JP2007137500A - Fuel feeding system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel feeding system which can detect a sign for the generation of a serious abnormality regardless of a nozzle operation for feeding a fuel. <P>SOLUTION: The control circuit 16 of a meter 12 transmits liquid feeding information and maintenance information to a management terminal device 14 every time when a liquid feeding has been completed. Then, when there is error information in the maintenance information which has been transmitted from the control circuit 16 of the meter 12, the management terminal device 14 transmits the maintenance information including the error information to a terminal device 17 for maintenance of a maintenance company 13 through a public circuit and the internet 15. Then, the control circuit 16 stores a maximum flow rate which can be delivered from a feeding nozzle as a reference delivery maximum flow rate when a fuel feeding system is normally operated, and compares a maximum flow rate from among flow rates which have been measured by a flow meter 24 with the reference delivery maximum flow rate. Then, the control circuit 16 detects abnormality when a difference between the maximum flow rate in a specified period or a specified feeding number of times being set in advance and the reference delivery maximum flow rate becomes a specified value or higher. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel supply system, and more particularly to a fuel supply system configured to determine whether there is an abnormality in a device from a change in flow rate.

  For example, a fuel supply device that supplies fuel such as gasoline to a fuel tank of an automobile has devices such as a pump, a flow meter, and a solenoid valve inside the casing, and these devices are regularly inspected, We are repairing. However, when the number of times of fuel supply is larger than usual, operation parts such as a flow meter are worn out, so that it may be necessary to perform maintenance before performing periodic inspection.

In order to meet such a demand, the present applicant measures the discharge amount in a state where the flow rate is stable when supplying fuel from the supply nozzle, and compares the average value of the measured value with the reference discharge amount to a predetermined value. If there is a difference as described above, a technique for determining an abnormality is proposed (for example, see Patent Document 1).
Japanese Patent No. 3480762

  However, since the discharge amount from the supply nozzle can be adjusted according to the operation position of the nozzle lever, the discharge amount varies depending on the operation position of the nozzle lever of the supply nozzle. Therefore, there is a possibility that it is greatly different from the reference discharge amount.

  Therefore, the above-described conventional abnormality determination method has a problem that the abnormality cannot be accurately determined when the operator measures the discharge amount in a state in which the main valve is throttled such as the half-open position of the nozzle lever. It was.

  In view of the above circumstances, an object of the present invention is to provide a fuel supply system that solves the problem.

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

  The invention according to claim 1 is a fuel supply apparatus comprising: a supply nozzle capable of adjusting a fuel discharge flow rate by a pulling degree of a nozzle lever; and a fuel supply system for supplying fuel to the supply nozzle. Reference discharge maximum flow rate storage means for storing the maximum flow rate that can be discharged from the supply nozzle when operating normally as a reference discharge maximum flow rate, and flow rate measurement means for measuring the flow rate of fuel discharged from the supply nozzle And the maximum flow rate of the flow rates measured by the flow rate measuring means and the reference discharge maximum flow rate are compared, and an abnormality is detected when the difference between the maximum flow rate and the reference discharge maximum flow rate differs by a predetermined value or more. And an abnormality detection means.

  According to a second aspect of the present invention, the abnormality detecting means compares the maximum flow rate with the reference discharge maximum flow rate in a predetermined period or a predetermined number of times of supply, and compares the maximum flow rate with the reference discharge maximum flow rate. An abnormality is detected when the difference between the values differs by a predetermined value or more.

  According to a third aspect of the present invention, a supply nozzle capable of adjusting a fuel discharge flow rate by a pulling degree of a nozzle lever, a fuel supply system for supplying fuel to the supply nozzle, the fuel supply system, and the supply nozzle Each time the flow rate of the oil liquid discharged from the nozzle reaches a predetermined unit flow rate, the flow meter emits a flow pulse, and the number of flow pulses output from the flow meter is counted to discharge from the supply nozzle. A supply amount calculation means for calculating a supply amount as an integrated flow rate of fuel, and analyzing a frequency characteristic of a flow rate pulse transmitted from the flow meter when fuel is discharged from the supply nozzle. And the frequency characteristic analyzed by the frequency characteristic analyzing means coincides with the frequency characteristic previously analyzed by the frequency characteristic analyzing means. A frequency characteristic determining means for determining whether or not, characterized in that and an abnormal signal outputting means for outputting an abnormality signal when it is determined that the frequency characteristic does not match with the frequency characteristic determining unit.

  According to a fourth aspect of the present invention, the frequency characteristic determination unit includes: a frequency change determination unit that determines whether or not a frequency at which a power spectrum is maximized among the frequency characteristics has changed; and a value of the maximum power spectrum. Power spectrum determining means for determining whether the frequency has changed, wherein the abnormal signal output means detects that the frequency has been changed by the frequency change determining means, and the power spectrum determining means When it is detected that the value of the spectrum has changed, an abnormal signal is output.

  According to the present invention, the maximum flow rate and the reference discharge maximum flow rate among the flow rates measured by the flow rate measuring means are compared, and an abnormality is detected when the difference between the maximum flow rate and the reference discharge maximum flow rate differs by a predetermined value or more. Therefore, ignore the flow rate when the operation position of the nozzle lever of the supply nozzle is not set to the fully open position, and detect the abnormality by comparing the flow rate obtained when the nozzle lever is operated to the fully open position with the reference discharge maximum flow rate. Therefore, it is possible to determine the presence or absence of abnormality without being affected by the flow rate fluctuation depending on the operation position of the nozzle lever, and it is possible to further improve the reliability of the determination result.

  Further, according to the present invention, in order to determine whether or not the frequency characteristic analyzed by the frequency characteristic analyzing means and the frequency characteristic previously analyzed by the frequency characteristic analyzing means match, it depends on the operation position of the nozzle lever. The presence or absence of abnormality can be determined without being affected by the flow rate fluctuation, and the reliability of the determination result can be further increased.

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

  FIG. 1 is a block diagram showing an embodiment of a fuel supply system according to the present invention. As shown in FIG. 1, the fuel supply system 10 includes a meter (fuel supply device) 12 installed in a liquid supply station that supplies fuel such as gasoline to an automobile, and a management terminal device 14 that manages the meter 12. And a maintenance terminal device 17 installed in the maintenance company 13. In addition, the management terminal device 14 at the liquid supply station is connected to the maintenance terminal device 17 via the public line and the Internet 15 so as to be able to communicate individually.

  Moreover, the management terminal device 14 is connected so as to be communicable with the measuring machine 12 at the liquid supply station via a communication line (SS-LAN) 18. Further, the control circuit 16 of the weighing machine 12 is communicably connected to a management terminal device 14 installed in the office of the liquid supply station via a communication line (SS-LAN) 18.

  The management terminal device 14 includes liquid supply information (including information such as the amount of liquid supplied to the vehicle, the type of oil, the amount of liquid supplied, etc.) output from the plurality of weighing machines 12, and maintenance information (total information by the weighing machine 12). (Including the amount of liquid supply, the details of abnormalities in each device, and error information such as the presence or absence of repairs). And the management terminal device 14 will store the information transmitted separately from the measuring machine 12 in the memory | storage device 19, if the liquid supply to a vehicle is performed.

  Further, the control circuit 16 of the weighing machine 12 transmits liquid supply information and maintenance information to the management terminal device 14 every time liquid supply is completed. When there is error information in the maintenance information transmitted from the control circuit 16 of the weighing machine 12, the management terminal device 14 sends the error information to the maintenance terminal device 17 of the maintenance company 13 via the public line and the Internet 15. Send maintenance information including.

  The latest error information is transferred to the maintenance terminal device 17 of the maintenance company 13 from the management terminal device 14 of the liquid supply station with which the maintenance contract is always made, and the received error information of the weighing machine 12 is stored in the database 17A. is doing.

  Therefore, an employee of the maintenance company 13 checks the maintenance information of each liquid supply station stored in the maintenance terminal device 17 and confirms on the spot where the inspection and repair are necessary. Can do. Further, the maintenance staff operates the maintenance time so as to process in order from error information having a high priority of inspection and repair based on the latest maintenance information obtained from the maintenance terminal device 17 before the departure from the sunrise. Since a schedule can be created, it is possible to efficiently perform maintenance according to the importance of the abnormality content.

  The measuring machine 12 includes a liquid supply pump 22, a flow meter (flow rate measuring means) 24, an electromagnetic valve 26, and a liquid supply line 20 that pumps oil liquid from an underground tank (not shown) buried underground in the liquid supply station. Is provided. A liquid supply nozzle (supply nozzle) 30 is provided at the tip of the liquid supply hose 28 communicated with the discharge port of the electromagnetic valve 26. The electromagnetic 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.

  The liquid supply nozzle 30 is hooked on a nozzle hook 32 provided on the side surface of the housing of the liquid supply apparatus 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.

  The casing of the liquid supply device 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. And a display 40 for displaying the integrated value.

  The control circuit 16 is electrically connected to each device of the electromagnetic valve 26, the nozzle switch 34, the pump motor 36, the pulse transmitter 38, and the display 40. The electromagnetic valve 26 opens when the valve opening signal from the control circuit 16 is turned on, and closes when the valve opening signal is turned off.

  When an ON signal is input from the nozzle switch 34, the control circuit 16 activates the pump motor 36 and opens the electromagnetic 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.

  Then, when the nozzle switch 34 is turned off, the control circuit 16 stops the pump motor 36 and closes the electromagnetic valve 26 to calculate and display a liquid supply fee corresponding to the liquid supply amount. Let

  Further, the memory 44 of the control circuit 16 stores a maximum flow rate that can be discharged from the supply nozzle when the fuel supply system is operating normally, as will be described later, as a reference discharge maximum flow rate (reference discharge maximum). The maximum flow rate and the reference discharge maximum flow rate among the flow rates measured by the flow meter 24, and the difference between the maximum flow rate and the reference discharge maximum flow rate for a predetermined period or a predetermined number of times of supply. And a control program (abnormality detection means) for detecting an abnormality when the values differ by a predetermined value or more.

  When the abnormality determination is made, the control circuit 16 notifies the management terminal device 14 and / or the maintenance terminal device 17 or one of them, or is stored in the storage device 19 before maintenance personnel perform maintenance. Maintenance information (including information for identifying an abnormality occurrence and an abnormality occurrence location) can be downloaded to a portable terminal device (not shown) such as a notebook personal computer.

  Here, the control process executed by the control circuit 16 will be described with reference to the flowchart shown in FIG. The control process 16 initializes the maximum flow rate data in S11 shown in FIG. In the next S12, liquid supply is started by opening the liquid supply nozzle 30. Then, it progresses to S13 and calculates | requires the instantaneous flow rate measured with the flowmeter 24. FIG. In S14, it is checked whether or not the instantaneous flow rate measured this time exceeds the already measured maximum flow rate data. In S14, when the instantaneous flow rate measured this time exceeds the already measured maximum flow rate data, the process proceeds to S15 and the maximum flow rate data is updated to the current instantaneous flow rate value. In S14, when the instantaneous flow rate measured this time does not exceed the maximum flow rate data already measured, the process of S15 is omitted and the process proceeds to S16.

  In S16, when the nozzle switch 34 is OFF, since the liquid is still being supplied, the process returns to S13, and the processes after S13 are performed. In S16, when the liquid supply nozzle 30 is returned to the nozzle hook 32 and the nozzle switch 34 is turned on, it is determined that the current liquid supply is completed, and the process proceeds to S17.

  In S <b> 17, the updated maximum flow rate data is transferred to the management terminal device 14. Subsequently, in S18, the updated maximum flow rate data is stored in the storage device 19. As shown in FIG. 3, the storage device 19 stores a maximum flow rate storage table 50. The maximum flow rate storage table 50 stores the maximum flow rate for each liquid supply nozzle 30, and the maximum flow rate data is updated when the value is larger than the previous data.

  In next S19, an average value of the maximum flow rate data of a predetermined number of times (for example, 100 times) measured in the past is obtained. A predetermined period (for example, 2 to 3 days) can be set instead of the predetermined number of times.

  Then, it progresses to S20 and it is checked whether the average maximum flow volume calculated by S19 is below the reference determination flow volume (abnormality detection means). As shown in FIG. 4, this determination flow rate is stored in a determination value table (reference discharge maximum flow rate storage means) 60, and the maximum flow rate (reference discharge maximum flow rate) at the nozzle number corresponding to each liquid supply nozzle 30. Flow rate) and determination count are read from the determination value table 60. Note that the shipment maximum flow rate stored in the determination value table 60 is the maximum flow rate when each device of the weighing machine 12 is operating normally, and is registered as the determination reference maximum flow rate.

  In S20, when the average maximum flow rate is equal to or lower than the determination flow rate, the process proceeds to S21, and error information indicating that the flow rate is reduced is transmitted to the management terminal device 14 and the maintenance terminal device 17 by e-mail. In S22, the error information is stored in the database 17A of the maintenance terminal device 17. This completes the current series of processing. As shown in FIG. 5, an error notification table 70 is stored in the database 17 </ b> A. The error notification table 70 includes an error occurrence date, an occurrence time, an error code, an SS code for identifying a service station, an error A device number for identifying the device in which the error occurred is stored. Therefore, the maintenance company staff can infer which abnormality is likely to occur in which measuring machine at which liquid station by looking at the error notification table 70, and the measuring machine 12 It is possible to repair the location where the error occurred before it becomes impossible to supply liquid due to a failure.

  In S20, when the average maximum flow rate is equal to or higher than the determination flow rate, the processes in S21 and S22 are omitted and the current series of processes is terminated.

  Therefore, the control circuit 16 of the weighing machine 12 compares, for example, a filter (see FIG. 5) as an abnormality before the weighing machine 12 becomes unusable by comparing the decrease in the maximum flow rate over time with the state at the time of product shipment. The condition (maximum flow rate) determined in the product specifications of the weighing machine 12 cannot be obtained at an early stage due to clogging of the flow meter 24 or the shaft 22 of the pump 22 or insufficient valve opening. Since the error information is stored in the database 17A of the maintenance terminal device 17 and notified, the maintenance of the device in which the abnormality is detected can be performed at an early stage.

  In addition, the decrease in the maximum flow rate discharged from the liquid supply nozzle 30 is caused by deterioration or wear of the components of the above devices, and the operation position of the nozzle lever (not shown) of the liquid supply nozzle 30 is a fully open position. Otherwise, the liquid level detection mechanism may be activated by a half-open operation due to the lever operation method of the operator or when the oil is blown back due to the shape of the oil filler port (due to the difference in the oil filler port between the two-wheeled vehicle and the four-wheeled vehicle). For example, the automatic valve closing mechanism may be closed. However, in the present embodiment, the liquid supply nozzle is used in S19 to obtain an average maximum flow rate of a predetermined number of times (for example, 100 times) measured in the past and determine whether the average maximum flow rate is equal to or less than a determination flow rate. The erroneous determination due to the operation position of the 30 nozzle levers is eliminated, and the reliability of the determination result of the maximum flow rate is improved.

  FIG. 6 is a flowchart for explaining a modification of the control process executed by the control circuit 16. In FIG. 6, the processes of S31 to S37 are the same as the processes of S11 to S17 described above, and thus the description thereof is omitted here.

  In S38, it is checked whether or not the current maximum flow rate data is the maximum value among all the refueling data supplied today. In S38, when the current maximum flow rate data is the maximum today, the process proceeds to S39, and the current maximum flow rate value stored in the memory 44 is updated. In S38, if the current maximum flow rate data is not the maximum today, the processes in S39 to S42 are omitted.

  In next S40, it is checked whether or not the maximum flow rate for today is equal to or less than the determination flow rate, the maximum flow rate for the previous day is equal to or less than the determination flow rate, and the maximum flow rate for the previous day is equal to or less than the determination flow rate. In S40, when the maximum flow rate is equal to or less than the determination flow rate for three consecutive days, the process proceeds to S41, and error information indicating that the flow rate has decreased is sent to the management terminal device 14 and the maintenance terminal device 17 by e-mail. To do. In S42, error information is stored in the database 17A of the maintenance terminal device 17. This completes the current series of processing.

  A maximum flow rate storage table 80 shown in FIG. 7 is stored in the database 17A. The maximum flow rate storage table 80 stores the date and the maximum flow rate value stored in association with the nozzle number of the liquid supply nozzle 30. It is remembered. Therefore, when the maximum flow rate value stored in the maximum flow rate storage table 80 is equal to or less than the 3-day continuous determination flow rate, it can be estimated that an abnormality has occurred in the device of the weighing machine 12.

  In S40, when the average maximum flow rate is equal to or higher than the determination flow rate, the processes of S41 and S42 are omitted, and the current series of processes is terminated.

  In this way, when the maximum flow rate is less than or equal to the determination flow rate for three consecutive days, when error information is transmitted, error information indicating that a flow rate decrease has occurred is transmitted to the maintenance terminal device 17, The probability that an abnormality has occurred in the device of the weighing machine 12 is high, and the reliability of abnormality detection is further enhanced.

  In S40, it is checked whether or not the maximum flow rate is not more than the determination flow rate for three consecutive days. However, the present invention is not limited to this, and it is determined that the abnormality has been detected for two consecutive days and the maximum flow rate is not more than the determination flow rate. Of course, it may be determined that the abnormality is detected with the maximum flow rate being equal to or less than the determination flow rate for four consecutive days.

  In the memory 44 of the control circuit 16 of the second embodiment, a control program (frequency characteristic analyzing means) for analyzing the frequency characteristics of the flow rate pulse transmitted from the flow meter 24 when fuel is being discharged from the liquid supply nozzle 30. A control program (frequency characteristic determination means) for determining whether or not the analyzed frequency characteristic matches the previously analyzed frequency characteristic, and outputs an abnormal signal when it is determined that the frequency characteristic does not match ( Abnormal signal output means).

  The memory 44 also includes a control program (frequency change determination means) for determining whether or not the frequency at which the power spectrum is maximized among the frequency characteristics has changed, and whether or not the value of the maximum power spectrum has changed. And a control program (power spectrum judging means) for judging the above. The configuration of this embodiment is the same as that shown in FIG.

  In the present embodiment, for example, the power spectrum of the weighing machine 12 functioning normally shown in FIG. 8 and the inner diameter of the liquid supply pipe 20 of the weighing machine 12 shown in FIG. The difference can be detected by comparing with the power spectrum of the flow rate measurement when pressure is applied.

  FIG. 8 is a graph showing the frequency characteristics of the flow rate measurement by the flow meter 24, (A) is a graph showing the change of the power spectrum (dB) when the flow rate is 48 L / min, and (B) is the flow rate of 35 L / min. (C) is a graph showing the change of the power spectrum (dB) when the flow rate is 23 L / min. Graph I has a maximum power spectrum (dB) at a peak frequency of 80 Hz, Graph II has a maximum power spectrum (dB) at a peak frequency of 58 Hz, and Graph III has a power spectrum (dB) at a peak frequency of 38 Hz. Maximum. The characteristics of graphs I to III shown in FIGS. 8A to 8C show the frequency characteristics when the device of the weighing machine 12 operates normally (the state at the time of shipment).

  On the other hand, FIG. 9 is a graph showing the frequency characteristics of the flow rate measurement by the flow meter 24 when the suction pressure is applied to the feed pump 22, and (A) shows the flow rate of 48 L / min and the suction pressure = −26 kPa. (B) is a graph showing the change of the power spectrum (dB) when the flow rate is 28 L / min and the suction pressure is −40 kPa, and (C) is a graph showing the change of the power spectrum (dB) when the flow rate is 25 L / min. It is a graph which shows the change of the power spectrum (dB) when min and suction pressure = -60kPa.

  The characteristics of the graphs IV to VI shown in FIGS. 9A to 9C are examples of the change pattern of the power spectrum (dB) when the suction pressure is reduced in the liquid supply pump 22 to generate a virtual abnormal state. Show. 9A is 80 Hz, the peak frequency of the graph V shown in FIG. 9B is 60 Hz, and the peak frequency of the graph VI shown in FIG. 9C is 40 Hz. . Therefore, the peak frequencies are substantially the same regardless of the suction pressure of the liquid supply pump 22. Therefore, by comparing the graphs I to III shown in FIGS. 8A to 8C with the graphs IV to VI shown in FIGS. 9A to 9C, is an abnormality occurring in the flow meter 24? It turns out that it becomes possible to determine whether or not. For example, when comparison is made at the same peak frequency (frequency 80 Hz, 58 to 60 Hz, 38 to 40 Hz) by the frequency change determination means, the values of graphs IV to VI shown in FIGS. 9 (A) to (C) are shown in FIG. 8 (A). It can be seen that it is lower than the values of graphs I to III shown in (C).

  FIG. 10 is a flowchart for explaining a control process executed by the control circuit 16 according to the second embodiment. The control process 16 initializes the maximum flow rate data in S51 shown in FIG. In the next S52, liquid supply is started by opening the liquid supply nozzle 30. Subsequently, the process proceeds to S53, and it is checked whether or not a predetermined time Ta (for example, Ta = 30 seconds) set in advance has elapsed. In S53, when the predetermined time Ta has not elapsed, the process proceeds to S54 to check whether the nozzle switch 34 is ON. In S54, when the nozzle switch 34 is OFF, since the liquid is still being supplied, the process returns to S53 and the processes after S53 are performed again.

  In S54, when the liquid supply nozzle 30 is returned to the nozzle hook 32 and the nozzle switch 34 is turned on, it is determined that the current liquid supply is completed, and the process proceeds to S17. In S53, when the predetermined time Ta has elapsed, the process proceeds to S55, in which the A / D conversion value of the flow rate pulse output from the flow meter 24 is measured. In S56, the value measured in S55 is stored in the memory 44. (Supply amount calculating means).

  In the next S57, it is checked whether the nozzle switch 34 is on. In S57, when the nozzle switch 34 is OFF, since the liquid is still being supplied, the process proceeds to S58, and it is checked whether or not a predetermined time Tb (for example, Tb = 10 seconds) has elapsed. In S58, when the predetermined time Tb has not elapsed, the process proceeds to S59, and it is checked whether or not the predetermined time Tc (for example, Tc = 1 μsec) has elapsed (Ta> Tb> Tc). In S59, when the predetermined time Tc has elapsed, the process returns to S56, and the measurement process of the A / D conversion value of the flow rate pulse after S56 is executed. Accordingly, the measurement processing in S55 and S56 is repeated until a predetermined time Tb (for example, Tb = 10 seconds) elapses at an interval of the predetermined time Tc (for example, Tc = 1 μsec).

  When the predetermined time Tb has elapsed in S58 and when the predetermined time Tc has not elapsed in S59, the process returns to S57 and the processes after S57 are performed. In S57, when the liquid supply nozzle 30 is returned to the nozzle hook 32 and the nozzle switch 34 is turned on, it is determined that the liquid supply is completed, and the process proceeds to S60, and the measurement data is sent to the management terminal device 14. Forward.

  Then, it progresses to S61 and memorize | stores measurement data in the memory | storage device 19. FIG. In the next step S62, the measurement data of the flow rate pulse is subjected to a fast fourier transformation (FFT) process to obtain a power spectrum (see graphs I to VI in FIGS. 8 and 9) (frequency characteristic analysis means) ).

  In S63, the power spectrum at the peak frequency at the time of product shipment (see graphs I to III in FIG. 8) is compared with the power spectrum at the current peak frequency, and the value of the power spectrum at the current peak frequency is determined. It is checked whether or not the value is larger than the value at the time of shipment (frequency characteristic determination means).

  In S63, when the value of the power spectrum at the current peak frequency is larger than the value at the time of shipment, the process proceeds to S64, and error information indicating that there is a possibility of occurrence of abnormality in the weighing machine 12 is sent by e-mail. It transmits to the management terminal device 14 and the maintenance terminal device 17 (abnormal signal output means). In S65, error information is stored in the database 17A of the maintenance terminal device 17. This completes the current series of processing.

  In S63, if the value of the power spectrum at the current peak frequency is smaller than the value at the time of shipment, the processes of S64 and S65 are omitted and the current series of processes is terminated.

  As described above, when the value of the power spectrum at the current peak frequency is larger than the value at the time of shipment, error information indicating the occurrence of an abnormality is transmitted to the maintenance terminal device 17, so that the error information is transmitted. Has a high probability that an abnormality has occurred in the device of the weighing machine 12, and the reliability of abnormality detection is further enhanced.

  FIG. 11 is a flowchart for explaining an abnormal part specifying process executed by the control circuit 16 according to the second embodiment. As shown in FIG. 11, in S71, it is checked whether or not the maximum discharge amount has decreased (frequency change determination means). In S71, when the maximum discharge amount is decreased, the process proceeds to S72, and it is checked whether or not the value of the power spectrum is decreased (power spectrum determining means).

  In S72, when the value of the power spectrum decreases, the process proceeds to S73, where it is determined that the decrease in the maximum discharge amount is due to cavitation, and an instruction is given to inspect the following parts in S74. As the inspection instruction site in S74, for example, the presence or absence of cracks in the suction pipe, changes in the head, clogging of the filter and strainer, factors according to the season such as oil temperature, etc. are displayed on a display (not shown).

  If the value of the power spectrum does not decrease in S72, the process proceeds to S75, where it is determined that the discharge performance is decreased, and instructed to inspect the following parts in S76. As the inspection instruction site in S76, for example, (1) a site serving as a driving source such as a motor, a pump, and a power supply voltage, and (2) a site having a valve mechanism such as a valve of the liquid supply nozzle 30 and an electromagnetic valve 26 (see FIG. (Not shown).

  Further, in S71, when the maximum discharge amount does not decrease, the process proceeds to S77 and is determined to be normal.

  Further, in this embodiment, the abnormality content can be determined by changing the value of the power spectrum, and the operator can be instructed on the site to be inspected, so that maintenance work is performed when a sign of abnormality occurrence is detected. It is possible to instruct at an early stage, and further, it is possible to shorten the maintenance work time by first inspecting the instructed part, and it is possible to efficiently repair the abnormal part.

  In the above-described embodiments, the case where fuel such as gasoline is supplied has been described as an example. However, the present invention is not limited to this and can be applied to other fuel supply devices.

It is a block diagram which shows one Example of the fuel supply system by this invention. 3 is a flowchart for explaining a control process executed by a control circuit 16; It is the figure which showed the maximum flow volume storage table 50 typically. It is the figure which showed the judgment value table 60 typically. It is the figure which showed the error alerting | reporting table 70 typically. 7 is a flowchart for explaining a modification of the control process executed by the control circuit 16; It is the figure which showed the maximum flow volume storage table 80 typically. 3 is a graph showing frequency characteristics of flow rate measurement by a flow meter 24. It is a graph which shows the frequency characteristic of the flow measurement by the flowmeter 24 when suction pressure is applied to the feed pump 22. 6 is a flowchart for explaining a control process executed by a control circuit 16 according to the second embodiment. 10 is a flowchart for explaining an abnormal part specifying process executed by a control circuit 16 according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel supply system 12 Metering device 14 Management terminal device 16 Control circuit 17 Maintenance terminal device 17A Database 19 Storage device 20 Liquid supply line 22 Liquid supply pump 24 Flow meter 26 Solenoid valve 30 Liquid supply nozzle 32 Nozzle hook 34 Nozzle switch 44 Memory 50 Maximum flow rate storage table 60 Determination value table 70 Error notification table 80 Maximum flow rate storage table

Claims (4)

A supply nozzle capable of adjusting the fuel discharge flow rate according to the degree of pulling of the nozzle lever;
A fuel supply system having a fuel supply system for supplying fuel to the supply nozzle;
Reference discharge maximum flow rate storage means for storing, as a reference discharge maximum flow rate, a maximum flow rate that can be discharged from the supply nozzle when the fuel supply system is operating normally;
Flow rate measuring means for measuring the flow rate of fuel discharged from the supply nozzle;
An abnormality detection that compares a maximum flow rate among the flow rates measured by the flow rate measuring means with the reference discharge maximum flow rate, and detects an abnormality when a difference between the maximum flow rate and the reference discharge maximum flow rate differs by a predetermined value or more. Means,
A fuel supply system comprising:   The abnormality detection unit compares a maximum flow rate in a predetermined period or a predetermined number of supply times with the reference discharge maximum flow rate, and a difference between the maximum flow rate and the reference discharge maximum flow rate differs by a predetermined value or more. The fuel supply system according to claim 1, wherein an abnormality is detected. A supply nozzle capable of adjusting the fuel discharge flow rate according to the degree of pulling of the nozzle lever;
A fuel supply system for supplying fuel to the supply nozzle;
A flow meter that is provided in the fuel supply system and emits a flow rate pulse every time the flow rate of the oil discharged from the supply nozzle reaches a predetermined unit flow rate;
A supply amount calculating means for calculating a supply amount as an integrated flow rate of the fuel discharged from the supply nozzle by counting the number of flow rate pulses output from the flow meter;
A fuel supply system comprising:
A frequency characteristic analyzing means for analyzing a frequency characteristic of a flow rate pulse transmitted from the flow meter when fuel is discharged from the supply nozzle;
A frequency characteristic determining means for determining whether or not the frequency characteristic analyzed by the frequency characteristic analyzing means and the frequency characteristic previously analyzed by the frequency characteristic analyzing means match;
An abnormal signal output means for outputting an abnormal signal when the frequency characteristic determining means determines that the frequency characteristics do not match;
A fuel supply system comprising: The frequency characteristic determining means includes
Frequency change determination means for determining whether or not the frequency at which the power spectrum is maximized among the frequency characteristics has changed,
Power spectrum determining means for determining whether the value of the maximum power spectrum has changed,
The abnormal signal output means outputs an abnormal signal when the frequency change determining means detects that the frequency has changed and the power spectrum determining means detects that the value of the power spectrum has changed. The fuel supply device according to claim 3, wherein:

Images