JP2004251351A - Running speed change control device of agricultural tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a running speed change control device of an agricultural tractor capable of performing gear shift to a gear position corresponding to the condition without troublesome speed adjustment. <P>SOLUTION: The running speed change control device 1 of an agricultural tractor comprises a main speed change mechanism d having a plurality of gear positions capable of selecting the transmission gear ratio for a vehicle speed zone in service among a plurality of vehicle speed zones set to be in a speed change range by a running transmission, and a speed change command means to command the speed change of the gear position of the main speed change mechanism d. The speed change command means has an automatic gear change means to count (S7) the maintenance time of the gear position selected when a machine runs, store (S11) the longest gear position when the service of each vehicle speed zone is completed, and command (S12) the speed change to the gear position related to the storage when the corresponding vehicle speed zone is used next. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a traveling speed control device for an agricultural tractor, and more particularly, to a traveling speed control device for an agricultural tractor capable of performing work efficiently by enabling appropriate automatic shifting in work traveling without troublesome speed adjustment operation. About.
[0002]
[Prior art]
An example in which a shift control device for an agricultural tractor performs shift control so as to automatically shift in a vehicle speed range selected by an operation lever is known as in Patent Document 1.
In detail, the above-mentioned transmission control device comprises a sub-transmission mechanism capable of manually switching three stages of a low-speed operation L for operation, a high-speed operation during operation M, and a road operation H by an auxiliary transmission lever. An automatic main transmission mechanism capable of switching between a plurality of gear ratios is provided. By operating a main speed changeover switch for increasing or decreasing the gear ratio, it is possible to select from a multi-stage gear position of a transmission gear ratio in a wide range from work use to road use. In addition, by providing an automatic shift function that shifts in accordance with the engine speed under certain conditions, automatic shifting can be performed in response to accelerator operation, so that troublesome gear position shift operations can be avoided. Operability can be improved.
[Patent Document 1] Japanese Patent Application Laid-Open No. Hei 9-16621.
[Problems to be solved by the invention]
However, the above-described shift control device requires the operator to operate the automatic main transmission mechanism by one-step changeover switch to a work speed position suitable for the user according to the work content and the preference of the worker. Since the accelerator adjustment is required, the trouble of speed adjustment cannot always be avoided.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling speed control device for an agricultural tractor capable of shifting to a gear position corresponding to a situation without requiring cumbersome speed adjustment.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is a multi-stage gear capable of selecting a transmission gear ratio for a used vehicle speed band among a plurality of vehicle speed bands set in a shift range of a traveling transmission. In the traveling speed change control device for an agricultural tractor, comprising: a main transmission mechanism having a position; and a shift instruction means for instructing a shift of a gear position of the main transmission mechanism. The position maintaining time is counted, and the longest gear position is stored as an automatic shift position at the end of use of each vehicle speed band, and the corresponding vehicle speed band is stored at the next use of the corresponding vehicle speed band. It is characterized by comprising automatic shifting means for instructing shifting.
[0006]
The shift instructing means stores the longest gear position for each vehicle speed band as an automatic shift position for each vehicle speed band from the counted by the automatic transmission means, and stores the corresponding vehicle speed band as the last longest use when the vehicle speed band is switched. The selected gear position is selected and the speed is adjusted, so that the vehicle speed that has been used the longest in the work is obtained in association with the vehicle speed band.
[0007]
The invention according to claim 2 is characterized in that the automatic transmission means counts each of the maintenance times of the gear position during the traveling of the vehicle in each of the stroke sections in which the upshifting step and the downshifting step of the vehicle speed band are distinguished. , Storing and shifting. The automatic transmission means stores the gear position and issues a gear change command separately for the shift-up process and the shift-down process in the vehicle speed band, so that the vehicle speed suitable for the work can be obtained in association with the shift direction in the vehicle speed band. .
[0008]
The invention according to claim 3 is characterized in that the automatic transmission means counts a maintenance time excluding a time during which the traveling of the aircraft is stopped. Since the actual time is counted only during the traveling operation by the automatic transmission means, a gear position corresponding to the actual traveling operation is selected.
[0009]
The invention according to claim 4 is characterized in that the automatic transmission means counts, stores, and shifts in each of the direction sections in which the maintenance time of the gear position during the traveling of the vehicle is distinguished between forward traveling and reverse traveling. It is characterized by performing. Since the gear position is instructed by the automatic transmission means to distinguish between forward travel and reverse travel, the vehicle speed is adjusted to the vehicle speed associated with forward and backward travel.
[0010]
The invention according to claim 5 is characterized in that the automatic transmission means instructs a shift of a gear position in accordance with an accelerator operation when a vehicle speed band for traveling on a road is used. The automatic shifting means issues a shift command in accordance with an accelerator operation during traveling on the road, so that it is possible to cope with normal traveling on the road.
[0011]
In the invention according to claim 6, the automatic transmission means instructs a shift to a stored gear position at the time of engine start, and starts counting a maintenance time of the selected gear position from the time of engine start, In addition, when storing the automatic shift position, the corresponding maintenance time is included, and the storage is similarly changed for gear positions in which the maintenance time during counting exceeds the stored maintenance time. The automatic transmission means starts counting when the engine is started, and stores a new gear position as an automatic transmission position based on the result of the count. The storage of the automatic shift position is also changed according to the maintenance time.
[0012]
【The invention's effect】
The traveling speed control device for an agricultural tractor according to the present invention has the following effects.
The traveling speed control device of the agricultural tractor having the above-described configuration, when the vehicle speed band is switched by the automatic transmission means, the speed is adjusted according to the previous longest use result of the corresponding vehicle speed band. Since the vehicle speed that has been used for the longest operation can be obtained in association with the operation, the operator is freed from the trouble of speed adjustment by repeating the shift of the main transmission gear position, which is required every time the vehicle speed band is switched, and the efficiency is improved. I can work well.
[0013]
When the speed of the automatic shifting means is adjusted for each shift direction of the vehicle speed band, various operations in each vehicle speed band are associated with the shift direction. I can work well.
[0014]
If the automatic transmission means is to be counted only during the traveling operation, the gear position corresponding to the actual traveling operation is selected, so that the clutch is disengaged or the aircraft is stopped such as reverse neutral. Work can proceed efficiently by speed control based on the actual running work excluding the state.
[0015]
In the case where the automatic shift means is configured to issue a gear position shift command separately for forward traveling and reverse traveling, the vehicle speed is associated with the traveling direction in each vehicle speed band, so that a fine-grained operation corresponding to the work mode is performed. Work can proceed efficiently with speed control.
[0016]
In the case where the automatic transmission means performs a shift process in accordance with an accelerator operation when traveling on the road, a gear position suitable for normal traveling on the road is selected. , It is possible to ensure an appropriate traveling speed change without being affected by traveling.
[0017]
If the automatic shift means is reset every time the engine is restarted to change the storage of the automatic shift position, and if the storage is changed according to the gear position maintenance time even during the current work, the operation is When the content changes from tilling to scraping, it is possible to respond quickly without affecting the work time in the past (at the time of tilling) for a long time.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment specifically configured based on the above technical idea will be described below with reference to the drawings.
[0019]
The traveling speed change control device according to the present invention is applied to speed change control of a traveling transmission of an agricultural tractor. As shown in the side view of FIG. 1, the agricultural tractor includes a front wheel a and a rear wheel b at front and rear portions of the fuselage, respectively, and transmits rotational power of an engine c mounted in a hood to a transmission in a transmission case. The power which is appropriately decelerated by the transmission is transmitted to the front wheels a and the rear wheels b. The transmission is composed of a main transmission mechanism d and an auxiliary transmission mechanism e, as will be described later. In some cases, as shown in the power transmission diagram of FIG. 2, a hydraulic high / low switching mechanism f is provided immediately before these transmission mechanisms. It may be provided. The sub-transmission mechanism e switches by operating a shift lever (sub-transmission lever) 3 described later in the front-rear direction, and the main transmission mechanism d operates a speed-up switch 3a and a deceleration switch 3b provided on a handle of the shift lever 3. To switch.
As shown in FIG. 2, the agricultural tractor is provided with a forward / reverse switching mechanism g for switching the traveling direction of the aircraft forward and backward in the traveling transmission system, and a reverse lever (forward / reverse switching lever) below the steering handle h. ) The body can be moved forward or backward by operating i in the front-rear direction.
With this configuration, the traveling transmission transmits the gear of the main transmission mechanism to the in-use vehicle speed band selected by the manual operation of the shift lever 3 by the shift control unit (shift command means) of the traveling shift control device. The position can be selected and adjusted to a predetermined speed.
[0020]
As shown in the input / output system diagram of FIG. 3, the shift control unit is connected to various sensors in addition to the auxiliary shift lever 3, the driving mode 4, the engine start switch 5, and receives signals on the input side of the controller 1. Further, the output side of the controller is connected to a switching solenoid group 11 for the main shift from the first speed to the fourth speed, a forward and reverse switching solenoid group 12 for switching the forward / reverse switching mechanism g, and a drive unit for other devices. To output a control command, and further communicably connected to a control monitor 21 called a multi-eye. In addition to manually selecting and operating the vehicle speed band, the sub-shift lever 3 is provided with a speed-up switch 3a, a deceleration switch 3b, and a speed-change automatic switch 3c on its grip portion, and sends operation signals for speed-up and speed-down. Also, an operation signal for switching between automatic shift and manual shift is sent. With these switches 3a to 3c, the gear can be freely operated with one lever during speed change traveling.
[0021]
As an example of the automatic shift control process by the shift control unit, as shown in the flowchart of FIG. 4, by reading various input signals (S1), the automatic shift control process is performed only when the automatic shift is applicable (S1). S2). The signal of the automatic shift can be selected and operated by the operator at any time by the automatic shift switch 3c provided on the grip portion of the auxiliary shift lever 3.
[0022]
Next, if the condition immediately after the start of the engine is satisfied, a shift process is performed, and the main shift is switched to the stored shift position (S3, S4). By switching the main shift at the time of starting the engine, the work up to that point is reflected when the work is resumed after the interruption of the work such as lunch, so that the work can be smoothly continued. If the condition for maintaining the forward gear position for one minute or more is satisfied, the stored content is changed to the corresponding gear position (S5, S6). By setting this time as the condition, it is possible to count the time while avoiding a situation where the count result is cleared when the work is interrupted and the engine is stopped, for example.
[0023]
In addition, as an initial value, approximately 1 km / h, 2 km / h, and 10 km / h correspond to the vehicle speed that many people position mainly in the rice fields, for example, the low speed operation position, the medium operation speed position, and the movement speed position of the sub-transmission. By configuring so that the main shift position is selected so that the vehicle speed becomes about h, the initial position at the time of factory shipment can be used without much discomfort.
[0024]
The maintenance time is counted (S7) by the condition check immediately after the engine is started (S3) and the condition check for maintaining the forward gear position for one minute or more (S5), even when these conditions are not met. Counting is performed for each main shift position, for each operating direction of the sub-shift, for each running direction of forward and reverse, and during reverse, counting is performed separately for turning and straight ahead depending on the presence or absence of steering wheel operation. The corresponding counting becomes possible. For example, by setting the operation direction of the sub-shift (shift down direction and up-shift direction), the sub-shift operation may be performed when the vehicle shifts from traveling on the field to the field work, or when shifting over another sub-shift position during the work. Since the purpose of changing the shift position differs depending on the time, the relationship with the immediately preceding operation can be reflected depending on the operation direction of the sub-shift. Therefore, the shift that matches the work can be performed by counting the shifts in consideration of the work flow corresponding to the operation of the sub-shift, so that the operator operates only the sub-shift with almost no adjustment of the main shift. This makes it possible to adjust to the target vehicle speed. The same applies to switching between forward and backward. In addition, by excluding the time of clutch disengagement and the time of reverse neutral from the count, the count can be limited to the actual driving results.
[0025]
In addition, if necessary, a switch for changing the running state, for example, a "running mode" for running without working and a "working mode" for running while working are provided and counted for each mode. The gear shifting process is performed so as to select the gear position of the mechanism. The above-mentioned mode selection has an adjusting action according to personal preferences such as the age and personality of the operator when the set speed at the moving speed position is felt to be too fast. Can be.
[0026]
When the change of the sub-shift position is the moving speed (vehicle speed band of road traveling), the main shift automatic shift linked with the accelerator is performed (S8, S9, S10). In this case, by performing shift control so as to sequentially shift from a low speed stage so as to correspond to an accelerator operation, a large starting torque can be used to ensure safe and smooth high-speed driving on the road without incurring running obstacles such as stalling due to high-speed gears. Enables mobile traveling. Further, if necessary, by sequentially shifting from the low gear to the stored gear ratio, road traveling at the actual speed at the time of the previous road traveling can be performed only by the operator operating the sub-shift.
[0027]
When the change of the sub-shift position is the work speed (the vehicle speed band of the low-speed to high-speed work traveling), the main shift position maximum time position at the sub-shift position before the change is stored and changed as the shift position at the time of switching (S11), and Then, the main shift is switched to the stored main shift position corresponding to the current sub-shift position (S12). In other words, in the case of a band change within the range of the speed range for work traveling, the stored contents are changed to the gear position of the longest time during counting, and the gear is shifted to that gear position in response to a shift command.
[0028]
In addition, the forward / backward change is checked (S13), including the case where the above-mentioned sub-shift position change check (S8) is not applicable, and in the case of switching from reverse to forward, the stored main shift position corresponding to the current sub-shift position. (S14) On the other hand, in the case of switching from forward to reverse, on the condition that the specified time has elapsed and there is no turning operation, the stored main shift position corresponding to the back-side auxiliary shift position. The main transmission is switched (S15 to S17). This switching at the time of back is different from the sub-shifting operation that changes the work itself, and is applied to a high-speed reverse running or the like that is performed while the work is being continued to improve work efficiency. By performing the shift reflecting the relationship, the working efficiency can be increased. In addition, in general rotary work, forward back is repeated at four corners of the field, and in this case, there is no need to switch the main transmission, but when the headland requires one step of tilling, loader work, etc. When back and forth are repeated, the vehicle may go back at high speed. By interlocking the turning operation with the back, it is possible to handle the rice field in a manner different from the corner turning of the rice field.
[0029]
As another example of the automatic shift control process, as shown in the flowchart of FIG. 5, reading of various input signals (S21), and subsequently, counting of the maintenance time (S22) are performed. In the same manner as described above, the count is performed for each main shift position, for each operation direction of the sub-shift, and for each of the forward and reverse directions, excluding the clutch disengagement and reverse neutral time. Further, only when the reading does not correspond to the automatic shift operation, the manual normal shift control is performed (S23, S24). In the case of automatic shifting, immediately after the engine is started, the gear is shifted to the stored main shifting position corresponding to the auxiliary shifting position (S25, S26).
[0030]
Next, if the continuation time at the current sub-shift position is equal to or longer than the stored main shift position continuation time, the storage position of the main shift automatic shift position for each sub-shift position is changed (S27, S28). At the time of engine stop operation, the storage is changed as the main shift automatic shift position for each sub-shift with the maximum time at each sub-shift position when the engine is turned on this time (S29, S30). The main shift is changed to the storage position according to the sub-shift position in response to the sub-shift change operation (S31, S32). In other words, the maximum time for each sub-shift position is such that the maximum time during the previous engine operation is valid at the time of starting the current engine, the storage position is updated when a shift position exceeding the previous maximum time occurs during the current engine operation, and The main shift position at the time of changing to the sub-shift position even during the operation of the engine this time is configured. With this configuration, each time the engine is restarted, it is reset and a new automatic transmission position is determined. Therefore, when the work content changes from tilling to substitute scraping, the work time in the past (when tilling) is reduced. It is possible to respond promptly without long-term effects.
[0031]
Next, a predetermined display is performed to indicate the reason for the change in response to the shift from the previous automatic shift position (S33, S34). That is, when the main shift automatic shift position for each sub shift position is changed from the previous automatic shift position to a different position, the liquid crystal display, the audio monitor, or the like is configured to notify the reason for the change. For example, a message such as "The automatic shift position has been changed from the third speed to the second speed since the working time in the second speed of the second speed has exceeded two hours" is displayed on the operation monitor. With this configuration, when the automatic shift position is changed, some people may have anxiety such as "Why is the next shift position different?" Can remove the feeling of anxiety.
[0032]
In addition, the change history of the main shift automatic shift position is displayed in chronological order along with the date and time in response to the request (S35, S36). For example, regarding the sub-shift "high", "... second speed (5h) date and time 11/11, ← third speed (3h) date and time 11/11, ← second speed (3h) date and time 11/10, ← fourth speed (6h) The date and time 11/09 is displayed. In this way, by displaying the change on the storage position for each sub-shift position on the operation monitor or by connecting and attaching a separate microcomputer checker or the like, it is possible to determine at what work position in the past, You can know if you were working. As a result, in the case of a tractor used by a plurality of operators in a group or the like, it is possible to grasp the work efficiency of each operator, and it becomes a means of grasping the difference in the work efficiency depending on the field.
[Brief description of the drawings]
FIG. 1 is a side view of an agricultural tractor. FIG. 2 is a power transmission diagram of an agricultural tractor. FIG. 3 is an input / output system diagram of a shift control unit of a traveling shift control device according to the present invention. FIG. 5 is a flowchart illustrating another example of the shift control process. FIG. 5 is a flowchart illustrating another example of the control process of the shift control unit.
1 controller (traveling speed control device for agricultural tractor)
3 Sub-shift lever 3c Shift automatic switch 4 Running mode 5 Engine start switch 11 Main shift switching solenoid group 12 Forward / reverse switching solenoid group 21 Control monitor d Main transmission mechanism e Sub-transmission mechanism H Road running (vehicle speed band)
L Low speed operation (vehicle speed band)
M High speed running during work (vehicle speed band)

Claims (6)

A main transmission mechanism (d) having a plurality of gear positions capable of selecting a transmission gear ratio for a used vehicle speed band among a plurality of vehicle speed bands (L, M, H) set in a shift range of the traveling transmission; And a shift commanding means for commanding a shift of the gear position of the main transmission mechanism (d).
The shift command means counts the maintenance time of the gear position selected during traveling of the vehicle (S7), and stores the longest gear position as an automatic shift position at the end of use of each vehicle speed band (S11). And an automatic transmission means for instructing (S12) a shift to the gear position according to the storage when the corresponding vehicle speed band is used next time. The automatic transmission means counts (S7) and stores (S11) in each of the stroke sections in which the respective maintenance time of the gear position during the traveling of the vehicle is divided into a shift-up step and a shift-down step in the vehicle speed band. The traveling speed control device for an agricultural tractor according to claim 1, wherein the speed change (S12) is performed. The travel speed control device for an agricultural tractor according to claim 1, wherein the automatic transmission means counts a maintenance time (S7) excluding a time during which the traveling of the vehicle is stopped. The automatic transmission means counts (S7), stores (S11), and shifts (S14, S14) in each direction section in which the maintenance time of the gear position when the vehicle travels is distinguished between forward traveling and reverse traveling. 2. The travel speed control device for an agricultural tractor according to claim 1, wherein S17) is performed. The traveling speed control device for an agricultural tractor according to claim 1, wherein the automatic transmission means issues a command (S10) to shift to a gear position in accordance with an accelerator operation when a vehicle speed band for traveling on a road is used. . The automatic shifting means instructs a shift to a stored gear position at the time of starting the engine, starts counting the maintenance time of the selected gear position from the time of starting the engine (S30), and sets the automatic shifting position. And storing the same for a gear position in which the maintenance time during counting exceeds the stored maintenance time (S27, S28). 2. The traveling speed control device for an agricultural tractor according to claim 1.

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