KR0140745B1 - Electronic shift device - Google Patents

Abstract

[purpose]

It is an object of the present invention to provide an electronic shift device that can be operated easily and quickly.

[Configuration]

In a vehicle that transmits rotational power of an engine to a drive wheel via a plurality of transmissions, an increase / decrease that can switch a transmission separate from the transmission to a knob of a transmission lever capable of switching a predetermined transmission. It comprises a electronic shift apparatus characterized by the provision of a switch for speed.

Description

Electronic shift device

1 is an overall side view of a tractor.

2 is a plan view of the tractor.

3 is a view for explaining the relationship between the position detection sensor and the shifter of the sub transmission.

4 is a view for explaining the relationship between the shifter and the shift lever of the sub transmission.

5 is a power transmission diagram.

6 is a hydraulic circuit diagram of the forward and backward switching device and the peripheral gear device.

7 is a view for explaining a pattern of the boost control.

8 is a table for explaining the gear shift stage.

9 is a control block diagram.

10 is a control flowchart.

11 is a flowchart for explaining the contents of the shift change processing.

12 is a flowchart for explaining the contents of the peripheral speed change process.

13 is a flowchart for explaining the contents of the subshift change processing.

Explanation of symbols on the main parts of the drawings

1 ... tractor, 2 ... front wheel,

3 rear wheels, 4 engines,

9 ... peripheral gear, 10 ... sub transmission,

11 ... reverse changeover, 12 ... shift lever,

20 ... Sub-speed position detection sensor, 21 ... Sub-speed position detection sensor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic shift device and is particularly used for a vehicle provided with a plurality of transmission devices such as a tractor.

Vehicles such as tractors are equipped with a plurality of transmissions to cope with various tasks, for example, consisting of four gears of the peripheral gear and four gears of the sub transmission to enable the shifting of 16 forward and 16 reverse. have. These transmissions are known to be composed of a so-called power shift device, a synchro mesh gear, or a combination of these forms, and are switched by mechanical transmission means or hydraulic transmission means.

However, since a vehicle having a plurality of conventional transmissions is provided with shifting gears individually for these transmissions, when the vehicle body is shifted while turning the vehicle body on a field bank or the like, the main gear lever and the sub-shift lever are quickly changed. It was necessary to switch. For this reason, when a person unfamiliar with the job drives this vehicle, there is a drawback that the shift operation may be delayed or misoperated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an electronic shift device which can be operated easily and at the same time quickly.

That is, in a vehicle that transmits the rotational power of the engine to the drive wheels via a plurality of transmissions, an increase / decrease that can switch a transmission other than the transmission to a knob of a transmission lever for switching a predetermined transmission. It was set as the structure of the electronic shift apparatus characterized by providing the speed switch (switch control button).

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on the Example shown by drawing.

First, from the configuration, 1 is a tractor, 2 is a front wheel, and 3 is a rear wheel. The engine 4 is mounted on the front part of the tractor 1, the clutch housing 6 housing the main clutch 5 on the rear part of the engine 4, and the mission case housing the transmission. (8) is speaking. In the mission case 8, a four-speed peripheral gear unit 9, a four-speed sub-shift device 10, and a hydraulically switchable forward and backward switching device for changing the traveling direction of the body are provided. (11) is installed in series before and after. The hydraulic clutch 13 of the forward-backward switching device 11 consists of the forward (F) side hydraulic clutch 13a and the reverse (R) side hydraulic clutch 13b.

In addition, the combination of the peripheral gear 9 and the sub transmission 10 constitutes such that the 16-speed shift stage as shown in the table of FIG. The main gear 9 and the sub transmission 10 are operated by a single shift lever 12. The arm of the shift lever 12 is located next to the cockpit 14 as shown in FIG. 2 and FIG. It is inserted into the guide groove 15a of the H-shaped shift guide 15. When the sub transmission 10 is switched, the clutch pedal 7 is attached to the main transmission 5 so that the shift is performed. That is, if the shift lever 12 is moved back and forth or left and right along the shift guide groove 15a after cutting the main clutch 5, the high speed (H speed), low speed (L speed), medium speed (M speed), and ultra low speed (4 speeds in LL) are achieved. Instead of the main clutch 5, the hydraulic clutch 13 of the forward and backward switching device 11 may be cut off to shift. Since the shift lever 12 is used for timing adjustment (step-up control) for connecting the clutch of the hydraulic clutch 13 or for monitor display, the position detection sensor for detecting the movement on the side of the mission case 8 ( 20) 21 are buried.

3 shows the detailed structure. Two shifter pins 23 and 24 are axially held in two stages in the mission case 8 so as to follow in the front-rear direction and attached to these shifter pins 23 and 24. Shifters 25 and 26 for switching the transmission gears 10 are fitted to each other. 27 and 28 are protrusions integral with the shifter pins 23 and 24, and the upper surfaces of these protrusions 27 and 28 are cut out in a U shape so that the recesses 27a and 28a are formed. It is formed so that the spherical part 12a of the lower end of the shift lever 12 may be inserted into the recessed part 27a and 28a alternatively. Then, when the spherical portion 12a of the shift lever 12 is engaged with the recess 27a (or 28a) and moved in the front-back direction, the shifter 25 (or 26) of the sub transmission 10 It shifts in the front and rear directions to achieve shifting.

At this time, when the shifters 25 and 26 move forward and backward, the position detection sensor 20 in which the cams 25a and 26a integral with the shifters 25 and 26 are embedded in the wall of the mission case 8. (21) is pressed to detect the shift position. Specifically, the detection position is determined by the amount of entrance and exit of the pins 20a and 21a. The position detection sensor 20 detects each position in the H speed-neutral (N) -L, and the position detection sensor 21 is M. Each position in the genus-neutral (N) -LL is detected. 4 is a sectional view showing the main parts of the shift operation unit seen from the front.

In addition, a speed increase pushbutton shift switch 16 and a deceleration shift switch 17 are provided at a gripping portion of the shift lever 12. For example, when the shift speed shift switch 16 is pressed, the speed shift switch 16 is moved from one speed to four speeds. When the gear shift switch 17 for deceleration is sequentially shifted, the gear shift is shifted down from the fourth speed to the first speed. In this way, the shift switches 16 and 17 are appropriately operated to operate the peripheral gear 9 at one speed. Shifts from 4 speeds to 4 speeds.

In this case, the peripheral speed operation is shifted by a no clutch operation, and when the peripheral speed control device 9 is switched by pressing the shifting switches 16 and 17 of the shift lever 12, the forward and backward movements are first performed. The hydraulic clutch 13 of the switching device 11 is switched to a neutral state, and then the piston rods 33 and 34 as actuators for operating the shifters 31 and 32 of the peripheral gear device 9 are operated by hydraulic pressure. Is forcibly moved in the axial length direction (see FIG. 6), and when the shifters 31 and 32 have been electrically detected that they have reached a predetermined shifting position (in this embodiment, the peripheral speed position sensor 49 is detected) Again, the hydraulic clutch 13 of the forward-backward switching device 11 is connected. These switching is controlled by the controller 35 mentioned later.

FIG. 9 is a block diagram illustrating a relationship between a controller 35 constituting the control system, an input means composed of sensors, switches, and an output means such as a solenoid. The controller 35 has solenoids 37, 38, 39, 40 for switching the solenoid valves 18, 19 for operating the shifters 31, 32 of the peripheral gear device 9, and forward and backward movements. Proportional solenoid controlling solenoids 41 and 42 of the solenoid valve 22 for switching the hydraulic clutch 13 of the switching device 11 and the proportional pressure reducing valve 45 for step-up control of the forward and backward switching device 11. 47 is connected. This proportional solenoid 47 controls the timing of connecting the hydraulic clutch 13 by changing the duty ratio of the pulse current. Specifically, in the case of connecting the hydraulic clutch 13, as shown in FIG. 7, in the initial stage of the connection, a pulse of 100% duty for a short time (set 50-100 msec as the initial time) in order to move the piston to the target position quickly. After the current flows, the pulse current value is lowered once, the pressure is lowered, and the duty ratio of the pulse current is gradually raised to smoothly connect the clutch.

In Fig. 9, reference numeral 48 denotes a monitor lamp and 49 denotes a position sensor for detecting the position of the shifter for operating the peripheral gear device 9. In addition, the controller 35 includes a rotation sensor 52 for detecting the rotation speed of the engine 4, a vehicle rotation sensor 53 for detecting the rotation speed of the rear wheel 3, and a lever 30 for forward and backward switching. FR switch (54) installed, buzzer (55) as an alarm, check switch (56) to be pressed when switching to the check mode for checking the operation status of each sensor, and main key switch (57) for supplying power to each part. ) Is connected.

In the controller 35, a program for outputting the shift command in conjunction with the operation of the key switch 57 together with a program for automatic shifting of the peripheral speed gear 9 is written in the storage means (not shown). In other words, when the key switch 57 is turned on to increase the stability when starting the engine and starting the engine, the output command to the peripheral gear device 9 is switched to the low speed side (first speed).

Referring to the control program, in the flowchart shown in FIG. 10, the state of each sensor or switch is first read in step S1, and immediately after the key switch 57 is turned on (step S2). The command to excite this to the 1st speed solenoid 37 of the peripheral gear apparatus 9 is output from 35, and a 1st speed is selected (step S3). For this reason, even if the sub transmission 10 enters at any speed | step stage, since the peripheral gear 9 is switched to the low speed side, a gas does not appear to oscillate at high speed.

Subsequently, when the driver operates the speed increase switch 16 or the speed reduction switch 17 for operating the peripheral speed device 9, the peripheral speed device 9 is switched within the range from the first speed to the fourth speed ( 12 and the sub transmission 10 also operate the shift lever 12 along the guide groove 15a of the H type shift guide 15 to perform a four-speed shift in the range from H to LL. To make it possible. This peripheral speed operation and sub-speed operation are controlled by the subroutine (see Fig. 11) of the " shift change processing " in step S4. In addition to this control, a program (see Fig. 13) for automatically switching the peripheral speed gear 9 when the sub transmission 10 is operated is set. That is, when the sub transmission 10 is switched from the high speed side to the low speed side, the peripheral speed gear 9 switches directly to the fourth speed from the position where it enters, and conversely, the sub transmission 10 is rotated at the low speed side. When shifting up to the high speed side, the peripheral gear apparatus 9 is comprised so that it may shift down to a 1st speed | rate. These are controlled in accordance with the shift stage check in FIG. 8 to prevent the vehicle speed from suddenly going up and down when the shift lever 12 is operated to switch the sub transmission 10.

The " clutch step-up process " indicated by step S5 in the flowchart of FIG. 10 is a subroutine which gradually increases the clutch pressure of the hydraulic clutch 13 to smoothly and quickly connect the clutch.

As is apparent from the above description, in this embodiment, when the key switch 57 is turned on, a command for directly turning the peripheral gear device 9 to the first speed is output from the controller 35, so that the aircraft may move forward or backward at high speed. There is no fear of this, and as a result, a safe electronic shift device is obtained. In this embodiment, the peripheral gear device 9 is configured to switch to the first speed when the key switch 57 is turned on. However, the sub transmission 10 may be configured to switch to the low speed LL speed. Alternatively, the peripheral speed gear 9 and the sub transmission 10 may be switched to the low speed side.

As described above, in the vehicle which transmits the rotational power of the engine to the driving wheels by placing a plurality of transmissions, the shift lever is shifted to a knob of a shift lever that can switch a predetermined transmission. Since it is comprised with the electronic shift apparatus characterized by providing the switch for the increase / deceleration which can switch devices, compared with the conventional apparatus, the structure of an operating system is concise and the whole apparatus can be made cheap.

In addition, the shift operation member is disposed in one place, and as a result, it is possible to efficiently shift the main / sub transmission without removing the hand, and there is no delay in shifting operation. It becomes possible.

Claims (1)

In a vehicle that transmits rotational power of an engine to a drive wheel via a plurality of transmissions, an increase / decrease that can switch a transmission separate from the transmission to a knob of a transmission lever capable of switching a predetermined transmission. Electronic shift device which installed speed switch.