JPH05260826A - Travel controller for working car - Google Patents

Abstract

PURPOSE:To obtain a travel controller capable of setting a working car in a proper controlled state of travel according to conditions of a field or the skill degree of an operator and improving the operating efficiency. CONSTITUTION:This travel controller for a working car is equipped with a speed change gear 4, capable of freely performing the speed changing operation by driving with an actuator 11 and interposed in a travel driving system for a machine body and an automatic deceleration controlling means B for driving and controlling the actuator 11 so as to automatically decelerate the speed change gear 4 based on a change in the engine speed. The controller is further provided with an operating tool 18 capable of changing and setting deceleration characteristics for the fluctuation in the engine speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a speed change device which can be operated to change gears by driving an actuator in a traveling drive system of an airframe and automatically decelerates the speed change device based on a change in engine speed. Therefore, the present invention relates to a traveling control device for a work vehicle, which is provided with automatic deceleration control means for driving and controlling the actuator.

[0002]

2. Description of the Related Art In the above-mentioned running control device for a work vehicle, as conventionally applied to a rice transplanter, for example, as disclosed in Japanese Patent Laid-Open No. 3-67509, a work running load is caused by a change in engine speed. When the engine speed falls below a predetermined set value by judging the magnitude of, the electric cylinder, which is an example of an actuator, is drive-controlled to automatically decelerate the transmission to the minimum speed. there were.

[0003]

In the above structure, the work is generally carried out in the full accelerator state during work running, but when the field scene is hard, the running load becomes large and the engine stops due to excessive load. Because there is a risk that
In such a case, the transmission is automatically decelerated to reduce the load on the engine. However, in the above conventional structure, the set rotational speed for decelerating operation is set to a predetermined constant value, and further, the decelerating operation is performed to the minimum speed until the engine rotational speed falls within the set range. Therefore, if you set the set speed to a relatively high level, for example, if the operator is an expert who operates the transmission to a position close to the maximum high speed position, Despite the output margin, the deceleration operation is frequently performed, which may reduce the work efficiency. Further, if the set rotational speed is set low, there is a problem that the engine frequently stops in a hard field, and there is still room for improvement. The present invention aims to eliminate the above-mentioned problems.

[0004]

A feature of the present invention is that the running control device for a working vehicle described at the beginning is provided with an operating tool capable of changing and setting a deceleration characteristic with respect to a change in the engine speed. is there.

[0005]

The engine speed changes depending on the magnitude of the work traveling load, but the deceleration characteristic of the transmission with respect to the fluctuation of the engine speed, that is, the set engine speed for deceleration at which the deceleration operation is started, and the deceleration operation are stopped. By changing the setting engine speed for return to return to the original speed change speed, or the deceleration amount from the current speed of the transmission by using the operation tool, the difference in hardness and softness in the field and the skill level of the operator can be changed. It is possible to arbitrarily change to a proper deceleration control state according to the above.

[0006]

As a result, it is possible to set an appropriate machine body traveling control state according to the situation of the field, the degree of skill of the operator, etc., and it is possible to stop the engine unexpectedly in a hard field or frequently in a relatively soft field. It is possible to prevent the adverse effect that the work efficiency is lowered due to various deceleration operations and the like.

[0007]

Embodiments will be described below with reference to the drawings. Figure 2
Shows a passenger type rice transplanter as a work vehicle. This rice transplanter is constructed by connecting a seedling planting device 2 to a rear portion of a riding type traveling body via a parallel four-link mechanism 1 so as to be able to move up and down. The traveling aircraft has an engine 3 in the hood at the front of the aircraft.
And the power transmission of the engine 3 is supplied to the front and rear wheels 6, 7 via the belt type continuously variable transmission 4 and the mission case 5 to configure the traveling transmission system so as to drive and drive the vehicle body. The seedling planting device 2 is driven by the power transmitted from 5 through the transmission shaft 8. The belt type continuously variable transmission 4
As shown in FIG. 1, each of the pulley 9 attached to the output shaft 3a of the engine 3 and the pulley 10 attached to the input shaft 5a of the transmission case 5 is configured as a split pulley type.
A cam mechanism 12 operated by an electric cylinder 11 (an example of an actuator) is configured to change the pulley interval in a contradictory manner to change the belt winding diameter, so that the speed change operation can be continuously performed. Then, the electric cylinder 11
Is a control device 15 equipped with a microcomputer based on the output of a potentiometer PM1 for detecting the operation amount of the gear shift operation lever 14 provided on the control panel 13 of the machine body.
It is configured to be controlled and driven by. That is, the actual operation amount of the electric cylinder 11 is configured to be fed back to the control device 15 by the stroke sensor 16, and the control device 15 extends and retracts the electric cylinder 11 so that the actual operation amount and the output of the potentiometer PM1 match. The shift control means A is provided in the form of a control program. Then, based on the change in the engine speed, the transmission 4
The control device 15 is provided with an automatic deceleration control means B for driving and controlling the electric cylinder 11 in order to automatically decelerate the electric gear from the set gear position by the gear shift operation lever 14 in the form of a control program. That is, the engine rotation speed detection sensor 17 that detects the rotation speed is provided near the output shaft 3a of the engine 3, and the output of the rotation speed detection sensor 17 is output to the control device 15.
And the detected rotation speed is a predetermined first set rotation speed N.
When it is less than 1, as shown in FIG. 3, the control device 15 automatically operates the electric cylinder 11 to the deceleration side to reduce the vehicle speed to reduce the load on the engine 3, and the detected rotation speed is set to the first setting. When returning to the high speed side up to the second set rotational speed N2 higher than the rotational speed N1, the electric cylinder 11 is operated to the high speed side and returned to the set speed V1 by the shift operation lever 14. Further, the control device 15 is provided with a discriminating means C for discriminating the type of engine, for example, a gasoline engine or a diesel engine, from the inclination of the fluctuation of the engine speed accompanying the fluctuation of the running load. Based on the result, each of the set rotational speeds is automatically set to a characteristic according to the engine of each type. An operation tool 18 for changing the set first set speed N1 is provided on the control panel 13, and the operation position of the operation tool 18 is detected by the potentiometer PM2 to control the output of the potentiometer PM2. 15, the control device 15 changes and sets the first set rotational speed N1 based on the output of the potentiometer PM2 to execute the deceleration control as described above. In other words, the worker is likely to have a large traveling work load in the field, for example, when the mud layer is deep,
When the mud layer is shallow, the first set speed N1 is changed to a higher level so that the engine is decelerated early so as not to stop the engine in a hard soil area. Even if the number of revolutions is slightly reduced, the deceleration operation is not performed so that the efficiency reduction due to frequent deceleration can be prevented [see FIG. 4].

[Other Embodiments] The operation tool 18 allows the first
Instead of changing the set rotation speed N1, the deceleration operation amount ΔV of the transmission 4 may be changed as shown in FIG.

It should be noted that although reference numerals are given in the claims for facilitating the comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Control system diagram

[Figure 2] Overall side view of rice transplanter

[Figure 3] Automatic deceleration control characteristic diagram

[Figure 4] Automatic deceleration control characteristic diagram

FIG. 5 is a characteristic diagram of automatic deceleration control according to another embodiment.

[Explanation of symbols]

 4 transmission 11 actuator 18 operation tool B automatic deceleration control means

Claims (1)

[Claims] 1. An actuator (1) for a traveling drive system of an airframe.
The transmission (4), which is capable of gear shifting by the drive of (1), is interposed, and the actuator (11) is drive-controlled to automatically decelerate the transmission (4) based on a change in engine speed. A travel control device for a work vehicle including automatic deceleration control means (B), the travel control device for a work vehicle including an operation tool (18) capable of changing and setting a deceleration characteristic with respect to a change in the engine speed. .