Combine

Abstract

To provide a combine-harvester capable of suitably correcting a measurement result of an amount of moisture of grain by a moisture sensor.SOLUTION: When an external measurement value, which is a value of an amount of moisture of grain measured by an external device, is input to a controller 71 from the external device (S11:YES), the controller 71 compares the external measurement value with a sensor measurement value, which is the average value of amount of moisture acquired after stop of a reaping device 7 and a threshing device. When the external measurement value is separated from the sensor measurement value (S12:YES) or when a difference between the external measurement value and the sensor measurement value is equal to or larger than a given value, the controller 71 takes the external measurement value as a reference value and corrects the sensor measurement value so as to reduce the difference between the external measurement value and the sensor measurement value, for example, so that the sensor measurement value becomes a value equal to the external measurement value (S13).SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a combine harvester. [Background technology]

[0002] In a combine harvester, the base of the stalks of grain planted in the field is cut by a reaping device, and the cut stalks are transported from the reaping device to a thresher, where they are threshed. Grains such as rice that have fallen off the stalks are transported from the thresher to a discharge section installed at the top of the grain tank, and are discharged from the discharge section into the grain tank.

[0003] Some combine harvesters are equipped with a moisture sensor (moisture meter) for measuring the amount of moisture contained in harvested grains. The moisture sensor is configured to, for example, rotate a pair of electrode rollers in a direction that wraps around the grains, crush the grains between the electrode rollers, and detect the electrical resistance value between the electrode rollers at that time, and the amount of moisture contained in the grains can be determined from the electrical resistance value (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6451513 Summary of the Invention [Problem to be solved by the invention]

[0005] Grain harvested by a combine harvester is transported to a dryer for drying. The dryer is equipped with a moisture sensor that measures the moisture content of the grain, and the drying operation of the dryer is set based on the moisture content measured by the moisture sensor. Therefore, for grain harvested by a combine harvester equipped with a moisture sensor, the moisture content is measured both by the combine harvester and the dryer. In this case, if the moisture content measured by the combine harvester differs from the moisture content measured by the dryer, users cannot trust the measurement results.

[0006] An object of the present invention is to provide a combine harvester that can accurately correct the measurement result of the moisture content of grain by a moisture sensor.

Means for Solving the Problems

[0007] To achieve the above object, a combine harvester according to the present invention includes a moisture sensor for measuring the moisture content of grain, and compares a sensor measurement value, which is a value of the moisture content measured using the moisture sensor, with a reference value input from an external device, and a control device that generates correction information for correcting the sensor measurement value so that the deviation between the sensor measurement value and the reference value becomes small.

[0008] According to this configuration, the sensor measurement value, which is the value of the moisture content measured using the moisture sensor, is compared with the reference value input from the external device, and correction information for correcting the sensor measurement value so that the deviation between the sensor measurement value and the reference value becomes small is generated. Therefore, the sensor measurement value can be accurately corrected using the correction information, and by this correction, the deviation between the sensor measurement value and the reference value can be reduced.

[0009] The combine harvester may be provided with a monitor for displaying information.

[0010] The control device may display the corrected sensor measurement value on the monitor after correcting the sensor measurement value using the correction information, or may display the correction information on the monitor without correcting the sensor measurement value.

[0011] Further, an external measurement value, which is a value of the moisture content of the grain measured by the dryer, may be input as the reference value to the control device from a dryer that dries the grain, or the reference value may be input from a terminal or a server by network communication.

Advantages of the Invention

[0012] According to the present invention, the measurement result of the moisture content of the grain by the moisture sensor can be accurately corrected.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

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Figure 8

Figure 9

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] <Overall Configuration of Combine> FIG. 1 is a right side view of a combine 1 according to an embodiment of the present invention.

[0016] The combine 1 is an example of a harvesting machine that cuts grain straw and threshes it while traveling in a field. The combine 1 employs a pair of left and right crawlers 2 as a traveling device having the ability to travel on rough ground such as a field, and a cabin 4 and a grain tank 5 are provided on a machine body 3 supported by the pair of left and right crawlers 2.

[0017] The cabin 4 is disposed on the front end of the crawler 2. The cabin 4 provides a space for the driver inside, and within this space, for example, a driver's seat where the driver sits, and operating members such as operating levers and operating pedals are disposed. An openable door 6 is provided on the right side of the cabin 4, and the driver can open the door 6 to enter the cabin 4.

[0018] The grain tank 5 is located on the crawler 2 behind the cabin 4 .

[0019] The body 3 of the combine harvester 1 is also provided with a reaping device 7 and a thresher (not shown). The reaping device 7 is located in front of the crawler 2 and reaps culms planted in the field as the combine harvester 1 moves forward. The thresher is located to the left of the grain tank 5 and transports the base side of the culms harvested by the reaping device 7 to the rear side via a threshing feed chain, and supplies the ear side of the culms to a threshing chamber for threshing. The grains that have been removed from the culms are then transported from the thresher to the grain tank 5, where they are stored. An unloader 8 is connected to the grain tank 5, and the grains stored in the grain tank 5 can be removed by the unloader 8 and discharged outside the machine.

[0020] <Internal structure of the Glen Tank> 2 is a view of the inside of the grain tank 5 as seen from the right side. FIG. 3 is a perspective view of the upper front end inside the grain tank 5.

[0021] As shown in Figures 2 and 3, a conveying and discharging section 11 is provided at the upper front end inside the grain tank 5. As shown in Figure 3, the conveying and discharging section 11 integrally comprises a conveying section 12 that conveys grains discharged from the threshing device into the grain tank 5, and a discharging section 13 that discharges the grains conveyed by the conveying section 12 into the grain tank 5.

[0022] The conveying section 12 extends to the right from the upper front end of the left wall 14 of the grain tank 5. The conveying section 12 includes a conveying screw 16 in a substantially cylindrical conveying case 15.

[0023] The conveying case 15 is connected to the left side wall 14. In the left side wall 14, a circular opening is formed in a portion surrounded by the conveying case 15 with a diameter substantially the same as the inner diameter of the conveying case 15.

[0024] The conveying screw 16 includes a screw shaft 17 extending on the center line of the conveying case 15 and a spiral screw blade 18 supported by the screw shaft 17. The screw shaft 17 extends to the left side of the left side wall 14 through the opening of the left side wall 14. A pulley (not shown) is attached to the left end of the screw shaft 17 in a non-rotatable manner, and the conveying screw 16 rotates by the driving force input to the pulley.

[0025] The discharge part 13 is connected to the right end of the conveying part 12, is supported by the conveying part 12, and is arranged at a distance to the rear side with respect to the front wall 21 of the grease tank 5 at the central part in the left-right direction in the grease tank 5.

[0026] The discharge part 13 includes a discharge case 22. The discharge case 22 has a semi-cylindrical peripheral surface part 23 bulging forward, a plate-like upper plate part 24 extending rearward from the upper end of the peripheral surface part 23, a plate-like guide plate part 25 extending obliquely rearward and upward from the lower end of the peripheral surface part 23, and an end surface part 26 closing the space inside the peripheral surface part 23 from the right side. Between the upper plate part 24 and the guide plate part 25, it is opened as a discharge port 27 communicating the inside of the discharge case 22 with the inside of the grease tank 5.

[0027] The screw shaft 17 extends into the discharge case 22 and is rotatably inserted into the end surface part 26 of the discharge case 22. Inside the discharge case 22, two rotating blades 28 and 29 are supported on the screw shaft 17. The rotating blades 28 and 29 are each formed in a substantially rectangular plate shape and extend from the screw shaft 17 to opposite sides of each other.

[0028] The conveying screw 16 rotates in a direction in which the rotating blades 28 and 29 pass through the discharge port 27 from bottom to top. The grains sent out from the threshing device are conveyed in the conveying case 15 toward the discharge case 22 by the rotation of the screw blades 18. Then, the grains conveyed into the discharge case 22 are swept away by the rotating blades 28 and 29, and jump out from the discharge port 27 into the grain tank 5 mainly in a direction along the upper surface of the guide plate portion 25 of the discharge case 22.

[0029] Figure 4 is a perspective view of the rear end portion inside the grain tank 5.

[0030] A moisture sensor 32 for measuring the moisture content contained in the grains is attached to the rear wall 31 of the grain tank 5. The moisture sensor 32 penetrates the rear wall 31, and its front end portion is exposed into the grain tank 5 from the inner surface of the rear wall 31, that is, the rear surface 33 inside the grain tank 5. The moisture sensor 32 is disposed at a position above the center in the vertical direction and lower than the discharge port 27 of the discharge portion 13 and offset to the right of the center in the horizontal direction (a position close to the right end) on the rear surface 33. Specifically, taking the flow rate of the grains scattered from the discharge port 27 as a constant flow rate, for grains containing moisture of a certain amount or more, the arrival position on the rear surface 33 of the grains that jump out from the discharge port 27 along the guide plate portion 25 and scatter in a parabolic shape is obtained through experiments or simulations, and the moisture sensor 32 is disposed at the obtained arrival position.

[0031] Figure 5 is a perspective view of the moisture sensor 32.

[0032] The moisture sensor 32 includes a box-shaped sensor case 41. On the front surface of the sensor case 41, an inlet 42 for receiving grain into the sensor case 41 is formed. The inlet 42 has a symmetric shape, with a V-shaped lower side 43 that opens upward, a first left side 44 that extends upward at a relatively small angle to the left with respect to the vertical direction from the upper left end of the lower side 43, a second left side 45 that extends upward at a relatively large angle to the left with respect to the vertical direction from the upper end of the first left side 44, a first right side 46 that extends upward at a relatively small angle to the right with respect to the vertical direction from the upper right end of the lower side 43, and a second right side 47 that extends upward at a relatively large angle to the right with respect to the vertical direction from the upper end of the first right side 46. Planes 51, 52, 53, and 54 extend rearward from the first left side 44, the second left side 45, the first right side 46, and the second right side 47, respectively, and these planes 51, 52, 53, and 54 function as guide surfaces for guiding the grain into the sensor case 41.

[0033] Inside the sensor case 41, a pair of electrode rollers 61 and 62 are provided in the roller accommodation space behind the inlet 42. The electrode rollers 61 and 62 integrally have roller shafts 63 and 64 that extend in the front-rear direction parallel to each other. The circumferential surfaces of the electrode rollers 61 and 62 are arranged side by side close to each other in the left-right direction. A large number of minute irregularities are formed on the circumferential surfaces of the electrode rollers 61 and 62.

[0034] A DC motor (not shown) is provided inside the sensor case 41, and due to the driving force of the DC motor, the pair of electrode rollers 61 and 62 rotate forward and backward. In the forward rotation of the electrode rollers 61 and 62, as viewed from inside the grain tank 5, the electrode roller 61 rotates counterclockwise and the electrode roller 62 rotates clockwise. In the reverse rotation of the electrode rollers 61 and 62, as viewed from inside the grain tank 5, the electrode roller 61 rotates clockwise and the electrode roller 62 rotates counterclockwise.

[0035] In addition, a guide member 65 is provided inside the sensor case 41. The guide member 65 is supported so as to be relatively rotatable with respect to the roller shaft 63 of the left electrode roller 61. However, since it has an appropriate frictional resistance with the roller shaft 63, it rotates along with the roller shaft 63 when no external force other than the roller shaft 63 acts on the guide member 65. A stopper for restricting the rotation range of the guide member 65 is provided inside the sensor case 41. As a result, the guide member 65 is disposed at a position above the front of the electrode rollers 61 and 62 during the forward rotation of the electrode rollers 61 and 62, and is disposed at a position above the left of the position during the forward rotation (a position above the front left of the electrode rollers 61 and 62) during the reverse rotation of the electrode rollers 61 and 62. The guide member 65 has a substantially triangular shape in plan view and a substantially V-shaped opening upward in front view when disposed at a position above the front of the electrode rollers 61 and 62.

[0036] A part of the grains scattered from the discharge port 27 of the discharge unit 13 reaches the position of the sensor case 41 and is received into the sensor case 41 from the inlet 42 of the sensor case 41. During the forward rotation of the electrode rollers 61 and 62, since the guide member 65 is located at a position above the front of the electrode rollers 61 and 62, the grains that fly in from the inlet 42 and reach the guide member 65 are guided onto the electrode rollers 61 and 62 by the guide member 65. In addition, a part of the grains that fly into the sensor case 41 from the inlet 42 directly reaches the electrode rollers 61 and 62. Then, the grains on the electrode rollers 61 and 62 are crushed by being sandwiched between the electrode rollers 61 and 62 due to the forward rotation of the electrode rollers 61 and 62. In the moisture sensor 32, the electrical resistance value between the electrode rollers 61 and 62 during the crushing of the grains is detected, and the value of the moisture content contained in the grains is obtained from the electrical resistance value. Then, the obtained value is output from the moisture sensor 32 (detection operation).

[0037] Note that in a control device in which the electrical resistance value between the electrode rollers 61 and 62 during the crushing of the grains is output from the moisture sensor 32 and the output value of the moisture sensor 32 is input, the value of the moisture content contained in the grains may be obtained from the electrical resistance value.

[0038] Also, when the electrode rollers 61 and 62 are reversed, a brush (not shown) contacts each peripheral surface of the electrode rollers 61 and 62, and the peripheral surfaces (surfaces) of the electrode rollers 61 and 62 are cleaned (cleaning operation). At this time, since the guide member 65 has retreated to the upper left position with respect to the upper front position of the electrode rollers 61 and 62, it does not prevent the uncrushed grains from falling from above the electrode rollers 61 and 62.

[0039] The roller accommodation space in which the electrode rollers 61 and 62 are accommodated has an open bottom surface. Therefore, the grains received into the sensor case 41 from the receiving port 42 do not accumulate in the roller accommodation space except on the electrode rollers 61 and 62, and are returned to the grain tank 5 through a return passage 66 (see FIG. 4) provided below the moisture sensor 32 from the roller accommodation space.

[0040] <Electrical Configuration of the Combine> FIG. 6 is a block diagram showing a main part of the electrical configuration of the combine 1.

[0041] The combine 1 is equipped with a control device 71 for controlling the operation of the moisture sensor 32. The control device 71 is configured to include a microcontroller unit (MCU: Micro Controller Unit), and the microcontroller unit incorporates, for example, a CPU, a non-volatile memory such as a flash memory, and a volatile memory such as a DRAM (Dynamic Random Access Memory).

[0042] In addition to the value (detection signal) output from the moisture sensor 32, the control device 71 receives the on / off signal of the main key switch 72 and the detection signal of the straw sensor 73. The main key switch 72 is a switch that is turned on / off when the user inserts and operates a key into the key cylinder at the start and end of the operation of the combine 1. The straw sensor 73 is provided in the cutting device 7 and is a sensor that detects the presence of straw in the cutting device 7. The straw sensor 73 outputs a detection signal at the on level when straw is present in the cutting device 7, and outputs a detection signal at the off level when no straw is present in the cutting device 7.

[0043] Also, a monitor (display) 74 is connected to the control device 71. The control device 71 controls the monitor 74 to display various types of information to be notified to the user on the monitor 74.

[0044] Furthermore, the control device 71 is provided with a communication interface (I / F) 75 for communication with external devices (devices existing outside the combine 1). Examples of external devices include terminals such as smartphones, tablets, and PCs (Personal Computers),

[0045] a dryer for drying the grains harvested by the combine 1, a server included in a grain management system for managing the quality of the grains harvested by the combine 1, and the like.

[0046] <Sensor Drive Control> FIG. 7 is a flowchart showing the flow of drive control of the moisture sensor 32.

[0047] When the main key switch 72 is turned on, the control device 71 starts controlling the drive (operation) of the moisture sensor 32. The drive control of the moisture sensor 32 continues until the main key switch 72 is turned off.

[0048] In the drive control of the moisture sensor 32, in response to the main key switch 72 being turned on, the DC motor of the moisture sensor 32 is controlled so that the electrode rollers 61 and 62 are reversed for a predetermined normal time (step S1). As a result, the moisture sensor 32 performs a cleaning operation for the normal time. By the cleaning operation, the peripheral surfaces of the electrode rollers 61 and 62 are cleaned.

[0049] Thereafter, it is determined whether the harvesting device 7 and the threshing device are operating (on) (step S2). If they are in a non-operating state (off) where the harvesting device 7 and the threshing device are not operating (NO in step S2), the drive control of the moisture sensor 32 does not proceed until the harvesting device 7 and the threshing device start operating.

[0050] When it is determined that the harvesting device 7 and the threshing device are operating (YES in step S2), the electrode rollers 61 and 62 are reversed for the normal time. As a result, the moisture sensor 32 performs a cleaning operation for the normal time.

[0051] When the normal time has elapsed since the start of the cleaning operation, the electrode rollers 61 and 62 are rotated forward for a predetermined time (step S4). The predetermined time is set to the time required for the guide member 65 disposed at the upper left front position of the electrode rollers 61 and 62 to move to the upper front position of the electrode rollers 61 and 62. Therefore, when the electrode rollers 61 and 62 are rotated forward for the predetermined time, the guide member 65 moves from the upper left front position of the electrode rollers 61 and 62 to the upper front position of the electrode rollers 61 and 62.

[0052] Thereafter, it is determined whether the detection signal of the straw sensor 73 is at the on level (step S5). While the detection signal of the straw sensor 73 is at the off level (NO in step S5), the drive control of the moisture sensor 32 does not proceed.

[0053] When the cereal straw enters the cutting device 7 and the detection signal of the cereal straw sensor 73 becomes the on level (YES in step S5), the electrical resistance value between the electrode rollers 61 and 62 is detected, and based on this electrical resistance value, the presence or absence of cereal grains (crops) on the electrode rollers 61 and 62 is determined (step S6). When cereal grains are present on the electrode rollers 61 and 62, even if the cereal grains are not crushed, the electrical resistance value between the electrode rollers 61 and 62 is different from the case where there are no cereal grains on the electrode rollers 61 and 62. Therefore, the presence or absence of cereal grains on the electrode rollers 61 and 62 can be determined from the electrical resistance value between the electrode rollers 61 and 62.

[0054] When there are no cereal grains on the electrode rollers 61 and 62 (NO in step S6), it is determined again whether the detection signal of the cereal straw sensor 73 is at the on level (step S5).

[0055] When cereal grains are on the electrode rollers 61 and 62 and it is determined that there are cereal grains on the electrode rollers 61 and 62 (YES in step S6), the electrode rollers 61 and 62 are rotated forward, and the electrical resistance value between the electrode rollers 61 and 62 when the cereal grains are crushed by the electrode rollers 61 and 62 is detected, and the value of the moisture content contained in the cereal grains is obtained from this electrical resistance value. That is, the moisture sensor 32 performs a detection operation of detecting the electrical resistance value between the electrode rollers 61 and 62 when the cereal grains are crushed in order to measure the moisture content contained in the cereal grains.

[0056] When the moisture content of the cereal grains is measured, the electrode rollers 61 and 62 are rotated reversely over a normal time (step S8). Thereby, the moisture sensor 32 performs a cleaning operation over a normal time.

[0057] After the cleaning operation of the moisture sensor 32 is completed, it is determined again whether the cutting device 7 and the threshing device are operating (on) (step S2). If the cutting device 7 and the threshing device are in an operating state (YES in step S2), the processes after step S3 described above are executed. Thereby, in the state where the cutting device 7 and the threshing device are operating, the moisture content of the cereal grains is measured periodically.

[0058] <Measured Value Correction Process> FIG. 8 is a flowchart showing the flow of the measured value correction process.

[0059] During the operation of the harvesting device 7 and the threshing device by the control device 71, the moisture content contained in the grains is periodically and repeatedly measured. When the harvesting device 7 and the threshing device stop, for example, the average of the moisture content values measured during their operation is obtained, and the average value is displayed on the monitor 74.

[0060] In addition, the grains carried out from the grain tank 5 by the unloader 8 are transported to a dryer for drying. The dryer is equipped with a moisture sensor for measuring the moisture content of the grains. When the grains are loaded into the dryer, the moisture content contained in the grains is measured. The value of the moisture content of the grains measured by the dryer is displayed on a monitor provided in the dryer.

[0061] Therefore, the user can know the moisture content of the grains during harvesting by looking at the display on the monitor 74, and can know the moisture content of the grains to be dried in the dryer by looking at the display on the monitor of the dryer. However, due to factors such as differences in sensor sensitivity, for the same grains, the measured value of the moisture content by the combine 1 and the measured value of the moisture content by the dryer may deviate. In this case, there is a possibility that the user cannot trust those measurement results.

[0062] In addition, when the moisture content of the grains is managed in a grain management system including the combine 1 and the dryer, if the measured value of the moisture content by the combine 1 and the measured value of the moisture content by the dryer deviate for the same grains, the accurate moisture content contained in the grains cannot be managed.

[0063] Therefore, in the control device 71, by the measured value correction process, based on the measurement result of the moisture content of the grains input from an external device, the average value of the moisture content obtained after the harvesting device 7 and the threshing device stop is corrected.

[0064] Specifically, when an external measurement value, which is the value of the moisture content of the grain measured by an external device from the external device, is input to the control device 71 (YES in step S11), the control device 71 compares the external measurement value with the sensor measurement value, which is the average value of the moisture content obtained after the harvesting device 7 and the threshing device stop. Then, when the external measurement value and the sensor measurement value deviate (YES in step S12), that is, when the external measurement value and the sensor measurement value differ by a certain value or more, in the control device 71, the external measurement value is set as the reference value, and the sensor measurement value is corrected so that the deviation between the sensor measurement value and the external measurement value becomes smaller. For example, the sensor measurement value is corrected to the same value as the external measurement value (step S13). Then, the corrected sensor measurement value is displayed on the monitor 74 by the control device 71 (the sensor measurement value displayed on the monitor 74 is updated to the same value as the external measurement value).

[0065] <Operational effects> As described above, the sensor measurement value is corrected so that the sensor measurement value matches the external measurement value with the external measurement value as the reference value. As a result, since the sensor measurement value displayed on the monitor 74 matches the external measurement value, the sensor measurement value and the external measurement value can be made reliable for the user. Also, in the grain management system, the accurate moisture content contained in the grain can be managed.

[0066] Therefore, in the measurement value correction process, the sensor measurement value can be corrected well.

[0067] <Modification example> As described above, one embodiment of the present invention has been described, but the present invention can also be implemented in other forms.

[0068] For example, instead of the measurement value correction process shown in FIG. 8, the measurement value correction process shown in FIG. 9 may be performed.

[0069] In the measurement value correction process shown in FIG. 9, when an external measurement value is input from an external device to the control device 71 (YES in step S21), the control device 71 compares the external measurement value with the sensor measurement value, which is the average value of the moisture content obtained after the cutting device 7 and the threshing device stop. When the external measurement value and the sensor measurement value deviate (YES in step S22), that is, when the external measurement value and the sensor measurement value differ by a certain value or more, in the control device 71, the external measurement value is set as the reference value, and a correction value is obtained so as to reduce the deviation between the sensor measurement value and the external measurement value. For example, when correcting so that the sensor measurement value matches the external measurement value. Then, the obtained correction value is displayed on the monitor 74 as correction information by the control device 71 (step S23). In addition, a button for instructing the correction of the sensor measurement value is displayed on the monitor 74. When the correction of the sensor measurement value is instructed by pressing this button (YES in step S24), the sensor measurement value is corrected by the control device 71 using the correction value (step S25). When the sensor measurement value is corrected, the corrected sensor measurement value is displayed on the monitor 74.

[0070] In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

Explanation of Signs

[0071] 1: Combine 32: Moisture sensor 71: Control device 74: Monitor

Claims

A combine harvester for harvesting grain by cutting grain straws planted in a field and threshing the cut grain straws, comprising: a moisture sensor for measuring the moisture content of the grain; a control device configured to use the moisture sensor to obtain a sensor measurement value which is the value of the moisture content of the measured grain as the grain to be harvested, and when an external measurement value which is the value of the moisture content of the measured grain measured externally from an external device is input, compare the sensor measurement value with the reference value using the external measurement value as the reference value, generate correction information for correcting the sensor measurement value so that the deviation between the sensor measurement value and the reference value becomes small, and correct the sensor measurement value of the measured grain using the correction information.

2. further comprising a monitor for displaying information, wherein the control device causes the monitor to display the sensor measurement value measured using the moisture sensor, corrects the sensor measurement value displayed on the monitor using the correction information, and causes the monitor to display the corrected sensor measurement value. The combine harvester according to claim 1.

3. further comprising a monitor for displaying information, wherein the control device causes the monitor to display the correction information. The combine harvester according to claim 1.

4. The control device causes the monitor to display a button for instructing correction of the sensor measurement value, and when correction of the sensor measurement value is instructed by pressing the button, corrects the sensor measurement value using the correction information. The combine harvester according to claim 3.

5. In the control device, a value of the moisture content of the grain measured by a dryer for drying the grain is input as the external measurement value. The combine harvester according to any one of claims 1 to 4.

6. In the control device, the external measurement value is input by network communication from a terminal or a server. The combine harvester according to any one of claims 1 to 4.

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