve mechanism of the oil supply nozzle by operating the lever of the oil supply nozzle. The flow rate is adjusted (see, for example, Patent Document 1).

  However, the pipe shape of the fuel filler port of an automobile differs depending on the vehicle type and may be bent near the fuel filler port. And when the nozzle lever is operated to the fully open position with the discharge pipe of the oil supply nozzle inserted to the back of the oil supply port, the oil liquid sent by the pump is ejected vigorously on the inner wall of the oil supply port. There was a risk that a part of it bounced off and spilled from the filler port.

In particular, when the liquid level detection mechanism provided in the liquid supply nozzle detects a rise in the liquid level and performs a valve closing operation, the operator opens the nozzle lever of the oil supply nozzle again to perform additional liquid supply. The nozzle lever was operated to an arbitrary position to prevent spilling from the fuel filler port.
JP 2000-109199 A

  Conventionally, however, it is difficult to adjust the sensitivity of the liquid level detection mechanism to be constant if there is a variation in the operation timing of the diaphragm due to variations in the processing accuracy of each component constituting the liquid supply nozzle and the assembly accuracy of each component. For example, when the sensitivity of the liquid level detection is high, the liquid particles that have bounced off the inner wall of the oil supply port even though the liquid level has not yet risen to the oil supply port will only adhere to the liquid level detection hole provided at the tip of the nozzle. There was a problem that the liquid supply was stopped by closing the valve.

  Further, when the sensitivity of the liquid level detection is low, there is a possibility that the valve closing operation may be delayed even though the liquid level has reached the fuel filler opening.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a liquid supply system that solves the above problems.

  In order to solve the above problems, the present invention has the following means.

  The present invention has a lever for adjusting a liquid supply amount by manual operation, a liquid supply nozzle having a valve mechanism for adjusting a flow rate of liquid supplied to a liquid tank by operation of the lever, A liquid level detection mechanism that is provided in the liquid supply nozzle and stops the supply of liquid from the liquid supply nozzle together with the liquid level detection operation when the tip of the discharge pipe of the liquid supply nozzle comes into contact with the liquid level of the liquid tank to be supplied A liquid supply path for supplying liquid to the liquid supply nozzle, a pump for supplying liquid to the liquid supply nozzle via the liquid supply path, and a flow rate of the liquid flowing through the liquid supply path A flow meter for measuring the liquid level, and a counting means for counting the number of times of additional liquid supply accompanying the liquid level detection by the liquid level detection mechanism performed for each liquid supply operation, and a predetermined reference Storage means for storing the reference additional liquid supply count, and the previous Abnormality detection means for detecting the presence or absence of abnormality by comparing the number of additional liquid supply counted by the counting means and the reference additional liquid supply number stored in the storage means, and abnormality detected by the abnormality detection means In some cases, an abnormality signal output means for outputting an abnormality signal is provided to solve the above-mentioned problem.

  Further, the counting means is configured to perform the liquid from a liquid supply start by a liquid supply nozzle until a predetermined liquid supply amount at which an additional liquid supply ends is supplied based on a change in a flow rate measurement value measured by the flow meter. It is desirable to count the number of stops by the surface detection mechanism.

  Further, the abnormality detection means includes a reference stop number reading means for reading a reference lower limit additional liquid supply number and an upper limit additional liquid supply number from the storage means, the additional liquid supply number, and the lower limit additional liquid supply number. In comparison, the additional liquid supply frequency is compared with the upper limit additional liquid supply number and the additional liquid supply number is less than or equal to the lower limit additional liquid supply number or the additional liquid supply number is greater than or equal to the upper limit additional liquid supply number Determining means for determining that there is an abnormality, and solves the above-mentioned problems.

  According to the present invention, in order to output an abnormality signal when the presence or absence of abnormality is detected by comparing the number of times of additional liquid supply counted by the counting means with the reference number of times of supply stoppage stored in the storage means, When the sensitivity of the surface detection mechanism is too high or too low, an abnormal signal can be output and notified, and maintenance such as inspection and repair of the liquid level detection mechanism can be performed promptly.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a system configuration diagram showing an embodiment of a liquid supply system according to the present invention. As shown in FIG. 1, the liquid supply system 10 includes a measuring machine 12 that supplies fuel such as gasoline, a control circuit 16 that controls the measuring machine 12 and the display 40, and a communication line (SS-LAN) 18. And a management terminal device 14 that are communicably connected to each other. Moreover, the management terminal device 14 is connected to the maintenance company 13 through the Internet 15 of the liquid supply station, for example.

  When the liquid supply to the vehicle is performed, the management terminal device 14 receives the liquid level detection mechanism information individually transmitted from the weighing machine 12 (for example, the number of times of additional liquid supply and the liquid level detection by the liquid level detection mechanism of the liquid supply nozzle) The presence or absence of a mechanism abnormality is stored in the storage device 19. Furthermore, the management terminal device 14 supplies fuel supply information (for example, the supply amount (supply amount) of fuel supplied to the vehicle, the type of fuel (type of liquid), the supply amount of money) output from the plurality of measuring machines 12. , Including information on payment methods).

  The management terminal device 14 reads a preset control program and executes a control process of each control program, thereby storing a reference additional liquid supply count serving as a predetermined reference in the storage device 19; An abnormality detection means for detecting the presence or absence of an abnormality by comparing the number of times of additional liquid supply counted by the control circuit 16 of the weighing machine 12 with the reference number of times of supply stoppage stored in the storage device 19, and an abnormality detected by the abnormality detection means. And an abnormal signal output means for outputting an abnormal signal when detected.

  Further, the control circuit 16 of the weighing machine 12 transmits the liquid level detection mechanism information and the fuel supply liquid information to the management terminal device 14 every time the liquid supply is completed. Then, the management terminal device 14 aggregates information transmitted from the control circuit 16 of the weighing machine 12 and periodically transmits it to the maintenance terminal device 17 of the maintenance company 13 via the public line and the Internet 15. The maintenance terminal device 17 stores the received fuel supply information and customer input information in a database (data table) 17A.

  Here, the configuration of the weighing machine 12 will be described. The weighing machine 12 is connected to a liquid supply line 20 for pumping fuel (oil liquid in the present embodiment) from an underground tank (not shown) buried underground in the liquid supply station. A flow control valve 26 is provided. A liquid supply nozzle 30 is provided at the tip of the liquid supply hose 28 communicated with the discharge port of the flow control valve 26. The flow control valve 26 is opened by a valve opening signal from the control circuit 16 and is closed when the valve opening signal is turned off.

  For example, as described in Patent Document 1 described above, the liquid supply nozzle 30 is a valve mechanism that adjusts the valve opening degree by rotating the nozzle lever, and a negative pressure that generates a negative pressure by the flow rate of the oil liquid. Generation part, one end is connected to the negative pressure generation part, the other end has an air introduction port that opens near the tip of the discharge pipe and sucks air, and the air introduction port is blocked by the rise of the liquid level due to liquid supply If so, it has a liquid level detection mechanism (liquid level detection means) that closes by negative pressure.

  The liquid level detection mechanism of the liquid supply nozzle 30 closes the air introduction port due to the liquid level rise accompanying the liquid supply, and the valve mechanism closes to stop the liquid supply. For this reason, when the liquid supply nozzle 30 is closed by detecting the liquid level, the operator operates the nozzle lever to the half-open position with the discharge pipe of the liquid supply nozzle 30 floating from the fuel supply port of the fuel tank to supply additional liquid. Manipulate as you do. Then, the operator repeats the additional liquid supply operation until the liquid level rises to the vicinity of the fuel filler opening.

  In the state where the liquid supply nozzle 30 is inserted into the oil supply port, the amount of oil that rebounds to the tip of the discharge pipe as the liquid level rises gradually increases, and the amount of oil that closes the air inlet gradually increases. To do. On the other hand, the liquid level detection mechanism built in the liquid supply nozzle 30 makes the sensitivity of the liquid level detection mechanism constant when there is a variation in the operation timing of the diaphragm due to variations in the processing accuracy of each component and the assembly accuracy of each component. Difficult to adjust.

  Further, the liquid supply nozzle 30 is hooked on a nozzle hook 32 provided on the side surface of the housing of the measuring machine 12, and is removed from the nozzle hook 32 when the fuel is supplied to the vehicle. The nozzle hook 32 is provided with a nozzle switch 34 for detecting the presence or absence of the liquid supply nozzle 30. The nozzle switch 34 is configured to be turned off when the liquid supply nozzle 30 is engaged with the nozzle hook 32 and to be turned on when the liquid supply nozzle 30 is removed from the nozzle hook 32.

  Further, the casing of the weighing machine 12 is supplied to the vehicle by a pump motor 36 that drives the liquid supply pump 22, a pulse transmitter 38 that outputs a flow rate pulse proportional to the flow rate measured by the flow meter 24, and the vehicle. A display 40 is provided for displaying the integrated value and the input liquid supply information (the set liquid type, the liquid supply amount, the payment method, etc.). The display device 40 is a touch panel made of a liquid crystal panel, and also functions as an answer input device when a customer touches a displayed selection item.

  The control circuit 16 is electrically connected to each device of the flow control valve 26, the nozzle switch 34, the pump motor 36, the pulse transmitter 38, and the display 40.

  When an ON signal is input from the nozzle switch 34, the control circuit 16 activates the pump motor 36 and opens the flow control valve 26 to enable liquid supply. Further, when the flow rate pulse is output from the pulse transmitter 38 by the valve opening operation of the liquid supply nozzle 30, the control circuit 16 displays the liquid supply amount calculated from the integrated value of the flow rate pulse on the display 40. Execute control processing.

  When the nozzle switch 34 is turned off, the control circuit 16 determines that the liquid supply has been completed. Therefore, the control circuit 16 stops the pump motor 36 and closes the flow rate control valve 26 to supply liquid according to the liquid supply amount. Calculate and display charges. Further, after the liquid supply is completed, fuel supply information (information such as liquid type, liquid supply amount, liquid supply amount, fee payment method, etc.) is stored in the memory (storage means) 44. The memory 44 temporarily stores information for several times according to the storage capacity of the memory 44, and is overwritten sequentially from the storage area of old information among the information for several times.

  Further, as will be described later, the control circuit 16 supplies the liquid supply nozzle 39 between the time when the nozzle switch 34 is turned on and the time when the liquid supply nozzle 30 turns off after the liquid supply is started. The number of additional liquid supply by the liquid level detection mechanism is counted (counting means), and the counted number of additional liquid supply is stored in the memory 44. The counting process of the number of times of additional liquid supply accompanying the liquid supply stop by the liquid level detection mechanism is, for example, from the start of liquid supply by the liquid supply nozzle 30 based on the change in the flow rate measurement value measured by the flow meter 24. It is programmed to count the number of times of additional liquid supply by the liquid level detection mechanism that is performed until a predetermined liquid supply amount to be terminated is supplied.

  Then, when the liquid supply by the liquid supply nozzle 30 is completed, the control circuit 16 transmits the count result of the number of additional liquid supply to the management terminal device 14 to the management terminal device 14 via the communication line 18. Thereby, in the management terminal device 14, the presence or absence of abnormality is compared by comparing the number of times of additional liquid supply counted by the control circuit 16 of the weighing machine 12 with the reference number of times of supply stoppage stored in the storage device 19, as described above. An abnormality detection process for detecting Then, the management terminal device 14 sends an email (abnormal signal) indicating an abnormality to the maintenance terminal device 17 installed in the maintenance company 13 when an abnormality of the liquid level detection mechanism is detected based on the number of times of additional liquid supply. Output. For this reason, the maintenance company 13 can recognize that an abnormality has occurred in the liquid supply nozzle 30 of the weighing machine 12 based on the abnormality signal transmitted from the management terminal device 14. It is possible to notify whether an abnormality has occurred in the liquid supply nozzle 30 of the measuring machine 12 at the liquid place.

  FIG. 2 is a block diagram schematically showing a communication network connecting a plurality of liquid supply stations and a maintenance company. As shown in FIG. 2, the weighing machines 12 (12A to 12Z) installed in the liquid supply stations A to Z are connected to the management terminal devices 14A to 14Z that manage the weighing machines 12 (12A to 12Z). The management terminal devices 14A to 14Z of the liquid stations A to Z are communicably connected to the maintenance terminal device 17 installed in the maintenance company 13 via the public line and the Internet 15.

  In each of the liquid supply stations A to Z, a plurality of measuring machines 12 (12A to 12Z) for supplying fuel such as gasoline to a fuel tank (not shown) of a vehicle are installed. The weighing machine 12 (12A to 12Z) is a self-service type liquid supply device, and the customer (driver) himself inputs the liquid supply setting data with the display device 40 and then performs the liquid supply operation. Yes.

  Therefore, the maintenance company 13 stores the fuel supply information and customer input information transmitted from the management terminal devices 14A to 14Z of the supply stations A to Z as needed in the database 17A.

  FIG. 3 is a flowchart for explaining the control process 1 executed by the control circuit 16 of the weighing machine 12. As shown in FIG. 3, the control circuit 16 of the weighing machine 12 checks whether or not the liquid supply nozzle 30 is hooked on the nozzle hook 32 in S11. In S11, when the nozzle switch 34 is on, the liquid supply nozzle 30 is removed from the nozzle hook 32 and liquid supply is started. Therefore, the process proceeds to S12, and the liquid supply pump 22 is activated and the liquid supply nozzle 30 is started. Then, the liquid supply is started, and the flow rate pulse from the flow meter 24 is integrated to measure the amount of liquid supply (integrated flow rate) supplied from the supply nozzle 30 to the fuel tank (not shown).

  In next S13, it is checked whether or not the liquid supply is stopped by the operation of a liquid level detection mechanism (not shown) of the liquid supply nozzle 30. The determination as to whether or not the liquid supply is stopped is made based on the state during liquid supply or the state of liquid supply stop set in S15 or S18 described later.

  That is, if it is set during liquid supply, “NO” is determined in S13, and if it is set to stop liquid supply, “YES” is determined in S13. If it is determined in S13 that the liquid supply is stopped, the process proceeds to S14 to check whether the instantaneous flow rate measured by the flow meter 24 is 1 L / min or more. When the instantaneous flow rate supplied from the liquid supply nozzle 30 in S14 is 1 L / min or more, it is determined that the oil liquid discharge from the liquid supply nozzle 30 has started, and the state of the meter 12 is determined as the liquid supply Set inside.

  Subsequently, the process proceeds to S16, and 1 is added to the number of times of additional liquid supply (the number of times of liquid supply started after the liquid supply is stopped) (counting means). Thereafter, the process returns to S11. If it is determined in S13 that the liquid supply is not stopped, the process proceeds to S17 to check whether the instantaneous flow rate measured by the flow meter 24 is 0 L / min. In S17, when the instantaneous flow rate measured by the flow meter 24 is 0 L / min, the process proceeds to S18, and it is checked whether or not the state where the instantaneous flow rate is zero continues for 1 second. In S18, when the state in which the instantaneous flow rate is zero continues for one second, the process proceeds to S19, where it is determined that the discharge of the oil from the liquid supply nozzle 30 is stopped, and the state of the meter 12 is changed to the liquid supply stop state. set.

  In S13, when the liquid supply is stopped, the process proceeds to S14 to check whether the instantaneous flow rate measured by the flow meter 24 is 1 L / min or more. When the instantaneous flow rate supplied from the supply nozzle 30 in S14 is 1 L / min or more, the state of the weighing machine 12 is set to supply liquid.

  Then, it progresses to S16 and 1 is added to the frequency | count of additional liquid supply (counting means). Thereafter, the process returns to S11. In S13, when the liquid supply is not stopped, the process proceeds to S17 to check whether the instantaneous flow rate measured by the flow meter 24 is 0 L / min. In S17, when the instantaneous flow rate measured by the flow meter 24 is 0 L / minF, the process proceeds to S18 to check whether or not the state of zero flow rate has continued for 1 second. In S18, when the state of zero flow rate continues for 1 second, the process proceeds to S19, and the state of the weighing machine 12 is set to the liquid supply stop state. Thereafter, the process returns to S11. Thus, the process of S11-S19 is repeated.

  In S11, when it is determined that the nozzle switch 34 is off and the liquid supply nozzle 30 is returned to the nozzle hook 32 to complete the liquid supply and the liquid supply is completed, the process proceeds to S20. The liquid supply pump 22 is stopped and the number of additional liquid supply times is transferred to the management terminal device 14.

  As described above, the control circuit 16 of the weighing machine 12 counts the number of times of additional liquid supply every time the liquid supply operation is performed, and the number of times of additional liquid supply performed from the start of the liquid supply to the end of the liquid supply. Is stored in the memory 44.

  FIG. 4 is a flowchart for explaining a control process executed by the management terminal device 14. As shown in FIG. 4, when the management terminal device 14 receives the number of times of additional liquid supply transmitted from the control circuit 16 of the weighing machine 12 in S <b> 31, the management terminal device 14 stores it in the storage device 19. Then, it progresses to S32 and sets the average additional liquid supply frequency of today to A, the average additional liquid supply frequency of the previous day to B, and the average additional liquid supply frequency of the day before yesterday to C.

  In next S33, whether or not the average additional liquid supply count A of today is equal to or higher than a preset lower limit set value, or whether or not the average additional liquid supply count B of the previous day is equal to or higher than a preset lower limit set value, or yesterday It is checked whether or not the average additional liquid supply count C is equal to or greater than a preset lower limit set value (abnormality detection means). Therefore, in S33, if any of the average additional liquid supply count A of today, the average additional liquid supply count B of the previous day, and the average additional liquid supply count C of the day before yesterday is not equal to or higher than the lower limit set value, the process proceeds to S34. An e-mail indicating that the liquid level detection mechanism of the nozzle 30 is not effective (the liquid level detection sensitivity is too low) is transmitted to the maintenance terminal device 17 of the maintenance company 13 (abnormal signal output means).

  Further, in S33, when any of the average additional liquid supply count A of today, the average additional liquid supply count B of the previous day, and the average additional liquid supply count C of the day before yesterday is equal to or higher than the lower limit set value, the process proceeds to S35. Whether the average additional liquid supply count A is greater than or equal to a preset upper limit set value, whether the previous day's average additional liquid supply count B is greater than or equal to a preset upper limit set value, or the average additional liquid supply count C of the day before yesterday Is more than a preset upper limit setting value (abnormality detection means).

  In S35, when any of the average additional liquid supply count A of today, the average additional liquid supply count B of the previous day, and the average additional liquid supply count C of the day before yesterday is equal to or lower than the upper limit set value, the current control process is terminated. Let

  In S35, when any of the average additional liquid supply count A of today, the average additional liquid supply count B of the previous day, and the average additional liquid supply count C of the day before yesterday is not less than the upper limit set value, the process proceeds to S36. An e-mail indicating that the liquid level detection mechanism of the nozzle 30 tends to be too effective (the liquid level detection sensitivity is too high) is transmitted to the maintenance terminal device 17 of the maintenance company 13 (abnormal signal output means).

  Thus, the management terminal device 14 is a liquid level detection mechanism of the liquid supply nozzle 30 by comparing the average additional liquid supply count counted by the weighing machine 12 with the preset lower limit set value and upper limit set value. It is possible to infer the presence or absence of abnormalities.

  FIG. 5 is a diagram schematically showing a recording format stored in the database 17A of the maintenance terminal device 17. As shown in FIG. 5, the number of additional liquid supply of the liquid supply nozzle 30 provided in the weighing machine 12 is listed from the instrument number corresponding to the registration number of each weighing machine 12. Can be easily confirmed.

  FIG. 6 is a flowchart for explaining the control process 2 executed by the control circuit 16 of the weighing machine 12. Note that the control processing in S41 to S45 shown in FIG. 6 is the same processing as S11 to S15 in FIG. Moreover, since the control process of S46-S48 shown in FIG. 6 is the same process as S17-S19 of FIG. 3 mentioned above, the description is abbreviate | omitted.

  As shown in FIG. 6, the control circuit 16 of the weighing machine 12 sets the state of the weighing machine 12 to liquid supply stop in S <b> 48, and then proceeds to S <b> 49 to store the current liquid supply amount in the memory 44. Thereafter, the process returns to S41, and the processes of S41 to S49 are repeated.

  In S41, when it is determined that the nozzle switch 34 is turned off and the liquid supply nozzle 30 is returned to the nozzle hook 32 and the liquid supply is finished, the process proceeds to S50, for example, the first by the liquid level detection mechanism. The number of additional liquid supply (4 times) is calculated when 2 liters are additionally supplied from the liquid supply amount of 32 liters when the liquid supply is stopped to supply 34 liters. In S50, for example, when the liquid supply amount at the time of the first liquid supply stop by the liquid level detection mechanism is 31.9 liters, the number of liquid supply stops is 2, so the number of additional liquid supply is 1 time. Become.

  FIG. 7 is a diagram schematically showing a recording method of the database (data table) 50 for calculating the number of times of supply stop. As shown in FIG. 7, the database 50 shows an example of data in the case where the supply stoppage is generated five times by performing the additional supply four times. Accordingly, in S50, the number of times of additional liquid supply = 5 times when the amount of liquid supply is 32 liters (= 34L-2L) is calculated from the database 50. In S51, the number of times of additional liquid supply (5 times) is calculated in the management terminal device 14. Forward.

  Thus, by calculating the number of times of additional liquid supply from the number of times of liquid supply corresponding to the amount of liquid supply at the time of liquid supply stoppage from the database 50, it is not necessary to count the number of times of additional liquid supply, and the burden of calculation processing is reduced. can do.

  FIG. 8 is a flowchart for explaining the control process 3 executed by the control circuit 16 of the weighing machine 12. As shown in FIG. 8, the control circuit 16 checks whether or not the liquid supply nozzle 30 is hooked on the nozzle hook 32 in S61. In S61, when the nozzle switch 34 is on, the liquid supply nozzle 30 is removed from the nozzle hook 32 and liquid supply is started. Therefore, the process proceeds to S62, and the liquid supply pump 22 is activated and the liquid supply nozzle 30 is started. Then, the liquid supply is started, and the flow rate pulse from the flow meter 24 is integrated to measure the amount of liquid supply (integrated flow rate) supplied from the supply nozzle 30 to the fuel tank (not shown).

  In the next S63, the flow velocity is calculated from the pulse interval (cycle) of the flow rate pulse output from the flow meter 24, and the flow velocity of the oil discharged from the liquid supply nozzle 30 is obtained. Then, it progresses to S64 and calculates a flow rate change rate from the difference of the flow rate per unit time.

  In next S65, it is checked whether or not the flow rate change rate calculated as described above is equal to or less than a predetermined reduction rate set in advance. In S65, when the calculated flow rate change rate is equal to or less than a predetermined reduction rate set in advance, it can be determined that the liquid supply stop operation by the liquid level detection mechanism of the liquid supply nozzle 30 has been performed. Therefore, when the flow rate change rate is equal to or less than the predetermined reduction rate set in advance in S65, the process proceeds to S66 and 1 is added to the count value of the number of times of additional liquid supply.

  Further, when the flow rate change rate is not less than or equal to the predetermined reduction rate set in advance in S65, the processing in S66 is omitted. In the next S67, it is checked whether or not the liquid supply nozzle 30 has been returned to the nozzle hook 32. In S67, when the nozzle switch 34 is on, the liquid supply nozzle 30 has been removed from the nozzle hook 32. Therefore, it is determined that the liquid is being supplied, the process returns to S62, and the processes of S62 to S67 are repeated. Therefore, while liquid supply is being performed by the liquid supply nozzle 30, the flow rate change rate can be monitored by repeating the processing of S62 to S67, and the liquid supply accompanying the liquid level detection operation by the liquid level detection mechanism. It is possible to determine whether or not there is a stop.

  In S67, when the nozzle switch 34 is off, it is determined that the liquid supply nozzle 30 has been returned to the nozzle hook 32, and the process proceeds to S68 to stop the liquid supply pump 22 and count the number of additional liquid supply times. The value is transmitted to the management terminal device 14. In S69, the count value of the number of times of additional liquid supply is reset to zero.

  As described above, the number of times of additional liquid supply accompanying the liquid level detection of the liquid level detection mechanism can be obtained based on the rate of change of the flow speed of the oil liquid discharged from the liquid supply nozzle 30, and the flow rate pulse of the flow meter 24 can be obtained. It is possible to determine that the additional liquid supply has been performed by a method other than the method based on the presence or absence of the liquid.

  In the said Example, although the number of times of additional liquid supply was counted in the control circuit 16 of the weighing machine 12, and the presence or absence of abnormality of the liquid level detection mechanism was determined in the management terminal device 14, it was not restricted to this, For example, it is needless to say that the control circuit 16 of the weighing machine 12 may perform a calculation process for counting the number of times of additional liquid supply and determining the presence or absence of abnormality of the liquid level detection mechanism from the counted value.

  Moreover, in the said Example, although demonstrated as what transmits the count value of the additional liquid supply count by the weighing machine 12 to the management terminal device 14, it is not restricted to this, For example, it is also transmitted to the maintenance company 13, The maintenance terminal device 17 may perform abnormality determination processing.

  In the above embodiment, in S33, either the average additional liquid supply count A of today, the average additional liquid supply count B of the previous day, or the average additional liquid supply count C of the day before yesterday is equal to or greater than a preset lower limit set value. In S35, whether the average additional liquid supply count A of the current day, the average additional liquid supply count B of the previous day, or the average additional liquid supply count C of the day before yesterday is equal to or higher than a preset upper limit set value. However, the present invention is not limited to this, and only the average additional liquid supply count A today may be compared with the lower limit set value and the upper limit set value, or the average additional supply may be compared. The presence / absence of abnormality may be determined based on the comparison result of the number of times A and B, or the presence / absence of abnormality may be determined based on the comparison result of the average number of additional liquid supply A, B and C. Of course, it is good.

1 is a system configuration diagram showing an embodiment of a liquid supply system according to the present invention. It is a block diagram which shows typically the communication network which connects between a some liquid supply station and a maintenance company. It is a flowchart for demonstrating the control process 1 which the control circuit 16 of the weighing machine 12 performs. It is a flowchart for demonstrating the control processing which the management terminal device 14 performs. It is a figure which shows typically the recording format stored in the database 17A of the maintenance terminal device 17. FIG. It is a flowchart for demonstrating the control process 2 which the control circuit 16 of the weighing machine 12 performs. It is the figure which showed typically the recording system of the database (data table) 50 for calculating the frequency | count of a liquid supply stop. It is a flowchart for demonstrating the control process 3 which the control circuit 16 of the weighing machine 12 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid supply system 12,12A-12Z Weighing machine 13 Maintenance company 14,14A-14Z Management terminal device 16 Control circuit 17 Maintenance terminal device 17A, 50 Database 18 Communication line 19 Storage device 22 Liquid supply pump 24 Flow meter 30 Liquid supply nozzle 32 Nozzle bracket 34 Nozzle switch 44 Memory

Claims (3)

A liquid supply nozzle having a lever for adjusting a liquid supply amount by manual operation and having a valve mechanism for adjusting a flow rate of liquid supplied to the liquid supply tank by operation of the lever;
Liquid level detection provided in the liquid supply nozzle and stopping the supply of liquid from the liquid supply nozzle together with the liquid level detection operation when the tip of the discharge pipe of the liquid supply nozzle comes into contact with the liquid level of the liquid tank to be supplied Mechanism,
A liquid supply path for supplying liquid to the liquid supply nozzle;
A pump for supplying liquid to the liquid supply nozzle via the liquid supply path;
A flow meter for measuring a flow rate of the liquid flowing through the liquid supply path;
In a liquid supply system having
Counting means for counting the number of times of additional liquid supply accompanying the liquid level detection by the liquid level detection mechanism performed for each liquid supply operation;
Storage means for storing a reference additional liquid supply count that is a predetermined reference;
An abnormality detecting means for detecting the presence or absence of abnormality by comparing the number of times of additional liquid supply counted by the counting means and the reference number of times of additional liquid supply stored in the storage means;
An abnormality signal output means for outputting an abnormality signal when an abnormality is detected by the abnormality detection means;
A liquid supply system comprising:   The liquid level detection performed from the liquid supply start by the liquid supply nozzle to the end of the additional liquid supply is supplied based on a change in the flow rate measurement value measured by the flow meter. The liquid supply system according to claim 1, wherein the number of additional liquid supply by the mechanism is counted. The abnormality detection means includes
A reference stop number reading means for reading the lower limit additional liquid supply number and the upper limit additional liquid supply number serving as a reference from the storage means;
The additional liquid supply frequency is compared with the lower limit additional liquid supply number, and the additional liquid supply number is compared with the upper limit additional liquid supply number, so that the additional liquid supply number is less than or equal to the lower limit additional liquid supply number or A determination means for determining that there is an abnormality when the number of additional liquid supply is equal to or greater than the upper limit additional liquid supply number;
The liquid supply system according to claim 1, further comprising:

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