JPH11201860A - Warning device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warning device by which the leak of a fuel from a fuel tank is detected properly so as to warn an operator by a method in which, on the basis of the decrease state of a residual quantity, inside the fuel tank, detected by a residual- quantity detection means, the external leak of the fuel is determined and a leak warning means is operated. SOLUTION: A controller 7, for a meter, which is built in a display panel inputs detection information from a fuel sensor S2 as a residual-quantity detection means for a fuel inside a fuel tank 16. In the fuel sensor S2, a float 17 is moved up and down due to a change in the height of a level inside the fuel tank 16, the angle of rotation of an arm 17a is detected by a potentiometer 18, and the residual quantity of the fuel inside the fuel tank 16 is detected on the basis of the up-and-down position of the float 17, i.e., on the basis of the height of the level. When the residual quantity of the fuel is decreased at a speed which is larger than a set decrease speed corresponding to the sending-out speed of the fuel to be sent out to an engine from the fuel tank 16 during the operation of the engine, a warning control means 100 determines that the fuel is leaked from the fuel tank 16. Then, the leak of the fuel is warned by the sound of a warning buzzer 8 by a leak warning means 101, and it is displayed on a liquid crystal display part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for a work vehicle for warning fuel leakage from a fuel tank provided in the work vehicle.

[0002]

2. Description of the Related Art In a working vehicle such as a combine or a tractor, fuel such as light oil for an engine is stored in a fuel tank. For example, fuel is discharged from fine holes generated by corrosion or damage of the fuel tank. When the fuel leaks, the operator usually notices the fuel leak visually and takes measures such as leak prevention.

[0003]

However, in the above-mentioned prior art, there is a risk that the worker may continue to operate the work vehicle without noticing the fuel leak from the tank. In such a case, the worker leaks fuel. Need to be informed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately detect that fuel has leaked from a fuel tank to the outside in order to solve the above-mentioned drawbacks of the prior art. The purpose is to inform workers of a fuel leak.

[0005]

According to the first aspect of the present invention, the amount of fuel remaining in the fuel tank is detected, and it is determined that the fuel in the fuel tank is leaking to the outside based on the state of decrease in the amount of fuel remaining. As a result, the leak alarm means for alarming the fuel leak from the fuel tank is operated.

Therefore, the information of the remaining amount detecting means provided for displaying the remaining amount of fuel in the fuel tank and the like is used to
Since it determines the leakage of fuel from the fuel tank, for example,
Detecting fuel leaking from the tank in the pan installed below the fuel tank to determine fuel leakage from the fuel tank requires a special device to detect leaks, It is possible to properly detect fuel leaks while avoiding the complexity of the equipment configuration and notify the workers of the fuel leaks. The inconvenience of driving the vehicle can be appropriately avoided.

According to a second aspect of the present invention, in the first aspect, when the engine provided in the work vehicle is operating, the detected remaining amount of fuel in the fuel tank is determined by the delivery speed of the fuel delivered from the fuel tank to the engine. When decreasing at a speed greater than the corresponding set reduction speed, a leak of fuel from the fuel tank is determined.

Therefore, during the operation of the engine, it is possible to determine the fuel leakage from the tank based on the decreasing rate of the remaining fuel amount in the tank which is sent from the fuel tank to the engine and decreases. The fuel leakage from the fuel tank can be properly determined not only when the engine is stopped but also when the engine is operating, in which the fuel leakage can be determined if the amount is reduced a little. can get.

According to a third aspect, in the first or second aspect,
When the fuel in the fuel tank is discharged to the outside and the discharge operation information is input by the manual information input means, the leak alarm means is not operated.

Therefore, if the discharge operation information is input by the information input means such as a manual switch, the leak alarm is not activated, so that when the fuel in the fuel tank is extracted to the outside, the discharge operation information is manually switched. Etc. to stop unnecessary leak alarms.
Advantageous measures of claim 1 or 2 are obtained.

[0011]

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. And, when the engine E operates,
The fuel in the fuel tank 16 is configured to be delivered to the engine E by a fuel delivery pump or the like (not shown). It should be noted that the cutting unit 12 has a stock sensor S that is turned on when the culm touches to detect that a cutting operation is being performed.
1 is provided.

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, and 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 includes 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, 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 amount of fuel in the fuel tank 16 on the liquid crystal display 1 based on the information of the fuel sensor S2. Specifically, as shown in FIG. 4, at the left end of the screen of the liquid crystal display unit 1, a plurality of display segments seg (in the figure, four) which can be switched between a light-on state and a light-off state are arranged horizontally. Juxtaposed. Then, the left end side of the horizontal line-shaped segment seg corresponds to the fuel remaining amount decreasing side, and the right end side corresponds to the fuel remaining amount full side, and as the fuel remaining amount increases, the segment which lights from the left end side to the right end side increases. The number increases.

A leak alarm means 101 for alarming a fuel leak from the fuel tank 16 is provided.
Numeral 01 warns of a fuel leak by sound and displays information indicating the leak on the liquid crystal display unit 1. Specifically, the alarm buzzer 8 is operated intermittently, and FIG.
As shown in (b), a message of "fuel leak" is displayed on the screen of the liquid crystal display unit 1.

Using the meter controller 7,
When it is determined that the fuel in the fuel tank 16 is leaking to the outside based on the state of decrease in the fuel remaining amount in the fuel tank 16 detected by the fuel sensor S2, the leak alarm means 101 is activated. The alarm control means 100 to be operated is constituted.

The alarm control means 100 determines that the fuel remaining in the fuel tank 16 detected by the fuel sensor S2 indicates that the fuel tank 1 is in operation while the engine E is operating.
It is configured to determine the leakage of the fuel from the fuel tank 16 when the speed decreases from a set speed corresponding to the speed at which the fuel is sent from the engine 6 to the engine E. Here, the fuel delivery speed from the fuel tank 16 to the engine E is determined by the drive speed of the fuel delivery pump and the like, and is stored in the meter controller 7 in accordance with the drive speed of the pump and the like. The value of the set decreasing speed and the information such as the actual rotation speed of the pump are taken into the meter controller 7, and both are compared.
It is determined whether or not the fuel delivery speed is higher than the corresponding set reduction speed. During the stop of the engine E, if it is detected that the fuel in the fuel tank 16 is slightly reduced, it is determined that the fuel is leaking.

However, as shown in FIG.
A removal switch SW is provided as manual information input means for inputting the discharge operation information to the meter controller 7 when the fuel inside the fuel discharger 6 is discharged to the outside.
The alarm control unit 100 is configured not to operate the leak alarm unit 101 when the discharge operation information is input by the extraction switch SW.

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, it is determined by the rotation speed sensor S3 whether the engine E is operating (whether the rotation speed is 500 rpm or more). When the engine E is stopped, the presence or absence of fuel leakage from the fuel tank 16 is further determined. When no fuel is leaking, an "hour meter" shown in FIG. On the other hand, when fuel leakage is determined,
As shown in (b), a "fuel leak" message is displayed on the display screen of the liquid crystal display unit 1 and the alarm buzzer 8 is displayed.
Is operated intermittently.

As shown in FIG. 6, in the process of detecting and displaying the remaining fuel amount executed in another control routine, the fuel sensor S
2 are sampled at a set time interval (for example, 80 ms), the set number (for example, 4) of the sampled data is subjected to simple averaging processing to obtain a fuel remaining value, and the fuel corresponding to the fuel remaining value is obtained. Turn on the number display segment. The detection value of the fuel sensor S2 represents the range of the output voltage of the sensor from 0 to 5 V by 8-bit data (256 levels).

The determination of the fuel leakage is made based on the decreasing state of a plurality of continuous fuel remaining values (for example, 11) obtained in the remaining amount detecting process. That is, the reduction rate obtained by dividing the difference between the first fuel remaining value and the last fuel remaining value by the time (3200 ms) is:
The presence or absence of fuel leakage is determined based on whether or not the speed is higher than the above-described set reduction speed.

On the other hand, when the engine E is operating,
Further, when the presence or absence of fuel leakage from the fuel tank 16 is determined and the fuel leakage is determined, a message of “fuel leakage” is displayed on the display screen of the liquid crystal display unit 1 as shown in FIG. At the same time, the alarm buzzer 8 is operated intermittently. On the other hand, when the fuel is not leaking, it is further determined whether or not the working conditions of the mowing work are satisfied. Until the working conditions are satisfied, the right side of the screen is shifted as shown in FIG. A bar graph type engine rotation display in which the bar 1a expands and contracts is performed (in the figure, 1b is a mark indicating the position of the rated rotation speed of the engine E, and the value of the rated rotation speed is stored in the meter controller 7). )), When the working condition is satisfied, the engine load is displayed as a number from 1 to 4 indicating the magnitude of the load, as shown in FIG. here,
Regarding the working conditions, the stock sensor S1 and the threshing switch S
4 is in the ON state, the neutral switch S6 and the reverse switch S7 are in the OFF state, and the vehicle speed detection value is 0.05 m /
When the time is equal to or longer than the second, it is determined that the work condition is satisfied. In addition, the engine load is determined by 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 revolutions.
It is determined that the larger 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 leak alarm means 101 may be, for example, a flashing alarm lamp or the like, in addition to the alarm sound such as a buzzer. Further, in addition to displaying a “fuel leak” message on the display screen of the liquid crystal display unit 1 as leak information, for example, a segment image of a remaining amount display may be blinked.

The determination of fuel leakage, which is performed by the alarm control means 100 based on the state of decrease in the amount of fuel remaining in the fuel tank 16, is not limited to that shown in the above-described embodiment, but may be of various constructions. .

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.

[Explanation of symbols]

 Reference Signs List 16 fuel tank 100 alarm control means 101 leak alarm means E engine S2 remaining amount detection means SW information input means

────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. ⁶ identifications FI F02M 37/00 301 G01F 23/00 Z G01F 23/00 G08B 21/00 U G08B 21/00 B60K 15/02 E (72) invention Kazuya Takasaki 64, Ishizukita-cho, Sakai-shi, Osaka, Japan (72) Inventor Chuki 64, Ishizukita-cho, Sakai-shi, Osaka, Japan Kubota-Sakai Factory, Inc.

Claims (3)

[Claims] 1. A fuel level detecting means for detecting a fuel remaining amount in a fuel tank provided in a work vehicle; a leak warning means for warning a fuel leak from the fuel tank; Alarm control means for activating the leak alarm means when it is determined that the fuel in the fuel tank is leaking to the outside based on the reduced state of the remaining fuel amount in the fuel tank. Work vehicle alarm device. 2. The fuel control device according to claim 2, wherein the fuel in the fuel tank is sent to an engine provided in a work vehicle, and the alarm control unit detects the fuel in the fuel tank detected by the remaining amount detection unit. When the remaining amount decreases at a speed greater than a set reduction speed corresponding to a delivery speed of the fuel delivered from the fuel tank to the engine during the operation of the engine, the leakage of the fuel from the fuel tank is reduced. The alarm device for a work vehicle according to claim 1, wherein the alarm device is configured to determine. 3. When the fuel in the fuel tank is discharged to the outside, manual information input means for inputting discharge operation information is provided, and the alarm control means is provided by the information input means. The alarm device for a work vehicle according to claim 1 or 2, wherein the leak alarm unit is not activated when discharge operation information is input.