JPS6021926Y2 - Load control device for agricultural machinery - Google Patents

Description

[Detailed description of the invention] The present invention is a combination harvester or other agricultural machine, in which the running speed is controlled in accordance with the increase or decrease in the load acting on the installed engine that transmits power to various devices, and as a result, This prevents the engine from being stopped unexpectedly due to the load on various devices, and prevents situations such as making it difficult to smoothly perform processing operations on devices whose loads increase or decrease depending on the vehicle speed. The present invention relates to a load control device for an agricultural machine equipped with a vehicle speed control mechanism so as to prevent this from occurring.

As shown in Japanese Patent Publication No. 49-18964, a load control device for this type of agricultural machine increases or decreases the vehicle speed according to the movement of a governor linked to the rotation of the handling barrel of a threshing machine. Moreover, when restoring the once reduced handling cylinder rotation and vehicle speed to the acceleration side, conventional technology provides a mechanism that restores the vehicle speed with a delay in restoring the handling cylinder rotation to better eliminate overload. better known.

With the conventional structure configured as described above, the vehicle speed can be increased or decreased as the rotation of the handling cylinder changes, and the rotation of the handling cylinder can be restored prior to restoring the vehicle speed when increasing speed. It is useful in that overload can be eliminated relatively smoothly, but since the increase/decrease in vehicle speed and the rotation of the handling cylinder are increased/decreased at a speed corresponding to the degree of change in load, for example,
When the overload increases gradually, the vehicle speed is only gradually reduced. Therefore, the overload condition continues for a long time, which may have an adverse effect on various equipment and the processed material. When the vehicle speed decreases to 1, the vehicle speed increases relatively rapidly, which may cause the aircraft to jerk or the engine to stop.

In controlling the traveling speed according to the increase/decrease in the load acting on the engine, the present invention focuses on the degree of change in load, that is, the
The vehicle speed is controlled so that the traveling speed can be controlled without being affected by the acceleration of load changes, and so that the vehicle speed can be smoothly decelerated in the event of an overload, and can be increased without causing the engine to stop when the overload is removed. The purpose of the present invention is to provide a load control device for an agricultural machine that can perform the following tasks.

The features of the present invention to achieve the above objectives are as follows:
A load control device for an agricultural machine equipped with a vehicle speed control mechanism that automatically controls a vehicle speed according to an increase or decrease in a load acting on an on-board engine, wherein the vehicle speed control mechanism is configured to include a detector that detects an increase or decrease in the load; The traveling speed is reduced based on the detection result that the load detected by the device has increased beyond the permissible range of the reference load set in advance, and the traveling speed is reduced based on the result of the detection that the detected load has decreased below the permissible range. The control circuit includes a control circuit that outputs a control command based on a predetermined pulse signal to increase the traveling speed, and an operating device that operates the transmission to increase or decrease the speed based on the control command, and further includes The pulse signal is set to control the operation of the operating device so that the speed change acceleration during deceleration control is higher than the speed change acceleration during speed increase control, and from this configuration, the following effects can be obtained. play.

■In other words, when an overload occurs and when the overload is removed, the vehicle speed is increased or decreased based on a preset pulse signal, rather than being linked to the acceleration of the load change. Since the vehicle speed is increased or decreased with a predetermined acceleration, as with the conventional structure described above, depending on the degree of load change, the overload state may continue for a long time, or the vehicle speed may increase rapidly, causing the aircraft to jerk. , it is easy to avoid inconvenient situations such as the engine stopping.

■ In addition, the pulse signal for controlling the increase/decrease in vehicle speed is
Since the gear shift acceleration during increase/decrease control is set to be greater than the shift acceleration during speed increase control, the vehicle speed is quickly decelerated as the load acting on the engine increases, and the vehicle speed is reduced as early as possible. Among these, there are advantages in that overload is eliminated, and the vehicle speed is increased more slowly as the load decreases than in the case of deceleration, making it easier to deal with sudden increases in load during speed increase.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure shows a threshing device 2 on a crawler traveling device 1, and
The front part of the machine is equipped with other devices, an engine 3 that transmits power to these devices, a control seat 4, etc., and a pulling device 5, a reaping device 6, A combine harvester is shown as an example of an agricultural machine that is connected and equipped with a reaping pre-processing section consisting of a vertical conveyance device 7, etc., and while traveling, it pulls up and reaps grain culms to be planted, vertically conveys them, and transfers them to the rear threshing device 2. The stock is delivered to the feed chain 8, and the stock is conveyed by the feed chain 8, and then transferred to the handling cylinder 9.
(See Figure 2) is configured to handle and thresh the tip of the ear.

As shown in FIG. 2, the crawler traveling device 1 is driven by an output from a hydraulic continuously variable transmission device 10 that is linked to the engine 3.

Further, a transmission shaft 11 extending from the continuously variable transmission device 10 to the reaping pretreatment section is mounted on a protruding shaft, and the crawler traveling device 1
and the reaping pre-processing section are configured to be changed in speed at the same time.

The continuously variable transmission 10 is configured to shift gears as a swinging shift arm 13 is swinged via a link mechanism 14 by a swinging lever 12 that is pivotally installed near the pilot seat 4. It is configured.

Further, this combine is equipped with a vehicle speed control mechanism described below in order to control the traveling speed according to an increase or decrease in the load acting on the mounted engine 3 and to stabilize the load acting on the engine 3.

That is, an electric motor 16 is interlocked and connected to the swing link 14a interposed in the link mechanism 14 via a friction transmission mechanism 15, and these link mechanisms 14, friction transmission mechanism 15, and electric motor 16 Continuously variable transmission 1
The transmission motor 16 of this operating device 21 constitutes an operating device 21 that performs a speed change operation.
It is connected to a control circuit 20 that controls the operation of the .

This control circuit 20 is connected to a detector 18 that electrically detects the rotational speed of the engine 3, and based on the electrical signal value transmitted from the detector 18 and the engine rotational speed during normal operation. A comparison mechanism 17 is provided to compare the electrical signal value transmitted from the detector 18 with the electrical signal value, so that the signal value transmitted from the detector 18 is maintained within a required setting range.
It is configured to issue a control command to operate the electric motor 16 in forward and reverse directions.

Therefore, as the load acting on the engine 3 increases or decreases, travel control is performed to automatically and reversibly decelerate the travel speed based on the detected increase in the engine rotational speed, which increases or decreases. Through the control and the resulting reaping amount control, the load on the traveling device 1 and the stem culm processing load on the threshing device 2, the vertical conveyance device 7, etc. are increased or decreased, and as a result, while the engine 3 is operated at a rotational speed within the set range, (In other words, the reaping traveling work is performed while maintaining the engine 3 in a load state within a set range).

The control circuit 20 also includes a first speed increasing transmitter 19a and a second speed reducing transmitter 19b which transmit the control signal from the comparison mechanism 17 as a pulse signal to the electric motor 16. The width (1) of the pulse signal generated by the signal transmitter 19a is configured to be smaller than the width (l') of the signal generated by the second signal transmitter 19b. The speed change acceleration in is configured to be smaller than the speed change acceleration during deceleration control.

Therefore, deceleration control is performed quickly, and the engine
The aim is to recover the rotational speed of the engine, and the speed increase control is performed slowly, so that if the speed is increased all at once, a sudden load increase will occur.
This makes it possible to prevent adverse effects on speed increase control.

Incidentally, in implementing the present invention, it is convenient to configure the speed change acceleration so that it can be freely changed and adjusted, and to adjust it as appropriate depending on field conditions, crop conditions, etc.

Further, the deceleration control may be continuously controlled to achieve even more rapid load reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of the entire agricultural machine, FIG. 2 is a schematic diagram showing the vehicle speed control mechanism, and FIG. 3 is an explanatory diagram of pulse signal waveforms. 3...Engine, 10...Transmission,
18...Detector, 20...Control circuit,
21... Operating device.

Claims (1)

[Scope of utility model registration request] In a load control device in a vehicle speed control mechanism that automatically controls the vehicle speed by an increase or decrease in the load acting on the mounted engine 3, the vehicle speed control mechanism is controlled by a detector 18 that detects changes in the increase or decrease in the load, and a detector 18 that detects changes in the increase or decrease in the load. The traveling speed is reduced based on the detection result that the detected load has increased more than the permissible range of the reference load set in advance, and the traveling speed is reduced based on the detection result that the detected load has decreased than the permissible range. The control circuit 20 includes a control circuit 20 that outputs a control command that generates a predetermined pulse signal so as to increase Agricultural work characterized in that the pulse signal outputted from the controller is set to control the operation of the operating device 21 so that the speed change acceleration during deceleration control is greater than the speed change acceleration during speed increase control. Load control device for machines.