JPH10164907A - Engine controller for tractor or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the danger that a work device and a road surface are brought into contact and both are damaged when the work device is lowered by an erroneous operation in the middle of high-speed traveling like on-road traveling in a tractor. SOLUTION: In the tractor provided with a position controller for deciding a work position by the operation of a lever 1 and performing continuous vertical movement between the work position and a separately set non-work position through the operation of a switch 19, a means for controlling the rotation of an engine E so as not to be raised more than fixed when the work device 3 is not elevated by the operation of the lever 1 at the time of performing the on-road traveling after work is ended is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device such as a tractor, and more particularly to an engine control device such as a tractor for minimizing damage even when a working device descends and comes into contact with a road surface when traveling on a road capable of traveling at high speeds. Of course, it can be used for combine harvesters and seedling planters.

[0002]

In a tractor or the like, a working device is lowered to a working position by a hydraulic cylinder or the like or raised to a non-working position with respect to a vehicle body running with an engine mounted thereon. . These tractors set the working position of the working device by turning the hydraulic operating lever of the worker, and continuously rise from the set working position to a separately set non-working position by a switch operation. The switch can be operated to continuously lower the work position. This facilitates a turning operation on a headland or the like in a field. However, when running on the road with the working device raised by operating the switch, the switch is likely to be erroneously operated at the time of a gear shift operation or the like, and the erroneous operation causes the working device to be lowered at a stretch and the working device to contact the road surface. There was a risk of damaging both.

[0003]

According to the present invention, there is provided a working device 3 comprising:
Is continuously raised and lowered through the operation of the switch 19, and the tractor performs position control for raising and lowering according to the operation angle of the lever 1. Until the position
An engine control device, such as a tractor, is provided with a regulation means 8 for regulating the rotation of the engine E so as not to exceed a certain value.

[0004]

According to the hydraulic operating lever 1, the working device 3 is lowered to the working position or raised to the non-working position depending on the operating angle. When the height of the working device 3 is also at the low position, the rotation of the engine E can be freely increased by operating an engine rotation setting tool such as a throttle lever or an accelerator pedal.
Alternatively, it can be operated at low rotation. In addition, the hydraulic operating lever 1 is not used to raise the working device 3
Is raised to the non-working position by operating the switch 19,
When the traveling speed is a high road traveling speed, the rotation speed of the engine E is not increased to a certain value or more by the regulating means 8. However, when the working device 3 is raised to a raised position above a certain position by operating the lever 1, the engine speed output restriction is released, and the engine speed setting tool operates the engine E rotation speed as usual. Can be.

Thus, even when the vehicle is running on the road with the working device 3 being raised by operating the switch 19, the engine cannot be operated at a high speed, so that high-speed running cannot be performed. Even if the switch operation is pressed again due to an erroneous operation and the work device 3 is unexpectedly lowered, damage to the work device 3 or the road surface can be reduced as much as possible.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where a rotary tilling device is mounted as a working device 3 at the rear of a tractor will be exemplified. The tractor 4 has a front wheel 5 and a rear wheel 6, and is a four-wheel drive mode in which the tractor 4 can be driven and driven by an engine E mounted on a front portion. The steering is performed by operating the front wheel 5 with a steering handle 7. Do. The electronic governor 2 of the diesel engine E has a rack actuator 8 which is a regulating means for regulating the engine speed, and the position of the control rack is adjusted by supplying power to the rack actuator 8 with an output from the controller 9. The fuel injection amount is controlled.

The transmission case 1 constituting the vehicle body 4
At 0, a main transmission and an auxiliary transmission are arranged, and the shift position of the auxiliary transmission can be detected by the road traveling sensor 11. When the road travel sensor 11 detects the high-speed position, the road travel speed is input to the controller 9 assuming that the road travel speed is at the road travel speed. The on-road traveling sensor 11 may be provided with a vehicle speed sensor that detects the rotational speed of power transmission to the wheel shaft and detects the vehicle speed, instead of the shift position of the auxiliary transmission.

[0008] One side of the cockpit 12 has a hydraulic operating lever 1.
(Position lever) provided with potentiometer 1P
Therefore, the operation angle is detected and input to the controller 9. The elevation position of the working device 3 can be changed as appropriate by the operation angle of the lever 1. The hydraulic operating lever 1 may be used to change the ascending position of the working device 3 by using only a hydraulic operation, or by electrically detecting a rotation angle of a lift arm 13 to be described later and The hydraulic lift cylinder 23 may be operated so that the angle of the arm 13 matches the set angle of the lever 1. In addition, an upper limit setting dial 32 for setting an upper limit of a rise of the working device 3 is provided near the lever 1.

A hydraulic lift cylinder 2 is provided at the rear of the vehicle body 4.
3, the lifting device 13 is connected to the lifting device 13 via a lift rod 14, and the lower link 15 is moved up and down. A point link mechanism 17 is provided. On the input side of the controller 9, there are provided a potentiometer 1P of the hydraulic operating lever 1, an engine rotation sensor 18 for detecting the number of revolutions of the engine E, and a lifting switch 19 for continuously lifting and lowering the lift arm 13. When the switch 19 is turned on and off, the working device 3 is continuously moved up and down to a lower position set by the hydraulic operation lever 1 and an upper limit position determined by the upper limit setting dial 32.

The elevating switch 19 is provided with a switch at the base of the lever.
It may be configured in the form of a one-touch lever that turns N and OFF. A warning buzzer or a warning lamp is provided at an output section of the controller 9, and the operation device 3 is operated by the switch 19.
May be raised to alert the operator when shifting to a high-speed range in which the vehicle travels on the road.

A controller 9 for controlling the output of the electronic governor 2 controls the traveling speed by the road traveling sensor 11 to
When the operation speed is in the sub-shift low-speed position, the electronic governor 2
Is a normal control mode in which the engine speed can be operated by an accelerator pedal or the like, and the rotation of the engine E can be freely operated at high speed and low speed. Assuming that the sub-shift is shifted to the high-speed position and the traveling speed is set on the road, the operation angle of the hydraulic operation lever 1 is detected. When 3 is raised to the non-working position,
The rotation of the engine E is restricted to a low-speed rotation in which the supply of fuel is limited by the output of the rack actuator 8 and does not rise above a certain rotation. For example, the rotation of the control rack may be set to 1/2 of the opening at the time of maximum engine rotation, or may be set to 1/2 of the setting by the accelerator lever. By operating the hydraulic operating lever 1 to raise the working device 3 to a certain raising position, that is, a height that is once assumed to be a non-working position, the fuel by the rack actuator 8 of the electronic governor 2 is increased. The supply restriction is released, and the rotation of the engine E by the accelerator pedal or the like can be increased to a certain rotation or more.

Reference numeral 20 denotes a mode switching switch for switching a control mode for regulating the electronic governor 2, which maintains the engine speed according to the characteristics of the operation. 21
Reference numeral denotes a work implement attachment sensor for detecting that the work device 3 is attached to the three-point link mechanism 17. Reference numeral 22 denotes a hydraulic lock sensor that detects an opening of a hydraulic lock mechanism such as a slow return valve for preventing the working device 3 from being lowered by the lift cylinder 23. 24 is a PTO sensor,
The power interlocking state from the PTO shaft 25 on the vehicle body 4 side to the working device 3 is detected, and the PTO sensor 24 may be replaced by a PTO switch 26 that turns on and off the PTO clutch.

Reference numeral 27 denotes an automatic turning mode switch, and when the mode switch 27 is turned on, steering turning is automatically performed. By turning the steering handle 7 at a fixed angle, the working device 3 is automatically raised, the steering brake is braked, and the steering wheel is turned. Reference numeral 28 denotes a seat belt switch, which is turned on when a seat belt is put on. It turns off when the seat belt is not used.

Reference numeral 29 denotes a cabin door switch which turns on upon detecting that the door 31 of the cabin 30 is closed.
It is OFF when it is open. The on-road traveling sensor 11 detects the high-speed traveling position on the road, and also detects that the hydraulic operation lever 1 is in the raised position by the potentiometer 1P, thereby outputting the rack actuator 8 and controlling the electronic governor 2 by the normal control. Mode, and the engine output can be increased by increasing the rotation with an accelerator petal or the like.

When the hydraulic operating lever 1 is moved to the lowered position due to vibration or the like during traveling on the road, the rack actuator 8 is operated by the output from the controller 9 and the electronic governor 2 controls the engine E to operate. The rotation is reduced below a certain number. For this reason, the traveling speed and the conduction rotation of the working device 3 are reduced. In FIG. 3, the difference from the above example is that in the regulation control of the electronic governor 2, when the rotation speed of the engine E is limited to a certain value or less, and when the hydraulic operation lever 1 is operated to the raised position, The electronic governor 2 is controlled so that the rotation of the engine E is gradually increased without suddenly increasing. In the road running mode, the road running sensor 11 can detect a high-speed position. If the working device 3 is unexpectedly raised by the hydraulic operating lever 1, the vehicle body 4 suddenly moves forward at a high speed. In such a case, the engine E is controlled so as to gradually increase the rotation thereof, thereby achieving safe driving.

In FIG. 4, a mode changeover switch 20 for turning ON / OFF the control of the electronic governor 2 by the controller 9 is provided. This eliminates the inconvenience of being unable to run at high speed, for example, when it is not desired to change the operation position of the operation lever 1. In FIG. 5, a work implement attachment sensor 21 is provided at a work implement attachment part of the three-point link mechanism, and a controller 9 sends a signal to the effect that the work implement attachment sensor 21 connects the work implement to the electronic governor 2. Is automatically activated.

In FIG. 6, the hydraulic lock sensor 2
2 detects the hydraulic lock state, and automatically releases the regulation control of the electronic governor 2 by the controller 9, whereby the hydraulic pressure is locked and the working device 3 is being lowered, that is, is being lowered. Unnecessary regulation control of the electronic governor 2 in the absence state is released. In FIG. 7, only when the PTO sensor 24 detects that the PTO clutch is engaged, the electronic governor 2 is regulated and controlled. PTO
When the clutch is disengaged, it is determined that the work has been completed, and the regulation control is automatically released.

In FIG. 8, the control of the electronic governor 2 is controlled only when the automatic turning mode switch 27 is ON. When the mode switch 27 is turned OFF, the control is released. Turn on the automatic turning mode switch 27
When driving on a high-speed road with the vehicle turned,
It may operate unexpectedly, which is effective for preventing the body from overturning.

In FIG. 9, when the seat belt is worn, the seat belt switch 28 is turned on, and the control of the electronic governor 2 by the controller 9 is released. In FIG. 10, the output of the electronic governor 2 is controlled by the controller 9 only when the cabin door switch 29 is OFF, and the control is released when the cabin door switch 29 is ON. Prevents sudden opening of doors due to contact accidents, half-doors, etc. when driving on a highway.

[Brief description of the drawings]

FIG. 1 is a block diagram and a flowchart of an electronic governor control unit of an engine.

FIG. 2 is a side view of the tractor.

FIG. 3 is a flowchart showing another embodiment.

FIG. 4 is a control block diagram showing a partially different embodiment, and its flowchart.

FIG. 5 is a control block diagram showing a partially different embodiment, and its flowchart.

FIG. 6 is a control block diagram showing a partially different embodiment, and its flowchart.

FIG. 7 is a control block diagram showing a partially different embodiment.

FIG. 8 is a control block diagram showing a partially different embodiment.

FIG. 9 is a control block diagram showing a partially different embodiment.

FIG. 10 is a control block diagram showing a partially different embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic operation lever 2 Electronic governor 3 Work device 8 Rack actuator 19 Elevating switch E Engine

Claims (1)

[Claims] 1. A tractor that continuously raises and lowers a working device 3 through an operation of a switch 19 and performs position control for raising and lowering the working device 3 in accordance with an operation angle of a lever 1. An engine control device, such as a tractor, provided with a regulating means for restricting the rotation of the engine E from rising above a certain level until the lever 3 is moved to a certain raising position by operating the lever 1.