JPH0444996A - Oil supplier with oil type discriminating function - Google Patents

Abstract

PURPOSE:To enable instant and correct oil type discrimination at a time of oil supply by scavenging inside of a duct if temperature of vapor within a vapor duct reaches a prescribed value even when oil is not being supplied. CONSTITUTION:When inside gas density exceeds a prescribed value because of insufficient scavenging of inside of a vapor duct 21 at a finish of a preceding oil supply and vaporization of gasoline attaching to an inner wall surface of the vapor duct 21 while an oil supply nozzle 20 is hung on a nozzle hanger 8, generated vapor is detected immediately by a gas sensor (GS). The gas sensor (GS) outputs a detection signal, and a controller 5 excites immediately a switch valve V3 to turn over so that a large amount of air is made to flow into the vapor duct 21 to scavenge. When a prescribed time elapses, the controller 5 makes the switch valve V3 return back to be ready for a next oil supply.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a refueling device that determines the type of fuel oil to be refilled based on the fuel oil vapor remaining in the fuel tank of an automobile. However, more specifically, the present invention is directed to a refueling device with an oil type discrimination function, which is characterized in that it prevents mistakes in oil type discrimination caused by fuel oil vapor remaining in the detection side pipe or the like.

(Prior Art) There are two main types of fuel oil for automobiles: diesel oil and gasoline, and if you refuel with the wrong type of oil, it will cause problems for the engine.

For this reason, a device was proposed in Japanese Patent Publication No. 62-22879 in which a vapor suction port was provided at the tip of the discharge pipe of the refueling nozzle, and the gas sucked from the port was detected by a gas sensor to determine the type of oil in the fuel tank. It is proposed in the official gazette.

Some refueling devices equipped with this type of oil type discrimination function also blow air for several seconds after refueling to exhaust the vapor remaining in a part of the gas sensor. If the temperature is high, the vapor cannot be completely discharged from the pipe even after some air blowing, and if there is gasoline stuck to the pipe wall, even after blowing air for 70 minutes. Because vapor floats in the pipes, it can misidentify the type of oil when refueling from one time to the next, and in the case of a gasoline meter, it may be possible to refuel a vehicle using diesel oil, or the gas oil meter may In this case, not only does this cause the inconvenience of not being able to refuel vehicles using light oil, but in order to accurately determine the type of oil, it is necessary to hang the refueling nozzle on the nozzle hook and clean it. It also has the disadvantage of causing a loss of working time, such as having to perform the refueling operation again after performing the refueling operation.

(Problems to be Solved by the Invention) The present invention has been made in view of these problems, and its purpose is to constantly monitor the output value of the gas sensor even when not refueling, and to keep the output value constant. It is an object of the present invention to provide a new refueling device which performs air blowing when the oil level exceeds the oil level, and can immediately and accurately determine the type of oil at the time of refueling.

(Means for Solving the Problems) That is, the present invention provides a fuel supply device having an oil type discrimination function to achieve the above problems, and a vapor suction device that communicates with a vapor suction device and is partially equipped with a gas detection device. a conduit;
The gas scavenging means scavenges the inside of the vapor conduit in response to a gas detection signal from the gas detection means even when no refueling is being performed.

(Function) With this configuration, even when not refueling,
When the vapor in the vapor conduit reaches a certain concentration, the inside of the conduit is scavenged to maintain the equipment normally and to avoid interfering with the oil type discrimination performed immediately before refueling.

(Tora example) Therefore, the illustrated embodiment will be explained below.

FIG. 1 shows the oil supply amount M, which is a simple embodiment of the present invention.

In the figure, reference numeral 1 denotes a refueling pump that supplies fuel in an underground tank to a refueling nozzle 20, to which one end of a refueling hose 3 is connected via a flow meter 2.
is provided with a flow rate pulse transmitter 4, and the signal from this is configured to be converted by a control device 5 into a refueling amount and displayed on a display 6.

Reference numeral 10 denotes an air supply source, and an air conduit 11 extending from this source is connected to normally closed valves V, V2 via a mist separator 12 and a regulator 13, as shown in FIG.
and a 3-bottom 2nd position switching valve V3 are connected in parallel, and the first well V1 roughly faces into the groove insertion recess 9 of the nozzle holder 8 through the vacuum holder 14. tania nozzle 1
5, and the second valve v2 is connected to a vapor conduit 21, which will be described later, via a variable throttle valve 16, and the second valve v2 is connected to a vapor conduit 21, which will be described later, through a variable throttle valve 16.
3, both conduits 11.
It is arranged at the connection part of 21.

On the other hand, as shown in FIG. 3, the vapor conduit 21 described above enters the fuel supply device from a vapor suction port 23 opened near the tip of the cylinder tip 22 of the fuel supply nozzle 2o through a stop valve 25 that is opened by a lever 24. , here the gas sensor GS, the pressure switch PS, and the above-mentioned switching valve V3'! It communicates with the vacuum ejector 14 via the vacuum ejector 14 .

By the way, the above-mentioned first and second valves V, V2 and switching valve v
3 are configured as electromagnetic valves that are operated by an output signal from the control device M5, and the 10th valve V is a flow path of the air conduit 11 leading from the air supply source 10 to the vacuum ejector 4 by being excited. is opened and the inside of the pepper conduit 21 connected to the vacuum ejector 14 is made negative pressure to perform a vapor suction action, and the second valve V2 is energized with the first valve vI demagnetized to remove vapor. A small amount of air from the air supply source 10 is introduced into the conduit 21 to perform a vapor evacuation action, and the rough switching valve v3 connects the vapor conduit 21 and the vacuum ejector 14 when not energized.
During excitation, the vapor conduit 21 and the air supply source 10 are switched to the b position where they are communicated with each other, and a large amount of air from the air supply source 10 is introduced into the vapor conduit 21 to forcefully scavenge the inside. is configured to do so.

In addition, a pressure switch PS installed in the middle of the vapor conduit 21
The switch is configured with a diaphragm that deforms when the inside of the conduit 21 becomes negative pressure to turn on the switch.

Incidentally, the reference numeral 27 in the figure indicates that one end is the cylinder tip 2 of the refueling nozzle 20.
The figure shows a well-known air suction pipe that opens at the tip of 2 and operates the automatic valve closing mechanism 28 by the negative pressure generated when it is blocked by liquid in the fuel tank. In the figure, 29 is the main valve, and SW is the main valve. Each nozzle switch provided on the nozzle hook 8 is shown.

Next, the operation of the apparatus configured as described above will be explained based on the flowchart shown in FIG.

When the refueling nozzle 20 is removed from the nozzle hook 8, the nozzle switch 5Wi (tON turns on (step I), and the control bag M5
returns the display 6 to zero and energizes the first valve V to open it (step RO). As a result, air from the air supply source 10 flows into the vacuum ejector 14 and is The inside of the connected vapor conduit 21 is made negative pressure.

On the other hand, since the lever 25 is still lowered at this point, the stop valve 25 provided in the middle of the vapor conduit 21 remains closed. Therefore, a strong negative pressure acts inside the vapor conduit 2, and the pressure switch PS detects this negative pressure and turns on (step c).

Under this condition, next, the cylinder tip 22 of the refueling nozzle 20 is
When inserted into the car's fuel tank and pulled the lever 24,
When the main valve 29 is opened, the stop valve 25 is opened by the lever 24 to increase the pressure in the vapor conduit 21 and eliminate the signal from the pressure switch PS.
.

In this state, the air flowing through the air conduit 11 creates a negative pressure in the vapor conduit 21, so the vapor in the fuel tank is sucked into the gas sensor GS.

The control device I5 receives the signal from the gas sensor GS when a certain period of time T+, for example, 3 seconds has elapsed since the signal from the pressure switch PS disappears (Step E), and determines the type of fuel oil in the fuel tank. At this point, the vapor in the fuel tank has certainly reached the gas sensor GS, and therefore the type of fuel oil contained in the fuel tank can be immediately determined.

If the result of the determination is that the oil type matches the pre-registered oil type of the oil supply device (Step 1), the 10th valve V is closed, the second valve V2 is opened, and the pump motor M is started ( Step Ch). As a result, a small amount of air in the air conduit 11 flows from the second valve v2 through the variable throttle valve 16 into the vapor conduit 21 to create a weak positive pressure inside, and during the refueling operation, fuel flows into the vapor conduit 21. This prevents oil from entering and scavenges the inside of the vapor conduit 21 to prevent deterioration of the gas sensor GS.

In this way, when the fuel supply amount reaches a predetermined value and the lever 24 is pulled down, the main valve 29 closes the pipe line and cuts off the supply of fuel oil, and at the same time, the stop valve 25 closes the pipe line of the vapor conduit 21. Close. Next, when the refueling nozzle 20 is set on the nozzle hook 8 and the nozzle switch SW is turned OFF (step re), the control bag N5 turns off the pump motor M (step re), and then the second valve V2 is turned off. is demagnetized to close the inflow of air from here (step), and the switching valve v3 is energized and switched from position a to position b (step). As a result, the air in the air conduit 11 is A large amount flows into the vapor conduit 21 and the stop valve 2
The check valve 26 provided at 5 is opened to release the remaining vapor into the atmosphere together with air, and at the same time, the gas sensor GS is cleaned with fresh air. Then, when a certain period of time T2, for example 5 seconds has passed (step wo),
Demagnetize the switching valve V and return it to the original position a (
Step W), put it in standby mode for the next refueling.

On the other hand, when the refueling is completed, there is insufficient scavenging in the vapor conduit 21, and while the refueling nozzle 20 is hung on the nozzle hook 8, the inside of the vapor conduit 21 is removed. When gasoline adhering to the surface evaporates and the gas concentration inside reaches a certain value or more, the generated vapor is immediately detected by the gas sensor GS (step SO).

When a detection signal is output from the gas sensor GS, the control device M5 immediately excites the switching valve v3, switches it to position b (step ne), and flows a large amount of air into the vapor conduit 2 to perform scavenging and maintain a constant level. When the time T2 has elapsed (step wo), the switching valve v3 is returned to its original position (
Step 1) Put the machine in the condition for refueling.

On the other hand, due to insufficient scavenging, the refueling nozzle 2 is closed for the next refueling.
o is removed from the nozzle hook 8, and along with this, the first valve v
1 is opened and the pressure switch PS is turned on (
Step c) When vapor in the vapor conduit 21 is detected by the gas sensor GS (step C), the control device 5 receives the detection signal from the gas sensor GS and immediately demagnetizes the first valve v1. While closing this, the second valve v2 is energized to open it, and the air conduit 11
The air flowing inside is caused to flow from the second valve v2 through the variable throttle valve 16 into the vapor conduit 21, and the vapor generated inside is discharged, and the alarm 7 is activated to alert the operator (step YO). ).

As a result, when the operator inserts the refueling nozzle 20 into the nozzle hook 8 again, the nozzle switch SW is turned OFF.
(Step ta) The alarm 17 steps to stop its operation), and as a result, the second valve v2 is closed (Stable), and the switching valve V3 is energized and switched to position b (Step ta). Therefore, a large amount of air in the air conduit 11 flows into the vapor conduit 21, and the vapor remaining inside is discharged to the outside. Then, when the predetermined time T2 has elapsed (step wo), the switching valve V3
is returned to position a again, and is returned to the standby state for refueling with (step w). Then, if it is determined that the oil type is different in step (G),
The following steps are performed in English.

(Effects) As described above, according to the present invention, the output of the gas detection means is monitored even when refueling is not performed, and when the vapor in the vapor conduit reaches a certain concentration, the interior of the vapor conduit is scavenged. Therefore, it is possible to maintain the equipment normally at all times so as not to interfere with the oil type determination that is performed immediately before refueling, and at the same time prevent deterioration of the gas detection means caused by vapor generated when refueling is not performed. It can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a refueling snowmaking system showing one embodiment of the present invention, Fig. 2 is a pipe line block diagram showing the main parts of the same device, and Fig. 3 is a schematic diagram showing an embodiment of the refueling nozzle. FIG. 4 is a flowchart showing the operation of the above device. 1... Refueling pump 3... Refueling hose 5... Control device 8... Nozzle hook 20... Refueling nozzle 25... Stop valve v2... Gasket 2's Valve SW... Nozzle switch 2... Flow meter 4... Flow rate pulse transmitter 6... Display] 1... Air conduit 21... Vapor conduit V,... ...First valve V3...Switching valve PS...Pressure switch GS...Gas sensor

Claims (1)

[Claims] A vapor conduit communicating with a vapor suction means and partially equipped with a gas detection means, and a scavenging means for scavenging the inside of the vapor conduit in response to a gas detection signal from the gas detection means even when refueling is not performed. Refueling device.