JPH0723192B2 - Liquid supply device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a liquid supply device in which a valve is closed by a detection signal from a liquid level sensor.

[Prior Art] Such a liquid supply device has been proposed by the present applicant in Japanese Patent Laid-Open Nos. 58-41095 and 62-64799. According to the device, the control device outputs a control signal to the valve drive unit by the detection signal from the liquid level sensor to close the valve, that is, the flow rate control valve, and outputs a control signal to the motor to stop the motor and operate the pump. Stop and finish the liquid supply.
These proposals themselves are effective in that the liquid supply is stopped by the signal from the liquid level sensor.

However, during non-liquid supply, that is, when the nozzle is hooked on the nozzle, a power failure occurs and even if the customer manually drives the pump and tries to supply the liquid, the flow control valve is closed, so the liquid is supplied. There is a defect that cannot be done.

[Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide a liquid supply device capable of supplying liquid even if a power failure occurs at the start of liquid supply.

[Means for Solving the Problem] Therefore, according to the present invention, a pump, a flow meter,
A flow control valve is inserted in sequence, a hose with a liquid supply nozzle at the tip is connected to the flow control valve, a liquid level sensor is provided at the liquid supply nozzle, and an ON signal is issued when the liquid supply nozzle is removed, and an OFF signal is issued when the liquid supply nozzle is turned on. A valve control means that is provided with a nozzle switch and connects each of the above devices to a control device, and the control device closes the flow control valve by a liquid detection signal from a liquid level sensor and opens the flow control valve by an OFF signal from the nozzle switch. There is provided a liquid supply device having.

[Operation] When the liquid supply nozzle is removed, an ON signal is generated and the pump operates. At this time, the flow control valve is open, and the valve of the liquid supply nozzle is opened to supply the liquid. When the detection signal from the liquid level sensor is input, the flow control valve closes and the pump stops. When the liquid supply nozzle is applied, an OFF signal is emitted and the flow control valve opens. Therefore, even if there is a power outage at the start of liquid supply, the valve can be opened to manually drive the pump to supply liquid.

In practicing the present invention, it is preferable to open and close the valve with a stepping motor. With this configuration, the stopped position of the stepping motor can be retained and the valve can be opened even during a power failure.

In carrying out the present invention, the liquid supply is stopped and restarted several times, and the liquid supply is restarted after a certain period of time, for example, 3 seconds, and the discharge amount when the liquid supply is restarted is gradually reduced, for example, 45 → 35.
→ 20 → 3l / min, low discharge, eg 3l / min at the beginning of each liquid supply
Preferably. With this configuration, the liquid-supplied container can be filled up in a relatively short time.

In implementing the present invention, it is preferable to provide a liquid level sensor having a light emitter and a light receiver for detecting the liquid level and an insertion sensor for detecting that the nozzle has been inserted into the liquid supply port.

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

FIG. 1 shows a typical refueling device for carrying out the present invention. A refueling machine S contains a pump 2 driven by a motor 1, and this pump 2 sucks oil stored in a tank (not shown). It is adapted to suck up from the pipe 3 and send it to the discharge pipe 4. The discharge pipe 4 is provided with a meter 5 for measuring the flow rate and a flow rate control valve 6 for controlling the flow rate, and the discharge pipe 4 is connected to a fueling nozzle 8 via a hose 7. The flow rate signal from the meter 5 is sent from the transmitter 10 to the control device 11 as a pulse signal.
Then, it is sent from the control device 11 to the display device 12, and the amount of refueling is digitally displayed here, and the valve drive unit 13 is controlled by the signal from the control device 11 to turn on the flow control valve 6. It controls and controls the amount of refueling. The refueling nozzle 8 is provided with a liquid level sensor 14 for detecting the liquid level and an insertion sensor 15 for detecting that the refueling nozzle 8 has been inserted into a refueling port of an automobile. Further, the refueling machine S accommodates the refueling nozzle 8 therein. A nozzle switch 17 is provided to detect that the action has been taken. The sensors 14 and 15 and the nozzle switch 17 are connected to the control device 11 which is a control means.

The control device 11 is composed of a microcomputer, and in addition to a clock and a well-known control circuit, is provided with a storage device that stores the number of times of refueling stop and restart, and a flow rate pattern at each restart.

Next, the operation will be described mainly with reference to FIGS. 2 and 3.

FIG. 2 shows the basic control flow of the present invention.

The control device 11 determines whether or not the nozzle switch 17 is ON (step Sa), and outputs a control signal to the motor 1 if YES, that is, if the nozzle 8 is disconnected from the fueling machine S. To operate pump 2 (step S
b). In this state, the flow rate control valve 6 is opened in step Sj described later. Therefore, the valve of the oil supply nozzle 8 is opened to start oil supply. When a detection signal from the liquid level sensor 14 is input during refueling (step Sc), a control signal is output to the valve drive unit 13 to close the flow rate control valve 6 (step Sd), and a control signal is output to the motor 1. The operation of the pump 2 is stopped (step Se). Next, based on the signal from the nozzle switch 17, it is determined whether the refueling nozzle 8 is housed in the refueling machine S (step Sf), and YE
If it is S, a control signal is output to the valve drive unit 13 to open the flow rate control valve 6 (step Sj), and the control ends.

As described above, while the nozzle 8 is hooked on the nozzle, that is, while the fuel is not supplied, the valve 6 is open, so that the pump 2 can be manually supplied to supply oil even during a power failure.

FIG. 3 shows a control flow of an example to which the present invention is applied.

The control device 11 determines whether or not the nozzle switch 17 is ON (step S1). If YES, that is, if the nozzle 8 is removed from the fueling machine S, the insertion sensor is detected.
Based on the detection signal from 15, it is determined whether or not the nozzle 8 is inserted in the fuel filler port (step S2). If YES,
The flow control valve 6 which was opened by outputting a control signal to the valve drive unit 13 was narrowed down to a low discharge (for example, 3 l / min) (step S3), and a control signal was output to the motor 1 to turn the pump 2 on. Operate (step S4). Next, the valve of the oil supply nozzle 8 is opened to start oil supply, and it is determined based on the pulse signal from the transmitter 10 whether or not the amount of oil supply has reached 0.2 l (step S5). If YES, a control signal is output to the valve drive unit 13 to open the flow rate control valve 6 (for example, flow rate 45l /
min) (step S8), when the detection signal from the liquid level sensor 14 is input during refueling (step S10), the valve drive unit 1
A control signal is output to 3 and the flow control valve 6 is closed (step S11). Then, it is determined whether or not a fixed time (for example, 3 seconds) until the bubbles disappear (step S1
2) If YES, it is determined whether or not the liquid level is detected based on the detection signal from the liquid level sensor 14 (step S1
3). If YES, it means that the tank is full, so a control signal is output to the motor 1 to stop the operation of the pump 2 (step S1
5) Based on the signal from the nozzle switch 17, it is determined whether the refueling nozzle 8 is housed in the refueling machine S (step S16). If YES, output a control signal to the valve drive unit 13, open the flow rate control valve 6 (step S17),
End control.

The above shows the control flow in which the container is filled up by the refueling control with the predetermined refueling amount once and refueling is completed. However, if step S13 is NO, that is, the bubbles disappear after 3 seconds have elapsed in step S12. If the liquid level is not detected, it is determined based on the signal from the insertion sensor 15 whether or not the refueling nozzle 8 is inserted into the refueling port (step S14), and the refueling amount is determined by removing the refueling nozzle 8 from the refueling port. If yes, that is, if NO, move to step S15 to stop the operation of the pump 2, and if YES, open the flow control valve 6 slightly (3 l / min) (step S18), return to step S5, and restart fueling. , Step S
Repeat steps 5 to S13. According to a preferred embodiment of this repetitive control, in step S8, the flow rate is, for example, 45 l / min from the first time to 35 l / min, 20 l /
The opening amount of the flow rate control valve 6 is controlled so that the flow rate is gradually reduced to 3 min / min, and the oil supply amount is sequentially reduced. As a result, it is possible to refuel to a full tank in a relatively short time and without the liquid flowing out from the refueling port.

If step S5 is NO, that is, until the amount of refueling reaches 0.2 l, it is determined whether or not the liquid level is detected by the detection signal of the liquid level sensor 14 (step S6). Move to S11. If NO, insert sensor 15
Whether the refueling nozzle 8 is inserted into the refueling port is determined by the detection signal of (step S7).
If it is YES, the process returns to step S5 to continue refueling. If step S10 is NO, the insertion sensor 15
Whether the refueling nozzle is inserted in the refueling port is determined by the detection signal of (step S9), and if NO, step
Move to S11, and if YES, return to step S10 to continue refueling. In this way, steps S6, S7, S9, S1
At 0, S13 and S14, the liquid level is constantly detected and it is detected whether or not the refueling nozzle 8 is inserted in the refueling port to monitor the refueling state.

In the above control, the refueling end signal, that is, step Sf
And S16 are YES, that is, the control device 11 opens the flow control valve 6 (steps Sj and S17) by the OFF signal of the nozzle switch 17 in which the refueling nozzle 8 is housed in the refueling machine S after the refueling is completed. It is convenient because you can manually drive the pump to refuel even if there is a power failure.

[Effects of the Invention] According to the present invention, when the liquid supply nozzle is applied to the liquid supply device, an OFF signal is generated and the flow control valve opens. It is convenient and convenient.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an oil supply apparatus embodying the present invention, FIG. 2 is a basic flowchart diagram, and FIG. 3 is a control flowchart diagram of an example to which the present invention is applied. S ... Lubricant, 2 ... Pump, 5 ... Flow meter, 6 ... Flow control valve 8 ... Lubrication nozzle, 11 ... Control device 13 ... Valve drive unit, 14 ... Liquid level sensor 15 ... Insertion sensor, 17 ... Nozzle switch

Claims (1)

[Claims] 1. A pump, a flow meter, and a flow rate control valve are sequentially installed in the middle of the pipe, a hose having a liquid supply nozzle at the tip is connected to the flow rate control valve, and a liquid level sensor is provided at the liquid supply nozzle. A nozzle switch that emits an ON signal when the liquid nozzle is removed and an OFF signal when the liquid nozzle is turned on is provided, and each of the above devices is connected to a control device. from
A liquid supply device comprising valve control means for opening a flow control valve by an OFF signal.