JPH0336484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mechanism for automatically changing and setting the control target vehicle speed at each set time and by the set speed based on the detection result from the load detecting device of the working section. The present invention relates to a vehicle speed control device for a combine harvester, which is provided with a mechanism for automatically increasing and decelerating a manually operable traveling transmission so that the detected vehicle speed matches or almost matches the control target vehicle speed in a shorter time than the set time.

The vehicle speed control device described above suppresses hunting by changing the vehicle speed in stages by the action of the vehicle speed setting mechanism, and also controls the vehicle speed setting time of the vehicle speed setting mechanism to change the speed up to the control target vehicle speed by the acceleration/deceleration operation mechanism. By making it faster and in a shorter time than
This is designed to allow control to be performed with high precision and good followability. On the other hand, when working with the above-mentioned combine harvester, generally, as shown in Figure 5 A and B, there are places (A ), the aircraft will enter the location (A) at the speed Va that is currently displayed by automatic control, causing a sudden increase in the workload (R) or a drop in the vehicle speed V to the appropriate speed Vc. In order to prevent troubles such as improper processing of harvested grain culms before adjustment is made, when the machine reaches the position (P) in front of the point (A), an appropriate artificial adjustment is performed. Speed Vb
deceleration operation is performed. However, conventionally, even if the vehicle speed V is artificially decelerated, the control target vehicle speed a is maintained at the value before the deceleration operation, and as shown in FIG. Then, the vehicle speed is restored to the original speed Va, making it impossible to avoid the above-mentioned troubles, or having to maintain the transmission in a decelerating state to prevent the vehicle speed from increasing to the original speed Va. There were drawbacks associated with it.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the vehicle speed from rapidly increasing after a deceleration operation, and to easily prevent the above-mentioned trouble from occurring.

Next, an embodiment of the combine harvester of the present invention will be described in detail with reference to illustrative drawings.

As shown in Fig. 1, a device 1 for raising grain culms such as rice and wheat planted in a field, a cutting blade 2 for cutting the base of the raised grain culms, and a device 3 for carrying the harvested grain culms rearward by pinching them. The conveyed grain culm is held and conveyed by the feed chain 4 while being handled by the rotary handling drum 5, and the processed material is subjected to the blowing action of the winch 6 and the swinging sorting plate 7.
A threshing device 10 that performs a sorting process to collect fine grains by falling into a first port 8, collecting second particles by falling into a second port 9, and discharging straw waste from the device by the feeding action of the threshing device 10;
Each of the disc-shaped cutters 12 for shredding the threshed waste straw transported by the waste straw chain 11 is installed in a self-propelled machine having a crawler traveling device 13, an engine 14 for driving the various devices, a driver's seat 15, and a control box 16. It is attached to the aircraft.

As shown in FIG. 2, a part of the output of the engine 14 is transmitted by a belt to a hydraulic continuously variable transmission 17, and the output of the continuously variable transmission 17 is transmitted to a drive case 18 through a gear. The system is constructed so that the vehicle speed can be varied steplessly. Further, a part of the engine output is transmitted to the threshing device 10 and the cutter 12 in an intermittent manner using a belt tension type threshing clutch 19. Furthermore, although not shown, a part of the output of the transmission device 17 is transmitted to the lifting device 1, the cutting blade 2, and the conveying device 3.

A shift lever 20 is linked to the continuously variable transmission 17 via a link mechanism 21, and the lever 2
It is possible to manually operate the continuously variable transmission device 17 by adjusting the speed of the vehicle.

As shown in FIG. 2, a device 22 detects the load of the threshing device 10 as the driving torque of the handling drum 5, and a mechanism of this torque detection device 22 is used to determine the rotational speed of the handling drum from the rotational speed of the engine 14. (N)
A device 23 is attached to the threshing device 10 to detect the input rotational speed of the drive case 18 as a vehicle speed, and a device 24 is attached to the drive case 18 to detect the input rotational speed of the drive case 18 as the vehicle speed.
1. A reversibly rotatable electric motor 26 interlocked with the link mechanism 21 via a friction transmission mechanism 25 to enable preferential operation of the continuously variable transmission 17 by the lever 20; A mechanism 28 for increasing and decelerating the continuously variable transmission 17 is provided from a circuit 27a for driving the transmission 17 to the speed increasing side and a circuit 27b for driving the motor 26 to the decelerating side of the continuously variable transmission 17, respectively. The respective detection devices 22, 23, 24 and the increase/deceleration operation mechanism 28 are linked by a control mechanism 29 to constitute a vehicle speed control device. As shown in FIG. 3, when the vehicle speed is zero or close to zero, the driving torque of the threshing device 10 is below the set value, and the engine 14 is shifted to a set speed or higher, the engine Rotational speed (N ₀ )
a device 30 for storing the reference drive torque (T ₀ ) of the threshing device 10, a device 31 for setting the reference drive torque (T ₀ ) of the threshing device 10 in a changeable state; Four engine speed ranges (N ₁ ), (N ₂ ), (N ₃ ), (N ₄ ) divided at set speed intervals (△N)
and the setting torque interval (△T) between the increasing side and the decreasing side based on the reference threshing drive torque (T ₀ ).
4 threshing drive torque ranges (T ₁ ) divided at intervals;
The appropriate balance relationship between (T ₂ ), (T ₃ ), and (T ₄ ) is
In detail, as shown in Fig. 4, the larger the torque range, the _larger the speed range. The 16 balance states obtained based on the speed range (N ₁ )... are determined from (C ₁ ) to
(C ₇ ), and sets (C ₃ ) among these divided ranks (C ₁ ) as an appropriate balance relationship; a torque detection device 22 ;
Based on the signals from the speed detection device 24 and the appropriate balance relationship setting device 32, the actual threshing drive torque (T) and engine rotational speed (N) are set by the setting device 32 in the seven ranks. It determines which rank it is located in (C ₁ )..., and based on this determination result, shifting is not required in rank (C ₃ ), deceleration is required in ranks (C ₄ ) to (C ₇ ), and
At ranks (C ₁ ) and (C ₂ ), it is determined whether speed increase is required, and furthermore, the amount of deceleration is set such that it increases as it goes from rank (C ₄ ) to (C ₇ ). ₁ ) is larger than the rank (C ₂ ), and a discriminating device 33 that sets the amount of speed increase in a state where the rank (C 2 ) is made larger than the rank (C 2 ); A mechanism 34 for automatically changing and setting the control target vehicle speed a in increments of v, the signals from this vehicle speed setting mechanism 34 and the vehicle speed detecting device 24 are compared and determined, and if the detected vehicle speed and the control target vehicle speed a are different, it is detected. The speed increase drive circuit 27a or the deceleration drive circuit 2 is configured to cause the vehicle speed to match or almost match the control target vehicle speed a at set time intervals shorter than the set time t and at set speeds.
7b to apply an actuation signal to the acceleration/deceleration operation mechanism 2.
The control mechanism 29 is provided with a circuit 35 for automatically operating the control mechanism 8.

In short, each of the detection devices 22, 2 is configured to maintain the driving torque (T) of the threshing device 10 and the rotational speed (N) of the engine 14 within the torque range and speed range that have the appropriate balance relationship.
3 and 24, and the vehicle speed setting mechanism 34 updates the control target vehicle speed a every set time t and by the set speed. By causing the operating mechanism 28 to change the speed up to the control target vehicle speed a at set speeds and at set time intervals shorter than the set time t, the control is performed with less hunting and with good followability. The vehicle speed control device is configured to appropriately change and set the standard threshing drive torque (T ₀ ) according to grain culm conditions such as the lodging condition of the grain culm to be harvested, the wetness condition, and fluctuations in the amount of grain set. By this, the engine 14 is given as large a load as possible within its allowable load range, regardless of the grain culm conditions, and the threshing device 10 is
The vehicle speed can be automatically changed to apply as large a load as possible within the allowable range.
Power and threshing processing capacity are effectively used to avoid waste.

As shown in FIG. 3, the detection result from the vehicle speed detection device 24 and the deceleration rate of the vehicle speed when the increase/deceleration operation mechanism 28 operates to decelerate are compared and determined, and the deceleration rate of the actual vehicle speed is determined by the increase/deceleration operation. A detection device 36 configured to determine that the continuously variable transmission 17 has been artificially decelerated if the deceleration rate is greater than the deceleration rate by the mechanism 28, this detection device 36, and the vehicle speed detection device 2.
Based on the signals from each of the four, each time the detection device 36 enters a state of detecting that an artificial deceleration operation of the continuously variable transmission 17 has been performed, the corresponding control target vehicle speed a is sent to the vehicle speed setting mechanism 34. Each of the vehicle speed control devices is provided with a mechanism 37 that automatically adjusts the vehicle speed to the speed immediately after being artificially decelerated.

In other words, as shown in Figure 5 A and B, there is a point (A) in front where the threshing load (R) is large, such as where the grain culm is significantly collapsed, and the tip of the machine is at the point (A). When it reaches the near position (P), the transmission 17 is operated to reduce the speed V from the previous speed Va to an appropriate speed Vb, and the aircraft enters the point (A) at the same speed Va. In order to prevent a sudden increase in the threshing load (R) or a failure to thresh the grain culm introduced before the vehicle speed V is reduced to the appropriate speed Vc by the control device, By simply performing the deceleration operation in the gear shift operation 17, the automatic correction mechanism 37 automatically changes the target vehicle speed a controlled by the vehicle speed setting mechanism 34 from the value Va before the deceleration operation to the artificially decelerated speed Vb, and the vehicle speed is set. The speed at which the mechanism 34 has corrected the control target vehicle speed
Since the update setting is performed in stages from Vb to the high speed side, the vehicle speed increase by the vehicle speed control device is performed at a slow speed that is approximately in line with the control target vehicle speed a updated by the vehicle speed setting mechanism 34. , the vehicle speed when the aircraft enters the location (A) matches or almost matches the predetermined speed Vc that should be produced by the vehicle speed control device in accordance with the conditions of the grain culm in that location (A). As a result, the vehicle speed can be quickly adjusted to the predetermined speed Vc without requiring any operation to maintain the transmission 17 in a decelerating state.

In addition, in the above embodiment, the acceleration/deceleration operation mechanism 2
8, the speed change up to the control target vehicle speed a is performed stepwise at each set time and set speed, but it may also be performed linearly.In short, the vehicle speed setting mechanism 34 updates the control target vehicle speed. It is preferable to perform this in a shorter time than the set time t.

Further, in the above embodiment, the vehicle speed control device is configured to automatically change the vehicle speed based on the information from the threshing load detection device 22 and the engine rotation speed detection device 23. The vehicle speed may be changed only based on the information from the load detection device 22, such as when the vehicle is equipped with an engine 14.

The vehicle speed control device may be configured using a microcomputer or a logic circuit.

In summary, the present invention provides a vehicle speed control device for a combine harvester as described above.
an automatic correction mechanism 37 that operates on the vehicle speed setting mechanism 34 so that the control target vehicle speed thereby coincides with or almost coincides with the vehicle speed immediately after the artificial deceleration; It is characterized by having the following.

That is, according to the above configuration, when the vehicle speed V is decelerated, the automatic correction mechanism 37 is activated and the control target vehicle speed a of the vehicle speed setting mechanism 34 is automatically changed to the speed Vb corresponding to the decelerated vehicle speed. Then, the vehicle speed setting mechanism 34 sequentially updates the control target vehicle speed a from the set low speed value Vb toward the high speed side every predetermined set time t, so that the vehicle speed V becomes as shown in FIG. 5C. As shown, the vehicle speed is gradually increased in accordance with the control target vehicle speed a that is updated sequentially. Therefore, when the aircraft reaches a position (P) appropriately before the location (A) where the work load is likely to increase, simply by decelerating the transmission 17, the aircraft can be moved to the location (A) at a relatively low speed. Because it can be made to rush into
Since there is no need to operate the transmission 17 to maintain the low speed state by decelerating it as in the conventional case,
Furthermore, a mechanism that switches the control system to a stopped state in conjunction with the deceleration operation of the transmission 17 is automatically operated, and the control system is restored to the operating state when the aircraft enters the point (A). Unlike the case where the switching mechanism is configured to perform a reset operation, there is no need for a reset operation.
It is now possible to easily avoid problems such as sudden increases in workload and processing defects as mentioned above, and work can be carried out efficiently while minimizing processing defects regardless of changes in grain culm conditions. It became like that.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the vehicle speed control device for a combine harvester according to the present invention, FIG. 1 is a schematic side view of the combine, FIG. 2 is a transmission system diagram, FIG. 3 is a block diagram of the control device, and FIG. 4 is a schematic side view of the combine harvester. An explanatory diagram showing the relationship between the torque range and the speed range, Figure 5 A, B, and C are explanatory diagrams showing the grain culm state and the corresponding threshing load and vehicle speed.
The figure is an explanatory diagram showing a state of change in vehicle speed in a conventional device. 10...Working part, 17...Transmission device, 22...
Load detection device, 24...Vehicle speed detection device, 28...
Acceleration/deceleration operation mechanism, 34...Vehicle speed setting mechanism, 37...
...Automatic correction mechanism, t...Setting time, v...Setting speed.

Claims (1)

[Claims] 1. A mechanism 34 is provided that automatically changes and sets the control target vehicle speed at every set time t and by the set speed v based on the detection result from the load detecting device 22 of the working section 10, and the vehicle speed detected by the vehicle speed detecting device 24 is changed as described above. A mechanism 2 that automatically increases/decelerates a manually operable driving transmission 17 so as to match or almost match the control target vehicle speed in a shorter time than the control mechanism 10.
8. A vehicle speed control device for a combine harvester equipped with a
Based on the detection that the traveling transmission 17 has been artificially decelerated, the vehicle speed setting mechanism 34 is operated so that the control target vehicle speed thereby matches or almost coincides with the vehicle speed immediately after the artificial deceleration. A vehicle speed control device for a combine harvester, characterized in that an automatic correction mechanism 37 is provided.