JP2528634B2 - Check device for field work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a check device for a field work machine such as an agricultural tractor, a combine harvester, and a rice transplanter.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of field work machine, a work section height control (positioning) for maintaining a constant work section height with respect to a machine body, such as an agricultural tractor, is provided. Control), a plowing depth control for maintaining a constant plowing depth, or a tilting control for controlling the tilting state of the working unit with respect to the machine body. A so-called microcomputer is used to perform various controls such as a tilting control. There is a controlled one. In order to perform such microcomputer control, various sensors such as a working part height detection sensor, a horizontal detection sensor, and a working depth detection sensor, or an automatic-manual switching switch, a setting device for setting a control state, and the like are used. It is necessary to input the signal from the signal input member to the control unit and to perform various operations based on the output control signal, but in order to perform microcomputer control normally, the control unit operates normally along with these inputs and outputs. Need to be present.

Therefore, it is necessary to check whether the input / output values of these signals and the control unit are normal. In this case,
Since it is troublesome and complicated to perform each check individually by artificial check operation, and the workability is inferior, it is also advisable to provide a dedicated check mode to automatically perform all the checks sequentially. .

However, all such checks have the problem that regular maintenance is sufficient, and the check time is long, resulting in poor maintainability.At the beginning of work, etc., check the necessary items. There is a problem of being sufficient.

[Means for Solving the Problems] The present invention was devised with the object of providing a check device for a field working machine capable of eliminating these drawbacks in view of the above circumstances, and a switch is provided. In the field working machine, the control command corresponding to the input signal from the signal input member such as a sensor is provided with a control unit incorporating a microcomputer for outputting to a signal output member such as a display. The control unit is set by dividing each check mode group for executing the check of the input signal from the signal input member, the self-diagnosis check of the control unit itself, and the check of the output signal to the signal output member. In the configuration for performing the check control for the check mode group selected from the check mode group, the control unit is A check mode group selection means for determining which one of the check mode groups is selected based on the connection state of the plurality of external terminals drawn out from the check mode group is provided, and the check mode group of the signal input member of each check mode group is provided. In the check mode group, signal change check means for determining whether or not there is a change in the input signal based on the operation of the corresponding signal input member, and the input signal from the signal input member set to the reference state are preset. And a reference value check means for checking whether or not the value is within the reference value range.

According to the present invention, with this configuration, an automatic check can be performed, but the check is made as the selected check mode group only so that the check time is not time-consuming.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, and a working section 2 (rotary tilling section) is connected to a rear side of the traveling machine body 1 through a lifting link mechanism 3. The working unit 2 is configured to move up and down as the lift arm 5 extending from the hydraulic case 4 vertically swings. Where 6 is a handle,
7 is a driver's seat, 8 is a front wheel, and 9 is a rear wheel.

Reference numeral 10 denotes a fender, and a cover body 12 for covering the fender 10 is integrally fixed to a concave groove 11 formed on one side portion (right side in the embodiment) of the fender 10. The position 12 has a position control lever 13 on the front side and the operation switch 14 for tilt manual control on the rear side.
However, a tilt setting device 15 and an automatic tilt switching switch 16 are provided on the rear right side, and a plowing depth setting device 17 and a plowing depth automatic switching switch 18 are provided on the left side, respectively, to control the posture of the working section. It constitutes the control operation unit. Moreover, the recessed portion 11 covered by the cover body 12 is internally provided with a control unit 19 incorporating a microcomputer as will be described later, and the lead wire 19a extending from the control unit 19 has an input coupler 20. , An output coupler 21, a power supply coupler 22, and a rotary mode switching plug 23 for switching adjustment by intermittently switching whether the working unit 2 is a center rotary type or a side rotary type, a normal working mode. Or the input signal check mode described later is provided by a check mode switching plug 24 that is switched by intermittently switching, and as described later, the check mode switching plug 24 and the input / output coupler 20, twenty one
Corresponds to the external terminal of the present invention.

The lead wire 19a to which the rotary mode switching plug 23 is connected is provided with a mark 23a so as not to be mistaken for the check mode switching plug 24.

On the other hand, the control panel 25 arranged below the steering wheel 6 has a key switch 26, a lighting switch 27, a fuel meter 28,
An engine temperature meter 29 and a speedometer (also serving as a tachometer) 30 are provided, but as a monitor lamp 31, in addition to the normally necessary one for batteries,
A set lamp 32 for position set, lamps 33, 34, 35 indicating each of the tilling depth states of shallow tillage, standard and deep tillage, and an inclination lamp 36 for displaying the automatic inclination are provided. A display unit that lights up based on a control command from 19 is configured. Further, the control panel 25 is provided with a switching switch 37 for manual control of the lift arm 5.

Reference numeral 38 denotes a mounting bracket integrally fixed to the side surface of the hydraulic case 4, and the mounting bracket 38 has an arm angle detection sensor 39 for detecting the swing angle of the lift arm 5, that is, the working portion height. , And an inclination detection sensor 40 for detecting the inclination angle of the traveling vehicle body 1, respectively. The arm angle detection 39 is provided around the axis of the lift arm 5 along the long hole 39b with the bolt 39a loosened. The mounting angle can be adjusted by swinging the lever. Further, the inclination detection sensor 40 can adjust the attachment angle by attaching / detaching a proper spacer (not shown) between the inclination detecting sensor 40 and the horizontal attachment surface 38a of the attachment bracket 38. Further, the link rod 41 is attached to the flat plate 2a of the working unit 2.
The tilling depth detection sensor 41, which is interlocked and coupled via a connecting member made of a or the like, is integrally attached to the tilling frame 2b side, but the tilling depth detection sensor 41 is similar to the arm angle detection sensor 39 in the bolt 41a. The mounting angle of the sensor shaft can be adjusted by swinging it along the long hole 41b around the axis of the sensor shaft in a loosened state. Further, a lever angle detection sensor 42 for detecting the operation angle of the position lever 19 is provided at the base end portion of the position lever 13, and further, one link of the lifting link mechanism 3 and the lift arm 5 are provided. The length of the lift rod 5a connecting the two is adjustable by the telescopic cylinder 43, and the tilting posture of the working unit 2 with respect to the traveling machine body 1 can be controlled by the telescopic operation of the telescopic cylinder 43. There is a stroke sensor 44 on this telescopic cylinder 43.
And these sensors 39, 40, 41, 44, and the members such as the various switches 14, 16, 18, 37, the setters 15, 17 described above,
The signal is input as a signal input member. Interface 45
The control unit 19 outputs the necessary control command via the output interface 46 based on the result of calculating these input values to control the posture of the working unit 2. It is designed to perform necessary control such as.

Next, a procedure example of the check method in the control unit 19 will be described using a flow chart, but in the present embodiment,
As the check, in addition to the input check mode group for checking the input signal from each of the signal input members,
Further provided are a control section check mode group for checking whether the control section 19 itself is normal or defective, and an output check mode group for actually displaying an output value to a signal output member such as a display to check in detail. That is, the control unit 19 determines whether or not any one of these check modes is set, as will be described later, in the state where the key switch 26 is turned ON, and it is determined that all check modes are not set.
If NO is determined, the signals from the signal input member are input as they are, the comparison calculation is performed based on those input values, and as a result, the control command is output to the corresponding operating mechanism such as the solenoid. Thus, necessary control of the body attitude and the like is performed, and thus the main control by the micro computer is performed.

On the other hand, in order to select any of the above-mentioned check mode groups, it is necessary to take necessary measures in advance with the key switch 26 in the OFF state, but first, in order to select the control section check mode group, the control section 19 I / O couplers 20 and 21 which are connected external terminals can be removed and connected to the couplers 47a and 47b of the cord checker 47, and when the key switch 26 is turned ON in this state, the control unit 19 , It is determined YES as the control unit check mode group is selected, thereby the self-diagnosis defined processing is performed, based on this result, it is determined whether the control unit 19 is normal, If YES is determined to be normal, the alarm 47c provided in the cord checker 47 emits a buzzer sound of a constant cycle to notify that it is normal. If it is determined that No buzzer sound is generated from the alarm device 47c, which allows the operator to check the suitability of the control unit 19.

Also, when selecting the input check mode group,
It suffices to pull out and disconnect the check mode switching plug 24 described above. When the key switch 26 is turned on in this state,
The control unit 19 makes a YES determination that the input check mode group is selected. Then, the control unit 19
The switches 14, 16, 18, 37, sensors 39, 40, 41, 4
4, the input signals from the signal input members such as the setters 15 and 17 have not changed, that is, whether or not a voltage change has been caused by operating these individual signal input members, respectively. If it is determined that NO due to the change in the operation of the signal input member, it is determined that the corresponding signal input member is normal, thereby the control panel 25 A buzzer-type alarm 48 provided (this alarm is used by, for example, issuing a buzzer sound to notify an operator when an abnormality occurs during the main control). However, even if the signal input member is activated, there is no voltage change and YE
If the judgment of S is made, there is no buzzer notification from the alarm 48, and accordingly it can be judged that there is an abnormality in the corresponding signal input member.
It is possible to check the suitability of the corresponding signal input member depending on whether or not there is a notification from.

Further, when this input check mode group is selected, a check is made as to whether or not there is a voltage change based on the operation, and at the same time, a check is made as to whether or not this signal input is based on a correctly set reference value. That is, in this check, the setters 15, 17 and the sensors 39, 40, 41, 44
Is set to a preset reference state (for example, by operating the setter itself or moving a member provided with a sensor). Then, it is determined whether or not the input values to be input are the reference values (values having a certain fixed range) set in advance, and if the input values are the reference values, a NO determination is made. A preset monitor lamp (for example, the set lamp 32 in the case of the position lever 13) is turned on, but YE
When the judgment of S is made, the monitor lamp 31 is set so as to be a shaded light, and by this, it is judged whether or not the signal input member is in the proper set state. become.

Finally, when selecting the output check mode group,
As shown in FIG. 15 (B), a separately prepared output check indicator 49 may be connected to the output coupler 21. When the key switch 26 is turned on in this state, the control section 19 outputs the output check mode group. If YES is selected, YES is determined. Then, in the output check indicator 49, the control unit 1 is operated by operating the switching switch 49a.
The output signals from 9 are sequentially selected, and the output values are displayed on the digital display section 49b so that each specific output value can be known. .

In an embodiment of the invention constructed as described above,
If you want to check the suitability of a signal input member such as a switch, with the check mode switching plug 24 removed,
It suffices to perform the necessary ON / OFF switching of the signal input member, or the operation such as dial or lever adjustment, and when there is a voltage change due to these operations, the alarm 48 emits a buzzer sound, and If there is no buzzer sound, the operator can immediately determine the suitability of the activated signal input member by identifying different notifications of the presence or absence of a buzzer sound when the signal input member is activated. You will be able to recognize it.

For the operation of the signal input member, this is the switch 1
In case of 4, 16, 18, 37, by ON-OFF switching operation,
In the case of the sensors 39, 40, 41, 44, by adjusting the position of the sensor itself, swinging the lift arm or flat plate or changing the link length to change the sensor shaft or change the stroke. Further, in the case of the setting devices 15 and 17, it is done by operating a lever or a dial.

Further, when this input check mode group is selected, it is possible to check whether or not the settings of the signal input members such as the sensors 39, 40, 41, 44 and the setters 15, 17 are correct. That is, in this case, the signal input member is in the reference state, for example, in the case of the position lever 13, it is in the uppermost temperature rising position or the lowermost position, and in the case of the tilt sensor, the machine body is in the horizontal posture. It is determined whether or not these detected values match the preset reference values under the standard conditions, and if they match, the corresponding monitor lamp lights up and they must match. If it does not light, it can be judged immediately. If they do not match, the angle can be adjusted or the position can be adjusted by the corresponding sensor or setting device to adjust them.

As described above, in the case where the present invention is implemented, when it is desired to check the suitability of the signal input member, the input check mode switching plug 24 is simply removed without separately using a dedicated indicator. Then, the control unit 19 can be switched to the state in which the input check mode group is selected,
Moreover, the appropriateness check of the signal input member can be displayed by effectively using the alarm device 48 or the monitor lamp 31 provided from the beginning by activating the corresponding signal input member. Therefore, the check of the signal input member can be surely performed without using a dedicated display device, and each user can check the signal input member as needed.

Furthermore, the control section check mode group, the output check mode group can be selected, and since only these selected check mode groups are checked, it does not take time and effort to check all automatically. You can check only the necessary check groups.

In this case, when performing the self-diagnosis check of the control unit 19, the input / output couplers 20, 21 corresponding to the external terminals are used.
I will disconnect and connect the cord checker 47,
The normal and abnormal check results of the control unit 19 are made by the buzzer sound from the alarm 47c provided in the cord checker 47, so that the operator can check the suitability of the control unit 19 by a simple mechanism. It can be judged.

Further, in the case of specifically checking the output value to each signal output member, if it is desired to accurately grasp the output value, the check may be performed using the output check indicator 49. In this case, This is convenient because you can check the displayed values accurately and make highly accurate adjustments. Especially, this one switches the check of each output signal.
Since the display can be sequentially switched by switching 49a, there is an advantage that the display unit 49b can be one.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but there are various things such as a buzzer sound, lamp lighting, etc. as means for notifying abnormality of check result, normality. When it is a sound, it can be determined not only by the presence or absence of the sound but also by the continuation of the sound or inching, and thus different notification can be performed.

[Operation and Effect] In short, since the present invention is configured as described above, it is determined whether the input value from the signal input member, the self-diagnosis of the control unit itself, and the output value to the signal output member are normal. In checking, the check mode group to be checked is selected based on the connection state of the external terminal connected to the control unit, and only the selected one is checked.

As a result, there is no need for a long check time as in the case of checking everything automatically, and the check time can be shortened, while the input value from the signal input member or the output value to the signal output member is reduced. In this check, the check by the control unit check mode group is performed in advance to confirm that the check is normal, so that a reliable check can be made, and each individual item that requires a check must be selected and operated. It is possible to prevent the user from forgetting to make a selection because the selection operation is troublesome and complicated like the one that must be done.

Moreover, when the check mode group of the input value from the signal input member is selected, the signal input member determines whether or not there is a change in the input signal based on the operation of the corresponding signal input member, and a reference change signal. A reference value check is made as to whether or not the input signal from the signal input member set to the state is within a preset reference value range, whereby the input signal corresponding to the operation of the signal input member is provided. Check whether the change of the input signal is based on the reference value.If it is not based on the reference value, the sensor and the setter are set to the reference value. Since it can be adjusted to be based on the above, the reliability of the check of the signal input member, which is particularly important in the field work, becomes high.

[Brief description of drawings]

The drawings show one embodiment of the check device in the field working machine according to the present invention. Fig. 1 is an overall side view of an agricultural tractor, Fig. 2 is a plan view of the same as above, and Fig. 3 is a control section. FIG. 4 is a perspective view, FIG. 4 is a plan view of the control operation unit, FIG. 5 is a front view of the control panel, FIG. 6 is a vertical sectional view of the control operation unit, and FIG.
A, B, C are the plan view, side view, vertical cross-sectional view, and
FIG. 8 is a side view of the main part of the hydraulic case, FIG. 9 is a rear view of the same part as above, FIG. 10 is a plan view of the main part of the lifting link mechanism, and FIG. 11 is a side view of the main part of the working part. Figure is a block diagram of the control mechanism, Figure 13 is a flow chart of the control procedure, and Figures 14A and B.
Is a perspective view of the cord checker, a mounting state diagram,
15 FIGS. A and B are a perspective view and a mounting state view of the display, respectively. In the figure, 1 is a traveling machine body, 13 is a position lever, 19 is a control unit, 20 is an input coupler, 21 is an output coupler, 24 is an input check mode switching plug, and 48 is an alarm.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Tobita 667 Isuya-cho, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd. (56) References: 60-609 (JP, U) Actual Kai 60-166014 (JP, U)

Claims (1)

(57) [Claims] 1. A control unit incorporating a microcomputer for outputting a corresponding control command based on an input signal from a signal input member such as a switch or a sensor to a signal output member such as a display. In the field work machine, the control unit is divided into respective check mode groups for executing the check of the input signal from the signal input member, the self-diagnosis check of the control unit itself, and the check of the output signal to the signal output member. The check mode for the check mode group selected from among these check mode groups, the control unit is connected to a plurality of external terminals connected to the control unit. And a check mode group selection means for determining which one of the check mode groups has been selected based on The check mode group of the signal input member of the check mode group includes a signal change check means for determining whether or not there is a change in the input signal based on the operation of the corresponding signal input member, and the signal input member set to the reference state. And a reference value check means for checking whether or not the input signal of is within a preset reference value range, and a check device for a field work machine.