JP2010138887A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle capable of suppressing unnecessary high rotation of an engine without requiring troublesome returning operation of an acceleration lever. <P>SOLUTION: This working vehicle includes the engine E rotated and controlled by a control processing part 21 according to operation of the acceleration lever for holding rotation and an acceleration pedal for acceleration adjustment, and an auxiliary speed change mechanism 3 interposed in a traveling transmission system that receives power from the engine E and capable of operating to switch a vehicle speed range by a speed change lever 20, and a PTO configuring a working transmission system receiving power from the engine E. In this case, the control processing part 21 is configured so that condition control for decreasing the rotation of the engine E to a low speed rotation by an instruction from the acceleration lever can be applied by a switch S under the condition that the speed change lever 20 is neutral and the PTO is switched off or neutral. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work vehicle that operates a travel system and a work system device by holding an engine rotation by an accelerator lever and adjusting a speed increase by an accelerator pedal.

  As shown in Patent Document 1, an engine that is rotationally controlled by a control processing unit according to an accelerator lever for holding rotation and an accelerator pedal for adjusting speed increase to operate a traveling system and a work system, and this engine power 2. Description of the Related Art A work vehicle is known that includes a sub-transmission mechanism that is capable of switching a vehicle speed band by being interposed in a traveling transmission system that receives the power transmission system, and a PTO that constitutes the work transmission system.

In this work vehicle, the rotation of the engine is controlled according to the operation of the accelerator lever for maintaining the rotation and the accelerator pedal for adjusting the speed increase, and the vehicle speed band can be switched by being provided in a traveling transmission system that receives engine power. Since the sub-transmission mechanism and the PTO constituting the work transmission system are provided and the engine rotation is maintained by operating the accelerator lever in accordance with the work load, the field work can be continued under certain conditions.
JP 2008-144628 A

  However, since the engine rotation is held by the accelerator lever in the work vehicle, the engine remains at a high speed even when the PTO output is stopped in a stopped state. The inconvenience of operating the accelerator lever again according to the work load cannot be avoided when the lever is returned and the work is resumed. As a result, even if the load is light, the engine is wasted at high speed with noise and vibration. Had the problem of being continued.

  The problem to be solved is to provide a work vehicle that can suppress useless high-speed rotation of the engine without requiring a troublesome operation of returning the accelerator lever.

  According to the first aspect of the present invention, an engine whose rotation is controlled by a control processing unit in response to an operation of an accelerator lever for holding rotation and an accelerator pedal for adjusting speed increase, and a traveling transmission system that receives power from the engine are provided. Then, in a work vehicle including a sub-transmission mechanism capable of switching a vehicle speed band by a shift lever and a PTO constituting a work transmission system that receives power from the engine, the control processing unit is configured such that the shift lever is neutral, In addition, it is characterized in that a condition control for lowering the engine speed to a lower speed than the instruction of the accelerator lever can be applied by a switch on condition that the PTO is switched off or neutral.

  The control processing unit controls the rotation of the engine in accordance with the accelerator lever for maintaining the rotation and the accelerator pedal for adjusting the speed increase, and when the condition control is applied by the switch operation, when the vehicle is stopped by the neutral operation of the auxiliary transmission mechanism When the work implement is stopped by switching off the PTO or operating the lever neutrally, the engine rotation is controlled at a lower speed than the instruction of the accelerator lever.

According to a second aspect of the present invention, in the configuration of the first aspect, the control processing unit rotates the engine according to the operation of the accelerator pedal even when the engine is controlled at a low speed by applying the condition control. Is controlled to increase speed.
Even if the engine rotation is controlled at a low speed by the application of the condition control, the engine power is output according to the accelerator pedal operation.

The turn interlocking control type work vehicle of the present invention has the following effects.
The control processing unit of the work vehicle according to the first aspect of the invention controls the rotation of the engine according to the accelerator lever for maintaining the rotation and the accelerator pedal for adjusting the speed increase, and when the condition control is applied by the switch operation, When the work machine is stopped by the PTO switch-off or lever neutral operation when the vehicle is stopped by the neutral operation of the mechanism, the engine rotation is controlled at a lower speed than the instruction of the accelerator lever. Therefore, since the engine automatically rotates at a low speed in a light load state, the work vehicle can suppress unnecessary high-speed rotation of the engine without requiring a troublesome accelerator lever return operation.

  In addition to the effect of the first aspect, the work vehicle according to the second aspect of the invention enables engine output according to the accelerator pedal operation even when the engine speed is controlled at a low speed by applying condition control. It is possible to cope with work machine operation not based on PTO while the vehicle is stopped by hydraulic output or the like.

Below, the agricultural tractor by this invention is demonstrated based on drawing.
As shown in the side view of FIG. 1, the tractor 1 has an engine E mounted in a hood 2 at the front of the vehicle body, and transmits the rotational power of the engine E to various transmissions such as an auxiliary transmission mechanism in the transmission case 3. The rotational power decelerated by the transmission is transmitted to the left and right front wheels 4 and 4 and the left and right rear wheels 5 and 5.

  A cylinder case 8 is provided at the rear upper part of the transmission case 3 of the vehicle, and lift arms 9 are pivotally attached to the left and right sides of the cylinder case 8 so as to be rotatable. A hydraulic lifting cylinder 10 is housed in the cylinder case 8 as an actuator for lifting and lowering the rotary device R that is a ground working device. When hydraulic oil is supplied into the hydraulic lifting cylinder 10 via the ground working device raising electromagnetic valve, the lift arm 9 is turned up, and the hydraulic oil in the hydraulic lifting cylinder 10 is moved to the ground working device lowering electromagnetic valve. When it is discharged, the lift arm 9 is rotated downward. In the example of FIG. 1, the rotary device R for tillage work is connected as a ground work device, but other work machines such as a plowing work machine and a ski work machine may be connected.

  The rotary device R is connected via a three-point link mechanism including a top link 16 and a left and right lower link 17 at the rear of the vehicle body, and the left and right lift arms 9 and the lower link 17 are connected via a lift rod 18. The other lift arm 9 and the lower link 17 are connected via a rolling cylinder 30 so as to be adjustable in rolling.

  Further, a steering handle 6 for steering the left and right front wheels 4 and 4 to the left and right is provided in front of the cockpit 7, and a steering angle sensor 22 is provided at the rotating base as a means for detecting a turning operation of the vehicle body. .

  In addition, an operation panel 24 is provided on the side of the cockpit 7, and a ground work device lifting lever 19, a sub-shift switching gear shift lever 20, and a raising position setting device 13 for setting the height of the ground work device to be raised, In addition to providing an automatic lift switch 23 for switching application of auto-lift control for automatically raising the ground work device at the start of turning and automatic down control for automatically lowering the ground work device at the end of turning, a clutch pedal 25, a PTO switch 27s, Includes a forward / reverse lever.

  Further, below the cockpit 7, a slope sensor 15 for detecting the left and right inclination angle of the vehicle body and a control processing unit 21 for vehicle equipment control including the engine E are provided. The control processing unit 21 is a control system shown in FIG. As shown in the configuration diagram, a condition control application switch S, a sub-shift lever sensor 20p, a forward / reverse lever position detection switch 28p, a PTO switch 27s, a PTO lever sensor 27p, an accelerator pedal position sensor 14p, and a clutch pedal 25 are described below. A detection signal from the position sensor 25p, etc. and setting signals from various setting devices are input, the forward / reverse lever position detection switch 28p controls the forward / reverse clutches 28a and 28b, the PTO switch 27s controls the PTO clutch, and the PTO lever sensor 27p controls the PTO switch 27a and And controls the main clutch 25a by the position sensor 25p for Chipedaru 25, also has a configuration for controlling the engine throttle 1a in accordance with the conditions.

(Control processing)
The control processing in the control processing unit 21 includes condition control of the engine E that can be applied by the switch S, and when that application is selected, as shown in the basic pattern of engine rotation control in FIG. In addition, the engine rotation is controlled to a predetermined low rotation speed that is lower than the instruction of the accelerator lever at the start time T1 that satisfies the predetermined speed reduction condition, and returns to the original rotation at the return time T2 that deviates from the condition, Useless engine operation at low load can be suppressed without requiring troublesome operations.

  Specifically, as a predetermined speed reduction condition, as shown in the flowchart of the engine rotation control in FIG. 4, when the auxiliary transmission mechanism 3 is neutral and the PTO is switched off or neutral (S1, S3a, S3b) In addition, when the forward / reverse lever is neutral and the PTO is switched off or neutral (S2, S3a, S3b), when the clutch pedal 25 is depressed to disengage the clutch (S4), When the vehicle stops in the upcut state (S6), control is performed to a predetermined low rotation (S13).

  In this case, when the accelerator pedal is depressed during the low-speed control, the control process (S12, S12a) is configured to increase the speed with priority to the operation, so that the operation not depending on the PTO while the vehicle is stopped is performed. It can correspond to machine operation, for example, external hydraulic output.

  Further, when the above conditions are not satisfied in the case of the low speed control, the engine speed is controlled to increase (S22, S27) until returning to the original speed by the low speed control flag processing (S11, S21). . In particular, at the time of load recovery T3 when the PTO is restarted, the PTO clutch is connected after increasing the engine speed in order to prevent engine stall (S23 to S25a). Further, at the time of load recovery T3 when the forward / reverse lever is operated from the neutral position, the engine speed is gradually increased (S26, S27) while giving priority to the accelerator operation in order to prevent sudden start and to ensure safety. In a situation where the engine speed is difficult to increase with respect to the injection amount, the engine speed is increased faster than a predetermined ascending speed in order to counter the running load, as shown in another pattern of engine rotation control in FIG. By performing A (S28, S28a), engine stall can be prevented.

Next, a control setting system for a mobile agricultural machine including the work vehicle will be described.
As shown in the system configuration diagram of FIG. 5, the mobile farm machine control setting system is equipped with a control processing unit 31 by a controller equipped with a wireless communication interface such as Bluetooth on the mobile farm machine, and a personal key for discriminating each operator. Set to mobile phone 32. When the operator gets into the mobile farm machine and sets the mobile phone 32, the control process is configured to automatically set various control on / off according to the outputted personal key.

  By the above control process, when one mobile agricultural machine is used jointly by multiple people, it is automatically changed to the control setting state according to each individual, so that the labor of setting can be saved and the control is not forgotten. Work accuracy and work efficiency can be improved.

  In this case, by providing a setting call switch in the mobile agricultural machine so that the setting of each person (about 10 persons) can be set by operating the switch instead of the mobile phone 32, the mobile phone 32 is broken or not being carried. Can be handled. In addition, by providing a setting changeover switch 33 that can store several types of settings for each individual and can be switched with a single touch, work can be performed when multiple types of work are performed by one person and the on / off status of each work is different. The setting can be changed with a single touch.

  In addition, by providing an hour meter for each individual on the meter panel 34 and displaying the actual usage time for each individual, the maintenance cost burden for each person is determined according to the usage time when maintaining the aircraft for joint use. can do.

Side view of a tractor to which the control device of the present invention is applied Engine control system configuration diagram Engine control pattern diagram Flow chart of control processing Mobile farm machine control setting system configuration diagram

Explanation of symbols

1 Tractor (work vehicle)
1a Engine control unit 3 Mission case (sub transmission mechanism)
14p Accelerator pedal position sensor 20 Shift lever 20p Sub shift lever position sensor 21 Control processing section 25 Clutch pedal 25p Clutch pedal switch 27s PTO clutch switch 28 Forward / reverse lever 28p Forward / backward detection switch S Condition control application switch T1 At start T2 At return T3 When load is restored

Claims (2)

The engine (E) whose rotation is controlled by the control processing unit (21) according to the operation of the accelerator lever for maintaining the rotation and the accelerator pedal for adjusting the speed increase, and a traveling transmission system that receives power from the engine (E). In a work vehicle comprising: a sub-transmission mechanism (3) that is installed and capable of switching a vehicle speed band by a speed change lever (20); and a PTO that constitutes a work transmission system that receives power from the engine (E).
The control processing unit (21) switches the condition control to lower the rotation of the engine (E) to a lower speed than the instruction of the accelerator lever on the condition that the transmission lever (20) is neutral and the PTO is switched off or neutral. A work vehicle configured to be applicable by (S).   The control processing unit (21) controls to increase the rotation of the engine (E) according to the operation of the accelerator pedal even when the engine (E) is controlled at a low speed by application of condition control. The work vehicle according to claim 1.

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