JP4304583B2 - Shift control device for traveling vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift control device for a traveling vehicle such as an agricultural tractor.
[0002]
[Prior art]
Conventionally, a vehicle including an agricultural tractor is provided with a main transmission and a sub-transmission, and has a configuration capable of taking multiple shift positions, for example, all 24 stages. In order to simplify the switching operation of these multi-stage shift positions, in the tractor disclosed in Japanese Patent Application Laid-Open No. 2003-42288, when the subtransmission is operated, the shift position of the main transmission has been set to the highest so far. It is configured to automatically switch to a shift position having a long use time (by driving the actuator).
[0003]
[Patent Document 1]
JP 2003-42288 A (paragraph [0030])
[0004]
[Problems to be solved by the invention]
However, the tractor according to the above publication has a configuration in which the sub-transmission device can be set in three stages of “low”, “medium”, and “high”. Since the shift position can be switched to a long use time, for example, when the sub-shift shift position is set to the “low” position and the main shift shift position is set to the “2” speed position for a long time, Even if the operation is completed and the sub-shift position is set to “high” to travel on the road, the main transmission shifts to “2” speed, so that the main shift position needs to be switched to a higher speed.
[0005]
  In the tractor as described above, the main shift shift position is set to the highest position when traveling on the road even at the same auxiliary shift position, for example, the “high” position, while the main shift shift position is set to the lowest position in the loader operation. Since the main transmission shift position is switched to a specific position when the sub-transmission device is switched to “high”, a multi-stage operation can be performed for either work or traveling. Main shift shiftpositionSwitching operation occurred and was troublesome.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a shift control device for a vehicle that is suitable for a work with different vehicle speed zones and that can perform a quick automatic shift.
[0007]
[Means for Solving the Problems]
  The present invention solves the above problems by the following means.
  According to the first aspect of the present invention, there is provided an engine (11) provided on a vehicle body, a main transmission (41, 43) and a sub-transmission device (11) for transmitting the power of the engine (11) to the front and rear wheels (14, 13). 44), a main clutch (40) for turning on and off the power of the engine (11) to the main transmission (41, 43) and the auxiliary transmission (44), and a work machine connectable to the vehicle body (16) is a shift control device for a traveling vehicle, wherein the shift means of the main transmission device (41, 43) is operated to switch the designating means (75) for designating whether the vehicle is running or working. Main transmission manual operation means (36) for performing the above operation and auxiliary transmission manual switching means (for performing the switching operation of the shift position of the sub transmission (44)) (18) And sensors (70, 71, 72) for detecting the shift operation position, and the main transmission (41) for each of the designated running or working state and for each shift operation position of the auxiliary shift shift device (44). , 43) means (C) for measuring the set accumulated time and main shift shift position storage means (M) for storing the same,A forward / reverse switching lever (26) for switching the driving of the vehicle between forward, neutral and reverse;When the shift operation position of the auxiliary transmission (44) is switched, the main transmission (41, 43) is the main transmission with the longest usage time stored in the main transmission shift position storage means (M). Switch to main shift shift position of device (41, 43)When the forward / reverse switching lever (26) is moved forward again after operating the forward / reverse switching lever (26) to the reverse position to increase the speed, the output position of the main transmission (41, 43) Is the main shift position stored in the shift position storage means (M).A speed change control device for a traveling vehicle including a control means (30).
[0008]
  According to the second aspect of the present invention, there is provided an engine (11) provided on a vehicle body, a main transmission (41, 43) and a sub-transmission device (11) for transmitting the power of the engine (11) to the front and rear wheels (14, 13). 44), a main clutch (40) for turning on and off the power of the engine (11) to the main transmission (41, 43) and the auxiliary transmission (44), and a work machine connectable to the vehicle body (16), a shift control device for a traveling vehicle comprising: detecting means (31, 90) for detecting whether the vehicle is running or working; and a shift position of the main transmission (41, 43). Main transmission manual operation means (36) for switching operation, sub-transmission manual switching means (1819) for switching operation of the shift position of the sub-transmission device (44), and sensors (70, 71, 72) for detecting this shift operation position ) And detected Traveling or each working condition, and each auxiliary transmission shift position, and the main transmission means for measuring the set accumulated time of the device (41,43) (C) and the main transmission shift position storage means for storing this (M),A forward / reverse switching lever (26) for switching the driving of the vehicle between forward, neutral and reverse;When the shift operation position of the auxiliary transmission (44) is switched, the main transmission (41, 43) is the main transmission with the longest usage time stored in the main transmission shift position storage means (M). Switch to main shift shift position of device (41, 43)When the forward / reverse switching lever (26) is moved forward again after operating the forward / reverse switching lever (26) to the reverse position to increase the speed, the output position of the main transmission (41, 43) Is the main shift position stored in the shift position storage means (M).A speed change control device for a traveling vehicle including a control means (30).
[0009]
According to a third aspect of the present invention, the control means (30) switches the main shift shift position by the main shift manual operation means (36) while the auxiliary shift position (44) is set to neutral. In this case, after switching the sub shift shift position, the main shift shift position is given priority over the main shift shift position stored in the storage means (M) by the main shift manual operation means (36). 3. The traveling vehicle transmission according to claim 1, further comprising priority means for switching to a main shift position.
[0010]
【The invention's effect】
  According to the first aspect of the present invention, the set cumulative time of the main transmission (41, 43) is measured for each specified traveling or working state and for each shift operation position of the auxiliary transmission (44), and this is stored. So, even if you switch to the same sub shift shift position, the main shift shift position switches to the position with the longest usage time depending on whether you are using the vehicle for work or traveling, Multi-stage operation by the main transmission operation means (36) is not required.
  Further, when the forward / reverse switching lever (26) is moved to the forward side again after operating the forward / reverse switching lever (26) to the reverse position to increase the speed, the output of the main transmission (41, 43) Since the position is set to the main shift shift position stored in the shift position storage means (M), it is possible to return to the original main shift shift position simply by returning the forward / reverse switching lever (26) to the forward side after moving backward at high speed. If shifting can be performed automatically, the operation effort of traveling control is reduced.
[0011]
  Similarly, in the second aspect of the invention, the set cumulative time of the main transmission (41, 43) is measured for each detected traveling or working state and for each shift operation position of the auxiliary transmission (44). Since this is stored, the main shift shift position will be the position with the longest usage time depending on whether the vehicle is used for work or traveling even if the same sub shift shift position is switched. Since switching is performed, multi-stage operation by the main transmission operation means (36) is not required.
  Further, when the forward / reverse switching lever (26) is operated to the reverse position to increase the speed and then the forward / reverse switching lever (26) is moved forward again, the output of the main transmission (41, 43). Since the position is set to the main shift shift position stored in the shift position storage means (M), it is possible to return to the original main shift shift position simply by returning the forward / reverse switching lever (26) to the forward side after moving backward at high speed. If shifting can be performed automatically, the operation effort of traveling control is reduced.
[0012]
According to a third aspect of the present invention, when the main shift shift position is switched by the main shift manual operation means (36) while the shift position of the auxiliary transmission (44) is set to neutral. The main shift shift position is switched by the main shift manual operation means (36) after the sub shift shift position is switched, with the main shift shift position having priority over the main shift shift position stored in the storage means (M). Since the position can be switched to the position, the main shift shift position does not switch against the operator's intention, and the operation by the main shift manual operation means (36) is not required as in the above, and the operability of the vehicle is improved. be able to.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a side view of an agricultural tractor 10 as an example of a vehicle, and FIG. 2 shows a perspective view of an operation unit of a transmission near the driver's seat 17.
[0014]
The engine 11 is mounted on the front of the vehicle body, and the rotational power of the engine 11 is appropriately shifted by various transmissions in the transmission case 12 as will be described later, and then transmitted to the rear wheel 13 or the front and rear wheels 14 and 13. It is composed. A working machine 16 such as a rotary is pulled through the link device 15 to the rear part of the vehicle body.
[0015]
Further, in the vicinity of the driver's seat 17, various levers such as a shift lever 18 for performing a shift operation, a position lever 19 for changing the height of the work implement 16, and a throttle lever 94 for adjusting the opening of the engine throttle valve, Various switches such as a tilling depth control switch 20 and a turning control switch 21 are provided. A handle post 24 is provided in front of the driver seat 17, and a steering handle 25 is attached to the handle post 24. By rotating the steering handle 25, the front wheel 14 which is a steered wheel turns and the vehicle body turns.
[0016]
Further, a forward / reverse switching lever 26 projects from the side surface of the handle post 24, a meter panel 27 is provided in front of the steering handle 25, and a clutch pedal 28 (for entering / disconnecting the main clutch 40) is provided below the steering handle 25. ), Pedals such as an accelerator pedal 95 and a left and right brake pedal (not shown) for adjusting the opening of the engine throttle valve are provided.
[0017]
The shift lever 18 protrudes upward from an “h” -shaped lever guide 34 and has three shift shift positions of “high speed”, “medium speed”, and “low speed”. 34, the auxiliary transmission device 44, which will be described later, is manually switched to “high speed”, “medium speed”, or “low speed” via the link mechanism. In addition, the gripping portion of the transmission lever 18 has a pair of main transmission shift positions, in which the first main transmission device 41 and a second main transmission device 43 described later are combined in combination, up or down from the current position. A shift operation unit 36 (36a, 36b) including a momentary switch is provided.
[0018]
The speed change operation unit 36 is provided with a pair of momentary switches 36a and 36b in the vertical direction to give an up or down command. The shift shift position indicator 38 is provided on the meter panel 27 in front of the steering wheel, and indicates where the current position of the main shift shift position obtained by combining the first main transmission 41 and the second main transmission 43 is combined. indicate. The indicator 38 simultaneously displays the current position of the main shift shift position obtained by combining the first main transmission 41 and the second main transmission 43 and the current position of the sub shift shift position of the sub transmission 44. You may do it. As will be described later, the first main transmission 41 has two shift shift positions, high and low, and the second main transmission 43 has at least three shift shift positions, in this embodiment, four shift shift positions. Accordingly, the four stages of the second main transmission 43 can be switched between high and low, and the main shift shift position where the first main transmission 41 and the second main transmission 43 are combined in cooperation is at least six stages. As described above, in the present embodiment, there are eight shift shift positions (first to eighth speeds), and the sub-transmission device 44 has three sub-shift shift positions.
[0019]
3 is a diagram of a power transmission system, FIG. 4 is a hydraulic circuit diagram, and FIG. 5 is a block diagram of a shift control system. The rotational power of the engine 11 is intermittently operated by the main clutch 40 in the clutch housing, and sequentially the first main transmission 41, the forward / reverse switching device 42, the second main transmission 43, and the auxiliary transmission in the transmission case 12. 44 is configured to transmit to 44.
[0020]
The first main transmission 41 is a transmission having a wet multi-plate Hi-Lo clutch 47 for switching between the two gear sets 45 and 46 of “high speed” and “low speed”, and is controlled by the controller 30 which is a control means. When the Hi-Lo clutch valve 48 is switched to the “high speed” position, the Hi-Lo clutch 47 is “on” to the Hi side, and the power is transmitted at a “high speed” through one gear set 45. Further, when the Hi-Lo clutch valve 48 is switched to the “low speed” position, the Hi-Lo clutch 47 becomes “on” to the Lo side, and the other gear set 46 having a higher reduction ratio than the one gear set 45. Power is transmitted at "low speed" via As described above, the first main transmission 41 has two shift shift positions, high and low, and the rotational power changed by the first main transmission 41 is transmitted to the forward / reverse switching device 42.
[0021]
The forward / reverse switching device 42 is a transmission having a wet multi-plate forward / reverse clutch 51 that switches between two gear sets 49 and 50, “forward” and “reverse”, and the aforementioned forward / reverse switching lever 26 is moved forward. When operated, the forward operation position switch 52 is turned on, a signal is sent from the controller 30 to the forward solenoid of the forward / reverse valve 54, and the forward clutch of the forward / reverse clutch 51 is turned "ON", and one of the gear sets Power is transmitted to the second main transmission 43 through the forward rotation through 49.
[0022]
On the other hand, when the forward / reverse switching lever 26 is operated to the reverse side, the reverse operation position switch 53 is turned on, and a signal is sent from the controller 30 to the reverse solenoid of the forward / reverse valve 54, and the forward / reverse clutch 51 The reverse clutch is “ON”, and the power is transmitted to the second main transmission 43 by the reverse rotation through the other gear set 50 including the counter gear. When the forward / reverse switching lever 26 is in the neutral position, both the forward operation position switch 52 and the reverse operation position switch 53 are turned off, the forward / reverse clutch 51 is turned off, the rotational power is cut off, and the second main speed change is performed. Not transmitted to device 43.
[0023]
The second main transmission 43 is a synchromesh gear transmission having four gear sets, and the rotational power output from the forward / reverse switching device 42 is transmitted from the upper power side to the fourth speed gear set 56 and the third speed gear set. 57, and transmitted to the auxiliary transmission 44 through one of the second gear set 58 and the first gear set 59. A shifter ring having a synchromesh mechanism is provided between the drive side gears of the 4-speed gear set 56 and the 3-speed gear set 57, and this shifter ring is slid back and forth by expansion and contraction of the first speed change hydraulic cylinder 60 which is a speed change actuator. Similarly, a shifter ring having a synchromesh mechanism is provided between the drive side gears of the second speed gear set 58 and the first speed gear set 59, and this shifter ring is a shift actuator. The two-speed hydraulic cylinder 61 is configured to slide back and forth by expansion and contraction.
[0024]
When a signal is sent from the controller 30 to the fourth speed solenoid of the main shift “3-4 speed” valve 62, power is transmitted through the fourth speed gear set 56 due to the extension of the first shift hydraulic cylinder 60. 4th speed ", and when a signal is sent to the 3rd speed solenoid of the main shift" 3-4th speed "valve 62, power is transmitted through the 3rd speed gear set 57 due to the contraction of the first shift hydraulic cylinder 60. To “3rd speed”. Further, when a signal is sent from the controller 30 to the second speed solenoid of the main speed change “1-2 speed” valve 63, the power is transmitted through the second speed gear set 58 by the extension of the second speed change hydraulic cylinder 61. Thus, when a signal is sent to the first-speed solenoid of the main shift “1-2-speed” valve 63, the power is transmitted via the first-speed gear set 59 due to the contraction of the second shift hydraulic cylinder 61. It is transmitted to “1st speed”. Thus, the second main transmission 43 has four speed shift positions from “1st speed” to “4th speed”, and the rotational power shifted by the second main transmission 43 is sub-transmission. 44.
[0025]
The sub-transmission device 44 is a sliding mesh gear type transmission device that is switched through a link mechanism by manual operation of the transmission lever 18, and includes “low speed” and “medium speed” gear sets 65 and 66, and “high speed” ( It has three shift shift positions with the gear set 67 (directly connected). The rotational power changed by the second main transmission 43 is further changed by the auxiliary transmission 44.
[0026]
Here, the second main transmission 43 includes a main shift “1-N-2 speed” position sensor 68 and a main shift “3-N-4 speed” position sensor 69 as means for detecting a gear combination. The sub-transmission device 44 is provided with a sub-transmission “low-speed” position sensor 70, a sub-transmission “medium-speed” position sensor 71, and a sub-transmission “high-speed” position sensor 72 as means for detecting a gear combination. Yes.
[0027]
Detection signals of these sensors 68 to 72 are sent to the controller 30 (having the central processing unit C and the memory M) shown in FIG. The controller 30 includes a lift arm angle sensor 31 that detects the height of the work implement, a clutch pedal sensor 73 that detects a depression operation of the clutch pedal 28, a vehicle speed sensor 74 that detects the traveling speed of the vehicle body, and the vehicle body is in a traveling state. A travel / work changeover switch 75 as means for designating or detecting whether the engine is in a working state, a rotation sensor 97 for detecting the engine speed, a throttle position sensor 98 for detecting the opening of a throttle valve by an accelerator pedal (not shown), A steering sensor 100 for detecting the steering angle of the steering wheel is provided.
[0028]
Here, the state of the vehicle is designated by the switching operation of the travel / work switching switch 75, which is a designation means, whether the operator himself is in a state of traveling on a general road or in a state of working traveling on a farm field or the like. However, instead of this, a means for detecting the state of the operating part of the vehicle may be provided to distinguish whether the vehicle is in a state of traveling on a general road or in a state of working on a field or the like. For example, a method of detecting the on / off state of the PTO switch 90 to “working” when it is “on” and a non-working state (running state) when “off”; There is a method of making the state non-working when rising.
[0029]
Further, as shown in the hydraulic circuit diagram shown in FIG. 4, a lift cylinder 76 that raises and lowers the work machine 16, a power steering device 77 that operates by rotating the steering handle 25, and the power transmitted to the front wheels 14 is “constant speed” or “ 4WD switching clutch 78 for switching to "acceleration", left and right brake cylinders 79L, 79R for independently braking left and right rear wheels 13L, solenoid 91 for lift arm raising control valve, solenoid for lift arm lowering control valve 92 is provided.
[0030]
Then, the rotational power changed by the auxiliary transmission 44 is decelerated by the reduction gear 82 of the rear axle via the rear differential device 81 (FIG. 3), and the rear wheel 13 is driven. Further, the rotational power changed by the auxiliary transmission 44 is also transmitted to the four-wheel drive switching clutch 78, and after being switched to “constant speed” or “acceleration” by the four-wheel drive switching clutch 78, the front differential device. After 84, the vehicle is decelerated by the reduction gear 85 of the front axle, and the front wheels 14 are driven. Further, the rotational power of the engine 11 is branched into the PTO system at the front stage of the main clutch 40, is connected to the PTO clutch 86, and is sequentially projected through the PTO reverse rotation device 87 and the PTO transmission device 88 to the rear of the vehicle body. It is transmitted to the PTO take-out shaft 89.
[0031]
Thus, as shown in FIG. 6, the first main transmission 41 and the second main transmission 43 are linked to obtain the eight-speed main shift position, and the sub-shift shift position of the sub-transmission 44 is further set to three. Can be combined to obtain a 24-speed shift position. For example, if the Hi switch 36a of the speed change operation unit 36 is pressed when the main shift shift position is "first stage", the main shift shift position is increased to "second stage" and the main shift shift position is " If the Lo switch 36b of the speed change operation unit 36 is pressed at the “6th speed”, the main shift shift position is lowered to the “5th speed”, and when the main shift shift position is the “5th speed”, the deceleration switch If the pressing operation is performed on 36b, the main shift shift position is lowered to the “fourth stage”.
[0032]
In addition, the transmission control device of the present embodiment is a manual operation in which an instruction to up or down the transmission is made manually by turning on / off the pair of momentary switches 36a, 36b of the transmission operation unit 36 described above. When the drive mechanism and the sub-transmission device 44 (not shown) are at “H”, the transmission device operates at an appropriate traveling speed in conjunction with the accelerator operation (depressing the accelerator pedal 95 and releasing the depression or operating the throttle lever 94, etc.). An automatic drive mechanism that is automatically set by the controller 30 is provided.
[0033]
When the sub-transmission device 44 is at “H”, the engine speed changes due to depression of the accelerator pedal 95 and release, and the gear position corresponding to the engine speed is automatically set to “H”. A gear position within the range from “1” to “4” speed is set. Further, even when the throttle lever 94 is operated, a gear position within the range from “1” to “4” speed of “H” corresponding to the operation position of the lever 94 is set.
[0034]
Further, the structure of the transmission according to the present invention is a means for storing the main shift shift position having the longest usage time of the main transmissions 41 and 43 excluding on-road travel (the shift shift position frequently used during work is stored). Means: for example, a memory M in the controller 30), and when the vehicle body is designated to work by the travel / work changeover switch 75, the automatic transmission of the main transmission 41, 43 when the auxiliary transmission 44 is switched. The shift shift position is a frequently shifted shift position stored in the storage means. The shift shift position that is frequently used during this work can be determined by the controller 30 by calculating the accumulated time. In this way, since the target shift shift position can be instantaneously operated, the number of operations of the pair of momentary switches 36a and 36b of the shift operation unit 36 can be reduced to reduce the operator's operation effort. The accumulated time is reset every time the engine is started.
[0035]
For example, the rotary work with a relatively small torque is performed at the low speed stage and the main transmissions 41 and 43 are mainly operated at “2nd to 4th speed”, while the plow work with a relatively large torque is performed by the auxiliary transmission 44. The main transmissions 41 and 43 are mainly operated at "1 to 2 speeds" at a low speed.
[0036]
Thus, even if the sub-shift shift position is the same, the shift positions of the main transmissions 41 and 43 that are frequently used differ from work to work. For example, after the sub-shift is switched to low speed (L), the main gear can be switched by the controller 30. The shift position of the shift shifts, and the operation of the acceleration / deceleration switch is required again.
[0037]
Therefore, in the embodiment of the present invention, the following configuration is adopted in order to reduce the subsequent operation of the acceleration / deceleration switch when the auxiliary transmission is switched.
That is, as shown in the flowcharts of FIGS. 7, 8, and 9, the main transmissions 41 and 43 are set for each work mode and for each sub-shift shift position of “L”, “M”, and “H”. When the sub-transmission device 44 is operated by counting the cumulative use time of the main shift shift position, the main shift shift position immediately after the operation of the lever 18 at the main shift shift position with the longest use time is immediately A memory M for storing the main shift position to be output is provided. The memory M may be a separate memory for each work mode, or a separate memory area for storing the main shift shift position for each work mode may be provided in a single memory.
[0038]
In this way, by providing the memory M for storing for each work mode and for each sub shift shift position, for example, in the rotary work (depth mode) and the plow work (draft mode), each work mode can be supported. Since the main shift shift position in the vehicle speed range can be stored, it is possible to work in the vehicle speed range suitable for each. The flowchart of FIG. 8 shows a case where the rotary work is selected.
[0039]
FIG. 10 shows an example of the accumulated use time data of the main shift shift position for travel. FIGS. 11 and 12 show the accumulated use time data of the main shift shift position for rotary work and plow work. Each example is shown.
[0040]
Further, as shown in the flow of FIG. 9, when the main transmission shift position is switched by the main transmission increase / decrease switch 36a, 36b while the shift position of the auxiliary transmission 44 is set to neutral, After the sub shift shift position is switched, the main shift shift position is switched over to the main shift shift position by the acceleration / deceleration switches 36a and 36b in preference to the main shift shift position stored in the memory M.
[0041]
As a result, the main shift shift position does not switch against the operator's intention, and no undue acceleration / deceleration switches 36a and 36b are required as described above, and the operability of the vehicle can be improved.
[0042]
As another form of the travel / work switching switch 75, a plurality of states such as travel / loader work / rotary work / plow work may be designated. The accumulated usage time may be counted in the state of each vehicle.
[0043]
Further, when the forward / reverse switching lever 26 is moved to the forward side again after operating the forward / reverse switching lever 26 to the reverse position to increase the speed, the output positions of the main transmission devices 41 and 43 are the shift position storage means. The main shift shift position stored in (1) may be used.
[0044]
Conventionally, the output position of the main transmissions 41 and 43 has not been changed by operating the forward / reverse switching lever 26. In this case, the work is performed while moving forward again after high-speed back in the tillage work such as in a deformed field. If the forward / reverse switching lever 26 is moved backward to increase the speed and back, then when the work is resumed due to forward movement, the work is performed again by decelerating to the original position. It was annoying.
[0045]
Therefore, as described above, if the shift can be automatically made to the original main shift position by simply returning the forward / reverse switching lever 26 to the forward side after the vehicle has moved backward at a high speed, the operation effort for traveling control is reduced.
[0046]
As another embodiment of the present invention, when the transmission lever 18 is in the neutral position, the output position of the original main transmission devices 41 and 43 is automatically set as the main transmission shift position for a predetermined time. The indicator 38 may be configured to display as shown in FIG. At that time, as shown in the flowchart of FIG. 14, if the sub-shift shift position of the sub-transmission device 44 remains neutral even after a certain period of time has elapsed since the shift lever 18 is in the neutral state, the main transmission 41 , 43 is also set to “neutral”, and the indicator 38 is desirably displayed as “neutral”.
[0047]
Conventionally, when the sub shift shift position is neutral, no position of the main shift shift position is displayed. Therefore, when the sub shift shift position is no longer neutral after a while, the main shift shift position has been Forgetting which gear position the shift shift position was working on, it was difficult to adjust the work speed again as before.
[0048]
However, as described above, even when the sub-shift shift position is unexpectedly changed, the previous main shift shift position is displayed, so that the main shift shift position can be easily restored to the original position.
[0049]
Further, as shown in the indicator surface of FIG. 15 and the flowchart of FIG. 16, when the shift lever 18 in the “neutral” position is no longer in the “neutral” position, the main shift shift position most corresponding to the sub shift shift position. The indicator 38 may be blinked only for a certain period of time and then lighted up.
[0050]
When the number of shifts increases, it is necessary to search for a suitable main shift shift position at the time of work. However, it becomes easy to recognize by blinking the main shift shift position, and after a certain time elapses, it becomes lit and becomes unobtrusive.
[0051]
In addition, when the sub-shift shift position is changed, when having a function of automatically shifting to the stored main shift shift position, the stored shift shift position (main shift shift position to be performed from now), The display method of the actual main shift position is displayed on the indicator 38 in a different state (for example, the stored main shift position is blinked and the actual main shift position is highlighted). The speed of the vehicle being operated can be known at a glance and can be operated with peace of mind, and when the stored shift shift position changes, the shift shift position after the change can be easily understood. At this time, the main shift shift position can be switched by turning on the acceleration / deceleration switch 36 before changing the sub shift shift position.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a speed change lever of the tractor of FIG. 1;
FIG. 3 is a diagram of a power transmission system of the tractor of FIG.
FIG. 4 is a hydraulic circuit diagram of the power transmission system of the tractor of FIG.
FIG. 5 is a block diagram of a transmission control system for the tractor of FIG. 1;
FIG. 6 is a diagram showing a shift shift position of the transmission device for the tractor of FIG. 1;
FIG. 7 is a view showing a shift control flowchart of the tractor of FIG. 1;
FIG. 8 is a diagram showing a shift control flowchart of the tractor of FIG. 1;
FIG. 9 is a diagram showing a shift control flowchart of the tractor of FIG. 1;
FIG. 10 is a diagram showing an example of an accumulated usage time of a main shift shift position for traveling of the tractor of FIG. 1;
FIG. 11 is a diagram showing an example of accumulated usage time data of a main shift shift position for rotary work of the tractor of FIG. 1;
FIG. 12 is a diagram showing an example of accumulated usage time data of the main shift shift position for the plow work of the tractor of FIG. 1;
13 is a front view showing an indicator on the operation panel of the tractor of FIG. 1. FIG.
FIG. 14 is a diagram showing a shift control flowchart of the tractor of FIG. 1;
FIG. 15 is a front view showing an indicator on the operation panel of the tractor of FIG. 1;
FIG. 16 is a diagram showing a shift control flowchart of the tractor of FIG. 1;
[Explanation of symbols]
10 Agricultural tractors 11 Engines
12 Mission case 13 Rear wheel
14 Front wheel 15 Link device
16 Working machine 17 Driver's seat
18 Shift lever 19 Position lever
20 Cutting depth control switch 21 Turning control switch
24 Handle post 25 Steering handle
26 Forward / backward switching lever 27 Meter panel
28 Clutch pedal 30 Controller
31 Lift arm angle sensor 34 Lever guide
36 Speed change operation part 36a Speed increase switch
36b Deceleration switch 38 Indicator
40 main clutch 41 first main transmission
42 Forward / reverse switching device 43 Second main transmission
44 Sub-transmission 45 “High-speed” gear set
46 “Low Speed” Gear Set 47 Hi-Lo Clutch
48 Hi-Lo clutch valve
49 “Forward” gear set 50 “Forward” gear set
51 Forward / reverse clutch 52 Forward operation position switch
53 Reverse operation position switch 54 Forward / reverse valve
56 4-speed gear set 57 3-speed gear set
58 2-speed gear set 59 1-speed gear set
60 Hydraulic cylinder for first speed change 61 Hydraulic cylinder for second speed change
62 Main transmission "3-4 speed" valve 63 Main transmission "1-2 speed" valve
65 "Low speed" gear set 66 "Medium speed" gear set
67 "High speed" (direct connection) gear set
68 Main transmission "1-N-2 speed" position sensor
69 Main transmission "3-N-4 speed" position sensor
70 Sub-shift “low speed” position sensor 71 Sub-shift “medium speed” position sensor
72 Sub-speed “high speed” position sensor 73 Clutch pedal sensor
74 Vehicle speed sensor 75 Travel / work switch
76 Lift cylinder 77 Power steering device
78 4WD switching clutch 79 Brake cylinder
81 Rear differential device 82 Rear axle reduction gear
84 Front differential device
85 Front axle reduction gear 86 PTO clutch
87 PTO reverse gear 88 PTO transmission
89 PTO take-out shaft 90 PTO switch
91 Solenoid for lift arm lift control valve
92 Solenoid for lift arm lowering control valve
94 Throttle lever 95 Accelerator pedal
97 Rotation sensor 98 Throttle position sensor
100 Steering sensor
C Central processing unit M Memory

Claims (3)

A transmission comprising an engine (11) provided on the vehicle body, and a main transmission (41, 43) and a sub-transmission (44) for transmitting the power of the engine (11) to the front and rear wheels (14, 13); The main transmission (41, 43) and the auxiliary transmission (44) are provided with a main clutch (40) for turning on and off the power of the engine (11) and a work machine (16) connectable to the vehicle body. A shift control device for a vehicle,
Designation means (75) for designating whether the vehicle is running or working;
Main shift manual operation means (36) for switching the shift position of the main transmission (41, 43);
Sub-shift manual switching means ( 18 ) for switching the shift position of the sub-transmission device (44), and sensors (70, 71, 72) for detecting the shift operation position;
Means (C) for measuring the set accumulated time of the main transmission (41, 43) for each designated traveling or working state and for each shift operation position of the auxiliary transmission shift device (44), and storing this. Main shift shift position storage means (M);
A forward / reverse switching lever (26) for switching the drive between forward, neutral and reverse ;
When the shift operation position of the auxiliary transmission (44) is switched, the main transmission (41, 43) is stored in the main shift shift position storage means (M) and has the longest usage time. When switching to the main shift shift position (41, 43) , operating the forward / reverse switching lever (26) to the reverse position to increase the speed, and then moving the forward / reverse switching lever (26) to the forward side again, The vehicle transmission control apparatus includes a control means (30) for setting the output position of the main transmission (41, 43) to a main shift position stored in the shift position storage means (M). . A transmission comprising an engine (11) provided on the vehicle body, and a main transmission (41, 43) and a sub-transmission (44) for transmitting the power of the engine (11) to the front and rear wheels (14, 13); The main transmission (41, 43) and the auxiliary transmission (44) are provided with a main clutch (40) for turning on and off the power of the engine (11) and a work machine (16) connectable to the vehicle body. A shift control device for a vehicle,
Detecting means (31, 90) for detecting whether the vehicle is running or working;
Main shift manual operation means (36) for switching the shift position of the main transmission (41, 43);
Sub-shift manual switching means (1819) for switching the shift position of the sub-transmission device (44), and sensors (70, 71, 72) for detecting the shift operation position;
Means (C) for measuring the set accumulated time of the main transmission (41, 43) and main shift shift position storage means (M) for storing the set cumulative time of the main transmission (41, 43) for each detected traveling or working state and for each sub shift shift position. )When,
A forward / reverse switching lever (26) for switching the drive between forward, neutral and reverse ;
When the shift operation position of the auxiliary transmission (44) is switched, the main transmission (41, 43) is stored in the main shift shift position storage means (M) and has the longest usage time. When switching to the main shift shift position (41, 43) , operating the forward / reverse switching lever (26) to the reverse position to increase the speed, and then moving the forward / reverse switching lever (26) to the forward side again, The vehicle transmission control apparatus includes a control means (30) for setting the output position of the main transmission (41, 43) to a main shift position stored in the shift position storage means (M). .   When the main shift shift position is switched by the main shift manual operation means (36) while the sub shift shift position (44) is set to neutral, the control means (30) After the shift position is switched, priority means for switching the main shift shift position to the main shift shift position by the main shift manual operation means (36) in preference to the main shift shift position stored in the storage means (M). The transmission apparatus for a traveling vehicle according to claim 1 or 2, further comprising:

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