JP2005024320A - Signal discrimination method of display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately perform the operation of altering and adjusting setting values in a signal discrimination method of a display device constituted in such a way as to display the state of setting on the basis of signal values acquired by digitizing an altered and adjusted setting values when a setting device for altering and adjusting setting values of a control system is artificially adjusted and operated. <P>SOLUTION: A display is changed over on the basis of the results of discrimination of the contrast of the digitized signal values to dead zones. A dead zone in the direction in which the signal values are altered is set small, and a dead zone in the opposite direction is set large to determine alterations in the signal values. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal discrimination method for a display device used in various working machines such as agricultural tractors and various control devices.
[0002]
[Prior art]
Agricultural tractor, which is an example of a work machine, has control means for changing the position or posture of a work device such as a rotary tiller mounted on the self-propelled tractor and can switch and display the operation status of multiple items. A device having a display device is known (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-356164
[Problems to be solved by the invention]
As a display device capable of performing various displays, a liquid crystal display device is used. In order to perform display processing using a microcomputer, the voltage of a sensor or a setting device is digitally converted and handled as an integer value. In this case, it is inconvenient for the control system that the digital signal value fluctuates due to the influence of minute noise or the like. For this reason, averaging processing and dead band processing are introduced.
[0005]
When the averaging process and the dead band process are introduced, adverse effects on the control system can be avoided, but problems such as a decrease in response of the control system and an increase in response time tend to occur.
[0006]
For example, when the set value is displayed in a bar graph, etc., if the dead zone is set large, the display can be prevented from changing even if the digital signal value fluctuates due to the influence of noise or the like. When the set value is gradually changed and adjusted while visually checking the value, the response to change in the bar graph becomes slow due to the large dead zone, and if the set value indicated by the bar graph is operated until it reaches the desired value, The display of the set value exceeding the desired set value in the adjustment direction may appear, and it is necessary to perform an adjustment operation in anticipation of the delay of the display, which is difficult for an inexperienced operator. It becomes.
[0007]
The present invention has been made paying attention to such points, and it is a main object of the present invention to make it possible to easily and accurately perform a setting value change adjustment operation.
[0008]
[Means for Solving the Problems]
[Configuration, operation, and effect of the first invention]
[0009]
According to a first aspect of the present invention, when a setting device for changing and adjusting a setting value of a control system is artificially adjusted, the setting state is displayed based on a digitized signal value of the changed and adjusted setting value. A method for determining a signal of a display device,
The display is switched based on the discrimination result obtained by comparing the digitized signal value with the dead band, the dead band in the direction in which the signal value changes is set small, and the dead band in the reverse direction is set large to change the signal value. It is characterized by judging.
[0010]
According to this, when the digitized signal value is adjusted to increase, for example, the dead zone in the direction in which the signal value increases is small, so even if the amount of change in the signal value is small, the dead zone is exceeded and the change is detected immediately. As a result, the display is changed. Here, even if the signal value is inadvertently changed in a decreasing direction due to noise or a change in the operating force applied to the setting device, the dead zone in this direction is large, so the signal value is changed. The current display state is maintained.
[0011]
Therefore, according to the first invention, when operating the setting device, the setting state can be displayed with little response delay, and the overall dead band width in the direction in which the setting value is changed and in the opposite direction is The necessary width can be secured to stabilize the display state, and the setting value change adjustment operation can be performed easily and accurately.
[0012]
[Configuration, Action, and Effect of Second Invention]
[0013]
According to a second aspect of the present invention, in the first aspect of the present invention, a priority display mode is set in which the display of the setting state when the setting device is adjusted is interrupted to the standard display in the standard display mode for performing predetermined display In the standard display mode, the priority display mode is executed when the signal value exceeds a dead zone.
[0014]
According to this, normally, the display device performs display in the standard display mode. However, when the setting device is operated to change and adjust the target setting of the control system, the setting state is displayed with priority over the standard display.
In addition, as described above, the display of the target set value responds sensitively to changes in the signal value in the adjustment direction, and is insensitive to changes in the signal value in the direction opposite to the adjustment direction.
[0015]
Therefore, according to the second invention, it is possible to perform normal standard display using a common display part and priority display only when the control system setting change operation is performed. Can be easily confirmed visually.
Moreover, when changing the setting of the control system by operating the setting device, the setting state can be displayed with little response delay, and the overall dead band width in the direction in which the setting value is changed and in the opposite direction. Can secure the necessary width and stabilize the display state, and can easily and accurately perform the adjustment operation of the set value.
[0016]
[Configuration, operation, and effect of the third invention]
[0017]
According to a third invention, in the second invention, the standard display mode switches and displays the operation status of a plurality of items in the work implement main body, and the priority display mode is connected to the work implement main body so that the position and orientation can be changed. The target setting position or setting posture of the working device is displayed.
[0018]
According to this, normally, the display device displays the operation status of a plurality of items related to the work implement main body, for example, to switch and display the remaining amount of fuel, the temperature of the engine cooling water, the accumulated operating time, the traveling speed, and the like. It is possible to visually recognize the operating state of the work implement body while driving. In addition, when the setting device is operated to change and adjust the target position setting of the working device, such as the height position of the working device, the setting state of the item to be adjusted is displayed with priority over the standard display.
In addition, as described above, the display of the target set value responds sensitively to changes in the signal value in the adjustment direction, and is insensitive to changes in the signal value in the direction opposite to the adjustment direction.
[0019]
Therefore, according to the third aspect of the invention, it is possible to preferentially display the setting state when the control system setting change operation is performed, usually at the display location where the operation status of the plurality of items related to the work implement main body is switched and displayed. Various visual confirmations can be easily performed by concentrating the display locations.
Moreover, when operating the setter, the setting status can be displayed with little response delay, and the overall deadband width in the direction in which the setting value is changed and in the opposite direction ensures the necessary width. The display state can be stabilized, and the setting value change adjustment operation can be performed easily and accurately.
[0020]
[Configuration, Action, and Effect of Fourth Invention]
[0021]
4th invention is 2nd or 3rd invention,
The priority display mode is maintained until a set time elapses after the artificial adjustment operation of the setting device is completed, and the original standard display mode is restored after the set time elapses.
[0022]
According to this, if the target setting of the position or orientation of the work device is changed and adjusted, the setting state of the adjustment target is automatically displayed on the front display device from that point, and the set time after the adjustment is completed Since the display remains, it is effective for checking after adjustment. Further, it is not necessary to switch the display mode of the display device to the original standard display, which contributes to improvement in handling.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an entire rotary cultivating agricultural tractor as an example of a working machine equipped with a display device, and FIG. 2 shows a rear portion thereof. This agricultural tractor has a structure in which a rotary tiller 2 is connected via a three-point link mechanism 3 to a rear portion of a tractor main unit 1 configured for four-wheel drive so as to be movable up and down and rolled. Here, the three-point link mechanism 3 includes a top link 3a and a pair of left and right lower links 3b. The left and right lift arms 5 driven by a lift cylinder 4 formed of a single-acting hydraulic cylinder and the left and right lower links. 3b is connected via a lift rod 6 and a rolling cylinder 7, respectively.
[0024]
This agricultural tractor is provided with a function of controlling the work position and orientation of the rotary tiller 2, and a control block for executing these controls is shown in FIG.
[0025]
As control elements of the control function for controlling the working position and orientation of the rotary tiller 2, there are a lifting control system for moving the rotary tiller 2 up and down by the lift cylinder 4, and a rolling control system for tilting the rotary tiller 2 right and left by the rolling cylinder 7. Furthermore, the elevation control system includes a position control system for raising and lowering the rotary tiller 2 to an arbitrary height set by the driver, and raising and lowering the rotary tiller 2 based on the tilling depth detection result. Includes an automatic tilling control system that stably maintains the depth at the set tilling depth, and a priority lifting control system that can arbitrarily lift and lower the rotary tiller 2 in preference to the position control system and the automatic tilling control system. Yes. In addition, the rolling control system includes a standard rolling control system that maintains the rotary tiller 2 at a horizontal tilt angle that is set regardless of the horizontal tilt of the machine 1 in a flat field, and a rotary tiller 2 in a tilted field. And an inclined ground rolling control system for maintaining the left and right inclination angles. The electromagnetic control valve 11 that controls the operation of the lift cylinder 4 and the electromagnetic control valve 12 that controls the operation of the rolling cylinder 7 are connected to a control device 10 using a microcomputer. An outline of each control system for operating the control valve 11 and the electromagnetic control valve 12 for rolling will be described.
[0026]
[Position control system]
As an input device for the position control system, a potentiometer-based position setter 15 in which a target height is set based on an operation of a hydraulic lever 14 for lifting operation provided on the right side of the driver's seat 13, and a lift A lift arm sensor 16 using a potentiometer that detects the height of the rotary tiller 2 from the swing angle of the arm 5 is connected to the control device 10, and a set value from the position setter 15 and a detection from the lift arm sensor 16. The lift tiller 4 is controlled to expand and contract via the lifting / lowering electromagnetic control valve 11 so that the value is balanced, so that the rotary tiller 2 is moved up and down to a position corresponding to the operation position of the hydraulic lever 14 and moved to that position. Can be held in.
[0027]
[Automatic tilling control system]
As an input device of this automatic tilling control system, a dial type tilling depth setting device (adjustment operation mechanism) 17 using a rotary potentiometer for setting a target tilling depth, and a swing displacement amount of a rear cover 18 in the rotary tilling device 2 A cover sensor 19 using a rotary potentiometer that detects the actual tilling depth is connected to the control device 10, and the tilling depth setting value from the tilling depth setting unit 17 and the tilling depth detection signal from the cover sensor 19 are balanced. In this way, by performing expansion / contraction control of the lift cylinder 4 via the electromagnetic control valve 11 for raising / lowering, rotary tilling at a predetermined tilling depth set regardless of the forward / backward inclination of the machine 1 or the state of subsidence to the field is performed. be able to. The plowing depth setting device 17 is incorporated in an operation panel 20 provided on the right side of the driver's seat 13.
[0028]
[Priority lift control system]
As an input device of the priority lift control system, a priority lift switch 23 operated by a priority lift lever 22 provided on the right side of the steering handle 21 is connected to the control device 10. This priority lift lever 22 is configured as a lever that can swing up and down and is biased to return to neutral. With one-shot operation upward, the rotary tiller 2 rises to the upper limit in preference to the selected lift control system. Then, the descent control is performed to the target plowing depth set by the elevating control system in which the rotary tiller 2 is selected by the one-shot swing operation downward.
[0029]
[Rolling control system]
As an input device of the rolling control system, a tilt detection mechanism 25 that detects the left / right tilt angle of the tractor main unit 1 using a gravity tilt sensor or an angular velocity sensor, and a target tilt angle in the left / right direction of the rotary tiller 2 A tilt setting device (adjustment operation mechanism) 26 using a potentiometer set to (for example, left and right horizontal) and a stroke sensor 27 for detecting the length of the rolling cylinder 7 are connected to the control device 10. According to this rolling control system, when the machine 1 is tilted to the left or right, based on the detection value of the tilt detection mechanism 25, the tilt of the rotary tiller 2 accompanying the machine tilt is corrected to the target tilt angle. The target cylinder length is calculated, and the rolling cylinder 7 is expanded and contracted via the electromagnetic control valve 12 so as to match the target length, so that the tilt angle of the rotary tiller 2 is stably maintained at the target tilt angle. It is. The tilt setting device 24 is also incorporated in the operation panel 20.
[0030]
Further, a front panel 30 is provided in front of the driver's seat 13, and a tachometer 31 for displaying the engine speed is provided in the center of the front panel 30, and various monitor lamps 32 are provided on the left and right sides thereof. In addition, a liquid crystal display device 33 formed horizontally is disposed above the tachometer 31.
[0031]
The display device 33 can switch and display a plurality of items related to the tractor main unit 1 and enters a standard display mode when the main switch (key switch) is turned on. The temperature is displayed as a bar graph, and the hour meter, working time, and traveling speed are sequentially switched and displayed by pressing the display switching switch 34 (see FIG. 6).
[0032]
Further, when the main switch is operated to the engine start position, the PTO lever 36 for shifting the PT0 transmission mechanism provided in the transmission system to the PT0 shaft 35 at the rear end of the machine body is in the shift position deviated from the neutral position. When the shuttle lever 37 for forward / reverse switching disposed on the left side of the steering handle 21 is out of neutral, the display on the display device 33 is automatically switched so as to prompt the user to operate these neutrally. (See FIG. 7).
[0033]
Further, if the seat belt is not attached after the engine is started, the display on the display device 33 is automatically switched to prompt the attachment, and the positions of the hydraulic lever 14 and the lift arm 5 are shifted so that the position control is performed. When it is out of the equilibrium state, display on the display device 33 is performed so as to prompt the user to return it to the equilibrium state (see FIG. 8).
[0034]
In addition, when the traveling speed becomes equal to or higher than a predetermined speed while traveling on the road, if the pair of side brake pedals 38 for independently braking the left and right rear wheels 9 are not coupled, a display prompting the coupling operation is displayed. In addition, when the PTO lever 36 is in the shift position, a display prompting an operation to return it to the neutral position is displayed (see FIG. 9).
[0035]
In addition, when an abnormality occurs during running or work, the alarm mode is switched to, and when the remaining fuel level falls below a predetermined amount, a message prompting fuel replenishment is displayed. If there is an abnormality in the charging system or engine lubrication system, an abnormality occurs. When the coolant temperature rises abnormally to the set temperature, the occurrence of overheating is displayed, and a display prompting an operation to drop the engine speed to idling is displayed (see FIG. 10).
[0036]
In addition to executing the above-described standard display, the display device 33 is configured to preferentially execute the following display when adjusting the target plowing depth in the automatic plowing depth control in the plowing work state. Here, whether or not it is in a plowing work state is whether the traveling speed is set to a plowing work speed, the lift arm 5 is lowered to a plowing work level, and the PTO shaft 35 is driven. It has come to be recognized.
[0037]
When the plowing depth setting device 17 is operated to adjust the target plowing depth in the automatic plowing depth control in a state where it is recognized that it is in the plowing work state according to the above conditions, the display is performed from the time when the plowing depth setting device 17 is operated The device 33 is switched from the standard display mode to the priority display mode, and the target working depth D at that time is displayed as a bar graph with a specification for changing the number of blocks arranged in series as shown in FIG. And even if the operation of the plowing depth setting device 17 is finished, the display is maintained for a predetermined time (for example, several seconds) from the end of the operation, and then automatically returns to the original standard display mode (see FIG. 12 flow chart).
[0038]
Here, the determination as to whether or not to interrupt the priority display mode during the standard display mode is made by digital signal processing as follows. That is, the analog signal (voltage value) output from the tilling depth setting device 17 composed of a rotary potentiometer is converted into a digital signal. If the change amount of the digital signal is within the dead zone, the tilling depth setting device 17 is adjusted. If it is determined that there is no change, the standard display mode is continued, and if the change amount of the digital signal exceeds the dead zone, it is determined that the tilling depth setting unit 17 has been adjusted and the priority display mode is interrupted.
[0039]
In this case, the dead zone used for the determination is not always maintained at a constant value, but is changed depending on the display mode. For example, if the digital signal for the current setting value in the tilling depth setting unit 17 in the state in which the standard display mode is being executed is N, the dead zone at this time is (+1) in the signal increasing direction and the signal decreasing direction. Is set to (-1), and even if the change amount of the digital signal fluctuates (1) in the forward or reverse direction due to the influence of disturbance or the like, it is determined to be in the dead zone and the standard display mode is continued.
In addition, when the digital signal value is gradually changed and adjusted from 80 to 90, for example, when the digital signal increases by 2 from the original signal value 80 to 82, the amount of change (+2) changes to the dead zone (+1). Therefore, the priority display mode interrupt is started, and at the same time, the dead zone is set to (+0) in the signal increasing direction and (-1) in the signal decreasing direction. Accordingly, it is determined that all changes in the digital signal value that is being increased and exceeded the dead zone (+1), and the interruption in the priority display mode is continued. During this time, even if the digital signal fluctuates (1) due to the influence of disturbance or the like, for example, even if the signal value decreases from 90 to 1 to 89, this is regarded as being in the dead zone and is given priority. The display mode interrupt continues.
[0040]
In addition, when the set value is adjusted by the tilling depth setting unit 17 so as to decrease the set value, the dead zone automatic correction similar to the above is performed.
[0041]
[Another embodiment]
The present invention can also be implemented in the following forms.
[0042]
(1) As shown in FIG. 13, when the plowing depth setting unit 17 as an adjustment operation mechanism is operated, the target plowing depth D and the mark m indicating the current plowing depth are displayed side by side, and both are displayed. It is convenient to be able to compare the situation without having to look back.
[0043]
(2) The target inclination angle or the target inclination angle and the actual inclination angle are also preferentially displayed in a bar graph display or the like when the rolling control inclination angle setting device 26 which is another adjustment operation mechanism is operated. You can also.
[0044]
(3) In addition to the graph display, it can also be carried out with a specification that displays numerical values.
[Brief description of the drawings]
[Fig. 1] Overall side view of an agricultural tractor [Fig. 2] Perspective view of the rear of the fuselage [Fig. 3] Plan view of the rear of the fuselage [Fig. 4] Front view of the front panel [Fig. 5] Control block diagram [Fig. FIG. 7 is a front view showing a display example when the engine is started. FIG. 8 is a front view showing a display example after the engine is started. FIG. 9 is a front view showing a display example when the road is running. FIG. 10 is a front view showing a display example when an abnormality occurs. FIG. 11 is a front view showing a display example when the target working depth is changed and adjusted. FIG. 12 is a flowchart showing an outline of display control. ] Front view showing another display example when the target working depth is changed and adjusted [Explanation of symbols]
1 Work implement body 2 Work device (rotary tillage device)
33 Display device

Claims (4)

When the setting device that changes and adjusts the setting value of the control system is manually adjusted, the signal discrimination of the display device configured to display the setting state based on the digitized signal value of the changed and adjusted setting value A method,
The display is switched based on the discrimination result obtained by comparing the digitized signal value with the dead band, the dead band in the direction in which the signal value changes is set small, and the dead band in the reverse direction is set large to change the signal value. A signal discrimination method for a display device, characterized by: A signal discrimination method for a display device according to claim 1,
A priority display mode is set in which a display of a setting state when the setting device is adjusted is interrupted to a standard display in a standard display mode for performing a predetermined display, and the signal value has a dead band in the standard display mode. A signal discrimination method for a display device, characterized in that a priority display mode is executed when exceeding. A signal discrimination method for a display device according to claim 2,
The standard display mode is for switching and displaying the operation status of a plurality of items in the work implement main body, and the priority display mode is a target setting position or setting posture of a work device connected to the work implement main body so that the position and orientation can be changed. A method for determining a signal of a display device, comprising: A signal discrimination method for a display device according to claim 2 or 3,
The priority display mode is maintained until a set time elapses after the artificial adjustment operation of the setting device is completed, and the original standard display mode is restored after the set time elapses. Method.

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