JPH0356999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present application relates to a refueling device used at a refueling station for metering and supplying oil such as gasoline to a fuel tank of an automobile.

[Prior art]

At a gas station with a small site, the pump unit containing the flow meter and pump is placed in the corner of the site, and the lifting unit with the hose hanging down is placed above the refueling point, and both units are connected by an oil pipe. In addition to manual refueling stop operations, full refueling automatically ends refueling when the fuel tank is full, and preset refueling that automatically ends refueling when the refueling value reaches a preset value. Refueling devices that have an automatic stop function, such as "just refueling", have become popular, which automatically ends refueling when the next decimal point of the refueling value reaches exactly zero (all values below the decimal point) by performing a warning operation during refueling. In order to prevent overflow or improve stopping accuracy when these automatic stops are performed, the oil flow rate is automatically reduced to a small flow just before the oil supply is completely stopped.

[Problem that the invention seeks to solve]

As the small flow means mentioned above, in addition to control valves such as solenoid valves and motor valves that narrow the oil flow path, frequency converters that reduce the rotation speed of the pump motor are used, and all of them use electrical energy. For safety reasons, it is housed in an explosion-proof type case, so it is bulky, making it difficult to store it, and it is expensive, as well as requiring explosion-proof electrical wiring work for this small flow means. had.

[Configuration and action to solve problems]

This invention utilizes the power of an elevating motor that pays out and stores the hose, and allows the hose to move to a small stream by paying out the length of the hose at the time of refueling, and its basic configuration is as shown in (a) below. ing.

(a) A pump unit equipped with an oil supply pump and a flow meter, and a hose connected to this pump unit by an oil supply pipe, led out from a housing installed above the refueling point, and connected to a nozzle at the lower end. a lifting motor that raises and lowers the hose by feeding and storing it; a hose feeding length detector that detects the feeding length of the hose and outputs a hose feeding length signal; and a hose feeding length detector arranged near the downstream end of the oil pipe and connected to the lifting motor. and a valve mechanism provided with a valve drive mechanism that operates a built-in main valve in conjunction with the feeding and storing of the hose and opens the main valve when the feeding length of the hose is equal to the refueling length. When the hose lifting unit and the lifting motor drive circuit that drives the lifting motor are full, a small flow signal is output when the preset value or just before the value is reached, and the refueling is performed when the hose is full or until the preset value or just the value is reached. a stop signal generation circuit that outputs a stop signal when the difference between the preset value or the exact value and the prefilled oil value matches the inertia discharge value in the small flow, and the small flow signal is transmitted to the lifting motor drive circuit. to bias the lifting motor in the direction in which the hose is fed out.

(b) In addition to the configuration of the above (a), the first invention is provided with a pump motor drive circuit that drives a pump motor that rotates the pump, and a narrow passage that bypasses the main valve in the valve mechanism. A sub-flow path is provided, and a sub-valve that opens by the pressure of the pump is installed in the sub-flow path, and the main valve is closed when the length of the hose is extended beyond the refueling length. Then, when the small flow signal is generated, the elevating motor is moved so that the hose is extended further from the length during refueling, and the hose extension length detector detects that the hose has reached the extension length at which the main valve closes. The stop signal is applied to the pump motor drive circuit to stop the pump.

(c) In addition to the configuration of (a) above, the second invention further comprises installing a control valve for opening and closing the flow path in the pump unit, and providing a control valve drive circuit for driving the control valve, and providing the valve mechanism with the control valve for opening and closing the flow path. A sub-flow path which is a narrow path that bypasses the valve is provided, and a sub-valve that is opened by pump pressure is installed in this sub-flow path. The valve is closed, and when the small flow signal is generated, the elevating motor is moved in such a direction that the hose is extended further from the refueling length. The stop signal is applied to the control valve drive circuit to close the control valve.

(d) In addition to the configuration of (a) above, the third invention includes a pump motor drive circuit that drives a pump motor that rotates the pump, and when the length of the hose is extended beyond the length during refueling. The main valve is set to be in a half-closed state, and when the small flow signal is generated, the elevating motor is moved in such a direction that the hose payout length is further paid out from the refueling length, and the hose payout length detector indicates that the main valve is half closed. The system detects that the hose has reached the desired length, energizes the pump until it outputs a detection signal, and sends the stop signal to the pump motor drive circuit to stop the pump.

(e) In addition to the configuration of (a) above, the fourth invention is such that the pump unit is provided with a control valve that opens and closes the flow path and a control valve drive circuit that drives the control valve, and the length of the hose that is drawn out is The main valve is set to be in a semi-closed state when the hose is paid out beyond the refueling length, and when the small flow signal is generated, the lifting motor is moved to pay out the hose in a direction in which the hose payout length is further extended from the refueling length. The length detector detects that the main valve has reached the hose payout length that causes the main valve to be in a half-closed state, and is energized until it outputs a detection signal, and the stop signal is applied to the control valve drive circuit to close the control valve. It is designed to close the door.

〔Example〕

First of all, Nos. 1 to 4, and 7 based on the first and second inventions.
In the figure, 1 is a pump unit, which includes a pump 3 driven by a motor 2, a flow meter 4, and a flow meter 4 that indicates a unit oil volume (here, 1/100 liter).
A flow rate pulse generator 5 is housed therein, which outputs one flow rate pulse signal a every time the flow rate pulse signal a is measured.

Reference numeral 6 denotes a hose lifting unit installed on the ceiling 7. Inside the housing 8 is a drum 1 which is connected to the pump unit 1 through an oil supply pipe 9, around which a hose 11 is wound, with a fuel nozzle 10 connected to the lower end.
2, a lifting motor 13 that rotates the drum 12 in forward and reverse directions to feed out and store the hose, and a drum 1.
a hose feed-out length detector 14 that detects the feed-out length of the hose 11 from the rotation angle of 2 and outputs each feed-out length signal to be described later; and a sprocket 15 and a sprocket 16 that are integrated with the drum 12.
The cam 18 is fixed to the sprocket 19 to which the rotation of the lifting motor 13 is transmitted via the sprockets 15 and 16 and the chain 17, and the hose 1
The inlet 20 of the drum 12 to which the upstream end of the drum 1 is connected
a main valve 24 which is interposed between the main valve 24 and the downstream end of the oil feed pipe 9 and whose internal flow path 21 is urged in a direction to close the valve port 23 of the main flow path by hydraulic pressure and the elasticity of the spring 22; A narrow passage (sub-flow passage) 27 provided with a valve shaft 26 extending from the main valve 24 to the outside of the housing 25 and bypassing the valve port 23;
A valve mechanism 3 includes a sub-valve 29 that is biased in a direction to close the narrow passage 27 by a spring 28 whose strength is set to open when pump pressure is applied.
0 is stored.

31 is a roller provided at the tip of the valve shaft 26, and 32 is a peak of the cam 18, when the length of the hose 11 being fed out from the drum 12 (rotation angle of the drum 12) is the refueling length (refueling angle). Mountain part 32 of cam 18
is set to push the valve shaft 26 into the housing 25 through the rollers 31, displace the main valve 24 against the elasticity of the spring 22, and open the valve port 23.

33 is a protective roller for the hose 11 installed in the housing 8, and 34 is a stopper fixed to the hose 11 to restrict the maximum length of the hose 11 from the housing 8 so that it does not become longer than necessary.

35 is a lift control switch for the hose 11 provided near the nozzle 10, 36 is a refueling amount indicator, 37 is a preset keyboard, and 38 is a foam detection signal r or liquid level detection signal u when foam or liquid level is detected.
A foam level detection sensor is provided at the tip of the discharge pipe of the nozzle 10 for outputting the air, 39 is a control unit containing various electric circuits to be described later, and 40 is a control valve.

In FIG. 7, a counting circuit 41 counts the number of pulse signals a, and outputs a signal c, which is the output of the counted value, to the display 36 to be displayed as the amount of oil supplied, and also to the stop signal generating circuit 42.

43 is a memory circuit that stores the preset value inputted from the preset keyboard 37 and outputs the stored value as a signal d; 44 is a control signal generation circuit; ), when the lift control switch 35 is operated and the hose feeding signal e (one pulse) is output, the pump energizing signal f is outputted and applied to the pump motor drive circuit 45 to rotate and energize the pump motor 2. Lifting motor forward rotation signal g
(one pulse) is applied to the lifting motor drive circuit 46 to urge the lifting motor 13 to rotate forward. on the other hand,
When the nozzle 10 is at the lower limit position indicated by the two-dot chain line in FIG. 1, that is, at the refueling position, when the hose storage signal h (one pulse) is output, the pump energization signal f disappears and the lifting motor reversal signal i is output.
(one pulse) to energize the lifting motor 13 until the nozzle 10 rises to the refueling standby position. Furthermore, the control signal generation circuit 44 determines whether or not oil is being supplied (oil is being discharged) by measuring the interval of the pulse signal a based on the clock signal j output from the clock signal generation circuit 47. Even if the storage signal h is input by mistake during this refueling, this is ignored and the nozzle 10 is prevented from rising, ie, the output of the signal i is prevented.

Reference numeral 48 denotes a determination circuit, which is predetermined by an advance notice operation, that is, by a flow rate adjustment valve (not shown) of the nozzle 10, to automatically stop the oil supply when the oil supply value, that is, the value below the decimal point of the signal c, reaches exactly zero next time. It is determined from the input interval of the pulse signal a based on the clock signal j whether or not an operation to change the flow velocity in the specified pattern has been performed, and if the previous operation has been performed, a determination signal m (one pulse) is output. do.

49 is a control valve drive circuit that opens and closes the control valve 40. Note that the hose feed-out length detector 14 outputs a refueling standby length signal b 1 when the hose 11 is at the refueling standby length, and the main valve 24 outputs the refueling standby length signal b ₁ when the hose 11 is at the refueling length, as shown in FIG. When the valve port 23 is displaced as _shown in FIG _. The stop signal generating circuit 42 outputs a stop signal n (one pulse) or a stop signal s (one pulse) and a small flow signal t (one pulse) in response to the input of each signal described later.

Next, in addition to the common drawings 1 and 2, FIGS. 5, 6, and 8 based on the third and fourth inventions will be explained. For parts, components, and signals that are the same as those in the figures, the names and symbols described above will be used as they are, and detailed explanations will be omitted.

In FIGS. 5 and 6, the cam 51 fixed to the sprocket 19 is formed with a high mountain part 52 and a low mountain part 53 following it, and when the length of the hose 11 that is fed out is the refueling length, the high mountain part 52 is formed. contacts the roller 31 and pushes the shaft 26 of the valve mechanism 30' into the housing 25', causing the main valve 24 to be largely displaced and the valve port 23 to be wide open. From this state, the hose 11 is When the drum 12 is further rotated in the direction in which it is fed out, the cam 51 rotates accordingly, the roller 31 comes into contact with the low mountain part 53, and the valve port 23 is in a semi-closed state with a small opening.
When the drum 12 is further rotated and the roller 31 is removed from both the peaks 52 and 53, the main valve 24 completely closes the valve port 23.

In FIG. 8, the hose payout length detector 1
4 is the refueling standby length signal b ₁ and the refueling length signal output when the main valve 24 is in the state shown in Fig. 5.
In addition to b ₂ , when the valve port 23 is at the hose payout length where the valve port ₂₃ is in the semi-closed state as shown in FIG.
is biased in the direction in which the hose is fed out, the roller 31 comes off from both the peaks 52 and 53, and the main valve 24 outputs a main valve closing length signal _b5 when the hose is at the feeding length that completely closes the valve port 23. .

In the above configuration, the first invention will be explained below based on FIGS. 1, 2, 3, 4, and 7.

When a vehicle requesting refueling comes to the store, the customer first asks the customer for the desired amount (value) and inputs it from the preset keyboard 37. At this time, if the desired amount is 30 liters, this value is stored in the storage circuit 43, and a signal d indicating 30 liters is output. Thereafter, the operator operates the switch 35 to output the hose feed signal e. Then, the control signal generation circuit 44 outputs a return-to-zero signal p (one pulse) to return the previous oil supply value of the counting circuit 41 to zero, outputs a signal f to energize the pump motor 2 to rotate, and further outputs a forward rotation signal g. is applied to the lifting motor drive circuit 46. The drive circuit 46 receives the normal rotation signal g to urge the lifting motor 13 to rotate in the normal direction, thereby extending the hose 11 further from its length when it is on standby for refueling.

When the nozzle 10 attached to the lower end of the hose 11 descends to the refueling position, which is the lower limit position indicated by the two-dot chain line in FIG. The detector 14 outputs a refueling length signal _b2 , and in response to this, the lifting motor drive circuit 46 controls the lifting motor 1.
Deactivate 3.

At this point, the cam 18 is shown in FIG.
The peak portion 32 pushes the valve shaft 26 into the housing 25 against the elasticity of the spring 22 of the valve mechanism 30, and the main valve 24 opens the valve port 23 wide.

As the refueling operation progresses in this state, the value of the signal c, that is, the amount of refueling that is the count value of the counting circuit 41 approaches the value of the signal d, that is, 30 liters, and the difference between the two approaches a predetermined small difference value ( (Here, it is assumed to be 0.5 liters), the stop signal generation circuit 42 outputs a small flow signal t.

When the elevating motor drive circuit 46 receives the small flow signal t, it immediately energizes the elevating motor 13 to rotate in the normal direction, so that the hose 11 is further fed out and the drum is moved inside the housing 8 as shown by the two-dot chain line in FIG. 12, but this biased state is continued until the hose payout length detector 14 outputs the main valve closing length signal _b3 .

At the time when the main valve closing length signal _b3 is output, the main valve 24 has closed the valve port 23 as shown in Fig. 4, and since the pump 3 is still rotating at this time, the oil sent is The sub valve 29 resists the elasticity of 28.
is displaced and supplied to the nozzle 10 through the narrow passage 27.

In this state, that is, in a small flow state, the refueling operation progresses further, and if the value of signal c (refueling amount) and the value of signal d (30 liters) match, or they overrun from the preset value (30 liters). The difference between the values of both signals c and d is the value obtained by subtracting the discharge value due to the inertia of the pump in a small flow (the amount of oil discharged from the pump motor de-energization to the pump stop) from the value of the signal d. (assumed to be 0.05 liters), the stop signal generation circuit 42 outputs a stop signal n and supplies it to the pump motor drive circuit 45. The drive circuit 45 then de-energizes the pump motor 2 despite the presence of the signal f, thereby ending the preset oil supply for 30 liters.

Note that, at the same time as the pump pressure disappears, the sub-valve 29 closes the narrow passage 27 due to the elasticity of the spring 28. There is no risk that the water will run off due to drop or solar heat.

After this, the operator closes the flow rate regulating valve of the nozzle 10 and operates the switch 35 to output the storage signal h, and the control signal generation circuit 44 eliminates the pump energizing signal f by inputting the signal h. At the same time, a return-to-zero signal w (one pulse) is output to return the stored value of the memory circuit 43, that is, the current preset value, to zero, and a reversal signal i (one-pulse) is given to the lift motor drive circuit 46 to cause the lift motor 13 to return to zero.
is reversely energized, and this reverse energization is continued until the nozzle 10 rises to the refueling standby position and the hose feed-out length detector outputs the refueling standby length signal _b1 . At this time, the main valve 24 is temporarily displaced by the action of the cam 18 and the valve port 23 is opened, but since the flow rate adjustment valve of the nozzle 10 is already closed, there is a risk that oil will flow out from the nozzle 10. There isn't.

The above is a case where preset lubrication is carried out in the first invention, but when the nozzle operation for lubrication (changing the flow rate in a predetermined pattern) is performed during lubrication to exactly lubricate, the determination circuit The stop signal generation circuit 42 monitors the value of the signal c, that is, the amount of oil supplied, based on the judgment signal m output from the terminal 48, and after the judgment signal m is input, the stop signal generation circuit 42 generates a constant value with all values after the decimal point being zero. (assumed to be 0.5 liters) When it reaches the front, a small flow signal t is output and the lifting motor 1 is
3 is energized to rotate in the normal direction until the main valve closing length signal b ₃ is output from the hose feed-out length detector 14 to create a small flow, and the values after the decimal point in the value of signal c are all zero or just the value. On the other hand, as in the case of preset lubrication, when the lubrication progresses to a point just before the discharge value (0.05 liters) due to the inertia of the previous pump, a stop signal n is output and the pump motor 2 is deenergized.

On the other hand, during full refueling, when the fuel tank of the automobile is almost full and the foam level sensor 38 detects the rise of foam and outputs the foam detection signal r, the stop signal generation circuit 42 outputs the small flow signal t. Then, as in the case of preset oil supply, the lift motor 13 is energized to rotate forward, the valve port 23 is closed, and when the liquid level is detected and the liquid level detection signal u is output, the stop signal generation circuit 42 generates a stop signal. Output n and pump motor 2
It will deactivate the.

In the second invention, a control valve 40 is inserted into the oil flow path of the pump unit 1, and the oil supply is stopped by closing the control valve 40 instead of by deenergizing the pump motor 2 as in the first invention. The stop signal generation circuit 42 outputs a stop signal s instead of the stop signal n, and supplies it to the control valve drive circuit 49 to close the control valve 40. In this case, in the preset oil supply of the first invention, the "inertia discharge value of the pump 3" at the time of just oil supply shall be read as the "inertia discharge value due to the delay in closing the control valve 40."

Next, the third and fourth inventions will be explained based on Figures 1, 2, 5, 6, and 8. The liquid level sensor 38 detects the rise of bubbles in the fuel tank (not shown) as the refueling progresses to the preset value (30 liters) or just below the preset value (0.5 liters). A small flow signal t is output from the stop signal generation circuit 42 in response to the bubble detection signal r outputted at this time.
3 is the same up to the point where the hose 11 is urged to rotate normally in the direction in which the hose 11 is fed out.The explanation up to the generation of this small flow signal t will be omitted, and the third and fourth inventions will be described below as the preset in the third invention. Let's explain about refueling.

When the small flow signal t is output and the hose 11 is further fed out, the cam 51 moves from the position where the valve port 23 shown in FIG. 24 is in a half-closed state and the valve port 23 is rotated to a narrowed position, and the lifting motor ₁₃ continues to rotate normally until the main valve half-closed length signal b4 is output from the hose feed-out length detector 14. The energization continues.

When the main valve 24 is half-closed, oil is discharged from the nozzle 10 in a small stream regardless of the opening degree of the flow rate adjustment valve of the nozzle 10, and the value of the signal c (oil flow amount) is changed to the value of the signal d ( 30 liters), or the difference between the values of both signals c and d is determined by the value of signal d, which is the discharge amount due to the inertia of the pump in a small flow (discharged from the time when the pump motor is de-energized until the pump stops). When the stop signal generation circuit 42 matches the value obtained by subtracting the amount of oil (0.05 liters), the stop signal generation circuit 42 outputs a stop signal n (one pulse) and gives it to the pump motor drive circuit 45.
The drive circuit 45 then de-energizes the pump motor 2 despite the presence of the signal f, and as a result, the preset oil supply for 30 liters is completed.

At this time, the stop signal n is also given to the lifting motor drive circuit 46, and in response to this, the lifting motor driving circuit 46 moves the lifting motor 13 to the hose 11.
In the direction in which the cam 51 is further extended, that is, the cam 51
is urged so that it is rotated counterclockwise from the position shown in FIG.
3, the main valve 24 completely blocks the valve port 23,
This biased state is maintained until the main valve closing length signal _b5 is output from the hose payout length detector 14. By doing this, even if the flow rate regulating valve of the nozzle 10 remains open after the preset oil supply is completed, there is no possibility that the oil in the oil feed pipe 9 will flow out from the nozzle 10.

Thereafter, when the operator closes the flow rate regulating valve of the nozzle 10 and operates the lift control switch 35 to output the storage signal h, the control signal generation circuit 44 receives the pump energizing signal f by inputting this signal h. At the same time, a return-to-zero signal w (one pulse) is output to return the stored value of the memory circuit 43, that is, the current preset value, to zero, and a reversal signal i (one-pulse) is given to the lift motor drive circuit 46 to cause the lift motor 13 to return to zero. is reversely energized, and this reverse energization is continued until the nozzle 10 rises to the refueling standby position and the hose feed-out length detector 14 outputs the refueling standby length signal _b1 .

The above is the case of preset lubrication in the third invention, but even when the small flow signal t is output during lubrication, the lifting motor 13 is moved from the hose feed-out length detector to the main valve half-closed position in the same way as during preset lubrication. The forward rotation is energized until signal b ₄ is output to create a small flow, and the value of signal c (oil supply amount) after the decimal point is all zero (exact value) or the previous pump is Discharge value due to inertia (0.05
When the refueling has progressed to a point just before 1 minute, a stop signal n is output to de-energize the pump motor 2. At the same time, the lift motor 13 is urged to rotate forward in the direction in which the hose 11 is further fed out, and the valve port 23 is closed. This is the same as with preset lubrication.

On the other hand, in full refueling, when the fuel tank of the automobile is almost full and the foam level sensor 38 outputs the foam detection signal r, the stop signal generation circuit 42
outputs a small flow signal t, half-closes the valve port 23 as in the case of the preset lubrication and just lubrication, detects the liquid level, and outputs a stop signal n when the liquid level detection signal u is output. Then, the pump motor 2 is deenergized and the valve port 23 is closed.

In the fourth invention, a control valve 40 is inserted in the oil flow path of the pump unit 1, and the oil supply can be stopped by controlling the control valve 40 without depending on the deenergization of the pump motor 2 as in the third invention.
The stop signal generation circuit 42 outputs a stop signal s in place of the stop signal n and gives it to the control valve drive circuit 49, and at the same time as the control valve 40 is closed, the signal n is output. The lifting motor 13 is energized to rotate in the normal direction until the valve port 23 is closed. In this case, the previous preset lubrication,
The "inertial discharge value of the pump 3" at the time of refueling will be read as the "inertial discharge value due to the closing delay of the control valve 40."

In addition, in the first to fourth inventions, the valve drive mechanism for displacing the main valve 24 may adopt a link type in addition to the cam type in the embodiment of the present application.
In addition to being fixed to the hose 11 itself, the stopper 34 is provided with a hose clamping part on the housing 8 side that clamps the hose 11 and prevents it from being drawn out further from the housing 8. It is also possible to operate in conjunction with the length of the hose 11 being fed out, or in cases where there is no problem even if the length of the hose 11 drawn out from the housing 8 greatly exceeds the length during refueling, this hose 11 The stopper itself may not be provided.

〔effect〕

As detailed above, slightly before automatic refueling stops due to full refueling, preset refueling, or just refueling, small flow refueling is forced to occur in order to prevent overflow from the fuel tank due to a delay in stopping and to improve stopping accuracy. As a means of transferring to
There is no need to provide a new electrically driven valve device that is bulky, expensive, and requires explosion-proof construction, making it possible to provide an inexpensive oil supply device.

[Brief explanation of drawings]

Fig. 1 shows the arrangement of each refueling-related unit at a gas station, Fig. 2 shows the structure of the hose lifting unit, and Figs. 3 and 4 show the different operating states of the valve mechanism according to the first and second inventions. In the cross section, the 5th and 6th
The figures show different operating states of the valve mechanisms according to the third and fourth inventions in cross-section, respectively, and FIG. 7 shows the control section according to the first and second inventions, and FIG. 4 is a block diagram showing each control unit according to the invention. 1...Pump unit, 2...Pump motor, 5...Flow rate pulse transmitter, 9...Oil pipe, 1
0... Nozzle, 11... Hose, 12... Drum, 13... Hose lifting/lowering motor, 14... Hose feeding length detector, 18, 51... Cam, 2
4... Main valve, 30, 30'... Valve mechanism, 40...
Control valve, 29...auxiliary valve.

Claims (1)

[Scope of Claims] 1. A pump unit including an oil feeding pump, a pump motor for driving the same, a flow meter, and a flow rate pulse transmitter that outputs a number of pulse signals corresponding to the amount of oil measured by the flow meter. A hose is connected to this pump unit by an oil supply pipe, and is led out from a housing installed above the refueling point and has a nozzle connected to its lower end, an elevating motor and an oil supply pipe that raise and lower the hose by feeding it out and storing it. is located near the downstream end of the hose and is driven by the lifting motor, and operates a built-in main valve in conjunction with the feeding and storage of the hose, so that the main valve is opened when the feeding length of the hose is equal to the refueling length. Furthermore, a valve drive mechanism that closes the main valve when the hose is fed out, a valve mechanism that includes a sub-valve that is opened by pump pressure in a sub-channel that is a narrow path that bypasses the main valve, and a hose that closes the main valve. A hose lifting/lowering unit having a hose feed-out length detector that outputs a main valve closing length signal when the length is reached, and a small flow signal that outputs a small flow signal when the hose is full, a preset value, or just short of the value. Or, a stop signal generation circuit that outputs a stop signal when refueling is performed to a preset value or exactly value, or when the difference between the preset value or exactly value and the already supplied oil value matches the pump inertia discharge value in a small flow. A lifting motor drive circuit that, upon receiving the generation of the small flow signal, urges the lifting motor in the direction in which the hose is fed out until the main valve closing length signal is output; A refueling device characterized by comprising a control unit including a pump motor drive circuit that stops the motor. 2. An oil feed pump, a pump motor that drives the oil feed pump, a flow meter, a flow pulse transmitter that outputs a number of pulse signals corresponding to the amount of oil measured by the flow meter, and a control valve that opens and closes the flow path in the oil feed pipe. A pump unit equipped with the pump unit, a hose connected to the pump unit by an oil supply pipe and led out from a housing installed above the refueling point and connected to a nozzle at the lower end, and the hose is let out and stored to raise and lower the pump. The lift motor is located near the downstream end of the oil pipe, and is driven by the lift motor, and operates the built-in main valve in conjunction with the hose being fed out and stored. A valve driving mechanism that opens the valve and closes the main valve when the hose is further fed out; a valve mechanism that includes a sub-valve that is opened by pump pressure in a sub-flow path that is a narrow path that bypasses the main valve; and the main valve. a hose lifting/lowering unit having a hose feed-out length detector that outputs a main valve closing length signal when the main valve reaches a hose feed-out length that closes; and a hose lift/lower unit that outputs a small flow signal when the main valve is full, a preset value, or just short of the value; Outputs a stop signal when the preset value or exact value is reached, or when the difference between the preset value or exact value and the already filled oil value matches the control valve inertia discharge value in a small flow. a stop signal generation circuit; a lifting motor drive circuit that urges the lifting motor in the direction in which the hose is fed out until the main valve closing length signal is output when the small flow signal is generated; and the generation of the stop signal; 1. A refueling device comprising: a control unit including a control valve drive circuit that closes the control valve in response to a pump motor, and a pump motor drive circuit that controls the pump motor. 3. A pump unit that includes an oil feeding pump, a pump motor that drives the pump, a flow meter, and a flow pulse transmitter that outputs a number of pulse signals corresponding to the amount of oil measured by the flow meter; A hose that is connected by an oil pipe and led out from a housing installed above the refueling point and has a nozzle connected to its lower end, a lifting motor that raises and lowers the hose by feeding it out and storing it, and is located near the downstream end of the oil supply pipe. It is driven by the lifting motor and operates the built-in main valve in conjunction with the feeding and storage of the hose, and when the hose feeding length is at the refueling length, the main valve is opened and when the hose is fed out further. A hose lifting unit having a valve drive mechanism that partially closes the main valve, and a hose feed-out length detector that outputs a main valve half-closed length signal when the main valve reaches a hose feed-out length that causes the main valve to be half-closed; When the oil is full, a small flow signal is output just before the preset value or the exact value, or when the oil is filled up to the preset value or the exact value, or the difference between the preset value or the exact value and the already filled value is a small flow signal. A stop signal generation circuit outputs a stop signal when the pump inertia discharge value matches the pump inertia discharge value, and when the small flow signal is generated, the lifting motor is operated until the hose is What is claimed is: 1. A refueling device comprising: a control unit including a lift motor drive circuit that biases the pump motor in a direction in which the pump is fed; and a pump motor drive circuit that stops the pump motor in response to generation of the stop signal. 4. A pump unit that includes an oil feeding pump, a pump motor that drives the oil feeding pump, a flow meter, a number of pulse transmitters corresponding to the amount of oil measured by the flow meter, and a control valve that opens and closes a flow path in the oil feeding pipe; This pump unit is connected to the pump unit by an oil supply pipe, and is led out from a housing installed above the refueling point and has a nozzle connected to its lower end, a lifting motor that raises and lowers the pump unit by letting out and storing this hose, and an oil supply pipe. It is located near the downstream end and is driven by the lifting motor, and operates the built-in main valve in conjunction with the hose being fed out and stored. When the hose is fed out to the refueling length, the main valve is opened and the hose is moved further. A hose having a valve drive mechanism that partially closes the main valve when the hose is fed out, and a hose feed-out length detector that outputs a main valve half-closed length signal when the hose feed-out length reaches a hose feed-out length that causes the main valve to be partially closed. The lift unit outputs a small flow signal when the oil is filled, the preset value or just before the oil value is filled, or when the oil has been refilled to the preset value or the oil value, or when the preset value or the oil value is exactly equal to the oil value already filled. A stop signal generation circuit that outputs a stop signal when the difference matches the control valve inertia discharge value in a small flow, and a stop signal generation circuit that outputs a stop signal when the difference matches the control valve inertia discharge value in a small flow; Control including a lift motor drive circuit that urges a motor in a direction in which the hose is paid out, a control valve drive circuit that closes the control valve in response to generation of the stop signal, and a pump motor drive circuit that controls the pump motor. A refueling device characterized by being equipped with a unit.