JPH11160127A - Fueling discriminating device and alarm device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately discriminate whether or not fuel is being supplied to a fuel tank and properly avoid such trouble that fuel is overflow due to excessive filling of fuel into the fuel tank during the fueling. SOLUTION: The amount of fuel remaining in a fuel tank 16 mounted on a working vehicle is detected by a remaining amount detection means S2 and, based on the increasing condition of the remaining amount of detected fuel, it is discriminated by a discriminating means 103 whether or not fuel is being supplied to the fuel tank 16. When it is discriminated that the fuel tank 16 is filled up fully with fuel when fuel is discriminated to be under feeding, a full amount alarming means 101 alarms that the fuel tank 16 is filled up fully with fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle refueling judging device for refueling a fuel tank provided in a work vehicle, and a work vehicle alarm device provided with the refueling judging device.

[0002]

2. Description of the Related Art In a work vehicle such as a combine or a tractor, when replenishing fuel such as light oil into a fuel tank, the remaining amount of fuel in the fuel tank is usually detected by detecting means such as a float type sensor. The state of the detected remaining fuel amount is displayed on a pointer-type or liquid crystal display type fuel gauge, and conventionally, a worker performing refueling work refuels the tank while watching the remaining amount display. Was like that.

[0003]

However, in the above-mentioned prior art, even when the fuel supply to the fuel tank is started, the state of remaining fuel displayed on the fuel gauge or the like does not suddenly change greatly. Since it is not determined on the working vehicle side whether or not the fuel tank is being refueled, for example, the display state of the remaining amount display by the fuel gauge or the like is changed based on the determination during the refueling (for example, However, it was not possible to take measures such as increasing the display resolution or displaying the indication during refueling) or allowing the worker to perform the refueling work properly. Here, as means for determining whether or not fuel is being supplied to the fuel tank, a configuration may be considered in which it is detected that the lid of the fuel filler of the tank has been opened and fuel is being supplied. However, in this case, when the operator opens the lid for a purpose other than refueling, there is a disadvantage that it is erroneously determined that the fuel is being refueled, and a means such as a detection switch for detecting the opening and closing of the lid is required. This disadvantageously complicates the device configuration.

[0004] The present invention has been made in view of the above circumstances, and uses the detection information of the remaining amount detecting means originally provided for detecting the remaining amount of fuel in the fuel tank. A first object is to appropriately determine whether or not fuel is being supplied to the fuel tank while avoiding complication. Further, when determining whether or not the fuel is being replenished using the detection information of the remaining amount detecting means, when the liquid level in the tank fluctuates due to the influence of the inclination or vibration of the vehicle body, the fuel refueling is erroneously performed. The second is to avoid discriminating that
The purpose of. It is a third object of the present invention to notify a worker of refueling when the refueling is being performed, so that the worker can appropriately perform refueling work.

Further, in the above-mentioned prior art, when a large amount of fuel is to be put into the fuel tank, an operator looks at the inside of the tank from the fuel filler, but the inside of the tank is dark and difficult to see. It is not easy to determine whether or not the fuel tank is full, and despite the tank being full, there is a problem that the fuel continues to overflow from the tank without reminding of it. There was a fear. In view of the above, a fourth object of the present invention is to make it possible to appropriately avoid problems such as overflowing of fuel due to excessively filling the fuel tank during the refueling.

[0006]

According to the present invention, the remaining amount of fuel in the fuel tank provided in the work vehicle is detected by the remaining amount detecting means, and based on the detected increasing state of the remaining fuel amount. It is determined whether or not fuel is being supplied to the fuel tank.

[0007] Therefore, for example, a system for detecting whether or not the fuel tank is being refueled by detecting the opening / closing of a lid provided at a fuel supply port of the fuel tank includes a method in which an operator uses the lid for a purpose other than refueling. In addition, there is a disadvantage that it is erroneously determined that the fuel is being replenished when the fuel cell is opened, and a device such as a detection switch for detecting the opening and closing of the lid is required, thereby complicating the device configuration. , Using the detection information of the originally provided remaining amount detection means, while avoiding the complexity of the device configuration,
It is possible to appropriately determine whether or not fuel is being supplied to the fuel tank, and the first object described above is achieved.

According to a second aspect, in the first aspect, an increased state in which a detection value obtained by sampling a detection value of the remaining fuel amount detected by the remaining amount detection means at a set time interval is larger than a previous value, After the first set number of times, the detected value sampled at the set time interval is increased from the previous value, or the quantitative state where neither increase nor decrease is performed, the second set number of times When the continuation is counted, it is determined that the fuel tank is being refueled.

Therefore, the state in which the detected value of the remaining fuel amount increases continuously determines that fuel is being supplied to the fuel tank in a preliminary manner. This state, in other words, the state where it does not decrease continues, it is determined that fuel is being replenished, so it is determined, for example, that the liquid level in the tank fluctuates due to the inclination or vibration of the vehicle body, etc. Thus, when the detected value of the remaining fuel amount temporarily increases, it is possible to appropriately avoid erroneously determining that the fuel is being replenished, and thus the preferable means of claim 1 is obtained.
The above-mentioned second object is achieved. Further, for example, when refueling in a state where the fuel remaining amount in the tank is almost full,
By setting the first set number to a small number (for example, the minimum value of 2), after the preliminary determination during the refueling is reliably performed, it is determined that the worker is almost full and the refueling amount is determined. It is also possible to appropriately determine that the fuel is being supplied even when the fuel supply is reduced or the supply is stopped.

According to a third aspect of the present invention, in the second aspect, when the sampled detected value changes from the previous value to the increasing side by more than the increasing side set value larger than the decreasing side set value, It is determined that the detection value is in the increasing state,
The sampled detection value is decreasing from the previous value,
When the detected value changes by at least the decreasing side set value smaller than the increasing side set value, it is determined that the detected value is in the decreasing state.

Therefore, the condition for judging the state of increase when the detected value of the remaining fuel amount changes to the increasing side is smaller than the condition for judging the state of decreasing when the detected value of the remaining fuel changes to the decreasing side. Strictly set, it is possible to more appropriately avoid erroneously determining that refueling is being performed, and the preferable means of claim 2 is obtained, and the above-mentioned second object is achieved. Is done.

According to a fourth aspect, in the second or third aspect,
After counting that the sampled detection value has increased from the previous value continuously for the first set number of times, counting that the state of either the increase state or the fixed amount state has continued for the second set number of times is counted. By the time, if the sampled detected value decreases from the previous value, the process is restarted from the counting process of determining whether the sampled detected value continuously increases from the previous value for the first set number of times. .

Therefore, while the state in which the detected value of the remaining fuel amount continuously increases, it is preliminarily determined that the fuel is being supplied to the fuel tank. If the reduction state occurs even once by this time, the processing is restarted from the beginning, so that it is possible to more accurately avoid erroneously determining that the fuel is being replenished. Is obtained, and the second means described above is obtained.
Is achieved.

According to a fifth aspect, any one of the first to fourth aspects is provided.
In the item, when it is determined that the fuel is being supplied, it is displayed that the fuel is being supplied to the fuel tank.

Therefore, when the worker starts refueling the fuel tank, the state of the remaining amount display on the liquid crystal display or the like does not immediately change greatly. Although it is difficult to determine that refueling is being performed, it is possible to accurately determine that fuel is being supplied to the tank by the above-described refueling indication, and to continue fueling work appropriately. , Claims 1 to
The preferred means of any one of (4) is obtained, and the third object is achieved.

According to claim 6, any one of claims 1 to 5 is provided.
Item is provided with a refueling determination device for the work vehicle according to the item, in a state where it is determined that refueling the fuel tank,
When it is determined that the fuel in the fuel tank is full, it is warned that the fuel in the fuel tank is full.

Therefore, in the state where the refueling of the fuel tank is being determined, the full state is determined and the worker is alerted of the full state. In the case of performing the full-capacity warning by performing only the determination of the state, compared to performing the full-capacity warning when the full-capacity is erroneously determined, the possibility that the full-capacity warning is erroneously performed is more appropriately avoided. In addition, the worker can continue replenishing without noticing that the worker is full, and can appropriately avoid problems such as fuel overflowing from the tank, thereby achieving the fourth object described above. You.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a combine as a working vehicle will be described below with reference to the drawings. As shown in FIG. 1, the combine is provided with a reaper 12 at a front portion of a vehicle body V provided with a pair of right and left crawler traveling devices 11, and a control unit 1 behind the reaper.
3, a threshing unit 14 for threshing the grain stalks cut by the cutting unit 12, a Glen tank 15 for storing grains supplied from the threshing unit 14, and the like. An engine E is provided below the driver's seat of the control unit 13, and a fuel tank 16 for the engine E is provided below the floor of the control unit 13 so that fuel such as light oil is supplied from a fuel supply port 16 a. Has become. The cutting unit 12 is provided with a stock sensor S1 that is turned on when the grain stem touches to detect that the cutting operation is being performed.

As shown in FIG. 2, a display panel C for displaying various kinds of operation information to be notified to an operator is installed on the front side of the control unit 13, and its display surface is a dot matrix type. It comprises a liquid crystal display section 1 configured as a graphic display, a charging lamp 2, a preheating lamp 3, an oil lamp 4, a caution lamp 5, a left and right turn signal lamp 6, and the like. The liquid crystal display unit 1 displays operating information such as an hour meter (operating time), an engine speed, and an engine load (see FIG. 4). The oil lamp 4 is turned on when the oil switch is turned on, the charging lamp 2 is turned on when the charging switch is turned on, and the left and right turn signal lamps 6 are turned on when the left and right turn signal lamp switches are turned on.

Although not shown, the control unit 13 includes a vehicle body V
Lever that operates a steering lever that controls steering of the engine, a threshing lever that operates a threshing clutch that switches on and off power transmission from the engine E to the threshing unit 14, and a mower that operates a cutting clutch that switches on and off power transmission from the engine E to the cutting unit 12 A lever and the like are provided. The control section 13 is provided with an accelerator lever for changing and adjusting the number of revolutions of the engine E. Normally, after adjusting the accelerator lever to the start position, the key switch MW described later is switched to the engine start position. After starting the engine E, the operator operates the accelerator lever to increase the output to the rated working speed (for example, 2900 rpm) while watching the display of the engine speed displayed on the liquid crystal display unit 1. .

The display panel C has a built-in meter controller 7 constructed by using a microcomputer. As shown in FIG.
The stock sensor S1, a threshing switch S4 for detecting the on / off state of the threshing clutch, and a fuel tank 16
Each detection information of a float type fuel sensor S2 as a remaining amount detecting means for detecting the remaining amount of fuel in the inside and a rotation speed sensor S3 for detecting the output rotation speed of the engine E are inputted. Here, when the engine E rotates, for example,
If it exceeds 00 rpm, it is determined that the engine E is operating. On the other hand, a drive signal for the liquid crystal display unit 1 and the alarm buzzer 8 is output from the meter controller 7.

The control unit 13 has an off state in which power supply from a driving power source constituted by a battery (not shown) to each part of the vehicle body is turned off, an on state in which power supply to each part of the vehicle body is turned on, and A key switch MW that can be switched between an engine start state and a start state is provided, and the switch information is input to the meter controller 7. Further, a transmission section for the crawler traveling device 11 is provided with a vehicle speed sensor S5 for detecting a vehicle speed, a neutral switch S6 for detecting a traveling neutral state, and a reverse switch S7 for detecting a reverse traveling state. It is input to the meter controller 7.

The fuel sensor S2 has a float 17 that moves up and down due to a change in the liquid level in the tank 16, and holds the float 17 at the distal end while rotating the base end around the horizontal axis by the tank upper wall. Arm 17 freely pivoted
a (however, the upper rotation range is limited by the position at which it hits the stopper 19), and a potentiometer 18 for detecting the rotation angle of the arm 17a, and the vertical position of the float 17, which is detection information of the potentiometer 18. That is, the fuel level in the tank is detected based on the liquid level.

The meter controller 7 is configured to display the remaining fuel amount in the fuel tank 16 detected by the fuel sensor S2 on the liquid crystal display unit 1.
Specifically, as shown in FIG. 4, a plurality of display segments seg, which can be switched between a light-on state and a light-off state, are juxtaposed in a horizontal line at the left end of the screen of the liquid crystal display unit 1. The left end of the segment seg is shaped like the fuel remaining,
The right end side corresponds to the full fuel remaining amount side, respectively, and the greater the remaining fuel amount, the greater the number of segments that are lit from the left end side to the right end side. Here, the number of the segment seg is usually four, but when it is determined that fuel is being replenished (during refueling) as described later, as shown in FIGS. It is increased to eight in a state of expanding to.

A full warning means 101 is provided for warning that the fuel in the fuel tank 16 is full. The full warning means 101 gives an alarm by sound when the fuel tank 16 is full. The display of the remaining fuel amount on the liquid crystal display unit 1 is configured to display full amount information indicating a full state. Specifically, the alarm buzzer 8 is intermittently operated, for example, five times, and a message of “fuel full” is displayed on the screen of the liquid crystal display unit 1 as full information as shown in FIG.

Using the meter controller 7,
A determination means 103 is provided for determining whether or not fuel is being supplied to the fuel tank 16 (during refueling) based on the state of increase in the remaining amount of fuel detected by the fuel sensor S2. Specifically, the determination unit 103 samples the detected value of the remaining fuel amount detected by the fuel sensor S2 at a set time interval, and increases the sampled detection value from the previous value. However, after the first set number of times (for example, three times), a state in which either the increased state in which the sampled detection value increases from the previous value, or the quantitative state in which neither the increase nor the decrease occurs, is followed by the second state. 2
When counting the number of consecutive times (for example, 13 times),
It is determined that fuel is being supplied to the fuel tank 16. In this embodiment, as described later, the fuel sensor S
The output value of No. 2 is sampled at intervals of 20 ms, and four data are simply averaged to obtain the remaining amount detection value. Therefore, the sampling interval of the detection value of the remaining fuel amount in the determination during replenishment is 20 ms × 4 = 80 ms. .

The determining means 103 determines that the detected value is in the increasing state when the sampled detected value changes from the previous value to the increasing side by a set value on the increasing side. When the detected value changes from the previous value to the decreasing side by more than the decreasing side set value, it is determined that the detected value is in the decreasing state, and the increasing side setting value is larger than the decreasing side setting value. You have set. That is, the output voltage range of the fuel sensor S2 (for example, 0 to 5)
V) is divided into 256 levels (the number of levels in 8-bit data), and when each remaining amount detection value rises by 8 levels (increase side set value) or more with respect to the previous value, it is determined that the state is an increase state. If the level drops by more than 3 levels (decreasing side set value), it is determined to be in a decreasing state.
It is determined that the quantitative state does not increase or decrease.

However, the discriminating means 103 counts whether the sampled detection value has continuously increased from the previous value by the first set number of times (for example, three times), and then determines whether the state is the increased state or the fixed state. If the sampled detection value decreases from the previous value before counting that the state of any of the above has been continued for the second set number of times (for example, 13 times), the sampled detection value becomes the first value. The system is configured so that the process is repeated from the counting process of determining whether or not the value is increased from the previous value continuously for a set number of times (for example, three times).

When the determination means 103 determines that the fuel is being supplied, the display means 10 displays that the fuel is being supplied to the fuel tank 16.
2 is provided using the liquid crystal display unit 1. Specifically, as shown in FIG. 4 (b), a message “refueling” is displayed on the screen of the liquid crystal display unit 1.

Further, in the state where the determination means 103 determines that the fuel is being supplied to the fuel tank 16 using the meter controller 7, the fuel tank 1
Alarm control means 10 for activating the full quantity alarm means 101 in accordance with the determination that the fuel in the fuel tank 6 is full.
0 is configured. Specifically, when the time when the detection value of the fuel sensor S2 reaches the maximum detection value continues for a set time (for example, 2 seconds) or more, it is determined that the fuel in the fuel tank 16 is full. I do. Here, the maximum detection value is determined when the arm 17a of the fuel sensor S2 is
This is a detection value that is saturated in a state where the upward rotation is limited at 9 and is set to an amount smaller than the fuel capacity of the fuel tank 16.

The control operation of the meter controller 7 will be described below with reference to the flowcharts of FIGS. In the display and alarm control (FIG. 5), first, when the switching state of the key switch MW is detected, the refueling mode is turned off (released) when the key switch MW is off and the engine is started, and the liquid crystal screen is displayed. The message of "FULL FULL" is erased and the full alarm is stopped. When the key switch MW is on, it is determined whether or not the engine E is stopped by the rotation speed sensor S3 (whether or not the rotation speed is less than 500 rpm), and when the engine E is stopped. Determines whether the set time (20 seconds) has elapsed after the engine has stopped, and only when the set time (20 seconds) has elapsed after the engine has stopped,
Perform the following processing. That is, when the refueling mode is off, it is determined whether or not refueling is in progress. When the refueling is not in progress, an "hour meter" shown in FIG. 4A is displayed. After turning on the mode, Figure 4 (b)
Display during refueling as shown in Fig. In the "refueling display", the number of segments for displaying the remaining fuel amount, which is displayed as a bar graph on the left end of the screen, is increased from the normal four to eight and enlarged, and the "refueling" display is displayed on the screen. Display the message of On the other hand, in the case of the refueling mode, the release condition of the refueling mode is determined, and if the release condition is determined, the refueling mode is turned off. Then, in the refueling mode, it is determined whether or not the fuel tank 16 is full. When the fuel tank 16 is full, a message of “fuel full” shown in FIG. A full alarm operation for intermittently operating the alarm buzzer 8 is executed.

The engine E is detected by the rotation speed sensor S3.
If it is detected that has changed from the operating state to the stopped state, after the engine is stopped, the set time (about 20 seconds)
Only after the elapse of the time, it is determined whether or not the fuel is being replenished, or the full-capacity alarm operation is performed. After a while after the stoppage, the above-described processes are appropriately performed after the liquid level of the fuel in the tank 16 is stabilized.

As shown in FIG. 6, the remaining fuel detection / display processing is executed by another control routine. In the remaining fuel detection / display processing, the detected value of the fuel sensor S2 is set at a set time interval (engine time). 80 ms when operating, 2 when engine stopped
0 ms), and the set number of sampling data (8 when the engine is running, 4 when the engine is stopped)
The remaining fuel value is obtained by simple averaging of the fuel cells, and the number of display segments corresponding to the fuel remaining value is turned on.

In the refueling determination processing for determining whether or not the fuel is being supplied, as shown in FIG. 7, the state in which the remaining fuel value obtained in the remaining fuel detection processing increases from the previous value is m. After the first counter has counted up consecutively (for example, three times), one of the quantitative states in which the remaining fuel amount does not increase or does not increase or decrease continues for n times (for example, three times). When the second counter counts up continuously (13 times), it is determined that refueling is in progress. However, if the remaining fuel value decreases at least once from the previous value in the n counting processes, the first and second counter values are reset so that the remaining fuel value increases from the previous value. The process is repeated from the counting process of determining whether or not the state to be performed is repeated m times (for example, three times). In other words, it is possible to avoid erroneous determination of refueling due to fluctuations in the liquid level.

Similarly, in the refueling mode release determination processing for determining the release of the refueling mode, as shown in FIG. 8, the state in which the fuel remaining amount decreases from the previous value is m ′ times (for example, 3 times).
After the third counter counts up continuously, any one of the quantitative states in which the remaining fuel amount decreases or does not increase or decrease continues n ′ times (for example, 13 times). When the fourth counter counts up continuously, it is determined that the condition for canceling the refueling mode is satisfied. However, if the remaining fuel value increases at least once from the previous value in the n ′ number of counting processes, the third and fourth counter values are reset so that the remaining fuel value becomes smaller than the previous value. The process is repeated from the counting process for determining whether the decreasing state continues m ′ times (for example, three times). In other words, due to fluctuations in the liquid level,
It is prevented that the refueling mode is canceled by mistake.

In the full capacity determination processing for determining whether or not the fuel is in the full state, as shown in FIG. 9, whether the detected value of the fuel sensor S2 has reached the maximum detection value, It is determined whether or not each of the remaining fuel values (the average value of the four data sampled at intervals of 20 ms) obtained as described above has reached the maximum detection value, and if the remaining fuel value has reached the maximum detection value, The full count value is incremented by one, and if not reached, the full count value is cleared, and the full count value becomes equal to or greater than the set value (25) and continues for a predetermined time (2 seconds). When the detected value has been reached, the full state is determined.

On the other hand, when the key switch MW is on and the engine E is operating, the refueling mode is turned off, and the full fuel alarm operation is stopped (the message "FULL FULL" on the liquid crystal screen is erased). After that, it is determined whether or not the work condition of the harvesting work is satisfied. Until the work condition is satisfied, as shown in FIG. The engine speed is displayed (in the figure, 1b is a mark indicating the position of the rated speed of the engine E, and the value of the rated speed is stored in the meter controller 7). As shown in FIG. 4 (e), an engine load representing the magnitude of the load is displayed by numbers from 1 to 4. Here, the working conditions are as follows when the stock sensor S1 and the threshing switch S4 are on, the neutral switch S6 and the reverse switch S7 are off, and the vehicle speed detection value is 0.05 m / sec or more. It is determined that the working condition is satisfied. or,
The engine load is determined based on the amount of decrease in the number of revolutions from the initial number of revolutions in a no-load state after being adjusted to the rated number of revolutions, such that the greater the amount of decrease, the greater the load.

[Another Embodiment] The remaining amount detecting means S2 may be, for example, an ultrasonic type or a photoelectric type sensor other than the float type sensor.

The determination means 103 determines whether the fuel tank 1 is in accordance with the state of increase of the remaining fuel amount detected by the remaining amount detection means S2.
The specific configuration for determining whether or not refueling of the fuel cell 6 is in progress is not limited to the configuration of the above embodiment. For example, the conditions such as the sampling interval (80 ms) of the detection value of the remaining fuel amount in the refueling determination process, the first and second set times, and the increase and decrease set values can be changed as appropriate.

The display means 102 is not limited to displaying the message "refueling" on the screen of the liquid crystal display section 1. For example, the refueling display lamp provided separately may be turned on to indicate that the fuel is being supplied. May be displayed.

In the above embodiment, the determination by the determination means 103 as to whether fuel is being supplied or not, the fullness determination by the alarm control means 100, and the alarm operation based thereon are executed only when the engine E is operating. Although not executed when the engine E is stopped, the determination means 103 and the alarm control means 100 may be operated, for example, when the engine E is idling while the vehicle is stopped.

In the above embodiment, the alarm control means 100
The full state of the fuel in the fuel tank 16 is determined when the time during which the remaining amount detecting means S2 reaches the maximum detection value continues for the set time (2 seconds). However, the present invention is not limited to this. A configuration in which a plurality of sensing sensors that are turned on when fuel comes into contact at the upper position in the tank 16 is provided, and when the plurality of sensing sensors are simultaneously turned on, it is determined that the fuel tank is full. Good.

The full-capacity warning means 101 may be, for example, an alarm lamp which blinks, for example, in addition to a warning sound of a buzzer or the like.
In addition to displaying the message of "fuel full" on the display screen as the full amount information, for example, a segment image of the remaining amount display may be blinked.

The work vehicle is not limited to the combine for harvesting work, but may be other agricultural work vehicles or various work vehicles for civil engineering and construction.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a plan view showing a display panel.

FIG. 3 is a block diagram showing a control configuration.

FIG. 4 is a diagram of a display screen showing display contents of operation information.

FIG. 5 is a flowchart of a control operation.

FIG. 6 is a flowchart of a control operation.

FIG. 7 is a flowchart of a control operation.

FIG. 8 is a flowchart of a control operation.

FIG. 9 is a flowchart of a control operation.

[Explanation of symbols]

 Reference Signs List 16 fuel tank 100 alarm control means 101 full alarm means 102 display means 103 determination means S2 remaining amount detection means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhiro Takahara 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (6)

[Claims] 1. A fuel level detecting means for detecting a fuel level remaining in a fuel tank provided in a work vehicle; and a fuel tank based on an increasing state of the fuel level detected by the fuel level detecting means. And a determining means for determining whether or not refueling is being performed. 2. The fuel cell system according to claim 1, wherein the determination unit samples a detection value of the remaining fuel amount detected by the remaining amount detection unit at a set time interval, and the sampled detection value increases from a previous value. However, after the first set number of consecutive times, subsequently, either the increased state in which the sampled detection value increases from the previous value or the quantitative state in which neither the increase nor the decrease is continued for the second set number of times 2. The refueling determining device for a working vehicle according to claim 1, wherein when counting the number of times, it is determined that refueling of the fuel tank is being performed. 3. When the sampled detection value changes from a previous value to an increase side by an increase-side set value or more, the determination means determines that the detection value is in an increase state, and determines the sampled detection value. When the value changes from the previous value to the decreasing side by more than the decreasing side set value, it is determined that the detected value is in the decreasing state, and the increasing side setting value is set to be larger than the decreasing side setting value. The refueling determination device for a working vehicle according to claim 2. 4. The method according to claim 1, wherein the determining unit counts that the sampled detection value has increased continuously from the previous value for the first set number of times, and then determines whether the state is either the increased state or the fixed state. If the sampled detection value decreases from the previous value by the time the second predetermined number of times is counted, the sampled detection value increases from the previous value continuously for the first predetermined number of times. 3. The apparatus according to claim 2, wherein the processing is restarted from the counting processing of whether or not the processing is performed.
Or the refueling determination device for a work vehicle according to 3. 5. A display means for displaying that fuel is being supplied to the fuel tank when the fuel supply is being performed by the determination means. 5. The refueling determination device for a working vehicle according to any one of 4. 6. An alarm device for a work vehicle provided with the work vehicle refueling determination device according to claim 1, wherein the fuel in the fuel tank is in a full state. A full-capacity alarming means for giving an alarm; and a state in which the determination means determines that the fuel is being replenished. An alarm device for a work vehicle provided with alarm control means for operating alarm means.