JP2000329165A - Transmission controller, for moving vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shift to a start initial time change mode and to quickly adjust the set time even if there is dispersion in connecting times of clutches according to machines by changing over the mode to a start initial time change mode by turning on a key switch and accelerating/decelerating switches. SOLUTION: A start initial time for arbitrarily changing the initial time when a large current flows for diving a piston of a hydraulic clutch by changing a pulse duty ratio of the proportional solenoid of a proportional pressure reducing valve for controlling the set-up of a forwarding/retreating changeover device connected to a controller 35 is changed over by turning on a key switch 57 and then turning on an accelerating transmission switch 16 and a decelerating transmission switch 17 provided in a transmission lever. This constitution can change the time for carrying a drive current for moving a piston in the initial stage of connecting a hydraulic clutch so that the setting time can be quickly adjusted in a shipping stage, even if there is dispersion in bore diameter of the piston, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for a moving vehicle, and is used for a tractor or the like.

[0002]

2. Description of the Related Art The applicant of the present invention has filed an electronic shift device in the past, and this electronic shift device is capable of shifting to an arbitrary position in response to an electric signal. When a synchromesh type main transmission and an auxiliary transmission, and a hydraulic clutch for forward / reverse switching are provided immediately before these transmissions, and a push button switch for a main transmission operation or a lever for an auxiliary transmission operation is operated, The hydraulic clutch for forward / reverse switching is disengaged, the shifter is moved to a target shift position, and then the hydraulic clutch is connected again to transmit power.

In this case, the pattern for increasing the pressure for connecting the hydraulic clutch is configured as shown in FIG. 6. In the initial stage of the clutch connection, a large current of 100% duty is proportionally reduced in order to quickly move the piston. In order to flow the solenoid of the valve for a short time (initial time) and reduce the shock and connect the hydraulic clutch, the current is temporarily reduced and the current is gradually increased.

[0004]

However, in the above-described conventional apparatus, the initial time is constant, and the connection timing of the hydraulic clutch varies from machine to machine. More specifically, the operation amount of the hydraulic clutch differs depending on the bore diameter, stroke amount, oil leakage flow rate, and supply flow rate of the piston. Even if the solenoid of the proportional pressure reducing valve is excited at the same duty ratio, there is a problem in machining accuracy. However, there is a disadvantage that the time from when the hydraulic clutch piston moves to when the clutch is engaged varies.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in consideration of the above-described circumstances. Therefore, the following technical measures were taken. That is, the speed change of the transmission is electrically performed in response to the operation of the speed change switch or the speed change switch, and the initial time of the initial connection of the hydraulic clutch device is changed by shifting to the start initial time change mode. In the shift control device for a mobile vehicle provided with control means for changing the starting time changeover to the starting initial time change mode,
A shift control device for a mobile vehicle, which is configured to be enabled by turning on a key switch and both shift switches for increasing and decreasing speed, is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments shown in the drawings. First, the configuration will be described. Reference numeral 1 denotes a tractor, 2 denotes a front wheel, and 3 denotes a rear wheel. An engine 4 is mounted on the front of the tractor 1, and a clutch housing 6 containing a main clutch 5 and a transmission case 8 containing a transmission are connected to the rear of the engine 4. In a transmission case 8, a synchromesh type main transmission 9 capable of four-speed shifting,
Similarly, a synchromesh type auxiliary transmission 10 capable of four-speed shifting and a hydraulic forward / reverse switching device 11 for changing the direction in which the aircraft advances are provided in series. The hydraulic clutch 13 of the forward / reverse switching device 11 includes a forward (F-side) hydraulic clutch 13a and a reverse (R-side) hydraulic clutch 13b.
The configuration is such that the 16 shift speeds as shown in the shift speed table of FIG.

The arm portion of the transmission lever 12 for operating the main transmission 9 and the auxiliary transmission 10 is inserted into a guide groove 15 a of an H-shaped transmission guide 15 beside the cockpit 14. The handle portion of the operation lever 12 is provided with button type speed change switches 16 and 17 for increasing / decreasing speed. For example, when the speed change switch 16 for increasing speed is pressed, the speed is shifted up from the 1st speed to the 4th speed, and the speed change speed When the speed change switch 17 is pressed, the speed is shifted down from the fourth speed to the first speed, and the main speed change device 9 is shifted in the range from the first speed to the fourth speed by appropriately operating the speed change switches 16 and 17 as described above.

The shift lever 12 can also switch the sub-transmission 10, but in this embodiment, when switching the sub-transmission 10, the clutch pedal 7 is depressed to disengage the main clutch 5 before shifting. It is composed. That is, after the main clutch 5 is disengaged, if the speed change lever 12 is moved back and forth or right and left along the speed change guide groove 15a, a high speed (L speed), a low speed (L speed), a medium speed (M speed), and an ultra low speed ( LL speed). Since the movement of the shift lever 12 is used for timing adjustment (step-up control) for connecting the clutch of the hydraulic clutch 13 and for monitor display, the position detection sensor 2 that detects the movement is provided on the lateral side of the transmission case 8.
0 and 21 are embedded.

FIG. 3 shows the detailed structure. 2
The shifter pins 23 and 24 are pivotally supported at two upper and lower stages in the transmission case 8 along the front-rear direction.
Shifters 25 and 26 for switching the transmission gears are fitted and mounted, respectively. 27 and 28 are shifter pins 23 and 2
The upper surface of each of the bosses 27 and 28 is cut out in a U-shape to form recesses 27a and 28a, and the spherical portion 12a at the lower end of the transmission lever 12 is formed with the recesses 27a and 28a. 28a. Therefore, the spherical portion 12 of the transmission lever 12 is recessed 27
a (or 28a), the shifter 25 (or 26) of the auxiliary transmission 10 is moved in the front-rear direction, and the speed is changed.

At this time, when the shifters 25, 26 move in the front-rear direction, the cam 2 integrated with the shifters 25, 26 is moved.
Reference numerals 5a and 26a depress the pins 20a and 21a of the position detection sensors 20 and 21 embedded in the wall of the transmission case 8 to detect a shift position. Specifically, the position detection sensor 20 detects each position of H speed-neutral (N) -L speed, and the position detection sensor 21 detects M speed-neutral (N) -L
Each position of the L speed is detected.

As described above, in this embodiment, only the main speed change operation is performed with no clutch operation. However, when the speed change switches 16 and 17 of the speed change lever 12 are pressed and the main speed change device 9 is switched, the speed change is performed. First, the hydraulic clutch 13 of the forward / reverse switching device 11 is switched to the OFF state, and then the shifters 31 and 3 of the main transmission 9 are shifted.
When the piston rods 33 and 34 for operating the second gear 2 are forcibly moved in the longitudinal direction of the shaft by hydraulic pressure, and it is electrically detected that the shifters 31 and 32 have reached a predetermined shift position, the forward / reverse switching device 11 is again turned on. The hydraulic clutch 13 is connected. These switchings are all electrically controlled by a controller 35 described later.

FIG. 8 is a block diagram for explaining the relationship between the controller 35 constituting the control system, input means including sensors and switches, and output means such as a solenoid. The controller 35 includes the shifter 3 of the main transmission 9.
Solenoids 37, 38, 39, and 40 for switching the solenoid valves 18 and 19 for operating the solenoid valves 1 and 32, and solenoids 41 and 42 of the solenoid valve 22 for switching the forward / reverse switching device 11
And a proportional solenoid 47 that controls the proportional pressure reducing valve 45 for boost control of the forward / reverse switching device 11 is connected. The proportional solenoid 47 controls the timing for connecting the hydraulic clutch 13 by changing the duty ratio of the pulse. In the figure, reference numeral 48 denotes a monitor lamp, and 49 denotes a position sensor for detecting a position of a shifter for operating the main transmission 9.

The controller 35 includes a rotation sensor 52 for detecting the number of rotations of the engine 4, a wheel rotation sensor 53 for detecting the number of rotations of the rear wheel 3, and a forward / reverse switching lever 3.
The F-R changeover switch 54, a buzzer 55 as an alarm, a check switch 56, a key switch 57, and the like, which are pressed when switching to an inspection mode for checking the operation state of each sensor, are connected.

Further, the controller 35 stores a program for automatically changing the speed of the main transmission 9 and a program for appropriately changing the time for flowing a large current for driving the piston at the initial stage of the connection of the hydraulic clutch 13, that is, the initial time. Means (a nonvolatile memory such as an EEPROM). Hereinafter, this program will be described.

As shown in the flow chart of FIG. 9, after the key switch 57 is turned on (step S2), the speed change switch 16 provided on the speed change lever 12 is switched to the start initial time write mode. When both the deceleration shift switches 17 are turned ON (step S3), the process shifts to the starting initial time change processing mode (step S4).

After shifting to the starting initial time change mode as shown in FIG.
When both 6 and 17 are turned off (step # 2), the buzzer 55 sounds only once at that moment (step # 4). Thereafter, in this initial time change mode, when the speed change switch 16 on the speed increasing side is pressed, the initial time stored as the reference value (in this embodiment, 180 as the reference value).
The time of 20 msec is added to the time of msec (step # 5, step # 7).

On the other hand, when the initial time is to be reduced, the deceleration-side shift switch 17 is pressed only once in step # 5 of this flowchart (step # 5).
6). Then, 20 m for the reference value of 180 msec.
The initial time of 160 msec reduced by sec is newly set, and the reference value is rewritten. When the process is completed once on both the speed increasing side and the decelerating side, the buzzer 55 sounds twice (step # 8). Thereafter, by repeating this process several times, the initial time is rewritten in units of 20 msec. is there.

As described above, in this embodiment, the proportional solenoid 47 for controlling the proportional pressure reducing valve 45 of the hydraulic clutch 13 is used.
On the other hand, since the drive current control time for moving the piston in the initial stage of connection can be appropriately rewritten, even if the bore diameter of the piston of the hydraulic clutch 13 varies, the tractor can be easily shipped. In addition, since it can be adjusted quickly, the feeling of clutch connection does not differ for each machine, and stable performance can be ensured. Further, since the time until the clutch is engaged can be easily changed according to the work purpose, there is a feature that the specification can be quickly responded to.

Next, an improved invention of the related apparatus will be described with reference to FIGS. The graph of FIG. 11 corresponds to FIG. 6, and in FIG. 11, the pattern for connecting the hydraulic clutch 13 is divided into three patterns. The pattern A is a pattern for increasing the pressure when the forward / reverse switching lever 30 is switched, the pattern B is a pattern for increasing the speed when increasing the speed, and the pattern C is a pattern for increasing the pressure when decreasing the speed.

When the vehicle starts moving (when the forward / reverse switching lever 30 is switched from the neutral position to the forward side F or the reverse side R) or when increasing the speed, the vehicle speed difference is large when the hydraulic clutch 13 is turned on and off. If not connected, there is a problem that the shock at the time of starting and the shock at the time of shifting are increased. Therefore, the boosting time is set longer at the time of starting and at the time of increasing the speed. Conversely, if the connection is loose on the deceleration side, the transmission of the deceleration torque is slow, and the deceleration time is prolonged. Therefore, in this embodiment,
Contrary to the above case, the boosting time is shortened.

In this embodiment, the initial time at the time of start (when switching between forward and backward) is about 100 msec, and the initial time at the time of acceleration and deceleration is 40 to 50 msec.
About.

[0022]

As described above, the present invention is configured such that the speed change of the transmission is performed electrically in response to the operation of the speed-up shift switch or the speed-reduction shift switch, and the shift to the starting initial time changing mode is performed. In the shift control device for a moving vehicle provided with control means for changing an initial time at the initial stage of connection of the hydraulic clutch device, the switching to the start initial time change mode is performed by turning on a key switch and both speed change switches for increasing / decelerating. Therefore, even if the time for connecting the clutch varies from machine to machine, any of the key switches and the increase / decrease By turning on both speed change switches, it is possible to quickly shift to the start initial time change mode and easily adjust to the set time It is kill things. Thus, the operation feeling at the time of starting or changing the shift can always be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a tractor.

FIG. 2 is a plan view of the tractor.

FIG. 3 is a diagram illustrating a relationship between a position detection sensor and a shifter of the auxiliary transmission.

FIG. 4 is a power transmission diagram.

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is a diagram illustrating a boosting pattern.

FIG. 7 is a diagram illustrating the number of gear positions.

FIG. 8 is a control block diagram.

FIG. 9 is a control flowchart.

FIG. 10 is a control flowchart.

FIG. 11 is a diagram illustrating a boosting pattern corresponding to FIG. 6;

FIG. 12 is a control flowchart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 2 Front wheel 3 Rear wheel 4 Engine 9 Main transmission 10 Sub transmission 11 Forward / reverse switching device 12 Shift lever 20 Sub transmission position detection sensor 21 Sub transmission position detection sensor

Claims (1)

[Claims] A transmission is configured to be electrically shifted in response to operation of a speed-up shift switch or a speed-reduction shift switch, and a shift to a starting initial time change mode is performed to start connection of a hydraulic clutch device. In a shift control device for a mobile vehicle provided with control means for changing the initial time of the vehicle, it is possible to switch over to the start initial time change mode by turning on a key switch and both speed change switches for increasing / decreasing. A shift control device for a mobile vehicle having the above structure.