JP2021065163A - Agricultural work vehicle - Google Patents

Abstract

To execute excellent work even in a case where the type of crop that is easily damaged is a harvest object, or in a case where a hydraulic actuator is provided.SOLUTION: A speed control unit 64 for controlling a speed of an engine 4 executes normal control for controlling an operation of a speed governor 63 so that the speed of the engine 4 reaches a target speed in a first control mode, executes normal control if a predetermined condition is established in a second control mode, and, if the predetermined condition is not established, executes idling control for controlling an operation of the speed governor 63 so that the speed of the engine 4 reaches an idling speed. The predetermined condition includes a condition that hydraulic actuators 30 and 34 are being operated.SELECTED DRAWING: Figure 7

Description

The present invention relates to an agricultural work vehicle equipped with an engine and various devices driven by the power of the engine.

In the combine, which is an example of an agricultural work vehicle, there has been one having the following configuration in the past. It is equipped with an engine rotation control unit that can change and adjust the engine rotation and a mode switch that switches the control mode. If the mode switch is off, the engine rotation speed is adjusted to the rotation speed set by the accelerator setting dial. Will be done. Then, when the mode switch is on, the engine is idling in the non-working state, and when the vehicle body running state or the work clutch for cutting work is engaged, the rotation control of the engine is performed so that the engine operates in a rated manner. (See, for example, Patent Document 1). In the one shown in Patent Document 1, various devices mounted on the airframe are mechanically driven by the power from the engine.

Japanese Unexamined Patent Publication No. 2012-90606

In the above-mentioned conventional configuration, wasteful consumption of fuel is suppressed by idling in the non-working state, and the engine is rated to operate during the harvesting work. That is, since the engine operates in a high rotation state close to the maximum output, it is possible to efficiently perform harvesting work for crops such as rice, for example.

In addition to rice, the crops to be harvested include various crops such as soybean, buckwheat, and corn. Depending on the type of crop, running the engine at rated operation may damage the crop.

Agricultural work vehicles are provided with a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor as a device operated by the power of an engine, and may be configured to move an object to be operated by such a hydraulic actuator. When operating such a hydraulic actuator, if the engine is in rated operation, the operation of the hydraulic actuator may be too fast, and if it is idling operation, the operation of the hydraulic actuator may be too slow.

Therefore, it is possible to suppress wasteful consumption of fuel and to perform harvesting work efficiently, but it is also good when harvesting fragile types of crops or when providing a hydraulic actuator. It was requested to be able to perform various tasks.

The characteristic configuration of the agricultural work vehicle according to the present invention is to command an engine, a speed control device for adjusting the rotation speed of the engine, a rotation speed control unit for controlling the rotation speed of the engine, and a target rotation speed of the engine. It is provided with a target rotation speed setting means, a mode switching means capable of switching the control mode of the rotation speed control unit between the first control mode and the second control mode, and a hydraulic actuator that can be operated based on the power of the engine. In the first control mode, the rotation speed control unit executes normal control for controlling the operation of the speed control device so that the rotation speed of the engine becomes the target rotation speed, and the second control In the mode, if the predetermined condition is satisfied, the normal control is executed, and if the predetermined condition is not satisfied, the speed control device is operated so that the engine speed becomes the idling speed. It is configured to execute idling control for controlling the operation, and the predetermined condition includes a condition that the hydraulic actuator is operating.

According to the present invention, if a condition of operating various devices associated with the harvesting work is set as a predetermined condition, if the second control mode is switched to during the harvesting work, a non-working state, that is, running When the engine is stopped and no harvesting work is being performed, the engine speed becomes the idling speed. As a result, wasteful fuel consumption can be suppressed.

At the time of harvesting work, the speed governor is controlled so that a predetermined condition is satisfied and the engine speed reaches the target speed. At this time, since the target rotation speed is manually set by the target rotation speed setting means, it can be set to a rotation speed suitable for the work at that time. When a fragile type of crop is to be harvested, the appropriate number of revolutions is set. As a result, it becomes possible to carry out the harvesting work efficiently. When traveling on the road or on the ridge, the road traveling can be performed satisfactorily by switching to the first control mode and setting the target rotation speed to a rotation speed suitable for traveling, for example, the maximum rotation speed.

A hydraulic actuator that is operated by the power of the engine is provided, and when the hydraulic actuator is operating, a predetermined condition is satisfied, so that the engine is driven at an appropriate engine rotation speed set by the target rotation speed setting means. , The operation by the hydraulic actuator is performed in an appropriate state.

Therefore, while suppressing wasteful consumption of fuel and efficiently performing harvesting work, good work is performed even when a fragile type of crop is targeted for harvesting or when a hydraulic actuator is provided. It became possible to be able to do.

In the present invention, a storage device capable of switching between an action posture capable of storing crops and a discharge posture capable of discharging the stored crops to the outside is provided, and the hydraulic actuator acts on the storage device. It is preferable that the posture can be switched between the posture and the discharge posture.

According to this configuration, the hydraulic actuator changes the posture of the storage device to discharge the stored crops to the outside. When the hydraulic actuator operates, a predetermined condition is satisfied and the engine is driven at an appropriate engine speed set by the target rotation speed setting means, so that the operation by the hydraulic actuator is performed in an appropriate state.

In the present invention, when the rotation speed control unit switches from the state in which the predetermined condition is not satisfied to the state in which the predetermined condition is satisfied in the second control mode, the first set time starts from the switching time. After that, when the normal control is executed and the state in which the predetermined condition is satisfied is switched to the state in which the predetermined condition is not satisfied, the first set time starts from the switching time. It is preferable that the idling control is executed after a long second setting time has elapsed.

According to this configuration, idling control is executed when the predetermined condition is not satisfied, and when the predetermined condition is satisfied from this state, the rotation speed control unit waits after a short first setting time has elapsed. , The speed control device is controlled so that the engine speed changes from the idling speed to the target set speed.

When the state in which the predetermined condition is satisfied is switched to the state in which the predetermined condition is not satisfied, the engine speed control unit idles the engine speed from the target set speed after a long second set time has elapsed. The speed control device is controlled so as to reach the number of revolutions.

When the engine speed increases, it can respond as quickly as possible to prepare for subsequent work. On the other hand, when the engine speed decreases, it is possible to wait for a longer time to avoid determining that the predetermined condition is not satisfied due to an erroneous operation.

In the present invention, as the hydraulic actuator, the hydraulic actuator for automatic operation that automatically moves and operates the operation target up to the target operation position based on the operation command, and the operation only while the manual operation command is commanded. A hydraulic actuator for manual operation for moving the target is provided, and the rotation speed control unit is the first set time when the operation of the hydraulic actuator for manual operation switches to a state in which the predetermined condition is satisfied. And, the first set time when switching to the state where the predetermined condition is satisfied by the operation of the hydraulic actuator for automatic operation is set to the same time, and the operation of the hydraulic actuator for manual operation is completed. The second set time when switching to the state where the predetermined condition is not satisfied is the first when the operation of the hydraulic actuator for automatic operation is completed and the state is switched to the state where the predetermined condition is not satisfied. (Ii) It is preferable to set the time longer than the set time.

According to this configuration, the first set time, which is the waiting time from switching to the state where the predetermined condition is satisfied to executing the normal control, is the case of the hydraulic actuator for manual operation and the case of the hydraulic actuator for automatic operation. In any of the cases, the same time is set, and when the engine speed increases, it is possible to respond as quickly as possible and prepare for the subsequent work.

As the second set time, which is the waiting time from switching from the state where the predetermined condition is satisfied to the state where the predetermined condition is not satisfied to executing the idling control, the case of the hydraulic actuator for manual operation is automatic. A longer time is set than in the case of a hydraulic actuator for operation.

When the hydraulic actuator is operated by manual operation, the command operation may be repeated every short time. Therefore, the waiting time (second set time) is lengthened to avoid switching of the control state due to erroneous operation. Can be made to.

In the present invention, a speed change operating tool capable of manually changing the vehicle body traveling speed and a neutral detection sensor for detecting a neutral state in which the speed change operating tool is in a running neutral position are provided, and the above-mentioned predetermined conditions are met. It is preferable that the neutral detection sensor does not detect the neutral state.

According to this configuration, if the speed change operation tool is not in the traveling neutral state, the vehicle body is in the traveling state, so that a traveling load is applied to the engine. Therefore, smooth running drive can be performed by executing normal control and rotating the engine at a target rotation speed.

In the present invention, a work clutch for turning on and off power transmission to a work device mounted on the machine body is provided, and the predetermined conditions include the state in which the work clutch is engaged. In the second control mode, the neutral state is detected by the neutral detection sensor for the first set time when the work clutch is switched to the engaged state to switch to the state in which the predetermined condition is satisfied. It is preferable to set the time longer than the first set time when switching to the state in which the predetermined condition is satisfied.

According to this configuration, the first set time, which is the waiting time when the speed change operating tool deviates from the running neutral state and switches to the vehicle body running state, is set to a shorter time. When the speed change operation tool is operated, it may be operated quickly by manual operation, so that the engine speed can be increased as soon as possible.

On the other hand, when the work clutch is switched to the engaged state, if the engine speed is increased at the same time as the work clutch is engaged and the work device is started to be driven, the load on the engine may become excessive. Therefore, by setting the first set time, which is the waiting time, to a longer time, the engine is initially driven at a low speed, and then the engine speed is increased after a while, resulting in an excessive load as described above. Can be avoided.

In the present invention, a work clutch for turning on and off power transmission to a work device provided in the machine body is provided, and the predetermined conditions include the state in which the work clutch is engaged. In the second control mode, the first set time when the work clutch is switched to the engaged state to switch to the state in which the predetermined condition is satisfied is changed to the predetermined condition by switching the work clutch to the disengaged state. It is preferable to set the time longer than the first set time when switching to the state in which is not established.

According to this configuration, when the work clutch is switched to the disengaged state, there is no possibility that an excessive load will be generated as when the work device is started, so the first set time, which is the waiting time, is set to a shorter time. Will be done. As a result, the engine speed can be reduced to the idling speed as soon as possible.

In the present invention, it is preferable that an alarm means for activating an alarm is provided when the engine speed falls below a lower limit value set to a value lower than a reference speed corresponding to a no-load state by a predetermined amount. is there.

According to this configuration, when the work is performed while the vehicle body is running, the drive load on the engine increases, and the engine speed decreases from the speed in the no-load state accordingly. The amount of decrease in engine speed corresponds to the magnitude of the load applied to the engine.

Therefore, if the engine speed falls below the lower limit set to a value lower than the reference speed corresponding to the no-load state by a predetermined amount, the load on the engine may be excessive, so an alarm means is used. The alarm is activated. This can encourage the driver to take measures.

It is an overall side view of a combine. It is the whole plan view of the combine. It is a rear view which shows the elevating state of a grain tank. It is a side view of the operation panel. It is a top view of the operation panel. It is a top view of the engine information display operation part. It is a control block diagram. It is a flowchart of a control operation. It is a flowchart of a control operation. It is a flowchart of a control operation. It is a flowchart of a control operation.

Embodiments of the present invention will be described with reference to the drawings. In the following description, the direction of the arrow "F" is the "front side of the aircraft" (see FIGS. 1 and 2), the direction of the arrow "B" is the "rear side of the aircraft" (see FIGS. 1 and 2), and the arrow " The direction of "L" is defined as "the left side of the aircraft" (see FIG. 2), and the direction of the arrow "R" is defined as "the right side of the aircraft" (see FIG. 2).

(Overall composition of the combine)
1 and 2 show an example of a harvester, a normal combine. This combine includes a traveling machine body 1 equipped with a pair of left and right front wheels 2 and a pair of left and right rear wheels 3 as traveling devices. In other words, this combine is a wheel-type combine. The front wheels 2 are configured to be driveable by power from the engine 4. The power of the engine 4 is converted into forward power and reverse power by the main transmission 5 composed of a hydrostatic continuously variable transmission (HST), and the rotation speeds of the forward power and the reverse power are steplessly changed forward. It is transmitted to the wheel 2. The rear wheel 3 is configured to be steerable. Although not shown, various devices related to the engine 4, such as a radiator and an air cleaner, are provided in the vicinity of the engine 4. Further, an exhaust gas treatment device 6 for purifying the exhaust gas of the engine 4 is provided above the engine 4.

The exhaust gas treatment device 6 includes a DPF (Diesel Particulate Filter) having a well-known structure that collects and removes PM (Particulate Matter) contained in the exhaust gas. The exhaust gas treatment device 6 is configured to be switchable between an automatic mode in which a regeneration process for automatically burning and removing the collected particulate matter is performed and a prohibition mode in which the regeneration process is prohibited. If the engine 4 operates in the state of switching to the prohibition mode and the particulate matter continues to be collected, clogging will occur. Therefore, it is necessary to manually execute the regeneration process on a regular basis.

A driving unit 7 is provided at the front portion of the traveling machine body 1. The driving unit 7 is covered by the cabin 8. The driver unit 7 is provided with a driver's seat 9 and a steering wheel 10 in front of the driver's seat 9. By rotating the steering wheel 10, the rear wheel 3 is steered by the power steering device (not shown).

A cutting transport unit 12 is provided at the front portion of the machine frame 11. The harvesting and transporting unit 12 has a harvesting unit 13 for cutting the planted grain culms and a feeder 14 for transporting the harvested harvested culms toward the rear. The cutting section 13 is supported by the machine body so as to be able to move up and down, and the cutting section 13 is provided with a reel 15, a cutting blade 16, and an auger 17. The feeder 14 is supported by the airframe so as to swing up and down around the horizontal axis at the rear end.

The entire cutting transport unit 12 including the feeder 14 and the cutting unit 13 is configured to be swingable and liftable by the lifting hydraulic cylinder 18. The cutting unit 13 moves up and down in a descending work state in which the cutting transport unit 12 is swung up and down by the hydraulic cylinder 18 and descends near the ground, and in a non-working state in which the cutting and transporting unit 12 rises to a higher position from the ground. Be manipulated. A cutting elevating sensor 19 (see FIG. 7) capable of detecting the elevating height of the cutting unit 13 based on the relative angle of the feeder 14 with respect to the machine body is provided. The cutting and lowering sensor 19 makes it possible to determine the lowering working state of the cutting and transporting unit 12 and the ascending and non-raising and non-working state of the cutting and transporting unit 12.

The planted culm in the field is scraped into the rear part of the cutting section 13 by the reel 15 and cut by the cutting blade 16 having a clipper-shaped cutting blade. The cut grain culms after cutting by the cutting blade 16 are gathered by the auger 17 at the position of the entrance in the feeder 14 and sent to the feeder 14.

The rear part of the traveling machine 1 is provided with a threshing device 20 as a working device for threshing the harvested culms transported by the feeder 14. The feeder 14 is connected to the front portion of the threshing device 20 so as to be vertically swingable around the horizontal axis. All the cut culms after cutting are conveyed from the cutting section 13 to the threshing device 20 via the feeder 14. As shown in FIGS. 2 and 3, the threshing device 20 is mounted on the machine frame 11 in a state of being biased to the left lateral side of the traveling machine 1 with respect to the center in the lateral width direction of the traveling machine 1, and is mounted on the machine frame 11. It is supported in a fixed state. A grain tank 21 for storing grains obtained by the threshing process is provided above the threshing device 20.

(Grain discharge device)
A grain discharging device 22 for discharging the grains stored in the grain tank 21 to the outside of the machine body is provided. A discharge screw 23 extending in the front-rear direction is provided at the bottom of the grain tank 21, and a grain discharge device 22 capable of transporting grains to the outside of the machine body is connected to the front of the discharge screw 23 via a connection case 24. There is. The grain discharge device 22 is a screw conveyor type vertical transport section 25 that transports grains upward from the terminal portion of the discharge screw 23, and a screw conveyor type that transports grains laterally from the upper end portion of the vertical transport section 25. The lateral transport unit 26 and the like are provided.

The grain discharge device 22 is driven by the power of a hydraulic motor 27 for discharge. The operation of the discharge hydraulic motor 27 is controlled by the control device 28, and the on / off control is controlled based on the operation of the discharge command switch 29 (see FIG. 7) provided in the operation unit 7.

The grain discharge device 22 has a retracted posture (a posture shown by a solid line in FIG. 2) and a discharge posture (a posture shown by a solid line in FIG. 2) with the rotation axis Y of the vertically oriented vertical transport portion 25 as the center of rotation by the expansion and contraction operation of the swivel hydraulic cylinder 30. The turning operation is possible over the posture shown by the virtual line in FIG. A turning angle sensor 31 (see FIG. 7) capable of detecting the turning angle is provided near the turning center of the grain discharging device 22.

The turning operation by the turning hydraulic cylinder 30 is automatically performed by the control device 28 based on the command operation of the turning command switch 32 (see FIG. 7) provided in the operation unit 7. That is, when the swivel command switch 32 is turned on, the swivel hydraulic cylinder 30 is operated from the retracted posture to the discharge posture based on the detection result of the swivel angle sensor 31. After that, when the turning command switch 32 is turned on again, the turning operation is automatically performed from the discharging posture to the retracting posture in the same manner. Therefore, the swivel hydraulic cylinder 30 corresponds to the automatic operation hydraulic actuator.

In the grain tank 21, in addition to the grain discharge form by the grain discharge device 22, the entire grain tank 21 is swung around the rotation axis of the discharge screw 23 and stored directly from the right side portion. It is configured so that the existing grains can be discharged to the outside.

As shown in FIG. 3, the tank frame body 33 is erected around the grain tank 21 in the machine body frame 11. The tank frame body 33 is connected to the grain tank 21. The grain tank 21 is supported by the tank frame body 33 so as to be able to swing up and down with the horizontal axis P of the discharge screw 23 extending in the front-rear direction of the vehicle body as the swing center. A tank elevating hydraulic cylinder 34 is connected to the tank frame body 33 and the lower part of the grain tank 21. The grain tank 21 has a descending position (see FIGS. 1 and 2) that creates a descending posture and an ascending position (see FIG. 3) that creates a descending posture with the horizontal axis P as the swinging axis by the tank elevating hydraulic cylinder 34. And swings up and down. When it swings to the ascending position, the side wall located on the lower side is opened and the stored grains can be discharged to the lateral side and the outer side.

The swinging / raising / lowering operation of the grain tank 21 is performed by the control device 28 based on the command operation of the tank raising switch 35 and the tank lowering switch 36 (see FIG. 7) provided in the operation unit 7. When the tank rise switch 35 is operated, the grain tank 21 rises and swings only while it is being operated. When the tank lowering switch 36 is operated, the grain tank 21 descends and swings only while it is being operated. Therefore, the tank elevating hydraulic cylinder 34 corresponds to the manual operation hydraulic actuator.

(Driving part)
As shown in FIG. 2, the driver unit 7 is provided with an operation panel unit 38 located on the side side of the driver's seat 9. As shown in FIGS. 4 and 5, the operation panel unit 38 can be engaged with the main speed change lever 39 for shifting the main speed changer 5 and the grain removal clutch 40 which is an example of a work clutch for turning on / off the power transmission to the grain removal device 20. Displaying information about the dehulling clutch lever 41, the cutting clutch lever 42 that can turn on and off the cutting clutch (not shown) that turns on and off the power transmission to the cutting section 13, and the engine 4, and the engine information display that performs operations related to that information. An operation unit 43 and the like are provided.

The main transmission lever 39 can be oscillated in the front-rear direction, and the more the main transmission lever 39 is oscillated from the neutral position to the front side, the more the traveling speed is steplessly increased while the main transmission 5 is traveling forward. As the main transmission lever 39 swings rearward from the neutral position, the traveling speed is steplessly increased while the main transmission 5 is in the reverse traveling state. The threshing clutch lever 41 and the cutting clutch lever 42 can be swung in the front-rear direction, and are configured to be engaged in the clutch by operating the front side.

In the vicinity of the main shift lever 39, there are a neutral detection sensor 46 that detects that the main shift lever 39 is in the neutral position, and a reverse detection sensor 47 that detects that the main shift lever 39 is being operated in the reverse state. It is equipped. Further, in the vicinity of the threshing clutch lever 41, a threshing sensor 48 for detecting that the threshing clutch lever 41 is engaged in the clutch operation is provided.

The engine information display operation unit 43 will be described.
As shown in FIG. 6, in the front part of the engine information display operation unit 43, a rotation speed setting device 49 as a target rotation speed setting means for setting the target rotation speed of the engine 4 and an output rotation speed of the engine 4 rotate. The automatic on / off switch 50 that commands the on / off of the rotation speed control that automatically adjusts to the target rotation speed set by the number setting device 49, and turns on when the rotation speed control is turned on and off, and turns off when the rotation speed control is turned off. An on / off indicator lamp 51 is provided. The rotation speed control will be described later.

An artificial operation unit 52 in which an artificial operation related to the exhaust gas treatment device 6 is performed is located in the front and rear intermediate portions of the engine information display operation unit 43, and a state in which the state of the exhaust gas treatment device 6 is indicated by being located adjacent to the artificial operation unit 52. A display unit 53 is provided. The artificial operation unit 52 includes a prohibition switch 54 for switching the exhaust gas treatment device 6 to the prohibition mode, and a regeneration switch 55 for forcibly executing the regeneration process. The prohibition switch 54 is provided with a prohibition state indicator lamp 56 that lights up when the exhaust gas treatment device 6 is switched to the prohibition mode and turns off when the prohibition mode is canceled. The reproduction switch 55 is provided with a reproduction state display lamp 57 that lights up when the execution of the reproduction process is instructed and turns off when the execution of the reproduction process is not instructed.

The state display unit 53 is provided with an operation status display lamp 58 that lights up when the exhaust gas treatment device 6 is executing the regeneration process and turns off when the exhaust gas treatment device 6 is not executing the regeneration process. The exhaust gas treatment device 6 is in the automatic mode in the initial setting state, and is always set to the automatic mode when the prohibition switch 54 is not operated.

At the rear of the engine information display operation unit 43, there is a first abnormality display unit 59 that displays an abnormality (system abnormality) of each part around the engine for operating the engine 4, and among the abnormalities of each part around the engine, other than the system abnormality. A second abnormality display unit 60 for displaying an abnormality and a fuel abnormality display unit 61 for displaying an abnormality state in which water has entered the fuel supplied to the engine 4 are provided.

(Engine speed control)
Next, the rotation control of the engine 4 will be described.
As shown in FIG. 7, an engine rotation sensor 62 for detecting the rotation speed of the engine 4 and a speed control device 63 for adjusting the rotation speed of the engine 4 are provided, and the operation of the speed control device 63 is controlled by the control device 28. It is configured to be controlled by. Therefore, the control device 28 is provided with a rotation speed control unit 64 that controls the rotation speed of the engine 4.

A mode switch 65 is provided as a mode switching means capable of switching the control mode of the rotation speed control unit 64 between the first control mode and the second control mode. In the first control mode, the rotation speed control unit 64 executes normal control for controlling the operation of the speed governor 63 so that the rotation speed of the engine 4 becomes the target rotation speed set by the rotation speed setting device 49. To do. In the second control mode, if the predetermined condition is satisfied, the normal control is executed, and if the predetermined condition is not satisfied, the speed governor 63 so that the rotation speed of the engine 4 becomes the idling rotation speed. It is configured to perform idling control to control the operation of. Then, the predetermined condition includes a condition that either the swivel hydraulic cylinder 30 or the tank elevating hydraulic cylinder 34 is operating.

A specific control operation will be described based on the control flowchart of the rotation speed control unit 64 shown in FIGS. 8, 9 and 10. It is a prerequisite for the operation of the rotation speed control unit 64 that the automatic on / off switch 50 is turned on and operated.

When the first control mode is set by the mode switch 65, the normal control is executed regardless of various conditions as described later (steps 1 and 7). When the second control mode is set, the running neutral condition that the main speed change lever 39 is operated other than the neutral position, the threshing work condition that the threshing clutch lever 41 is in the engaged state, and the grain discharging device 22 discharge. At least one of the discharge work condition that the grain discharge device 22 is operating, the swivel operation condition that the grain discharge device 22 is swirling, and the tank elevating operation condition that the grain tank 21 is being lifted and lowered is satisfied. If so, the normal control is executed, and if none of the conditions are satisfied, the idling control is executed (steps 1 to 6 and 8).

The running neutral condition is detected by the neutral detection sensor 46, the threshing work condition is detected by the threshing sensor 48, the discharge work condition is detected by the operating state of the discharge command switch 29, and the turning operation condition is the turning command switch 32. It is detected in the operating state, and the tank raising / lowering operation condition is detected in the operating state of the tank raising switch 35 and the tank lowering switch 36.

The normal control executes the control shown in FIG.
In normal control, the engine speed is adjusted so that the engine speed becomes the target speed when the condition is satisfied from the state where the condition is not satisfied. At that time, the engine speed is changed and adjusted from the time when the condition is satisfied. The waiting time (an example of the first set time) until is different depending on the difference in the conditions to be satisfied.

That is, the waiting time is zero under the running neutral condition, the first waiting time (T1) is set under the threshing work condition, the second waiting time (T2) is set as the waiting time under the discharging work condition, and the turning operation condition. The third standby time (T3) is set, and the fourth standby time (T4) is set under the tank elevating operation condition. That is, when the running neutral condition is satisfied, the engine speed is adjusted to the target speed without any time delay (steps 11 and 20). When the threshing work condition is satisfied, the engine speed is adjusted to the target speed after the first standby time (T1) has elapsed (steps 12 and 13). Hereinafter, similarly, the engine speed is adjusted to the target speed after the set waiting time has elapsed (steps 14 to 19).

The waiting time under the threshing work condition, that is, the second waiting time (T2) is set longer than the waiting time (zero) under the running neutral condition. Further, the same time is set for the third standby time (T3) and the fourth standby time (T4). The third standby time (T3) corresponds to the first set time when the condition is switched to the state where the condition is satisfied by the operation of the tank elevating hydraulic cylinder 34. The fourth standby time (T4) corresponds to the first set time when the condition is switched to the state where the condition is satisfied by the operation of the turning hydraulic cylinder 30.

The idling control executes the control shown in FIG.
In idling control, the engine speed is adjusted so that the engine speed becomes the idling speed when none of the conditions are satisfied from the condition satisfied, but at that time, when the condition is not satisfied. The waiting time (an example of the second set time) from the time until the engine speed is changed and adjusted differs depending on the conditions that are satisfied.

That is, the fifth waiting time (T5) is set as the waiting time under the running neutral condition, the sixth waiting time (T6) is set as the waiting time under the discharging work condition, and the seventh waiting time (T7) is set as the threshing work condition. The eighth standby time (T8) is set under the turning operation condition, and the ninth standby time (T9) is set under the tank elevating operation condition. Similar to the normal control, the engine speed is adjusted to the idling speed after the set waiting time elapses after each condition is satisfied (steps 21 to 31).

The ninth waiting time (T9) is set to be longer than the eighth waiting time (T8). The fifth standby time (T5) is set in the running neutral condition, and this fifth waiting time (T5) is the waiting time (T5) from the time when the running neutral condition is satisfied until the engine speed is changed and adjusted. Zero) A longer time is set.

The first standby time (T1) in the normal control is set to be longer than the sixth standby time (T6) in the idling control. The first standby time (T1) corresponds to the waiting time (first set time) when the threshing clutch 40 is switched to the engaged state to switch to the state in which the predetermined condition is satisfied. The sixth standby time (T6) corresponds to the waiting time (second set time) when the threshing clutch 40 is switched to the disengaged state and the predetermined condition is not satisfied.

Next, engine load control will be described with reference to FIG.
The condition that the degraining clutch lever 41 is in the engaged state, the condition that the main speed change lever 39 is neither in the neutral position nor in the reverse position, and the elevating height of the cutting unit 13 is equal to or less than the set height (cutting work state). If all the conditions that there is, and if the reference speed is set in advance, and the condition that the engine speed is equal to or less than the reference speed are all satisfied, the engine speed at that time is used as the reference speed. Set (steps 41 to 46). That is, the no-load rotation speed at which the cutting operation is started while the machine is traveling forward is set as the reference rotation speed.

After that, when the cutting operation is executed, if the engine speed becomes equal to or less than the lower limit set to a value lower than the reference speed by a predetermined amount, the engine 4 is assumed to be overloaded, and the operation unit 7 is prepared. The alarm device 66 as the alarm means is activated (steps 47 and 48).

The alarm device 66 includes a buzzer (not shown) and an indicator lamp provided on the operation panel unit 38, and notifies the driver that the engine 4 is overloaded by sounding the buzzer and turning on the indicator lamp. ..

[Another Embodiment]
(1) In the above embodiment, in the normal control, the waiting time (second waiting time) under the threshing work condition is set longer than the waiting time (zero) under the running neutral condition. Each of the above-mentioned waiting times may be set to the same time.

(2) In the above embodiment, in the normal control, the third standby time (T3) and the fourth standby time (T4) are set to the same time, but they may be set to different times. In that case, the third standby time (T3) may be set longer than the fourth standby time (T4), and the third standby time (T3) may be set shorter than the fourth standby time (T4).

(3) In the above embodiment, in the idling control, the ninth standby time (T9) is set to be longer than the eighth standby time (T8), but they may be set to the same time. A time in which the 9 waiting time (T9) is shorter than the 8th waiting time (T8) may be set.

(4) In the above embodiment, as the hydraulic actuator, a swivel hydraulic cylinder 30 for swiveling and driving the grain discharge device 22 and a tank elevating hydraulic cylinder 34 for raising and lowering the grain tank 21 are provided. Instead, it may be a hydraulic cylinder that operates another device, a hydraulic motor, or the like.

The present invention can be applied to agricultural work vehicles such as combines, rice transplanters, tractors, etc., which are equipped with an engine and various devices driven by the power of the engine.

4 engine 20 threshing device (working device)
21 Grain tank (storage device)
30,34 Hydraulic cylinder (hydraulic actuator)
40 Threshing clutch (work clutch)
46 Neutral detection sensor 49 Rotation speed setter (target rotation speed setting means)
63 Speed governor 64 Rotation speed control unit 65 Mode switching means 66 Alarm device (alarm means)

Claims (8)

An engine, a speed control device for adjusting the rotation speed of the engine, a rotation speed control unit for controlling the rotation speed of the engine, a target rotation speed setting means for instructing the target rotation speed of the engine, and the rotation speed control. It is provided with a mode switching means capable of switching the control mode of the unit between the first control mode and the second control mode, and a hydraulic actuator that can be operated based on the power of the engine.
The rotation speed control unit
In the first control mode, normal control for controlling the operation of the speed governor is executed so that the rotation speed of the engine becomes the target rotation speed.
In the second control mode, if the predetermined condition is satisfied, the normal control is executed, and if the predetermined condition is not satisfied, the engine speed is set to the idling speed. It is configured to perform idling control that controls the operation of the governor,
An agricultural work vehicle in which the predetermined condition includes a condition that the hydraulic actuator is operating. It is equipped with a storage device that can switch between an action posture that can store crops and a discharge posture that discharges the stored crops to the outside.
The agricultural work vehicle according to claim 1, wherein the hydraulic actuator can switch the storage device between the working posture and the discharging posture. The rotation speed control unit is in the second control mode.
When the state in which the predetermined condition is not satisfied is switched to the state in which the predetermined condition is satisfied, the normal control is executed and the normal control is executed after the first set time has elapsed from the switching time.
When the state in which the predetermined condition is satisfied is switched to the state in which the predetermined condition is not satisfied, the idling control is performed after a second set time longer than the first set time has elapsed from the switching time. The agricultural work vehicle according to claim 1 or 2, which is configured to carry out. As the hydraulic actuator
A hydraulic actuator for automatic operation that automatically moves the operation target up to the target operation position based on the operation command, and a flood control for manual operation that moves the operation target only while the manual operation command is commanded. Equipped with an actuator
The rotation speed control unit
The first set time when the operation of the hydraulic actuator for manual operation switches to the state where the predetermined condition is satisfied, and when the operation of the hydraulic actuator for automatic operation switches to the state where the predetermined condition is satisfied. Set the same time as the first set time of
The second set time when the operation of the hydraulic actuator for manual operation is completed and the state is switched to the state in which the predetermined condition is not satisfied is set to the predetermined condition when the operation of the hydraulic actuator for automatic operation is completed. The agricultural work vehicle according to claim 3, wherein the time is set to be longer than the second set time when the state is switched to the state in which is not established. It is equipped with a speed change operating tool that can change the vehicle body running speed by manual operation and a neutral detection sensor that detects the neutral state in which the speed change operating tool is in the running neutral position.
The agricultural work vehicle according to claim 3 or 4, wherein the neutral state is detected by the neutral detection sensor under the predetermined conditions. It is equipped with a work clutch that turns on and off the power transmission to the work equipment mounted on the machine.
The predetermined condition includes that the work clutch is engaged.
The rotation speed control unit is in the second control mode.
The predetermined condition is satisfied by switching the first set time when the neutral state is detected by the neutral detection sensor to the state where the predetermined condition is satisfied, and the working clutch is switched to the engaged state. The agricultural work vehicle according to claim 5, which is set to a time longer than the first set time when the state is switched to the clutch state. It is equipped with a work clutch that turns on and off the power transmission to the work equipment provided on the machine.
The predetermined condition includes that the work clutch is engaged.
The rotation speed control unit is in the second control mode.
The first set time when the work clutch is switched to the engaged state to switch to the state where the predetermined condition is satisfied, and the state where the predetermined condition is not satisfied when the work clutch is switched to the disengaged state. The agricultural work vehicle according to any one of claims 3 to 6, which is set to a time longer than the first set time when switching to. Any one of claims 1 to 7 provided with an alarm means that activates an alarm when the engine speed falls below a lower limit value set to a value lower than a reference speed corresponding to a no-load state by a predetermined amount. Agricultural work vehicle described in item 1.

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