KR20150095265A - Reverse rotating Power Take Off control device and control methods of agriculture vehicle - Google Patents

Abstract

Disclosed are a device and a method to control the backlashing PTO of an agriculture vehicle. According to the present invention, the device to control the backlashing PTO of an agriculture vehicle includes a backlashing PTO detecting unit for detecting a backlashing operation state of a PTO device; a vehicle speed sensor for sensing a driving speed of the vehicle; an elevation arm sensor for detecting a position of a working device connected to a three-point elevating device; a solenoid for regulating the elevation of the three-point elevating device; and a controller controlling the solenoid based on signals from the backlashing PTO detecting unit, the vehicle speed sensor, and the elevation arm sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse rotation power take off control device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse rotation PTO control apparatus and method for a farm work vehicle, and more particularly, to a reverse rotation PTO control apparatus and method for an agricultural work vehicle such as a tractor having a reverse rotatable PTO apparatus.

The agricultural work vehicle called 'Tractor' is structurally similar to a general automobile, but it is equipped with a powerful engine and is used mainly as a tractor with strong pulling force and strong, and for the cultivation purpose, So that various types of working machines can be selectively attached or detached.

This agricultural work vehicle is provided as a power for driving a work machine connected to the rear of the vehicle via a power take-off PTO shaft that is directly connected to the engine output shaft of the power output from the engine, and travels through a peripheral speed device and an auxiliary speed device Or the power shifted at a speed suitable for the operation is provided as power for running on the wheel side via the power transmission shaft connected to the transmission.

The PTO shaft for driving the working machine is configured to rotate only in one direction (normal rotation direction) as a normal operation is performed in a normal rotation state. However, in a special situation (in a rotary operation, And the rotation direction of the PTO is configured to be reversible in order to prepare for the flattening of the soil accumulated on the edge.

However, the power transmission portion is designed to focus on the good durability in the normal rotation direction in consideration of the fact that most of the work is a forward rotation work, even when the agricultural work vehicle in which the rotation direction of the PTO shaft is configured to be capable of forward / reverse switching, Therefore, there is a disadvantage that the durability of the power transmission portion is relatively weak in the reverse rotation direction.

Accordingly, when the operation in the reverse rotation PTO state is continued, the power transmission system, that is, the power transmission components such as gears or transmission shafts in the transmission (transmission) may be seriously damaged. Particularly, In the case of using a rotating PTO, there is a problem that serious damage such as breakage of gear teeth or twisting of the transmission shaft is more likely to occur.

Japanese Patent Laid-Open No. 2000-087773 (published on March 28, 2000)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for controlling a reverse rotation PTO of an agricultural work vehicle that can prevent damage to a transmission mechanism in a mission accompanying an overload in a reverse rotation direction when a reverse rotation PTO is used .

According to an aspect of the present invention, there is provided an agricultural work vehicle having a three-point elevating device for elevating and lowering a working machine and a PTO device capable of reversing rotation, Detection means; A vehicle speed sensor for detecting a running speed of the vehicle; A lift arm sensor for detecting a position of a working machine connected to the three-point elevator; A solenoid for raising and lowering driving control of the three-point elevating device; And a controller for controlling driving of the solenoid based on a signal provided from the reverse rotation PTO detection means, the vehicle speed sensor, and the lift arm sensor.

In one aspect of the present invention, the reverse rotation operation state of the PTO device is detected by the reverse rotation PTO detection means, the vehicle speed detected by the vehicle speed sensor in the forward direction is equal to or higher than a previously input speed, And warning means for indicating that the operator is aware of the dangerous situation when the detected position of the three-point elevator device is the working position.

The warning means detects the reverse rotation state of the PTO device by the reverse rotation PTO detection means and detects that the vehicle speed detected by the vehicle speed sensor in the forward direction is equal to or higher than a previously input speed, And may be configured to operate when the position of the elevating apparatus is the work position for a predetermined period of time.

Also, if the operation of the PTO shaft is in the reverse rotation state and the operation for a predetermined speed or more is continued for a predetermined time after the warning means operation, the controller may operate to move the lift arm up by operating the up solenoid.

Preferably, when the warning means is not used, the reverse rotation PTO detection means detects the reverse rotation operation state through the PTO device, the vehicle speed detected by the vehicle speed sensor in the forward direction is equal to or higher than the previously input speed, When the position of the three-point elevating device detected by the elevating arm sensor is maintained at the working position for a certain period of time, the elevating solenoid is operated by the controller control and the elevating arm can be moved upward.

According to another aspect of the present invention, there is provided a control method for a three-point elevator system, comprising: a first step of determining whether to control a three-point elevation device based on a forward / reverse operation state of the PTO device; And a second step of causing the three-point elevator to move up through solenoid control for interrupting the elevation drive of the three-point elevator, if it is determined that the control of the three-point elevator is required as a result of the determination in the first step And a reverse rotation PTO control method of the agricultural work vehicle.

Here, in the first step, the PTO axis is in the reverse rotation driving state, the vehicle moves at a speed higher than the input speed in the forward direction, and the state where the worker position connected to the three-point elevator device is in the work position continues for a certain time It can be determined that the control of the three-point elevating device is necessary.

In addition, if it is determined through the first step that the control of the three-point elevating device is required, the warning step is performed so that the operator can recognize that the elevated state is a dangerous state before the elevating control of the three-point elevating device through the second step .

According to the embodiment of the present invention, when the work is continuously performed at a constant speed or higher in the reverse rotation PTO operation state, the operator warns of a dangerous situation or raises the three-point elevator and elevates the worker, It is possible to prevent the parts (gears) from being damaged beforehand, and it is also possible to reduce the maintenance cost in accordance with the parts breakage.

1 is a side view of an agricultural work vehicle equipped with a reverse rotation PTO control device according to an embodiment of the present invention;
2 is an enlarged side view of a working machine elevating device disposed at the rear of the agricultural work vehicle;
3 is a perspective view of the three-point elevating apparatus shown in Fig.
4 is a hydraulic circuit diagram related to the ascending / descent of the three-point elevating device of the tractor.
5 is a block diagram schematically showing a configuration of a reverse rotation PTO control apparatus for an agricultural work vehicle according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an operating state of a work machine lifting-and-lowering operation performed by a reverse rotation PTO control device according to an embodiment of the present invention. FIG.
7 is a control logic for reverse rotation PTO control according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known configurations and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

FIG. 1 is a side view of an agricultural work vehicle equipped with a reverse rotation PTO control device according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged views of a work machine elevation device at the rear of a vehicle. The overall configuration of the mounted agricultural work vehicle will be briefly described first. Hereinafter, the tractor will be described as an example of the agricultural work vehicle equipped with the reverse rotation PTO control device.

1 to 3, the tractor includes a traveling wheel divided into a front wheel FW and a rear wheel RW, and a driver's seat 1 for vehicle operation is provided at the center of the vehicle. In the front of the driver's seat 1, there is formed an engine room 3 in which the engine 5 and the main components involved in driving the vehicle are mounted. In the rear of the vehicle, there is provided a three-point type elevating device for connecting a working device, .

The engine 5 is an electronic multi-cylinder engine in which the sensor senses the displacement of the foot accelerator pedal or the hand accelerator lever and the output is controlled as a control of an engine control unit (ECU, not shown) based on the sensed displacement value, The engine 5 is disposed at the bottom of the engine room 3 protected by the bonnet 4 in a longitudinal direction along the longitudinal direction of the vehicle body.

The engine room 3 is also provided with a post-treatment device (not shown) for a series of purifying processes for oxidizing and filtering the harmful substances contained in the exhaust gas discharged from the engine, The radiator 7 is disposed in front of the engine room so that the outside air introduced when the vehicle travels can be actively utilized.

A steering wheel (steering wheel) 11 to which a steering force for front wheel steering is inputted is disposed in the driver's seat 1 and various operation levers, buttons, and switches are provided, and a flow of a working fluid to be supplied to a steering cylinder Is connected to the steering handle 11 in a linkable manner via a steering column unit 10. The power steering unit (not shown)

The non-shifting power among the power output from the engine is provided as a power for driving the working machine 2 disposed in the transmission (transmission 9) and connected to the rear of the vehicle via the power take-off PTO shaft 12 directly connected to the engine output shaft , The transmission power of the peripheral device in the mission 9 and the auxiliary transmission is provided as a power for driving the vehicle to the wheel side through the in-mission traveling system driving shaft.

The PTO device including the PTO shaft 12 for power take-off is capable of rotating the PTO shaft in the forward / reverse direction independently of the traveling system drive shaft in accordance with the operation of the operating means such as the reverse PTO detecting means (Not shown), and the normal / reverse switching device may be a configuration of a synchromesh type gear mechanism of a known type including a hydraulic cylinder.

As shown in FIG. 2, the elevating device 6 disposed at the rear of the vehicle for connecting the working machine 2 includes a top link 60 and a pair of left and right lower links 62, And the ends of the left and right lifting arms 64 and the left and right lower links 62 are connected to each other through the lifting rods 66. [

The lift arm 64 is pivoted by the expansion and contraction of the lift cylinder 65 (see Fig. 1) installed on the upper portion of the transmission case and the lower link 62 is pivoted to the pivot point P, the work machine 2 is moved up and down. At this time, the elevation arm sensor provided on the pivot shaft of the elevation arm 64 detects the elevation angle of the elevation arm 64, so that the elevation height of the elevation elevation mechanism 2 is calculated.

Fig. 4 is a schematic hydraulic circuit diagram of the three-point elevation device of the tractor, and Fig. 5 is a block diagram schematically showing the configuration of the reverse PTO control device of the agricultural work vehicle according to the embodiment of the present invention.

The forward / reverse switching device for switching the rotation direction of the PTO shaft converts the PTO shaft to either the forward direction or the reverse direction by operating the PTO forward / reverse lever 13 (see FIG. 1) disposed in the vicinity of the driver seat. 13) is switched to the reverse position, the reverse rotation PTO detection means 32 detects the reverse rotation operation state of the PTO shaft and provides the detection signal to the controller 30.

The controller 30 receives a detection signal of an angle sensor, for example, a potentiometer, according to an operation of a work machine lift lever (not shown) disposed around the driver's seat to determine an operation position of the work machine lift lever, The lift arm 64 is rotated by interrupting the driving of the lift cylinder 65 by sending a control signal to the lift solenoid 35a or the fall solenoid 35b of the lift control valve 35 in accordance with the signal provided from the lift arm 35a.

The ascending / descending control valve 35 involved in ascending and descending of the ascending / descending arm 64 mainly includes an ascending main spool 35c, an ascending solenoid 35a, a descending main spool 35d, a descending solenoid 35b, an unloading valve 35e When the driver lightly moves the lift lever with the electric angle sensor attached thereto, the solenoid is actuated correspondingly, so that the lifting or lowering main spool 35c or 35d is opened or closed so that the lifting arm 64 And can be lifted and lowered.

The controller 30 discriminates whether or not the operation is in the reverse rotation state of the PTO shaft based on the signals provided from the reverse rotation PTO detection means 32, the elevation arm sensor 34 and the vehicle speed sensor 36, When the rotating work state is continued for a predetermined time, the control signal is sent to the ascending solenoid 35a of the ascending / descending control valve 35 for controlling the driving of the ascending / descending cylinder 65 so that the ascending / descending arm 64 is moved upward.

In the reverse rotation work discrimination of the PTO shaft 12, the reverse rotation operation of the PTO shaft is detected through the reverse rotation PTO detection means 32, and the forward / reverse lever is detected in the forward position through the forward switch 31 , The vehicle speed detected by the vehicle speed sensor 36 is equal to or higher than a previously input speed and the position of the lifting arm 64 detected by the lifting arm sensor 34 is at the work position (lowering position) can see.

The PTO detecting means 32 may be a switch that is turned on / off according to the PTO forward / reverse lever operation, or may be a sensor that detects the rotational direction of the PTO shaft and senses whether it is in the reverse rotation operating state, The input speed may preferably be 2 km or more.

If the work is continued continuously for a predetermined time period, preferably at a speed of 2 km or more, the parts disposed in the mission, such as gears for power transmission, may be seriously damaged as described above.

Therefore, if the state is maintained for a predetermined period of time, the lift arm 64 is moved up by the control of the ascent solenoid 35a by the controller 30 to move the worker (rotary device) (See the operating state of Fig. 6), so that the excessive load is not transferred to the parts arranged in the mission according to the reverse rotation PTO operation.

The work is continuously performed for a predetermined time longer than the previously inputted speed in the reverse rotation PTO work state and the driving state of the present PTO apparatus before the worker is lifted through the control of the ascent solenoid 35a may be, And a warning means for displaying, for example, a buzzer, a lamp or the like, to allow the operator (driver) to recognize that the risk such as breakage is great.

If the warning means is applied and the operation of the warning means is continued and the operation of the PTO shaft 12 in the reverse rotation state continues for a predetermined speed or higher, the controller 30 interrupts the control of the rising solenoid 35a So that the elevating cylinder 65 is moved in the direction of moving the elevating arm 64 upward so that the working machine 2 is separated from the work surface.

Figure 7 shows specific control logic for reverse PTO control.

Referring to FIG. 7, the reverse rotation PTO control process performed through the reverse rotation PTO control device having the above-described configuration will be described in connection with the operation of the control device.

First, it is determined whether or not the controller will intervene in the elevation / descent of the three-point elevation device based on signals provided from the sensors and switches in the initial state of the vehicle speed sensor, the reverse rotation PTO detection means, the forward switch and the elevation arm sensor.

Specifically, the reverse rotation PTO detecting means detects the reverse rotation operation state of the PTO shaft, and the forward / backward lever is in the forward position detected by the forward switch, and the position of the worker connected to the three- (Up solenoid = 0), and it is judged that the control is necessary when the reverse rotation PTO operation state in which the forward movement exceeds the set speed continues for a predetermined time.

When it is judged that the above-mentioned condition is satisfied and control of the three-point lift device is required, control is performed so that the three-point lift device is lifted up through solenoid control for interrupting the three-point lift device lift driving. Specifically, a control signal is sent to the ascending solenoid among the solenoids for interrupting the driving of the lifting cylinder to control the lifting arm to move upward.

That is, when it is determined that the PTO operation state is the reverse rotation, and the state is maintained for a certain period of time, it is determined that the controller can cause serious damage to the internal parts (gears) of the mission. So that the work machine (rotary device) in operation can be lifted to prevent the parts damage due to the reverse PTO operation.

In a case where the work is continuously performed for a predetermined time longer than the previously inputted speed in the reverse rotation PTO work state, the driving state of the present PTO apparatus may be increased due to high load, before the work machine is lifted through the ascending solenoid control, A warning step may be intervened in which the operator (driver) can recognize that the risk such as breakage is great.

In the case where the warning step is applied, the controller intervenes to output an electric signal for controlling the ascending solenoid, if the operation of the PTO axis is in the reverse rotation state and the operation is continued at a constant speed despite the operation of the warning means , So that the elevating cylinder operates in a direction to move the elevating arm upward to lift the working machine connected to the elevating and lowering device.

According to the embodiment of the present invention described above, when the work is continuously performed at a constant speed or more in the reverse rotation PTO operation state, the user is warned of a dangerous situation, or the three-point lift apparatus is lifted to raise the worker, It is possible to prevent damage to internal components (gears) of the timing system, and it is possible to reduce the maintenance cost due to the damage of the parts.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

1: driver's seat 2: working machine
5: Engine 6: 3 point lift device
9: Mission (transmission 12: PTO shaft
13: PTO forward / reverse lever 30:
31: forward switch 32: reverse rotation PTO detection means
34: lift arm sensor 35: lift control valve
35a: rising solenoid 36: vehicle speed sensor
60: Top Link 62: Lower Link
64: lifting arm 65: lifting cylinder
66: lifting rod

Claims (8)

A three-point elevation device for raising and lowering a work machine and a PTO device capable of reversing rotation,
Reverse PTO detection means for detecting a reverse rotation operation state of the PTO device;
A vehicle speed sensor for detecting a running speed of the vehicle;
A lift arm sensor for detecting a position of a working machine connected to the three-point elevator;
A solenoid for raising and lowering driving control of the three-point elevating device; And
And a controller for controlling driving of the solenoid based on a signal provided from the reverse rotation PTO detection means, the vehicle speed sensor, and the lift arm sensor.
The method according to claim 1,
Wherein the reverse rotation operation state of the PTO device is detected by the reverse rotation PTO detection means and the vehicle speed detected by the vehicle speed sensor in the forward direction is equal to or higher than a previously input speed, And warning means for indicating that the operator is aware of a dangerous situation when the position is the work position.
3. The method of claim 2,
Wherein the warning means is a means for detecting the reverse rotation state of the PTO device by the reverse rotation PTO detection means and detecting the vehicle speed detected by the vehicle speed sensor in the forward direction at or above a previously input speed, And when the position of the device is in the work position, the operation is continued for a predetermined period of time.
The method of claim 3,
Wherein when the operation of the PTO shaft is in the reverse rotation state and the operation for a predetermined speed or more is continued for a predetermined time after the warning means operation is continued for a predetermined time, the elevating solenoid is operated and the elevating arm is moved upward by the controller control. Control device.
The method according to claim 1,
Wherein the reverse rotation operation state of the PTO device is detected by the reverse rotation PTO detection means and the vehicle speed detected by the vehicle speed sensor in the forward direction is equal to or higher than a previously input speed, Wherein the controller controls the up-solenoid and the up-and-down arm so that the up / down arm is moved upward when the position is in the working position for a predetermined period of time.
A first step of determining whether to control the three-point lift device based on the forward / reverse operation state of the PTO device, the traveling direction and speed of the vehicle, and the position of the worker; And
And a second step of ascending the three-point elevator by ascending / descending through solenoid control for interrupting the elevator / elevator driving of the three-point elevator, when it is determined that the control of the three-point elevator is required as a result of the determination in the first step A method for controlling the reverse rotation PTO of a work vehicle.
The method according to claim 6,
In the first step, when the PTO shaft is in the reverse rotation driving state, the vehicle moves at a speed higher than the input speed in the forward direction, and the state where the worker position connected to the three-point elevator device is in the working position continues for a certain period of time Wherein the control means determines that the control of the point lift device is necessary.
8. The method of claim 7,
And a warning step in which if it is determined that the control of the three-point elevator device is required as a result of the first step, the operator can recognize that the dangerous situation is prior to the elevator control of the three-point elevator device through the second stage A method of controlling a reverse rotation PTO of an agricultural work vehicle.

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