JPH0755095B2 - Combine speed control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a combine vehicle speed control device, and more particularly, to a transmission system mounted on a traveling system, which is interlocked with an engine, and A vehicle speed control means for decelerating and controlling the transmission is provided, and further provided with a turning travel detection means for determining whether or not the work vehicle is in a turning travel state, and an engine rotation detection means for detecting an engine speed of the work vehicle, When the work vehicle is in the turning traveling state and the engine speed becomes lower than a deceleration processing set value determined by the engine speed before turning, the vehicle speed of the combine vehicle is configured to operate. The present invention relates to a control device.

[Prior Art] Conventionally, as a vehicle speed control device of this type, when the combine is in a turning traveling state and the engine speed falls below a preset deceleration processing set value due to a load accompanying the turning traveling. A vehicle speed control device for performing the above-described deceleration control process has been developed only for the vehicle. For example, when the combine finishes the mowing work, goes straight on the headland and then turns, the accelerator setting is often changed in the headland so that the engine speed is lower than the deceleration setting value described above. I had to make settings. In such a case, if the deceleration processing set value is fixed, deceleration control processing is always performed during turning, and unnecessary control is performed. In order to deal with such a drawback, a control device has been proposed which determines the above-described deceleration processing set value based on the engine speed before turning.

[Problems to be Solved by the Invention] However, when the structure described above is adopted, the deceleration processing set value is determined in association with the engine speed in a straight traveling state before the start of turning traveling. When the vehicle enters the turning traveling while performing the threshing work, the deceleration control set value is determined from the engine speed in the state where the engine drop occurs due to the handling cylinder load accompanying the threshing work. Therefore, in such a case, since the set value is determined on the basis of the engine speed that is originally decreased, the engine speed is abnormally decreased, causing a problem such as engine stall.

Therefore, an object of the present invention is to eliminate the above-mentioned conventional drawbacks, and is a control device that performs deceleration control when the vehicle is in a turning traveling state and the engine speed is lower than a set value determined by the engine speed before turning. In order to obtain a combine vehicle speed control device capable of properly determining the deceleration processing set value and performing deceleration control even when an engine drop occurs due to cutting work or the like.

[Means for Solving the Problem] In order to achieve this object, in the above-described combine vehicle speed control device, an elapsed time detecting means for determining whether or not a set time has elapsed from the time when the mowing work is finished When the set time has not elapsed, the vehicle speed control means operates when the engine speed becomes lower than the preset reference target value.

[Operation] The vehicle speed control device of this combine is provided with the elapsed time detecting means. Then, by this means, it is first judged whether or not the combine has finished the mowing work and the post-setting time has elapsed. Then, within this set time, the vehicle speed control means always selects a general reference target value as the reference for the deceleration processing. This reference target value is a value for which deceleration control should be performed when the engine is used in an ideal state, and this value is not influenced by the actual state of the engine. Therefore, when the combine enters the turning state while being in the mowing and threshing work state, this value is always adopted as the reference for the deceleration processing, so that the deceleration control is not performed at an abnormally low value in the turning control.
Further, until the combine finishes the mowing and threshing work, and until the set time elapses, the same deceleration processing standard is adopted, so that the above-mentioned problem does not occur. By the way, if the set time has elapsed after the mowing and threshing work is completed, the engine rotation will be in a recovery trend with the completion of the work, and at the time when the set time has elapsed, the engine rotation in the normal straight running state is realized. Can be considered. Therefore, even if the deceleration processing set value is determined based on the engine speed at this time, it is possible to prevent the engine speed from abnormally decreasing.

[Advantages of the Invention] With the above-described structure, even if an engine drop occurs due to a mowing operation or the like, a vehicle speed control unit that works effectively against the engine drop is provided, and efficient and appropriate deceleration control can be performed. I was able to obtain a combine vehicle speed control device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, the combine is provided with a crawler traveling device (1) and a threshing device (2) as a working device in the machine body (V), and a mowing section (3) is provided at the front part of the machine body (V). )
And a control section (4) is provided.

The reaping unit (3) is a device for causing a grain culm in the field (5), a cutting blade (6) for cutting the root of the grain culm that has been caused, a rearward of the machine body while changing the posture of the harvested grain culm to a sideways posture. Each of the transport devices (7) transports toward the threshing feed chain (8) on the side. The mowing section (3) is provided so as to be movable up and down with respect to the machine body (V).

Then, a stock origin sensor (So) which is turned on by coming into contact with the stock of the grain culvert being transported, at the transport start end portion of the transport device (7).
Is provided.

If the explanation is added, the grain culm, whose stock is cut by the cutting blade (6), comes into contact with the stock origin sensor (So) as the cutting operation is started, and the stock origin sensor (So). Turns on,
In addition, as the harvesting work is completed, the grain culm supply is stopped and the stock origin sensor (So) is turned off.

And this sensor (S
There is provided a timer (S3) as an elapsed time detecting means (S3) which is started with the OFF operation of o) and discriminates and outputs the elapsed time of the set time (Ts).

As shown in FIG. 1, the engine (E) and the crawler traveling device (1) include a hydraulic continuously variable transmission (9) as a transmission and a pair of left and right steering clutch brakes (16). The engine (E) and the handling cylinder (10) of the threshing device (2) are linked together via a belt tension type threshing clutch (11).

A rotation speed sensor (S2) is provided as rotation detection means for detecting the rotation speed of the engine (E).

The speed change device (9) is interlockingly connected to a speed change lever (13) that is manually operated via a link mechanism (12).
A speed change motor (14) as a speed change actuator is interlockingly connected to the link mechanism (12) via a friction type transmission mechanism (15). That is, while the gear shift lever (13) can be artificially operated for gear shift, the gear shift motor (14) can also be used for gear shift operation automatically. The pair of steering clutch brakes (16) can be switched in four stages by a control valve (17). That is, there are four stages of "normal rotation", "clutch disengagement", "clutch disengagement and braking", and "reverse rotation".

The control valve (17) is connected to the operation lever (18) so that it can be artificially operated. The operating lever (18) is also connected to the elevating control valve (19) of the mowing section (3).

Although not described in detail, the operation lever (18) is of a cross swing type and is biased to return to the neutral position (N). Then, it can swing to the left and right in three steps. For example, 1 to the right
When swinging in stages, the power to the right traveling device (1) is shut off. When the vehicle is swung up to two steps, the braking force is further applied to the traveling device (1) on the right side. Then, in the third stage, reverse power is applied to the right traveling device (1). When it is swung to the left side, it also acts on the traveling device (1) on the left side. When the operating lever (18) is swung rearward, the mowing section (3) is raised, and when it is swung forward, the mowing section (3) is lowered so that the mowing section (3) is lowered. It is configured to operate the lifting cylinder (20).

Further, a turning sensor (S1) as a turning traveling detection means (S1) is provided near the base of the operation lever (18). Here, the turning sensor (S1) is for detecting whether or not the combine is in a turning traveling state, and when the operation lever (18) is kept at the machine turning position for a certain period of time, it is used as a turning signal. It is something to detect. The detection information of the turning traveling detection means (S1), the engine rotation detection means (S2), and the elapsed time detection means (S3) is collected in the vehicle speed control means (100) provided in the vehicle speed control device.

Below, by operating the speed-changing motor (14),
A vehicle speed control means (100) using a microcomputer for decelerating the vehicle speed will be described. The operation flow of the vehicle speed control means (100) is shown in FIG.

This flow is a flow for determining whether or not to execute the deceleration control process as the processing operation in step 6, and is a flow for selecting and deciding what reference value should be used for this deceleration control.

The steps will be described step by step. In this flow, when the combine is in the non-turning state, the process proceeds from the determination step 1 to step 1a. In this step 1a, the engine speed (R) from the speed sensor (S2) is averaged and stored as the straight running engine speed (Rx). And this process is continued as long as the straight traveling of the combine continues. Therefore, the rotation speed at the end of the straight traveling state is stored as the straight traveling engine rotation speed (Rx). As shown in the figure, this step 1a is completed, and the deceleration control process is not performed here. Now, such a straight traveling state is performed during the cutting operation or during a simple traveling state. When this is finished and the vehicle is in the turning traveling state, this operation flow shifts from Step 1 to Step 2. . Such a state corresponds to a state in which the combine finishes the cutting up to the end of the field and enters a turning state on an actual field. In step 2, it is determined whether or not the combine has passed the set time (Ts) after the end of the mowing work. If the set time (Ts) has not elapsed after the mowing work is completed, the deceleration control is performed by the reference target value (Ri) as the standard value regardless of the straight traveling engine speed (Rx) as shown in step 5. The execution of the process is determined. On the other hand, in cases other than the above, the straight running engine speed (R
Then, the process proceeds to a flow for determining the deceleration control set value (X) based on (x). That is, in step 3, the straight traveling engine speed (Rx) is compared with the reference target value (Ri) plus the margin value (I). And the rotation speed (R
If x) is low, the process moves to step 4, and if it is high, the process moves to step 5. The above-mentioned reference target value (Ri) is a value at which deceleration traveling should be performed when a load is applied when the engine is in an ideal maximum output state, and the above-mentioned margin value (I) is set by the operator. It is a surplus engine speed as a difference between the engine speed and the actual engine speed when the engine is considered to be in good use due to engine noise or the like when the vehicle is traveling straight ahead. In this state, step 5
The state that causes the transition to step 4 means that the accelerator setting is good, and in this state the engine power was used to output its maximum output under ideal conditions. , It means that the accelerator setting was low in the straight running state and the engine power was used with no margin. In such a case, in order to prevent unnecessary deceleration control processing in the latter case as well, the reference value as the deceleration control set value (X) for performing deceleration control processing is changed in steps 4 and 5. Of. That is, in step 4, a value obtained by subtracting the margin value (I) from the normal traveling engine speed (Rx) is selected as the deceleration processing set value (X), and when the current engine speed (R) is lower than this value. For the first time, the deceleration control process of step 6 is performed, and if it is high, this process is not performed. Further, in step 5, the above-mentioned reference target value (Ri) is selected as the deceleration processing set value (X), and if the current engine speed (R) is lower than this, step 6
The deceleration control process is performed, and if it is high, this process is not performed. In this control system, the deceleration control process at the time of turning traveling is determined by two values determined based on the engine speed in the straight traveling state. Moreover, before entering this flow, in the present application, it is judged whether or not a fixed time (Ts) has elapsed since the end of the mowing work,
The deceleration control set value (X) is not determined from the engine speed in the state where the engine drop is caused by the load on the handling cylinder, and it is possible to avoid a situation where the engine speed is abnormally reduced.

[Other Embodiments] In the above-described embodiment, the turning sensor (S1) as the turning traveling detection means is provided at the base of the operation lever (18), and the turning state is detected by detecting the position of this. However, this may be manually operated by the operator.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the present application, FIG. 1 is a mechanism diagram of a traveling system and a control system, FIG. 2 is a diagram showing an operation flow of a vehicle speed control means, and FIG. 3 is a side view of a combine. (9) …… Transmission, (E) …… Engine, (S1) ……
Turning traveling detection means, (S2) ... Engine rotation detection means,
(S3) ... elapsed time detection means, (100) ... vehicle speed control means.

Claims (2)

[Claims] 1. A vehicle speed control means (100) for decelerating and controlling the transmission (9) is provided while interlockingly connecting a transmission (9) mounted on a traveling system to an engine (E). The vehicle includes the turning traveling detection means (S1) for determining whether or not the vehicle is in a turning traveling state and the engine rotation detection means (S2) for detecting an engine speed (R) of the working vehicle, and the working vehicle is for the turning traveling. When the engine speed (R) is lower than the deceleration processing set value (X) determined by the engine speed (Rx) before turning, the vehicle speed control means (100) operates. In the combine vehicle speed control device configured as described above, the elapsed time detection means (S3) for determining whether or not the set time (Ts) has elapsed since the end of the mowing work is provided, and the set time (Ts) has elapsed. If there is no vehicle speed control The means (100) is a preset reference target value (Ri)
A vehicle speed control device for a combine, which operates when the engine speed (R) becomes lower than that. 2. When the set time (Ts) has elapsed, the vehicle speed control means (100) determines that the engine speed (R) during turning is a margin value (Ri) to the reference target value (Ri). If it is lower than the value obtained by adding I), the value obtained by subtracting the allowance value (I) from the engine speed (Rx) before turning is selected as the deceleration processing set value (X). When the engine speed (R) at the time is higher than the value obtained by adding the margin value (I) to the reference target value (Ri), the reference target value (Ri) is set to the deceleration processing set value (X).
The combine vehicle speed control device according to claim 1, which is selected as.