JPS6213996Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid supply device such as a fuel supply device used at a gas station or the like.

For example, when refueling a car at a gas station, a customer usually specifies the amount of fuel to be filled (for example, 20) or specifies what is called a "full tank." In the former case, if you exceed 20 orders, e.g.
Even if you refuel 20.1, it is actually difficult to charge an additional amount for the excess 0.1, so it is often serviced. Nowadays, oil such as gasoline is becoming more expensive, and if this kind of situation is repeated for many customers,
It will be a big loss.

Even in the latter case, for convenience of calculation, the amount of refueling is usually adjusted so that it is not a fraction after the decimal point, even if it is called "full tank." In practice, it is extremely difficult to stop the service, and in many cases there is no charge for fractional minutes as a service.

In order to solve this problem, a method is used in which a preset device is installed and the preset amount of oil is supplied in units of liters, for example, but since the preset device is quite expensive, it may not be possible to attach it to all lubrication devices. There is.

Recently, a refueling device has been proposed that restarts refueling after the nozzle automatically closes and stops refueling when the 1/10 first reaches zero, but the current "automatic stop nozzle" Due to its structure, malfunctions due to bubbles cannot be avoided, and even if a few liters remain until the tank is "full," the nozzle will automatically stop, and refueling will be completed when, for example, 1/10 reaches zero. The disadvantage is that it is not possible to refuel with a full tank.

In addition, after switching from normal flow rate lubrication to small flow rate lubrication as the target lubrication amount approaches, 1/10
A method has also been proposed in which refueling is stopped when the amount of fuel reaches zero for the first time, but it is difficult to operate the lever on the refueling nozzle to reduce the flow rate. Not suitable.

In consideration of the above points, this proposal is designed to reduce the flow rate by operating the lever of the refueling nozzle several times when refueling has been completed close to the target refueling amount, or when refueling has been stopped due to the automatic stop mechanism. After that, the system switches to lubrication, and then stops lubrication precisely when the target amount of lubrication is reached.There is a pipe line that supplies the stored liquid pumped out to the liquid container, and a pipe that is inserted into this pipe line. a flow rate pulse generator that generates a flow rate pulse for each predetermined flow rate value of the flow meter; a plurality of counters each representing a plurality of digits for counting the flow rate pulses; A changeover switch selects and outputs a carry output of the counter or a predetermined count value output, and a flow pulse from the flow rate pulse generator is input, and the interruption and resumption of this input is performed within a predetermined time. a flow rate pulse intermittent detection means that detects that a plurality of occurrences have occurred and outputs a detection signal; and a carry output of a counter selected from the detection signal and the counter by the changeover switch or a predetermined count value; It is characterized by comprising means for outputting a control signal for controlling liquid supply in response to an AND condition with the output.

The illustrated embodiment will be described in detail below.

In FIG. 1, numeral 1 is a flow rate pulse transmitter, and as is well known, the measured value (oil amount) of a flow meter (not shown) inserted in the oil supply path of the oil supply device is, for example, 0.01.
Outputs one pulse (flow rate pulse) every time.

2 is a nozzle switch, which is installed in connection with the case that houses the refueling nozzle in the refueling device, and when the nozzle is removed from the case, a signal (nozzle signal) S ₁ is sent.
occurs.

The nozzle signal S ₁ is applied to the motor control circuit 3 to energize the pump motor M, and is also applied to the timer circuit 4 . When the nozzle is returned to the nozzle case, the signal _S1 disappears and the motor M is deenergized.

Simultaneously with the input of the nozzle signal _S1 , the timer circuit 4 outputs a signal S2 to the switch circuit ₅ to open the switch circuit ₅ , thereby causing the flow rate pulse ( 1/100
After a preset time elapses, for example 0.3 seconds (this is the time when the hose reaches its expansion limit due to oil supply as described later), the switch circuit 5 is closed and the signal S ₃ is input. occurs. This signal _S3 is given as a reset signal to the flow rate pulse counters _C1 to _C5 .

The refueling hose to which the nozzle is connected has some elasticity, so when the refueling pump is activated, the refueling hose expands even when the nozzle's built-in valve is closed (even before refueling starts). As much oil as possible is sent toward the nozzle. Therefore, if the counters _C1 to _C5 are reset and a flow rate pulse is input at the same time as the nozzle is removed from the case, the counters will start counting before refueling has started, giving a bad impression to the refueling customer. . Therefore, the timer circuit 4 is set to the time required for the hose to reach its expansion limit (for example, 0.3 seconds), and the counting operation of the counter is inhibited during this time.

As refueling progresses, a flow rate pulse (1/100 pulse) from the transmitter 1 is given to a 1/100 digit counter _C1 . This counter _C1 is a decimal counter,
Every time one 1/100 pulse is counted, the count value output or display signal _a1 changes, and one carry pulse (1/10 pulse) is output every time 10 pulses are counted.

C ₂ , C ₃ and C ₄ are 1/10 digit, 1 digit and 10 digit decimal counters, respectively, and the carry pulses of the counters C ₁ , C ₂ and C ₃ of one lower digit, that is, 1/10 pulse, respectively, 1 pulse and 10 pulses are received, and count value pulses or display signals a ₂ , a ₃ and a ₄ are generated each time one input pulse is counted.
changes, and every time 10 input pulses are counted, a carry pulse (1 pulse, 10 pulse,
100 pulses).

C ₅ is a 100 digit counter and C ₄ is a 10 digit counter
The count value pulse (display signal) _a5 changes every time 100 pulses are counted.

The count value outputs a ₁ to _{a 5} are input to the display drive circuit 6, and the display 7 displays the amount of oil supplied in 1/100 units according to the count value of the flow rate pulse.

The 1/10 pulse, 1 pulse and 10 pulses are applied to one input of an AND circuit 9 via a changeover switch 8.

10 is a flow pulse (1/100 pulse) intermittent detection circuit, which is reset by the signal _S3 from the timer 4, and after the 1/100 pulse is input and the input of this pulse is interrupted (that is, for a predetermined period of time, e.g. The phenomenon in which the pulse input is stopped for 0.1 seconds) and then the pulse is input again (refueling intermittent phenomenon) occurs for a predetermined time after the flow rate pulse input to the detection circuit 10 is interrupted for the first time after refueling starts. When repeated a predetermined number of times within (for example, 2 seconds),
Outputs small flow rate lubrication instruction signal _S4 . The above refueling intermittent phenomenon occurs when the tank to be refueled is nearly full, or after the automatic stop mechanism of the refueling nozzle is activated and refueling is temporarily stopped, a small amount can be generated by operating the built-in valve opening/closing lever of the refueling nozzle. This phenomenon occurs when refueling is performed intermittently.

The signal _S4 is input to the motor control circuit 3 and the motor M
The rotational speed of the engine is reduced, and from then on, oil is supplied from the oil supply nozzle at a small flow rate.

The signal S ₄ is also applied to the other input of the AND circuit 9. The first carry pulse from any one of counters C ₁ , C ₂ , C ₃ after this input (signal S ₄ ) is applied, i.e. 1/10 pulse, 1 pulse, or 10 pulses (example shown). When the movable contact 8' of the changeover switch 8 is connected, one pulse from the counter _C2 is applied to the one input of the AND circuit 9, and the AND circuit 9 generates an output _S5 . The signal is applied to the motor control circuit 3 to stop the motor M. When the signal S ₅ disappears, the signal
If S ₁ is present, motor M is reenergized.

In the above configuration, for example, when "full tank" refueling is specified and the nozzle is removed from the nozzle case for refueling, the motor M is energized by the signal S ₁ and the signal S ₂
The switch circuit 5 is opened, and after the set time of the timer 4 has elapsed, the switch circuit 4 is opened due to the disappearance of the signal _S2 .
is closed, the counters _C1 to _C5 are reset to zero by the signal _S3 , and the detection circuit 10 is reset.

1/100 when you open the nozzle valve and start refueling
Pulses are output from the starter 1 and the amount of refueling is sequentially displayed on the display 7. 1/100 pulse is detector 10
It is also given to

When the target refueling amount is approached and the refueling is stopped by manually operating the nozzle lever or by operating the auto-stop mechanism, the 1/100 pulse input to the detector 10 is cut off. Since there is some margin before reaching the target amount of refueling, or even if the auto-stop mechanism operates, it is still possible to refill the target tank with a small amount of refueling, so the refueling operator operates the nozzle's built-in valve opening/closing lever as described above. Continue refueling intermittently by repeatedly opening and closing the built-in valve. Therefore,
The 1/100 pulse is intermittently input to the detector 10. When this intermittent input of pulses is repeated a predetermined number of times at a predetermined time, the detection circuit 10 outputs a signal _S4 and decreases the rotation speed of the motor M, so the nozzle lever continues to be pulled all the way. Even if the built-in valve is fully opened, only a small amount of oil is supplied, so a large amount of oil will not spout out and overflow from the oil receiving port.

If the amount of refueling when the signal _S4 is output from the detector 10 is, for example, 19.5, the count value of the counter _C4 at that time is 1 (=10),
The count value of _C3 is 9 (=9), and the count value of counter _C2 is 5 (0.5). Now, if the movable arm 8' of the changeover switch 8 is connected in advance to the carry output of the counter _C2 as shown in Fig. 1, a carry pulse (1 pulse) of the counter _C2 will be generated at the refueling point of 20. is given to the other input of the AND circuit 9,
Here, the AND condition is satisfied and output _S5 is generated from the AND circuit 9, and this signal _S5 is output to the motor control circuit 3.
is applied to stop the energization of the pump motor M.

By the way, when refueling a car's gasoline tank, for example, after the refueling operation is completed, there are cases where there is room in the gasoline tank and refueling is resumed, or when refueling is performed in a large number of containers (for example, kerosene containers) one after another. be. In such a case, it is troublesome and time consuming to return the nozzle to the nozzle case and then remove it from the nozzle case again in order to reenergize the motor that has been deenergized, and each time the nozzle is returned to the nozzle case, the counter C ₁ ~ If _C5 is reset, the total amount of oil supplied becomes unknown, which is inconvenient.

In view of this inconvenience, the present invention provides a manual operating means for reenergizing the pump motor M without resetting the counters _C1 to _C5 . In the illustrated embodiment, this manual operating means is a manual reset switch 11 which, by operating this switch 11, provides a reset signal to the detector 10, thereby reducing its output _S4 and hence the output _S5 of the AND circuit 9. This causes the motor M to stop being energized. That is, since the motor M is energized again, the nozzle valve can be operated to resume refueling. In this case, since the reset signal from the manual reset switch 11 does not reset the counters _C1 to _C5 , the amount of oil supplied after restarting is added to the amount of oil supplied up to the time of stop.

The arm 8' of the changeover switch 8 can also be connected to the carry output of the counter _C1 or _C3 , and when connected to the former, the amount of oil to be supplied is, for example, 1.4 when filling a small tank of a motorcycle.
When the nozzle lever is opened and closed several times to switch to small flow rate lubrication at the point in time when 1.5 is exceeded, the AND circuit 9 generates an output S ₅ by the next 1/10 pulse emitted from the counter C ₁ at the 1.5 lubrication point. refueling will be stopped.

In addition, the arm 8' of the changeover switch 8 is
If connected to the carry output of C ₃ , when refueling a large tank, the refueling amount will be 190, for example.
When the nozzle lever is opened and closed several times to switch to small flow rate lubrication, the AND circuit 9 generates an output S ₅ by the next 10 pulses emitted from the counter C ₃ at the point of 200 lubrication. Refueling is stopped.

FIG. 2 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate corresponding elements and the operations are substantially the same, so the explanation will be omitted and only the different parts will be explained.

In Fig. 2, when the refueling nozzle is removed from the nozzle case, the nozzle signal _S1 generated from the nozzle switch 2 is directly applied to the counters _C1 to _C5 to reset them. As a measure to prevent the counting of flow rate pulses due to expansion of the pulse count, a non-counting pulse number setting circuit 12 is provided in conjunction with the 1/100 pulse counter C ₁ instead of the timer circuit 4 and switch circuit 5 shown in FIG. .

This setting circuit 12 is set to 1/100 of the number set in the setting circuit 12 after the counter _C1 is reset.
Generation of the count output a ₁ is prevented until the pulses are counted by the counter C ₁ (therefore, the display on the display 7 remains at 0). For example, if the limit to which a hose with a closed built-in valve expands due to oil supply is 3 pulses (1/100 pulse), the setting value of the setting circuit 12 is set to 4 (pulses). In this case counter C ₁
is a count output until 4 1/100 pulses are counted.
It does not generate a ₁ , and only generates the counting output a ₁ when the fifth item is counted. Therefore, the 1/100 digit display on the display 7 is 0, 5, 6, 7, 8, 9, 0, 1, 2...
...changes.

In the configuration shown in FIG. 2, the detection output signal _S4 from the flow rate pulse intermittent detector 10 is
4 to one input of each. The outputs of determination circuits 15 and 16 are applied to the other inputs of AND circuits 13 and 14, respectively. Judgment circuit 1
Count value outputs a ₂ , a ₃ , a ₄ of flow rate pulse counters C ₂ , C ₃ , C ₄ are applied to respective inputs of 5 and 16 via a changeover switch 8 .

The judgment circuit 15 is a movable contact 8' of the changeover switch 8.
counters C ₂ , C ₃ , connected by switching
When the count value of C ₄ becomes 8, 9, or 0, the output S ₆ is generated, and the judgment circuit 16 generates the output S ₇ when the count value of the counter is 0. They are each configured to do so.

Therefore, assuming that the movable contact 8' of the changeover switch 8 is connected to the count value output _a2 of the counter _C2 as shown, after the detection signal _S4 is generated, the count value output _a2
When becomes one of 8, 9, and 0, the determination circuit 15 generates an output S ₆ , and therefore, the output of the AND circuit 13 is given to the motor control circuit 3 as a small flow rate lubrication signal. That is, the control circuit 3 uses the output _S8 from the AND circuit 13 to reduce the rotational speed of the motor M to perform small-flow oil supply.

Next, when the count value of the counter _C2 becomes 0, the determination circuit 16 generates an output _S7 , and therefore the AND circuit 1
The output _S9 from 4 is given to the motor control circuit 3 as a stop signal to stop the motor M.

The reason why the setting value of the judgment circuit 15 includes not only one value (e.g. 8) but also larger values up to 10 (e.g. 9, 0 (=10)) is because the detection signal _S4 is output. When the count value of counter C ₂ (or C ₃ or C ₄ ) has already exceeded 8 and becomes 9 or 0
This is because, in this case as well, the system immediately switches to small flow rate lubrication (without waiting for the count value to reach 8 next time). Note that if the count value of counter C ₂ (or C ₃ or C ₄ ) is 0 when the detection signal S ₄ is generated, outputs S ₈ and S ₉ are generated from both AND circuits 13 and 14 at the same time. In this case, the motor M is immediately stopped without performing small-flow lubrication.

Although the embodiments have been described above, the present invention can be modified in various ways.

In the embodiment shown in FIG. 2, when the detection signal _S4 is output, the count value of one of the counters _C2 to _C3 is 8.
Even when the value exceeds 9, the count value becomes 0 after switching to small flow lubrication, or the count value becomes 0.
When the motor M
When there is a possibility of overrun, the counter
The flow rate cannot be switched to the small flow rate until the count value of C ₂ (or C ₃ or C ₄ ) reaches 8, and during this time, the judgment circuit 1
6 is the count value of counter C ₂ (or C ₃ or C ₄ ) 0
It is also possible to configure such that the motor M is not stopped even if the output of the AND circuit 14 is generated by determining this.

In the illustrated example, switching to a small flow rate is performed by reducing the rotation speed of the motor M.
Instead of such a configuration, it is also possible to insert one or more electromagnetic valves into the oil feed path and change the flow rate by changing the degree of opening or the number of valves closed.

Instead of control based on the amount of fuel supplied, control based on the amount of fuel supplied can also be performed.

The output of the detection signal _S4 may be notified by sound or light.

Furthermore, the present invention can be implemented in oil supply devices other than oil supply devices.

As described above, according to the present invention, accurate liquid supply can be performed efficiently with simple operations. In particular, according to the present invention, the output of a counter with different digits is switched and used to obtain a refueling stop signal, so the unit amount that can be stopped for refueling can be changed depending on the volume of the target to be refueled, for example, the tank capacity. Refueling can be done in 0.1 liter increments for small mini bikes, 1 liter increments for regular cars, and 10 liter increments when refueling the drum, so you can quickly and accurately fill the tank to be refueled. It is possible to fill up the tank regardless of its size.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a circuit according to one embodiment of the present invention, and FIG. 2 is a block diagram of another embodiment. DESCRIPTION OF SYMBOLS 1... Flow rate pulse transmitter, 2... Nozzle switch, 3... Pump motor energization control circuit, 4... Timer circuit, 5... Switch circuit, 6... Display drive circuit, 7... Display, 8...changeover switch,
9,13,14...AND circuit, 10...Detector, 11...Manual reset switch, 12...Non-count pulse number setting circuit, 15,16...Judgment circuit, _C1 to _C5 ...Pulse counter , _S1 to _S8 ...Signal, M...Pump motor.

Claims (1)

[Scope of Claim for Utility Model Registration] A pipe line that supplies stored liquid pumped by a pump to a supplied liquid container, a flow meter inserted into this pipe line, and a flow rate pulse every predetermined measured value of this flow meter. a flow rate pulse oscillator that generates a flow rate pulse, a plurality of counters each representing a plurality of digits for counting the flow rate pulse, and a carry output of each of the counters or a predetermined count value output selected and outputted. A flow pulse intermittent detection device receives a flow pulse from the flow pulse generator and outputs a detection signal by detecting that the input is interrupted and restarted a predetermined number of times within a predetermined time. outputting a control signal for controlling liquid supply in response to an AND condition between the detection signal and a carry output of a counter selectively outputted by the changeover switch among the counters or a predetermined count value output; A liquid supply device characterized by comprising means for.