JPH06221875A - Rotation display device - Google Patents

Abstract

PURPOSE:To provide a rotation display device with which problem of erroneous setting due to user's misunderstanding can be solved, by automatically or manually setting, for display, only the rotational rate setting display part that corresponds to a tool connected to a work rotational drive shaft of a work vehicle. CONSTITUTION:A tool detector 3 detects the kind of tools connected to a drive shaft, and outputs the signal representing the tool, and on a bar display part of a display 6, rotation rate of a work vehicle is displayed. Further, based on the signal sent from the detector 3, a rotational rate setting display part corresponding to the tool connected to the work rotational drive shaft is illuminanted for display on the display 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary display device for displaying the number of rotations of a work vehicle such as a tractor having a work rotary drive shaft by an analog bar display.

[0002]

2. Description of the Related Art Conventionally, a pointer-type tachometer is usually used for a rotation display device for displaying the rotation speed of an internal combustion engine of a work vehicle such as a tractor. Further, the tractor or the like is provided with a work rotary drive shaft in addition to the wheel drive system, and it is desirable that the work rotary drive shaft be used at a rotational speed at which a predetermined rotational torque is obtained. The tachometer is printed with a rotation speed set point mark for the working rotary drive shaft at a specific rotation speed position on the scale plate.
I used it as a mark when using it.

[0003]

However, since the rotational speed set point mark is simply printed, for example,
Multiple types of work implements are selectively connected to the drive shaft of the work vehicle, and setting marks are provided at two or more rotation speed positions in order to perform work at different rotation speeds by switching the transmission. In that case, the user may be confused as to which mark the rotational speed should be adjusted to, and there is a problem that the rotational speed is adjusted to the wrong mark.

The present invention has been made in view of the above points, and automatically or only the rotation speed setting display section corresponding to the work implement connected to the work rotary drive shaft of the work vehicle. It is an object of the present invention to provide a rotation display device which can be displayed by being artificially set and which can eliminate the setting error due to the user's misrecognition.

[0005]

In order to achieve the above object, the rotation display device of the present invention, as shown in the configuration diagram of FIG. 9, shows the rotation speed of a work vehicle equipped with a work rotation drive shaft. In a rotation display device for displaying, a tool detector that detects the types of work tools connected to a work rotation drive shaft and outputs a signal indicating the work tool, and a bar display unit that displays the number of revolutions In the vicinity of, a display unit provided with a plurality of rotation speed setting display section showing the rotation speed setting point corresponding to the work implement,
Display control means for illuminating and displaying a rotation speed setting display section corresponding to an instrument connected to the work rotary drive shaft based on a signal sent from the instrument detector.

[0006]

[Operation / Effect] In the rotation display device thus configured, the instrument detector detects the types of the plurality of types of work instruments connected to the work rotation drive shaft and outputs a signal indicating the work instrument. Then, the bar display portion of the display device displays the rotation speed of the work vehicle, and the display control means is an instrument connected to the work rotation drive shaft based on the signal sent from the instrument detector. The rotation speed setting display section corresponding to is displayed on the display.

As described above, the rotation number setting display portion of the display is selectively turned on and displayed according to the work implement connected to the work rotation drive shaft, and the user displays the turned on rotation number setting display portion. By visually recognizing, it is possible to easily and error-free match the engine speed to the set engine speed suitable for the instrument connected to the drive shaft.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a rotary display device used in a work vehicle such as a tractor. This device is configured with a so-called one-chip type CPU 4 as a main part, and in the CPU 4, a rotational speed calculation display process described later,
Alternatively, it includes a ROM in which program data for executing the rotation speed setting display section lighting process is stored in advance, a RAM of a writable / readable memory at any time, and an input / output circuit.

Reference numeral 1 denotes a rotation sensor for detecting the rotation speed of an internal combustion engine of a work vehicle, which outputs a pulse signal (rotation speed signal) having a frequency corresponding to the rotation speed, and an interface 2
1 to CPU4. 3 is an instrument detector for detecting a working instrument that is connected and used. When the working instrument is connected to a working drive shaft provided in a working vehicle and is used, depending on the connected instrument. The signals P1 and P2 are sent to the CPU 4 via the interface 22.

The instrument detector 3 is constituted by, for example, a switch which is automatically turned on / off by the instrument when the working instrument is connected. For example, when the first instrument is connected, the signal P1 is set to a low level "0". , The signal P2 is set to a high level "1", and when the second device is connected, the signal P1
Is set to a high level "1" and the signal P2 is set to a low level "0", and the signal is transmitted.

Reference numeral 6 is a display equipped with a bar display unit for displaying the engine speed by analog bar display. As shown in FIG. 2, the bar is a fluorescent display tube or LCD and is provided with a large number of segments S1. It is formed by being divided into S20.
Each segment S1 to S20 indicates, for example, 200 rpm, and each segment lights up in order from the left according to the number of revolutions,
For example, at 1400 rpm, seven segments are lit and displayed.

Further, on the display unit 6, a rotation speed setting display portion PT1 for indicating a setting rotation speed when the first device is connected is arranged on the bar display portion on the segment S9, Also, a rotation speed setting display portion PT2 for indicating the set rotation speed when the second device is connected is arranged on the segment S12, and is selectively lit and displayed depending on the connection state of the first and second devices. It Reference numeral 5 is a display drive circuit that drives and controls the display device 6 according to a command from the CPU 4, and reference numeral 7 in FIG. 2 is a red zone display portion.

Next, the operation of the rotary display device will be described with reference to FIGS.
This will be described with reference to the flowchart in FIG.

When the rotation signal (pulse signal) from the rotation sensor 1 is input, the CPU 4 enters an interrupt process as shown in FIG. 4, and first, at step 201, 1 is added to the input pulse signal number Ni, In step 202, it is determined whether the pulse number Ni has become 2. If the number of pulses is 1, this process is skipped.

When the rotation speed signal is input again and the pulse count Ni becomes 2 after step 201,
Next, the routine proceeds to step 203, where the value of the pulse number is cleared to zero, and then, at step 204, the flag FK indicating the completion of the rotation time measurement is set to 1. And step 20
At 5, the time TK for two pulses of the rotation signal is measured, the time data TK is stored, and this interrupt processing is skipped.

On the other hand, in the main routine (FIG. 3) of the CPU 4, first, in step 102, it is determined whether or not the flag FK indicating the completion of the rotation time measurement is 1, and if the flag FK is 1, the process proceeds to step 111. If the flag FK is 0 and the rotation time measurement has not been completed, the process proceeds to step 103.

In step 103, the sampling time T of the port for inputting the signals P1 and P2 from the instrument detector 3
s is 0.1 second, it is determined whether the time Ts is 0.
If it is not 1 second, go back to step 102,
On the other hand, when the time Ts reaches 0.1 seconds, step 10
4, the signals P1 and P2 sent from the instrument detector 3 are read.

Next, in step 105, the CPU 4 determines whether or not the signal P1 from the instrument detector 3 is "0", and when the signal P1 is "0" (the first instrument is connected to the drive shaft). Then, the process proceeds to step 106, and the flag FP1 indicating the connected state of the device is set to 1. On the other hand, the signal P
When 1 is not “0”, the process proceeds to step 107,
The flag FP1 is reset to 0.

Further, in step 108, the instrument detector 3
From the signal P2 is "0", and when the signal P2 is "0" (when the second instrument is connected to the drive shaft), the process proceeds to step 109, and the second instrument The flag FP2 indicating the concatenation of is set to 1. On the other hand, the signal P2
Is not "0", the routine proceeds to step 110, where the flag FP2 is reset to 0.

Then, the process returns to step 102 again, and the above-described processing is executed again. When the rotation time measurement is completed and the flag FK is determined to be 1 in step 102, the process proceeds to step 111, and the flag FK is executed. After being reset to "0", in step 112, the rotation speed N is calculated from the rotation time data TK measured in the interrupt processing.
In step 113, the bar display data of the display 6 is determined from the rotation speed N.

Next, the CPU 4 determines in step 114 whether or not the flag FP1 indicating the connection of the first device is "1", and if the flag FP1 is "1", then proceeds to step 115. Proceeding, the rotation speed setting display portion PT1 of the display 6 is lit up and displayed, and the bar display portion for displaying the rotation speed,
The segments S1 to Sn corresponding to the number of revolutions N are lit and displayed in order from the left.

On the other hand, if it is determined in step 114 that the flag FP1 is not "1", then the process proceeds to step 116, in which it is determined whether the flag FP2 indicating the connection of the second device is "1". If the flag FP2 is "1", the process proceeds to step 117, in which the rotation speed setting display portion PT2 of the display 6 is lit and displayed, and the bar display portion for displaying the rotation speed indicates the rotation speed N. A number of segments S1 to Sn are lit up and displayed in order from the left.

On the other hand, when it is determined in step 116 that the flag FP2 is not "1", the process proceeds to step 118, and only the rotation speed is displayed on the bar display portion. After that, returning to step 102, the same processing as described above is repeatedly executed, and the number of rotations N and the number of rotations setting display portion PT1 or PT2 are lit and displayed on the display device 6.

In this way, the indicator 6 indicates the engine speed N
Is displayed on the bar display unit, and when the first device or the second device is connected to the rotary drive shaft of the work vehicle, the rotation speed setting display unit PT1 or PT2 of the display 6 is displayed according to the device. Is selectively lit and displayed, and the user can visually check the illuminated display of the rotation speed setting display unit and set the rotation speed of the engine to the set rotation speed suitable for the device connected to the drive shaft easily and without error. Can be combined.

5 to 8 show an embodiment of the related invention, and FIG. 5 shows a block diagram of the rotary display device.

This device is a so-called one-chip type CP.
U14 is a main part, and the CPU 14 stores in advance program data for executing a rotation speed calculation display process or a rotation speed setting display unit lighting process, which will be described later.
An OM, a RAM that can be written and read as needed, and an input / output circuit are incorporated.

Reference numeral 11 denotes a rotation sensor for detecting the rotation speed of the internal combustion engine of the work vehicle, which outputs a pulse signal (rotation speed signal) having a frequency corresponding to the rotation speed and sends it to the CPU 14 via the interface 12.

Reference numeral 16 is a display equipped with a bar display section for displaying the engine speed by an analog bar display.
As shown in FIG. 6, the bar is divided into a large number of segments S1 to S20 by a fluorescent display tube or LCD. Each segment S1 to S20 is, for example, 200 rpm
Each segment lights up in order from the left according to the number of rotations. For example, in the case of 1400 rpm, seven segments light up and are displayed.

Further, on the display unit 16, a rotation speed setting display unit for indicating a set rotation speed (for example, 2300 ± 50 rpm) when the working implement is connected to the working rotation drive shaft is provided on the bar display unit. PT is arranged on the segment S12.

By the way, the segment S12 of the bar display section
Is a portion indicating the rotation speed of 2200 rpm to 2400 rpm, it is not accurate to determine whether the engine rotation speed has reached the set rotation speed of 2300 ± 50 rpm by lighting the segment S12. Therefore, in order to accurately display whether or not the engine speed has reached the set speed, as will be described later, the engine speed is set to the set speed (for example, 230
0 ± 50 rpm), the rotation speed setting display section PT
Is designed to blink.

Reference numeral 15 is a display drive circuit for driving and controlling the display 16 in accordance with a command from the CPU 14, and 17 in FIG. 6 is a red zone display section.

Next, the operation of the above rotary display device will be described with reference to FIG.
This will be described with reference to the flowchart of FIG.

When the rotation signal (pulse signal) from the rotation sensor 11 is input, the CPU 14 enters an interrupt process as shown in FIG. 7, and first, at step 401, 1 is added to the input pulse signal number Ni, In step 402, it is determined whether the pulse number Ni has become 2. If the number of pulses is 1, this process is skipped.

Then, when the rotation speed signal is input again and the number of pulses Ni becomes 2 through the above step 401,
Next, proceeding to step 403, the value of the number of pulses is cleared to zero, and then at step 404, the flag FK indicating the completion of rotation time measurement is set to 1. And step 40
At 5, the time TK for two pulses of the rotation signal is measured, the time data TK is stored, and this interrupt processing is skipped.

On the other hand, in the main routine (FIG. 8) of the CPU 14, first, in step 302, it is determined whether or not the flag FK indicating the completion of the rotation time measurement is "1". Proceed to 303, flag F
When K is “0” and the rotation time measurement is not completed, the process proceeds to step 310.

In step 303, the flag FK is set to "0".
After resetting to, in step 304, the rotation speed N is calculated from the rotation time data TK measured in the interrupt processing. Next, in step 305, the rotation speed N is the set rotation speed N when the work implement is connected to the work rotation drive shaft.
It is determined whether or not it is within the range of d to Nu (for example, 2300 ± 50 rpm), and when the rotation speed N is within the range of the set rotation speed Nd to Nu, the process proceeds to step 306, and the rotation speed setting display portion PT. The flag FP for blinking is set to "1". On the other hand, when the rotation speed N is outside the set rotation speeds Nd to Nu, the routine proceeds to step 307, where the flag FP is reset to "0".

The CPU 14 then proceeds to step 308.
In step 309, the bar display data of the display device 16 is determined from the rotation speed N, and the rotation speed setting display portion PT of the display device 16 is displayed in accordance with the lighting data PTD and the bar for displaying the rotation speed is displayed. The segments S1 to Sn corresponding to the rotation speed N are lit up and displayed on the display unit in order from the left.

After that, the process returns to step 302 again and the same process as described above is executed. When the flag FK is set to "1" again due to the completion of the rotation time measurement, the rotation number N is calculated again and the display is performed.

On the other hand, if the flag FK has been reset to "0", then proceed to step 310, and whether the value Ts of the counter for counting the blinking time has reached the set value (for example, 0.4 seconds). If it is determined that the set time Ts is not reached, the process returns to step 302 and the same process as above is performed.

Value Ts of the counter for counting the blinking time
Is set to a set value (for example, 0.4 seconds), the process then proceeds to step 311, and the flag FP indicating blinking is "1".
If the flag FP is not "1", the process proceeds to step 314, and the lighting data PTD for lighting the rotation speed setting display portion PT of the display 16 is "1". Set to.

If the flag FP is set to "1" in step 311, then the process proceeds to step 312.
It is determined whether the lighting data PTD is "1". If the lighting data PTD is not "1", the process proceeds to step 314, and the lighting data PTD is set to "1". On the other hand, if the lighting data PTD is “1” in step 312, the process proceeds to step 313, and the lighting data PTD is set to “0”.

By repeating the operations of steps 302 to 314, the number of segments S corresponding to the number of rotations N is displayed on the bar display section for displaying the number of rotations of the display 16.
1 to Sn are displayed in turn from the left and the number of revolutions N
When the number of rotations reaches the set number of rotations Nd to Nu (for example, 2300 ± 50 rpm) when the work implement is connected to the work rotation drive shaft, the number-of-revolutions setting display part PT blinks at a cycle of 0.8 seconds. .

Therefore, by seeing the blinking of the rotation speed setting display portion PT, the user can set the engine rotation speed even if the rotation speed width of the segment of the bar display portion is as wide as 200 rpm. Nd to Nu (for example, 23
It is possible to accurately visually confirm that the rotation speed has become 00 ± 50 rpm), and it is possible to accurately match the rotation speed N when the work implement is connected to the work rotation drive shaft to the set rotation speed. Further, in this case, it is not necessary to increase the number of segments of the display in order to improve the resolution of the rotation speed display.

[Brief description of drawings]

FIG. 1 is a block diagram of a rotation display device according to an embodiment of the present invention.

FIG. 2 is a front view of a display device 6.

FIG. 3 is a flowchart showing a display process of the device.

FIG. 4 is a flowchart showing the interrupt processing.

FIG. 5 is a block diagram of a rotation display device showing an embodiment of a related invention.

6 is a front view of the display unit 16. FIG.

FIG. 7 is a flowchart showing interrupt processing of the device.

FIG. 8 is a flowchart showing a display process of the device.

FIG. 9 is a configuration diagram of the present invention.

[Explanation of symbols]

1-rotation sensor, 3-apparatus detector, 4-CPU, 6-display, PT1, PT2-rotation speed setting display section.

Claims (2)

[Claims] 1. A rotation display device for displaying the number of rotations of a work vehicle having a work rotation drive shaft, wherein the work is detected by detecting the types of a plurality of work implements connected to the work rotation drive shaft. A tool detector for outputting a signal indicating a tool, and a display provided with a plurality of rotation speed setting display portions indicating rotation speed set points corresponding to the working equipment in the vicinity of a bar display portion displaying the rotation speed. And a display control means for illuminating and displaying the number-of-rotations setting display section corresponding to the instrument connected to the working rotary drive shaft based on a signal sent from the instrument detector. Characteristic rotating display device. 2. A rotation display device for displaying the rotation speed of a work vehicle having a work rotation drive shaft, wherein a work connected to the work rotation drive shaft near a bar display section for displaying the rotation speed. Based on a signal sent from the rotation sensor for detecting the rotation speed of the working vehicle, a display provided with a rotation speed setting display section for indicating the rotation speed set point corresponding to the appliance, and the working vehicle based on the signal sent from the rotation sensor. Determination means for determining whether or not the rotation speed falls within the range of the rotation speed setting point, and when the determination means determines that the rotation speed falls within the range of the rotation speed setting point, A rotating display device, comprising: a display control unit for displaying a blinking display.