JPH04215999A - Control device for supplying constant amount of liquid - Google Patents

Abstract

PURPOSE:To permit a liquid feeding operator to be warned of the need to inspect a liquid feeding device before occurrence of the failure of a pump or a pump motor for the liquid feeding device. CONSTITUTION:A minimum flow amount storage part 18c is provided which stores in memory as a predetermined value the smallest feed amount of all the excessive feed amounts caused by the inertia of the load on a pump 8 and pump motor 7 after the electrically-driven pump motor 7 has been deenergized. Each time a preset or integer control oil feeding is effected, it is judges whether or not the actual excessive feed amount is smaller than the aforesaid predetermined value and, if so, an alarm 13f makes a buzzing sound to warn the oil feeding operator of the need to inspect the liquid device affected.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a fixed-quantity liquid supply control device that accurately supplies liquid according to a preset value by repeatedly supplying and stopping the liquid, and more particularly, The present invention relates to a quantitative liquid supply control device suitable for application to a gas station refueling system, etc.

0002

2. Description of the Related Art As a method for quantitatively supplying liquid used in this type of device, for example, as shown in Japanese Patent Laid-Open No. 56-142198, a desired amount of liquid to be supplied is set as a preset value, and during liquid supply, The flow rate per unit time, that is, the flow rate, is measured, and when the supply of liquid is completed, which is less than the expected throughput amount according to the preset value, the pump drive motor is deenergized, and this motor is A quantitative liquid supply method is known in which the inertia of the pump and the liquid flow continues to supply liquid by the amount of overflow even after deenergization of the pump, and finally the overflow amount enables liquid supply corresponding to a preset value.

However, in the above-mentioned fixed-rate liquid supply method, the amount of flow itself depends on the flow rate of the fluid to be measured when the pump drive motor is de-energized. If the flow rate changes, the overflow amount will fluctuate, so the overflow amount must be calculated while constantly monitoring the flow velocity, which has the drawback of complicating the configuration. Second, if the flow rate increases after measuring the flow rate, there are disadvantages such as being susceptible to fluctuations in the flow rate, such as overflow due to continued liquid supply even after reaching the preset value, and the inability to accurately dispense a fixed amount of liquid. Ta.

[0004] Therefore, in order to perform accurate metered liquid supply regardless of the amount of overflow, the applicant of the present application previously published Japanese Patent Application Laid-Open No. 59-1
No. 95715 is proposed. The metered liquid supply system described in this publication stores in advance a predetermined value that is greater than or equal to the maximum overflow amount that occurs when the motor that drives the pump is de-energized when the pump is in steady operation. A plurality of inching data are stored in advance, each consisting of an overflow storage unit, a minute energizing time of the motor, and the maximum amount of fluid that will be supplied when the motor is energized during this minute energizing time. An inching data storage section is provided to perform the following control. When preset liquid supply is performed, the motor is de-energized once the value obtained by subtracting the above prescribed value from the preset value is counted, and the amount of liquid supplied when the pump stops rotating does not exceed the above preset value. At this point, if the preset value matches the amount of liquid actually supplied, the liquid supply is terminated. In addition, if the amount of fluid actually supplied has not reached the preset value, subtract the amount of fluid actually supplied from the preset value to obtain the additional fluid supply amount, and calculate the additional fluid supply amount. The actual liquid supply amount exceeds the preset value by reading out the minute energization time of the motor to achieve the desired goal from the inching data storage section, and energizing the motor for this minute energization time to bring it closer to the preset value. This system enables accurate preset liquid supply.

[0005]

SUMMARY OF THE INVENTION Although the above-mentioned prior art liquid supply device does not cause overflow and is very effective, it has the following problems.

[0006] When a liquid supply device is used for many years, the liquid supply capacity decreases due to a decrease in the torque and horsepower of the pump motor, and a decrease in the liquid suction capacity of the pump. The only external phenomenon that appears on the liquid supply device due to such a state is that the liquid supply time becomes slightly longer than normal, so the liquid supply operator does not notice it until the liquid supply device breaks. For this reason, if the fluid supply device is broken due to repeated fluid supply by the fluid supply operator despite the need for maintenance and inspection of the fluid supply device, the fluid supply device must be serviced. The device becomes unusable until it is repaired.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a liquid supply operator is notified of the necessity of inspecting the liquid supply apparatus before the liquid supply apparatus breaks down.

[0008] Therefore, the first configuration of the present invention is as follows:

000
9. A pump driven by a motor, a measuring means for measuring the flow rate of the measured fluid fed by the pump, and a preset setting means for setting a desired amount of fluid to be supplied as a preset value in advance when supplying the fluid; a first storage means in which a maximum amount of overflow is stored as a predetermined value among the overflow amounts that occur when the motor is deenergized while the pump is in steady operation due to energization of the motor; and the preset means a first liquid supply control means for deenergizing the motor when the measuring means measures a flow rate corresponding to a value obtained by subtracting a predetermined value stored in the first storage means from a preset value set by the first storage means; In the metered liquid supply control device, a minimum throughflow is stored as a predetermined value among the throughflows that occur when the motor is de-energized while the pump is in steady operation due to the energization of the motor. and an actual displacement amount generated by de-energizing the motor while the pump is in steady operation due to the energization of the motor is stored in the second storage means. The present invention is characterized in that an abnormality detection means is provided for detecting an abnormality in the quantitative liquid supply control device when the amount of overflow is less than the minimum amount.

[0010] Furthermore, the second configuration of the present invention is as follows:

0011
] A pump driven by a motor, a measuring means for measuring the flow rate of the fluid to be measured delivered by the pump, a preset setting means for setting a desired amount of fluid to be supplied as a preset value at the time of supplying the fluid, and the motor. a first storage means in which a maximum amount of displacement is stored as a predetermined value among the amounts of displacement generated when the motor is deenergized while the pump is in steady operation due to energization of the pump; The minute flow rate, including the amount of overflow that occurs when the motor is instantaneously energized when the fluid to be measured is not flowing, is the instantaneous energization time of the motor to convey this minute flow rate. A flow rate corresponding to a value obtained by subtracting a predetermined value stored in the first storage means from a preset value set by the second storage means and the preset means is measured by the measurement means. a first liquid supply control means for deenergizing the motor when the motor is deenergized; The difference between the measured fluid and the measured fluid is calculated based on the second storage means, and the instantaneous energization time of the motor to send the minute flow rate corresponding to this difference is calculated based on the second storage means, and the next time the motor is activated. and a second fluid supply control means for driving the pump by energizing the motor for the set time, and the throughput amount based on the operation of the first fluid supply control means is After the fluid has completely flowed, the difference between the preset value and the flow rate of the fluid to be measured measured by the measuring means is supplied by operating the second fluid supply control means, and the fluid supply for the preset value is completed. In the metered liquid supply control device according to the present invention, the minimum minute flow rate, which includes the overflow amount that occurs when the motor is energized for a minute time while the pump is stopped and the fluid to be measured is not flowing, is calculated as the flow rate. A third storage means in which the correspondence with the flow rate is stored, and an actual additional oil supply amount performed by the second liquid supply control means is smaller than the minimum minute flow rate stored in the third storage means. The present invention is characterized in that an abnormality detecting means is provided for detecting an abnormality in the quantitative liquid supply control device when the amount is low.

0012

[Embodiment] In FIG. 1, 1 is an underground tank, 2 is a pipe, one end of the pipe 2 communicates with the underground tank 1, and the other end communicates with the underground tank 1 through a delivery unit 4 installed at an elevated location 3 at a gas station. It communicates with a refueling hose 6 having a refueling nozzle 5 at its tip. A pump 8 driven by a pump motor 7 and a flow meter 9 for measuring the amount of oil supplied are installed in the middle of the piping 2. A flow rate pulse transmitter 10 is provided that transmits a flow rate pulse signal.

Furthermore, a hose lifting mechanism (not shown) in the delivery unit 4 is attached to the refueling hose 6 near the refueling nozzle 5 to prevent the refueling nozzle 5 from getting in the way of vehicle entry and exit. Lifting switch 1 that raises and lowers to either the standby position A, which is not suitable for refueling, or the refueling position B, which is suitable for refueling.
1, a type setting key 12a for specifying whether the current refueling is a preset refueling amount or a preset refueling amount, and a numeric keypad 12b for setting a desired refueling amount or refueling amount as a preset value. A preset setting device 12 is provided.

[0014] Here, the lift switch 11 will be explained. First, when a refueling worker lowers the lift switch 11 to lower the refueling nozzle 5 from the standby position A to the refueling position B in order to refuel a refueled vehicle, the lift switch 11 outputs a lowering signal. It has become. Further, when the refueling of the refueled vehicle is completed and the lift switch 11 is operated upward in order to raise the refueling nozzle 5 from the refueling position B to the standby position A, the lift switch 11 outputs a rise signal. There is.

Next, the preset setting device 12 will be explained. First, when a refueling operator selects preset refueling with a refueling amount by operating the type setting key 12a, a type setting signal a is output from the type setting key 12a, and the refueling operator selects preset refueling with a refueling amount. When selected, a type setting signal b is output from the type setting key 12a. Next, when the refueling operator sets a desired amount of refueling or amount of refueling by operating the numeric keypad 12b, the numeric keypad 12b outputs this numerical value as numerical data.

Reference numeral 13 denotes a display, and the display 13 includes, in addition to a refueling amount display 13a, a refueling amount display 13b, and a refueling unit price display 13c, the refueling amount or refueling amount set by the operation of the preset setting device 12. A preset value display 13d that displays the amount and a preset type display 13e,
An alarm 13f is provided to notify when a refueling abnormality signal is supplied from the MPU 15, which will be described later.

Reference numeral 14 denotes a control device installed in a non-hazardous area within the gas station.

Next, the internal configuration of the control device 14 will be explained with reference to FIG. In FIG. 2, the same reference numerals are given to those explained in FIG. 1, and the explanation thereof will be omitted.

In FIG. 2, 15 is a microprocessor (hereinafter referred to as MPU), 16 is an interface, 1
7 is a program memory of the MPU 15, 18 is a data memory, 19 is a pump drive circuit, 20 is a pump switch, 2
Reference numeral 1 indicates a display driving circuit, and reference numeral 22 indicates a hose lifting mechanism provided within the delivery unit 4.

First, the control contents of the MPU 15 will be explained.

When the lowering signal is supplied from the lift switch 11, the MPU 15 drives the hose lifting mechanism 22 downward to lower the refueling nozzle 5 from the standby position A to the refueling position B, and also displays the refueling amount on the display 13. The display 13a and the refueling amount display 13b are reset to zero, and the refueling nozzle 5
When the pump has descended to the refueling position B, the lowering drive of the hose elevating mechanism 22 is stopped and the pump motor 7 is driven. Then, when refueling is started, the flow rate pulse transmitter 1
The amount of refueling and amount of refueling are calculated by counting the flow rate pulses outputted from 0, and the amount of refueling and amount of refueling calculated thereby are displayed on the refueling amount display 13a and the refueling amount display 13b of the display 13, respectively. It looks like this.

Further, when the MPU 15 receives a rise signal from the lift switch 11, it drives the hose lift mechanism 22 upward to raise the refueling nozzle 5 from the refueling position B to the standby position A, and also causes the refueling nozzle 5 to When raised to the standby position A, the raising drive of the hose elevating mechanism 22 is stopped, and when the pump motor 7 is being driven, the drive of the pump motor 7 is stopped.

Furthermore, the MPU 15 has a preset setting device 1.
When type setting signal a or type setting signal b and numerical data are supplied from 2, it is determined whether the refueling operator is about to perform preset refueling based on the refueling amount or depending on the refueling amount depending on the content of the type setting signal. It is designed to determine whether preset lubrication is to be performed. That is, when the MPU 15 determines that the type setting signal a is input from the preset setting device 12 described above, it recognizes that the numerical data indicates the amount of oil to be supplied, and sets this numerical value as the preset value P. do. In addition, if it is determined that the type setting signal b is input from the preset setting device 12 described above, the numerical data is recognized as indicating the refueling amount, and this value is divided by the refueling unit price to refuel. The value converted into the amount is set as the preset value P. Further, the preset amount of refueling or the amount of refueling is controlled to be displayed on the preset value display 13d and the preset type display 13e of the display 13. Next, when refueling of the vehicle to be refueled is started, the MPU 15 outputs a control signal to the pump drive circuit 19 based on the preset value P to open and close the pump switch 20, and the pump motor 7 Controls the cutoff and supply of electricity.

Next, the data memory 18 will be explained.

The data memory 18 includes an excess amount storage section 18a.
, inching data storage section 18b, minimum flow value storage section 1
8c, a refueling amount storage section 18d that stores the refueling amount corresponding to the preset data set by the preset setting device 12, and a unit price storage section 18e that stores the unit price of fuel.

The overflow storage section 18a stores the overflow amount that occurs due to the inertia of the pump 8 and the liquid flow when the pump motor 7 is deenergized while the pump 8 is in steady operation due to the energization of the pump motor 7. , a predetermined value K that is the maximum overflow amount, a predetermined value L that is the minimum overflow amount, and the above maximum from when the pump motor 7 is deenergized while the pump 8 is being operated steadily by the energization of the pump motor 7. The time required for the passing amount to finish flowing (hereinafter referred to as passing time) is stored.

The inching data storage section 18b contains the data shown in FIG.
As shown in , the pump motor 7 is deenergized and the pump 8
The maximum minute flow rate q1 to qn, which includes the overflow amount that occurs when the pump motor 7 is instantaneously energized and then de-energized while the pump motor 7 is stopped, is the maximum minute flow rate q1 to qn, which includes the overflow amount that occurs when the pump motor 7 is instantaneously energized and then de-energized. The time required for the flow rate q1 to qn to finish flowing (hereinafter referred to as pump rotation time) T1 to T
n, and the minimum instantaneous energization time of the pump motor 7 (hereinafter referred to as
The correspondence between t1 and tn (referred to as minimum energization time) is set and stored as data using each maximum minute flow rate qm (m=1, 2,...n) as an index. Here, the plurality of maximum minute flow rates q1 to q set in advance are
The selection of the minimum energizing time tm (m=1, 2,...n) of the pump motor 7 for sending the liquid can be performed, for example, by applying the pump motor 7 to a plurality of predetermined minute times tm.
Instantly energize each of them multiple times for each minute time t.
This is done based on the maximum flow rate confirmed at every instantaneous activation of m. Further, the pump motor 7 for delivering the plurality of preset maximum minute flow rates q1 to qn
The selection of the pump rotation time Tm (m=1, 2,...n) corresponding to the minimum energization time t1 to tn is as follows:
Each of the above-mentioned energizing times tm (m=1, 2,...n)
Measure the time required from the time when the pump motor 7 is energized when the maximum flow rate recorded when the pump motor 7 is energized until the maximum flow rate is completed, and based on this time. will be carried out.

As shown in FIG. 4, the minimum flow rate value storage section 18c stores the energization times t1 to tn and the energization times t1 to tn, and the energization times t1 to tn when the pump motor 7 is deenergized and the pump 8 is stopped.
The minimum minute flow rates p1 to pn that occur when the is energized for the energizing time t1 to tn are each energizing time tm (
m=1, 2, . ．． ．． n) is set and stored as data with index. Here, the selection of the plurality of preset energizing times t1 to tn and the minimum minute flow rates p1 to pn that are sent when the pump motor 7 is driven is, for example, a plurality of predetermined energizing times for the pump motor 7. This is performed by instantaneously energizing each time tm a plurality of times and selecting the smallest flow rate among the flow rates confirmed at each instantaneous energization for each energizing time tm as the minimum minute flow rate.

Next, using the flowchart in FIG.
The control configuration of U15 will be explained.

The refueling nozzle 5 is in the standby position A shown in FIG.
In the initial state (standby state) in which the unit price stored in the unit price storage section 18e is displayed, the MPU 15 determines whether or not a descending signal is supplied from the up/down switch 11 (STEP 1). Here, when the refueling worker lowers the lift switch 11, the lift switch 11 moves to M.
A descending signal is supplied to the PU 15, and the MPU 15, into which this descending signal is input, drives the hose lifting motor (not shown) of the hose elevator 22 to drive the refueling hose 6 in normal rotation so as to let it out. A reset signal is output to the fuel amount display 13a and the fuel amount display 13b via the display drive circuit 21, and the fuel amount display 13a and the fuel amount display 13b are reset to zero (STEP 2).

Next, the MPU 15 determines whether or not a refueling position detection signal is supplied from a position detection device (not shown) consisting of a cam switch or the like of the hose lifting mechanism 22 (S
TEP3). If it is determined in STEP 3 that the refueling position detection signal has been supplied, the hose lifting motor is deenergized, and the interface 1
A closing command signal is output to the pump drive circuit 19 via the pump switch 6 to close the pump switch 20, and the pump motor 7
energize (STEP 4).

Next, the refueling operator operates the preset setting device 12.
When the type setting signal and numerical data are output from the preset setting device 12 by operating , the MPU 15 reads them via the interface 16 and stores them as the current preset value P in the oil supply amount storage section 18d. At the same time, the display drive circuit 21 is driven via the interface 16 to display the set refueling amount or refueling amount on the preset display 13d and the preset type display 13e (STEP 5).

Then, when the refueling nozzle 5 is operated to actually start refueling, the MPU 15 activates the flow rate pulse generator 1.
The flow rate pulses output from 0 are taken in and counted through the interface 16, and the refueling amount Q and refueling amount are displayed on the refueling amount display 13a and the refueling amount display 13b via the interface 16 and the display drive circuit 21 (
Along with STEP 6), check whether the subtracted value obtained by subtracting the oil supply amount Q from the preset value P is equal to the predetermined value K stored in the overflow amount storage section 18a of the data memory 18, that is, the preset value P Compare and judge whether refueling with a value K smaller than 1 has been completed (ST
EP 7). If it is determined in STEP 7 that refueling is not completed, refueling is continued. Also, ST
In EP 7, when it is determined that refueling is completed, the MPU 15 outputs an opening command signal to the pump drive circuit 19 via the interface 16, and the pump switch 2
0 is opened to cut off the power supply from the power source E to the pump motor 7, de-energize the pump motor 7, and record the amount of refueling Q1 at the time when the pump motor 7 is de-energized as the refueling data in the data memory 18. The information is stored in a storage unit (not shown) (STEP 8). Furthermore, the MPU 15 starts measuring time using a built-in timer (not shown) from the time when the power supply to the pump motor 7 is cut off in STEP 8 (STEP 9).

Here, even after the pump motor 7 is deenergized, a flow rate pulse is output as a passing amount due to the inertia of the pump 8 and the liquid flow, but the MPU 15 also takes in this flow rate pulse via the interface 16 and counts it. Lubrication amount Q
and the refueling amount, and drives the display drive circuit 21 via the interface 16 to display the refueling amount Q and the refueling amount on the refueling amount display 13a and the refueling amount display 13b (STEP 10).
It is determined whether the time measurement started at step 9 has reached the elapsed time stored in the elapsed amount storage section 18a (S
TEP 11). If it is determined in STEP 11 that the time measurement has reached the elapsed time, the stop of the pump 8 is detected, the time measurement started in STEP 10 is stopped and reset (STEP 12), and the current oil supply amount Q2 is determined. From STEP 11 described above, the refueling data storage section (not shown) of the data memory 18 is
Subtract the refueling amount Q1 stored in ST to find the overflow amount (ST
EP 13), it is determined whether or not this overtravel amount is equal to or greater than a predetermined value L stored in the overtravel amount storage section 18a of the data memory 18 (STEP 14). STEP 1
In step 4, if it is determined that the amount of overflow is not equal to or greater than the predetermined value L, the processing from STEP 32 to be described later is performed. Further, in STEP 14, if it is determined that the overflow amount is equal to or greater than the predetermined value L, it is determined whether the current refueling amount Q2 has reached the preset value P (STEP
15).

[0035] In STEP 15, the amount of oil supplied Q2
When it is determined that M has reached the preset value P,
The PU 15 detects that the current preset oil supply is completed, and determines whether a lowering signal is input from the lifting switch 11 (STEP 16). In this state, when the refueling worker operates the lift switch 11 to raise, a rise signal is supplied from the lift switch 11 to the MPU 15,
As a result, the MPU 15 determines that a rising signal has been input, clears the preset value P, and drives the hose lifting motor (not shown) of the hose lifting mechanism 22 to reverse the refueling hose 6 so as to wind it up. Drive (ST
EP 17).

Next, the MPU 15 determines whether a standby position detection signal is supplied from a position detection device (not shown) consisting of a cam switch or the like of the hose lifting mechanism 22 (S
TEP18). If it is determined in STEP 18 that the refueling position detection signal has been supplied, the hose elevating motor is deenergized (STEP 19), and the process returns to the standby state.

Further, in STEP 15, if it is determined that the oil supply amount Q2 has not reached the preset value P, the MPU 15 changes the value of this oil supply amount Q2 to the oil supply amount Q1.
The data is updated and stored in the refueling data storage section (not shown) of the data memory 18 (STEP 20), and
The additional amount of oil required to complete the current preset oiling is determined by subtracting the current amount of oil from the preset value P (STEP 21), and the additional amount of oil is added from the inching data storage section 18b of the data memory 18. The minimum energization time tm of the pump motor 7 required to
Read out (m 1, 2,...n) (STEP
22). Then, the MPU 15 again outputs a closing command signal to the pump drive circuit 19 via the interface 16, closes the pump switch 20, and energizes the pump motor 7 (STEP 23). Start timing by a timer (not shown) (
STEP 24). Then, in STEP 23, when the pump 8 is driven and a flow pulse is output from the flow pulse generator 10, the MPU 15 takes in the flow pulse through the interface 16, calculates the amount of refueling Q2 and the amount of refueling, and sends the flow pulse to the interface 16. The display driving circuit 21 is driven through the fuel supply amount Q2 and the fuel amount displayed on the fuel amount display 13a and the fuel amount display 13b.
(STEP 25). Next, the MPU 15 executes the time measurement started in STEP 24 described above.
It is determined whether the minimum energizing time tm read in step 22 has been reached (STEP 26). STEP26
When it is determined that the time measurement started in has reached the minimum energization time tm, the MPU 15
An opening command signal is output to the pump drive circuit 19 via (
STEP 27), with this, the pump switch 20
is opened, the power supply from the power source E to the pump motor 7 is cut off, and the pump motor 7 is deenergized. Next, MPU1
Step 5 determines whether the time measurement started in STEP 24 has reached the pump rotation time (STEP
28) If it is determined that this time has reached the pump rotation time, the stoppage of the pump 8 is detected and the step described above is performed.
Stop/reset the timing started in step 28 (ST
EP 29) as well as the energizing time t1 to t2 stored in the minimum flow value storage section 18c of the data memory 18.
An energizing time corresponding to the minimum energizing time tm read out in STEP 22 is selected from among them, and the minimum minute flow rate corresponding to the selected energizing time is read out (STEP 30). Next, the MPU 15 subtracts the oil supply amount Q1 stored in the oil supply data storage section (not shown) of the data memory 18 in the aforementioned STEP 20 from the current oil supply amount Q2, and pumps the oil for the minimum energization time tm. By energizing the motor 7, the amount of additional oil actually supplied is determined (
STEP 31), this additional oil supply amount is
It is determined whether the flow rate is equal to or higher than the minimum minute flow rate read in step 30 (STEP 32).

If it is determined in STEP 32 that the additional oil supply amount is equal to or greater than the minimum minute flow rate, the process in STEP 15 described above is performed again. Also, STEP
32, if it is determined that the additional oil supply amount is not greater than the minimum minute flow rate, an oil supply abnormality signal is output (STEP
33), this causes the alarm 13f to output a buzzer sound.

Next, the MPU 15 determines whether or not a descending signal is input from the elevation switch 11 (STE
P34). In this state, when the refueling worker operates the lift switch 11 to raise, the lift switch 11 will release MP.
A rising signal is supplied to U15, which causes MPU15 to
determines that there is a rising signal input, and performs the above STEP.
33, the output of the refueling abnormality signal that continues to be output is stopped (STEP 35), and as a result, the output of the buzzer sound from the alarm 13f is stopped. After that, MPU15
performs the processing from STEP 17 onwards.

The operation of the suspension type oil supply system of this embodiment constructed as described above will be explained below.

First, the refueling operator lowers the lift switch 11 to lower the refueling nozzle 5 from the standby position A to the refueling position B. Then, the user operates the preset setting device 12 to set the desired amount of refueling or the amount of refueling as the preset value P. Here, in order to make the operation easier to understand, let us assume that the preset oil supply this time is 20.00 liters.

(When the oil supply device is normal)

When the refueling worker inserts the discharge pipe of the refueling nozzle 5 into the refueling port of the vehicle to be refueled and starts refueling, the refueling amount indicator 13a
The current fuel amount and fuel amount are displayed on the fuel amount display 13b. At this time, the MPU 15 subtracts the actually refueled amount Q1 from the preset value P of 20.00 liters, and compares whether this subtracted value is equal to a predetermined value K, for example, 0.20 liters. are doing. Then, when the above-mentioned subtraction value becomes equal to 0.20 liters, the pump motor 7 is deenergized, and
The amount of refueling Q119.80 liters at this point is stored and time measurement is started.

Here, even after the pump motor 7 is deenergized, an overflow amount occurs due to the inertia of the pump motor 7, the pump 8, and the liquid flow.

Assume that, for example, an overflow amount of 0.20 liters occurs between the start of time measurement and the time the time measurement reaches the overflow time, and the current refueling amount Q2 becomes 20.00 liters. Then, it is determined whether the overflow amount of 0.20 liters is greater than or equal to a predetermined value L. Here, the predetermined value L is 0.09
liter, the overflow amount of 0.20 liters is greater than the predetermined value L, and the current refueling amount Q2 has reached the preset value P of 20.00 liters, so refueling ends.

Further, assume that, for example, an overflow amount of 0.10 liters occurs between the start of time measurement and the time the time measurement reaches the overflow time, and the current refueling amount Q2 becomes 19.90 liters. Then, it is determined whether the overflow amount of 0.10 liters is greater than or equal to a predetermined value L. Here, the predetermined value L is 0
．． 09 liters, the passing amount of 0.20 liters is greater than the predetermined value L, so the preset value P 2
Current oil supply amount Q2 from 0.00 liters 19.90
liters is subtracted to obtain the additional oil supply amount of 0.10 liters, and the inching data storage section 18 of the data memory 18 is stored in advance.
From the maximum minute flow rates q1 to qn stored in b, select the maximum minute flow rate qm 0.10 liters corresponding to the above additional oil supply amount of 0.10 liters, and read out the corresponding minimum energization time tm, for example, 90 msec. At the same time, the current refueling amount Q2 of 19.90 liters is updated and stored as the refueling amount Q1. And pump motor 7
is energized, and timing is started, and when this timing reaches the minimum energization time tm of 90 msec, the pump motor 7 is deenergized, and further, when this timing reaches the pump rotation time, for example, 120 msec, timing starts. is reset. Here, even after the pump motor 7 is deenergized, the oil liquid is discharged from the oil supply nozzle 5 due to the inertia of the pump motor 7, the pump 8, and the liquid flow.

[0047] From the start of time measurement until the time measurement reaches the pump rotation time of 120 msec, the actual time is 0.10 msec.
Additional refueling amount of liters occurs and current refueling amount Q2 becomes 2
Suppose it becomes 0.00 liters. Then, the timer is reset and it is determined whether the additional oil supply amount of 0.10 liters is equal to or greater than the minimum minute flow rate. Here, if the minimum minute flow rate is 0.04 liters, then 0.
The additional oil supply amount of 10 liters is more than the minimum minute flow rate of 0.04 liters, and the current oil supply amount Q2 has reached the preset value P of 20.00 liters, so the refueling ends.

[0048] Also, after the time measurement starts and the time reaches the pump rotation time of 120 msec, the time actually becomes 0.
．． An additional amount of refueling of 05 liters has occurred and the current amount of refueling Q2
Suppose that it becomes 19.95 liters. Then, the timer is reset, and it is determined whether the additional oil supply amount of 0.05 liters is greater than or equal to the minimum minute flow rate. Here, if the minimum minute flow rate is 0.04 liters, the additional oil supply amount of 0.05 liters is more than the minimum minute flow rate, so in this case as well, the preset value P is changed to the current oil supply amount in the same way as the operation described above. Q219.95 liter is subtracted to obtain the additional oil supply amount of 0.05 liters, and the minimum energizing time tm corresponding to the above additional oil supply amount of 0.05 liters is obtained from the inching data storage section 18b of the data memory 18 in advance.
Read out this minimum energization time tm, for example 60mse
The pump motor 7 is energized by c, and the current oil supply amount Q2 1
9.95 liters to reach the preset value of 20.00 liters. Further, if the oil supply amount Q2 does not reach the preset value even after energizing the pump motor 7 for the above-mentioned 60 msec, the above-described operation is performed again. That is, "additional oiling amount is obtained by subtracting the current oiling amount Q2 from the preset value P 20.00 liters, and the minimum energizing time tm corresponding to the additional oiling amount is determined in advance from the inching data storage section 18b of the data memory 18.
At the same time, the current oil supply amount Q2 is changed to the oil supply amount Q.
1, the pump motor 7 is energized, time measurement is started, and this time measurement reaches the minimum energization time t.
When the time reaches m, the pump motor 7 is deenergized, and when this time reaches the pump rotation time, the time is reset and the operation is repeated.

When the refueling amount Q2 reaches the preset value P, the refueling operator looks at the refueling amount display 13a and determines whether refueling corresponding to the current preset value P of 20.00 liters has been completed. After confirming, close the main valve of the refueling nozzle 5, remove the discharge pipe from the refueling port, and operate the lift switch 11 to move the refueling nozzle 5 to the standby position B.
Return to At this time, the refueling amount of 20.00 liters set as the current preset value P is automatically cleared.

(When the oil supply device is abnormal)

When the refueling worker inserts the discharge pipe of the refueling nozzle 5 into the refueling port of the vehicle to be refueled and starts refueling, the refueling amount indicator 13a
The current fuel amount and fuel amount are displayed on the fuel amount display 13b. At this time, the MPU 15 subtracts the actually refueled amount Q1 from the preset value P of 20.00 liters, and compares whether this subtracted value is equal to a predetermined value K, for example, 0.20 liters. are doing. Then, when the above-mentioned subtraction value becomes equal to 0.20 liters, the pump motor 7 is deenergized, and
The amount of refueling Q119.80 liters at this point is stored and time measurement is started.

Here, even after the pump motor 7 is deenergized, an amount of overflow occurs due to the inertia of the pump motor 7, the pump 8, and the liquid flow.

Assume that, for example, an overflow amount of 0.07 liter occurs between the start of time measurement and the time the time measurement reaches the overflow time, and the current refueling amount Q2 becomes 19.87 liters. If the predetermined value L is 0.09 liters, then 0
．． Since the passing amount of 0.7 liters is not greater than the predetermined value L, the alarm 13f outputs a buzzer sound. This allows the refueling operator to know of any abnormalities in the suspended refueling system.

Further, assume that, for example, an overflow amount of 0.10 liters occurs between the start of time measurement and the time the time measurement reaches the overflow time, and the current refueling amount Q2 becomes 19.90 liters. Assuming that the predetermined value L is 0.09 liters, the passing amount of 0.10 liters is greater than the predetermined value L, so the alarm 13f does not output a buzzer sound. Then, the suspended refueling device adjusts to the preset value P20.
The current oil supply amount Q2 19.90 liters is subtracted from 00 liters to obtain the additional oil supply amount 0.10 liters, and the amount is selected from among the maximum minute flow rates q1 to qn stored in advance in the inching data storage section 18b of the data memory 18. Maximum minute flow rate q corresponding to the above additional oil supply amount of 0.10 liters
Select m0.10 liters, read out the corresponding minimum energizing time tm, for example, 90 msec, and update and store the current oil supply amount Q2 19.90 as the oil supply amount Q1. Then, as the pump motor 7 is energized, time measurement is started, and this time measurement is the minimum energization time tm 9
When the time reaches 0 msec, the pump motor 7 is deenergized,
Furthermore, this time measurement is the pump rotation time, for example 120 msec.
When this is reached, the clock is reset. Here, even after the pump motor 7 is deenergized, the oil liquid is discharged from the oil supply nozzle 5 due to the inertia of the pump motor 7, the pump 8, and the liquid flow.

[0055] From the start of time measurement until the time measurement reaches the pump rotation time of 120 msec, the time actually exceeds 0.02 msec.
Additional refueling amount of liters occurs and current refueling amount Q2 becomes 1
Let's say it's now 9.92 liters. Minimum microflow value is 0
．． 0.04 liters, the additional refueling amount of 0.02 liters is more than the minimum minute flow rate, so alarm 13 is activated.
A buzzer sound is output from f. This allows the refueling operator to know of any abnormalities in the suspended refueling system.

When a buzzer sound is output from the alarm 13f, the refueling worker closes the main valve of the refueling nozzle 5, removes the discharge pipe from the refueling port, and turns on the lift switch 11.
Return the refueling nozzle 5 to the standby position B by raising it. At this time, the refueling amount of 20.00 liters set as the current preset value P is automatically cleared.

[0057]

Effects of the Invention As described above, the first invention provides a system in which the smallest overflow amount is generated when the motor is de-energized while the pump is in steady operation due to the energization of the motor. A second storage means is provided in which a predetermined value is stored, and the actual displacement amount generated when the motor is de-energized while the pump is being operated steadily by the energization of the motor is stored in the second storage means. If the overflow amount is less than the minimum amount stored in the system, an abnormality in the metered liquid supply control device is detected, so it is necessary for the liquid supply operator to inspect the liquid supply device before it breaks down. It is possible to notify that

[0058] Furthermore, the second invention includes the minute energization time and the amount of flow that occurs when the motor is energized for a minute time when the pump is stopped and the fluid to be measured is not flowing, as the liquid feeding amount. A third storage means is provided in which a correspondence with a minimum minute flow rate among the minute flow rates is stored, and the actual additional oil supply amount performed by the second liquid supply control means is stored in the third storage means. If the flow rate is less than the minimum minute flow rate specified, an abnormality in the metered liquid supply control device is detected, so the liquid supply operator is required to inspect the liquid supply device before it breaks down. This can be reported.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a suspended oil supply device as an embodiment to which the present invention is applied.

FIG. 2 is a system configuration diagram of a control device 14 of the suspended oil supply device shown in FIG. 1. FIG.

FIG. 3 is a diagram showing data stored in an inching data storage section 18b.

FIG. 4 is a diagram showing data stored in the minimum flow value storage section 18c.

FIG. 5 is a flowchart showing a control configuration of the suspended oil supply device of FIG. 1;

[Explanation of symbols]

7 Pump motor 8 Pump 9 Flowmeter 10 Flow rate pulse transmitter 12 Preset setting device 13f Alarm 14 Control device 15 MPU 18a Overflow amount storage section 18b Inching data storage section 18c
Minimum flow value storage section

Claims (2)

[Claims] 1. A pump driven by a motor, a measuring means for measuring the flow rate of a fluid to be measured delivered by the pump, and a preset setting means for setting a desired amount of fluid to be supplied as a preset value in advance when supplying fluid. and a first storage means in which a maximum amount of overflow is stored as a predetermined value among the amount of overflow that occurs when the motor is de-energized while the pump is in steady operation due to the energization of the motor; a first supply that de-energizes the motor when the measuring means measures a flow rate corresponding to a value obtained by subtracting a predetermined value stored in the first storage means from a preset value set by the presetting means; A fixed amount liquid supply control device comprising liquid control means, wherein a minimum overflow amount is a predetermined value among the overflow amounts that occur when the motor is de-energized while the pump is in steady operation due to the energization of the motor. and an actual overflow amount generated when the motor is de-energized while the pump is in steady operation due to the energization of the motor are stored in the second storage means. 1. A metering liquid supply control device, comprising: abnormality detection means for detecting an abnormality in the metering liquid supply control device when the throughput amount is less than a minimum throughput amount. 2. A pump driven by a motor, a measuring means for measuring the flow rate of the measured fluid sent by the pump, and a preset setting means for setting a desired amount of fluid to be supplied as a preset value in advance when supplying fluid. and a first storage means in which a maximum amount of overflow is stored as a predetermined value among the amount of overflow that occurs when the motor is de-energized while the pump is in steady operation due to the energization of the motor; A minute flow rate that includes the amount of overflow that occurs when the motor is instantaneously energized when the pump is stopped and the fluid to be measured is not flowing, and the instantaneous activation of the motor to convey this minute flow rate. a second storage means in which a correspondence with the preset time is stored; first liquid supply control means for deenergizing the motor when measured by the measuring means;
The first liquid supply control means determines when the overflow amount that occurs when the motor is de-energized has completely flowed, calculates the difference between the fluid to be measured and the measured fluid measured by the preset means, and The instantaneous energizing time of the motor for feeding the corresponding minute flow rate is calculated based on the second storage means and set as the next motor energizing time, and the motor is energized for this set time. and a second liquid supply control means for driving the pump, and after the overflow amount based on the operation of the first liquid supply control means has completely flowed, the preset value and the measured value measured by the measurement means are In the quantitative liquid supply control device, the difference between the flow rate of the fluid and the measured fluid is supplied by the operation of the second liquid supply control means, and the liquid supply to the preset value is completed. a third storage means storing a correspondence with a minimum minute flow rate among the minute flow rates including the amount of overflow generated when the motor is energized for a minute time in a state of no flow; Abnormality detection that detects an abnormality in the quantitative liquid supply control device when the actual additional oil supply amount performed by the second liquid supply control means is smaller than the minimum minute flow rate stored in the third storage means. A quantitative liquid supply control device characterized by comprising: means.