JP2610540B2 - Refueling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lubricating apparatus that prevents a vehicle's lubricating tank from being erroneously lubricated with an oil liquid of a type different from that of a vehicle. The present invention relates to a refueling device having a so-called oil type identification function.

[Conventional technology]

Conventionally, as this type of lubrication system, Japanese Patent Application Laid-Open No. 64-84895
As described in the publication, the gas sensor can detect the presence or absence of gas by focusing on the fact that the saturated vapor pressure differs between gasoline and light oil, and the electrical characteristics change according to the gas concentration of the fuel gas. (For example, a semiconductor gas sensor).

In this refueling device, the atmosphere in the fuel tank of the vehicle to be refueled is sucked and applied to a gas sensor provided in the refueling device main body, and based on the electrical characteristic output of the gas sensor at that time, the oil type of the vehicle and Whether or not the type of the oil liquid to be refueled matches is identified, and the refueling is permitted or prohibited.

According to the refueling device described in the publication, the type of oil in the tank is identified by detecting that the output of the gas sensor has exceeded a predetermined first level. It is determined that the gas sensor has been inserted into the fuel filler of the tank of the vehicle to be refueled. Thereafter, within a predetermined time, the output of the gas sensor has exceeded a second level larger than the first level, or after a predetermined time has elapsed. Also determines whether the oil type of the vehicle is gasoline or light oil by not exceeding the second level.

And detecting the fact that the output of the gas sensor has exceeded a predetermined first level, the tip (discharge pipe) of the refueling nozzle is inserted into the refueling port of the fuel tank to be refueled. Then, it is determined whether the oil type of the vehicle is gasoline or light oil by determining whether the output change value of the gas sensor after a lapse of a predetermined time is greater than a third level. I do.

Like that.

[Problems to be solved by the invention]

However, in the conventional oil supply device with the oil type identification function having such a configuration, the output level of the gas sensor when detecting gasoline vapor has a large difference from the output level of the gas sensor in the atmosphere in the atmosphere. Since the output level of the gas sensor when light oil vapor is detected does not differ much from the output level of the gas sensor in the atmosphere in the atmosphere,
There were the following problems.

That is, in the case of identifying light oil, after detecting that the output of the gas sensor has exceeded the predetermined first level, the gas level does not exceed the second level (ie, the gasoline determination level) even after a predetermined time has elapsed. 'After that, the output change value of the gas sensor after a lapse of a predetermined time becomes a third level (ie, a gasoline determination level).
Smaller, must be done on the basis of.

For this reason, in the above-mentioned configuration ', it takes time to determine the light oil, and even if a light oil fueling nozzle is inserted into the oil filler opening for refueling the light oil vehicle, the oil refueling is not easily started and the refueling is not started. There is a problem that it takes a long time to start.

This is due to the fact that there is not much difference between the output level of the gas sensor when gas oil vapor is detected and the output level of the gas sensor in the atmosphere of the atmosphere. After inserting the refueling nozzle into the refueling port, by waiting for a predetermined time to elapse that the oil liquid in the fuel tank is not gasoline, it is reliably determined,
This is because it is performed indirectly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a refueling device that shortens the time of oil type discrimination by directly performing oil type identification of gasoline and light oil by time management. The purpose is to do.

[Means for Solving the Problems] In order to achieve the above object, the feature of the configuration adopted by the oil supply device according to the present invention is that the detection signal output from the oil vapor detection means is taken in every minute time, A signal difference calculating means for calculating a difference between the captured value and the current captured value, and a range for each oil type for determining whether or not the signal difference obtained by the signal difference calculation is within a predetermined range for each oil type. When the determination means and the respective range determination means determine that each signal difference is within a predetermined range, the number of times is counted, and when the number of counts reaches a predetermined number continuously, the oil in the fuel tank is counted. Oil type determining means for each oil type for determining the seed, oil type checking means for checking whether the oil type determined by each oil type determining means matches the oil type supplied from the oil supply nozzle,
When the oil type matching means determines that the oil types match, oil supply control means for controlling oil supply by the oil supply nozzle is provided.

[Action]

With this configuration, the signal difference calculation means
The detection signal is taken from the oil vapor detecting means at every minute time, for example, every 500 msec by the detection interruption processing, and the signal difference between the previous value and the current value is calculated. On the other hand, in the refueling processing side routine, the range determining means for each oil type determines whether the calculated signal difference is within a predetermined range for each oil type, and the oil type determining means includes: When the respective signal differences are determined to be within a predetermined range by the respective range determining means, the number is counted, and when the counted number reaches the predetermined number continuously, the oil type in the fuel tank is gasoline. Determine whether it is or light oil. In this way, when the oil type in the fuel tank is determined by the oil type determining means by the detection operation repeated every predetermined minute time, the oil type determined by the oil type collating means is supplied from the fueling nozzle of the measuring machine. If the oil type matching means determines that the oil type matches, the oil supply control means permits the operation of the pump motor, the opening / closing valve, etc., and allows oil supply by the oil supply nozzle. And On the other hand, when the oil type collating unit determines that the fuel in the fuel tank does not match the oil type supplied from the refueling nozzle, the refueling control unit prohibits the refueling operation.

〔Example〕

Hereinafter, a case where the oil supply device of the present invention is applied to a fixed oil supply device will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows an overall configuration diagram of a fueling apparatus used in the present embodiment. In FIG. 1, reference numeral 1 denotes a fixed-type weighing machine provided on the premises of a gas station, and 2 denotes a weighing machine provided in the weighing machine 1. A pump 4 and a flow meter 5 driven by a pump motor 3 are provided in the middle of the pipe 2, and a flow pulse oscillator 6 for transmitting a flow pulse proportional to the flow rate is mounted on the flow meter 5. I have.

Reference numeral 7 denotes a hose whose base end is connected to the pipe 2. Reference numeral 8 denotes a refueling nozzle provided at the distal end of the hose 7. When the refueling nozzle 8 is opened, the oil liquid is supplied from the discharge pipe 8a to the fuel tank. Can be discharged.

Reference numeral 9 denotes a nozzle storage portion provided on a side surface of the weighing machine 1, and a refueling nozzle 8 is attached to and detached from the nozzle storage portion 9.
The nozzle housing 9 is provided with a nozzle switch 10 that opens and closes in conjunction with the refueling nozzle 8 being engaged and disengaged, and outputs a nozzle switch signal indicating that refueling is being performed during closing.

An intake hose 11 is provided along the hose 7 as a vapor suction pipe, and one end of the intake hose 11 is connected to a refueling nozzle 8.
And extends to the discharge pipe 8a to form a steam suction port 11a. The other end extends to the inside of the weighing machine 1 and opens to form a steam discharge port 11b. The steam suction port 11a can be configured as a metal air collecting cylinder or the like surrounding the discharge pipe 8a of the oil supply nozzle 8, and the steam discharge port 11a
11b may also serve as a suction / discharge port of an intake pump described later.

Next, reference numeral 12 denotes a gas sensor serving as oil vapor detection means provided in the measuring machine 1 and provided in the middle of the intake hose 11. The gas sensor 12 detects the vapor concentration of oils in the fuel tank as described later. It detects the oil type. Here, the gas sensor 12 is configured as a semiconductor gas sensor whose resistance value changes according to the type of hydrocarbon such as gasoline and light oil, and can detect a change in resistance value as a change in output voltage.

13 is a vapor discharge port of the intake hose 11 which is located in the weighing machine 1.
11b, the suction pump 1 of the present embodiment.
Reference numeral 3 denotes a forward / reverse rotatable motor and a gas pump driven by the motor, which is capable of intake and exhaust (both not shown)
So that oil vapor is sucked into the weighing machine 1 from the steam suction port 11a side through the intake hose 11 at the time of normal rotation, and the air inside the weighing machine 1 is discharged to the steam suction port 11a side at the time of reverse rotation. Has become. The suction pump 13 constitutes the vapor suction means of the present invention when rotating forward, and constitutes the exhaust means of the present invention when rotating reversely.

Reference numeral 14 denotes a refueling amount indicator provided on the front panel of the weighing machine 1, and the refueling amount indicator 14 is, as shown in FIG.
Refueling amount display 15 consisting of six large displays, refueling amount display 16 consisting of six medium displays, refueling unit price display 17 consisting of four small displays, located on the front left side 5
A mode indicator 18 composed of vertically arranged lamps.
At the time of a regenerating operation or the like, flickering is performed in a predetermined operation order, and the operator is notified of the oil type detection state by the operation mode.

Further, reference numeral 19 denotes a control device provided in the weighing machine 1. The control device 19 is constituted by, for example, a microcomputer or the like, and its input side is connected to the flow rate pulse oscillator 6, the nozzle switch 10, the gas sensor 12, and the like. The output side is connected to the pump motor 3 via a motor drive circuit (not shown), and is connected to a refueling amount indicator 14. The storage area of the control device 19 stores the programs shown in FIGS. 3 and 4, and various comparison data values, counters, and the like for executing the programs.

The present embodiment is constructed as described above. Next, the operation will be described with reference to FIGS. 3 and 4. FIG.

First, a detection interruption process of a detection signal from the gas sensor 12 will be described with reference to FIG.

This detection interruption processing is executed by, for example, a timer interruption processing every 500 msec. In step SP1, the detection data d of the gas sensor 12 is read, and in the next step SP2
Is the detection value difference per unit time from the previous detection data d '.
DIV is calculated and stored as DIV = d-d '(1). And the next step
In SP3 DIV Do greater than a predetermined error constant E ₁ (DIV ≧
E ₁ ), and if the determination is “YES”, the process returns to step SP 1 to reject the detection data d. Note that the detection data is obtained after A / D conversion of an analog voltage signal output from the gas sensor 12, and therefore, when external noise is superimposed on the analog signal of the gas sensor 12, this is taken as detection data. This is a so-called error confirmation process of the detected data to prevent the data from being inserted. Also, "NO" in step SP3
If the determination is, the detected data is normal data, so in the next step SP4, the current detected data d is replaced with the previous detected data d '.
To be stored. Further, when this processing ends, the detection flag SF is set to “1”, and the interruption processing ends. Here, the significance of the detection flag SF will be described. The above-described detection interruption processing is executed by, for example, a timer interruption processing every 500 msec, whereas the refueling processing shown in FIG. 4 described later is far more than this interruption processing. In a short time (for example, 20 msec), the program cycle on the first floor ends. Therefore, the detection flag SF is used to prevent the refueling process from being performed many times for the same detection data by one detection interrupt process, and to take a correspondence between the detection interrupt process and the refueling process. What is used.

Now, with respect to the refueling process using the weighing machine 1, the fourth
A description will be given based on the drawings.

First, steps S1 to S8 in FIG. 4 (a) are preliminary steps for starting the refueling process. When the refueling nozzle 8 is removed from the nozzle housing portion 9 to start the refueling operation, the nozzle switch 10 is turned on in step S1. Is turned “ON”, and in the next step S2, the intake pump 13 rotates forward. In this step S2, the intake pump 13
Is activated, in the next step S3, the lamps of the mode indicator 18 in the refueling amount indicator 14 are cyclically lit, for example, from top to bottom, thereby indicating the suction state. Then, in the next step S4, a timer (not shown)
Is started, and in step S5, it is monitored whether or not this timer has elapsed t ₁ sec. The time set by the timer, t
₁ is set to be much shorter than the time normally required for the refueling nozzle 8 to be inserted into the fuel tank, and until the detection operation of the gas sensor 12 becomes stable. Then, when setting the timer time t ₁ has elapsed at step S5, the detection value difference DIV by detection interrupt processing at the next step S6
There is monitored whether or not it is smaller than a predetermined very small voltage value k _1. Incidentally, the voltage value k ₁ is intended to see whether the output voltage of the gas sensor 12 is stabilized. Furthermore, the detection data d in step S7, it is determined whether a predetermined smaller extremely than small voltage value k _2. This voltage value k ₂ is the voltage value, i.e. a value close to the voltage value output from the gas sensor 13 at atmospheric pressure which is output prior to insertion of the fuel supply nozzle 8 to the fuel tank. Therefore, when it is determined as “NO” (d> k ₂ ) in step S7, it is highly likely that the oil vapor remaining in the intake hose 11 at the time of the previous metering is detected, and the sensor abnormal state or Step S43 described later as an error state
When the determination is "YES", the process proceeds to step S8 because the gas sensor 12 is in a normal state. This step S8
Then, the output voltage d from the gas sensor 12 at this point is set as the offset data OD. Here, the offset data OD is a voltage value serving as a measurement reference output from the gas sensor 12 before the discharge pipe 8a of the fueling nozzle 8 is inserted into the fueling port of the fuel tank.

The above is the description of the preparatory stage of the refueling process immediately after the refueling nozzle 8 is removed from the nozzle accommodating portion 9. Next, FIG.
The insertion detection step of inserting the fueling nozzle 8 into the fuel tank in steps S9 to S19 shown in FIG.

First, in step S9, it is determined whether or not the detection flag SF is "1". When it is determined that the detection flag SF is "NO" (FS = 0), the detection flag SF is reset in step S19 to be described later, and the data is loaded this time. Since the refueling process has already been performed for the detection data d, the process proceeds to step S10. If it is determined in step S10 that the nozzle switch 10 is "OFF", the refueling nozzle 8 is not actually refueled.
Is applied to the nozzle accommodating section 9, and the process proceeds to step S46 described later. On the other hand, when it is determined to be “YES” in step S10, a waiting loop is performed until new detection data d is acquired by the next timer interrupt processing.

When it is determined (YES) (SF = 1) in step S9, the acquired detection data d is new data, so the process proceeds to the next step S11 to monitor whether a predetermined time t ₂ sec has elapsed. to. the predetermined time t ₂ fueling nozzle 8 was removed is the time required to determine the state of being left alone without being inserted into the fuel tank, for example, t ₂ = 30 sec is set. Then, If "YES" is determined in this step S11, since 30 seconds have elapsed without performing the refueling work, the process proceeds to step S40 described below, and "NO"
Is determined, in the next step S12, it is compared whether the detection data d is larger than the offset data OD (d> OD). This is a process for determining whether the detection data d is appropriate.
When it is determined to be “NO” (t ≦ OD), the acquired detection data d proceeds to step S19 as inappropriate data, while when it is determined to be “YES” (d> OD), it proceeds to the next step S19.
At 13, the output voltage value D of the gas sensor 12 is calculated as D = d-OD (2).

Furthermore, in step S14 (2) the output voltage value D calculated by the equation compares whether greater than the predetermined voltage value k _3,
When it is determined as “YES” (D> k ₃ ), the process proceeds to step S20, and when it is determined as “NO” (D ≦ K ₃ ), the process proceeds to step S15.
The process proceeds, the output voltage value D (1) the output value difference DIV per unit was calculated time in expression comparing whether greater than the predetermined voltage value k _4. Here, the predetermined voltage value k ₃ at step S14 the value appropriate for determining whether to insert the refueling nozzle 8 to the fuel tank, corresponding to the first level described in the prior art. The predetermined voltage value k ₄ is a small positive value than the voltage value k _3, the relationship of the following equation.

k ₃ > k ₄ > 0 (3) Thus, when it is determined “YES” in step S14, it means that the insertion detection of the refueling nozzle 8 has been performed. On the other hand, comparing whether the output value difference DIV at step S15 when it is determined "NO" in the step S14 is greater than a predetermined low voltage value k _4. Now, "NO" (D
When it is determined that IV ≦ k ₄ ), it is unknown whether or not insertion detection is being performed. Therefore, the insertion detection counter IC (not shown) is reset to “0” and “YES” (DIV> k ₄₎ ), The insertion detection is possible, that is, a state in which the output voltage of the gas sensor 12 shows a change even if the oil vapor concentration is low, such as light oil. the IC is added only processes "1", it determines whether the count value of the insertion detecting counter IC in the next step S18 has reached a predetermined insertion detection identification number n _1, for example, n ₁ = 5 times. When it is determined "YES"(IC> n ₁₎ in the above step S18, assuming that the insertion detecting a fueling nozzle 8 was performed, the process proceeds to step S20. On the other hand, step S18
When it is determined as “NO” (IC <n ₁ ), the detection flag SF is reset to “0” in step S19, the process returns to step S9, and the same processing as described above is performed, and a determination of “YES” is made in step S18. Repeat until Note that the process of resetting the detection flag to "0" in step S19 is because it is sufficient to perform one insertion detection process for one detection interrupt process, and the program cycle of the refueling process is about 20 msec. On the other hand, the program cycle of the insertion interrupt processing is about 500 msec, and this is for matching between the two.

The processing at the insertion detection stage has been described above. Next, the processing at the oil type stage will be described with reference to steps S20 to S35 shown in FIG.

First, in step S20, it is monitored whether the detection flag SF is "1". If "YES" is determined, the new detection data d is fetched, so the next step S21
The process proceeds, the detection value difference DIV is compared whether greater than a predetermined voltage value k _5. Here, the voltage value k ₅ is the lowest reference voltage per unit time suitable to determine as gasoline.
Then, the gasoline determination counter G in the next step S22 when it is determined "YES"(DIV> k ₅₎ in step S21
C (not shown) is incremented by "1", while the heavy oil discriminating counter LC (not shown) is reset to "0" in the next step S23, and the routine proceeds to step S24, where the gasoline discriminating counter GC sets a predetermined value. Gasoline determination circuit N ₂ , for example, determines whether n ₂ = 3 times. In this step S24, “NO” (GC <n
_If determined to be ₂ ), the process proceeds to step S33 and the detection flag is set.
After resetting SF to "0", the process returns to step S20, and waits for SF to become "1" by the detection interrupt processing, and repeats the processing of S20 to S24 and S33 in the same manner as described above. And step
When it is determined in S24 that "YES" (GC = 3) has been reached, the process proceeds to step S25, in which the gasoline flag GF is reset to "1", and it is determined that the fuel tank to be refueled this time is gasoline.

On the other hand, when it is determined as "NO" (DIV ≦ k ₅₎ in step S21, the process proceeds to step S26, the detection value difference DIV is compared whether less than a predetermined voltage value k _6. Where the voltage value
k ₆ is the highest reference voltage per unit time that is suitable for determining a gas oil. Then, in this step S26, "YES" (DI
If it is determined that V <k ₆ ), the light oil discriminating counter LC is incremented by “1” in the next step S27, while the gasoline discriminating counter GC is reset to “0” in the next step S28, and the process proceeds to step S29. Then, it is determined whether or not the light oil determination counter LC has reached a predetermined number of light oil determinations n ₃ , for example, n ₃ = 4. After resetting the detection flag SF to "0" the process proceeds to step S33 when it is determined "NO" in step S29 (LC <n _3), the process returns to step S20, SF is the detection interrupt processing "1" Wait for S20, S21,
The processes of S26 to S29 and S33 are repeated. When it is determined that "YES" (LC = 4) has been reached in step S29, the process proceeds to step 30, the light oil flag LC is set to "1", and it is determined that the fuel tank to be refueled this time is light oil. I do.

Further, when it is determined as “NO” (DIV ≧ k ₆ ) in step S ₂₆ , the detection value difference DIV per unit time is k ₅ ≧ DIV ≧ k ₆ (3) in relation to step S 21. It is not possible to distinguish between gasoline and light oil. Therefore, in this case, the process proceeds to step S31 to reset the gasoline determination counter GC to “0”, and also proceeds to step S32 to reset the light oil determination counter LC to “0”, and then sets the detection flag SF to “0” in step S33. After "0", the process returns to step S20.
Therefore, even if each of the discrimination counters GC and LC is advanced halfway, when each of the discrimination counters GC and L is halfway when the detection value difference DIV per unit time is in the relationship of the equation (3).
C will be reset.

Thus, oil type discrimination of this embodiment, gasoline, in relation to the voltage value k _5, k _6, which is set for each gas oil and the detection value difference DIV, continuous count of gasoline discrimination counter GC, gas oil discrimination counter LC Only when the number of times reaches n ₂ , n ₃ , the oil type is determined, and each oil type is directly and independently identified. When the gasoline flag GF is reset to "1" in step S25 and the light oil flag LC is set to "1" in step S30, the process proceeds to step S34, in which the normal rotation of the intake pump 13 is stopped, and refueling is performed in step S35. Quantity indicator 14
The display of the suction state by the mode indicator 18 in the inside is stopped.

The oil type has been identified as described above. Next, the processing in the refueling stage will be described with reference to steps S36 to S46 shown in FIG.

First, in step S36, steps S25 and S30 described above are performed.
It is checked whether or not the oil type in the fuel tank determined in step 1 matches the oil type to be refueled by the refueling nozzle 8 of the weighing machine 1. Now, if "YES" is determined in step S36, it is a compatible oil type that can be refueled, so the process proceeds to step S37 to start the pump motor 3 and drive the pump 4. As a result, when the metering machine 1 keeps the refuelable state and the refueling nozzle 8 is opened, the gasoline in the underground tank is refueled from the refueling nozzle 8 via the pipe 2, the pump 4, the flow meter 5, and the hose 7. You. When the desired refueling amount is reached, close the refueling nozzle 8 and
If the fuel tank is pulled out, refueling is completed (step S3
8). Then, in step S39, the fuel supply nozzle 8 is hooked on the nozzle storage section 9 so that the nozzle switch 10
F ". Then, if it is determined “YES” in step S39, it means that all the refueling work has been completed, and the process proceeds to step S46 to perform the cleaning process.

Here, the cleaning process is for exhausting residual oil vapor in the intake hose 11 and drying the scum sensor 12, and is performed by reversing the intake pump 13. During this time, the mode indicator 18 of the refueling amount indicator 14 displays the exhaust state by illuminating each lamp sequentially, for example, from bottom to top. This cleaning process is the same when it is determined “NO” in step S10.

On the other hand, when it is determined “NO” in the above-described step S36, the oil type does not match the oil type in the fuel tank to be refueled, and the refueling is prohibited. Therefore, in this case, the process proceeds to step S40, in which all the lamps of the mode display 18 are simultaneously displayed to indicate that the oil type is incorrect. Then, the operator visually recognizes the oil type error display and checks the oil supply nozzle 8.
Switch on the nozzle housing 9
When 10 becomes “OFF” (step S41), the mode indicator
The indication of the oil type error by 18 was stopped, and the
Then, the cleaning process is performed. This operation is the same when “YES” is determined in step S11.

Further, when it is determined as `` NO '' in the above-described step S7, that is, when it is determined that the sensor is abnormal because the cleaning process is insufficient and the oil vapor at the time of the previous measurement remains in the suction hose 11, Proceeding to step S43, all lamps of the mode display 18 are turned on and off alternately.
Then, the operator visually recognizes the sensor abnormality and puts the refueling nozzle 8 on the nozzle housing portion 9 to thereby switch the nozzle switch 10.
Becomes "OFF" (step S44), the mode indicator 18
Stops the sensor error display due to the
Then, the cleaning process is performed.

The embodiment of the present invention is as described above, in which the detection data d from the gas sensor 12 is sampled at every minute time by the detection interruption processing, and the oil type is determined by the number of samplings. Not only can be shortened, but also because gasoline and light oil are independently and directly discriminated, the detection operation is reliable.

The detection interruption processing shown in FIG. 3 is a specific example of the signal difference calculating means according to the present invention, and steps S21 and S2 in FIG.
6 is a specific example of the range determining means for each oil type, and the step S22
S25 and S27 to S30 are specific examples of the oil type determining means for each oil type, step S36 is a specific example of the oil type checking means, and steps S37 to S39 are specific examples of the refueling control processing.

In the embodiment, the single suction pump 13 is used for both the steam suction means and the exhaust means, but separate air pumps may be used.

Further, the gas sensor 12 has been described as being provided in the weighing machine 1, but the gas sensor 12 is not limited to this, and may be provided separately from the discharge pipe 8a of the refueling nozzle 8.
For example, it may be provided in the middle of the intake hose 11 along the hose 7.

Furthermore, although the suction hose 11 is exemplified as the steam suction conduit, a portion along the hose 7 may be a hose, and a portion in the weighing machine 1 may be a fixed pipe.

On the other hand, the vapor discharge port 11b of the intake hose 11 may be opened outside the main body casing of the weighing machine 1.

Furthermore, it goes without saying that the oil supply device of the present invention is not limited to a fixed type weighing machine, and may be applied to a suspension type weighing machine.

〔The invention's effect〕

The oil supply device according to the present invention is as described in detail above. The oil vapor detection means is provided in the middle of the steam suction pipe away from the discharge pipe portion of the oil supply nozzle, and the oil vapor sucked by the steam suction means is provided. When the concentration of oil is detected by the oil vapor detecting means, the signal difference is calculated by using the signal difference calculating means as a signal difference every minute time, and the signal difference sampled by the range determining means for each oil type falls within the range for each oil type. It is determined whether each signal difference is within a predetermined range by each of the determination means, and the number of times is counted. If the number of counts reaches a predetermined number continuously, the oil in the fuel tank is counted. Since the type is determined by the oil type determination means for each oil type, the time from the start of oil type detection to the determination can be reduced, and the oil type can be determined by the number of samplings. Independently and because those performed directly, can be carried out reliably identify the type of oil.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a fixed type weighing machine used in an embodiment of the present invention, FIG. 2 is a front view showing a specific configuration of a refueling amount indicator, and FIG. 3 is a detection interrupt of a detection signal from a gas sensor. FIG. 4 (a), FIG. 4 (b), FIG. 4 (c), and FIG. 4 (d) are flowcharts showing the refueling process. 1 ... Fixed weighing machine, 2 ... Piping, 3 ... Pump motor, 4 ... Pump, 5 ... Flow meter, 7 ... Hose, 8 ...
... refueling nozzle, 9 ... nozzle storage section, 10 ... nozzle switch, 11 ... intake hose, 11a ... steam suction port, 11b ...
Vapor discharge port, 12 Gas sensor, 13 Inlet pump, 14
...... Refueling amount display, 18 ... Mode display, 19 ... Control device.

Claims (1)

(57) [Claims] 1. A pipe having one end connected to a tank, a pump provided in the middle of the pipe and driven by a pump motor, a flow meter for measuring an oil supply amount, and a hose provided at the other end of the pipe. A refueling nozzle having a discharge pipe inserted into a fuel tank, and a steam suction pipe provided along the hose, one side of which is open to the tip of the discharge pipe of the refueling nozzle, and the other side of which is a steam discharge port. A steam suction means provided in the middle of the steam suction pipe or on the steam discharge outlet side for sucking steam in the fuel tank at the time of refueling, and the steam separated from the discharge pipe portion of the fueling nozzle. An oil vapor detecting means provided in the middle of the suction pipe and detecting the concentration of the oil vapor sucked by the vapor suction means; anda detection signal output from the oil vapor detecting means. A signal difference calculating means for calculating a difference between a previous captured value and a current captured value every minute time, and determining whether the calculated signal difference is within a predetermined range for each oil type. Means for judging whether or not each signal difference is within a predetermined range by each of the range judging means for each oil type, and counting the number of times, and the number of times of counting is continuously determined by the predetermined number of times. When the oil type is determined, the oil type determining means for each oil type for determining the oil type in the fuel tank, and whether or not the oil type determined by each of the oil type determining means matches the oil type supplied from the oil supply nozzle. An oil supply device comprising: an oil type collating unit that performs collation; and an oil supply control unit that controls oil refueling by the oil supply nozzle when the oil type collating unit determines that the oil types match.