JPH0585121B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lift control device, and more specifically, a setting device for setting a target level of a ground work device connected to a vehicle body so as to be able to rise and fall, and This invention relates to a technology for adjusting a control system in a device configured to perform lifting and lowering operations of a ground work device based on signals from a sensor that detects the level of the work device, and a corrector corresponding to each of these setting devices and sensors. .

[Conventional technology]

Taking an agricultural tractor as an example, the vehicle body is equipped with the setting device, sensors, etc., and if these sensors are configured as similar analog types such as potentiometers, these sensors can be connected to specified settings. It is adjusted to output a set voltage by operating a semi-fixed resistor, etc. (references not listed).

[Problem to be solved by the invention]

Also, considering the work involved in adjusting sensors as mentioned above, the values of the signals output from these sensors often differ depending on the sensor, so for example, If a tester is used to adjust the sensor type, different numerical values must be read depending on each sensor, making the adjustment work cumbersome.

An object of the present invention is to construct a mechanism for easily adjusting sensors provided in a vehicle body as simply as possible.

[Means to solve the problem]

The features of the present invention include a setting device for setting a target level of a ground work device that is connected to the vehicle body so as to be able to rise and fall, a sensor that detects the level of this ground work device, and a corresponding one of the setting device and the sensor. a control direction determining means for performing a determining operation based on the signal from the input system; an output system that outputs an output to either an elevating drive unit that raises and lowers the corrector, and a display mechanism that indicates the operating direction of the corrector;
Signals from each of the correctors corresponding to these setting devices and sensors are inputted, and the output system is sent to the lifting drive unit in order to raise, stop, or lower the ground work equipment based on the judgment operation of the control direction judgment means. a control operation state in which at least three types of signals, including a rise signal, a stop signal, and a fall signal are output to the input system; a signal from the setting device or one of the sensors to the input system; The output system selects and inputs a signal from a setting device or a corrector corresponding to the sensor and causes the display mechanism to display the operating direction of the corrector based on the discrimination operation of the control direction discrimination means. The display mechanism is configured to be able to be freely switched between control operation states in which at least three types of signals, namely a rising signal, a stop signal, and a falling signal, are outputted, and its functions and effects are as follows. .

[Effect]

According to the above feature, the signal from one of the setting device and the sensor and the signal from the corrector corresponding to the setting device and the sensor are selected and input to the input system of the control device, In addition, by performing a control operation to display the discrimination operation signal of the control direction discrimination means on the display mechanism, the operating direction of the corrector is displayed on the display mechanism based on at least three types of signals, so that the operator can It becomes possible to operate the corrector in the proper direction based on the display of a single display mechanism.

That is, since this control device is equipped with a control direction determining means that determines the control direction based on an input signal, when adjusting the control system, the operation direction of the corrector is determined using the operation of this control direction determining means. This makes it possible to easily operate the control system from a position near the control device, without using a tester or the like as in the conventional case.

Incidentally, this control operation is expressed as in the flowchart of FIG. 1, and in this flowchart, the control direction determining means D expressed in steps #5 to #12 and the control operations in steps #26 and #27 are shown. This allows the display mechanism to determine the operating direction of the corrector and whether the corrector has reached a proper state.

〔Effect of the invention〕

Therefore, by making it possible to carry out control operations that rationally utilize the control operations of the control device of ground work equipment, for example, sensors such as The mechanism was rationally constructed so that adjustment work could be done easily.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 4, a lift arm 3 that swings up and down by the operation of a hydraulic cylinder 2 is provided at the rear of a vehicle body 1 equipped with an engine (not shown), and a lift arm 3 is provided on the right side of a driver's seat 4 provided in the vehicle body 1. A lever-type operating tool 5 for raising and lowering the lift arm 3 is provided on the upper surface of the rear fender 6.
A control box 7 is provided to control the operation of the agricultural tractor.

As shown in the figure, a rotary type ground work device 9 is connected to the rear end of the vehicle body 1 via a three-point linkage mechanism 8 that is raised and lowered by the lift arm 3. The ground working device 9 is equipped with a lift arm sensor 10 that detects the level of the ground working device 9 relative to the vehicle body from its swing angle, and the ground working device 9 is equipped with a The operating tool 5 is further provided with an operating tool sensor 12 that detects the amount of operation thereof.

As shown in FIG. 1, the control box 7 includes a control means C comprising a microprocessor (CPU), and amplifies the output signal from the control means C to control the electromagnetic pulp 13 ( A driver 14 for transmitting information to an elevating drive unit (an example of an elevating/lowering drive unit) is installed inside the machine, and a dial 15 for setting the plowing depth of the ground working device 9 is also provided. Further, the control means C includes an operating tool sensor 12, a lift arm sensor 10, a cover sensor 11, an input interface 17 into which a voltage signal from a plowing depth setting device 16 operated by the dial 15 is input, and the microprocessor ( CPU), a memory 18 in which a control program is set, and an output interface 19, and the control program includes a signal to raise the ground work equipment 9 at high speed, a signal to raise it at low speed, a signal to stop it, and a signal to lower it at low speed. , a control direction determining means D which outputs five types of signals including a signal for decreasing at high speed.

Further, in the agricultural tractor, the operating tool sensor 1
2, lift arm sensor 10, cover sensor 1
1. The plowing depth setting device 16 is configured to be adjustable using a part of the control program.

That is, the input interface 17 includes first, second, third, and fourth corrections for correcting the output signal values from the operating tool sensor 12, the lift arm sensor 10, the cover sensor 11, and the plowing depth setting device 16, respectively. Vessel 2
A system in which signals from 0, 21, 22, and 23 are input,
and push switch 2 for selecting the target to be adjusted.
4, and a system is formed in which a signal from an oil pressure switch 25, which detects whether the engine is in an operating state based on the pressure of lubricating oil in the engine, is input.

Further, on the output side from the output interface 19, as shown in the same figure or FIG. 26,2
6, 26, three light emitting diodes 27, 27, 27 indicating the operating direction of the selected corrector, and two drivers 28, 28 form an output system for the display mechanism E, which controls the elevation of the ground work equipment 9, and the control for operating the corrector is configured as follows.

As shown in Fig. 2, when the key switch (not shown) for starting the engine is operated, a signal from the oil pressure switch 25 is first input (#1 step), and the engine starts running. Determine whether the condition has been reached (#2 step).

When the engine starts operating, the flag is set to 1 (step #8), and signals from the operating tool sensor 12 and lift arm sensor 10 are input (step #4).

Next, the control direction is changed to three based on the signals from the operating tool sensor 12 and the lift arm sensor 10.
As a result, if the control direction is ascending or descending, it is determined whether the control direction is intermittent operation or continuous operation (steps #6 and #7), and then further divided into 5 types. The numbers "4", "3", "2", "1", and "0" are set for each control operation performed and held in a register (not shown) (#8 to #12
step).

Next, the flag is determined (step #13), the signals from the tilling depth setter 16 and the cover sensor 11 are input (step #14), and as in the case of position control described above, these tilling depth setter The control direction is divided into three types based on the signals from the cover sensor 16 and the cover sensor 11 (#15 step), and as a result, it is determined whether the control direction is an upward or downward movement and is an intermittent operation or a continuous operation. (Steps #16 and #17), and then set the numbers "4", "3", "2", "1", and "0" for each of the five types of control operations, and is held in a separate register (steps #18 to #22).

Further, steps #5 to #12 are referred to as control direction determining means D for position control, steps #15 to #22 are referred to as control direction determining means D for automatic plowing depth control, and these determining means D, D The elevator control system is configured to compare the numbers set in and perform control according to the larger number if there is a relationship in size, or to perform control according to the number if there is no relationship in size. (#23 step).

It should be noted that continuous operation means that the solenoid valve 13 is held in the operating position on the raising or lowering side and the ground work device 9 is raised and lowered at high speed, and intermittent operation means that the solenoid valve 13 is raised or lowered. The above-mentioned operation tool 5 is operated at a predetermined time interval to raise and lower the ground working device 9 at low speed. Position control is performed by operating the high setting position H, and the low setting position L
It is configured so that automatic plowing depth control can be automatically switched by operating the machine.

Furthermore, the above sensors can be adjusted using a key switch.
It is configured so that it can be performed when the engine is stopped while the ON operation is being performed, and when the engine is detected to be stopped in step #2, the flag is set to 0.
(#24 step), then input the signal from the sensor selected by pressing the push switch 24 and the correction signal for the sensor selected in this way (#25, Step #26), the operation direction is determined by the control direction determining means D for position control, and furthermore, the control direction of the correctors 20, 21, 22, 23 is determined in accordance with the number set by the determining means D. The selected operating direction is output to the display mechanism E (step #27).

The display mechanism E is attached to the display panel 29 as shown in FIG. Corrector 20, 2
Adjustment operating tools 20a and 21 of 1, 22 and 23 respectively
a, 22a, and 23a are arranged, and the sensors to be selected can be switched by pressing the push switch 24.

Also, the adjustment direction of the corrector is the three diodes 2.
Among 7, 27, and 27, when the central one is lit, it indicates proper condition, and when the central one and the side ones are lit, it is close to proper condition, and
Lighting on the sides indicates the need to operate in the direction indicated, and when only the side lights are lit, it is far away from the proper state, and the lighting indicates the need to operate in the direction indicated. represents.

Incidentally, when adjusting the operating tool sensor 12, for example, the signals from the operating tool sensor 12 and the first corrector 20 are A/D converted and input, and the operation is performed by calculating this input signal. The signal from the tool sensor 12 is set to a corrected value, and the digital signal set in this way is compared with the correction digital signal held in the memory, thereby determining the operating direction. I'm starting to be able to decide.

Incidentally, step #27 is referred to as correction signal generating means F.

[Another example]

In addition to the embodiments described above, the present invention may be configured such that the display mechanism is detachably attached to the vehicle body, the correction signal generation means may be configured to actually output the correction signal, and the control direction discrimination The means are logic circuits,
It is also possible to configure it as a hard circuit consisting of a comparator or the like.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the elevation control device according to the present invention, FIG. 1 is a block diagram showing the configuration of the elevation control device, FIG. 2 is a flowchart showing the operation of the control means, and FIG. 3 is a diagram showing the display panel. The figure shown in FIG. 4 is a side view showing the rear part of the tractor in a working state. DESCRIPTION OF SYMBOLS 1...Vehicle body, 9...Ground work device, 13...Elevating drive unit, D...Control direction determining means, E...Display mechanism.

Claims (1)

[Scope of Claims] 1. A setting device for setting a target level of a ground work device 9 that is connected to the vehicle body 1 so as to be able to rise and fall; a sensor that detects the level of the ground work device 9; The controller includes an input system into which signals from correctors corresponding to each sensor are input, and a control direction determining means D that performs a determination operation based on the signal from the input system, and a control direction determination means D that performs a determination operation based on the determination operation of the control direction determination means D. an output system that outputs a signal to either the lifting drive unit 13 that raises and lowers the ground work device 9 and the display mechanism E that indicates the operating direction of the corrector; the sensor;
Signals from each of the correctors corresponding to these setting devices and sensors are inputted, and the output system is used to drive the ground work device 9 up and down in order to raise, stop, or lower the ground work device 9 based on the determination operation of the control direction determining means D. A rising signal, a stop signal,
a control operating state that outputs at least three types of signals, including a falling signal; a signal from one of the setters or sensors for the input system; and a signal corresponding to the setter or sensor. from the output system to the display mechanism E in order to select and input a signal from the corrector to display the operating direction of the corrector on the display mechanism E based on the discrimination operation of the control direction discrimination means D. An elevator control device configured to be able to freely switch between control operation states that output at least three types of signals: a rise signal, a stop signal, and a fall signal.