JP2000079999A - Oil feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect, in a simple structure, foam and a liquid level correctly when oil is fed until a tank is filled up. SOLUTION: An oil feed nozzle 13 is provided with a valve which opens by the operation of a nozzle lever 13, and a nozzle main body 13b incorporates a pressure sensor 18 which detects negative pressure generated according to a quantity of the flow of fed liquid oil. The pressure sensor 18 monitors a change in negative pressure generated due to flow velocity during the oil feed, which change occurs according to a change in quantity of the supply of air with a rise in liquid level. And based on an output level from a pressure sensor 18, foam detection and liquid-level detection can correctly be judged. A control circuit 25 monitors the output of the pressure sensor 18 and judges the foam detection and the liquid-level detection from its output level, also selectively controls the opening/closing of the first-stage valve 28 and second-stage valve 29 of a two-stage valve-closing mechanism 27 according to the judgment results, thereby controlling the quantity of oil supplied to the oil feed nozzle 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling device, and more particularly to a refueling device configured to detect a liquid level in a fuel tank to be refueled and automatically stop refueling.

[0002]

2. Description of the Related Art As a conventional lubricating device, there is, for example, a device disclosed in Japanese Utility Model Laid-Open Publication No. 62-1999. In the refueling device described in this publication, when the refueling nozzle is removed from the nozzle hook, the nozzle switch is turned on, the refueling pump is started, and the nozzle lever is opened in a state where the refueling nozzle is inserted into the refueling port of the fuel tank. The valve is operated and refueling is started. A negative pressure generating section for generating a negative pressure by the flow rate of the oil liquid is provided inside the oil supply nozzle, and air is introduced into the diaphragm chamber communicated with the negative pressure generating section from the tip of the discharge pipe. . Then, when the end of the discharge pipe is closed due to the rise in the liquid level in the fuel tank, the atmospheric pressure supply to the diaphragm chamber is lost and the pressure becomes negative,
The diaphragm operates to close the main valve of the fueling nozzle.

[0003] However, when bubbles are generated when the supplied oil liquid collides with the liquid surface or the like, and the tip of the discharge pipe inserted into the oil supply port is covered with the bubbles, before the liquid level is detected. Since the supply of the atmospheric pressure to the diaphragm chamber is lost and the refueling is interrupted, a bubble detection sensor for detecting a bubble by detecting the displacement of the diaphragm is provided. When a predetermined number of detections are made by the bubble detection sensor, it is determined that the full tank refueling has been completed, and the refueling pump is stopped.

Further, there is also a configuration in which a sensor for detecting a liquid level is provided at an opening of a tip end of a discharge pipe of a refueling nozzle to detect a liquid level to prevent malfunction due to generation of bubbles.

[0005]

However, the conventional lubricating apparatus requires a diaphragm, a bubble detecting sensor for detecting bubbles from the displacement of the diaphragm, a liquid level detecting sensor, and the like in order to detect the bubbles and the liquid level. Therefore, there is a problem that the configuration becomes complicated and the assembling work is troublesome and the manufacturing cost is high.

[0006] Therefore, an object of the present invention is to provide a refueling device that solves the above-mentioned problems.

[0007]

In order to solve the above problems, the present invention has the following features. The present invention is directed to a negative pressure generating unit that generates a negative pressure according to a flow rate while discharging an oil liquid by a rotation operation of a nozzle lever, and a negative pressure that communicates with the negative pressure generating unit and has an opening near a discharge port. A refueling nozzle having a passage, a sensor provided in the negative pressure passage for detecting a pressure change in the negative pressure passage, and monitoring the output of the sensor, and the output level reaches a preset value. And a refueling amount control means for controlling a refueling amount supplied to the refueling nozzle in accordance with a result of the determination by the determining means.

Therefore, according to the present invention, the output of the sensor for detecting the pressure change generated in the negative pressure generating section is monitored to control the amount of oil supplied to the oil supply nozzle in accordance with the result of the determination of the output level. In addition, it is possible to accurately detect the liquid level of the refueling port and bubbles generated on the liquid level, and to simplify the configuration of the refueling nozzle to increase the assembly work efficiency.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a fuel supply apparatus according to an embodiment of the present invention; FIG. 1 is a configuration diagram of one embodiment of a fuel supply device according to the present invention. As shown in FIG. 1, the refueling device 11 is installed at a refueling site of a gas station, and a refueling hose 15 connected to a refueling nozzle 13 is drawn out from a side surface of the device body 12. The refueling nozzle 13 is usually
For example, when a customer's car arrives at a gas station, an operator removes the fueling nozzle 13 from the nozzle hook 14 and refuels the fuel tank 16 of the vehicle's fuel tank 16. 16a to refuel.

The refueling nozzle 13 is provided with a valve which is opened by operating a nozzle lever 13a, and the nozzle body 13b has a built-in pressure sensor 18 for detecting a negative pressure generated according to the flow rate of refueling oil liquid. ing. This pressure sensor 1
8 monitors a state in which the negative pressure generated by the flow rate at the time of refueling fluctuates according to a change in the air supply amount due to a rise in the liquid level, as will be described later. The liquid level detection can be reliably determined.

For this reason, inside the refueling nozzle 13, a diaphragm for detecting a negative pressure generated by a flow rate at the time of refueling, a sensor for detecting displacement of the diaphragm, and an ultrasonic sensor for detecting a liquid level are provided at the tip of the discharge pipe 17. Need not be provided, and the configuration can be simplified accordingly.
Therefore, in the refueling nozzle 13, the liquid level of the refueling port can be accurately detected, and the configuration of the refueling nozzle 13 can be simplified to increase the assembly work efficiency.

The refueling nozzle 13 includes a nozzle body 13.
The oil supply hose 15 is connected to a joint provided on the side surface of b. In the apparatus main body 12, the oil supply hose 15 is connected to a liquid feed pipe 20. The liquid feed line 20 extends and is inserted to the underground tank 21, and a pump 22, a flow meter 24, and a two-stage valve closing mechanism 27 are provided in the middle thereof.

The two-stage valve closing mechanism 27 includes a large-diameter one-stage valve 28 for opening and closing the liquid supply line 20, a bypass line 20a branched from the liquid supply line 20 and bypassing the one-stage valve 28,
Two-stage valve 29 for opening and closing small-diameter bypass line 20a
Consists of In the two-stage valve closing mechanism 27, both the first-stage valve 28 and the two-stage valve 29 are opened at the time of starting the preset refueling, and when the refueling amount reaches the value immediately before the preset value,
First, the first-stage valve 28 is closed, and when the refueling amount reaches a preset value, the second-stage valve 29 is also closed.

The two-stage valve closing mechanism 27 controls the opening and closing timings of the first-stage valve 28 and the two-stage valve 29 as described later. Further, on the front face of the apparatus main body 12, a refueling amount display 26 for displaying a refueling amount obtained by integrating the instantaneous flow rate measured by the flow meter 24 is provided. Then, the nozzle switch 1 of the nozzle hook 14
4a, the pump motor 22a of the pump 22, the flow pulse transmitter 24a of the flow meter 24, and the oil supply amount display 26 are connected to the control circuit 25.

When the oil supply nozzle 13 is removed from the nozzle hook 14 and a signal from the nozzle switch 14a is input, the control circuit 25 starts the pump motor 22a of the pump 22 to pump up the oil liquid in the underground tank 21. . When the nozzle lever 13a of the refueling nozzle 13 is operated, refueling of the fuel tank 16 is started, and a flow pulse is output from the flow pulse transmitter 24a of the flow meter 24 to the control circuit 25.

Then, the control circuit 25 integrates the flow rate pulses output from the flow rate pulse transmitter 24a, and causes the refueling quantity display 26 to display the refueling quantity. Also, the control circuit 25
Performs a full tank refueling control or a preset refueling control as described later. FIG. 2 is a block diagram of the control circuit 25. As shown in FIG. 2, the control circuit 25 inputs and outputs signals to and from a CPU 30 that executes a refueling control process described later, a RAM 31 that stores data, a ROM 32 that stores a preset refueling control program. And an I / O interface 33. The RAM 31 maintains a stored state by power supply from the battery 34. The I / O interface 33 includes a nozzle switch 14a of the nozzle hook 14, a flow pulse transmitter 24a of the flow meter 24, a display 26, a one-stage valve 28, and a two-stage valve 29.
And the preset switch 35 are connected.

Further, the I / O interface 33 includes:
A pressure sensor 18 is connected via an A / D converter 19. Therefore, when the pressure sensor 18 detects a pressure change caused by the end of the discharge pipe 17 of the refueling nozzle 13 being closed by bubbles and the liquid level during refueling, the detection signal is A
Is converted to a digital signal by the I / O converter 19
The data is input to the interface 33.

In this embodiment, the ROM 32 has a judgment control program as judgment means for monitoring the output of the pressure sensor 18 to be described later and judging the output level.
A refueling amount control program as refueling amount control means for controlling the refueling amount supplied to the refueling nozzle 13 according to the determination result is stored. Therefore, the control circuit 25 monitors the output of the pressure sensor 18 in the full tank refueling mode to determine the bubble detection and the liquid level detection from the output level, and determines the one-stage of the two-stage valve closing mechanism 27 according to the determination result. Valve 28 and two-stage valve 29
Are selectively opened and closed to control the amount of refueling supplied to the refueling nozzle 13.

The preset switch 35 is provided, for example, in the vicinity of the nozzle hook 14, and is operated only when performing preset refueling. Therefore, if the preset value is input by operating the preset switch 35 before starting refueling, the preset refueling mode is set. here,
The configuration of the refueling nozzle 13 will be described.

FIG. 3 is a longitudinal sectional view of the fuel supply nozzle 13.
FIG. 4 is a cross-sectional view of the refueling nozzle 13. Also,
FIG. 5 is an enlarged longitudinal sectional view showing the valve mechanism of the refueling nozzle 13. FIG. 6 is an enlarged cross-sectional view showing a valve mechanism of the refueling nozzle 13. As shown in FIGS. 3 to 6, the refueling nozzle 13 is a pistol-type refueling nozzle in which a grip 42 gripped during a refueling operation is provided at a rear portion of the nozzle body 13b. The nozzle body 13b has an inflow port 13c on the left side of which the hose joint 44a is rotatably fitted.

An elbow 44b is rotatably connected to the hose joint 44a. A hose joint 44c is rotatably connected to the elbow 44b.
Is connected to a refueling hose 28. Nozzle body 13
A valve seat member 45 of the main valve and a pipe connecting member 47 to which the discharge pipe 17 is connected are inserted into the opening on the distal end side of a, and both members are held by tightening a nut 48. The oil passage 49 formed in the pipe connecting member 47 and the valve mechanism 43 including the negative pressure generating section 50 and the main valve body 51 are accommodated in the oil passage 49.

The refueling nozzle 13 has a nozzle lever 13a rotatably provided in front of a grip 42, and the grip 42 has a lever guard 42b on the front side around the nozzle lever 13a. And the nozzle lever 13a is
The main valve body 51 is inserted through an engagement hole 60a of a valve shaft 60 that drives the valve mechanism 43 to open and close, and is rotated in the C direction.
Can be moved in the valve opening direction. The nozzle lever 13b is formed in the same shape as a pistol trigger, and has an upper end rotatably supported by a shaft 46.

When performing the refueling operation, when the grip portion 42a of the grip 42 is gripped and the nozzle lever 13a is pulled in the direction C, the valve shaft 60 slides in the direction B and the main valve body 51 of the valve mechanism 43 is moved.
Is separated from the valve seat member 45 and opens. Thereby, refueling is started. When the lower end of the nozzle lever 13a is hooked on a hook (not shown) of the lever guard 42b, the valve shaft 60 and the main valve body 51 are locked at the fully open position, and the tank is fully refueled.

The negative pressure generating section 50 is provided inside the valve seat member 45 and generates a negative pressure in accordance with the discharge amount of the oil liquid. The negative pressure generating section 50 opens on the tapered inner wall of the oil flow path 49. Open the negative pressure passage 56 separated from the passage 56 and the inner wall during refueling,
The valve body 57 of the automatic valve that closes the opening of the negative pressure passage 56 by contacting the inner wall by the pressing force of the coil spring 55 when the refueling is stopped.
And

The valve body 57 is in contact with the inner wall and
9 has a tapered abutting portion, and is slidably inserted into a central hole formed in the pipe connecting member 47. Further, an air suction pipe 53 is inserted into the internal passage 17 a of the discharge pipe 17. One end of the air suction pipe 53 is connected to an air introduction hole 52 provided at the tip of the discharge pipe 17.
The other end of the air suction pipe 53 is inserted into a downstream central hole 59 formed in the pipe connection member 47.

The air introduction hole 52 functions as a liquid level detecting unit when the tank is full, and sucks air by the negative pressure generated by the negative pressure generating unit 50. And the air introduction hole 5
The air sucked from 2 passes through the suction pipe 53 and passes through the central hole 5.
9 and is supplied to an annular passage 55 formed on the outer periphery of the valve seat member 45 and the pipe connection member 47. The other end of the passage 54 connected to the oil passage 49 is connected to the annular passage 55.

When the nozzle lever 13a of the refueling nozzle 13 is C
When the valve mechanism 43 is opened by operating in the direction, the valve body 57 is pressed in the direction A by the fluid pressure to open the valve and start refueling. Thus, the oil liquid is discharged to the discharge pipe 17 through the oil flow path 49. At that time, in the negative pressure generating section 50, a Venturi effect, that is, a negative pressure corresponding to the flow rate of the oil liquid is generated, and the air in the negative pressure passage 56 opening on the inner wall of the oil flow path 49 Is sucked. When refueling is stopped, the valve mechanism 43 is closed, and the valve body 57 is
, The negative pressure disappears, and the suction of air from the passage 54 also stops.

The valve shaft 60 is slidably supported in the A and B directions by a bearing 63 provided in the nozzle body 13a, and the main valve body 51 is valved by the spring force of the coil springs 64 and 65. It is pressed against the seat member 45. When the nozzle lever 13a is rotated in the direction C, the main valve body 5
The valve shaft 60 integral with 1 is displaced in the valve opening direction (B direction). Thereby, the refueling nozzle 1 is connected via the refueling hose 15.
The oil liquid sent to 3 passes through an oil flow path 49 and is supplied from a discharge pipe 17 to an oil supply port 16 a of a fuel tank 16.

The suction pipe 53 inserted into the discharge pipe 17 has a central hole 59 and passages 54, 5 formed in the pipe connecting member 47 in the nozzle body 13b during refueling.
5, and is communicated with a negative pressure generating section 50 provided on the downstream side of the valve mechanism 43. When the valve mechanism 43 opens and the oil liquid flows from the oil flow path 49 into the oil flow path 17 a in the discharge pipe 17, the negative pressure is reduced due to the venturi effect of the negative pressure generating unit 50 with the outflow of the oil liquid. Then, the air in the negative pressure passage 56 is sucked into the oil passage 49.

In FIGS. 4 and 6, reference numeral 66 denotes a liquid level detecting section for detecting the liquid level when the tank is full. The liquid level detection unit 66 includes a pressure detection chamber 67 to which the negative pressure passage 62 is communicated,
The pressure sensor 18 includes a pressure sensor 18 attached to the pressure detection chamber 67 and a lid 68 for closing the pressure detection chamber 67. The pressure detection chamber 67 is connected to the negative pressure generator 5 through the passages 62 and 55 and 65.
The oil passage 49 communicates with the suction pipe 53 via the passages 62, 55, and 54. At the time of refueling, the negative pressure generated in negative pressure generating section 50 is applied to passages 65 and 5.
It is introduced into the suction tube 53 through the ports 5 and 54. Therefore, the air introduction hole 52 provided at the tip of the discharge pipe 17
Is sucked from the suction pipe 53 and the passages 54 and 5.
5,62.

Accordingly, the pressure in the pressure detecting chamber 67 is constant during refueling, and the air introduction hole 52 provided at the end of the discharge pipe 17 is closed by the liquid level, so that the supply of air from the suction pipe 53 is stopped. Does not change until. At this time, the pressure sensor 18 provided in the pressure detection chamber 67 detects a negative pressure corresponding to the flow velocity, and outputs a signal corresponding to the pressure.

Here, when the air introduction hole 52 at the tip of the discharge pipe 17 is closed by the liquid surface of the oil supply port 16a, the suction of air from the air introduction hole 52 is shut off, and the liquid level is detected. That is, the supply of air from the suction pipe 53 to the negative pressure generating unit 50 is stopped, and the air in the pressure detection chamber 67 is sucked into the negative pressure generating unit 50 via the passages 62, 55, and 56.

As a result, the air pressure in the pressure detection chamber 67 is reduced. Thereby, the pressure sensor 18 is connected to the negative pressure generator 5.
The negative pressure (pressure change) generated at 0 is detected as a negative pressure, and a detection signal is output. When a negative pressure is detected by the pressure sensor 18 as described later, the control circuit 25 closes the first-stage valve 28 and the second-stage valve 29 of the two-stage valve closing mechanism 27 to stop refueling.

FIG. 7 is a graph showing an example of a change in pressure due to bubble detection, liquid level detection, and opening and closing operations of the first-stage valve 28 and the second-stage valve 29 at the time of refueling. As shown in FIG. 7, at the start of refueling, a two-step operation (only the two-stage valve 29 for small flow rate is opened) is executed to refuel at a small flow rate. Therefore, a negative pressure corresponding to the flow velocity is generated in the negative pressure generating unit 50. At this time, the air (atmospheric pressure) sucked from the suction pipe 53 inserted into the discharge pipe 17 is introduced into the pressure detection chamber 67 in which the pressure sensor 18 is provided.

When one liter of oil is supplied, a one-step operation (the first-stage valve 28 for large flow rate is also opened) is performed to supply oil at a large flow rate. As a result, the flow velocity of the oil liquid passing through the negative pressure generating section 50 is increased, and the negative pressure also changes in the negative direction. Next, when refueling into the fuel tank 16 is performed, the liquid level gradually rises, and
to a. Eventually, the foam generated on the liquid surface is
7, the air introduction hole 52 at the tip of the discharge pipe 17 is closed by bubbles. Therefore, the amount of air supplied from the air introduction hole 52 decreases, and the pressure in the pressure detection chamber 67 gradually decreases. When the tip of the discharge pipe 17 is immersed in the foam, the foam bursts and the air supply amount from the air introduction hole 52 fluctuates, so that the pressure in the pressure detection chamber 67 also pulsates.

At this time, when the detection signal output from the pressure sensor 18 becomes equal to or less than a predetermined threshold value 1 (bubble detection), the three-stage operation (the first-stage valve 28 and the second-stage valve 29 are closed) is performed. Execute. Thus, the pressure in the pressure detection chamber 67 returns to the atmospheric pressure. Next, when additional refueling is performed, a two-stage operation (only the two-stage valve 29 is opened) is performed to perform additional refueling at a small flow rate. At the time of this additional refueling, the tip of the discharge pipe 17 is initially separated from the liquid level, but the rise of the liquid level causes the air introduction hole 52 at the tip of the discharge pipe 17 to be closed again by bubbles and the liquid level. When the distal end of the discharge pipe 17 is immersed in the liquid, the supply of air from the air introduction hole 52 is stopped, and the negative pressure generated in the negative pressure generator 50 is introduced into the pressure detection chamber 67.

As a result, the detection signal output from the pressure sensor 18 becomes equal to or less than the predetermined threshold value 2 (liquid level detection), and the three-stage operation (the first-stage valve 28 and the second-stage valve 29 are closed) is performed. Execute. Thereby, the full tank refueling is completed.
As described above, the control circuit 25 can accurately perform the determination processing of the bubble detection and the liquid level detection by comparing the output level of the pressure sensor 18 with the threshold value 1 or the threshold value 2.

Here, the control process at the time of refueling executed by the control circuit 25 will be described with reference to the flowcharts of FIGS. In FIG. 8, when the refueling nozzle 13 is removed from the nozzle hook 14 and the nozzle switch 14 a is turned on in step S <b> 11 (hereinafter “step” is omitted), the control circuit 25 proceeds to S <b> 12 and refuels the display 26. Set the volume display to zero. Subsequently, in step S13, the pump 22
Is started to pump up the oil liquid in the underground tank 21.

In the next step S14, the two-stage valve 39 for the small flow rate of the valve mechanism 37 is opened (two-stage operation: see FIG. 7). This makes it possible to refuel at a small flow rate. Subsequently, in S15, it is checked whether or not to perform preset refueling. When a preset value is input by the preset switch 45, the preset refueling mode is set. In that case, S
Proceeding to 16, a preset refueling process is executed.

However, in S15, when the preset switch 45 is not operated, the full fueling mode is set. Here, the refueling operator inserts the discharge pipe 17 of the refueling nozzle 13 into the refueling port 16 a of the fuel tank 16,
The nozzle lever 13a of the refueling nozzle 13 is opened.
As a result, in the refueling nozzle 13, the main valve body 51 and the valve shaft 60 of the valve mechanism 43 move in the valve opening direction (B direction), and the valve of the automatic valve is moved by the hydraulic pressure of the oil liquid sent by the pump 22. The fuel is supplied to the fuel tank 16 by opening the body 57. Therefore, the oil liquid supplied at a small flow rate via the two-stage valve 39 is supplied to the fuel tank 16 in a state where the oil liquid is prevented from rebounding at the fuel supply port 16a.

At S17, the integrated flow rate Q measured by the flow meter 24 is read. When 1 liter of the oil liquid is supplied in S18, the process proceeds to S19, and the valve mechanism 3
7. Open the first-stage valve 38 for large flow rate (one-stage operation:
(See FIG. 7). As a result, a large amount of oil liquid is discharged from the fuel supply nozzle 13 to the fuel tank 16. In S20, when the output level of the detection signal output from the pressure sensor 18 is higher than the preset threshold value 1 for foam detection on the minus side, the foam reaches the tip of the discharge pipe 17 and the air introduction hole 52
Is determined to be closed by the bubble, and the process proceeds to S21. S
At 21, the first-stage valve 28 and the second-stage valve 29 are closed to stop refueling (three-stage operation: see FIG. 7). At S22, it is checked whether a predetermined time has elapsed. This predetermined time is an average time required for bubbles generated on the liquid surface to disappear, and is set in advance.

If the predetermined time has elapsed in S22, the process proceeds to S13, where the two-stage valve 39 for the small flow rate of the valve mechanism 37 is opened (two-stage operation: see FIG. 7). This allows additional refueling at a small flow rate. In the next S24, when the output level of the detection signal output from the pressure sensor 18 is higher than the preset threshold 2 for liquid level detection on the minus side, the liquid level reaches the tip of the discharge pipe 17 and the air It is determined that the introduction hole 52 has been closed by the oil liquid, and the process proceeds to S25. In S25, the two-stage valve 29 is closed to stop refueling (three-stage operation: see FIG. 7).

In the next step S26, when the nozzle switch 14a is off, it is determined that the refueling nozzle 13 has been returned to the nozzle hook 14, the pump motor 22 is stopped, and the current refueling process is terminated. However, in S26,
When the nozzle switch 14a is ON, the process proceeds to S28 because the refueling nozzle 13 is not returned to the nozzle hook 14. In S28, it is determined whether or not a predetermined time set in advance has elapsed. If the nozzle switch 14a is on even after the predetermined time has elapsed, it is determined that refueling is to be performed, and the process proceeds to S29, where the two-stage valve 3 for the small flow rate of the valve mechanism 37 is set.
9 is opened (two-step operation: see FIG. 7). In this way, integer fueling at a small flow rate becomes possible.

In the next step S30, the "combination flag" is set to "0". When the combination flag = 0 is set, the normal mode is set. In the next S31,
The cumulative flow rate displayed on the display 36 is read. continue,
In S32, the decimal point of the accumulated refueling amount is “.90”.
Check whether or not. Then, when the decimal point of the accumulated refueling amount becomes “.90” in S32, the process proceeds to S33, and the timer is reset to zero and the timer is started.

In the next step S34, it is checked whether or not the decimal point of the accumulated refueling amount is ".99". And S34
When the decimal point of the cumulative refueling amount becomes “.99” in S3, S3
Go to 5. In S35, the time T until the decimal point of the accumulated refueling amount changes from “.90” to “.99” is compared with a preset reference time TO (for example, TO = 0.7 seconds). When T ≧ TO in S35, the time T required for the decimal point of the accumulated refueling amount to change from “.90” to “.99” is longer than the reference time TO, so that the refueling operator performs a combined operation. Then, the process proceeds to S36.

In S36, the "combined flag" is set to "0".
Check if it is set to. If the "combined flag" is not set to "0" in S36, the process proceeds to S37, and the "combined flag" is set to "1". Then, in the next S38, the first-stage valve 38 is closed. Accordingly, when additional refueling is performed after the refueling nozzle 13 is automatically closed at the time of full refueling, the first-stage valve 28 is closed and the flow rate is reduced. Refueling operation (combined operation) can be easily operated. That is, when the joint operation is performed, even if the operation lever 13a of the refueling nozzle 13 is largely operated to the fully open position, it is possible to perform the integral refueling with a small flow rate passing through the two-stage valve 29, and use the nerve to operate the operation lever 13a. Integer refueling can be completed in a shorter time than in the past, because integer lubrication can be performed.

In particular, when the driver performs self-service refueling, even a driver unfamiliar with the refueling operation can easily perform the integral refueling operation (combined operation). Next S39
Then, it is checked whether or not the nozzle switch 14a is off. In S39, when the nozzle switch 14a is ON, the fuel supply nozzle 13 has not been returned to the nozzle hook 14, so the flow returns to S31. Then, the processes in and after S31 are repeated. In S13, since the "combined flag" was set to "1" in the previous process,
7, the processing of S38 is omitted.

As described above, when performing the integral refueling (combined operation), the processing of S31 to S39 is repeated. In S35, when T <TO, the decimal point of the accumulated refueling amount is changed from “.90” to “0.9”.
9 ”is shorter than the reference time TO.
Judge that the refueling operator is performing normal refueling operation,
Proceed to S42.

In S42, the "combined flag" is set to "1".
Check if it is set to. For example,
If the capacity of the fuel tank 16 is large, it may return to normal refueling during the combining operation. In this case, since the refueling operator pivots the nozzle lever 13a of the refueling nozzle 13 to the fully open position, the discharge flow rate from the refueling nozzle 13 increases, and the decimal point of the accumulated refueling amount from ".90" to ".90". 99 "
Becomes shorter than the reference time TO.

In this case, since the "combined flag" is set to "1" in S37, the process proceeds to S43, and the "combined flag" is set to "0". And the next S4
In step 4, the first-stage valve 38 is opened. Therefore, since the first-stage valve 38 and the second-stage valve 39 of the valve mechanism 37 are opened, the oil liquid passing through the first-stage valve 38 and the second-stage valve 39 is supplied to the oil supply nozzle 33.
And can be refueled at the maximum flow rate.

At the start of refueling, the valve mechanism 3 is set in S14.
Since the second-stage valve 39 of No. 7 is open, a small amount of oil liquid passing through the two-stage valve 39 is supplied to the oil supply nozzle 33, and the oil liquid discharged from the discharge pipe 17 is supplied to the fuel supply port of the fuel tank 16. It is prevented that the air introduction hole 52 is closed due to the rebound at 16a. At the start of refueling, S30
Since the "combined flag" is set to "0", the processes of S43 and S44 are omitted.

In S39, the nozzle switch 1
When 4a is off, since the refueling nozzle 13 has been returned to the nozzle hook 14, it is determined that refueling has been completed, and the process proceeds to S40, in which the pump motor 22 of the pump 22 is stopped. The first-stage valve 38 and the second-stage valve 39 are closed. This completes the integer refueling. In the above-described embodiment, the fuel supply device for supplying fuel to the fuel tank of the vehicle has been described as an example. However, the present invention is not limited to this, and it is needless to say that the present invention can also be applied to a fuel supply device configured to supply oil to another tank. .

[0053]

As described above, according to the present invention, the output of the sensor for detecting the change in pressure generated in the negative pressure generating section is monitored, and the amount of refueling supplied to the refueling nozzle in accordance with the result of determining the output level. , It is possible to accurately detect the liquid level of the refueling port and bubbles generated on the liquid level, and to simplify the configuration of the refueling nozzle to increase the assembly work efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of an embodiment of a fuel supply device according to the present invention.

FIG. 2 is a block diagram of a control circuit 25.

FIG. 3 is a longitudinal sectional view of a fueling nozzle 13;

FIG. 4 is a cross-sectional view of the fueling nozzle 13.

FIG. 5 is an enlarged longitudinal sectional view showing a valve mechanism of a refueling nozzle 13;

FIG. 6 is an enlarged cross-sectional view showing a valve mechanism of the refueling nozzle 13;

FIG. 7: Foam detection, liquid level detection, and one-stage valve 2 when refilling the tank
It is a graph which shows an example of the pressure change accompanying the opening / closing operation | movement of the 8th and 2nd-stage valve 29.

FIG. 8 is a flowchart illustrating a control process performed by the control circuit 25 during refueling.

FIG. 9 is a flowchart illustrating a control process executed by a control circuit 25 subsequent to the process of FIG. 8;

FIG. 10 is a flowchart illustrating a control process executed by a control circuit 25 subsequent to the process of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Refueling device 13 Refueling nozzle 13a Nozzle lever 14 Nozzle hook 14a Nozzle switch 15 Refueling hose 16 Fuel tank 17 Discharge pipe 18 Pressure sensor 20 Liquid feeding pipeline 22 Pump 22a Pump motor 24 Flow meter 25 Control circuit 27 Valve mechanism 28 One-stage valve 29 Two-stage valve 35 Preset switch 43 Valve mechanism 50 Negative pressure generator 51 Main valve body 56, 62 Negative pressure passage 60 Valve shaft 66 Pressure detector 67 Pressure detector

Claims (1)

[Claims] 1. A negative pressure generating section that discharges an oil liquid by a rotation operation of a nozzle lever and generates a negative pressure corresponding to a flow rate, and a negative pressure communicating with the negative pressure generating section and having an opening near a discharge port. A refueling nozzle having a pressure passage; a sensor provided in the negative pressure passage for detecting a change in pressure in the negative pressure passage; monitoring an output of the sensor and reaching an output level reaching a preset value. A refueling device characterized by comprising: a judging means for judging whether or not the refueling has been performed; and a refueling amount control means for controlling a refueling amount supplied to the refueling nozzle in accordance with a judgment result of the judging means.