JPS6226997B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a refueling device.

A refueling device has been developed that has a function that automatically stops refueling accurately by issuing a refueling stop command near the predetermined refueling amount so that no fraction occurs at the predetermined refueling amount (this is called the "just stop function"). has been done.

Refueling stop command operations include, for example, operating the operating lever of the built-in valve of the refueling nozzle two or three times within a short period of time to open and close the nozzle's built-in valve to intermittent refueling; However, in order to improve the accuracy of stopping, for example, the pump motor is slowed down and rotated to reduce the flow rate, and lubrication is performed at a small flow rate using the above-mentioned lubrication stop instruction operation. Normally, refueling is stopped when a predetermined amount of refueling is reached.

However, the current situation is that the transition from normal flow rate to small flow rate (deceleration of the pump motor in the above example) cannot be done instantaneously and is accompanied by a time delay. If the amount of oil that has already been supplied is very close to the amount of oil that should just be stopped (the amount of oil that should just be stopped), an overrun will occur and a larger amount of oil will be refilled than the amount that will just stop. Furthermore, if the amount of oil that has been supplied is close to the amount of oil that has been supplied to stop the nozzle at the time of the stop instruction, there is a risk of overrun due to incorrect operation of the nozzle lever.

The present invention was proposed in view of this point.
A refueling nozzle having a built-in valve, a pump that sends oil to the refueling nozzle via an oil feed path, a drive motor for the refueling pump, a flowmeter interposed in the oil feed path, and measurement by the flowmeter. a transmitter that transmits a number of flow rate pulses corresponding to the amount of oil; a counting circuit that counts the flow rate pulses and generates a counting output; outputs a stop value signal h exactly, and outputs a stop value signal d exactly when the counting output is the most recent value of the exactly stopping value, and the counting output is within a predetermined range close to the exactly stopping value. a counting output determination circuit that outputs a stop permission signal e exactly when the value is , and a predetermined time normally required to open and close the built-in valve of the refueling nozzle at least twice in response to the flow pulse from the transmitter. When the flow rate pulse is intermittently generated at least twice within a period of time, an exactly stop instruction operation acceptance signal c is generated unless the latest stop value signal d is inputted from the counting output determination circuit. and a circuit, when receiving the just stop instruction operation acceptance signal c from the just stop instruction operation determination circuit while inputting the just stop permission signal e from the counting output determination circuit, a predetermined time T normally required for deceleration of the motor is received. ₂ , and generates a normal rotation return signal g when at least one flow pulse is received from the flow pulse generator during this time; When the motor is rotated at a deceleration speed and a stop value signal h is just received from the count output determination circuit during the deceleration rotation of the motor, the motor is stopped, and the motor is sufficiently decelerated by the input of the stop instruction operation reception signal c. and a motor control circuit that returns the motor to normal rotation when receiving a normal rotation return signal g from the timer before the motor is rotated.

Figures 1 and 2 are diagrams for explaining the operating mode in one embodiment of the present invention, where A is the opening degree of the nozzle built-in valve, B and B' are the discharge amount of the oil supply pump, and C is the amount of oil discharge from the nozzle. Indicates the discharge amount.

Now, we are refueling with a refueling nozzle equipped with a so-called auto-stop mechanism that automatically stops refueling by detecting the liquid level. When the tank to be refueled becomes "full," the auto-stop mechanism operates and refueling stops (full stop). (at time t ₁ ), and the amount of oil supplied at this time (full tank amount) Q is 14.5 liters.

If less than 1 liter is a fraction, exactly 1 stop is 1
Since refueling is to be stopped when less than liters reaches 0, if 14.5 liters is the full refueling amount, the stop (refueling) amount is exactly 15 liters.

After the tank is full and stopped, for example, the nozzle lever is opened and closed twice within a certain period of time T ₁ (for example, 1.5 seconds) as a stop instruction operation. In other words, when you pull the nozzle lever for the first time to open the built-in valve at time t ₂ , the flow rate increases, and when you return the lever at time t ₃ , the flow rate becomes 0. Then, when you pull the lever a second time at time t ₄ , the flow rate increases. The flow rate increases again, and when the lever is released again at _t5 , the flow rate becomes 0 again. If the time T ₁ from t ₂ to t ₅ is within a certain period of time (for example, 1.5 seconds), it is recognized that the stop instruction operation has just been properly performed (the stop instruction operation has just been accepted), and the pump motor is decelerated. let

At time t ₅ , the nozzle valve was opened and closed twice after the full tank was stopped, so the full tank refueling amount Q (14.5 in the above example)
In addition to 1 liter of oil, q ₁ and q ₂ of oil are supplied, so the stopping amount (15 liters) - (Q + q ₁ +
q ₂ ) = Remaining oil amount q ₃ is a fixed amount (for example, 0.3 liters)
If it exceeds the limit, it is determined that there is no risk of overrun (excessive lubrication), and the stop function is activated at exactly the same time, and at an arbitrary time point t ₆ after t ₅ , refueling is allowed by pulling the nozzle lever again, and the nozzle is stopped exactly. When the amount is reached ( _t7 ), the refueling is automatically stopped (Fig. 1).

At time t ₅ , the remaining oil quantity q ₃ is within a certain range less than the above certain amount (for example, 0.3 liters ≧ q ₃
＞0.01 liter), then a certain period of time after time t ₅
If the nozzle lever is pulled at, for example, t ₈ within T ₂ (at least the time required for the pump motor to complete deceleration, for example 0.3 seconds), there is a risk of overrun because the pump motor has not yet been sufficiently decelerated. That is, in the above example, it cannot be expected that the fuel supply will stop exactly at 15 liters, and the refueling will automatically stop at 15.02 liters, for example. Therefore,
In this case, the stop function is just stopped and the pump motor is returned to normal rotation. That is, the operation shown by the dotted line in FIG. 2 is performed. (In this case, the refueling stop is performed manually, for example.) If the nozzle lever is not operated within T ₂ hours, the stop function will be maintained, and after T ₂ hours, for example at time t ₉ , the nozzle will be stopped. When the lever is pulled, refueling at a small flow rate is resumed, and the refueling is stopped just when the remaining amount of refueling is completed. That is, the operation shown by the solid line in FIG. 2 is performed.

At time t ₅ , the remaining oil amount is, for example, in the above example.
If it is less than 0.01 liters (q ₃ ≦0.01 liters), overrun will be unavoidable if small flow rate lubrication is achieved by decelerating the pump motor, which is practically possible. Automatic deceleration is not performed (Figure 2 B').

In short, in one embodiment of the present invention, when the stop instruction operation is certified or accepted, if the remaining oil amount is below a certain amount, the stop function is blocked, and if the remaining oil amount exceeds the certain amount, the stop function is refilled. The flow rate or flow velocity is decreased, and if the remaining oil supply amount is within a certain range that exceeds the certain amount, a predetermined time from the time the stop instruction operation is received.
When the flow rate or flow velocity exceeds a predetermined value within _T2 , the acceptance of the stop instruction operation is canceled.

FIG. 3 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
The figure is a block diagram showing an example of a control section.

In FIG. 3, 1 is a housing of a ground-mounted oil supply system, and 2 is an oil feed pump, which is driven by a motor 3 and pumps up oil from an underground oil storage tank (not shown) through a pumping pipe 4 and an oil feed path 5. send to 6 is a flow meter installed in the oil feed path 5, which measures the amount of oil fed;
The transmitter 7 outputs a flow rate pulse (for example, one pulse per 1/100 liter) in accordance with the measured value. 8 is a refueling hose, and 9 is a refueling nozzle attached to the tip of the refueling hose 8.

10 is a control unit, 11 is a display, 12 is an alarm including a lamp 12a and a buzzer 12b, 13 is a nozzle case provided in the refueling device housing 1, in which the refueling nozzle 9 is housed, and the refueling nozzle 9 can be attached or removed. The nozzle switch 14 operates in response to the operation, and a nozzle signal is input to the control section 10. The nozzle signal rises (becomes H) when the nozzle 9 is removed from the nozzle case 13, and falls (becomes L) when the nozzle is returned to the case. In the following, the nozzle signal H means the rising edge of the signal, and the nozzle signal L means the falling edge of the signal.

In FIG. 4, 15 is a motor control circuit which energizes the pump motor 3 according to the nozzle signal H and deenergizes the motor 3 according to the nozzle signal L.

Nozzle signal H causes flow rate pulse counting circuit 16 to return to zero. Note that the alarm control circuit 17 is reset by the nozzle signal L.

When the lever of the refueling nozzle 9 is operated to start refueling, the counting circuit 16 activates the pulse transmitter 7 according to the amount of refueling.
The flow rate pulses f outputted from the controller are counted, and the amount of refueling is displayed on the display 11 via the display drive circuit 18. The output of the counting circuit 16 is also given to the determination circuit 19.

It is assumed that the count output of the counting circuit 16 is generated in units of 0.01 (liter), and the stop amount is exactly the amount that has no fraction less than 1 liter, as described above, that is, the amount with zero (.00) after the decimal point. Suppose that Count output determination circuit 19 (hereinafter simply referred to as determination circuit 1)
9), if the count output of the counting circuit 16 is within a certain range (for example, .70 to .98) close to the stop amount, the stop permission signal e (hereinafter simply signal e) is detected.
), and if it is exactly the most recent value of the stop amount (for example, .99), it outputs the most recent stop value signal d (hereinafter simply referred to as signal d), and if it is exactly the most recent value of the stop amount (.
00), the stop value signal (one pulse) h
(hereinafter simply referred to as signal h) until it just exceeds the stop value and reaches the lower limit of the above certain range (.00
~． ．． 69) just outputs a stop enable signal j (hereinafter simply referred to as signal j).

For example, as mentioned above, when refueling is automatically stopped when the tank is "full," the flow pulses will stop generating, but if you just pull the nozzle lever again to instruct a stop, the flow pulses will continue while the lever is pulled. Since it will occur again, if you pull the lever twice, the flow rate pulse will intermittently repeat the generation state twice.

The stop instruction operation determination circuit 20 (hereinafter simply referred to as determination circuit 20) determines whether the specified time T ₁ (for example, 1.5
If the above pulse generation state is repeated twice within a second), it is determined that the stop instruction operation has just been properly performed, and the stop instruction operation acceptance signal (one pulse) c
(hereinafter simply referred to as signal c). The signal c is applied to the motor control circuit 15 to cause the motor 3 to rotate at a reduced speed. However, if the signal d is input to the determination circuit 20 at this time, (the amount of oil filled up to that point is very close to the stop amount and the amount of remaining oil is very small (less than 0.01 liter in the above example), an overrun will occur. (as it is unavoidable), the generation of signal c is prevented,
The motor 3 is therefore not decelerated and the stop function is not activated (FIG. 2B').

When the signal c is output, it is also given to the alarm control circuit 17. At this time, the determination circuit 19 outputs a signal j
is being output. (As mentioned above, there is sufficient margin for just the stop amount), this signal j is also input to the alarm control circuit 17, and the alarm control circuit 17 outputs the signal i according to the signals c and j, and the alarm 12 (for example, a lamp 12a and a buzzer 12b) to notify that the stop instruction operation has just been accepted.

Therefore, when the nozzle lever is pulled to perform oil supply at a small flow rate, a count output corresponding to the amount of oil supply is given to the determination circuit 19. When the counting output reaches ".00" (refueling of the remaining amount of oil is completed), judgment circuit 1
9 sends the signal (one pulse) h to the motor control circuit 1
Give to 5. The motor control circuit 15 (exactly) stops the motor 3 using the AND condition that the motor 3 is being rotated at a reduced speed and the input of the signal h (the first
Figure behavior).

The signal c is also given to the timer circuit 21. At this time, the determination circuit 19 sends a signal e to the timer circuit 21.
(The output of the counting circuit 16 is .70~
．． 98), the timer circuit 21 is set for T ₂ hours (in the example described above).
0.3 seconds) Timing operation. If one or more than a certain number of flow rate pulses f are given to the timer circuit 21 from the pulse transmitter 7 within T ₂ hours (because the nozzle valve is opened again before the motor 3 is sufficiently decelerated) Assuming that there is a possibility of overrun (exceeding the stop amount) depending on the stop function, the timer circuit 21 generates a normal rotation return signal (one pulse) g (hereinafter simply referred to as signal g). This signal g is given to the motor control circuit 15 and returns the motor 3 to normal rotation with priority over the signal c, so that the stop function is not activated. (Figure 2A,
(Operations shown by dotted lines in B and C).

T The flow rate pulse f is detected by the timer circuit 21 within ₂ hours.
When no signal is given (when the lever of the nozzle is not pulled just after the stop command operation), the timer circuit 21 does not generate the signal g, and therefore the signal c causes the motor 3 to rotate at a reduced speed. When T ₂ hours have passed without the signal g being output, the timer circuit 19 sends the signal k to the alarm control circuit 17 to output the signal i, causing the alarm 12 to notify that the stop instruction operation has just been accepted. Make it known.

Then, the nozzle lever is pulled (time _t9 in FIG. 2), and the remaining amount of oil is supplied at a small flow rate (operation shown by solid lines in FIG. 2 A to C). The subsequent operations are the same as those already described as the operations in FIG.

Once the stop function has been inhibited, the operation will be under manual control.

After the motor 3 has just been stopped by the stop function, if you want to add additional lubrication before returning the nozzle to the nozzle case, press the additional lubrication switch 22, and the signal m is given to the motor control circuit 15 to stop the motor 3. It is reenergized and also applied to the alarm control circuit 17 to stop the alarm operation. That is,
The device returns to its initial state, except that counting circuit 16 and display 11 are not reset.

When refueling is completed and the nozzle is returned to the nozzle case, the nozzle signal L resets the counting circuit 16 and the alarm control circuit 17, and is also applied to the motor control circuit 15, if the motor 3 is not deenergized. Deactivate.

In the above explanation, the amount of oil supplied is controlled in units of volume (for example, 1/100 liter), but it may also be controlled in units of amount (yen). Therefore, the term refueling value includes both of these cases. Further, although the flow rate (velocity) is controlled (changed, stopped, etc.) by controlling the rotation of the pump motor, other methods such as controlling a solenoid valve provided in the oil supply channel may be used. Furthermore, the refueling device is not limited to a ground-mounted type, and includes, for example, a high-placed type.

As described above, according to the present invention, refueling can be stopped precisely.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining different operating modes of a device according to an embodiment of the present invention, FIG. 3 is a diagram schematically showing the mechanical configuration of the device, and FIG. 3
FIG. 3 is a block diagram showing an example of a control section of the device shown in the figure. DESCRIPTION OF SYMBOLS 1...Housing, 2...Pump, 3...Pump motor, 6...Flow meter, 7...Flow rate pulse transmitter, 10...
Control unit, 12... Alarm, 13... Nozzle case, 1
4...Nozzle switch.

Claims (1)

[Scope of Claims] 1. A refueling nozzle having a built-in valve, a pump for supplying oil to the refueling nozzle via an oil feed path, a drive motor for the refueling pump, and a flow meter interposed in the oil feed path. a transmitter that transmits a number of flow rate pulses corresponding to the amount of oil measured by the flow meter; a counting circuit that counts the flow rate pulses and generates a count output; When the output is exactly the stop value, a stop value signal h is outputted; when the count output is exactly the most recent value of the stop value, the most recent stop value signal d is output; a count output determination circuit that outputs a stop permission signal e when the value is within a predetermined range close to When the flow rate pulse occurs intermittently at least twice within a predetermined time normally required for When the just-stop instruction operation acceptance signal c is received from the just-stop instruction operation determination circuit while the just-stop permission signal e is being input from the count output judgment circuit, the motor is decelerated. a timer circuit that measures a predetermined time _T2 that is normally required, and generates a normal rotation return signal g when at least one flow pulse is received from the flow pulse generator during this time; and the just stop instruction operation acceptance signal. The motor is decelerated and rotated by the input of c, and when the stop value signal h is just received from the counting output determination circuit during the decelerated rotation of the motor, the motor is stopped, and the stop instruction operation acceptance signal c is just input. a motor control circuit that returns the motor to normal rotation when receiving a normal rotation return signal g from the timer before the motor is sufficiently decelerated.