JPH02176267A - Speed change control device for tractor or the like - Google Patents

Abstract

PURPOSE:To shorten the speed rechange processing time by detecting with a speed change release sensor during running transmission a speed change gear for its meshing release, disconnecting a clutch and operating the speed change gear by an automatic speed change control device. CONSTITUTION:Speed change release is detected during running transmission by stroke sensors 18, 19. A pressure control valve 21 is output once disconnecting a clutch 3, and speed change control valves 13, 14 are output pressing a speed change clutch into a side of a speed change gear remeshed and connecting the clutch 3. These controls are performed by a command of a CPU in an automatic speed change control device 4. In this way, the speed rechange processing time can be shortened by enabling the necessity to be eliminated for operating and confirming the speed change gear to its neutral position.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a speed change control device for a tractor or the like.

Problems to be Solved by the Prior Art and the Invention While a tractor or the like is running, a transmission gear may become disengaged and the transmission drive may no longer occur. If such a shift gear disengagement is detected and a normal shift operation is performed, the shift processing time will be long and it will be troublesome.

Means for Solving the Problems According to the present invention, a sensor (1) detects disengagement of a transmission gear (2) during a traveling transmission.

The configuration of a speed change control device for a tractor or the like is provided with an automatic speed change control device (4) that operates the speed change gear (2) by disengaging a clutch (3).

Operation and effect of the invention The gear shift is performed by abandoning the clutch (3) and shifting the gear (2).
) to the neutral position, and then manually actuate the clutch (3). When the shift gear sensor (1) detects disengagement during transmission of the shift gear (2), the automatic shift control device (4) automatically disengages the clutch (3) to shift the disengaged shift gear (2). ) to quickly maintain an accurate meshing transmission state of the transmission gear (2).

For this reason, in order to immediately return the transmission gear (2) to the transmission position from the state in which it has become disengaged or has started to disengage, the transmission gear (2) must be operated to the neutral position, and then Steps such as checking the neutral position are no longer necessary, and the re-shift processing time can be shortened.

Embodiment When rotating, the tractor body is equipped with an engine (5) at the front, has a front axle steered by a steering wheel, and rear wheels (6), and uses the engine (5) to transmit power. It has a four-wheel drive configuration. These transmission configurations transmit power from the engine (5) to the rear wheels (6) through the clutch (3), the main transmission (7), the auxiliary transmission (8), etc., and the engine (5). ) to PTO clutch (9
) to the power take-off shaft OD at the rear of the vehicle body. 0δ is a clutch pedal that operates the clutch (3).

The main transmission (7) and the sub-transmission (8) each have an appropriate number of hydraulically operated transmission gears, and each transmission gear has an electromagnetic transmission control valve +1304. This speed change control valve +131
041 to operate the transmission gear, and a pressure control valve surface that controls the pressure of the hydraulic circuit 011 for the transmission operation each time each of these transmission control valves 03Q4 is operated. Cylinder (1
909 includes a stroke sensor (
IEI09 is provided to constitute a speed change sensor (1). 03 is a speed change clutch, (to) is a speed change shifter, (to) is a counter gear, Oe is an input shaft, and (capital) is an output shaft.

The obstacle sensor consists of an ultrasonic sensor and is installed on the front and rear sides of the vehicle body. When moving forward, the obstacle sensor Q1 on the front side detects an obstacle on the field in the front position, and when moving backward, it detects an obstacle on the field. The configuration is such that the obstacle sensor Ol on the side detects an obstacle at the rear position.

When the clutch (3) is released from the clutch pedal strike and the hydraulic pressure of the clutch cylinder 12G is released, the clutch disc is pushed back by the elastic force of the spring and is brought into contact with the clutch, and becomes the engaged position of the clutch connection state. , press the clutch pedal (1) or clutch cylinder +2 [
) through the hydraulic control valve 2]) to open the clutch disc spacing. In the case of the automatic clutch (3), the clutch cylinder (a) of the hydraulic circuit is operated on and off instead of by hitting the clutch pedal, and the pressure control valve Q1) that controls this hydraulic pressure and the expansion and contraction of the clutch cylinder 121 A stroke sensor (2?J) is provided to detect the amount of rotation. C!4 is an engine sensor that detects the engine rotation speed, and C!4 is the rotation at the input shaft of the main transmission (7) via the clutch (3). This is an input shaft sensor that detects numbers.

The power transmission status, slip, etc. of the clutch (3) are detected based on the difference between these engine sensors (to) and the input shaft sensor 24.

The controller (5) is a microcomputer (CPU
) to control the automatic transmission control device (4) and the check device (support), etc., and is equipped with an operation section (a) such as an operation switch, a display section etc. to display each operating section, etc. ing. (
Reference numeral 21 denotes a clutch operation switch for automatically operating the clutch (3), and when automatically shifting gears, this clutch operation switch (to) is set to ONL.

The running speed of the vehicle is changed by manual shifting or automatic shifting. During manual shifting, the clutch (3) is operated by operating the gear shift lever with the clutch lever α; automatic shifting is carried out by operating the clutch lever α. By selecting and pressing the speed change switch (a), the main transmission (7) or the auxiliary transmission (8) is decelerated or accelerated. In this operation, when the speed change switch is selected and pressed, the clutch cylinder cover is operated and the clutch (3) is disengaged. When the disengaged position of the clutch (3) is detected by the stroke sensor Q3, the shift control valve f+31 f! of the selected shift position of the main transmission (7) or the auxiliary transmission (8) is detected. 41 and the pressure control valve (■) are operated, and the speed change cylinder as as
is activated, and the transmission gear (2) is operated. When the operation of this transmission gear (2) is detected by the stroke sensor (OQ), the clutch cylinder (A) is operated under the hydraulic pressure controlled by the pressure control valve (2+), and the clutch (A) is activated by the return spring. 3) is engaged. When the engagement of this clutch (3) is detected by the stroke sensor, the current shift position is displayed on the display section (5).

The automatic transmission control device (4) is a microcomputer (C
According to the command of the shift cylinder fl'j (IQ
The speed change clutch 03 is once engaged from the neutral position to the speed change gear (2) at the speed change transmission position by the shifter (b).

When it moves in the axial direction and becomes disengaged, the speed change cylinder (151 (1119) along with the shifter (b) etc. moves to the neutral position side of this speed change clutch (13), or moves and completely disengages, but Stroke sensor f + 8 + 19 which is sensor (1) is responsible for the return movement at this time.
1 is detected, the pressure control valve 12I) is output, the clutch (3) is disconnected, and the detected speed change clutch (to) is
The transmission control valve +1:I 04) which operates the gear shift control valve +1:I 04) is output, and the transmission clutch G3 which is about to be disengaged is pushed to the transmission gear (2) side of the transmission position and re-engaged. enter.

If this operation control is shown in a flowchart, the process will be as shown in Figure 4.0 In normal automatic shift control, the gears are shifted as shown in steps ■ to ■. When a loose mesh is detected.

The steps ■, ■, ■, [stock], ■ are processed.

For this reason, the speed change clutch of the speed change gear (2) that is normally used (
33 to the neutral position (31(4)
Processed without going through.

In addition, in rotation, the transmission gear (2) is transmitted by the engagement of the transmission clutch loco, but the transmission gear (2) is moved with the shifter (to), etc. to engage and disengage the counter gear (to). It is also possible to adopt a speed change mode in which the speed is changed.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a block block circuit diagram, Fig. 3 is a partial transmission mechanism diagram, and Fig. 4 is a partial flowchart. show. In the figure, the symbol (1) is the sensor for shifting, and the symbol (2) is the gear. (3) indicates a clutch, and (4) indicates an automatic transmission control device.

Claims (1)

[Claims] During driving, the gear shift sensor (1) detects the shift gear (2).
A speed change control device for a tractor or the like, which is equipped with an automatic speed change control device (4) that disengages a clutch (3) and operates a speed change gear (2) by detecting disengagement of the gear.