JPS61199704A - Plowing load controller in tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a load control device for plowing in a tractor, and the device is simple and sensitive, and the plowing load control device is capable of controlling the plowing load.
It has been devised so that

[Conventional technology]

Conventional tillage load control devices control the load acting on ground-based work equipment by raising and lowering the m-pressure control valve against the splash or torsion bar of the draft mechanism via the work equipment connection link mechanism.
However, the draft mechanism becomes complicated, and moreover, it is necessary for each working machine connecting link mechanism to be four in number for drafting.

[Problem that the invention seeks to solve]

This invention allows a ground work machine to move up and down so that the slip rate of the wheels that occurs during plowing work is within a set value, and detects this slip rate by detecting the relative speed of the local wheels with respect to the vehicle body. The load control device is simplified and the circumferential speed is calculated based on the large pulse-like output from the rotation side detection body installed locally on the wheel. It has been devised so that it can be performed in a large state.

[Means for resolving the gap and illumination point]

Ninthly, this invention solves the above problems by the following technical means t.
-Lectured.

That is, the 9Matsu load control device is configured to detect the slip rate of the tractor and control the slip rate within a set value. ) are rotating side detectors (Sa) that are provided around the wheel (1) and are arranged on the circumference of the wheel (1).
) is fixedly installed on the vehicle body to constitute the other side of the fixed side detector (
Plowing load control in a tractor, characterized in that the calculation is performed based on the pulse-like output induced when passing the side of the wheel (1), and the control is performed based on the circumferential speed difference of each wheel (1). It is a device.

[Effect]

Wheel (located near the local area of 11) nJj rotation side detection*sn
) rotates at a high circumferential speed, so the fixed side detection body (Sb
), the pulse shape induced in this hole becomes large, and the detection sensitivity of one circumferential speed and slip ratio is sufficiently high.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

@ 1 Figure [An electromagnetic induction type detector as shown in the plan view of the main parts of a tractor as an example of a vehicle, the side view in Figure 2, and the perspective view of the wheel (1) in Figure 3. (17 of Sl.
jt- As the rotating side detector (Sa), for example, a magnetic piece is fixed by embedding or gluing on the circumference of the tire (2) of the wheel (1) (in the illustrated example, the lug (3), and the detector ( As the stationary side detection body (Sb) that constitutes the other side of the rotation side, a magnetic proximity switch is attached to the main body (4) close to the rotating surface - of the one rotation side detection body (Sa), so that the rotation side detection body (Sa) It is provided so that the magnetic flux changes and outputs a pulse every time it passes near the fixed side detection body (Sb).

Fixed side detection object (Sb)? As an example of attachment, the front wheel (1) is attached to the drag arm (5), which is a member that steers and turns together with the wheel (i+), or the turning side gear case, and the rear wheel +11 is attached to the As shown in Fig. 4, which shows a longitudinal cross-sectional rear view of the main part, it is attached to the outer side of the 7-ender (6).

Then, the circumferential speed calculation circuit (7), which mainly consists of a counter,
The pulses generated by the respective detectors (3) are provided corresponding to the front and rear left and right wheels (1), and the pulses generated by the detectors (3) are sent to a circumferential speed calculation circuit (7) to calculate the circumferential speed per unit time. death,
This circumferential speed is input to the vehicle speed calculation circuit (8).

The vehicle speed calculation circuit (8) has the function of calculating all the vehicle speed, slip ratio, travel distance, etc. An example of the calculation logic is shown in the fs1 table. n may be changed and is not limited to this.

Table 1: Calculation table for vehicle speed, etc. The presence or absence of differential lock operation can be determined by switching the differential lock switch (9), and if four-wheel drive is to be performed, switching operation 1 of the four-wheel drive switch is used.

These data are respectively input to the vehicle speed calculation circuit (8).

In addition, the vehicle speed calculation circuit (8) also calculates the mileage based on the vehicle speed, and the vehicle speed is displayed on the vehicle speed display section aυ, and the slip rate is displayed on the slip rate display section α, indicating the mileage (or work distance). (by area) are displayed on the mileage display section a3 to notify the driver.

The plowing load control device specifies an appropriate slip rate setting value for efficient plowing work using a plowing load setting device (I) configured using something like a potentiometer. The slip rate setting value is input to the load control circuit I, and the tractor is adjusted so that the slip rate detection value calculated by the vehicle speed etc. calculation circuit (8) approximately matches the slip rate setting value. Hydraulic lifting mechanism? It is controlled by the lift cylinder α9 lift control valve utit-1 amplification drive circuit Kusunoki, and when the slip ratio detection value is smaller than the slip ratio set value, the lift cylinder (Lcj
Drain the pressure oil inside the lift arm or ground work equipment (
When the IIQ is lowered to increase the load and the slip ratio detection value is greater than the slip ratio setting value, lift cylinder a
Supply pressure oil to 9 to lift arm or ground work machine! L
The load is controlled to be small by increasing s.

Of course, the calculation 1 display and control described above are applied when the vehicle is traveling straight during work 1, and in order to avoid application during non-straight travel, a changeover switch that is activated by turning the steering handle shaft is provided. , the display and other operations may be cut off by operating this changeover switch.

In this example, the wheel (1) has many rotation side detection bodies (Sa).

Because of this arrangement, the number of pulses induced in the detector (S) per time is large, making it possible to sensitively detect changes in vehicle speed and slip ratio.

Even if such fluctuations do not cause much problem, for one towing vehicle, there may be one turning side detector (ren) per wheel (1), and the arrangement position may be at lug (3). (3) may be the recesses, and the arrangement intervals are not limited to the equal intervals shown in the illustrated example.

Further, although not shown in the drawings, the rotating side detection body C3&) may have a toothed protrusion formed near the outer circumference of the disc of the wheel.

Although it is possible to fix the magnetic material on the disk, the rotating side magnetic material (sa), in which the magnetic material is embedded or fixed in the tire, as shown in the illustrated example, is extremely inexpensive.

〔Effect of the invention〕

The tiller load control device for a tractor according to the present invention is configured as described above, and the load is controlled so that the slip ratio of the wheels tlH11, which occurs during plowing work, is within a set value. No matter what type of work equipment connection linkage mechanism is used, it is not designed for draft control, but plowing can control the load and does not require a complicated draft mechanism, so it can be used at low cost. It can be carried out.

Then, the circumferential speed of the wheel (
The local setting in 1) is calculated based on the large pulse-like output that occurs when the rotation side detection body (Sa) passes at a fast speed over the stationary side detection body (Sb), so The detection sensitivity is sufficiently high.

This allows precise load control.

[Brief explanation of the drawing]

The figure is l'j! of this invention! An example is shown, and the wJ1 diagram is of heavy weight! ! ! Fig. 2 is a side view of Fig. 1, Fig. 3 is a perspective view of the wheel, Fig. 4 is a longitudinal cross-sectional rear view of the main part in Fig. 2,
FIG. 5 is a block diagram of the control device. Explanation of symbols - (1)...Wheel (31...Detector (sa)...
...Rotating side detection body (Sb)...Fixed side detection body Fig. 3, Fig. 4N

Claims (1)

[Claims] Detect the slip rate of the tractor and calculate this slip rate as
The tillage load control device is configured to control the plowing load within a set value, and this slip rate detection is performed by a rotating side detector that constitutes one of the electromagnetic induction type detectors and is provided around the wheel. The difference in circumferential speed of each wheel is calculated based on the pulse-like output that is induced when the vehicle passes by the side of the fixed side detector fixedly installed on the vehicle body to constitute the other detector. 1. A tillage load control device for a tractor, characterized in that the tillage load control device is configured to perform plowing.