JP2542948B2 - Combine height control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention provides a mowing section elevating mechanism for maintaining a ground height of a mowing section of a combine at a predetermined value within a preset automatic range. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine cutting height control device that is drive-controlled, and more particularly to a cutting height control device that makes the automatic range different in a raising direction and a lowering direction.

(B) Conventional technology As a cutting height control device for combine harvesters, based on ground height information from a sensor that detects the ground height of the mowing section, the ground height of the mowing section is maintained at a predetermined value. It is known to drive and control the mowing section elevating mechanism while operating the manual operating device to give priority to the driving of the mowing section elevating mechanism (for example, Japanese Patent Publication No. 61-46084). Gazette, Jikken 2-6729, etc.).

In this case, in general, the height H ₁ that falls within the automatic range when the lowering operation for lowering the mowing unit from above is performed by the manual operating device and the raising of the mowing unit by the manual operating device in the controlled state. A height H ₂ is provided which is out of the automatic range when a raising operation for performing the operation is performed. Therefore, when the combine finishes turning in the headland and lowers the mowing section by the lowering operation by the manual operation device, when the mowing section descends to the height H ₁ , the mowing height control device enters the automatic control state. , The cutting height is automatically controlled. Also, after the completion of the mowing work for one stroke, when the cutting unit is raised to the height H ₂ by the raising operation by the manual operation device, the automatic cutting height control device is in the control release state, and even if the manual operation device is stopped, It does not descend due to control, and the mowing unit is held at a predetermined height.

In the conventional cutting height control device, the height H ₁
And, in the control state, the height H ₂ outside the automatic range in which the reaper is raised by the manual operation device is generally in the relationship of H ₁ = H ₂ .

(C) Problems to be Solved by the Invention However, in the case of the above-mentioned conventional cutting height control device, since the automatic range is the same whether the operation is performed from above or below, the cutting portion is manually operated from above. Height H ₁ to enter control state when lowering operation for lowering is performed
Since it is located at a low position, there is a risk of causing an erroneous operation such as not entering the control state due to an insufficient amount of lowering of the mowing unit at the beginning of cutting. On the other hand, in the control state, when the raising operation for raising the mowing unit is performed by the manual operation device, the height H ₂ that enters the control release state is at a high position. However, it was not easy to release the control, and it was troublesome to adjust the cutting height to the operator's intention.

Furthermore, during cutting work by automatic control, if there is unevenness in the field scene due to ridges or the like in a certain section, the operator manually raises to avoid the unevenness, but within the automatic range, if the manual operation is stopped, automatic control is resumed. Since the divider is caught on the uneven surface, the reaper is raised above the automatic range. Then, when the reaping section escapes from the uneven surface and returns to the automatic range again, the operator needs to manually operate for a predetermined time until it returns to the automatic range, which is troublesome and lacks in dexterity.

Therefore, the present invention has been made in view of the above circumstances, and when the lowering operation for lowering the reaper is performed from above by the manual operation device, the automatic control state is early entered and the manual operation is performed in the control state. An object of the present invention is to provide a combine cutting height control device capable of early entering an automatic control release state when a raising operation for raising a cutting unit is performed by an operating device.

(D) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention shows, for example, with reference to FIG. 1, within a preset automatic range, a mowing unit (12) (second). Based on the ground height information from the sensor (9) for detecting the ground height (see FIG. 3),
To keep the height of the reaper (12) above ground at a specified value,
When the operation of the manual operating device (3) is performed while driving control of the mowing section lifting mechanism (10, 11) is performed, the driving of the cutting section lifting mechanism (10, 11) is given priority to this manual operating device (3). In the combine cutting height control device of
When the lowering operation for lowering the mowing section is performed from above by the manual operating device (3), the automatic height (H ₁ ) in the lowering direction that falls within the automatic range, and the manual operating device in the automatic control state ( 3) By the reaper (12)
And a raising direction automatic height (H ₂ ) that is out of the automatic range when a raising operation for raising the height is performed, and the lowering direction automatic height is larger than the raising direction automatic height by a predetermined amount. It is characterized by consisting of values (H ₁ > H ₂ ) (see FIG. 4).

(E) Operation According to the above configuration, when the lowering operation for lowering the reaper (12) is performed from above by the manual operation device (3), the height H ₁ that enters the control state is high. Therefore, the control state is entered when the amount of lowering of the mowing unit (12) is relatively small. Further, when the raising operation for raising the reaper (12) is performed by the manual operation device (3) in the control state, the height H ₂ that enters the control release state is low. Therefore, the control release state is entered when the amount of raising of the mowing unit (12) is relatively small.

Therefore, the control state is surely obtained at the beginning of cutting, and when the cutting height is artificially adjusted in the control state, the cutting height can be adjusted as the operator desires.

Also, during the mowing work, if there is unevenness in the field scene, raising the mowing section by manual operation causes it to move out of the automatic range at a relatively low position, and the mowing section can be held at a predetermined height to perform work, and When the operator deviates from the uneven surface of the field and instantaneously lowers it manually, in this state, the mowing section is between the automatic height H ₁ in the lowering direction and the automatic height H ₂ in the raising direction. It becomes the automatic range, and the cutting height is automatically controlled.

The reference numerals in parentheses refer to the drawings and do not limit the configuration in any way.

(F) Example Hereinafter, one example of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram of a combine cutting height control device according to the present invention.

The main cutting height control device sets the automatic main switch 2, the raising switch 5 and the lowering switch 6 operated by the manual operation lever 3, and the control height H in the control unit 1 having a microcomputer as a main part. The setting device 7, the sensor 9 for detecting the height of the mowing section above ground, and the control valves 10 and 11 for raising and lowering are electrically connected.

Automatic main switch 2, manual operation lever 3, setting device 7
Is arranged in the control section of the combine. The sensor 9
As shown in FIGS. 2 and 3, it is attached to the mowing frame 13 of the mowing section 12. This sensor 9 is a transmitter
This is an ultrasonic sensor consisting of 15 and a receiver 16. The control valves 10 and 11 actuate a hydraulic cylinder (not shown) for moving the mowing section 12 up and down, and the hydraulic cylinder forms a mowing section elevating mechanism.

The main cutting height control device maintains the ground height of the mowing unit 12 within a preset range based on the ground height information from the sensor 9 that detects the ground height of the mowing unit 12, The control valves 10 and 11 of the reaper section lifting mechanism are driven and controlled. When the manual operation lever 3 is operated, the control valves 10, 11 are attached to the manual operation lever 3.
Give priority to driving. When the manual operation lever 3 operates the raising switch 5, the raising control valve 10 is driven, and when the manual operation lever 3 operates the lowering switch 6,
The lowering control valve 11 is driven.

In the main cutting height control device, the height H ₁ that enters the control state when the lowering operation for lowering the mowing unit 12 from above is performed by the manual operation lever 3 (lowering switch 6 ON),
The height H ₂ is set to enter the control release state when the raising operation for raising the reaper 12 is performed by the manual operation lever 3 in the control state (the raising switch 5 is ON). And, that is, as shown in FIG. 4, these heights
H ₁ and H ₂ define an automatic range for automatic cutting height control. In this automatic range, the cutting height from the sensor 9 is set to the cutting height H set by the setting device 7. It is controlled by a signal, but the height H _{1 is} within the automatic range by the lowering operation.
Is set to be larger than the height H _{2 that} is out of the automatic range due to the raising operation (H ₁ > H ₂ ). Therefore, the height range a (= H, which is out of the automatic range during the raising operation, but falls within the automatic range during the lowering operation). _1- H ₂ ) exists.

The control section 1 of the main cutting height control device configured as described above performs the processing shown in FIG.

That is, first, the automatic main switch 2 is determined (step S1). If the determination result is ON, then the manual raising switch 5 is determined (step S2). If the determination result is ON, then the current height (h) input from the sensor 9 and the release height (H ₂ ) are compared (step S3).
If the comparison result is h ≦ H ₂ , the control valve 10
Is driven to lift (step S5). Also,
If the comparison result is h> H ₂ , the automatic flag is set (step S4), and then the lift is raised (step S5). In this case, since the release height H ₂ is at a low position,
The automatic flag reset is done early. That is, the control release state is entered when the amount of raising the reaper 12 is relatively small. Therefore, the cutting height can be adjusted according to the operator's intention.

If the determination result of the manual raising switch 5 is OFF, then the manual lowering switch 6 is determined (step S6). If the determination result is ON, the current height (h) input from the sensor 9 and the start height (H ₁ ) are compared (step S
7). If the comparison result is h ≧ H ₁ , the control valve 11 is driven to lower the lift (step S9).
If the comparison result is h <H ₁ , the automatic flag is set (step S8), and then the lift is lowered (step S9). In this case, since the start height H ₁ is at a high position, the automatic flag setting is done early. That is, the control state is entered when the amount of lowering of the mowing unit 12 is relatively small. Therefore, the control state can be reliably obtained at the beginning of cutting.

After lowering the lift, the automatic flag is determined (step S10). As a result, if the automatic flag is set, the current height (h) input from the sensor 9 is compared with the control height (H) (step S11). If the comparison result is h> H, the control valve 10 is driven to raise the lift (step S5). If the comparison result is h <H, the control valve 11 is driven to lower the lift (step S12). If the comparison result is h = H, the control valves 10 and 11 are stopped and the lift is stopped (step S15).

If the determination result of the automatic main switch 2 is OFF, the automatic flag is reset (step S13), and then the manual switch is determined (step S14). As a result, if the raising switch 5 is ON, the control valve 10 is driven to raise the lift (step S5). If the lowering switch 6 is ON, the control valve 11 is driven to lower the lift (step S12). If the manual switch is OFF, the control valves 10 and 11 are stopped and the lift is stopped (step S15).

As shown in FIG. 6, the automatic height H ₂ in the raising direction and the automatic height H ₁ in the lowering direction are automatically set by the setter 7.
It is set within a predetermined range corresponding to (dial value).

(G) Effect of the Invention As described above, according to the combine cutting height control device of the present invention, the manual operation device (3) performs the lowering operation for lowering the cutting portion (12) from above. The height H ₁ to enter the control state when the control operation is performed and the height H ₂ to enter the control release state when the raising operation for raising the reaper (12) is performed by the manual operation device (3) in the control state. Since the heights H ₁ and H ₂ are set to H ₂ <H ₁ , the control state is entered when the amount of lowering of the mowing section (12) is relatively small, and the mowing section (12 The control is released when the amount of increase in () is relatively small. Therefore, the control state is surely obtained at the beginning of cutting, and when the cutting height is artificially adjusted in the control state, the operator can quickly and exactly adjust the cutting height.

Also, during the mowing work, if the field has an uneven surface, the operator manually raises the mowing section (12),
At a comparatively low position (H ₂ ), it goes out of the automatic range, the mowing part can be maintained at a predetermined height to continue the mowing work, and when the combine comes off the uneven surface, the operator momentarily manually lowers it. Just by operating, the automatic control is immediately restored, and the mowing work can be performed quickly and easily.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings each show an embodiment of the present invention. FIG. 1 is a circuit diagram of a combine cutting height control device according to the present invention, and FIG. 2 is a plan view showing a combine cutting unit. FIG. 3 is a side view showing a combine harvester, FIG. 4 is a schematic view showing the relationship between heights H, H ₁ and H ₂ , and FIG. 5 is a flow chart of the controller. FIG. 6 is a diagram showing the relationship between the set height H and the automatic range. 3 ... Manual operation lever, 7 ... Setting device, 9 ... Sensor, 10, 11 ... Control valve (lifting part lifting mechanism), 12 ... Mowing part.

Claims (1)

(57) [Claims] 1. Within a preset automatic range, the ground height of the mowing unit is maintained at a predetermined value based on ground height information from a sensor that detects the ground height of the mowing unit. While controlling the driving of the mowing section elevating mechanism, when an operation is performed by a manual operating device, in the combine cutting height control device of the system in which the driving of the mowing section elevating mechanism is prioritized by this manual operating device, An automatic height (H ₁ ) in the lowering direction that falls within the automatic range when a lowering operation is performed to lower the mowing section from above, and in order to raise the mowing section by the manual operation device in the automatic control state. said raised direction automatic height out of the automatic range and (H ₂₎ provided, and a predetermined amount large for the lowering direction automatic height the lower direction automatic height when raising operation of the is performed Value (H ₁
> H ₂ ) The cutting height control device for combine harvesters.