JPS6323074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a refueling system.

Generally, in a refueling device, oil is pumped out from an oil storage tank and refueled through a refueling nozzle, and the amount of refueling and/or the amount of refueling is displayed. In this case, when the refueling nozzle is removed from the nozzle case provided in the refueling device housing, the pump drive motor is energized.
When the nozzle is returned to the nozzle case after refueling, the motor is deenergized, but the display does not return to zero immediately, but remains as it is, and does not return to zero until the next time the nozzle is removed from the nozzle case for refueling. It is normal for this to happen.

Incidentally, in recent years, a so-called POS terminal (hereinafter simply referred to as a terminal) has been connected to a refueling device at a refueling station to automatically process refueling information such as the amount of refueling. In this case, while the process is being carried out, the lubrication system is normally locked to disable the next lubrication operation, but this locking and unlocking can be done by locking and unlocking the pump drive motor. In this case, the power supply line to the motor is usually laid through the installation location of the terminal device or its vicinity, so a method is adopted in which this power supply circuit is opened and closed on the terminal device side.

However, if the refueling value (amount and/or amount) display is supplied with driving power via the pump drive motor energizing circuit, the terminal device must lock the refueling machine's pump motor. (If the energizing circuit is opened), there is a problem in that the power supply to the display is also cut off and the display disappears.

In order to solve this problem, it is possible to attach a locking wire for the pump motor from the terminal to the fuel supply machine, but in practice it is difficult to insert this wire into the protection pipe of the existing power supply line for the pump motor. In many cases, this is not possible, and digging up the ground is time-consuming and costly, and it is also unsightly, with traces of the trenches being backfilled.

In view of the above points, the first invention of the present application performs lock control of the pump motor by opening and closing the motor's energizing circuit, and furthermore, this lock control does not affect the display on the display at all. .

That is, the control circuit of the oil supply system according to the first invention includes a three-phase motor that drives the oil supply pump, and three power lines A, B, and C that connect this motor to a power source.
, a first switch that simultaneously opens and closes these power lines A, B, and C, a refueling information display device supplied with power by the power line, and a refueling nozzle corresponding to the non-refueling position and the refueling position. and a second switch that is opened and closed to open and close the first switch, and in which refueling information is processed by a POS terminal, the refueling information display is connected to two of the power lines. A series circuit of the control means for the second switch and the first switch is connected to the remaining power line A and one of the two power lines B and C. and connecting the power line A to the power line A closer to the power source than the first switch, respectively, and connecting a current detector to the power line A closer to the power source than the connection point of the series circuit, and when refueling the refueling nozzle. generating a corresponding nozzle position detection signal only when the current detector detects flow and stop of current in the power line A due to closing and opening of the second switch corresponding to the position and the non-refueling position; This is described above
A nozzle position detection signal generation circuit is also provided to the POS terminal, and a third circuit is provided in the power line A to open and close the power line in response to a motor lock signal and a motor lock release signal from the POS terminal, respectively.
The switch is connected closer to the power source than the first switch.

By the way, some terminals for refueling devices allow the motor to be unlocked regardless of whether the refueling nozzle is attached to or removed from the nozzle case once the refueling information processing is completed, and some allow the motor to be unlocked regardless of whether the refueling nozzle is attached to or removed from the nozzle case. However, the second invention of the present application adds a function to the structure of the first invention that can be carried out without any problem even in the case of a terminal with the latter structure. It is something that

That is, in addition to the configuration of the first invention, the control circuit for the oil supply device according to the second invention connects a parallel circuit to the power line A across the third switch, and the resistance of this parallel circuit is The value is set to a value that allows only a flow of current insufficient to close the first switch.

The illustrated embodiment will be described in detail below.

In Fig. 1, 1 is the housing of a ground-mounted refueling machine, 2 is an oil pumping pipe from an underground oil storage tank (not shown), 3 is a refueling pump, 4 is a drive motor for pump 3, 5 is a flow meter, and 6 7 is an oil supply hose, 7 is an oil supply nozzle, and 8 is a flow pulse generator that generates a number of flow pulses corresponding to the amount of oil measured by the flow meter 5. 9 is a nozzle case, and NS is a nozzle detection switch (second switch), which is connected to the nozzle case 9 and is used to detect whether the nozzle 7 is attached to or removed from the nozzle case 9 (i.e., whether the nozzle is in the non-refueling position or the refueling position). ), the contact NS _K (see Figure 2) is opened and closed. 10 is a display, L ₁ is a cable connecting the flow rate pulse transmitter 8 of the refueling machine 1 and the terminal, and L ₂ is a power supply cable for the motor 4.

Figure 2 shows a specific example of the electrical circuit, with DP showing the fuel dispenser side and POS the terminal side. Also IN
is a POS interface and constitutes a main component of the present invention. The same reference symbols in FIG. 2 as in FIG. 1 indicate corresponding components.

Cable _L1 sends the flow rate pulse to a predetermined circuit (not shown) in the terminal POS, where appropriate processing is performed.

Cable L ₂ consists of 3-phase power lines A, B, and C, and is connected to a suitable 3-phase power supply (not shown) to power motor 4.
energize.

The display device 10 is connected across two of the power lines A, B, and C, for example, B and C, and is supplied with driving power. MS is a magnetic switch connected to wires A, B, and C on the side of the motor 4 from the connection point between the display 10 and lines B and C, and I is a coil of the magnetic switch MS, and this coil I is a nozzle switch. In addition to being connected in series with NS, this series circuit SC is connected to the power line A (the power line to which the display 10 is not connected) on the power supply side of the magnetic switch MS.
and power line B (or C).

Therefore, when the nozzle 7 is removed from the nozzle case 9 (non-refueling position) (moved to the refueling position), the nozzle switch NS closes the series circuit SC and energizes the coil I, so the magnetic switch MS closes. The pump motor 4 is energized and oil supply becomes possible. Place nozzle 7 in nozzle case 9 (non-lubrication position)
When the nozzle switch NS is opened, the coil I is deenergized, the magnet switch MS is opened, and the motor 4 is deenergized.

The purpose of locking the motor 4 is to prevent the motor 4 from being energized even if the nozzle 7 is removed from the nozzle case 9 as described above. This is done by opening the main line (power line to which the display 10 is not connected) A on the power supply side from the magnetic switch MS. LR is a motor lock relay inserted into the power line A for this purpose, and the line L ₃ from the terminal
The relay contact LR _K is opened by a motor lock signal sent via the motor lock signal, and the contact LR _K is closed by a motor lock release signal.

Therefore, while the terminal POS is processing the refueling information after refueling is completed, if the contact LR _K of the relay LR is opened by the motor lock signal, the nozzle 7 can be removed from the nozzle case 9 and the nozzle switch can be turned on. Even if NS is closed, magnetic switch MS is not closed, so motor 4 is not energized (remains locked).

In this case, the motor lock is effected by opening the contact _LRK inserted into the line A, not the energizing lines B and C, of the display 10, so that the display on the display 10 does not disappear even when the motor is locked. Further, since all three power supply lines are opened in the magnetic switch MS by the motor lock, there is no danger that the motor 4 will be operated in a single phase by two power supply lines.

When the terminal POS finishes processing the refueling information, it gives a motor lock release signal and closes the contact LR _K of the lock relay LR, and then the nozzle switch NS is closed by removing the nozzle 7 from the nozzle case 9. If it is already removed, the nozzle switch NS is already closed)
Therefore, the magnetic switch MS is closed (the motor is unlocked) and the motor 4 is energized.

CD is a current detector connected to the power line A, and SG is a current detector connected to the power line A, and SG is a sensor that connects and disconnects the nozzle 7 from the nozzle case 9 in response to the detection operation of the detector CD (when the nozzle is in the non-refueling position or in the refueling position). This is a nozzle position detection signal generation circuit that generates a signal corresponding to As long as the motor 4 is not locked and the nozzle 7 is removed from the nozzle case 9, all contacts of the nozzle switch NS, magnetic switch MS, and motor lock relay LR are closed and current flows through the power line A. However, when the nozzle is hung on the nozzle case, the contacts of the nozzle switch NS are opened and the motor 4 is deenergized as described above, so that no current flows through the power line A. When this current stops, the detector CD
The nozzle position detection signal generation circuit SG sends the nozzle application signal (position signal when not refueling) to the terminal.
It gives commands to the POS to process refueling information, issue slips, generate motor lock signals, etc.

By the way, release the motor lock (lock relay)
LR contact LR _K (closing) can be done when the terminal has finished processing the refueling information or issuing the slip, but the terminal also releases the motor lock when the nozzle 7 is removed from the nozzle case 9 for the next refueling. If the condition is that the nozzle switch NS is removed (nozzle switch NS is closed), the above current detector CD
Therefore, it is not possible to detect that the nozzle switch NS is closed. This is because at this time, contact LR _K of lock relay LR remains open (motor lock state continues) and no current flows through power line A.

In view of this point, according to the present invention, a parallel circuit PC is provided across contact LR _K of motor lock relay LR.
is connected, and the resistance value of this circuit is selected so that when relay contact LR _K is open, only a weak current flows so that coil I of magnetic switch MS is not excited. This will remove the nozzle from the nozzle case and turn the nozzle switch NS.
When the relay contact LR _K is closed, a weak current flows through the power line A through the parallel circuit PC, so the current detector CD detects this and the nozzle position detection signal generation circuit SG responds accordingly. A nozzle removal signal (refueling position signal) is generated, and in response to this nozzle removal signal, the terminal generates a motor lock release signal to close contact LR _K of motor lock relay LR (release the motor lock).

When contact LR _K of motor lock relay LR is closed, a large current flows through coil I of magnetic switch MS, energizing it.
The contacts are closed and the motor 4 is energized.

The present invention is not limited to the above embodiments. For example, although the switches NS, MS, and relay LR have been described as having mechanical contacts, other suitable elements having a switching function, such as a non-contact switching circuit using a transistor, may also be used. Therefore, in this specification, a switch or a relay means a member or element having a switching function, and "opening/closing" means not only mechanical opening/closing but also electrical non-conduction and conduction.

Further, although the illustrated embodiment shows a ground-mounted refueling machine, the present invention can also be implemented in other types of refueling machines, such as ceiling-hanging refueling machines. In this case, the state (position) in which the refueling nozzle (refueling hose) is lowered for refueling and the refueling standby state (position) in which it is raised to a certain height above the ground are respectively the state in which the nozzle is removed from the nozzle case in the illustrated example. It can be regarded as corresponding to the state where it is hung on the nozzle case. In this case, the refueling hose elevation control switch performs the function of the nozzle switch NS in the illustrated example.

Furthermore, the term "nozzle case" is not limited to a container or case-like member that accommodates part or all of the nozzle, but may also refer to a "nozzle hanger" or "nozzle holder."

As described above, according to the present invention, the existing power line connecting the pump motor of the refueling machine and the power supply is used to drive the pump without affecting the display operation of the display of the refueling machine with a simple configuration. Motor lock control can be performed on the terminal side.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of a fuel supply apparatus to which the present invention is applied, and FIG. 2 is a diagram showing an example of an electric circuit used in the embodiment of FIG. 1. 2... Oil pumping pipe, 3... Oil supply pump, 4... Oil supply pump drive motor, 5... Flow meter, 8... Flow rate pulse transmitter, 9... Nozzle case, 10...
Display, POS...POS terminal, IN...Interface.

Claims (1)

[Claims] 1. A three-phase motor that drives a fuel pump, and three power lines A, B, and C that connect this motor to a power source.
, a first switch MS that opens and closes these power lines A, B, and C at the same time, a refueling information display device that is powered by the power lines, and a refueling nozzle that corresponds to the non-refueling position and the refueling position. and a second switch NS that is opened and closed by a switch NS to open and close the first switch, and in which refueling information is processed by a POS terminal, the refueling information display is connected to one of the power lines. straddling the two switches B and C, and a series circuit of the second switch and the control means I of the first switch.
SC is the remaining one of the power lines A and the two B,
A current detector CD is connected to the power line A closer to the power source than the first switch, and a current detector CD is connected to the power line A closer to the power source than the connection point of the series circuit SC. Only when the current detector detects flow and stop of current in the power line A due to closing and opening of the second switch corresponding to the refueling position and the non-refueling position of the refueling nozzle. Generate a nozzle position detection signal to
A nozzle position detection signal generation circuit is also provided to the POS terminal, and a third circuit is provided in the power line A to open and close the power line in response to a motor lock signal and a motor lock release signal from the POS terminal, respectively.
A control circuit for a refueling device, characterized in that a switch LR is connected and arranged closer to the power source than the first switch. 2. A three-phase motor that drives the oil pump and three power lines A, B, and C that connect this motor to the power source.
, a first switch MS that opens and closes these power lines A, B, and C at the same time, a refueling information display device that is powered by the power lines, and a refueling nozzle that corresponds to the non-refueling position and the refueling position. and a second switch NS that is opened and closed by a switch NS to open and close the first switch, and in which refueling information is processed by a POS terminal, the refueling information display is connected to one of the power lines. straddling the two switches B and C, and a series circuit of the second switch and the control means I of the first switch.
SC is the remaining one of the power lines A and the two B,
A current detector CD is connected to the power line A closer to the power source than the first switch, and a current detector CD is connected to the power line A closer to the power source than the connection point of the series circuit SC. Only when the current detector detects flow and stop of current in the power line A due to closing and opening of the second switch corresponding to the refueling position and the non-refueling position of the refueling nozzle. Generate a nozzle position detection signal to
A nozzle position detection signal generation circuit is also provided to the POS terminal, and a third circuit is provided in the power line A to open and close the power line in response to a motor lock signal and a motor lock release signal from the POS terminal, respectively.
A switch LR is connected and arranged closer to the power source than the first switch, a parallel circuit PC is connected to the power line A across the third switch, and the resistance value of this parallel circuit is set to the first switch. A control circuit for a refueling device, characterized in that the circuit is set to a value that allows only a flow of current insufficient to close a switch.