JPH0117955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refueling device that can measure weight and display the amount of refueling.

For example, a refueling device for refueling an automobile with oil such as gasoline uses mechanical means, such as a piston cylinder device with a fixed capacity, and measures the stroke of the piston to display the amount of refueling. Therefore, wear and leakage in the piston cylinder device will be displayed as an error in the amount of oil supplied.

Other conventional techniques include, for example, JP-A-55-
There is a technique disclosed in Publication No. 154290. This technology includes a tank, a weighing means for weighing the tank, and a calculating means for calculating a supply amount from the output of the weighing means. However, in this conventional technology,
Replenishment work is troublesome because there is no built-in replenishment device for the service tank. Therefore, in order to reduce the number of times of refueling, the capacity of the service tank increases, and the overall size of the refueling system increases. Therefore, a separate oil supply device such as a pump device is required when replenishing the tank.

Japanese Patent Publication No. 46-33272 discloses a technique in which refueling from a storage tank and replenishment of fuel to the storage tank can be performed using the same pump.
However, in this technology, the flow path is switched between refueling and refueling by connecting the replenishment hose, so it is necessary to connect the replenishment hose each time refueling, which makes the work cumbersome. be.

The present invention was proposed in view of the problems of the prior art described above, and the amount of oil to be supplied is determined by determining the weight of oil whose specific gravity is known in advance, without using a mechanical flow rate measuring device that is prone to errors. The aim is to provide a refueling device that can.

The oil supply device of the present invention includes a service tank that temporarily stores oil from the oil storage tank, a weight scale that measures the weight of the service tank, and an amount of oil that is supplied from the service tank in response to a signal from the weight scale. A refueling amount indicator that displays the amount of oil, a refueling nozzle, a pump for replenishing oil from the oil storage tank to the service tank and from the service tank via the refueling nozzle, and a pump that connects the suction side of the pump to the oil storage tank or the service tank. A first switching valve that connects the discharge side of the pump to either the service tank or the refueling nozzle, and a second switching valve that connects the discharge side of the pump to either the service tank or the refueling nozzle. a switch that sends a signal when the refueling nozzle is removed from the refueling machine body, and a first switching valve that operates in response to a signal from the switch when the refueling nozzle is removed from the refueling machine body to connect the suction side of the pump and the service tank; The first switching valve is operated to connect the discharge side of the pump with the refueling nozzle, and the first switching valve is activated on the suction side of the pump in response to a signal from the switch when the refueling nozzle is connected to the main body of the refueling machine. and a control device that connects the pump discharge side and the service tank by operating the second switching valve.

According to the present invention, a service tank is used to measure weight, and the difference between the weight of the service tank before refueling and the weight of the service tank during refueling is measured, and the weight difference is determined by referring to the specific gravity of the oil. is converted into volume, and the amount of refueling is then displayed.

In carrying out the present invention, a load cell is used as a scale for measuring weight. Supplying oil from an underground oil storage tank to a service tank is usually done when the service tank is not supplying oil to a vehicle.

When the refueling nozzle is removed from the refueling machine body during refueling, the switch generates a signal in response, and based on that signal, the control device operates the first and second switching valves to switch from the service tank to the first. An oil path is formed from the switching valve → pump → second switching valve → oil supply nozzle, and the oil in the service tank can be supplied. When the refueling operation is completed and the refueling nozzle is hung on the refueling machine body, the switch generates a signal in response, and based on that signal, the control device operates the first and second switching valves again to stop the oil storage. An oil path is configured such as tank → first switching valve → pump → second switching valve → service tank, and oil can be replenished from the oil storage tank to the service tank.

In the present invention, the service tank whose weight is measured can be downsized, so the entire refueling device does not need to be enlarged, and the accuracy in weight measurement can be improved. Further, in the present invention, since the first and second switching valves are operated by unhooking and unhooking the refueling nozzle from the nozzle hook, the flow path can be easily switched between refueling operations and refueling operations.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a refueling apparatus embodying the present invention, in which a service tank 2 is provided in a refueling station 1, and a weighing scale, that is, a funnel cell 3 in the illustrated embodiment, is provided at the bottom of the service tank 2. . Therefore, the weight of the service tank 2 and the oil stored therein is measured by the load cell 3. On the other hand underground tank 4
A first switching valve 6, a pump 7, and a second switching valve 8 are connected in series to the oil supply pipe 5 extending from the fuel supply pipe 5.
The first switching valve 6 and the lower part of the service tank 2 are connected through a pipe 9, and the second switching valve 8 and the upper part of the service tank 2 are connected through a pipe 10. Furthermore, a pipe 11 from the second switching valve 8 is connected to a nozzle valve 12 via a hose 17. In the figure, reference numeral 13 indicates a switch for detecting whether the nozzle is on or off, 14 indicates an oil supply amount indicator, 15 indicates an oil amount indicator in the service tank, and 16 indicates a control device to be described later.

Next, the operation of the present invention will be explained with reference to FIG.

First, when the automobile is not being refueled, the pump 7 is controlled by the control device 16 as described later.
operates to suck up oil from the underground tank 4 through the pipe 5 and the first switching valve 6 and from the second switching valve 8.
Oil is supplied to the service tank 2 through a pipe 10. And service tank 2 with load cell 3
The weight of the oil inside is measured, and the weight signal from the load cell 3 is transmitted to a memory circuit 20, an arithmetic circuit 21, and a management circuit 25 via a line _L1 .

To refuel a car, the nozzle valve 12 is removed by hooking the nozzle. Then, a signal indicating that the nozzle valve has been removed from switch 13 is sent to line L ₂ .
This signal is transmitted from line L ₂₁ to storage circuit 20
The previous memory of the memory circuit 20 disappears,
The current weight value of the load cell 3 is stored in the storage circuit 20. Further, the gate _G1 is opened by a signal from the line _L22 , and the oil supply amount display signal from the first arithmetic circuit 22 is transmitted to the oil supply amount display meter 14. As will be described later, when the nozzle is removed from the nozzle hook, the oil supply amount display signal from the arithmetic circuit 22 is zero, and zero is displayed on the oil supply amount indicator 14. The signal from line L ₂ is also applied from line L ₂₃ to a first switching valve 6 which switches to connect pipe 9 to pump 7 . Furthermore, the signal from line L ₂₄ provides an activation signal to pump 7 through gate G ₃ .
Furthermore, the signal from line L ₂ is transmitted via line L ₂₅ to the second switching valve 8, which
The oil from the pump 7 is switched to flow into the pipe 11. Therefore, when the nozzle valve 12 is removed from the nozzle hook, the pump 7 is started and the oil in the service tank 2 is transferred to the pipe 9, the first switching valve 6, the pump 7,
Nozzle valve 1 via second switching valve 8 and pipe 11
From 2 onwards, refueling becomes possible and zero is displayed on the refueling amount display meter 14. When the nozzle valve 12 is opened and refueled, the memory circuit 20 is stored in the second arithmetic circuit 21.
The numerical value stored in (for example, 100000g)
The weight signal transmitted from the load cell 3 via the line _L1 is sequentially subtracted, for example, in units of 1 g (for example, if the load cell 3 indicates 98576 g, then 100000-98576=1424 g).

This subtracted signal from the second arithmetic circuit 21 is sent to the first arithmetic circuit 22 via line _L4 . A conversion signal L ₅ from a conversion value transmitting circuit 23 is applied to the first arithmetic circuit 22 . This conversion value transmitting circuit 23 transmits the reciprocal of the specific gravity of the oil in the service tank (for example, in the case of gasoline, it is (10/7)), and the first arithmetic circuit 22 multiplies it (1424 ×10/7=2034c.c.=2034), and this signal is displayed on the refueling amount display meter 14 via the first gate _G1 (for example, the third decimal place is rounded down).
2.03) be done. Since the weight signal from the load cell 3 is transmitted, for example, every 1 g, the oil supply amount indicator can sequentially display the oil supply amount, for example, every 0.01.

The process of refueling the car is completed as described above,
When the nozzle valve 12 is put on the nozzle hook, a signal indicating that the nozzle valve is put on the line _L6 is generated from the switch 13, and the signal on the line _L2 disappears.
Therefore, the pump 7 is stopped, the first and second switching valves 6 and 8 are switched, and the pipe 5, the first switching valve 6, the pump 7, the second switching valve 8, and the pipe 10 are removed from the underground tank 4. A pipe line is configured to feed the service tank 2 through the service tank 2. Further, the gate _G1 is closed and the display on the oil supply amount indicator 14 is maintained as it is until the next time the nozzle is removed from the nozzle hook. The signal from line _L6 on the other hand is applied to gate _G2 , _which opens. The weight of the service tank 2 is applied to the service tank oil amount management circuit 25 via the line _L1 , and this management circuit 25 controls when the weight of the service tank 2 falls below a predetermined value (for example, 100,000 g). signal on line L ₇ , gate G ₂ ,
A start signal is sent to pump 7 via line L ₈ .

After refueling, hang the nozzle on the nozzle hook,
The gate G ₂ is opened, the pump 7 is operated in response to a signal from the management circuit 25, and the service tank 2 is supplied with oil from the underground tank 4. Service tank 2
When the tank is full (for example 100000g), line L ₇
The signal disappears and the pump 7 stops. Preparations for refueling the next vehicle are then completed.

Now, suppose that the amount of oil in the service tank 2 approaches zero while refueling the car. A signal is then generated from the management circuit 25 on line _L8 .
Since this signal closes the gate _G3 , the pump 7 is stopped and the fuel supply is stopped. To refuel further, hang the nozzle valve 12 on the nozzle hook, and the service tank 2 will be refilled with oil from the underground tank 4.
You can refuel your car again.

Further, in order to display the amount of oil in the service tank 2, a circuit similar to that for displaying the amount of oil to be supplied is configured. That is, the weight signal from the line _L1 is sent to the third calculation circuit 24, where it is multiplied by the value from the converted value transmission circuit 23, and the remaining amount in the service tank 2 is displayed on the liquid level indicator 15. . Therefore, the remaining amount of oil in the service tank 2 is always displayed. Note that it is preferable that the weight signal of the load cell indicates a value obtained by subtracting the weight of the service tank 2 itself in advance.

As described above, according to the present invention, the weight of the service tank 2 is measured and the amount of refueling is displayed. Therefore, unlike the conventional device that measures the volume using a mechanical device, there is no error due to leakage or wear and tear, and the amount of oil supplied is displayed. If the specific gravity of the liquid is known, there will be no error and the amount of refueling can be accurately displayed. Therefore, according to the present invention, the amount of refueling can be displayed accurately over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an oil supply system embodying the present invention, and FIG. 2 is a block diagram showing an example of a control device embodying the present invention. 2... Service tank, 3... Scale (load cell), 4... Underground tank, 6, 8... Switching valve, 7
……pump.

Claims (1)

[Claims] 1. A service tank that temporarily stores oil from the oil storage tank, a scale that measures the weight of the service tank, and an oil supply amount display that displays the amount of oil supplied from the service tank in response to a signal from the scale. a pump for replenishing oil from the oil storage tank to the service tank and from the service tank via the refueling nozzle;
A first switching valve that communicates the suction side of the pump with either the oil storage tank or the service tank, a second switching valve that communicates the discharge side of the pump with either the service tank or the fuel supply nozzle, and the fuel supply nozzle that communicates with the fuel supply nozzle. A switch that sends a signal depending on the operation of removing the refueling nozzle from the main body of the refueling machine and the operation of applying the refueling machine, and a first switching valve that operates in response to a signal from the switch when the refueling nozzle is removed from the main body of the refueling machine, and a switch that operates on the suction side of the pump. and the service tank, and actuates the second switching valve to connect the discharge side of the pump and the refueling nozzle. The switching valve is operated to connect the suction side of the pump and the oil supply tank, and the second switching valve is operated.
1. A refueling device comprising: a control device that operates a switching valve to establish communication between a pump discharge side and a service tank.