Work vehicle and method for detecting fluid replenishment in a work vehicle

Abstract

To provide a work vehicle which causes supply of a liquid such as a fuel and urea water while liquid supply to be notified of.SOLUTION: A work vehicle includes a tank, a liquid amount detection sensor, a speaker, and an electronic circuit. The tank is configured to store a liquid. The liquid amount detection sensor is configured to be provided in the tank, and measure an amount of the liquid in the tank. The speaker is configured to output a notification sound. When the amount of the liquid per unit time detected by the liquid amount detection sensor increases, the electronic circuit is configured to allow the speaker to output the notification sound, and when the amount of the liquid per unit time detected by the liquid amount detection sensor does not increase, the electronic circuit is configured to allow the speaker to stop the output of the notification sound.SELECTED DRAWING: Figure 8

Description

[Technical Field] 【0001】 The present invention relates to a work vehicle and a method for detecting the replenishment of liquid in a work vehicle. [Background technology] 【0002】 Patent Document 1 describes a work vehicle that communicates the remaining amount of fuel or urea solution to the user by sounding a buzzer and / or illuminating a predetermined button. [Prior art documents] [Patent Documents] 【0003】 [Patent Document 1] U.S. Patent No. 9815332 [Overview of the Initiative] [Problems that the invention aims to solve] 【0004】 In conventional technology, it is necessary to press the respective switch corresponding to fuel or urea solution in order to sound the buzzer, and if the wrong switch is pressed, the buzzer will not sound or the button will not flash while refueling or urea solution is being added. [Means for solving the problem] 【0005】 A work vehicle according to a first aspect of this disclosure comprises a tank, a liquid level detection sensor, a speaker, and an electronic circuit. The tank is configured to store liquid. The liquid level detection sensor is installed inside the tank and is configured to measure the amount of liquid in the tank. The speaker is configured to output an alarm sound. The electronic circuit is configured to cause the speaker to output an alarm sound when the amount of liquid per unit time detected by the liquid level detection sensor is increasing, and to stop outputting the alarm sound when the amount of liquid per unit time detected by the liquid level detection sensor is not increasing. 【0006】 A work vehicle according to a second aspect of this disclosure comprises a tank, an additional tank, a liquid level detection sensor, an additional liquid level detection sensor, a speaker, and an electronic circuit. The tank is configured to store liquid. The additional tank is configured to store an additional liquid different from the liquid. The liquid level detection sensor is configured to measure the amount of liquid in the tank. The speaker is configured to output an alarm sound and an additional alarm sound in which one of the characteristics of the audible frequency spectrum and the intermittently emitted sound output interval differs from that of the alarm sound. The electronic circuit is configured to cause the speaker to output an alarm sound according to the amount of liquid, and to cause the speaker to output an additional alarm sound according to the amount of additional liquid. 【0007】 A method for detecting liquid replenishment in a work vehicle according to a third aspect of this disclosure includes measuring the amount of liquid in a tank, outputting an alarm sound when the amount of liquid per unit time is increasing, and stopping the output of the alarm sound when the amount of liquid per unit time is not increasing. [Effects of the Invention] 【0008】 The technology disclosed herein provides a work vehicle that notifies the replenishment of liquid while refueling or urea solution is being refueled. Furthermore, it provides a work vehicle that notifies the replenishment of fuel or urea solution in a manner distinct from that of the other. [Brief explanation of the drawing] 【0009】 [Figure 1] Figure 1 is a side view of the work vehicle. [Figure 2] Figure 2 is a top view of the work vehicle. [Figure 3] Figure 3 is a block diagram of the work vehicles. [Figure 4] Figure 4 shows an example of a configuration in which the amount of fuel and the amount of urea solution can be identified solely by the output interval of the fuel replenishment notification sound and the output interval of the urea solution replenishment notification sound. [Figure 5] Figure 5 shows an example of a method in which the distinction between the fuel replenishment notification sound and the urea solution replenishment notification sound is made by the interval between sound outputs, and the audible frequency spectrum is changed according to the remaining amount. [Figure 6] Figure 6 shows an example in which the audible frequency spectrum of the fuel replenishment notification sound and the audible frequency spectrum of the urea solution replenishment notification sound are made different from each other, and the sound output interval is changed according to the frequency spectrum of the fuel replenishment notification sound, the urea solution replenishment notification sound, and the remaining amount. [Figure 7] Figure 7 shows the display screen of the display. [Figure 8] Figure 8 is a flowchart showing the operation of the controller of the work vehicle according to the embodiment. 【0010】 The present invention will be described in detail below with reference to the drawings illustrating its embodiments. In the drawings, the same reference numerals indicate corresponding or substantially identical components. <First Embodiment> <Overall Structure> 【0011】 Referring to Figures 1 and 2, the work vehicle 1, for example, a compact track loader, comprises a vehicle body 2, a pair of running gears 3, and a work device 4. The vehicle body 2 supports the running gears 3 and the work device 4. In the illustrated embodiment, the running gears 3 are tracked running gears. Thus, each of the pair of running gears 3 includes a drive wheel 31, driven wheels 32, 33, and idler wheels 34, which are driven by a hydraulic motor device 30. However, each of the pair of running gears 3 is not limited to tracked running gears. Each of the pair of running gears 3 may be, for example, a front-wheel / rear-wheel running gear, or a running gear having front wheels and a rear crawler. The work device 4 includes work equipment (bucket) 41 at the distal end of the work device 4. The proximal end of the work device 4 is attached to the rear of the vehicle body 2. The work device 4 includes a pair of arm assemblies 42 for rotatably supporting the bucket 41 via a bucket pivot shaft 43. Each of the pair of arm assemblies 42 includes a link 44 and an arm 45. 【0012】 Link 44 is rotatable with respect to the vehicle body 2 around a fulcrum shaft 46. Arm 45 is rotatable with respect to link 44 around a joint shaft 47. The working device 4 further includes a plurality of arm cylinders 48 and at least one equipment cylinder 49. Each of the plurality of arm cylinders 48 is rotatably connected to the vehicle body 2 and the arm 45, and moves links 44 and arm 45 etc. to raise and lower the bucket 41. At least one equipment cylinder 49 is configured to tilt the bucket 41. The vehicle body 2 includes a cabin 5. The cabin 5 has an openable and closable front window 51, and its outer shape is defined by a cab frame 53. The front window 51 may be omitted. The work vehicle 1 includes a driver's seat 54 and an operation lever 55 in the cabin 5. The cab frame 53 is rotatable around rotational shafts RSL and RSR on the vehicle body 2 as shown in FIG. 2. In FIGS. 1 and 2, a common pivot A defined by the rotational shafts RSL and RSR U , R , W , L , , D , H is illustrated. That is, the cab frame 53 is pivotally attached to the vehicle body 2 around the pivot A XC in a rotatable manner. 【0013】 In the embodiment according to the present application, the front-rear direction D FB (front direction D F / rear direction D B ) means the front-rear direction (front direction / rear direction) as viewed from an operator seated in the driver's seat 54 of the cabin 5. The left direction D L , the right direction D R , and the width direction D W mean the left direction, the right direction, and the left-right direction, respectively, as viewed from the operator. The upward direction D U , the downward direction D D , and the height direction D H mean the upward direction, the downward direction, and the height direction, respectively, as viewed from the operator. The front-rear / left-right (width) / up-down (height) directions of the work vehicle 1 shall coincide with the front-rear / left-right (width) / up-down (height) directions as viewed from the operator, respectively. 【0014】 FIG. 1 shows the left side of the work vehicle 1. As shown in FIG. 2, the vehicle body 2 is generally symmetric with respect to the vehicle body center plane M, and includes a first side surface 2L which is the left side surface and a second side surface 2R which is the right side surface. Among the pair of traveling devices 3, the traveling device 3 provided on the first side surface 2L is shown as the first traveling device 3L, and the traveling device 3 provided on the second side surface 2R is shown as the second traveling device 3R. Among the pair of arm assemblies 42, the arm assembly 42 provided on the left side with respect to the vehicle body center plane M is shown as the first arm assembly 42L, and the arm assembly 42 provided on the right side with respect to the vehicle body center plane M is shown as the second arm assembly 42R. The link 44 provided on the left side with respect to the vehicle body center plane M is shown as the first link 44L. The arm 45 provided on the left side with respect to the vehicle body center plane M is shown as the first arm 45L, and the arm 45 provided on the right side with respect to the vehicle body center plane M is shown as the second arm 45R. The fulcrum shaft 46 provided on the left side with respect to the vehicle body center plane M is shown as the first fulcrum shaft 46L, and the fulcrum shaft 46 provided on the right side with respect to the vehicle body center plane M is shown as the second fulcrum shaft 46R. The joint shaft 47 provided on the left side with respect to the vehicle body center plane M is shown as the first joint shaft 47L, and the joint shaft 47 provided on the right side with respect to the vehicle body center plane M is shown as the second joint shaft 47R. Among the hydraulic motor devices 30, the hydraulic motor device 30 provided on the left side with respect to the vehicle body center plane M is shown as the first hydraulic motor device 30L, and the hydraulic motor device 30 provided on the right side with respect to the vehicle body center plane M is shown as the second hydraulic motor device 30R. 【0015】 Referring to FIGS. 1 and 2, the work vehicle 1 further includes an engine 6 provided at the rear of the vehicle body 2, and a plurality of hydraulic pumps 7 including a first hydraulic pump 7L and a second hydraulic pump 7R. The engine 6 drives the plurality of hydraulic pumps 7. The first hydraulic pump 7L and the second hydraulic pump 7R are configured to discharge hydraulic oil to drive a hydraulic motor device 30 that drives drive wheels 31 and the like. The plurality of hydraulic pumps 7 other than the first hydraulic pump 7L and the second hydraulic pump 7R are configured to discharge hydraulic oil to drive hydraulic actuators (a plurality of arm cylinders 48, at least one implement cylinder 49, etc.) connected to the work device 4. The engine 6 is in the width direction D of the work vehicle 1 W and is provided between a pair of arm assemblies 42. The work vehicle 1 further includes a cover 8 for covering the engine 6. The work vehicle 1 further includes a bonnet cover 9 provided at the rear end of the vehicle body 2. The bonnet cover 9 is openable and closable, and a maintenance worker can perform maintenance work on the engine 6 and the like 【0016】 On the left and right sides of the plurality of hydraulic pumps 7, a hydraulic oil tank 20 and a fuel tank 25 are mounted. The hydraulic oil tank 20 is a tank that stores hydraulic oil for operating the above-described hydraulic actuators, and is provided on the right side of the plurality of hydraulic pumps 7. The hydraulic oil tank 20 has a hydraulic oil tank body 21, a supply pipe 22, and a cap 23. The fuel tank 25 is a tank that stores fuel for the engine 6, and is provided on the left side of the plurality of hydraulic pumps 7. The fuel tank 25 extends forward from the left side in front of the engine 6. The fuel tank 25 has a fuel tank body 26, a fuel supply pipe 27, and a cap 28. The fuel tank body 26 is configured to store fuel. The fuel supply pipe 27 extends upward and leftward from a midpoint in the front-rear direction on the upper surface of the fuel tank body 26. As shown in FIG. 1, the supply port 27a of the fuel supply pipe 27 is located above the first side surface 2L of the vehicle body 2. Fuel is supplied from the supply port 27a. The supply port 27a is openably and closably plugged by the cap 28 【0017】 The work vehicle 1 further comprises a diesel particulate filter (not shown), a selective catalytic reduction catalyst 60, and a urea water tank 61. The diesel particulate filter removes particulate matter from the exhaust of the engine 6. The selective catalytic reduction catalyst 60 is connected to the exhaust port of the engine 7 via the diesel particulate filter and reduces nitrogen oxides in the exhaust from the engine 6. This reduction reaction occurs when the urea water stored in the urea water tank 61 reacts with ammonia gas hydrolyzed by the heated exhaust from the engine 6 and nitrogen oxides in the exhaust. The urea water tank 61 is located at the rear end of the vehicle body 2, behind and to the right of the engine 6. Also, as shown in Figure 1, the urea water tank 61 is located below the first arm assembly 42L. The urea water tank 61 has a urea water tank body 62, a refill port 63, and a cap 64. The urea water tank body 62 is configured to store urea water. The replenishment port 63 is located on the upper surface of the urea water tank body 62. Urea water is supplied through the replenishment port 63. The replenishment port 63 is closed and closed by a cap 64. The first side surface 2L of the vehicle body 2 is provided with an opening 2La for accessing the replenishment port 63 and cap 64 from outside the vehicle. 【0018】 Figure 3 is a block diagram of the work vehicle 1. Referring to Figure 3, the work vehicle 1 further comprises a power supply BT, a controller 10, a speaker 11, a display 12, a headlight 15, a taillight 16, a switch 17, a fuel quantity detection sensor 18, and a urea solution quantity detection sensor 19. The fuel quantity detection sensor 18 is installed in the fuel tank 25 and is configured to measure the amount of fuel in the fuel tank 25. Preferably, the fuel quantity detection sensor 18 is a liquid level sensor that measures the liquid level in the fuel tank 25. However, the fuel quantity detection sensor 18 may also be a weight sensor. 【0019】 The urea water volume detection sensor 19 is installed in the urea water tank 61 and is configured to measure the amount of urea water in the urea water tank 61. Preferably, the urea water volume detection sensor 19 is a liquid level sensor that measures the liquid level in the urea water tank 61. However, the urea water volume detection sensor 19 may also be a weight sensor. The speaker 11 is configured to output a fuel replenishment notification sound and a urea water replenishment notification sound that is different from the fuel replenishment notification sound. Here, "different sound" means that either the frequency spectrum in the audible range or the interval between the intermittently emitted sound outputs is different. The audible range refers to frequencies such as 20 Hz to 20 kHz. "Intermittently emitting sound" means that the output and non-output of sound are switched at a frequency of 20 times or less per second. In the following embodiments, one of the fuel replenishment notification sound and the urea water replenishment notification sound may simply be called the notification sound, and the other may be called the additional notification sound. Also, it is simply referred to as the notification sound. 【0020】 The controller 10 is configured to receive the output of the fuel quantity detection sensor 18 and, when the amount of fuel per unit time detected by the fuel quantity detection sensor 18 is increasing, to output a refueling notification sound from the speaker 11, and to stop outputting the refueling notification sound when the amount of fuel per unit time detected by the fuel quantity detection sensor 18 is not increasing. The controller 10 is configured to receive the output of the urea solution quantity detection sensor 19 and, when the amount of urea solution per unit time detected by the urea solution quantity detection sensor 19 is increasing, to output a urea solution replenishment notification sound from the speaker 11, and to stop outputting the urea solution replenishment notification sound when the amount of urea solution per unit time detected by the urea solution quantity detection sensor 19 is not increasing. 【0021】 Controller 10 changes the first characteristic of the refueling notification sound according to the amount of fuel. Controller 10 also changes the first characteristic of the urea solution refueling notification sound according to the amount of urea solution. This first characteristic is a sound characteristic that is either the frequency spectrum in the audible range or the output interval of the intermittently emitted sound. The refueling notification sound and the urea solution refueling notification sound have different second characteristics. This second characteristic is also a sound characteristic that is either the frequency spectrum in the audible range or the output interval of the intermittently emitted sound. Note that the first and second characteristics are different to a degree that a person can distinguish them as different sounds. Figure 4 shows an example of sound output when both the first and second characteristics are sound output intervals. 【0022】 Figure 4 shows an example of a system that allows the amount of fuel and the amount of urea solution to be distinguished solely by the output intervals of the fuel replenishment alarm sound and the urea solution replenishment alarm sound. In the example in Figure 4, while the fuel replenishment alarm sound is output continuously with the same frequency spectrum in the audible range, the urea solution replenishment alarm sound is output, not output, and output at 0.1-second intervals, making it possible to distinguish between the two sounds. For both the fuel replenishment alarm sound and the urea solution replenishment alarm sound, when the remaining amount is low, the sound is output at 2-second intervals, when the remaining amount is in the middle, the sound is output at 1.33-second intervals, and when the remaining amount is high, the sound is output at 1-second intervals. Note that these time intervals are merely examples and other time intervals may be used. In this way, even if the sounds have the same frequency spectrum in the audible range, outputting them at different time intervals makes it possible to distinguish between fuel and urea solution, as well as their respective amounts. 【0023】 In another embodiment, the fuel replenishment notification sound and the urea solution replenishment notification sound are distinguished by the interval between sound outputs, and the audible frequency spectrum of the sound is changed according to the remaining amount. Figure 5 shows an example of such an embodiment. In the example in Figure 5, the pitch of the sound is raised as the amount of liquid increases, that is, the level of the higher frequencies is increased. Also, in the example in Figure 5, the fuel replenishment notification sound is output at 1-second intervals, while the urea solution replenishment notification sound is output / not output / output at 0.1-second intervals, making it possible to distinguish between the two sounds. Note that this time interval is merely an example, and other time intervals may be used. 【0024】 In a preferred embodiment, the audible frequency spectrum of the fuel replenishment notification sound and the audible frequency spectrum of the urea solution replenishment notification sound are made different from each other, and the sound output interval is changed according to the frequency spectrum of the fuel replenishment notification sound, the urea solution replenishment notification sound, and the remaining amount. Figure 6 shows an example of such an embodiment. In the example in Figure 6, when the remaining amount is low, both the fuel replenishment notification sound and the urea solution replenishment notification sound are emitted continuously for 1 second at 2-second intervals, when the remaining amount is in the middle, they are emitted continuously for 0.67 seconds at 1.33-second intervals, and when the remaining amount is high, they are emitted for 0.5 seconds at 1-second intervals. Note that these time intervals are merely examples and other time intervals may be used. Furthermore, it is desirable to use sounds that are commonly used as buzzer sounds for both the fuel replenishment notification sound and the urea solution replenishment notification sound. 【0025】 Furthermore, if the fuel level exceeds a predetermined threshold (for example, 100% level near full), a fuel warning sound is emitted that differs from the refueling notification sound in terms of the first or second characteristic described above. If the urea solution level exceeds a predetermined threshold (for example, 100% level near full), a urea solution warning sound is emitted that differs from the urea solution refueling notification sound in terms of the first or second characteristic described above. In a typical example, the fuel warning sound may be emitted by continuously outputting the refueling notification sound for a certain period of time (for example, 5 seconds). Alternatively, the fuel warning sound may be emitted by continuously outputting a sound that differs only in volume from the refueling notification sound (i.e., the relative highs and lows of the levels of each frequency are not changed, only the height of the level is changed). The urea solution warning sound may be emitted by continuously outputting the urea solution refueling notification sound for a certain period of time (for example, 5 seconds). Alternatively, the urea solution warning sound may be emitted by continuously outputting a sound that differs only in volume from the urea solution replenishment notification sound. Or, the fuel warning sound and urea solution warning sound may be different buzzer sounds from the fuel replenishment notification sound and the urea solution replenishment notification sound. 【0026】 Figure 7 shows the display screen of the display 12. As shown in Figure 7, the display 12 is configured to display a fuel indicator 13 that shows the amount of fuel and a urea solution indicator 14 that shows the amount of urea solution. The controller 10 is configured to make the fuel indicator 13 on the display 12 blink when the amount of fuel per unit time is increasing, and to stop blinking the fuel indicator 13 when the amount of fuel per unit time is not increasing. Preferably, the controller 10 shortens the interval between flashes of the fuel indicator 13 as the amount of fuel increases, similar to the refueling notification sound described above. The controller 10 is configured to make the urea solution indicator 14 on the display 12 blink when the amount of urea solution per unit time is increasing, and to stop blinking the urea solution indicator 14 when the amount of urea solution per unit time is not increasing. Preferably, the controller 10, similar to the urea solution replenishment notification sound described above, shortens the interval between the illumination of the urea solution indicator 14 as the amount of urea solution increases. 【0027】 The headlights 15 and taillights 16 are configured to illuminate the area around the work vehicle 1. More specifically, the headlights 15 are configured to illuminate the area in front of the work vehicle 1. The taillights 16 are configured to illuminate the area behind the work vehicle 1. The controller 10 is configured to flash one of the headlights 15 or taillights 16 when the amount of fuel per unit time is increasing, and to stop flashing one of the headlights 15 or taillights 16 when the amount of fuel per unit time is not increasing. Preferably, the controller 10, similar to the fuel refueling notification sound described above, shortens the interval between flashing of one of the headlights 15 or taillights 16 as the amount of fuel increases. The controller 10 is configured to flash the other of the headlights 15 and taillights 16 when the amount of urea solution per unit time increases, and to stop flashing the other of the headlights 15 and taillights 16 when the amount of urea solution per unit time does not increase. Preferably, the controller 10, similar to the urea solution replenishment notification sound described above, shortens the interval between the flashing of the other of the headlights 15 and taillights 16 as the amount of urea solution increases. 【0028】 In subsequent embodiments, one of the fuel tank 25 and the urea water tank 61 may be referred to as the "tank," and the other as the "additional tank." Of the fuel and urea water, the liquid stored in the tank may be simply referred to as the "liquid," and the liquid stored in the additional tank may be referred to as the "additional liquid." Of the fuel quantity detection sensor 18 and the urea water quantity detection sensor 19, the sensor that detects the liquid level in the tank may be referred to as the "liquid quantity detection sensor," and the sensor that detects the liquid level in the additional tank may be referred to as the "additional liquid quantity detection sensor." 【0029】 Of the fuel replenishment notification sound and the urea solution replenishment notification sound, the notification sound whose output is changed according to the amount of liquid detected by the liquid level detection sensor may be simply called the notification sound, and the notification sound whose output is changed according to the amount of liquid detected by the additional liquid level detection sensor may be called the additional notification sound. Of the fuel warning sound and the urea solution warning sound, the warning sound indicating that the tank is nearly full may be simply called the warning sound, and the warning sound indicating that the additional tank is full may be called the additional warning sound. 【0030】 Furthermore, of the fuel indicator 13 and the urea water indicator 14, the indicator that displays the liquid level in the tank may be simply called the indicator, and the indicator that displays the liquid level in the additional tank may be called the additional indicator. Of the headlights 15 and taillights 16, the light that flashes when the liquid level in the tank is increasing may be called the work light, and the light that flashes when the liquid level in the additional tank is increasing may be called the additional work light. 【0031】 The controller 10 consists of an ECU (Electric Control Unit). To realize the above processing, the controller 10 has a processor 10a, a memory 10m, and a bus 10b as shown in Figure 3. The memory 10m includes volatile memory and non-volatile memory. The memory 10m includes a notification program 10c (not shown) for realizing the above-mentioned control. The processor 10a executes the above-mentioned control while executing the notification program 10c. The bus 10b connects the processor 10a and the memory 10m. The processor 10a, memory 10m, and bus 10b are electronic circuits. The bus 10b is connected to the speaker 11, headlight 15, taillight 16, switch 17, fuel quantity detection sensor 18, urea water quantity detection sensor 19 via a well-known external interface (USB, RS-232C, etc., not shown). 【0032】 The controller 10 further includes a switch circuit 10d. The switch circuit 10d is connected to the power supply BT and is configured to switch whether or not to supply electricity from the power supply BT to the electronic circuit described above. That is, the power supply BT is configured to supply electricity to the electronic circuit described above. Hereinafter, the state in which the switch circuit 10d is supplying electricity from the power supply BT to the electronic circuit described above will be described as the power ON state, and the state in which no electricity is supplied from the power supply BT to the electronic circuit described above will be described as the power OFF state. The switch circuit 10d is connected to the switch 17 via the bus 10b. When the switch 17 is pressed while the power is OFF, the switch circuit 10d switches to the power ON state. When the switch 17 is pressed while the power is ON, the controller 10 displays a power OFF confirmation prompt on the display 12, and when the operation button such as the switch 17 is operated, the switch circuit 10d switches to the power OFF state. Note that the confirmation prompt may be omitted, and the controller 10 may immediately switch to the power OFF state when the switch 17 is pressed while the power is ON. Furthermore, the processor 10a (part of the electronic circuit described above) is configured to send a signal to switch off the supply of electricity to the switch circuit 10d when a predetermined time has elapsed since the amount of the liquid described above stopped increasing. This predetermined time is, for example, 10 minutes. 【0033】 Figure 8 is a flowchart showing the operation of the controller 10 of the work vehicle 1. In step S1, the switch circuit 10d of the controller 10 detects that the switch 17 has been pressed and switches to the power ON state. This supplies power to the processor 10a and memory 10m, and the notification program 10c is started. In step S2, the processor 10a, which executes the notification program 10c, determines whether both caps 28 and 64 have been opened based on signals from sensors attached to the refueling port 27a and / or cap 28, and the refueling port 63 and / or cap 64 (for example, sensors that detect opening and closing based on electrical contact between the refueling port and the cap). If both caps 28 and 64 have been opened (Yes in step S2), in step S3, the processor 10a causes the speaker 11 to output an open warning sound. The open warning sound may be the same as either the fuel warning sound or the urea water warning sound, or it may be a different buzzer sound. Steps S2 and S3 may be omitted. 【0034】 Next, in step S4A, the controller 10 (processor 10a that executes the notification program 10c) measures the amount of liquid (either fuel or urea solution) in the tank (either the fuel tank 25 or the urea solution tank 61) based on a signal from the liquid level detection sensor (either the fuel level detection sensor 18 or the urea solution level detection sensor 19). In step S4B, the controller 10 (processor 10a that executes the notification program 10c) measures the amount of additional liquid (either fuel or urea solution) in the additional tank (the other of the fuel tank 25 or the urea solution tank 61) based on a signal from the additional liquid level detection sensor (the other of the fuel level detection sensor 18 or the urea solution level detection sensor 19). 【0035】 In step S5A, the controller 10 (processor 10a executing the notification program 10c) determines whether the amount of liquid per unit time is increasing. If the amount of liquid per unit time is increasing (Yes in step S5A), in step S6A, the controller 10 (processor 10a executing the notification program 10c) determines whether the amount of liquid exceeds a predetermined threshold. If the amount of liquid exceeds the predetermined threshold (Yes in step S6A), in step S7A, the controller 10 (processor 10a executing the notification program 10c) causes the speaker 11 to output a warning sound. After the completion of step S7A, the process returns to step S2. If the amount of liquid does not exceed the predetermined threshold (No in step S6A), in step S8A, the controller 10 (processor 10a executing the notification program 10c) causes the speaker 11 to output a notification sound corresponding to the amount of liquid. In step S9A, the controller 10 (processor 10a that executes the notification program 10c) flashes one of the indicators (fuel indicator 13 and urea water indicator 14) according to the amount of liquid. In step S10A, the controller 10 (processor 10a that executes the notification program 10c) flashes one of the work lights (headlight 15 and taillight 16) according to the amount of liquid. After step S10A is completed, the process returns to step S2. 【0036】 If the amount of liquid per unit time is not increasing (No in step S5A), in step S5B, the controller 10 (processor 10a executing the notification program 10c) determines whether the amount of additional liquid per unit time is increasing. If the amount of additional liquid per unit time is not increasing (No in step S5B), the process proceeds to step S11. If the amount of additional liquid per unit time is increasing (Yes in step S5B), in step S6B, the controller 10 (processor 10a executing the notification program 10c) determines whether the amount of additional liquid exceeds a predetermined threshold. If the amount of additional liquid exceeds a predetermined threshold (Yes in step S6B), in step S7B, the controller 10 (processor 10a executing the notification program 10c) outputs an additional warning sound to the speaker 11. After the completion of step S7B, the process returns to step S2. If the amount of added liquid does not exceed a predetermined threshold (No in step S6B), in step S8B, the controller 10 (processor 10a executing the notification program 10c) causes the speaker 11 to output an additional notification sound corresponding to the amount of added liquid. In step S9B, the controller 10 (processor 10a executing the notification program 10c) flashes an additional indicator (the other of the fuel indicator 13 and the urea water indicator 14) according to the amount of added liquid. In step S10B, the controller 10 (processor 10a executing the notification program 10c) flashes a work light (the other of the headlight 15 and the taillight 16) according to the amount of added liquid. After the completion of step S10B, the process returns to step S2. 【0037】 In step S11, the controller 10 (processor 10a executing the notification program 10c) determines whether the state in which the amount of liquid and the amount of added liquid have not increased has continued for a predetermined time or longer, or whether the switch 17 has not been pressed again. If the state in which the amount of liquid and the amount of added liquid have not increased has continued for a predetermined time or longer, or if the switch 17 has been pressed again (Yes in step S11), the controller 10 (processor 10a executing the notification program 10c) terminates the notification program 10c in step S12, sends a signal (power OFF signal) to switch off the supply of power to the switch circuit 10d, and terminates. If the state in which the amount of liquid and the amount of added liquid have not increased has not continued for a predetermined time or longer, or if the switch 17 has not been pressed again (No in step S11), the process returns to step S2. <Effects and Effects of the Embodiment> 【0038】 The control method for the work vehicle 1 according to this embodiment, or the processing by the controller 10 of the work vehicle 1, includes measuring the amount of liquid (either fuel or urea solution) in the tank (either the fuel tank 25 or the urea solution tank 61), outputting a notification sound when the amount of liquid per unit time is increasing, and stopping the output of the notification sound when the amount of liquid per unit time is not increasing. This makes it possible to provide a work vehicle 1 that notifies the replenishment of liquid while refueling or urea solution is being replenished. <Variation> 【0039】 In the above embodiment, the work vehicle 1 is shown to notify the liquid level of the fuel tank 25 and the liquid level of the urea water tank 61, but it may also notify the liquid level of the hydraulic oil in the hydraulic oil tank 20. In this case, it is desirable that the work vehicle 1 outputs a hydraulic oil replenishment notification sound in a manner that can be distinguished from the fuel replenishment notification sound and the urea water replenishment notification sound. Alternatively, the work vehicle 1 may notify the liquid level of the hydraulic oil in the hydraulic oil tank 20 instead of either the liquid level of the fuel tank 25 or the liquid level of the urea water tank 61. Or, the work vehicle 1 may notify either the liquid level of the fuel tank 25 or the liquid level of the urea water tank 61. In that case, steps S2, S3, S4B, S5B, S6B, S7B, S8B, S9B, and S10B in Figure 8 may be omitted. In this case, in the flowchart explanation described above, replace "return to step S2" with "return to step S4A," and if the answer in step S5A is Yes, proceed to step S11. 【0040】 In this application, “equipped with” and its derivatives are non-restrictive terms that describe the existence of a component and do not exclude the existence of other components not described. This also applies to “having,” “including,” and their derivatives. 【0041】 The terms "~member," "~part," "~element," "~body," and "~structure" can have multiple meanings, such as a single part or multiple parts. 【0042】 Ordinal numbers such as "1st" and "2nd" are simply terms used to identify components and do not carry any other meaning (such as a specific order). For example, the existence of a "1st element" does not implicitly mean the existence of a "2nd element," nor does the existence of a "2nd element" implicitly mean the existence of a "1st element." 【0043】 Unless otherwise specifically stated in the embodiments, terms such as "substantially," "about," and "approximately" can mean a reasonable deviation that does not significantly alter the final result. All numerical values ​​described in this application may be interpreted as including terms such as "substantially," "about," and "approximately." 【0044】 In this application, the phrase "at least one of A and B" should be interpreted to include A only, B only, and both A and B. 【0045】 Based on the above disclosure, it is clear that various changes and modifications to the present invention are possible. Therefore, the present invention may be implemented in a manner different from the specific disclosures of this application, without departing from the spirit of the invention.

Claims

[Claim 1] A tank for storing liquid, An additional tank for storing an additional liquid of a different type from the aforementioned liquid, A liquid volume detection sensor is provided inside the tank and configured to measure the amount of liquid inside the tank. An additional liquid volume detection sensor is provided in the additional tank and is configured to measure the amount of the additional liquid in the additional tank. A speaker configured to output a notification sound, and an additional notification sound having a second characteristic different from the aforementioned notification sound, An electronic circuit configured to output the notification sound from the speaker when the amount of liquid per unit time detected by the liquid volume detection sensor is increasing, to stop outputting the notification sound when the amount of liquid per unit time detected by the liquid volume detection sensor is not increasing, to output the additional notification sound from the speaker when the amount of additional liquid per unit time detected by the additional liquid volume detection sensor is increasing, to stop outputting the additional notification sound when the amount of liquid per unit time detected by the additional liquid volume detection sensor is not increasing, to change the first characteristic of the notification sound according to the amount of liquid, and to change the first characteristic of the additional notification sound according to the amount of additional liquid, Equipped with, The first characteristic is one of the audible frequency spectrum and the interval between intermittently emitted sound outputs. The second characteristic is the other of the audible frequency spectrum and the output interval. Work vehicle. [Claim 2] The system further comprises a display configured to show an indicator that displays the amount of the liquid, The electronic circuit is configured to blink the indicator on the display when the amount of liquid per unit time is increasing, and to stop blinking the indicator when the amount of liquid per unit time is not increasing. The work vehicle according to claim 1. [Claim 3] The work vehicle is further equipped with work lights configured to illuminate the surrounding area. The electronic circuit is configured to flash the work light when the amount of liquid per unit time is increasing, and to stop flashing the work light when the amount of liquid per unit time is not increasing. The work vehicle according to claim 1. [Claim 4] When the amount of the liquid exceeds a predetermined threshold, a warning sound is emitted that is different from the notification sound, depending on whether the first or second characteristic is different. The work vehicle according to claim 1. [Claim 5] The greater the amount of liquid, the shorter the interval between the lights on the indicator. The work vehicle according to claim 2. [Claim 6] The greater the amount of the liquid, the shorter the interval between flashes of the work light. The work vehicle according to claim 3. [Claim 7] The system further includes a display that shows the amount of the liquid and an additional display that shows the amount of the added liquid. The aforementioned electronic circuit is When the amount of liquid per unit time is increasing, the display will blink the indicator on the display. When the amount of liquid per unit time does not increase, the flashing of the indicator is stopped. When the amount of the additional liquid per unit time is increasing, the additional indicator on the display will blink. The system is configured to stop flashing the additional indicator when the amount of additional liquid per unit time does not increase. The work vehicle according to claim 1. [Claim 8] The system further comprises a work light configured to illuminate the area around the work vehicle, and an additional work light, different from the work light, configured to illuminate the area around the work vehicle. The electronic circuit flashes the work light when the amount of liquid per unit time increases, and stops flashing the work light when the amount of liquid per unit time does not increase. When the amount of the additional liquid per unit time increases, the additional work light is flashed. The system is configured to stop flashing the additional work light when the amount of the additional liquid per unit time does not increase. The work vehicle according to claim 1. [Claim 9] When the amount of the additional liquid exceeds a predetermined additional threshold, an additional warning sound is emitted in which the first characteristic or the second characteristic differs from the additional notification sound. The work vehicle according to claim 1. [Claim 10] The larger the amount of liquid, the shorter the interval between the lights on the indicator. The greater the amount of the additional liquid, the shorter the interval between the lights on the additional indicator. The work vehicle according to claim 7. [Claim 11] The larger the amount of the liquid, the shorter the interval between flashes of the work light. The greater the amount of the additional liquid, the shorter the interval between flashes of the additional work light. The work vehicle according to claim 8. [Claim 12] The aforementioned liquid is one of fuel and urea solution, The aforementioned additional liquid is the other of fuel and urea solution. A work vehicle according to any one of claims 1 to 11. [Claim 13] A power supply configured to supply electricity to the aforementioned electronic circuit, A switch circuit configured to switch whether or not to supply the aforementioned electricity to the aforementioned electronic circuit, Furthermore, The electronic circuit is configured to send a signal to switch off the supply of electricity to the switch circuit when a predetermined time has elapsed since the amount of liquid stopped increasing. A work vehicle according to any one of claims 1 to 11. [Claim 14] The work vehicle according to any one of claims 1 to 11, wherein the liquid volume detection sensor is a liquid level sensor that measures the liquid level in the tank. [Claim 15] A tank for storing liquid, An additional tank for storing an additional liquid of a different type from the aforementioned liquid, A liquid volume detection sensor is provided inside the tank and configured to measure the amount of liquid inside the tank. An additional liquid volume detection sensor is provided in the additional tank and configured to measure the amount of the additional liquid in the additional tank, A speaker configured to output an alert sound, and an additional alert sound in which one of the characteristics of the audible frequency spectrum and the intermittent output interval of the sound differs from that of the alert sound, An electronic circuit configured to output the notification sound from the speaker according to the amount of the liquid, and to output the additional notification sound from the speaker according to the amount of the additional liquid, A work vehicle equipped with the following features. [Claim 16] The amount of liquid in the tank and the amount of additional liquid of a different type from the aforementioned liquid in the additional tank are measured. When the amount of liquid per unit time is increasing, an alarm sound is emitted. When the amount of the additional liquid per unit time increases, an additional notification sound with a second characteristic different from the notification sound is output. When the amount of liquid per unit time does not increase, the output of the notification sound is stopped. When the amount of the additional liquid per unit time does not increase, the output of the additional alarm sound is stopped. The first characteristic of the notification sound is changed according to the amount of the liquid. The first characteristic of the additional notification sound is changed according to the amount of the additional liquid. This includes, The first characteristic is one of the audible frequency spectrum and the interval between intermittently emitted sound outputs. The second characteristic is the other of the audible frequency spectrum and the output interval. A method for detecting liquid replenishment in work vehicles.

Images