JPS6154675B2 - - Google Patents

Description

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

2. Description of the Related Art When refueling a car or the like at a gasoline filling station, the customer often specifies the amount of refueling (or the amount of refueling) in advance. In this case, a prespecified refueling amount (for example, 15
In order to refuel accurately (1 liter), a filling station worker throttles the valve of the refueling nozzle a little before reaching the specified refueling amount (for example, when refueling of 14.8 liters is completed) to adjust the refueling flow rate (or flow rate) to the normal flow rate (or flow rate). ) to a small flow rate (or flow rate) and continue refueling, and only after changing to the small flow rate will the predetermined amount of refueling or the digit of the amount (for example, the digit of less than 1 liter or 100 yen) become zero. A device (hereinafter referred to as a stop device) has been proposed that automatically stops refueling when the amount of refueling reaches 15 liters (in the above example, the amount of refueling reaches 15 liters).

On the other hand, the customer's specified refueling amount or amount can be set (preset) in the device in advance, and the refueling amount (or amount)
A device that performs lubrication by switching the normal liquid supply flow rate (or flow rate) to a smaller flow rate (or flow rate) a predetermined value before the set value, and automatically stops the lubrication when the set value is reached (so-called preset lubrication). A device) has also been proposed.

However, when the preset oil supply device and the stop device as described above are used together, the following problem arises.

Now, there is a function (preset stop function) that switches from normal flow rate lubrication to small flow rate lubrication 0.2 liters before the preset amount and stops the lubrication when the preset amount is reached, and a function that stops the lubrication when the preset amount is reached, and a predetermined unit amount (e.g. In a device that simply combines a function that stops refueling when the value in the digits less than 1 liter or 100 yen becomes zero (exact stop function), it is possible to preset refueling for 2000 yen worth of oil with a unit price of 133 yen. Suppose we did.

In this case, as shown in FIG. 1A, the refueling is stopped before the amount of refueling reaches 2,000 yen. In other words, the normal flow rate is switched to the small flow rate 0.2 liters before the amount (15.038 liters) corresponding to the preset metal (2000 yen worth), so (1 liter)
The stop function worked exactly when 15 liters of fuel was filled and fueling was stopped.

Alternatively, even if you preset 10 liters of oil with a unit price of 131 yen, as shown in Figure 1B, the flow rate will be switched from the normal flow rate to the small flow rate when 9.8 liters of oil has been refilled, so that the amount of oil worth 1,300 yen (9.924 liters) will be refilled. At (100 yen), refueling is stopped by the stop function.

In either case, the desired preset amount of oil cannot be supplied.

The present invention has been proposed in view of the above-mentioned disadvantages.The present invention has been proposed in view of the above-mentioned disadvantages. There is an exact stop function that automatically stops liquid supply when the predetermined digit of the amount or amount reaches zero, and a function that automatically stops liquid supply when the predetermined number of digits of the amount or amount reaches zero, and a function that automatically stops liquid supply when the predetermined number of digits of the amount or amount reaches zero. It also has a preset function that automatically switches the normal liquid supply flow rate or flow rate to a smaller flow rate or flow rate and automatically stops the liquid supply when the set value is reached, and the preset function allows supply at a small flow rate. In the liquid, the operation by the above-mentioned stop function is prevented.

The illustrated embodiment will be described in detail below.

In the figure, reference numeral 1 is a flow rate pulse transmitter, which measures the measured value (oil amount) of a flow meter (not shown) inserted in the oil supply path of the oil supply device as well-known as the oil supply progresses.
For example, one pulse (flow rate pulse) is output for every 0.01 liter. This flow rate pulse is applied to subtraction counters 2, 3, 4, addition counter 5, arithmetic circuit 6, and comparison circuit 7.

As can be easily seen, when the flow rate pulse (0.01 liter pulse) increases, the pulse interval becomes narrower and the period becomes shorter, and as the flow rate decreases, the pulse interval becomes wider and the period becomes longer.

The addition counter 5 adds the flow rate pulse (0.01 liter pulse) and outputs the addition result as the oil supply amount signal a and the oil supply amount carry signal (1 liter pulse) b every 100 counts. The signal a is given to the display drive circuit 8 and causes the oil supply amount display 9 to display the oil supply amount.

10 is a unit price setting circuit, which sets the refueling unit price (for example, 130
Yen/liter) is set, and the corresponding signal c is output. The arithmetic circuit 6 generates a refueling amount pulse (yen pulse) from this unit price signal c and the 0.01 liter pulse from the transmitter 1, and adds this to the addition counter 1.
Give to 1. The addition counter 11 receives the refueling amount signal d as the addition result and the refueling amount carry signal (100 yen) for every 100 yen.
Output circular pulse) e. The signal d is given to the display drive circuit 12 and causes the display 13 to display the refueling amount.

The unit price signal c is also applied to the display drive circuit 14, and the unit price of refueling is displayed on the unit price display 15.

Reference numeral 16 denotes a nozzle switch, which is installed in association with, for example, a case housing a refueling nozzle in the refueling apparatus, and generates a signal f when the nozzle is removed from the case. The signal f is used as a reset signal for counters 2 and 3.
4, 5, 11 and the comparator circuit 7 to reset them and energize the pump motor M via the control circuit 17. When the nozzle is returned to the nozzle case, the signal f disappears and the motor M is deenergized.

The comparison circuit 7 compares the pulse width or period of the flow rate pulse (0.01 little pulse) generated from the transmitter 1 according to the progress of refueling with the pulse width or period range set by the setting circuit 18, and determines whether the former is When the latter range is exceeded, that is, when the nozzle valve is throttled to a small flow rate, an output (small flow detection signal) g is generated.

The setting range of the setting circuit 18 is normally determined depending on the degree of throttling (opening degree) of the nozzle valve when performing small flow rate oil supply. This setting value is variable.

The signal g is applied to the AND circuit 20 as one input h via the switching circuit 19. AND circuit 20
A signal i from the switching circuit 21 is applied to the other input of the switch. The switching circuit 21 responds to the switching signal j from the changeover switch 22 and outputs the 1-liter pulse b from the addition counter 5 or the 1-liter pulse b from the addition counter 11.
A signal i is output based on one of the 100 yen pulses e. That is, depending on whether refueling is to be stopped based on the amount of refueling (stopping exactly in units of 1 liter) or based on the amount of refueling (stopping exactly in units of 100 yen), the switch 22 is operated and the signal b or e is activated.
is selected and a signal i is output based on this.

AND circuit 20 generates an output (just a stop command signal) k when it receives one input signal h and the other input signal i. In other words, when the desired amount of oil is, for example, 15 liters (or 2,000 yen) and oil is being refueled at a normal flow rate, the nozzle valve is throttled down to a small flow rate when 14.8 liters (or 1,970 yen) has been refueled. (signal h generation), then the first 1 liter pulse b (or 100 yen pulse e) is generated (15 liter or
2000 yen (refueling is completed), the AND circuit 20 generates an output k.

The signal k is applied as one input to the AND circuit 23 and is also applied to the motor control circuit 17 via the OR circuit 24 to deenergize the motor M.

The above operation determines the desired amount of oil (in liters)
Or change the amount of refueling (in units of 100 yen) from a normal flow rate (nozzle valve fully open) to a small flow rate (by closing the nozzle valve) before a certain amount (1 liter or 100 yen or less) This means that refueling will be stopped the first time the value in the digit less than 1 liter or 100 yen becomes zero, that is, when the value in the digit less than 1 liter or 100 yen increases by 1. When refueling is stopped in this way, it is called "just stopping (in units of 1 liter or 100 yen)."

As mentioned above, this exact stop function produces inconvenient results when preset lubrication is configured to change to small flow lubrication a certain amount before the preset value, and the present invention prevents such inconveniences. It is something to do.

Returning to the diagram, 25 and 26 are preset circuits,
The desired refueling amount (liter) and refueling amount (yen) are set respectively, and corresponding signals m and n are generated. The signal m corresponding to the preset amount (for example, 10 liters) is sent to the subtraction counter 2 and the arithmetic circuit 2.
7, preset metal (e.g. 2000 yen)
A signal n corresponding to is given to the arithmetic circuit 28.
Note that the preset amount and amount are set alternatively.
The arithmetic circuit 28 is also given the set unit price signal c from the unit price setting circuit 10, performs the calculation of n/c, outputs the resulting oil supply amount signal n', and selectively subtracts it from the signal m from the preset circuit 25. The signal is applied to the counter 2 and the arithmetic circuit 27.

The arithmetic circuit 27 is given a signal p corresponding to the amount of refueling to be performed at a small flow rate (for example, 0.2 liters) from the setting circuit 29, and the signal p is given from the value of the signal m (or n') (for example, 10 liters). The value obtained by subtracting the value (for example, 0.2 liters) (9.8 liters) is stored in the subtraction counter 3. On the other hand, the value of the signal n (or n') (in the above example) is stored in the subtraction counter 2.
10 liters) is memorized.

As refueling progresses, a flow rate pulse (0.01 little pulse) is transmitted from the transmitter 1 and applied to the subtraction counters 2 and 3. Subtraction counter 3 calculates the flow rate pulse (lubrication value) from the memorized value (9.8 liters).
is subtracted and the stored value becomes 0 (when 9.8 liters of refueling is completed), the counter 3 generates an output (small flow refueling command) signal q. This signal q is applied to the motor control circuit 17, for example, to reduce the pump flow rate by controlling the rotation of the pump motor M, and is also applied to the switching circuit 19, whereby the switching circuit 19 changes the input signal g. does not generate an output signal h, but instead generates a signal h.
generate h′.

That is, when the signal q is generated as described above (0.2 liters) before the preset value (10 liters) and refueling is performed at a small flow rate, depending on the signal g from the comparator circuit 7, the switching circuit 19 Since signal h is not generated, therefore, the coexistence of signals h and i cannot occur, and the stop function does not work.

The flow rate pulse from the transmitter 1 is given to the subtraction counter 2, and is subtracted from the preset value stored there (10 liters in the above example). When the subtraction result becomes zero (refueling of 10 liters is completed), output s
occurs. This output is given to the motor control circuit 17 via the OR circuit 24 to stop the motor M.

The signal h' generated from the switching circuit 19 in response to the preset small flow rate refueling command signal q operates the subtraction counter 4. Prior to this, the subtraction counter 4 stores the set amount set by the setting circuit 32 (this set amount is a slightly larger amount than the set amount of the setting circuit 29, for example, 0.2 liters, for example, 0.21 liters). The flow pulse is subtracted from the stored value.

Since there is 0.2 liter remaining after refueling with a small flow rate, if refueling is stopped when this 0.2 liter is refueled, the subtraction value in subtraction counter 4 will be
Although it is 0.01 liter and no output h″ is generated,
If for some reason the refueling exceeds 0.2 liters and the subtraction value of subtraction counter 4 becomes zero, the output
h'' is generated. Therefore, when the next signal i is generated, an output k is generated from the AND circuit 20 and the motor M is stopped.

Since the signal k is also given to the AND circuit 23, the output u of the AND circuit 23 activates the alarm 30 due to its coexistence with the signal s.

In this type of refueling device, the nozzle is usually equipped with a so-called full-tank automatic refueling stop mechanism (auto-stop mechanism), but it is also possible to use such a nozzle with an auto-stop mechanism in the configuration of the present invention. Of course it is possible.

Note that 31 in the figure is a manual reset switch, which is used in the following cases. For example, when refueling a car's gasoline tank, once the refueling operation is completed, there is room in the gasoline tank and refueling is resumed, or multiple containers (for example, kerosene containers) are refueled one after another. 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 de-energized. Moreover, each time the nozzle is returned to the nozzle case, the counter is reset. This is inconvenient because the total amount of oil supplied is unknown.

In view of these inconveniences, the present invention provides a manual reset switch 3 that resets the pump motor M without resetting the counters 5, 11.
1 was established. By operating this switch 31, a reset signal f' is applied to the comparator 7, causing its output g and therefore the output k of the AND circuit to disappear, thereby canceling the stoppage of the energization of the motor M. That is, since motor M is energized again,
Refueling can be restarted by operating the nozzle valve. In this case, the reset signal f' from the manual reset switch 31 does not reset the counters 5, 11, so the amount of oil supplied after restarting is added to the amount of oil supplied up to the time of stop.

The reset signal f' is also applied to the subtraction counter 4 to prevent the generation of the output h'' due to repeated refueling as described above.

In the above embodiment, lubricating at a small flow rate is performed by reducing the rotation speed of the pump motor M, and stopping the lubricating is performed by deenergizing the motor M, but it is also possible that the lubricating flow path is narrowed or blocked. can.

As described above, according to the present invention, in a liquid supply device having a preset function and a stop function, the latter function does not interfere with the former function.
Both functions can be used effectively as needed to efficiently supply liquid.

[Brief explanation of the drawing]

FIGS. 1A and 1B are diagrams illustrating the disadvantages when the preset function and the stop function are used together, and FIG. 2 is a block diagram of an embodiment of the present invention. a~f, f', g, h, h', h'', i~n, n',
p, q, s, u...signal, M...pump motor.

Claims (1)

[Scope of Claims] 1. A pump supplies liquid to a liquid supply nozzle via a liquid supply path, and at the same time generates a flow rate pulse corresponding to the amount of liquid measured by a flow meter inserted in the liquid supply path. A liquid supply device equipped with a flow rate pulse transmitter has a preset circuit that presets the desired liquid supply amount or amount and outputs a corresponding signal, and a preset circuit that presets the amount of liquid to be supplied at a small flow rate. a small flow rate liquid supply amount setting circuit that outputs a signal to output a signal, and subtracting the output from the flow rate pulse generator from the difference between the output of the preset circuit and the output of the small flow rate liquid supply amount setting circuit until the difference becomes zero. a circuit that outputs a small flow rate liquid supply command signal q when the pulse width or period of the flow rate pulse from the flow rate pulse generator deviates from a predetermined range, and generates a small flow rate detection signal g. a circuit that adds the flow rate pulse from the flow rate pulse transmitter or the refueling amount pulse based on the flow rate pulse and outputs carry signals b and e to predetermined higher digits; and the small flow rate detection circuit. a circuit that generates a stop command signal k for stopping liquid feeding to the liquid supply nozzle in response to an AND condition between signal g and a carry signal; A liquid supply device comprising: a circuit for blocking input of the flow rate detection signal g to the stop command signal generation circuit.