JPH1016591A - Transmission control device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the transmission based on an operation tool even when the relationship of a setting instrument with the operation tool is not appropriate. SOLUTION: A control device 41 which controls a transmission motor 21 based on the feedback signal from a transmission sensor 22 so as to obtain the set speed at an auxiliary transmission setting instrument 34 to be operated by a dial for the transmission of an auxiliary transmission, is provided, and in a set signal correcting means H, the control device 41 is switched in an adjustable mode. When the voltage signal from the auxiliary transmission setting instrument 34 is in the range of the pre-determined voltage in a condition where the dial is set to the prescribed position in this adjustable mode, the voltage signal of the auxiliaary transmission setting instrument 34 is regarded as the reference signal which is predetermined corresponding to the set stage, and when the transmission is controlled, the target value corrected based on the reference signal is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a potentiometer type speed setting device which can be set in a plurality of stages via an operating tool, a speed change device for continuously changing the running speed of the body by an actuator, and a speed change device. A shift control device for a working machine, comprising: a feedback sensor for detecting a shift position of a device; and control means for driving an actuator until a shift position corresponding to a voltage signal from the speed setting device is detected by a signal from the feedback sensor. Regarding improvement.

[0002]

2. Description of the Related Art Conventionally, there is a working machine constructed as described above as disclosed in Japanese Patent Application Laid-Open No. Hei 6-241306. In this conventional example, an input from a potentiometer type speed setting device operated by a lever is known. A control system is configured to drive the electric cylinder (actuator) to shift the belt-type continuously variable transmission so that the value matches the detection value from the stroke sensor that feeds back the operation amount of the shift operation system. .

[0003]

In the transmission system described in the prior art, since the speed change operation is performed electrically, a favorable aspect that the speed change operation can be performed lightly and smoothly as compared with the case where the speed change operation is performed artificially. It is provided with. However, when the electric control is performed in this way and attention is paid to the setting device, a potentiometer type setting device needs to show a shift state corresponding to the setting position of the operating tool for operating the setting device. At the time of assembling the speed change system, it is necessary to link the setting device and the operating tool in a predetermined relationship. However, in reality, it is difficult to perform the necessary linkage due to an assembly error or an individual difference of the potentiometer.

[0004] In order to solve this problem, an accommodating mechanism that enables fine adjustment of the mechanical linkage between the operating tool and the setting device is provided, or a voltage signal from the setting device is adjusted. May be interposed in the signal system of the setting device, but there is room for improvement because the number of parts increases and the cost increases, and the adjustment takes time and effort.

SUMMARY OF THE INVENTION An object of the present invention is to respond to an operating tool without special adjustment even when the relationship between the setting device and the operating tool of the shift control device for a working machine configured as described above is not appropriate. The point is that a shift control device capable of obtaining a shift state is rationally configured.

[0006]

According to a first feature of the present invention, as described at the outset, a speed setting device, a transmission, a feedback sensor, and a voltage signal from the speed setting device correspond to each other. And a control means for driving the actuator until the shift position is detected by a signal from the feedback sensor. The shift control device for a work machine, the shift control device being switchable to an adjustment mode for adjusting the speed setting system. With this configuration, when it is determined in this adjustment mode that the setting signal value from the speed setting device is within a predetermined range in a state where the operating tool is set to any of the plurality of stages, at the time of this determination, The speed setting device setting signal is regarded as a preset setting reference signal corresponding to the setting stage, and at the time of shift control, the setting signal corrected based on the setting reference signal is set. Located that it includes a setting signal correction means for obtaining a, the action is as follows.

A second feature of the present invention (claim 2) is that the setting signal correction means determines a value of a difference between a signal from a speed setting device and a preset reference signal in the adjustment mode. The correction value based on the difference is added to or subtracted from the signal from the speed setting device to obtain the corrected setting signal, and the operation is as follows.

[0008] A third feature of the present invention (claim 3) is that a forced ending means for terminating the adjustment mode when the necessary operation is not performed within a set time after switching to the adjustment mode. It has the following features.

[Action]

According to the first feature, by setting the operation device of the shift setting device to one of a plurality of stages while the shift control device is set to the adjustment mode, a setting signal from the shift setting device is set. If the setting signal correction means determines that the value is within the preset range, the setting signal correction means, even if there is a difference between the setting signal value and the value of the setting reference signal,
The shift control corresponding to the set position of the operating tool can be performed by performing a correction that regards the setting signal from the shift setting device as a reference signal, and obtaining a corrected setting signal during the shift control.

In other words, even when the shift setting device does not output a signal to be required when the operating tool is set at a predetermined position, as long as the signal does not greatly deviate from the value of the required signal (set in advance) Adjust the mechanical linkage between the controls and the gear set, or
The setting signal correction means automatically sets an appropriate corrected signal without performing an operation of adjusting the voltage signal from the shift setting device with a variable resistor or the like, thereby enabling a shift based on the shift setting device. It has become something.

According to the second feature, in the adjustment mode, the setting signal correction means sets a correction value based on a difference between a signal from the shift setting device and a setting reference signal, and sets the correction value from the shift setting device during shifting. Is added to or subtracted from this signal to obtain a corrected appropriate setting signal, thereby enabling a shift by the shift setting device. In other words, when the required signal cannot be obtained from the shift setting device when the operating tool is set at the predetermined position, the value of the voltage signal is shifted to a higher side or a lower side than the required voltage signal. By performing electrical processing such as performing addition and subtraction so as to eliminate the deviation, the setting signal from the shift setting device is converted into an appropriate setting signal to perform shift control. It is possible.

According to the third feature, if the required operation is not performed within the set time after switching to the adjustment mode, the forced ending means ends the adjustment mode. The adjustment mode is automatically terminated even if the operator forgot to exit the adjustment mode by making adjustments, so even if the shift setting device is operated after this termination, the setting signal correction It does not change the correction state of the means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a drive-type front wheel 1 and a drive-type rear wheel 2 that are steered.
A transmission system for arranging an engine 4, a transmission case 5, and an auxiliary transmission B in front of a traveling body 3 provided with a transmission system for transmitting the shifting power from the transmission case 5 to the front wheels 1; A transmission system for transmitting the power of the vehicle to the rear wheels 2 via the intermediate transmission shaft 6 and the rear axle case 7 is formed, and a driving seat 8 is disposed at a central portion of the traveling vehicle body 3, and a rear end of the traveling vehicle body 3 is provided. The seedling planting apparatus A can be moved up and down through a parallel quadruple link mechanism 10 driven up and down by a lift cylinder 9 and can be freely rolled around a longitudinal axis X to be used as an example of a working machine. Configure a rice transplanter of the type.

The seedling planting apparatus A is configured to cut out seedlings one by one from the lower end of the mat-shaped seedling W placed on the seedling placing stand 11 by the planting mechanism 12 and plant the seedlings in a field scene. And a plurality of leveling floats 13. The lift cylinder 9 is configured so that the piston rod is disposed obliquely downward and the seedling placement apparatus A is raised by contraction.

As shown in FIG. 2, the auxiliary transmission B has split pulleys 15 and 15 whose belt winding radius can be adjusted with respect to the output shaft 4A of the engine 4 and the input shaft 5A of the transmission case 5, respectively. In addition, a tension pulley 17 for winding the endless belt 16 to apply tension to the endless belt 16 is provided, and a link member 18 for adjusting a belt winding radius for each split pulley 15, 15 is provided.
Electric transmission motor 2 as an actuator for operating link member 18 via rod 19 and bell crank 20
1 is configured to be able to change the speed freely. In addition, the bell crank 20
, A potentiometer type shift sensor 22 is provided as a feedback sensor. The input shaft 5A of the transmission case 5 is provided with a friction type main clutch 23.

As shown in FIGS. 1 to 3, a steering handle 24 is arranged at a front position of the driver's seat 8.
A main transmission lever 25 for operating a gear transmission system in the transmission case 6 is disposed on the left side of the engine hood, and a forward / reverse switching device as a transmission disposed in the transmission case on the left side of a post portion of the steering handle 24. G
And a forcible raising / lowering lever 27 for forcibly controlling the raising and lowering of the seedling planting device A on the right side of the post portion. Also, a main clutch pedal 28 for operating the main clutch 23 is disposed on the left side of the step portion 3S of the traveling body 3, and left and right brakes (not shown) built in the rear axle case 7 are operated on the right side of step 3S. Then, brake pedals 29, 29 for independently braking the left and right rear wheels 2, 2 are arranged. Also, on the right side of the driver's seat 8, the raising and lowering control of the seedling planting device A and the built-in transmission case 5 are provided. A raising / lowering lever 30 for performing the on / off control of the planted clutch C is arranged.

As shown in FIGS. 3 and 4, the meter panel 32 has an accelerator lever 33 for setting the engine speed.
And the dial 34 for setting the gear position of the subtransmission B.
A, a potentiometer-type auxiliary shift setting device 34 as a speed setting device operated by A, a shift display device 35 for displaying the shift speed of the auxiliary transmission device B, and a display unit 3 for displaying states of various devices.
6 is provided.

The main transmission lever 25 is mechanically linked to a gear type transmission system inside the transmission case 5, and the low speed position L for planting the traveling body 3 and the high speed position H for traveling on the road. (See FIG. 2). As shown in FIG. 6, the forward / reverse lever 26 can be switched between a forward position F formed at a front end on a straight path passing through the neutral position N as a reference and a reverse position R formed at a rear end. The forward / reverse switching mechanism G is configured to perform a speed change operation without switching off the main clutch 23 during the switching operation. Further, the forward / reverse switching lever 26 is configured to be operable vertically in a forward position F and a reverse position R (a direction orthogonal to a linear operation path connecting the neutral position N and the reverse position R). Along with
The sub-transmission B is accelerated by a predetermined speed by returning to each position by a spring (not shown) and operating to a speed-up position IN set above each position. The auxiliary transmission B is configured to be decelerated by a predetermined speed by operating to a deceleration position DE set below (control operation will be described later).

As shown in FIG. 4, the dial 34A of the sub-shift setting device 34 is configured to be adjustable to seven shift positions 1 to 7 and to be held in a detent manner at each of the seven shift positions. The transmission display device 35 has seven light emitting diodes 35A... Arranged linearly, the hue of the two light emitting diodes 35A on the left end side is green, and the three
As the hue of the two light emitting diodes 35A is set to orange and the hue of the two light emitting diodes 35A on the right end side is set to red, the speed set in the subtransmission B increases.
The operation mode is set such that the number of light-emitting diodes 35A is increased in a bar graph in the order of green, orange, and red (from the left), and the right-hand end of the light-emitting diodes 35A is turned on and off. It is configured such that the operator can grasp the traveling speed of the machine body 3 by using the control unit.

As shown in FIGS. 1 and 5, a control case 37 for controlling the rolling of the seedling planting apparatus A is disposed at a side position of the driver's seat 8. A horizontal switch 38 for keeping the rolling posture of the device A horizontal, and a lower right switch 3 for changing the device to a downward right to maintain it
9 and a lower left switch 40 which is changed to the left down and maintained. The switches 38, 39, and 40 have small operation strokes that are operated via a waterproof resin film stretched over the operation surface (the rolling operation system is not described in detail).

As shown in FIG. 9, a control system is constituted. In this control system, a dynamo 42 driven by the engine 4 to a control device 41 having a microprocessor (not shown), 34, a speed increasing switch 4 for detecting that the forward / reverse lever 26 has been operated to the speed increasing position IN
3, a speed reduction switch 44 for detecting that the forward / reverse lever 26 has been operated to the deceleration position DE, the speed change sensor 22, a neutral switch 45 for detecting that the forward / reverse lever 26 has been operated to reach the neutral position N, A main clutch “ON” switch 46 for detecting that the clutch 23 has been disengaged,
The main clutch "off" switch 47 for detecting that the main clutch 23 is engaged and operated, the horizontal switch 38, the lower right switch 39, the lower left switch 40, and the lifting lever 3
An input system is formed from a lever sensor 48 for measuring the operation position of 0, an automatic deceleration switch 49 provided in the meter panel section 32, and an implanting clutch sensor 50 for determining the state of the implanting clutch C. An output system is formed for each of the relay circuit 51 for controlling the power supplied to the speed change motor 21, the speed change display device 35, the automatic deceleration lamp 52, and the EEPROM type memory 53 (the elevation drive system and the rolling drive system are not shown). ).

In the control device 41, an A / D of approximately 8 bits is provided to an input system from a potentiometer type output device such as the auxiliary speed change set device 34, the speed change sensor 22, and the lever sensor 48 for outputting a voltage signal. The hardware is configured to include a converter (not shown) to quantize (digitize) the voltage signal and process it by the microprocessor. For example, in a simple feedback control, the voltage signal from the setting system is quantized. The configuration is such that a deviation is obtained by subtracting a value and a value obtained by quantizing a voltage signal from the feedback system, and a process of controlling an actuator or the like can be performed on the side where the deviation becomes smaller.

In the control device 41, data for correcting an error of the link between the sub-shift setting device 34 and the dial 34A and an error based on an individual difference of the sub-shift setting device 34 are stored in the memory 53, and In the memory 53, data for correcting an error in the linkage between the shift operation system and the shift sensor 22 and an error based on an individual difference of the shift sensor 22 is stored in the memory 53. The control operation is set so as to perform appropriate control based on the control operation.

That is, as shown in the flow chart of FIG. 10, when shifting by the sub-shift setting device 34 (shifting when the forward / reverse lever 26 is operated to the acceleration position IN and the deceleration position DE is not described), Two error values and two target values as data stored in 53 are read, and correction values corresponding to a plurality of set positions of the sub-shift setting device 34 are calculated in advance based on the two errors, Further, based on the two target values, target positions corresponding to a plurality of set positions of the sub-shift setting device 34 are calculated (steps # 101 to # 103, control operations for storing data in the memory 53 will be described later). ).

As shown in FIG. 7, these two error values ED
1, ED7 are the voltage signals E1 'and E7' of the subtransmission setting unit 34 and the reference voltage signals E1 and E7 when the dial 34A of the subtransmission setting unit 34 is set to "1" and "7", respectively. (Corresponds to the setting reference signal in item 1)
As shown in FIG. 8, the two target values S1 'and S7' are set in the sub-shift setting device 34 with the dial 34A set to the "1" and "7" positions. This is the same as the signal value fed back from the shift sensor 22 when the transmission B obtains an appropriate shift state.

The sub-shift setting device 34 is set to "1" and "7".
Voltage values E1 ', E7' when set at respective positions
Can be regarded as the set voltage characteristic FR of the sub-shift setting unit 34, and the signal according to the characteristic FR is corrected corresponding to each set position of the sub-shift setting unit 34 (in the case of FIG. 7, By performing the subtraction), a setting signal that matches the reference voltage characteristic FS is obtained. Therefore, in step # 102, all corrections including the intermediate position of the operation range of “1” to “7” of the subtransmission setting unit 34 are performed. A process for obtaining a value in advance is performed.

Further, the sub-shift setting device 34 is set to "1" and "7".
Target values S1 'and S7' when set at respective positions
Is set in accordance with the reference voltage characteristic FS, and a straight line connecting the respective target values S1 'and S7' is regarded as the control target characteristic GR. Processing for obtaining a predetermined target signal is performed corresponding to all operation positions including the intermediate position in the operation range of “1” to “7”. This target signal may have different characteristics compared to the initial reference target characteristics GS due to an adjustment operation described later.

Next, a signal from the sub-shift setting unit 34 is input, and a correction (addition or subtraction) set in accordance with the voltage value is performed, and a setting signal (reference voltage characteristic) obtained by this correction is obtained. FS), and sets a control target (a value on the graph of the control target characteristic GR is set).
The control that drives the speed change motor 21 in the direction in which the value of the detection signal fed back from the speed change unit 2 matches and continues to display the speed set by the sub speed change set device 34 on the speed change display device 35 is continued until it is reset (# 104). ~ # 109 steps). The setting signal correcting means H according to claim 1 is constituted by a program for performing the correction process represented by step # 105 in this control.

In the control device 41, when the dial 34A is set at a predetermined position due to an error in mechanical linkage between the sub-shift setting device 34 and the dial 34A and an individual difference of the sub-shift setting device 34. A process of obtaining an error from a reference voltage value (an ideal voltage value and a value on the reference voltage characteristic FS) and storing data enabling the above-described control in the memory 53; The control operation is set so that the process of storing the data enabling the above-described control in the memory 53 by absorbing the error of the link between the mechanical system for performing the shift operation and the shift sensor 22 is performed. It is represented as shown in the flowchart.

That is, when the key switch for starting the engine 4 and energizing the electric system of the body is turned on, the neutral sensor 45 detects that the neutral position N of the forward / reverse lever 26 is in the neutral position, and the elevation lever 30 Is in a neutral position (an operation position for stopping the raising and lowering of the seedling planting device A) by the lever sensor 48, and the lower right switch 3 of the control case 37 is detected.
9 and the lower left switch 40 are simultaneously ON, the main clutch “ON” switch 46 is detected to be ON, the automatic deceleration switch 49 is detected to be OFF, The sub-shift setting device 34 detects that the dial 34 of the No. 34 is at the position of “4”.
Only when it is determined that the engine 4 has started based on the voltage signal from the dynamo 42, the starting condition is satisfied and the control is started (# 201 step).

When the start condition is satisfied, a timer (comprising software) is operated, and the dial 34A of the sub-shift setting device 34 is operated to "1" within the time set by the timer. Only when this is the case, the control of the first adjustment mode (# 300 step) is performed. When the control of the first adjustment mode is completed, the timer is operated, and the dial of the sub-shift setting device 34 is turned within the time set by the timer. Only when operated to “7”, the second adjustment mode (# 40
The processing operation is configured to continue the process of performing the control of (step 0) until the end condition that the horizontal switch 38 and the lower left switch 40 are simultaneously turned ON is satisfied (#).
202 to # 210 steps).

When the sub-shift setting device 34 is not operated to the predetermined position within the time set by the timer in this control, # 205 is a process for forcibly terminating the control.
A program for executing each of the # 206 steps.
Is constituted.

In this control, when the dial 34A of the sub-shift setting device 34 is set to, for example, "1", the sub-shift is set within a voltage range based on a reference voltage set in advance corresponding to the "1". If there is a voltage value from the speed change setting device 34, it is determined that the dial 34A is set to "1", so that there is some error in the relative positional relationship between the sub speed change setting device 34 and the dial 34A. However, control based on “1” can be performed. If the voltage value from the sub-shift setting device 34 does not exist in the corresponding voltage range, the control itself becomes impossible.

The first adjustment mode (# 300 step)
And the second adjustment mode (# 400 step) have almost the same processing operation, and therefore each will be described based on the processing in the first adjustment mode. That is, as shown in the flowchart of FIG. 12 and FIGS. 7 and 8, first, the setting signal value from the auxiliary transmission setting device 34 is input, and the error ED1 ( In the case of the second adjustment mode, ED2) is calculated, and the setting position "1" of the sub-transmission setting device is set.
The target value S1 corresponding to (“7” in the case of the second adjustment mode) (S7 in the case of the second adjustment mode) is read from the memory 53 (Steps # 301 and # 302).

Next, when the speed increase switch 43 is turned ON by operating the forward / reverse lever 26, the read target value is incremented (increased by one bit), and the deceleration switch 44 is also operated by operating the forward / reverse lever 26. Is turned on, the read target value is decremented (decreased by one bit), and control is performed to control the speed change motor 21 in a direction in which the target value matches the signal value from the shift sensor 22. . This control is performed by the dial 34 of the sub-shift setting device 34.
When A is set to “1” (“7” in the case of the second adjustment mode), the sub-transmission 34 is a process for producing a speed corresponding to the set position. When performing the operation, the target value is changed by the speed-up switch 43 and the speed-reduction switch 44 while the engine E is actually operated, so that a required shift value corresponding to the setting value of the dial 34 of the sub-shift setting device 34 is obtained. By operating the speed change motor 21, the signal value from the speed change sensor 21 at the time of reaching an appropriate speed change state corresponding to the set position of the sub speed change set 34 is set to a target value S 1 ′.
(S7 'in the case of the second adjustment mode). In this process, an operation for obtaining the required shift state by artificially adjusting the mechanical linkage between the speed change motor 21 and the auxiliary transmission B is performed. (# 3)
03 to # 307 steps).

When the adjustment is completed by this processing, a memory operation for simultaneously turning on the horizontal switch 38 and the lower right switch 39 is performed, whereby the error ED1 () of the voltage value from the sub-shift setting device 34 with respect to the reference voltage value is obtained. In the case of the second adjustment mode, WD2) is written into the memory 53, and the target value S1 '(S7' in the case of the second adjustment mode) corresponding to the set position of the subtransmission 34 is written into the memory 53. (Steps # 308 and # 309).

In other words, in this process, a preset operation tool is set at a predetermined position, and this process (adjustment mode) is enabled when a plurality of switches are simultaneously turned ON without being operated during work. Even if this process is started, if a necessary operation is not performed within a set time, this process is forcibly terminated, so that control for work is not affected. Further, in this processing, when the dial 34A of the sub-shift setting unit 34 is set to, for example, “1”, the voltage signal from the sub-shift setting unit 34 is included in the voltage range set in advance corresponding to “1”. If it is determined that the operating position is "1", the memory 53 determines a correction value for converting the voltage signal from the auxiliary transmission setting device 34 into a reference voltage corresponding to "1". , And an operation of holding a target value for obtaining a shift state in the memory 53 corresponding to the reference voltage.

As described above, in the present invention, even if the linkage between the potentiometer type sub-shift setting device 34 and the dial 34A is not proper, even if there is an individual difference in the sub-shift setting device 34, the above-described adjustment mode processing is executed. Correction value is automatically obtained only when the gear is shifted, an ideal setting signal is obtained by processing based on the correction value at the time of shifting, and the target value corresponding to the set position of the sub-shift setting device 34 is also held at the same time. Therefore, even if the adjustment of the shift operation system of the mechanically operated auxiliary transmission B is not perfect, and the linkage between the shift sensor 22 and the bell crank 20 or the like is not appropriate, an appropriate target value can be set during shifting. This allows for accurate shifting.

Incidentally, when the automatic deceleration switch 49 is turned on during the work, the control target of the auxiliary transmission B is set in advance at the timing when the planting clutch C is disengaged in conjunction with the raising of the seedling planting device A. The control to reduce the traveling speed of the body 3 to the minimum speed is enabled by replacing the speed with the set low value (the control operation is not described), and when the automatic deceleration switch 49 is turned ON, the automatic operation is performed. The deceleration lamp 52 is turned on.

[Other Embodiments] The present invention can be configured as follows in addition to the above-described embodiment.

In the above-described embodiment, the processing for increasing the accuracy of determining the set position of the shift setting device is performed by setting the shift setting device at two positions, ie, the deceleration side and the speed increasing side.
For example, by setting the shift setting device only at one position on the deceleration side, a correction value is obtained and stored in a memory, and the correction value is added to a voltage signal from the shift setting device during shift control.
Alternatively, it may be configured to perform a simplified process to obtain a corrected setting signal by subtraction.

The characteristic (FR in FIG. 7) of a straight line connecting the two set values obtained by setting the shift setting device at two positions on the deceleration side and the speed increase side is expressed by an equation. The parameters and constants to be converted into the reference voltage characteristics (FS) are obtained in advance,
At the time of shifting, it is possible to determine the operation position from the voltage signal from the setter and to set the control operation so as to obtain a reference voltage corresponding to the set position by performing further conversion.

[0044]

Therefore, a shift control device for obtaining an appropriate shift state corresponding to an operating tool by performing automatic correction even when the shift setting device and the operating tool are not in an appropriate linked state is rationally constituted. (Claim 1). Further, the correction can be made by simple and simple electrical processing (claim 2), and the adjustment mode is forcibly terminated so that the correction value for the speed setting device is not deviated (claim 3). ).

[Brief description of the drawings]

FIG. 1 is an overall side view of a rice transplanter.

FIG. 2 is a partially cutaway side view of the front part of the rice transplanter.

FIG. 3 is a plan view of the front part of the rice transplanter.

FIG. 4 is a plan view of a meter panel unit.

FIG. 5 is a plan view of a control case.

FIG. 6 is a side view showing the operation path of the forward / reverse lever.

FIG. 7 is a graph of a setting signal of a speed setting device.

FIG. 8 is a graph in which a target signal with respect to a setting signal is graphed.

FIG. 9 is a block circuit diagram of a control system.

FIG. 10 is a flowchart of a sub-shift control routine.

FIG. 11 is a flowchart of a program for performing a correction process.

FIG. 12 is a flowchart of a first adjustment mode.

[Explanation of symbols]

 3 Airframe 21 Actuator 22 Feedback sensor 34 Speed setting device 34A Operating tool 41 Control means B Transmission H Setting signal correction means J Forced termination means

Claims (3)

[Claims] 1. A potentiometer-type speed setting device configured to be freely set in a plurality of stages via an operation tool, a transmission device that continuously changes the traveling speed of the body by an actuator,
Shift control for a work implement, comprising: a feedback sensor for detecting a shift position of a transmission; and control means for driving an actuator until a shift position corresponding to a voltage signal from the speed setting device is detected by a signal from the feedback sensor. An apparatus, wherein the shift control device is configured to be switchable to an adjustment mode for adjusting a speed setting system thereof, and in the adjustment mode, the operating tool is set to one of the plurality of stages. When it is determined that the setting signal value from the speed setting device is within a predetermined range, the setting signal of the speed setting device at the time of this determination is regarded as a preset setting reference signal corresponding to the setting stage, and A shift control device for a working machine, comprising a setting signal correcting means for obtaining a setting signal corrected based on the setting reference signal at the time of shifting control. 2. The method according to claim 1, wherein the setting signal correction means obtains a value of a difference between a signal from the speed setting device and a preset setting reference signal in the adjustment mode, and outputs a correction value based on the difference from the speed setting device. The shift control device for a work machine according to claim 1, wherein the corrected setting signal is obtained by adding or subtracting the setting signal from the signal. 3. The shift of a working machine according to claim 1, further comprising a forced ending means for terminating the adjustment mode when a necessary operation is not performed within a set time after the switching to the adjustment mode. Control device.