KR20040074582A - Shift Control Device for Tractor - Google Patents

Abstract

PURPOSE: A travel transmission control device of an agricultural tractor is provided to improve working efficiency and convenience by shifting gears according to the surrounding condition without frequently regulating speed. CONSTITUTION: A travel transmission control device of an agricultural tractor is composed of a main shifting mechanism having the gear position of plural ranges for selecting the motor gear ratio according to the vehicle speed range predetermined within the shifting range by a motor, and a shifting command unit commanding shifting of gear position of the main shifting mechanism. The shifting command unit has an automatic shifting unit for counting the remaining time of the selected gear position during traveling(S7), memorizing the maximum gear position in finishing the vehicle speed range(S11) and commanding shifting of gear position related to the memory in using the vehicle speed range again(S12).

Description

Shift Control Device for Agricultural Tractor {Shift Control Device for Tractor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling shift control apparatus for an agricultural tractor, and more particularly, to an agricultural tractor capable of efficiently carrying out work by enabling an appropriate automatic shift in work running without cumbersome speed adjustment operation. It relates to a traveling shift control device.

In the shift control apparatus for agricultural tractors, an example of shift control to automatically shift the vehicle speed range selected by the operation lever is known as in Japanese Patent Laid-Open No. 9-166211.

Specifically, the shift control device is a sub-shift mechanism capable of manually switching three speeds of work low speed driving L, work medium speed driving M, and road running H by the sub shift lever, and the respective shifting mechanisms are electronically provided. It is comprised by the automatic main transmission mechanism which can change gear ratio of multiple stage by an actuator by control. By operating the main shift selector switch for increasing or decreasing the gear ratio, it is possible to select from a multi-gear gear position of a wide range of electric gear ratios from work to road running. In addition, by providing an automatic shift function that shifts in response to the engine speed on the basis of a constant condition, automatic shifting becomes possible in correspondence with the accelerator operation, thereby avoiding cumbersome gear position shifting operations and improving operability. .

However, in the shift control apparatus, the operator needs to operate the changeover switch once by the automatic main transmission mechanism at a work speed position suitable for the operator according to the work content and the operator's preference, and the automatic shift function also controls the accelerator adjustment. As needed, the hassle of speed regulation was always inevitable.

An object of the present invention is to provide a traveling shift control apparatus for an agricultural tractor that enables shifting of a gear position corresponding to a situation without requiring cumbersome speed adjustment.

1 is a side view of an agricultural tractor (Tractor)

2 is a power transmission diagram of the agricultural tractor

3 is an input / output system diagram of a shift control unit of a traveling shift control apparatus according to the present invention.

4 is a flowchart showing an example of the automatic shift control process of the shift control unit;

5 is a flowchart showing another example of the control process of the shift control unit.

[Description of the code]

1 ... Controller (driving control device of agricultural tractor)

3 ... secondary shift lever

3c ... shift automatic switch

4 ... riding mode

5 ... engine start switch

11 ... main shifting solenoid group

12 ... forward and reverse switching solenoid group

21 ... control monitor

d ... main transmission

e ... secondary transmission mechanism

H ... Road Trip (Vehicle Speed Band)

L ... Work low speed (vehicle speed band)

M ... work medium speed (vehicle speed band)

SUMMARY OF THE INVENTION In order to solve the above problems, the invention according to claim 1 provides a gear position of a plurality of stages in which an electric gear ratio can be selected with respect to a vehicle speed band in use among a plurality of vehicle speed bands set in a shift range by a traveling motor. In the traveling transmission control apparatus for an agricultural tractor provided with the main transmission mechanism which has, and the shift command means which instructs the shift of the gear position of this main transmission mechanism, the said shift command means counts the holding time of the gear position selected at the time of gas running, respectively. An automatic transmission means for storing the longest gear position therein as the automatic shift position at the end of use of each vehicle speed band, and instructing the shift of the gear position with respect to the memory when the corresponding vehicle speed band is next used. It characterized by having a.

The shift command means stores, as the automatic shift position, the longest time gear position for each vehicle speed band by counting by the automatic transmission means, and when the vehicle speed band is changed, the previous longest of the corresponding vehicle speed band. Since the gear position memorized for use is selected and the speed is adjusted, it corresponds to the vehicle speed band, so that the longest used vehicle speed can be obtained.

The invention according to claim 2 is characterized in that the automatic transmission means includes counting, storing, and shifting in the respective stroke sections in which each holding time of the gear position during the vehicle driving is divided into a shift-up stroke and a shift-down stroke of the vehicle speed band. Characterized in that. By the automatic transmission means, the gear position is stored and the shift command is divided into a shift up stroke and a shift down stroke of the vehicle speed band, so that a vehicle speed suitable for the work can be obtained in correspondence with the shift direction of the vehicle speed band.

The invention according to claim 3 is characterized in that the automatic transmission means counts the holding time except for the time for stopping the gas running. The automatic shift means selects the gear position corresponding to the actual traveling operation since the past time is counted only during the traveling operation.

The invention according to claim 4 is characterized in that the automatic shifting means counts, stores, and shifts each of the holding time of each of the gear positions at the time of gas driving in each of the direction divisions divided into forward travel and backward travel. . By the automatic shifting means, the gear position is commanded to be divided into forward travel and backward travel so as to be adjusted to the vehicle speed corresponding to forward and backward travel.

The invention according to claim 5 is characterized in that the automatic transmission means instructs the shift of the gear position according to the accelerator operation when the vehicle speed band of the road running is used. By the automatic transmission means, it becomes possible to respond to the normal road running from the shift command according to the accelerator operation during the road running.

According to a sixth aspect of the present invention, the automatic transmission means instructs the gear shift to the completed gear position at the time of engine start, and starts counting the holding time of the selected gear position from the engine start time. The storage of the position includes a corresponding holding time, and the memory is changed in the same manner with respect to the gear position whose holding time in the count exceeds the holding time of memory completion. The automatic transmission means starts counting by starting the engine and stores the new gear position as the automatic shift position based on the counting result. When the engine is restarted, the memory is reset and the memory is changed. During operation, the memory of the automatic shift position changes according to the holding time.

EXAMPLE

Embodiments specifically configured based on the technical idea will be described below with reference to the drawings.

The traveling shift control apparatus according to the present invention is applied to shift control of a traveling motor of an agricultural tractor. The agricultural tractor is provided with front wheels a and rear wheels b in front and rear of the body, respectively, as shown in the side view of FIG. 1, and transmits the rotational power of the engine c mounted in the bonnet to the transmission in the transmission case, and suitably in the transmission. It is configured to transmit the reduced power to the front wheel a and the rear wheel b. The transmission consists of a main transmission mechanism d and a sub transmission mechanism e as will be described later. In some cases, as shown in the power transmission diagram of FIG. 2, a hydraulic high and low switching mechanism immediately before these transmission mechanisms. You may install f. The sub transmission mechanism e operates by shifting the shift lever (sub transmission lever 3) to be described later in the front-rear direction, and the peripheral gear mechanism d is the speed increase switch 3a and the deceleration switch 3b provided at the handle portion of the shift lever 3. ) To change it.

As shown in Fig. 2, the agricultural tractor is provided with a forward and backward switching mechanism g for changing the traveling direction of the body back and forth in the driving motor system, and a reverse lever (forward and reverse switching lever) i below the steering wheel h. The gas can be advanced or reversed by operating in the front-rear direction.

With such a configuration, the traveling electric motor is configured to adjust the gear position of the main transmission mechanism to the vehicle speed band in use selected by manual operation by the shift lever 3 by the shift control unit (shift command means) of the travel shift control apparatus. You can select and adjust the speed.

As shown in the input / output system diagram of FIG. 3, the shift control unit is connected to various input sensors other than the sub-shift lever 3, the driving mode 4, and the engine start switch 5 to the input side of the controller 1. Switching solenoid group 11 of the main transmission from 1st speed to 4th speed, the forward and backward switching solenoid group 12 which switches the said forward-backward switching mechanism g on a signal output, and an output side of a controller, and other apparatuses The control command is output by connecting to the drive unit of the control unit, and further connected to the control monitor 21 called a multiplier. In addition to manually selecting and operating the vehicle speed band, the subsidiary shift lever 3 includes a speed increase switch 3a, a deceleration switch 3b, and a speed change automatic switch 3c. It sends an operation signal of, and also sends an operation signal for changing the automatic shift and the manual shift. By these switches 3a to 3c, one lever can freely operate in shifting driving.

As shown in the flowchart of Fig. 4, the automatic shift control processing by the shift control unit performs automatic shift control processing only when it corresponds to shift automatic by reading various input signals (S1) (S2). ). The shift automatic signal can be operated by the operator at any time by the shift automatic switch 3c provided on the handle portion of the auxiliary shift lever 3.

Subsequently, if the condition immediately after the engine starts, the shift processing is performed, and the main shift is switched to the stored shift positions (S3 and S4). By switching the main shift at the time of starting the engine, the work up to it is reflected in the resumption after stopping work such as lunch, so that the work can be continued smoothly. If the forward gear position is suitable for holding conditions for 1 minute or longer, the stored contents are changed to the corresponding gear position (S5, S6). In this case, time can be avoided by avoiding the situation where the count result is cleared.

In addition, as an initial value, about 1 km / h and 2 km / h correspond to a vehicle speed at which a large number of people mainly use a paddy field, for example, a work low speed position, a work intermediate speed position, and a moving speed position of a sub-shift. By selecting the main shift position so that the vehicle speed is about 10 km / h, even in the initial position at the factory, it can be used without discomfort.

The condition check S3 immediately after the engine start and the condition check S5 for holding the forward gear position for one minute or more include counting the retention time S7 including cases where these conditions do not correspond. The counts are determined by counting each of the main shift positions, by the direction of the sub-shift, by the driving directions of the forward and the retreat, and by reversing the counting between the turning and the straight with or without the steering wheel operation. The count according to the form becomes possible. For example, by changing the sub-shifting operation direction (shift-down direction and shift-up direction), the sub-shift position is changed, for example, when shifting from road running to field work, or when shifting over another sub-shift position during work. Since the purpose differs depending on the time, the relationship with the immediately preceding work can be reflected by the operation direction of the sub transmission. Therefore, the shift that matched the work is possible by the shift count that adds the operation of the sub shift and the corresponding work flow, so that the operator needs only the sub shift without requiring almost any adjustment of the main shift. By operating, it becomes possible to adjust to a desired vehicle speed. The same applies to the transition between forward and backward. In addition, by eliminating the time between the clutch OFF and the reverse neutral from the count, the count limited to the driving performance becomes possible.

In addition, if necessary, a switch for switching the driving state is provided, for example, a "traveling mode" that travels without work and a "working mode" that travels while working, and is counted for each mode. And shifting to select the gear position of the corresponding main transmission mechanism. The mode selection can be reflected in the automatic shift processing, including the adjustment operation to suit an individual's taste, such as an operator's age, individuality, etc., when the setting speed at the movement speed position is felt too fast.

When the subshift position change is shifting (vehicle speed band for road-driving), the main shift automatic shift of the accelerator linkage is performed (S8, S9, S10). In this case, the shift control is performed so as to sequentially shift from the low speed stage so as to correspond to the operation of the accelerator, thereby safe and smooth high speed on the road due to a large starting torque without causing an obstacle caused by the high speed gear. Enable mobile travel. In addition, if the gear ratio is stored so as to shift gears in order from the low speed stage in order, the operator can operate the sub-shift only, and the road running by the speed of performance at the time of the previous road running becomes possible.

If the subshift position change is a work speed (vehicle speed band for low to high speed driving), the memory is changed as a shift position when the main shift position maximum time position is changed from the subshift position before the change (S11). In addition, the peripheral speed is changed to the memory main shift position according to the current sub shift position (S12). That is, in the case of a band change in the range of the speed range for work travel, the memory content is changed to the gear position of the longest time in the count, and the gear position is shifted to the gear position by the shift command.

In addition, including the case where it does not correspond in the said check of the subshift position change (S8), the change of forward and backward is checked (S13), and, in the case of switching from reverse to forward, the memory week according to this subshift position. The main shift position is shifted to the shift position (S14), and on the other hand, in the case of switching from forward to backward, the storage main shift position according to the secondary shift position at the time of reverse, provided that the prescribed time has elapsed and there is no turning operation. To change the main shift (S15-S17). The switching at the time of reverse movement is different from the sub-shift operation for changing the work itself, and is applied to a high speed reverse driving or the like that is performed during the operation for the purpose of the work efficiency, and thus, the shift is reflected to the relationship with the forward and backward operation. By this, work efficiency can be raised. In general, in many rotary operations, the forward reverse is repeated at four corners of the field, and in this case, it is not necessary to change the main shift in particular, but in the case of tillage of the first step at the head of the pillow, In case of repeating forward and backward by the loader operation, there is a case of fast reverse. By linking the turning operation with respect to the reverse, the handling which distinguishes the corner turning of the rice field and others is attained.

As another example of the automatic shift control process, as shown in the flow chart of FIG. 5, reading of various input signals (S21) and subsequent counting of the holding time (S22) are performed. As described above, the count is counted for each of the main shift positions, for each operation direction of the sub shift, for each direction division of the forward and the reverse, except for the clutch OFF and reverse neutral times. In addition, manual normal shift control is performed only when it does not correspond to shift automatic by reading (S23, S24). In the case of the shift automatic, as soon as the engine is started, it shifts to the storage main shift position corresponding to the sub shift position (S25, S26).

Subsequently, if the duration of time at the current sub-shift position is equal to or greater than the storage main shift position duration time, the storage positions of the main shift automatic shift position for each sub-shift position are changed (S27, S28). At the engine stop operation, the memory is changed as the main shift automatic shift position for each sub shift at the maximum time at each sub shift position of the engine ON this time (S29, S30). Corresponding to the sub shift change operation, the main shift is changed to the storage position in accordance with the sub shift position (S31, S32). That is, the maximum time for each sub-shift position is valid when the maximum time in the previous engine operation is effective at the time of starting the engine at this time, and a shift position exceeding the previous maximum time during the current engine operation occurs. Is updated and the main shift position at the time of changing to the sub shift position also during engine operation is configured. By this configuration, it is reset every time the engine is restarted and a new automatic transmission position is decided, and when work contents change from tillage to scraping, it influences the past (till time) working time for a long time We do not do and can cope quickly.

Subsequently, in response to the shift from the previous automatic shift position, a predetermined display is made to indicate the reason for the change (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 another position, the liquid crystal display, the voice monitor, or the like is configured to notify the reason for the change. For example, it displays on the operation monitor as "I changed the automatic transmission position from 3 speeds to 2 speeds because the working time in the main speed 2 speed exceeded 2 hours." With this arrangement, when the automatic shift position is changed, there may be anxiety depending on the person, such as "Why is the shift position different now?", And such anxiety of the operator can be removed.

Further, as required, the change history of the main shift automatic shift position is displayed in time series with the date and time (S35, S36). For example, with respect to the sub-shift "high", the second speed (5h) date and time 11/11, the third speed (3h) date and time 11/11, the second speed (3h) date and time 11/10, ← 4 speeds (6h) date and time 11/09 ”are displayed. In this way, the operation is performed at a certain work position in the past by displaying on the operation monitor so as to confirm the change of the storage position for each sub shift position, or by connecting and displaying an attached micom checker or the like. We can know whether there was. 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 for each operator and also to grasp the difference in work efficiency by the field.

The traveling shift control apparatus of the agricultural tractor of this invention has the following effects.

The traveling speed change control device for the agricultural tractor of the above-described configuration is adapted to adjust the speed according to the previous longest use record of the corresponding vehicle speed range when the vehicle speed range is changed by the automatic transmission means. Corresponding to the vehicle speed band, the vehicle speed that has been used for the longest time can be obtained, so that the operator can be freed from the hassle of speed regulation by repeating the shift of the main transmission gear position that was necessary for each change of the vehicle speed band. You can work on it.

In the case where the automatic transmission means is to adjust the speed for each shift direction of the vehicle speed band, various operations in each vehicle speed band correspond to the shift direction, so that the fine speed control corresponding to the work type can be efficiently performed. You can work on it.

In the case where the automatic transmission means is to be counted only during the driving operation, the gear position corresponding to the actual driving operation is selected. Therefore, the actual shifting operation is performed except for the clutch stop and the stop state of the aircraft such as reverse neutral. The speed control based on the traveling work enables the work to proceed efficiently.

In the case where the gear shift command is made for the automatic transmission means by distinguishing between the forward driving and the backward driving, the vehicle speed corresponds to the driving direction in each vehicle speed band, and according to the extremely fine speed control corresponding to the work type. We can work forward efficiently.

When the shifting process according to the accelerator operation is performed on the automatic shifting means, a gear position suitable for normal road driving is selected, so that the road shifting operation is not affected by running in the field work. Therefore, proper driving speed can be secured.

In the case where the automatic transmission means resets the engine every time the engine is restarted to change the memory of the automatic transmission position and changes the memory according to the holding time of the gear position during the current work, the work content is cultivated. ) When you change from scratches, you can respond quickly without having to influence the working time of the past (at the time of tillage work) for a long time.

Claims (6)

A main transmission mechanism d having a gear stage of a plurality of stages in which an electric gear ratio can be selected with respect to a vehicle speed band in use among a plurality of vehicle speed bands (車速 帶 域: L, M, and H) set in the shift range by the driving motor; In the traveling shift control apparatus of the agricultural tractor provided with the shift command means which instructs the shift of the gear position of the main transmission mechanism d, In the shift command means, the holding time of the gear position selected at the time of traveling the vehicle is counted (S7), respectively, and the longest gear position therein is stored as the automatic shift position at the end of use of each vehicle speed band (S11), And an automatic transmission means for commanding (S12) a shift to a gear position relating to the storage when a corresponding vehicle speed band is next used. The method of claim 1, The automatic transmission means has counts (S7), respectively, in the respective stroke segments in which each holding time of the gear position at the time of driving the vehicle is divided into a shift up stroke and a shift down stroke of the vehicle speed band. A traveling shift control apparatus for an agricultural tractor, characterized by storing (S11) and shifting (S12). The method of claim 1, The automatic transmission means is a traveling shift control apparatus for an agricultural tractor, characterized in that the holding time is counted (S7) except for the time at which gas traveling is stopped. The method of claim 1, The automatic transmission means includes counts S7, memories S11, and shifts S14, S17 in each direction division in which the holding time of the gear position at the time of gas driving is divided into a forward run and a backward run. Travel shift control device for an agricultural tractor, characterized in that. The method of claim 1, The automatic transmission means is a shift control apparatus for an agricultural tractor, characterized in that the shift to the gear position in accordance with the accelerator operation (S10) when the vehicle speed band of the road running is used. The method of claim 1, The automatic transmission means instructs the shift of the stored gear position at the start of the engine and starts counting the holding time of the selected gear position from the start of the engine (S30). And a storage position in which the holding time in the count exceeds the holding time of the memory completion, and changes the memory (S27, S28).