JP2562851Y2 - Control device in working vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a control device for a working vehicle such as a combine, and more particularly, to a main clutch that is operated by one actuator that operates in response to a shift lever operation. The present invention relates to a control device for a working vehicle in which a continuously variable transmission is operated on a speed increasing side or a decelerating side while connecting and disconnecting.

(B) Conventional technology Conventionally, a forward / reverse switching gear in a transmission case is mechanically switched in conjunction with an operation of moving an F / R continuously variable transmission lever from a neutral position to a forward range (or a reverse range). A speed change device which is configured to reduce the size of the device has been devised by the present applicant (Japanese Patent Application Laid-Open No. 63-1677).
No. 20).

The shift operating device switches the forward / reverse switching gear to the forward side or the reverse side by tilting the F / R continuously variable transmission lever laterally at the neutral position in the crank-shaped lever groove, Further, based on the tilting operation of the shift lever from the position toward the forward range and the reverse range, one hydraulic cylinder is extended to connect the main clutch, and the continuously variable transmission is operated to increase the speed. Have been.

(C) Problems to be Solved by the Invention By the way, the above-described transmission operating device devised by the present applicant detects the tilt angle of the continuously variable transmission lever with a lever potentiometer. The amount of operation of the hydraulic cylinder that expands and contracts based on the detected value is detected by a cylinder potentiometer and fed back, and the main clutch is disconnected and connected by the hydraulic cylinder that expands and contracts according to the operation angle of the shift lever, and Since the speed change device is configured to increase / decrease the speed, the shift lever is set when a normal voltage value cannot be output due to a short circuit or disconnection in the wiring of the lever potentiometer or the cylinder potentiometer. Operation corresponding to the above operation cannot be obtained, and despite operating the lever to the neutral position, There is a possibility that a problem such as the traveling body continuing to travel without the main clutch being disconnected may occur.

Therefore, the present invention is configured such that, when an abnormality occurs in the output value of a lever detecting means such as a potentiometer, an alarm is issued and the actuator is forcibly operated in a direction for disconnecting the main clutch. It is an object of the present invention to provide a control device for a working vehicle that has solved the problem.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances, and corresponds to the operation of the shift lever (18), for example, as shown in FIG. 1 to FIG. Operating the one actuator (30), disconnecting and connecting the main clutch (34) and operating the continuously variable transmission (25) to the speed increasing side or the speed decreasing side based on the actuator (30). In FIG. 10, the operation / operation amount detection means (53), (42) for detecting the operation amount of the shift lever (18) or the operation amount of the actuator (30).
An abnormal value detection means (68) for detecting an abnormal value of the operation / actuation amount detection means; and an abnormal value of the operation / actuation amount detection means (53), (42). Is detected, an operation signal is transmitted to alarm means (66) and (67) such as a lamp and a buzzer, and the actuator (30)
Alarm / disconnecting means for intermittently sending an operation signal to the device (69)
And the actuator (30) operates intermittently based on a signal from the alarm / disconnect means to gradually reduce the speed of the continuously variable transmission (25), and the vicinity of the operating end of the actuator. In the control device for a working vehicle, the main clutch (34) is disengaged.

(E) Operation Based on the above configuration, when the speed change lever (18) is operated on the speed increasing side, the operation / actuation amount detecting means (53) is operated by the speed change lever (1).
8) The operation angle of the actuator is detected, and the actuator (3
0) is extended to connect the main clutch (34) and operate the continuously variable transmission (25) at the speed increasing side. At this time, the operation amount of the actuator (30) is detected by the operation / operation amount detection means (42), and based on the detected value, the actuator (30) stops at a position corresponding to the operation angle of the shift lever (18). Is done.

On the other hand, if the operation / actuation amount detection means, for example, the lever potentiometer (53) cannot properly detect the operation angle of the shift lever (18) due to disconnection or short circuit of the wiring during traveling, Is detected by the abnormal value detecting means (68). Then, based on this, an operation signal is transmitted from the alarm / disconnect means (69), the alarm means (66), (67) issues an alarm, and the actuator (30) operates intermittently, so that the continuously variable transmission ( 25) is gradually operated in the deceleration direction, and the main clutch (34) is disengaged at the maximum deceleration position of the continuously variable transmission. Therefore,
When the lever potentiometer (53) cannot properly detect the operation angle of the operation lever (18), the malfunction is notified to the operator by an alarm, and the continuously variable transmission (25) is used for the work vehicle (1). Is decelerated smoothly, and the main clutch (34) is forcibly disengaged and the work vehicle (1) stops.

Also, when the operation / operation amount detecting means for detecting the operation amount of the actuator (30), for example, the cylinder potentiometer (42) cannot detect an appropriate value due to disconnection or short circuit of its wiring, the same as described above. Then, an alarm is issued, the continuously variable transmission (25) is gradually decelerated, the main clutch (34) is disengaged, and the work vehicle (1) is stopped.

Note that the reference numerals in parentheses are for referring to the drawings, but do not limit the configuration in any way.Also, even if the reference numerals are the same, they are described based on the claims of the utility model registration, The names may be different from the names of the embodiments described below.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 10, the combine 1 has a traveling body 3 supported by a crawler 2, and one side of the body 3 has a driver's seat 5, a Glen tank 6, and an engine 7 from the front side. Is arranged. Further, in front of the machine body 3, a pre-processing unit 9 is supported so as to be able to move up and down, and a number of dividers 10 are arranged in the pre-processing unit 9 over substantially the entire width of the machine body. And a transport device. On the other hand, a driver's seat 5 is provided with a control console 12 in front of the driver's seat 5 and a driver's seat 15 behind the driver's seat 15 via a seat frame.
Is installed. A side clutch lever 16 is arranged on the operation console 12, and various instruments are installed. On the side operation panel 4 (see FIG. 2) disposed adjacent to the driver's seat 5 inside the fuselage, a reaping clutch lever 8 (see FIG. 2), an F / R continuously variable transmission lever 18 and the like are disposed. Have been.

On the other hand, as shown in FIG. 3, in the traveling drive system of the combine 1, the engine output side is connected to the drive side split pulley 28 via a gear train, and the split pulley 28 is connected to the driven side split pulley 26. An endless belt 27 is wound therebetween to form a continuously variable transmission 25. Further, a main clutch 34 is interposed between the driven split pulley 26 and the transmission case M. The main clutch 34 is disengaged and connected by rotating the clutch cam 29 so that the transmission case M M
The transmission of the driving force to the motor is switched. Then, the clutch cam 29 is rotated in conjunction with the operation of the continuously variable transmission hydraulic cylinder 30 based on the operation of the continuously variable transmission lever 18. That is, when the continuously variable transmission lever 18 is operated from the neutral position N on the speed increasing side, the continuously variable transmission hydraulic cylinder 30 is extended based on this operation, the side brake 32 is released, and the main clutch 34 It is connected by a cam 29 that rotates by the urging force, and furthermore, a continuously variable transmission 25
However, the endless belt 27 is moved between the two pulleys 28 and 26 by the speed change cam 35 rotating via the arms 31 and 32 and the rod 33, so that the endless belt 27 is moved between the two pulleys 28 and 26. Is transmitted to the transmission case M.

In addition, as shown in FIG.
An end of the piston rod 30a of the arm 30 is connected to one end of the arm 31. The arm 31 is turned around an axis 36 based on the expansion and contraction operation of the hydraulic cylinder 30, and an arm provided on the axis 36 is provided.
37, the clutch cam 29 is rotated via the clutch rods 39 and 40 to disconnect and connect the main clutch 34, and the transmission cam 35 is rotated via the transmission arm 32 and the rod 33, so that the continuously variable transmission 25 Are configured to be operated on the increase / decrease side. When the continuously variable hydraulic cylinder 30 is operated, a pin 41 protruding from the side of the cylinder arm 31 is installed.
Thus, the arm 43 connected to the shaft 42a of the cylinder potentiometer 42 is rotated, and the amount of expansion and contraction of the continuously variable transmission hydraulic cylinder 30 is detected by the potentiometer 42. In the drawing, reference numeral 24 denotes a lead wire.

As shown in FIGS. 2 (a) and 2 (b), the side operation panel 4 is provided with a reaping clutch lever 8 and an F / R continuously variable transmission lever 18, and the transmission lever 18 is a bracket. The body is configured to be rotatable in the longitudinal direction about a support shaft 46 provided on the body 45 and swingable in the lateral direction of the body by a pin 49 pivotally supported by a bracket 47 installed on the body 3.
Further, the continuously variable transmission lever 18 can be positioned via a click stop 50, and is continuously variablely moved to a rotating shaft of a lever potentiometer 53 via a pin 51 and an arm 52 which are provided to protrude in the lateral direction. It is configured to transmit the tilt of the lever 18. The pin 49 has an arm.
55 is fixed at one end thereof so as to rotate in the vertical direction in accordance with the lateral swinging of the speed change lever 18, and the arm
The other end of 55 is connected to a rod 56 for switching a forward / reverse switching gear inside the transmission case M by its vertical movement.

On the other hand, as shown in FIG. 1, a CPU 60 of a microcomputer 60 (hereinafter referred to as a microcomputer) mounted on the combine 1
1, a lever potentiometer 53 and a cylinder potentiometer 42 are connected to its input port, and these potentiometers 53 and 42 are connected to pull-up resistors R1 and R1, respectively.
The output value of the lever potentiometer 53 or the cylinder potentiometer 42 of the CPU 61 indicates 5 V (FF in FIG. 4) when the signal line is disconnected, and when the short circuit occurs, the lever potentiometer is pulled up.
The output value of 53 or the cylinder potentiometer 42 indicates 0V. The output port of the CPU 61 is connected to the continuously variable shift valve 64 via the interface 62.
(Fig. 3) deceleration side solenoid 63, speed increase side solenoid 6
5. The alarm lamp 66 and the alarm buzzer 67 are connected.

The CPU 61 has an abnormal value detecting means 68 and an alarm /
Cutting means 69 is provided, the abnormal value detection means 68,
As shown in FIG. 4, the normal control use range α of the lever potentiometer 53 and the cylinder potentiometer 42
However, since 0V <α <5V, when the values of the potentiometers 53 and 42 indicate 0V or 5V, it is determined that a short circuit or disconnection has occurred in the wiring. Further, the alarm / deceleration means 69 issues an operation signal to the alarm lamp 66 and the alarm buzzer 67 based on the detection of the abnormal value by the abnormal value detection means 68 to turn on the alarm lamp 66 and the alarm buzzer 67.
At the same time, a signal is sent to the deceleration-side solenoid 63, and the continuously variable transmission hydraulic cylinder 30 is intermittently forcedly contracted based on the inching pulse signal p (FIG. 6), whereby the continuously variable transmission 25 is fully decelerated. It is configured to operate toward the side and disengage the main clutch 34. Since the hydraulic cylinder 30 is constantly urged in the direction of its extension by the clutch cam 29 being urged in the clutch connection direction by the spring 70, the extension side, that is, the continuously variable transmission 25 is accelerated. It is easy for leaks to occur on the side where
Even if the leakage occurs and the cylinder 30 is extended to connect the main clutch 34, the continuously variable transmission hydraulic cylinder
30 is contracted intermittently based on the inching pulse signal p.
30 is contracted intermittently, thus ensuring that the main clutch 34 remains disconnected when in neutral.

In the present embodiment, since the present embodiment is configured as described above, when the continuously variable transmission lever 18 is tilted to the forward position F, for example, in the neutral position N when traveling on the combine 1, the bracket 45 is centered on the pin 49 by the tilt. , Whereby the forward / reverse switching gear is switched to the forward side via the arm 55 and the link member 56.

When the continuously variable transmission lever 18 is operated from the neutral position N to an appropriate speed increasing position in the forward range F, the transmission
The turning shaft of the lever potentiometer 53 is turned with the turning of the 18, so that the potentiometer 53 outputs a voltage value corresponding to the tilt angle of the shift lever 18. Then, the voltage value is input to the CPU 61, and the speed-up solenoid 65 is excited by a signal based on the voltage value, and the continuously variable transmission hydraulic cylinder 30 is excited.
Is extended. Then, in a state where the hydraulic cylinder 30 is contracted, the main clutch 34, which has been disconnected by the clutch rod 39 abutting on the upper end of the rod 40, is extended via the arm 31, the shaft 36 and the arm 37 by the extension of the hydraulic cylinder 30. The clutch rod 39 is lifted to release the rod 40, whereby the clutch cam 29 is rotated by the spring 70, and the main clutch 34 is connected. In addition, arm 37
The speed change cam 35 is rotated to the speed increasing side via the rod 33 by the speed change arm 32 which rotates in the same manner as described above, whereby the width between the two sheaves constituting the drive side split pulley 28 is reduced, and the endless belt The endless belt 27 having a fixed length is moved to the inner peripheral side of the driven split pulley 26, and the continuously variable transmission 25 is operated at an increased speed. The extension operation of the continuously variable transmission hydraulic cylinder 30 is detected by the cylinder potentiometer 42 and fed back, so that the hydraulic cylinder 30 is moved to a position corresponding to the tilt angle of the continuously variable transmission lever 18 detected by the potentiometer 53. Stopped at As a result, the speed of the combine 1 traveling forward is adjusted to the speed corresponding to the continuously variable transmission lever 18.

Also, when the continuously variable transmission lever 18 is tilted from the neutral position N toward the reverse region R and rotated toward the speed increasing side, the forward / reverse movement is performed in the same manner as when operating the lever in the forward region F. The switching gear is switched to the reverse side, the main clutch 34 is connected, and the continuously variable transmission 25 is operated on the speed increasing side.

On the other hand, for example, during traveling, a short circuit occurs in the wiring and the lever potentiometer 53 or the cylinder potentiometer
When it becomes impossible for 42 to output a normal voltage value, the output values of these potentiometers 53 and 42 show 0 V as described above. Therefore, the abnormal value detecting means 68 detects an abnormal value of the lever potentiometers 53 and 42. Then, the alarm and disconnection means 6
9 is based on the abnormal value detection signal from the abnormal value detecting means 68,
An operation signal is output to the alarm lamp 66 and the alarm buzzer 67 to turn on the alarm lamp 66 and sound the alarm buzzer 67 (S1), and an intermittent operation (inching pulse) signal to the deceleration solenoid 63 of the switching valve 64. (P in FIG. 6), the hydraulic cylinder 30 for continuously variable transmission is intermittently contracted (S2), the continuously variable transmission 25 is operated to the maximum deceleration position, and the main clutch 34 is disconnected. . Further, when the clutch 34 is disengaged by the operation, the hydraulic cylinder 30 leaks, and as described above, even if the hydraulic cylinder 30 attempts to expand by the spring 70 or the like, the hydraulic cylinder 30 is intermittently contracted based on the inching pulse signal p. Therefore, a problem that the main clutch 34 is connected does not occur.

Further, in the present embodiment, when an abnormality is detected in the output value of the potentiometer 53 or 42, an alarm is issued and the main clutch 34 is forcibly disengaged to improve safety. With reference to FIG. 7 to FIG. 10, a description will be given of a configuration in which control is performed such as issuing an alarm when an abnormality occurs in an output value of a lift potentiometer or the like for detecting elevation of the unit 9.

As shown in FIG. 8, the lift frame 71 supporting the pre-processing unit 9 is configured to rotate in the direction of arrow A in FIG. By the rotation, the tip of an arm 73 whose one end is rotatably connected to the frame 71 rotates an arm 76 connected to the rotation axis of a lift potentiometer 75 installed on the body of the machine body, and the lift potentiometer 75 is rotated. The lift amount of the lift frame 71, that is, the pre-processing unit 9 is detected.

As shown in FIG. 7, the CPU 79 of the microcomputer 77 has a position control switch 80,
The lift manual operation switch 81 for lifting, the lift manual operation switch 82 for lowering, the potentiometer 75 for lift, and the setting volume 85 are connected, and the potentiometer
The signal lines of 75 and 85 are pull-up resistors R2, R
The signal lines are pulled up to 5V by 2 so that the signal line indicates 5V when a disconnection occurs in the wiring and 0V when a short circuit occurs in the wiring. The output port is connected to an ascending solenoid 86, a descending solenoid 87, an alarm lamp 89, and an alarm buzzer 90 for switching a pre-processing unit elevating switching valve via an interface 84.

Further, the CPU 79 is provided with an abnormal value detecting means 91 and a control switching means 92, and the abnormal value detecting means 91 is provided when the disconnection or short circuit occurs in the wiring of the lift potentiometer 75 and the setting volume 85. Is detected. Further, the control switching means 92 transmits an operation signal to the alarm lamp 89 and the alarm buzzer 90 based on the detection of the abnormal value by the abnormal value detecting means 91 to turn on the lamp 89 and output the buzzer.
At the same time as sounding 90, the position control by the lift potentiometer 75 and the setting volume 85 is stopped, and the control is switched to the lift manual operation switch 81 and the lift manual operation switch 82 for lowering. The solenoid 86 and the descending solenoid 87 are brought into a controllable state.

Accordingly, the operation will be described with reference to the flowchart shown in FIG. 9. It is determined whether the position control switch 80 is on or off (S3).
As a result, if it is in the ON state, it is determined whether or not the output value AD3 of the lift potentiometer 75 is within the range of 0 <AD3 <FF (S4). When it is determined that AD3 is within the range, the lift potentiometer 75 is used.
Is converted as the conversion value AD3X (S5). Further, the converted value AD3X is compared with a preset set value AD6 (S6). As a result, if the converted value AD3X is smaller than the set value AD6, an operation signal is output to the ascending solenoid 86. Then, the pre-processing unit 9 is raised (S7). Further, the S6
If the converted value AD3X is larger than the set value AD6, a signal is output to the descending solenoid 87 to lower the pre-processing unit 9 (S8), and if the converted value AD3X is equal to the set value AD6. In the meantime, no operation signal is output to both the ascending solenoid 86 and the descending solenoid 87, so that the preprocessing unit 9 is stopped at that position (S9).

On the other hand, in S4 (that is, abnormal value detection means 91), the output value
If it is determined that AD3 = 0 or the output value AD3 = FF,
The control switching means 92 outputs an operation signal to the alarm lamp 89 and the alarm buzzer 90 to turn on the lamp 89 and sound the alarm buzzer 90 (S10), and the lifting lift manual operation switch 81 and the lowering The on / off state of the lift manual operation switch 82 is determined (S11). As a result, when the lift manual operation switch 81 is on, the ascending solenoid 86 is energized to raise the pre-processing unit 9. (S12) If the lowering lift manual operation switch 82 is turned on, the lowering-side solenoid 87 is excited to lower the pre-processing unit 9 (S13). When both the lift manual operation switch 81 and the lift manual operation switch 82 are turned off, the ascending solenoid 86 and the descending solenoid 87 are turned off.
Is not excited, and the pre-processing unit 9 is stopped at that position (S14).

(G) Effects of the present invention As described above, according to the present invention, when the abnormal value detecting means (68) detects an abnormal value of the operation / actuation amount detecting means (42), (53), the alarm / disconnection is performed. Since the alarm means (66) and (67) are operated by the means (69) and the operation signal is output intermittently to the actuator (30), the detecting means (42) and (53) are connected to the wirings. When a normal voltage value cannot be output due to a short circuit or disconnection, an alarm can be immediately issued to notify the operator of the occurrence of a failure, and the actuator (30) is operated intermittently to continuously change the speed of the continuously variable transmission ( 25) and gradually reduce the speed of the main clutch (3
4) Disconnect. As a result, the work vehicle (1) is decelerated smoothly and stopped, so that the operator can be stopped without being shaken down, and the safety can be improved.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram according to the present invention, FIG. 2 (a) is a front view showing an installation structure of a continuously variable transmission lever, FIG. 2 (b) is a side view thereof, FIG. FIG. 4 is a diagram showing an output voltage value of a lever potentiometer, FIG. 5 is a perspective view showing a portion where a cylinder potentiometer is installed, and FIG. 6 is a flowchart showing the operation of the present embodiment. Furthermore,
FIG. 7 is an electric circuit diagram relating to safety control for raising and lowering in the position control of the preprocessing unit. FIG. 8 (a) is a front view showing the structure of a mounting portion of the lift potentiometer, and FIG. 8 (b) is a side view thereof. FIG. 9 is a flowchart showing the operation of the elevation safety control of the pre-processing unit. FIG. 10 is a perspective view showing the whole combine to which the present invention can be applied. 1: Work vehicle (combine), 18: Shift lever (FR)
Continuously variable transmission lever, 25: continuously variable transmission, 30: actuator (hydraulic cylinder for continuously variable transmission), 34: main clutch, 42, 53: operation / actuation amount detection means (cylinder potentiometer, lever potentiometer), 66, 67 ... alarm means (alarm lamp, alarm buzzer), 68 ... abnormal value detection means
69 ... Alarm / disconnection means.

Claims (1)

(57) [Scope of request for utility model registration] An actuator is actuated in response to an operation of a shift lever, and a main clutch is disengaged based on the actuation.
An operation / operation amount detecting means for detecting an operation amount of the shift lever or an operation amount of the actuator, in a working vehicle which is in contact with and operates the continuously variable transmission on a speed increasing side or a speed decreasing side; An abnormal value detecting means for detecting an abnormal value of the detecting means; and when the abnormal value detecting means detects an abnormal value of the operation / actuation amount detecting means, an operation signal is transmitted to a warning means such as a lamp or a buzzer. Alarm and disconnection means for intermittently transmitting an operation signal to the actuator, and the actuator is operated intermittently based on a signal from the alarm and disconnection means to gradually operate the continuously variable transmission. A control device for a working vehicle, wherein the control device is decelerated to a predetermined speed and the main clutch is disengaged near an operating end of the actuator.