JP2579611B2 - Refueling device with oil type discrimination function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for determining the type of fuel oil to be replenished based on a fuel oil vapor remaining in a fuel tank of a motor vehicle, and more particularly to a fuel supply system. The present invention relates to an oil supply device with an oil type discriminating function which prevents an oil type discrimination error caused by a vapor of fuel oil remaining in a conduit.

[0002]

2. Description of the Related Art Fuel oil for automobiles is roughly classified into two types, light oil and gasoline. If the oil type is incorrectly refueled, the engine will be inconvenient. For this reason, Japanese Patent Publication No. Sho 62-22879 discloses a device in which a vapor suction port is provided at the tip of a discharge pipe of a refueling nozzle, and gas suctioned from the nozzle is detected by a gas sensor to determine the type of oil in the fuel tank. Proposed.

[0003] Some refueling apparatuses having this kind of oil type discriminating function are configured to perform air blowing for several seconds after the refueling is completed to discharge the vapor remaining in the gas sensor portion. If the air is blown, the vapor cannot be completely discharged from the pipeline even if air blow is performed. Since the evaporated vapor floats in the pipeline, this will cause the oil type to be incorrectly determined at the next refueling, and in the case of a gasoline meter, it will be possible to refuel a vehicle using light oil.
In the case of a light oil metering machine, on the other hand, it may cause inconvenience such as disabling fueling for vehicles using light oil, and in order to perform more accurate oil type discrimination, once apply the fueling nozzle to the nozzle hook and perform scavenging. There is an inconvenience that a work time is lost such that the refueling operation must be performed again after the operation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
Gas is detected by the gas sensor, and when the sensor output value exceeds a certain level, air is introduced into the vapor conduit for a certain period of time, and the air inside the vapor conduit is efficiently reduced with the least amount of air. An object of the present invention is to provide a new refueling device that performs scavenging.

[0005]

That SUMMARY OF THE INVENTION As oil supply device provided with an oil type discrimination function for the present invention to achieve the foregoing object, the vapor conduit having a vapor suction means and a gas detecting means, the interior of the vapor conduit Scavenging means to scavenge
Before starting refueling, set the scavenging means to negative pressure
After the refueling is started, the scavenging means should be connected to the air supply source shortly.
Control means for intermittently connecting is provided .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows an oil supply device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a refueling pump for supplying fuel in an underground tank to a refueling nozzle 20, to which one end of a refueling hose 3 is connected via a flowmeter 2. , A flow rate pulse transmitter 4 is provided, and a signal from the transmitter is converted into a refueling amount by a control device 5 and displayed on a display 6.

[0007] 10 is an air supply source, the air duct 11 extending from here, as shown in FIG. 2, a mist separator 12 and the first valve normally closed through the regulator 13 V ₁
And a second valve V ₂ forming a 3-port 2-position switching valve are connected in parallel, and the first valve V ₁ is further connected to the inside of the cylinder tip insertion recess 9 of the nozzle hook 8 via the vacuum ejector 14. The second valve V ₂ is connected to the air supply source 10 through the fixed orifice 16,
In the position, the connection between the vapor conduit 21 and the vacuum ejector 14, which will be described later, is established. In the position b, both the conduits 1 are connected so as to enable the connection between the air conduit 11 and the vapor conduit 21.
1 and 21 are provided at the connection portions.

On the other hand, as shown in FIG. 3, the above-mentioned vapor conduit 21 passes through a stop valve 25 which is opened by a lever 24 from a vapor suction port 23 opened near the tip of a cylinder tip 22 of a refueling nozzle 20, and is supplied with a refueling device. reaches within, here via a second valve V ₂ and the pressure switch PS mentioned above and the gas sensor GS extends into the vacuum ejector 14.

By the way, the first and second valves V ₁ , V
_{Numeral 2} denotes an electromagnetic valve which is operated by an output signal from the control device 5. The first valve V ₁ is a flow path of the air conduit 11 from the air supply source 10 to the vacuum ejector 14 by being excited. , And a negative pressure is applied to the inside of the vapor conduit 21 connected to the vacuum ejector 14 to perform a suction operation of the vapor, and the second valve V ₂ connects the vapor conduit 21 and the vacuum ejector 14 in the normal state in the non-excited state. It is in the position a to be communicated, and after the oil type is determined and after the supply of oil is stopped, it is switched to the position b in response to an intermittent signal and a continuous signal output from the control device 5 for a certain period of time, thereby communicating the vapor conduit 21 with the air supply source 10. Then, the air from the air supply source 10 whose flow rate is reduced by the fixed orifice 16 is introduced into the vapor conduit 21 to forcibly scavenge the inside.

On the other hand, the pressure switch PS provided in the middle of the vapor conduit 21 is configured as a switch which is turned on by a diaphragm which is deformed when the pressure in the conduit 21 becomes negative. Indicates a well-known air suction pipe that activates the automatic valve closing mechanism 28 by negative pressure when the opening end of the refueling nozzle 20 on the cylinder tip 22 side is closed by the liquid in the fuel tank.
Reference numeral 9 denotes a main valve, and SW denotes a nozzle switch provided on the nozzle holder 8.

Next, the operation of the above-configured apparatus will be described with reference to the flowchart shown in FIG. When the oil supply nozzle 20 is removed from the nozzle hook 8, the nozzle switch S
W is turned ON (step b), the control unit 5 opens this by exciting the first valve V ₁ with thereby zero the display 6 (step b). Thereby, the air from the air supply source 10 flows into the vacuum ejector 14,
The inside of the vapor conduit 21 connected here is set to a negative pressure.

On the other hand, since the lever 24 is still lowered at this point, the stop valve 25 provided in the middle of the vapor conduit 21 is closed. For this reason, a strong negative pressure acts in the vapor conduit 21 and the pressure switch PS
Detects this negative pressure and turns on (step c).

In this state, the oil supply nozzle 20
Of the cylinder 2 into the fuel tank of the automobile and
When 4 is pulled, the stop valve 25 is opened by the lever 24 together with the opening of the main valve 29. Thereby, the vapor conduit 21
The strong negative pressure in the gas rapidly disappears, the pressure switch PS is immediately turned off (step d), and vapor is sucked from the fuel tank into the vapor conduit 21 and flows to the gas sensor GS. Go on.

When the vapor reaches the gas sensor GS without fail, the type of the fuel oil contained in the fuel tank is immediately determined here. When the detection output from the gas sensor GS becomes equal to or more than a certain value in accordance with the oil type (step E), the control device 5 captures this signal,
Thereby closing the first valve V ₁ intermittently opening the second valve V _2, to start fueling and to start the pump motor M at the same time (step f).

[0015] Thereby, the air conduit 11 is connected to the refueling.
The inside air flows into the vapor conduit 21 from the second valve V ₂ , but as described above, the flow of the air from the air supply source 10 is reduced by the fixed orifice 16 on the way.
Furthermore, since the valve V ₂ is narrowed down by intermittent opening and closing,
The air injected in the form of a pulse forms a uniform and small amount of air in the process of flowing through the long vapor conduit 21 toward the refueling nozzle 20 and forms a low positive pressure in the conduit 21 to remove dangerous vapor from the fuel tank. The inside of the vapor conduit 21 is tentatively scavenged with an amount of air that does not flow out much, thereby preventing the gas sensor GS from deteriorating.

When a constant scavenging effect is obtained in this manner for a time T ₁ , for example, 3 seconds, ventilation is performed (step
G), which restore refused then energization of the second to the valve V ₂ (step h). Thereby, refueling can be continued without wasteful waste of air and without extra leakage of dangerous vapor. Finally, when the refueling amount reaches a predetermined value and the lever 24 is pulled down, the main valve 29 closes the line to cut off the supply of the fuel oil, and at the same time, the stop valve 25 closes the line of the vapor conduit 21. Then, the refueling nozzle 20 is set on the nozzle holder 8, and the nozzle switch SW is turned off.
F (step リ), the control device 5 turns off the pump motor M (step ヌ), and then the second valve V
₂ is energized and switched from the a position to the b position again (staple).

As a result, the air in the air conduit 11 flows into the vapor conduit 21 again, opens the check valve 26 provided in the stop valve 25, and discharges the vapor remaining there into the atmosphere together with the air. The gas sensor GS is completely cleaned with fresh air. Then, when a predetermined time T ₂ , for example, 5 seconds has elapsed (step ヲ), the second valve V
₂ is demagnetized to return it to the original a position (step w), and put into a standby state for the next refueling.

On the other hand, if the fuel oil contained in the fuel tank is, for example, light oil and is different from the oil type registered in the fueling device, for example, gasoline, the fueling nozzle 20
Is inserted into the fuel tank of the vehicle and the lever 24 is pulled, the gas sensor GS does not output a gasoline level detection signal. In such a case, the control device 5 controls the gas sensor GS even after a certain time T ₃ , for example, 2.5 seconds, elapses.
With the detection signal above a certain level is not input from the (step f), while closing it immediately demagnetized first valve V _1, it is switched on intermittently b position of the second valve V ₂ The air flowing through the air conduit 11 is supplied to the second valve V _2.
Then, the vapor flows into the vapor conduit 21 in a pulsed manner, and the vapor remaining inside is discharged by the small amount of air, and the alarm 7 is operated to call the operator's attention (step y). Then, for a certain time T ₄ (step
Data) For example, if three seconds has elapsed, turned down the power supply to the second valve V ₂ to stop the scavenging in the vapor conduit 21 (Step Les).

On the other hand, when the operator knows the operation error and returns the refueling nozzle 20 to the nozzle hook 8 again by the operation of the alarm 7, the nozzle switch SW is turned off (step S), and the alarm 7 stops operating. Stop (step
Tsu), and the second valve V ₂ Along with this is switched to the b position from the excitation has been a position (step le). Therefore, when the inside vapor conduit 21 to discharge the vapor remaining inside flows air in the air conduit 11 to the outside, the predetermined time T ₂ has elapsed (step Wo), a second valve V
₂ is returned to the position a again (step w), and is returned to the standby state for the next refueling.

[0020]

As described above, according to the present invention, refueling
Before starting, connect the scavenging means to the negative pressure generating means and start refueling.
After that, connect the scavenging means to the air supply intermittently for a short time
So, insert the nozzle into the supply port of the fuel tank
A large amount of air in the vapor conduit under previous safe conditions
To safely and completely scavenge its interior
Allows for more accurate oil type discrimination, while refueling
Dangerous vapors are drained from the fuel tank as much as possible.
Immediately clean the sensor after detection without deterioration
And complete vapor on the inner wall of the vapor conduit
Oil type discrimination performance over a long period of time
It is possible to keep it well, and furthermore, before starting refueling
The subsequent scavenging is executed by a switching operation by the control means.
This eliminates the need for a special pipeline configuration
Such a device can be simply configured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an oil supply device showing one embodiment of the present invention.

FIG. 2 is a pipeline configuration diagram showing a main part of the same device.

FIG. 3 is a sectional view of a main part showing one embodiment of a fueling nozzle.

FIG. 4 is a flowchart showing an operation of the above device.

[Explanation of symbols]

1 oil pump 2 flow meter 3 refueling hose 5 control device 7 alarm 8 nozzle hanger 11 air conduit 20 the fueling nozzle 21 vapor conduit 25 stop valve V ₁ first valve V ₂ second valve SW nozzle switch PS pressure switch GS Gas sensor

Claims (1)

(57) [Claims] 1. A scavenger for scavenging the inside of a vapor conduit provided with vapor suction means and gas detection means.
Before starting refueling, the scavenging means
To the negative pressure generating means, and after the start of refueling, the scavenging means
Control means to connect the air supply to the air supply
A lubricating device characterized by being radiated.