JPH04250223A - Operation construction of work vehicle - Google Patents

Abstract

PURPOSE:To eliminate problems of operation by designing the operation construction of a work vehicle so that a means for switching control mode to either of composite control mode or single control mode is installed to the control unit. CONSTITUTION:A work vehicle is provided with hydraulic control valves V1, V2, V3 for driving a hydraulic drive means and a pair of right and left operation means 1a,1b. A first potentiometer PM2 for detecting right and left manipulated variable of operation means la and a second potentiometer PM2 for detecting the front and rear direction. Based on the detected values, the first and second hydraulic control valves V1, V2 are controlled. Additionally, a third potentiometer PM3 for detecting the manipulated variable of operation means 15 is installed. Based on the detected value, the third hydraulic control valve V3 is controlled. This constitution eliminates the need for special operation restraint and reduces the manipulation load.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to an operating structure for a working vehicle such as an agricultural tractor or a construction machine, and more specifically, the present invention is provided with an operating tool that can be freely swung in two mutually orthogonal directions from a neutral position. A work vehicle equipped with a control device that controls a first controlled object based on an operation of the operating tool in a first direction, and controls a second controlled object based on an operation of the operating tool in a second direction. Regarding the operating structure of.

0002

2. Description of the Related Art Conventionally, in the operation structure of the above-mentioned work vehicle, as disclosed in, for example, Japanese Unexamined Patent Publication No. 2-261304, the first controlled object can be controlled by operating the operating tool in the left and right direction. A hydraulic cylinder for vertical operation is operated, and a hydraulic cylinder for raising and lowering the reaping section is operated by operating in the front and back directions.A hydraulic cylinder for raising and lowering the reaping section is operated by operating the hydraulic cylinder in the front and rear directions. Some were constructed with a spring-type check mechanism that provided resistance to operation.

0003

[Problem to be Solved by the Invention] In the above conventional structure, since the objects to be operated in each direction of operation of the operating tool are different, when both objects to be controlled are operated simultaneously, the control force of the restraining mechanism is resisted. The operator consciously operates the operating tool in a diagonal direction to prevent the driver from accidentally controlling and driving other control objects when performing a single operation.

However, when the conventional structure described above is used in a work machine where it is often necessary to operate the operating tool diagonally to simultaneously operate both objects to be controlled, and where such operations are frequently performed,
The operator must operate against the biasing force of the spring,
This has the drawback of increasing the operating burden and reducing operability. In addition, there is a drawback that the operation structure is complicated, and there is room for improvement.

[0005] The present invention aims to eliminate the above-mentioned disadvantages.

[0006]

[Means for Solving the Problems] The characteristic configuration of the present invention is that in the operation structure for a work vehicle described at the beginning, when the operation tool is operated, the operation component amount along the first direction of the operation tool is used. a composite control mode in which the first controlled object is operated and controlled based on the amount of operation component along the second direction, and the second controlled object is operated and controlled based on the amount of operation component along the second direction of the operating tool; A selection control mode in which the larger of the operating component amount and the operating component amount along the second direction is selected, and only the controlled object corresponding to the selected direction is controlled based on the operating component amount. , a controlled object corresponding to a direction in which one of the operating component amount along the first direction and the operating component amount along the second direction of the operating tool is set in advance to the operating component amount. The control device is provided with a control mode switching means that can freely switch to either one of the independent control modes for controlling the operation based on the control mode.

[0007]

[Operation] When it is necessary to drive the first and second controlled objects simultaneously, setting the control device to the combined control mode allows the operator to control the target drive amount of both controlled objects. By operating the operating tool in a diagonal direction accordingly, it is possible to drive and operate each controlled object according to the operating direction component of each operating tool. Further, when it is necessary to selectively operate only one of the first and second controlled objects, by setting the control device to the selection control mode, the control device can be set to correspond to the selected controlled object. By operating in the direction, only the controlled object can be operated and driven. At this time, even if the operator accidentally operates the operating tool in a diagonal direction with respect to the selected direction, only the controlled object in the direction with the largest operating component will be operated, so the direction in which the operating tool is operated must be strictly controlled. There is no need to make it linear. Furthermore, when only one of the first and second control targets is operated in a fixed manner, only the operating component in the relevant operating direction is detected and controlled, so the operator can perform precise control without worrying about the operating direction. Management becomes unnecessary.

[0008]

[Effects of the Invention] Therefore, through rational improvement, there is no need to complicate the structure, such as by providing a mechanism to check the diagonal operation of the operating tool, and there is no special operation check when simultaneously operating both control objects. Since this is not necessary, various control forms can be realized with light operation and no operational burden, and it has become possible to provide something with excellent operability.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a control block for hydraulic drive operation of an agricultural tractor, which is an example of a working vehicle according to the present invention. This hydraulic control system includes three hydraulic control valves V1, V2, and V3 for driving hydraulic drive devices (not shown) such as hydraulic cylinders.
In addition, a pair of left and right operating tools 1a, 1b are provided, and each hydraulic control valve V1 is controlled based on the operation of each operating tool 1a, 1b.
, V2, and V3. To be more specific, the operating tool 1a on one side is provided so as to be swingable in the left-right direction and the front-rear direction from a neutral position, and a first potentiometer PM1 for detecting the amount of left-right operation of the operating tool 1a and the front-back operation are provided. A second potentiometer PM2 for detecting the amount is arranged, and a first potentiometer P
The first hydraulic control valve V1 is electrically driven and controlled based on the detected value of the second potentiometer PM2, and the second hydraulic control valve V2 is electrically controlled based on the detected value of the second potentiometer PM2. Further, the operating tool 1b on the other side is provided so as to be swingable in the front-back direction, and a third potentiometer PM3 is provided to detect the amount of operation of the operating tool 1b. It is configured to drive and control the third hydraulic control valve V3. The detected outputs of each of the potentiometers PM1, PM2, PM3 are given to a control device 2, and this control device 2 adjusts the hydraulic flow rate of each hydraulic control valve V1, V2, V3 in response to the detected value of each potentiometer PM1, PM2, PM3. Change control. In other words, each of the hydraulic control valves V1, V2, and V3 is constituted by an electromagnetic proportional flow control valve that can freely change and adjust the pressure oil flow rate by adjusting the valve opening degree in accordance with the drive current value, and the control device 2 is configured with each potentiometer. The drive current corresponding to the detected values of PM1, PM2, and PM3 is supplied to each hydraulic control valve V1, V2, and V3.

[0010] When operating the operating tool 1a, the first hydraulic control valve V1 (an example of a first controlled object) is controlled based on the amount of operating component along the left-right direction of the operating tool 1a, and , a composite control mode M1 in which the second hydraulic control valve V2 (an example of a second controlled object) is operated and controlled based on the amount of the operation component along the front-rear direction; A selection control mode M2 in which one of the larger operating component amounts along the direction is selected and only the hydraulic control valve corresponding to the selected direction is operated based on the operating component amount; An independent control mode M3 in which a hydraulic control valve corresponding to a direction in which either one of the amount of operating components along the left-right direction and the amount of operating components along the front-rear direction is set in advance is controlled based on the amount of operating components. The control device 2 is provided with a control mode switching means A that can freely switch to any one of the control modes. That is, this control device 2 includes a microcomputer, and the control mode switching means A is provided in the form of a control program, which will be described in detail below along with its operation.

As shown in FIG. 3, first, it is determined which mode setting state the mode selection switch SW1 is in (step S1), and if it is set to the composite control mode M1, the first and second modes are set. Potentiometer PM1, PM2
The respective detected values Xn and Yn are read, and the first and second hydraulic control valves V1 and V2 are driven and controlled according to the respective detected values (
Steps S2, S3). Specifically, the operating state of the operating tool 1a in each direction from the neutral position will be explained using a coordinate system. Point P (X1, Y1) in the first quadrant shown in FIG.
<Y1. ] or point Q(X2, Y2) in the third quadrant [
Note that X2>Y2. ) When operated to point P, the first hydraulic control valve V1 is driven by an amount corresponding to (X1) above, and the second hydraulic control valve V2 is driven by an amount corresponding to (Y1) above. is driven by a corresponding amount. When operated at point Q, the first hydraulic control valve V1 is driven by an amount corresponding to (X2) above, and the second hydraulic control valve V2 is driven by an amount corresponding to (Y2) above. or,
If the mode selection switch SW1 is set to the selection control mode M2, the first and second potentiometers PM1,
Read each detected value of PM2 (step S4), compare each detected value Xn, Yn, and set the first potentiometer P.
If the detection value Xn of M1 is larger, the first hydraulic control valve is driven and controlled according to the detection value Xn of the first potentiometer PM1, and if the detection value Yn of the second potentiometer is larger, the second potentiometer is controlled. The second hydraulic control valve V2 is driven and controlled according to the detected value Yn of PM2 (steps S5 to S7). Explaining using the above coordinate system, if the operation is performed at point P, the first hydraulic control valve V1 will not be driven, and the second hydraulic control valve V1 will not be driven.
Hydraulic control valve V2 is driven by an amount corresponding to (Y1) above. Also, when operated to point Q, the first hydraulic control valve V
1 is driven by an amount corresponding to (X2) above, and the second hydraulic control valve V2 is not driven. And independent control mode M
If set to 3, the operation target selection switch SW
Determine the switching setting position according to 2 (step S8),
When the first hydraulic control valve V1 is selected, the detected value Xn of the first potentiometer PM1 is read, and the first hydraulic control valve V1 is driven and controlled according to that value (step S9
, S10), when the second hydraulic control valve V2 is selected, reads the detected value Yn of the second potentiometer PM2, and drives and controls the second hydraulic control valve V2 according to the value (steps S11, S12). ). Explaining using the above coordinate system, if the operation is at point P, the first hydraulic control valve V1
is not driven, and the second hydraulic control valve V2 is driven by an amount corresponding to (Y1) above. Further, when operated to point Q, the first hydraulic control valve V1 is not driven, and the second hydraulic control valve V1 is not driven.
2 is driven by an amount corresponding to (Y2) above.

With this configuration, even when the operating tool 1a, which can be operated in a cross-swing operation, drives an object to be operated in only one direction, it is not necessary to set the operation direction strictly, and the comparison Even when the target is roughly operated, other objects to be operated will not be accidentally driven, and there is no need to elastically restrain operations of the operating tool 1a in diagonal directions, making the operation easy and convenient. It will improve your sexuality.

In the above embodiment, only one operating tool 1a is configured to perform a cross-swing operation, but the operating tools 1a on both the left and right sides,
Each of the actuators 1b may be provided so as to be swingable in a cross direction, and an object to be operated may be provided corresponding to each operation direction.

Although reference numerals are written in the claims to facilitate comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] Control block diagram

[Figure 2] Diagram explaining the control state using a coordinate system

[Figure 3] Control flowchart

[Explanation of symbols]

1a Operating tool 2 Control device A Mode switching means V1, V2
Controlled object

Claims (1)

[Claims] 1. An operating tool (1a) is provided which can be freely swung in two directions perpendicular to each other from a neutral position, and a first controlled object (1a) is controlled based on the operation of the operating tool (1a) along the first direction. An operation structure for a work vehicle, comprising a control device (2) for controlling a second controlled object (V1) and controlling a second controlled object (V2) based on an operation along a second direction, wherein the operating tool When operating (1a), a the operating tool (
1a), the first controlled object (V1) is operated and controlled based on the amount of operation components along the first direction, and the second controlled object (V1) is controlled based on the amount of operation components along the second direction. V2
), a composite control mode for operating and controlling the operating tool (
selecting the larger one of the amount of operation components along the first direction and the amount of operation components along the second direction in 1a);
a selection control mode in which only the controlled object corresponding to the selected direction is operated and controlled based on the amount of the operation component, c. A control mode that can be freely switched to one of the following control modes: an independent control mode in which a controlled object corresponding to a direction in which one of the operating component amounts is preset is controlled based on the operating component amount; An operating structure for a working vehicle, in which a switching means (A) is provided in the control device (2).