JPS5993700A - Lubrication controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refueling control device used when refueling a vehicle such as an automobile with gasoline at a refueling station, and particularly when the refueling nozzle is not completely inserted into the refueling port of the vehicle.
The present invention relates to a refueling control device that prohibits refueling.

Various types of refueling devices have been known in the past, but for example, ground-mounted types usually respond by removing the refueling nozzle from the nozzle hook and automatically turn on the refueling pump drive. The configuration is such that the motor is started.

When the refueling pump is activated, the oil is pumped from the pump to the refueling nozzle via the hose, so it is ready for refueling at any time. That is, by inserting the refueling nozzle into the refueling port of a vehicle or the like and pulling the nozzle lever, refueling can be started immediately.

Therefore, if you accidentally pull the lever before completely inserting the refueling nozzle into the vehicle's refueling port, oil liquid will be sprayed from the refueling nozzle's outlet, resulting in a fire, explosion, or accident. There is a danger.

Furthermore, even after the refueling nozzle has been inserted into the refueling port and refueling has started, the refueling nozzle may not be fully inserted or may come off due to vibrations, creating the same risk of accidents. There is.

Further, in this type of conventional refueling device, the motor is operated even while the refueling nozzle is inserted into the vehicle's refueling port after being removed from the nozzle hook, resulting in a disadvantage that a large amount of electric power is wasted.

In addition, refueling is performed by the driver of the vehicle being refueled, rather than by a worker at a refueling station.In so-called self-service refueling systems, refueling is performed directly by a person who is not familiar with refueling. Therefore, there is a high probability that an oil leak will occur due to an erroneous operation before the oil supply nozzle is inserted into the oil supply port.

Therefore, there is a need for a control means that reliably prevents the discharge of oil from the refueling nozzle until the refueling nozzle is securely inserted into the refueling port.

For this purpose, for example, a light amount detection means is attached to the tip of the refueling nozzle, and when the refueling nozzle is inserted into the refueling port of the vehicle, the amount of light in that part decreases. Conventionally, there has been proposed a refueling control device that detects whether or not the refueling nozzle is completely inserted into the refueling nozzle, and prohibits discharge of oil from the refueling nozzle while the refueling nozzle is not inserted.

An example of such a conventional oil supply control device is shown in FIG.

In the figure, Rin and Rout are photosensitive resistors such as a photoconductor or a photoelectric conversion element made of a material whose resistance value changes depending on the amount of light received, and fixed resistors R1 and Rout, respectively.
2 in series, and these series circuits are connected in parallel to power supply E.

Therefore, the resistors R1, R2 and the photosensitive resistor Rin,
Rout constitutes a bridge circuit.

Further, Rln is irradiated with light from the tip of the refueling nozzle via the light guide 11, and ROut is irradiated with surrounding external light via the light guide 12. Therefore, signal voltages are generated at the connection points A and B of the bridge in accordance with the respective amounts of light.

The signal voltages at the connection points A and B are supplied to a differential amplifier 14. The output of the differential amplifier 14 causes the control contact 15 to
is controlled to open and close. The control contact 15 is the nozzle switch 1
6 and relay 17 are connected in series to power supply 18 .

Relay 17 controls power switch 20 of pump motor 1a.

During refueling operation, when the refueling nozzle is removed from the nozzle hook, the nozzle switch 16 is closed. However, until the refueling nozzle is inserted into the vehicle's refueling port, the light m transmitted and irradiated to the photosensitive resistors Rin and Rout via the light guides 11 and 12 is approximately equal, and normally R1 and R
Since the two resistance values are chosen to be equal, the signal voltages at points A and B are approximately equal.

Therefore, the output of the differential amplifier 14 is at low level,
Control contacts 15 remain open and therefore relay 17 is not energized. For this purpose, pump motor 1
a is also not driven, and even if the lever of the oil supply nozzle is pulled by mistake, no oil will be discharged.

When the refueling nozzle is completely inserted into the vehicle's refueling port, the amount of light shining on the photosensitive resistor Rin through the light guide 11 becomes sufficiently small, so that its resistance value becomes large and reaches the point Δ of the bridge. The resulting signal voltage is agitated. On the other hand, point B
The signal voltage of lυ hardly changes.

Therefore, the output of the differential amplifier 14 becomes high level, and the control contact 15 is closed. With this, relay 1
7 is activated and the pump motor 1a is driven, so that the oil is pumped to the oil supply nozzle, and the oil is discharged from the nozzle to perform oil supply.

As with the previous one, with the device shown in Figure 1, as long as the refueling nozzle is not completely pushed into the vehicle's refueling port, oil may be discharged even if the refueling nozzle is removed from the nozzle switch. Because there is no fuel tank, there is no risk of spilling oil liquid outside the vehicle's fuel tank.
Accidents such as scattering can be prevented.

However, it has been found that the apparatus shown in FIG. 1 has the following drawbacks.

In other words, in an inexpensive differential amplifier (comparator) that is commercially available and relatively easy to obtain, when either its inverting or non-inverting input approaches Ov (ground potential) or the upper limit (drive) voltage, It has characteristics that make it prone to malfunction.

Therefore, point A in the bridge circuit of FIG.

Examining the voltage at B 1 - Voltage Va at each point.

vb is expressed by the following formula.

The resistance value of the photosensitive resistor (for example, first to resistor) is
It is as small as 1 KΩ in bright daytime, but increases to about IOMΩ in darkness, such as at night.

Therefore, at night, the resistance value of the photosensitive resistor Rin attached to the tip of the refueling nozzle increases to about IOMΩ, and even if the resistance value of the fixed resistor R1 is selected to be between 10 and 20Ω, the voltage at point A Va.

The voltage becomes close to the power supply voltage E, which may cause malfunction.

To avoid this, if you choose a low power supply voltage E,
The voltage vb at 8 points during bright daytime is too low and Ov
, which may cause malfunctions.

The present invention has been made in view of the above circumstances, and its purpose is to ensure that the input voltage of a differential amplifier falls within a numerical range that makes its operation inaccurate, regardless of the brightness of the surrounding environment. An object of the present invention is to provide a refueling control device that can prevent this.

In order to achieve the above object, the present invention includes two light-sensitive resistors and two fixed resistors whose respective resistance values change depending on the tip of the refueling nozzle and other ambient light. A compensating resistor is inserted in series in the power supply circuit of the bridge, and the value of the compensating resistor is configured to change depending on the intensity of ambient light.

The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic side view of the appearance of the oil supply control device to which the present invention is applied.

In the figure, 1 is a refueling machine, with a motor 1a1 and a pump 1b.
, flow meter 10, pulse oscillator 1d, oil supply amount display meter le,
It is composed of a hose 1f, a nozzle hook 1tJ, a refueling nozzle 1h, a nozzle switch 111, and a nozzle lever 1.

Further, 2 is a motor 1a configured according to the present invention.
Rin is a light-sensitive resistor provided at the tip of the refueling nozzle 1h, and Rout is a part other than the tip of the refueling machine 1 (generally the refueling nozzle 1) for detecting external light. A photosensitive resistor, Rcom, provided at an appropriate location of
p is a compensating photosensitive resistor whose resistance value changes depending on the intensity of external light.

Reference numeral 3 designates a vehicle to be refueled, 4 designates its fuel tank, and 5 designates a refueling port of the fuel tank 4.

FIG. 3 is an enlarged side view of the refueling nozzle 111 portion in FIG. 2, and the same reference numerals as in FIG. 2 represent the same parts. Reference numeral 11 denotes a lead wire for connecting the photosensitive resistor Rin to the control circuit 2.

FIG. 4 is a block diagram showing an example of the control circuit of FIG. 2, and the same reference numerals as in FIGS. 1 and 2 represent the same or equivalent parts.

R3 is a fixed resistor connected in series with the bridge driving type 11uE, a photosensitive resistor Rcomp for external light compensation is connected in parallel with the resistor R3, 621 is a pulse oscillator, and 22.23 is a pulse counter. , 24 and 25 are AND gates, 26 are inverters, and 27 are flip-flops.

During refueling operation, when the refueling nozzle 1h is removed from the nozzle hook 1g, a signal indicating that the nozzle has been removed is output from the nozzle switch 11, and the nozzle switch 16 is closed. At this time, as will be clear from what will be described later, the control contact 15 is in the middle.

Until the refueling nozzle 1h is completely inserted into the vehicle's refueling port 5-, the difference between the brightness at the tip of the refueling nozzle 11) and the surrounding brightness is -0 below the set value, so the refueling nozzle The difference between the resistance value of the photosensitive resistor Rin provided at the tip of 1h and the photosensitive resistor Rout exposed to ambient light is less than the set value.

Therefore, the potential difference between points A and B of the bridge in FIG. 4 is also less than the set value. Therefore, the output of the differential amplifier 14 is at 1''-level, and AND GO 1 to 24 are closed.
Ando Goo 1-25 is in trouble. Pulse oscillator 2
The output pulse of 1 is supplied to the counter 23 via the output gate 25.

When the counter 23 counts a predetermined number of pulses, it generates an output and the flip-flop is reset. However, as described above, since the control contact 15 is open at this time, the relay 17 remains unenergized.

When the refueling nozzle 11+ is completely inserted into the refueling port, the brightness inside the refueling port 5 is sufficiently dark compared to the surrounding area, so the resistance value of the photosensitive resistor Rin is equal to the external photosensitive resistor R.
It is sufficiently larger than that of out.

As a result, a sufficiently large difference occurs between the potentials at points A and B on the bridge, and the output of the differential amplifier 14 becomes high level. This causes AND gate 24 to be heard and AND gate 25 to be closed.

The counter 22 counts the output pulses of the pulse oscillator 21 supplied via the AND gate 24, and produces an output when a predetermined value is reached. The output of the counter 22 is input to the terminal of the flip 70 knob 27 and is set.

Therefore, the control contact 15 is closed, the relay 17 is activated, the power switch 20 is closed, and the motor 1a is started. Therefore, if the nozzle lever 1k is pulled in this state, oil liquid is discharged from the tip of the fuel supply nozzle 1h, and the fuel tank 4 is refueled.

During refueling, if the refueling nozzle 111 is pulled out from the refueling port 5 and falls, or if refueling is completed and the refueling nozzle 1h is not pulled out, the initial state will return and the potential difference between points A and B of the bridge circuit will become small. Therefore, the output of the differential amplifier 14 becomes low level.

Therefore, AND gate 24 is closed and AND gate 2
5 opens. When the counter 23 counts a set number of pulse signals supplied through the AND gate 25, the flip-flop 27 is reset by the output.

As a result, the control contact 15 is opened, the motor 1a is stopped, and refueling is prohibited. Therefore, even if the nozzle lever 1k remains pulled, the oil is completely prevented from being discharged from the oil supply nozzle.

However, as described above in relation to the conventional example, when the refueling nozzle 111 is inserted into the refueling port 5 when the surroundings are sufficiently dark, such as at night, the resistance value of the photosensitive resistor Rin at the tip of the refueling nozzle 111 exceeds the limit. This may cause the voltage at point A of the bridge to become too high, causing malfunction of the differential amplifier 14.

In order to prevent the above-mentioned malfunction, in the present invention, a compensating photosensitive resistor RC0 for voltage division is connected in series with the bridge power supply E.
III) and a fixed resistor R3 are inserted to prevent the voltage at the point Δ from becoming too high.

The reason why the compensating resistor is made of parallel resistors such as the fixed resistor R3 and the photosensitive resistor Rcomp is as follows.

Assuming that only the fixed resistor R3 is connected in series with the power supply E, when the surroundings are dark, such as at night, the potential at point A will be prevented from rising too much, and malfunctions will not occur.

However, when the surroundings are bright, such as during the daytime, the potential at point B drops too much and approaches OV, causing the problem that the differential amplifier 14 is likely to malfunction.

Therefore, it is necessary to use a compensating resistor that has a high resistance value when the surroundings are dark and a low resistance value when the surroundings are bright.

For this reason, in the present invention, a parallel circuit of a fixed resistor R3 and a photosensitive resistor Rcomp is adopted as a compensation resistor, and when the surroundings are bright, a compensation effect can be obtained depending on the value of the photosensitive resistor Rcomp. When the surroundings are dark, a compensation effect can be obtained depending on the value of the fixed resistor R3.

In addition, in the above explanation, the motor 1a is
However, in place of the motor 1a, a clutch between the motor 1a and the pump 11),
Even if the shut-off valve, etc. between the pump ib and the oil supply nozzle 1h is controlled and the discharge of oil from the oil supply nozzle 111 is prohibited until the C1 relay 17 is activated, J
:It's obvious.

As is clear from the above explanation, according to the present invention, when the surrounding brightness is sufficiently bright such as during the daytime, of course /υ,
Even when the surroundings are very dark, such as at night, the input voltage to the differential amplifier (comparator) can be maintained at an appropriate value between the OV upper limit value, and an inexpensive commercially available differential amplifier can be used. Since it becomes possible to prevent malfunctions even when the device is in use, it is possible to have the great effect of reducing costs while guaranteeing reliable operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional oil supply control device.
Fig. 2 is a schematic side view of the external appearance of a refueling control device to which the present invention is applied, Fig. 3 is an enlarged side view of the refueling nozzle portion of Fig. 2, and Fig. 4 is an example of a control circuit in an embodiment of the present invention. It is a block diagram. 1...Refueling machine, 1a...Motor, 1b...Pump, 1[...Hose, 1g...Nozzle hook, 1h...
・Refueling nozzle, 11... Nozzle switch, 11 (...
・Nozzle lever, 2...control circuit, 3...automobile,
5... Fuel filler port, 14... Differential amplifier, 15... Control contact, 16... Nozzle switch, 17... Relay, 20... Power switch, 21... Pulse oscillator,
27...Flip-flop, Rin, ROut...
・Photosensitive resistance, Rcomp...Patent attorney representing photosensitive resistance for compensation: 1 person other than Michihito Hiraki

Claims (1)

[Claims] (1) Pump the oil through the hose,
A refueling control device for a refueling station in which refueling is discharged from a refueling nozzle provided at the tip of the hose, the device comprising: a first light amount detection means provided at the end of the refueling nozzle; and a first light amount detection means disposed at a location other than the refueling nozzle. a second light amount detection means provided;
and means for prohibiting discharge of oil from the oil supply nozzle when a difference between the amounts of light detected by the first and second light amount detection means is equal to or less than a set value, and the first and second light amount detection means A refueling control device characterized in that the refueling control device is connected to a power supply via a compensating resistor whose resistance value changes depending on the amount of light outside the refueling port. (a) A patented oil control device characterized in that the compensating resistor is composed of a photosensitive resistor and a fixed resistor connected in parallel to the photosensitive resistor.