JPH06227287A - Liquid crystal display device of agricultural machine - Google Patents

Abstract

PURPOSE:To send only necessary information to an instrument panel at a low cost and establish convenience for user by connecting a plurality of controllers via a communication circuit to the controller of the instrument panel having a liquid crystal display, and displaying various pieces of sensor information, etc., on the liquid crystal display. CONSTITUTION:A liquid crystal display 80 and a meter controller M are furnished on an instrument panel in front of the driver seat, and sensors and switches 82-87 for signals and wheel rotation such as a mode switching dial 53 are connected which are to be displayed immediately in linkage with the operation made by an operator. The meter panel controller M communicates with a host controller WX, generates communication between WX and EP, K, M in the sequence as named, exchanges various pieces of sensor information connected with no-clutch shift, full-time 4WD controllers EP, K connected through a communication circuit 60, and displays the result on the liquid crystal display 80. Thus a single liquid crystal display 80 can display various pieces of sensor information, and the configuration can be simplified and the cost be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display for agricultural machinery, and can be used for a tractor, a combine and the like.

[0002]

2. Description of the Related Art Various instruments are attached to agricultural machines such as tractors and combine to measure vehicle speed, engine speed, PTO.
It is known to display the number of revolutions and the like. On the other hand, agricultural machinery incorporates a large number of automation technologies such as direction control, tillage depth control, and elevation control. Therefore, it is not uncommon for a plurality of control controllers to be installed.

[0003]

By the way, in the case of such a conventional device, it is not only costly to arrange various instruments such as a vehicle speed meter and an engine tachometer in a number corresponding to the number of sensors, but not only the cost is high, but also the instrument panel. The size itself becomes large, and there is a risk that the operator may be lost in making a decision or may overlook the sensor information. In addition, a plurality of control controllers and the instrument panel are connected in parallel in the harness so that the sensor information on the control controller side is directly input to the liquid crystal display section provided on the instrument panel. Then, the system becomes large-scaled, the manufacturing cost increases, and unnecessary sensor information also flows, resulting in waste.

[0004]

SUMMARY OF THE INVENTION The present invention is proposed in view of the above-mentioned problems, and sends only necessary information to the instrument panel side at a low cost for the convenience of use by an operator. To do. Therefore, the following technical measures were taken. That is, a plurality of control controllers and a controller of an instrument panel equipped with a liquid crystal display are connected by a communication line, and various sensor information and the like connected to each controller are connected through the communication line. A liquid crystal display device of an agricultural machine is characterized in that the liquid crystal display is configured to display.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. First, the structure will be described. 1 is a tractor, and front and rear wheels 2 and 2 and rear wheels 3 and 3 are provided at the front and rear portions of the body,
The rotational power of the engine 5 in the bonnet 4 is appropriately decelerated by a transmission in the mission case 6 to reduce the front wheels 2, 2
And tell the rear wheels 3 and 3.

[0006] The transmission case 6 accommodates a reverse clutch 7 for switching between forward and backward movements, which is composed of a hydraulic clutch, a main transmission 8 having four shift stages, and an auxiliary transmission 9 having four shift stages. The transmissions 8 and 9 are operated by the operation lever.
Alternatively, the gear shift is electrically controlled by the operation member 10 such as a push button type switch. A command for gear shifting is issued from the gear shifting controller (EP) to each actuator (not shown) for moving the shifter. Specifically, when the operating member 10 is operated, the reverse clutch 7 is temporarily disengaged to become neutral, the actuator is actuated, the shifter shifter (not shown) is moved, and the shifter is moved to a predetermined position. If it is confirmed by the position sensor 14, the control circuit is incorporated so that the reverse scratch 7 is reconnected. In addition to this, the shift controller (EP) also includes a shift lock switch 15 and a linear shift lever.
16, the pressurizing valve 17 and the like are connected. The linear shift lever 16 is a lever for moving the machine body forward and backward, and when the shift lock switch 15 is pushed, the shift operation is kept in a prohibited state.

A hydraulic cylinder case 20 is fixedly provided on the upper rear portion of the mission case 6, and the hydraulic cylinder case is provided.
A single-acting hydraulic cylinder 21 is provided in the space 20, and lift arms 2 are provided on both left and right sides of the hydraulic cylinder case 20.
2 and 22 are rotatably supported. Lift arm 2
Lift rods 25, 25 are connected between the Nos. 2, 22 and the lower links 24, 24, and one of the lift rods 25 is composed of a double-acting hydraulic cylinder 25a capable of expanding and contracting. Top link 26, lower link 24, 2
A rotary cultivator 30 is connected to the rear end of the three-point link mechanism 28 composed of 4 so as to be vertically movable.

The rotary cultivator 30 has a main cover 31 which covers the cultivated part and a rear cover 32 which is rotatably pivoted at the rear part thereof, and the lower end edge of the rear cover 32 is slidably contacted with the ground. To detect changes in working depth. Therefore, the depth sensor 33 is installed above the rear end of the main cover 31. Rotary depth control, rotary control, position of rotary tiller 30
All hydraulic lifting controls such as depth are controlled by the host controller (W
X). The host controller (WX) includes a control lever 37 for moving the working machine up and down, a lift arm sensor 38 for detecting the rotation angle of the lift arm 22, a plowing depth adjusting dial 40 for setting the plowing depth, A slop sensor 42 for detecting the left and right tilt angles of the machine body, a stroke sensor 43 for detecting the length of the hydraulic cylinder-21,
An ascending solenoid 44 for controlling the main hydraulic lifting circuit of the working machine, a descending solenoid 45, and solenoids 46, 47 for expanding and contracting the hydraulic cylinder -21 for rolling are connected.

With such a structure, when the control lever 37 is rotated in the vertical direction, the working machine is position-controlled so as to have the height set by the control lever 37, and the working depth adjusting dial 40 is appropriately adjusted. When turned, the cultivating part of the rotary cultivating device 30 is controlled to be located at the adjusted position, and the host controller (WX) is also controlled.
When a tilt setting device (not shown) connected to the work machine is operated, the working machine is controlled to tilt to the set angle.

A full-time 4WD controller (K) for controlling the drive system of the front wheels 2 is provided for increasing the peripheral speed of the front wheels 2 and cutting the power of the front wheels 2. It is a thing. The high / low speed switching device 50 provided in the branch of the drive system of the front wheels 2 and the rear wheels 3 in the mission case 6 has a pair of hydraulic clutches arranged in front and rear, and a steering wheel. When the front wheel 2 is rotated by a predetermined angle while grasping the handle 51, the high speed side hydraulic clutch is engaged to switch the high / low speed switching device 50 to the high speed side, and when the steering handle 51 is returned to the original straight traveling state, the low speed side is switched. The hydraulic clutch is connected so as to switch to the low speed side. The speed ratio is set such that the peripheral speed of the front wheels 2 is approximately twice as high as the peripheral speed of the rear wheels 3 when the speed is increased, and the peripheral speeds of the front and rear wheels 2, 3 are substantially equal when the speed is low.

Further, when traveling on the road or turning at the end of the field, the two hydraulic clutches are disconnected to cut off the power to the front wheels 2, and the high / low speed switching device 50 is set to the neutral state. As shown in FIG. 3, the full-time 4WD controller (K) includes a mode switching dial 53, an input shaft rotation sensor 54 for detecting the rotation speed of the input shaft of the high / low speed switching device 50, and a high / low speed switching device. An output shaft rotation sensor 55 for detecting the rotation speed of the output shaft of 50, a steering wheel turning angle sensor 56, a 4WD solenoid 57 for switching the high / low speed switching device 50 to a low speed on the standard 4WD side, and a high speed for increasing the peripheral speed of the front wheels 2. A full-turn solenoid 58 for switching to the side is connected. The mode switching dial 53 is used to set the running mode of the front wheels. The 2WD / 4WD automatic switching mode,
You can switch between standard 4WD mode and front wheel speedup mode.

Further, on a dashboard 70 provided in front of the driver's seat, various monitor lamps 71, a tachometer 72 for displaying the number of revolutions of the engine 5, a main transmission device 8 and an auxiliary transmission device 9 are provided.
A liquid crystal display 80 is provided together with a shift position display lamp 73 for displaying the shift position, a water temperature gauge 74, and a fuel gauge 75. The display 80 displays the vehicle speed, the PTO rotation speed, the working depth, the abnormal message, etc. indicate.

The instrument panel 70 is provided with a meter panel controller (M), which displays information of sensors connected to other controllers while communicating with the host controller (WX). To do. As shown in FIG. 3, what is to be directly input to the meter panel controller (M) without communication is, for example, high-speed switching of the mode switching dial 53, the reset switch 85, and the auxiliary transmission 9. A sub-shift H speed sensor 86 for detecting the state, which needs to be displayed immediately in association with the operation of the operator, a wheel rotation sensor 82, a PTO rotation sensor 83, a PTO switch 84, and a fuel sensor 87 for detecting the amount of fuel. It is directly connected. This is to prevent the operator from feeling uncomfortable by displaying the status change at the same time as the operator's operation.

The above-mentioned host controller (WX), shift controller (EP), and full-time 4WD controller (K) are connected via a communication line 60.
The symbol CLK used in the figure means a clock input. In this embodiment, the controller for hydraulic control (WX) is used as a host controller, and the other controllers (M), (EP), (K) are handled as sub-controllers. Communication of host controller (WX)
It is configured to be done via.

Specifically, the normal sensor information is exchanged between WX and EP, WX and K, WX and M, and in this order, and the sensor information connected to each controller is exchanged. To do. Information other than sensor information that is useful for maintenance, such as controller model and controller
It is convenient for later management to include a transition version of LA. That is, when replacing a part such as when the controller malfunctions, the controller model and ROM version can be communicated by communication without removing the controller.
It becomes possible to know John, etc., so that replacement work can be done quickly, and mistakes in assembly are reduced. Further, in this embodiment, the microcomputer checker 90 can be further connected to the host controller (WX). Microcomputer checker 9
Reference numeral 0 is a tester for confirming whether or not the sensors and setting devices connected to each controller operate reliably.

Next, the flow chart of FIG. 4 will be described. This flowchart is a host controller (WX)
And the order of communication with other controllers (EP), (K), and (M). The plowing depth control, the horizontal control, and the position control are independently performed, and communication is first performed between the host controller (WX) and the speed changing controller (EP). For this reason, the host controller (WX) gives a reception permission to the speed changing controller (EP), and at the same time issues a transmission request. At this time, reception is prohibited for the other two controllers (M) and (K) (step S8). Then, the data of the shift controller (EP) is received (step S9), and when the reception is completed (step S10), the communication with the full-time 4WD controller (K) is started (step S11). When the communication with the full-time 4WD controller (K) ends (step S13), the communication with the meta-panel controller (M) starts (steps S15, S).
16). Thereafter, this process is repeated, and the host controller (WX) and other sub controllers (EP), (K),
The sensor information and the like are exchanged with (M). In this case, as is clear from the figure, the communication between the host controller (WX) and the meter panel (M) is the last. That is, once the host controller (WX) communicates with other sub controllers (EP) (K), the sensor information of each sub controller is once stored in the host controller.
To the host (WX) side, and then to the host controller (W
X) and the meta controller (M) communicate with each other, which is important and urgent for the worker from the information held by the host controller (WX) itself and the information held by the sub controller. I am able to send information quickly.

FIG. 5 illustrates how communication is performed between the meter panel controller (M) and the host controller (WX). When there is a transmission request from the host controller (WX), sensor information (wheel rotation sensor value, which is captured by the meter panel controller (M),
The PTO rotation sensor value, the sub-shift H speed sensor value, etc.) are transmitted to the host controller (WX). In the figure,
There are three types of screen contents displayed on the liquid crystal display 80 depending on the model. On the screen of type A, the PTO rotation speed is converted from the pulse obtained from the PTO rotation sensor 83 and obtained from the wheel rotation sensor 82. The vehicle speed is converted by the generated pulses and displayed on the liquid crystal display 80. Type B
In the model vehicle having the screen of, the plowing depth set value is displayed in addition to the PTO rotation speed and the vehicle speed. This setting value of the working depth is displayed based on the data sent from the host controller (WX). On the type C screen, the PTO rotation speed, the vehicle speed, and the plowing depth setting value are displayed. The theoretical vehicle speed based on the vehicle speed is displayed, and the vehicle speed based on the data of the wheel rotation sensor 82 is displayed after a certain period of time.

[0018]

As described above, the present invention is
A plurality of control controllers and a controller of an instrument panel having a liquid crystal display are connected by a communication line, and various sensor information and the like connected to each controller are connected through the communication line to the liquid crystal. Since the display is configured to display, various sensor information and the like can be displayed on one liquid crystal display, and each divided controller and the liquid crystal display are connected in parallel. Since the labor is saved and the configuration is simple, a low-cost liquid crystal display device can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a tractor and a working machine.

FIG. 2 is a front view of an instrument panel.

FIG. 3 is a control block diagram.

FIG. 4 is a communication flow chart of a host controller.

FIG. 5 is a flow chart of a meta controller.

FIG. 6 is a flowchart of screen display.

FIG. 7 is a flowchart of screen display.

FIG. 8 is a flowchart of screen display.

[Explanation of symbols]

 1 tractor 2 front wheel 3 rear wheel 7 river scratch 24 lower link 25 lift rod 28 three-point link mechanism 30 rotary tiller WX host controller EP speed change controller K full-time 4WD controller M Meter panel controller

Claims (1)

[Claims] 1. A plurality of control controllers and a controller of an instrument panel having a liquid crystal display are connected by a communication line, and various sensor information and the like connected to each controller are connected by the communication line. A liquid crystal display device for an agricultural machine, which is configured to display on the liquid crystal display device via a.