JP3020766B2 - Combine speed controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for shifting the speed of a traveling transmission, an engine speed detecting means for detecting an engine speed, and a work state detection for detecting whether or not a cutting work state is present. Means for detecting the change in the working state from the reaping work state to the non-cutting work state, the engine speed detected by the engine speed detecting means is equal to or greater than a set value. The present invention relates to a vehicle speed control device of a combine having a deceleration control means for controlling a deceleration operation of the actuator so as to be maintained.

[0002]

2. Description of the Related Art The above-mentioned vehicle speed control device of a combine is designed to prevent engine stall by automatically decelerating and reducing engine load when an overload occurs.
That is, in the harvesting operation in the combine, when one work process is completed and the process moves to the next work process, for example, as shown in FIG. 4, after turning about 90 degrees with the completion of one harvest process, It may take a so-called reciprocating mowing work mode in which the vehicle goes straight ahead, turns again approximately 90 degrees, and moves to the next work process located on the side opposite to the previous process.
When one reaping work process is completed and the vehicle turns,
Even if the harvesting operation has been completed, the threshing device has threshing work load in the threshing device, and the running load increases along with the turning, which increases the load on the engine. Sometimes, the automatic deceleration operation is performed. By the way, conventionally, when the engine speed falls below the set speed, it is determined that the load on the engine has increased, and the engine is decelerated until the engine speed returns to the set speed or higher.

[0003]

However, as described above, since the deceleration operation is performed until the engine speed returns to the set speed, the turning traveling ends and the straight traveling starts. In some cases, the engine speed may not be restored and the deceleration operation may be continued to perform unnecessary deceleration, and improvement has been desired. That is, as the running load is reduced after the turning operation is completed, the engine speed is restored, but due to the characteristics of the engine, there is a disadvantage that the engine speed is greatly reduced and the working efficiency is reduced. Was. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a feature of the present invention, in the vehicle speed control device of the combine described above, there is provided turning state detecting means for detecting whether or not the traveling body is in a turning traveling state. When the turning state detecting means detects the turning traveling state and the deceleration control by the deceleration control means is being performed, and when the turning state detecting means detects that the turning traveling state has changed to the non-turning state, The deceleration control means is configured to stop the deceleration control.

[0005]

When the engine speed is reduced below a set value due to an increase in the running load when the harvesting work in one work cycle is completed and the turning operation is performed immediately thereafter, the deceleration control means decelerates. The control is executed. At this time, even if the amount of decrease in the engine speed is large and the deceleration control amount is large, the turning state detecting means detects that the turning traveling state has changed to the non-turning state. Then, the deceleration control is stopped at that point irrespective of the state of increase and return of the engine speed, so that the vehicle speed can be prevented from being reduced more than necessary. At the point when the turning state is changed from the turning state to the non-turning state, the turning movement of the aircraft has been completed, and thereafter the running load is gradually reduced. There is almost no fear.

[0006]

As described above, in the round-cutting mode in which the vehicle is turned approximately 90 degrees immediately after the completion of the cutting operation in one stroke and the vehicle runs straight, it is possible to prevent engine stalls caused by an increase in the engine load. Stopping the deceleration control at an appropriate timing makes it possible to quickly increase the speed in the subsequent straight traveling, and to prevent a decrease in work efficiency due to unnecessary deceleration control, a combine vehicle speed control device Can be provided.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
As shown in the figure, a cutting pre-processing unit that cuts planted grain culm in front of a body 2 provided with a pair of right and left crawler traveling devices 1 and 1 and conveys the harvested grain culm rearward as the body travels. 5
Is connected by a lift cylinder 6 so as to be able to move up and down freely, and a threshing device 3 for threshing the harvested grain culm is mounted at the rear of the body 2, and a boarding operation unit 4 is provided on the right side of the pre-cutting processing unit 5.
Are provided to constitute a combine.

As shown in FIG. 1, the power of an engine E mounted on the body 2 is supplied to a threshing device 3, while a left and right crawler traveling device 1 is transmitted via a hydrostatic stepless transmission 7 and a transmission case M. , 1 are provided. The continuously variable transmission 7 is configured to be capable of automatically performing a shift operation by an electric motor 8 as an automatic shift actuator, and also configured to be able to perform a manual shift operation prior to the operation by the electric motor 8. That is, the speed change arm 7a of the continuously variable transmission 7 and the speed change lever 9 provided in the boarding operation unit 4 are interlocked and connected, and the friction holding mechanism 10 is moved in the linking path between the speed change lever 9 and the continuously variable speed change device 7. The electric motor 8 is linked to the electric motor 8 through a shift operation.

In the transmission case M, there are steering clutches 11R, 1 for operating the drive force from the continuously variable transmission 7 to the left and right crawler traveling devices 1, 1 in right and left directions.
The steering clutches 11R and 11L are respectively operated by hydraulic cylinders 12R and 12L so as to be turned on and off, respectively, and the steering lever 14 provided in the boarding operation unit 4 is swung left and right. By operating the control valves 13 for the hydraulic cylinders 12R and 12L, the left and right steering clutches 11R and 11L are selectively turned on and off to steer the aircraft.

[0010] When the transported culm is present in the transport path of the harvested cereal culm in the pre-cutting processing unit 5 and comes into contact with the root of the harvested cereal culm, it is turned on, and the transported cereal culm does not exist. And an engine speed sensor S1 [an example of an engine speed detecting means] for detecting the number of revolutions of the engine E, and a steering lever. A turning state detecting sensor S2 as turning state detecting means for detecting whether or not the operating state of the vehicle body 14 is in a turning traveling state;
After the change of the stock sensor S0 from the on state to the off state, that is, the change from the reaping operation state to the non-rearing operation state is detected, the engine speed detection sensor S1 is detected.
And a control device 15 as deceleration control means for controlling deceleration operation of the electric motor 8 for automatic transmission so that the engine speed detected by the control is maintained at or above the set value.

When the turning state detection sensor S2 detects the turning traveling state and the deceleration control by the control device 15 is executed, the turning state detection sensor S2
The controller 15 is configured to stop the deceleration control when detecting that the vehicle has changed from the turning traveling state to the non-turning state. That is, as shown in the control flowchart of FIG. 2, the control device 15 sets the stocking switch S0 in the threshing device 3 after the harvesting work in one work process is completed and the stock switch S0 is switched from the on state to the off state. When the running load due to the turning of the machine body and the like is increased and the engine speed N is lower than the set value K in a state where the cutting grain load is present and the threshing work load is present, the electric motor 8 is decelerated to the vehicle speed reduction side. To execute deceleration control. When the turning state detection sensor S2 detects that the turning state has changed from the turning state to the non-turning state while the deceleration control is being performed during the turning, the engine speed N has returned to the set value K. Even if there is no such control, the control device 15 stops the deceleration control at that time.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a control block diagram.

FIG. 2 is a control flowchart.

FIG. 3 is a side view of the front of the combine.

FIG. 4 is a plan view showing a cutting operation state.

[Explanation of symbols]

 7 Transmission 8 Actuator 15 Deceleration control means E Engine S0 Work state detection means S1 Engine speed detection means S2 Turning state detection means

Claims (1)

(57) [Claims] 1. An actuator (8) for shifting the speed of a traveling transmission (7), an engine speed detecting means (S1) for detecting a speed of an engine (E), and whether or not a harvesting operation is being performed. Operating state detecting means (S0) for detecting the engine speed after detecting that the detection result of the operating state detecting means (S0) has changed from a cutting work state to a non-cutting work state. A combined vehicle speed control device comprising a deceleration control means (15) for controlling a deceleration operation of said actuator (8) such that an engine speed detected by said means (S1) is maintained at or above a set value. A turning state detecting means (S2) for detecting whether or not the traveling body is in a turning traveling state is provided, and the turning state detecting means (S2) detects the turning traveling state and In the case where the deceleration control by the deceleration control unit (15) is running, when detecting that the turning state detecting means (S2) is changed from turning traveling state to a non-turning state,
A combined vehicle speed control device wherein the deceleration control means (15) is configured to stop the deceleration control.