JP2000270664A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the trouble caused by unexpected increase in vehicle speed e.g. in a counter-reaping work while making the best use of the advantages of vehicle speed control. SOLUTION: The objective combine harvester is provided with a lifting hydraulic cylinder 5 for lifting or lowering a reaping part placed at the front part of the machine body by the transmission of artificial lifting or lowering command by a commanding means SR and a vehicle speed controlling means 100 to automatically accelerating or decelerating a traveling speed changer 10 to keep the load of engine E detected by a load-detecting means 101 to a target load level. The vehicle speed controlling means 100 inhibits the acceleration work of the traveling speed changer 10 independent of the detection information transmitted from the load detection means 101 unless a prescribed time is passed or the vehicle is traveled for a prescribed distance after the lifting or lowering motion of the reaping part according to the lifting or lowering command transmitted from the commanding means SR.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling transmission which is provided with a mowing portion at the front of the body so as to be capable of ascending and descending operation so that the engine load detected by load detecting means is maintained at a target load. The present invention relates to a combine provided with vehicle speed control means for automatically increasing and decreasing the speed.

[0002]

2. Description of the Related Art A combine having the above-described structure performs a work run at a high speed as much as possible by effectively utilizing the engine capacity while avoiding the occurrence of engine stalls by the above-described vehicle speed control. However, in such a combine, conventionally,
The raising and lowering operation of the reaping unit has been performed irrespective of the control operation of the vehicle speed control means.

[0003]

When performing a mowing operation,
For example, when the planted grain culm is lying down in the direction opposite to the harvesting work direction of the combine, that is, in a so-called head-cutting state, that is, the ear portion cuts the planted grain culm that has fallen toward the combine side. There is a case where a mowing operation is performed, but in such a mowing operation, the tip portion (weeding implement) of the mowing part is hidden below the lodging grain culm, and it is difficult for the operator to recognize the mowing height at that time. In such a case, in such a case, the pilot once raises the mowing section by a set amount, then lowers the mowing section until it touches the ground, and then raises the mowing section by a predetermined amount to secure the set mowing height. In some cases, the reaping operation is continued while doing so.

[0004] In the above-mentioned conventional configuration, in the above-described working mode, as described above, when the mowing part is raised and then lowered until it comes into contact with the ground, the amount of grain culm which is temporarily mowing and conveyed is reduced. As a result, the engine load is reduced due to the decrease in the mowing work load, and as a result, the vehicle speed control may temporarily increase the vehicle speed against the intention of the driver, and the steering posture may become unstable. There is a risk that the planted grain culm may be damaged or pulled out, making it difficult to perform the work.

The present invention has been made in view of such a point, and an object of the present invention is to avoid the inconvenience caused by an unexpected increase in the vehicle speed in, for example, a head-cutting operation while taking advantage of the vehicle speed control. The point is to do so.

[0006]

According to the characteristic configuration of the present invention, the vehicle speed control means determines whether a predetermined time has elapsed after the raising and lowering operation of the reaping unit has been performed or the vehicle body has been moved. Until the vehicle travels for a set distance, the speed increasing operation is not performed in the traveling speed change device, and the speed increasing operation is prohibited.

Therefore, if the raising and lowering operation of the reaping unit is performed while the reaping operation is being performed while the vehicle speed is being controlled by the vehicle speed control means, the set time elapses thereafter or the vehicle body travels for the set distance. Until the operation is performed, the speed increase is prohibited. For example, the grain stem is lying down,
In the case where the harvesting operation is performed in a head-cutting state, the engine load may be reduced by the raising / lowering operation of the cutting unit as described above, and in the case of the conventional control mode, the vehicle speed control means may reduce the engine load to an appropriate load. However, if such a lifting operation is performed, the speed increasing is prohibited and the speed increasing operation is not performed. The disadvantage of speeding up can be avoided beforehand. Whether the set time has elapsed since the raising and lowering operation of the mowing unit was performed, or after the vehicle body has traveled the set distance, whether the planted grain culm is in a state close to an upright posture instead of the above-described lying state Or because the running state in the mowing work is considered to be stable,
There is no inconvenience even if the speed is increased.

As a result, while taking advantage of the vehicle speed control, for example, inadvertently increasing the vehicle speed in a head-cutting operation or the like, there is a possibility that the planted grain culm may be damaged or pulled out. It can be avoided beforehand.

According to a second aspect of the present invention, in the first aspect, the vehicle speed control means includes a state in which the vehicle speed control means is in the low speed state where the mowing operation is started until the vehicle speed reaches a set vehicle speed. Is configured to be released.

[0010] In a low-speed state in which the harvesting operation is started and the harvesting is started until the vehicle speed reaches the set vehicle speed, even if the grain stalk is not lying down, the operator moves up and down in order to adjust the height of the cutting section. In some cases, if the speed-up operation is prohibited, the work efficiency will be reduced, and extra time will be required until the speed reaches the set speed, which is an appropriate speed for mowing. There is such a disadvantage. Therefore, such a disadvantage is avoided as a configuration in which the speed increase prohibition state is released in the low speed state at the start of mowing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the combine includes a pair of left and right crawler traveling devices 1, a threshing device 2,
A mowing device 4 (mowing unit) is provided so as to be able to move up and down on the front side of the machine body V having the control unit 3 and the like. The reaper 4 is pivotally supported on the machine body V so as to be able to move up and down around a horizontal axis X, and is configured to be able to move up and down by a telescopic operation of a lifting hydraulic cylinder 5 as a lifting and lowering operation means. A weeding tool 6 for splitting and weeding the root portion of the culm to be harvested, an inducing device 7 for causing the lodged planted cereal culm, a cutting blade 8 for cutting the root of the caused cultivated cereal culm, The apparatus is provided with a transport device 10 for transporting the cut culm to a feed chain 9 for threshing on the rear side of the machine body while changing the culm into a sideways posture. In addition, a stock sensor S0 which is operated in contact with the stock of the harvested grain culm is provided at the transfer start end side of the transfer device 10, and the harvested grain culm contacts the stock sensor S0 during the harvesting operation. When the harvesting operation is completed, the supply of the harvested grain culm is interrupted and the grain culm does not come into contact with the stock sensor S0 and is turned off. It is detected whether or not it is in the state.

Next, a control configuration of the combine will be described with reference to FIG. The driving force of the engine E is transmitted to a hydrostatic continuously variable transmission 11 as a traveling transmission,
The output of the transmission 11 after shifting is the transmission case 1
A traveling transmission system is configured to be transmitted to a pair of left and right crawler traveling devices 1 via the second transmission device 2. The transmission 11
The speed change operation is performed by an electric motor 13 as an actuator for speed change operation, and the speed change operation is linked to a speed change lever 14 provided on the control unit 4.
The electric motor 13 is linked via a friction type transmission mechanism 15 in a linking path between the shift lever 14 and the transmission 11 in order to prioritize a manual shift operation by the electric motor 13 over a shift operation by the electric motor 13. Have been.

The power from the engine E is intermittently transmitted to the threshing apparatus 2 via a belt tension type threshing clutch 16 and is also intermittently transmitted via a belt tension type cutting clutch 17. It is configured to be transmitted to. A threshing clutch lever 18 and a reaping clutch lever 19 for artificially turning on and off the threshing clutch 16 and the reaping clutch 17, respectively, are provided in the control section 3, and the threshing switch SW1 and the reaping switch which are turned on in accordance with the on and off operations thereof. SW2 is provided. A rotation speed detection sensor S1 for detecting the rotation speed of the engine E; and a vehicle speed sensor S2 as vehicle speed detection means for detecting the vehicle speed based on the output rotation speed of the transmission 11 transmitted to the input shaft of the transmission case 12. Is provided.

The control unit 3 includes an elevating operation lever 20 for instructing an elevating operation of the reaper 4, and an elevating operation switch which is turned on by an elevating instruction operation (a swing operation to the ascending side) of the elevating operation lever 20. SW3, a lowering operation switch SW4 that is turned on by a lowering command operation (a lowering side swing operation) of the raising and lowering operation lever 20, an upper limit vehicle speed setting device 21 for setting an upper limit vehicle speed, and a vehicle speed auto switch 22 are provided. Have been. The upper limit vehicle speed setting device 21 is a variable resistor for adjusting the upper limit vehicle speed according to field conditions and the like. The upper limit vehicle speed is set in the range of 0.3 to 2.0 m / sec according to the rotation angle of the knob. You. The vehicle speed auto switch 22 is a manually operated push button switch that switches whether to execute automatic vehicle speed control.

A control device 23 using a microcomputer
This control device 23 includes a stock sensor S0, a rotation speed detection sensor S1, a vehicle speed sensor S2, and a threshing switch S
W1, reaping switch SW2, lifting operation switch SW3,
Each piece of detection information of the descending operation switch SW4, the upper limit vehicle speed setting means 21, and the vehicle speed auto switch 22 is input.
On the other hand, the control device 23 is configured to output a drive signal for the electric motor 13 and a drive signal for the electromagnetic control valve 24 that controls the pressure oil for the hydraulic cylinder 5 for lifting and lowering.

Since the rotation speed of the engine E decreases as the load of the engine E increases, and increases as the load of the engine E decreases, the control device 23 is used to determine the rotation speed of the engine E based on the detection information of the rotation speed detection sensor S1. , Load detecting means 101 for detecting the load of the engine E. Specifically, the engine speed RX (rpm) when the stock speed sensor S0, the threshing switch SW1, and the mowing switch SW2 are on and the vehicle speed is 0.1 m / sec or more is stored as the reference speed RS. However, when the above condition is satisfied, if an engine speed RX higher than the stored value of the reference speed RS is detected, the reference speed RS is updated to that value. Then, a rotation speed reduction amount (rpm) from the reference rotation speed RS to the engine rotation speed RX is detected as an engine load.

Using the control device 23, the engine load detected by the load detecting means 101 is maintained in an appropriate load range, and the detected vehicle speed detected by the vehicle speed sensor S2 is set to the upper limit vehicle speed setting means 21. The vehicle speed control means 100 executes a vehicle speed control for controlling the operation of the electric motor 13 so as not to exceed the set upper limit vehicle speed set by.

The control device 23 is provided with a lifting operation lever 20.
When the lifting operation switch SW3 is turned on, the electromagnetic control valve 2 is turned on while the lifting operation switch SW3 is turned on.
A lifting drive signal for the lifting hydraulic cylinder 5 is output, and the lifting hydraulic cylinder 5 is raised. When the lowering switch SW4 is turned on, a lowering drive signal to the electromagnetic control valve 24 is output and the raising / lowering hydraulic cylinder 5 is lowered while the lowering switch SW4 is turned on. Therefore, the command means SR is constituted by each of the lifting operation lever 20, the lifting operation switch SW3, and the lowering operation switch SW4.

The vehicle speed control means 100 operates until the set time elapses or the vehicle travels the set distance after the raising and lowering operation of the mowing device 4 is performed in accordance with the raising and lowering operation of the raising and lowering operation lever 20. Is configured to be set to a speed increasing prohibited state in which the speed increasing operation in the traveling transmission 11 is not performed regardless of the detection information of the load detecting means 101. Note that, in a low-speed state where mowing is started from the start of the mowing operation until the vehicle speed reaches a preset set vehicle speed, the speed increase inhibition state is released.

Next, vehicle speed control by the control device 23 will be described based on a flowchart. FIG. 3 is a main flowchart of the vehicle speed control, and FIG. 4 is a flowchart of a speed increase permission determination process for determining whether to set the speed increase prohibited state or release the speed increase prohibited state to permit the speed increase. Is shown. First, it is checked whether the stock sensor S0, the threshing switch SW1, and the mowing switch SW2 are in the ON state, and whether a start condition in which the vehicle speed is 0.1 m / s or more is satisfied. No control is performed (steps 1 and 2). If the start condition is satisfied,
The detected engine speed RX is compared with the reference speed RS. If the detected engine speed RX is larger than the reference speed RS,
The value of the detected rotation speed RX is updated and stored as the reference rotation speed RS (steps 3 and 4). The initial value of the reference rotation speed RS has been reset to zero.

Then, the reference rotation speed RS and the detected rotation speed RX
Is determined as the engine load (step 5), and if the engine load is within the appropriate range ΔL, the shift operation is not performed. When the engine load is larger than the appropriate range ΔL, a deceleration operation is performed (step 7). The engine load is within the appropriate range ΔL
When the detected vehicle speed is smaller than the upper limit vehicle speed, the speed increasing operation is performed only when the result of the speed increasing permission determination process described later is in the speed increasing permitted state, and the detected vehicle speed is lower. When the vehicle speed is higher than the upper limit vehicle speed and when the vehicle is in the speed increase prohibition state in the speed increase permission determination process, the speed increase operation is not performed (steps 8, 9, and 10).

Next, the speed increase permission determination processing will be described. As shown in FIG. 4, this process is based on the premise that the vehicle speed control activation condition is satisfied (step 11). Then, it is determined whether or not the vehicle body has traveled a set distance (for example, about 7 m) from when the harvesting operation is started, that is, when the stock switch S0 is switched from the off state to the on state (step 12). . Note that whether or not the vehicle has traveled the set distance can be obtained by calculation based on, for example, detection information of the vehicle speed sensor S2 and timer information. An appropriate vehicle speed (for example, 0. 1) set in advance as the vehicle speed appropriate for performing the mowing work before the vehicle travels the set distance.
9m / s)
A speed increase permission state is set (steps 13 and 15). After reaching the appropriate vehicle speed (for example, 0.9 m / s), the vehicle is in a speed increase inhibition state (step 14).

After the harvesting operation has been started and the vehicle has traveled for the set distance or more, it is checked whether or not the raising and lowering operation of the mowing device 4 has been performed with the raising and lowering operation of the raising and lowering operation lever 20.
When the elevating operation is performed, a timer counter is set to set a speed increase inhibition state (steps 16, 17, 1).
8). Until the timer counter is decremented to "0", the speed increase inhibition state is maintained (steps 19, 20, and 20).
21), when the timer counter becomes "0", that is, when a preset set time has elapsed since the raising and lowering operation of the reaper 4, the speed increase permission state is set (step 22).

With such a configuration, for example, as shown in FIG. 5, in a head-cutting state in which the cut portion of the planted cereal culm T whose tip portion is falling toward the combine side is cut, the cutting portion is provided with the planted cereal. Since the culm is sequentially taken into the machine side from the tip side, the work load involved in the mowing work is reduced, but in such a case, the pilot generally uses the weeding implement 6 to move the tip part and the field scene. Harvester 4 so that it goes between
Is moved to a lower position, and then the mowing unit 4 is raised and lowered to raise and lower the harvesting grain culm, so that the harvesting operation can be properly performed even on the lodging grain culm. The speed increase is prohibited by the raising / lowering operation of the device 4, and the vehicle speed does not increase against the intention of the driver.

[Alternative Embodiment] (1) In the above-described embodiment, in the low-speed state where the mowing is started until the vehicle speed reaches the set vehicle speed, the speed increase inhibition state is released. Instead of such a configuration, even if the mowing operation is performed immediately after the mowing operation is started, the speed increase may be prohibited.

(2) In the above embodiment, the speed increase is prohibited until a preset time elapses after the raising / lowering operation of the mowing device 4 is performed. Alternatively, a configuration may be adopted in which the speed increase is prohibited until the vehicle body travels the set distance after the raising and lowering operation of the reaper is performed. In this case, the detection that the vehicle has traveled the set distance is performed by a configuration obtained by calculation based on the detection information of the vehicle speed sensor and the timer information, or the number of rotations of the rotating shaft of the crawler traveling device 1 is detected and the count value is set to the set number of times. The present invention may be embodied in various forms such as a configuration for detecting the occurrence of a failure.

(3) In the above embodiment, the load detecting means 1
01 has a configuration in which the engine load is detected based on a down amount in which the engine rotation speed RX has decreased from the reference rotation speed RS. However, the present invention is not limited to such a configuration. For example, a torque sensor may be provided on a transmission path from the engine E to each unit. The engine load may be detected based on the magnitude of the torque.

(4) In the above embodiment, the vehicle speed detecting means S
Although the vehicle speed sensor that detects the vehicle speed based on the output rotation speed of the transmission 11 is used as 2, a vehicle speed sensor that detects the rotation speed of the drive shaft of the crawler traveling device 1 may be used.

(5) In the above embodiment, the transmission is constituted by a hydraulic stepless transmission. However, the present invention is not limited to this, and various transmissions such as a belt type transmission may be used. Also, the actuator for shifting operation is not limited to the electric motor 13, and may be a hydraulic actuator or the like.

(6) In the above embodiment, when the vehicle speed has not reached the preset proper vehicle speed, the mowing is determined to be in the low speed state. However, instead of such a configuration, the following configuration may be adopted. For example, the engine load detection data is sequentially stored in association with the mowing operation, and when the off state of the engine load to the large load side is large based on the engine load detection data, the upper limit vehicle speed value is automatically set to an appropriate value. The corrected upper limit vehicle speed value may be used as the upper limit vehicle speed value in the subsequent work process, and the corrected upper limit vehicle speed value may be used as the appropriate vehicle speed.

(7) In the above embodiment, the starting conditions for the vehicle speed control are that the stock sensor is on and the vehicle speed is equal to or higher than the set value, and that both the threshing switch and the harvesting switch are on. However, for example, when the threshing clutch lever is operated to engage the clutch, the mowing clutch lever is also operated in conjunction with the clutch to operate in a clutch engaged state, and only the information of the threshing switch is used without providing a mowing switch. It may be configured.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a block diagram of a control configuration.

FIG. 3 is a flowchart of a control operation.

FIG. 4 is a flowchart of a control operation.

FIG. 5 is a side view showing a cutting operation state.

[Explanation of symbols]

 Reference Signs List 4 reaping unit 5 lifting operation means 10 transmission device 100 vehicle speed control means 101 load detection means E engine SR command means

Claims (2)

[Claims] A reaper is provided at the front of the body so as to be able to move up and down freely, and the traveling transmission is automatically increased in speed and increased so that the load of the engine detected by the load detecting means is maintained at the target load. A combine provided with a vehicle speed control unit for decelerating, wherein the vehicle speed control unit performs a set time after the mowing unit is moved up and down, or until the vehicle body travels a set distance. A combine configured to be set to a speed increase prohibited state in which a speed increase operation is not performed in the traveling transmission regardless of detection information of the load detection unit. 2. The vehicle speed control means according to claim 1, wherein said speed increase prohibition state is released in a low speed state in which a mowing operation is started until the vehicle speed reaches a set vehicle speed. Combine.