DE102018128867A1 - Method for learning a power-free gear position of a manual transmission of a vehicle - Google Patents

Abstract

The invention relates to a method for learning a power-free gear position of a manual transmission of a vehicle, which is actuated by a clutch system and in which a shift intention on a gear lever and / or the gear position of the manual transmission is detected by sensors, the respective gear being learned when learning the respective gear position is switched. In order to be sure that the shift lever is really power-free, the gear position is learned when the drive motor of the vehicle is started.

Description

The invention relates to a method for learning a power-free gear position of a manual transmission of a vehicle, which is actuated by a clutch system and in which a shift intention on a gear lever and / or the gear position of the manual transmission is detected by sensors, the respective gear being learned when learning the respective gear position is switched.

Gear sensors are used in vehicles with a manual gearbox and an automated clutch, in which the clutch is not actuated by a clutch pedal, but rather automatically by a clutch actuator. This gear sensor system detects, for example, the gear engaged or the position of the switching device or an intention of the driver to change the gear. This is necessary to control the clutch actuator accordingly. Due to tolerances in the sensors, the transmission components, during assembly of the individual components and the like, it is common to teach the sensors in the fully assembled vehicle so that absolute tolerances are compensated for. It is necessary to leave the gear lever in a non-force position during the learning process.

From the as yet unpublished German patent application of the applicant with the file number 10 2018 109 074.9 a method for learning the neutral / gear position of a manual transmission of a vehicle is known, in which the shift lever is force-free during the learning process. In this method, the manual transmission is operated by a clutch pedal-free clutch system, in which an intention to shift to a shift lever and a gear position is detected by sensors, the respective gear being shifted when learning by means of the shift lever. In order to recognize the absence of force in the gear position, the position values supplied by the shift lever sensor and / or the gear position sensor during the shifting process are evaluated over a predetermined period of time, and if the position values change from a threshold value, it is concluded whether the shift lever is force-free or not. The disadvantage here is that such an evaluation is very time-consuming. On the other hand, there is always the risk that the responsible fitter will touch the gear lever and therefore the correct power-free position will not be learned.

The invention has for its object to provide a method in which it is ensured that the shift lever is force-free during the learning process.

According to the invention, the object is achieved in that the gear position is learned when the drive motor of the vehicle is started. This ensures that the fitter does not have his hand on the shift lever, but is busy manually starting the drive motor of the vehicle.

The gear position is advantageously learned while a drive motor of the vehicle is started. This reliably ensures that the shift lever is free of force during the teach-in process.

In one embodiment, the gear position is learned immediately before the drive motor starts. This prevents the sensors from being influenced by the vibrations caused by the drive motor.

The drive motor is advantageously started by actuating an ignition lock. The fitter's hand is on the ignition key. In an alternative, the drive motor is started by pressing a start button. Since the start button or the ignition switch are located on the same side of the vehicle as the shift lever, the fitter will always use his hand to operate the start button, which is otherwise used to operate the shift lever. This ensures that the gear lever remains force-free.

In one embodiment, a neutral position of the manual transmission is engaged before the gear position is taught in to carry out the drive motor start. For safety reasons, inserting the neutral position is of particular importance to prevent the vehicle from rolling away during the teach-in process. At the same time, by inserting the neutral position before starting the engine, there is no need to learn the neutral position of the gear sensor system, which saves valuable time when teaching.

In one variant, the learning routine acknowledges the learning process with an error if the drive motor is not started. This indicates the fact that the shift lever is not power-free due to the engine not starting. The learning process is interrupted by this error display and storage of the recorded position values is prevented.

In one embodiment, the learning routine is carried out when the manual transmission is started up or put back into operation. This ensures that the correct position values of the sensors for the detection of a lack of force in the gear position are known after each intervention in the transmission.

The invention permits numerous embodiments. One of these will be explained in more detail with reference to the figures shown in the drawing.

• 1 eine Prinzipdarstellung eines Handschaltgetriebes mit automatisierter Kupplung,
• 2 eine vereinfachte Darstellung des Handschaltgetriebes nach 1 zur Gangerkennung,
• 3 eine Ausführungsform zur Durchführung des erfindungsgemäßen Verfahrens.

Show it:

• 1 a schematic diagram of a manual transmission with an automated clutch,
• 2nd a simplified representation of the manual transmission 1 for gear detection,
• 3rd an embodiment for performing the method according to the invention.

In 1 is a schematic diagram of a gearbox with an electronic clutch system 1 shown for a motor vehicle, in which between a drive motor 2nd and a gear 3rd a clutch 4th is arranged. The gear 3rd is with the clutch 4th via a transmission input shaft 5 connected while the transmission output via a transmission output shaft 6 to the vehicle wheels 7 leads. The coupling 4th is from one, an electric motor 8th comprehensive actuator 9 actuated, the electric motor 8th a piston 10th axially actuated in a master cylinder, by means of which a hydraulic fluid to a slave cylinder 11 is promoted, creating a piston 12 of the slave cylinder 11 the coupling 4th operated. The actuator 9 is done by a control unit 13 controlled.

How out 2nd shows an arrangement 14 the control unit 13 with a shift lever sensor 15 which is connected to a shift lever operated by the driver 16 is arranged. The gear lever 16 is with an internal circuit 17th of the transmission 3rd consisting of a switching rail 18th and a shift fork 19th , connected. The shift lever is connected 16 via an external circuit 20th having a train 21st for the shift movement and a train 22 for the selection movement on the gearbox 3rd transmits. The control unit 13 is with two transmission path sensors, which are on the transmission 3rd are positioned, connected to a gear shift sensor switching 23 and selecting a transmission path sensor 24th are present to be accurate through the movement of the shift lever 16 changed positions of the shift fork 19th in the shift rail 18th to be able to detect.

With automated clutch systems 1 the driver's intention to shift is recognized by the fact that the driver has one hand on the shift lever 16 puts what through the shift lever sensor 15 is detected. In order to achieve reliable shift intention detection, the gearbox is put into operation in a learning process 3rd Position values of the shift lever sensor 15 , the transmission path sensor switching 23 and selecting the transmission path sensor 24th learned.

In 3rd An embodiment for performing the method according to the invention is shown. Before the learning routine for learning the position values of the shift lever sensor 15 and shifting the transmission path sensor 23 and select the transmission path sensor 24th is called, the gearbox 3rd move to a neutral position. Then the learning routine is started. The learning routine, by means of which the gear positions are learned, is carried out if the drive motor at the same time 2nd the vehicle is started. Starting the drive motor 2nd can be done by pressing the start button once 25th is pressed, causing the hand that is normally the shift lever 16 actuated, the start button 25th is facing. Alternatively to the start button 25th can also be turned an ignition key in an ignition lock, not shown. This ensures that the gear lever during the learning routine of the gear positions 16 is powerless.

The learning routine described can be carried out both when the manual transmission is put into operation for the first time at the end of the vehicle plant or when the manual transmission is restarted in a workshop. It can be used with conventional clutch systems as well as with automated clutch systems with or without a clutch pedal.

Reference symbol list

1

Coupling system

2nd

Drive motor

3rd

transmission

4th

clutch

5

Transmission input shaft

6

Transmission output shaft

7

Vehicle wheels

8th

Electric motor

9

Actuator

10th

piston

11

Slave cylinder

12

piston

13

Control unit

14

arrangement

15

Shift lever sensor

16

Gear lever

17th

Internal circuit

18th

Shift rail

19th

Shift fork

20th

External circuit

21st

Train for switching movement

22

Train for dialing movement

23

Gear shift sensor switching

24th

Select transmission path sensor

25th

Start button

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102018109074 [0003]

Claims (8)

Method for learning a power-free gear position of a manual transmission of a vehicle, which is actuated by a clutch system (1) and in which an intention to shift on a gear lever (16) and / or the gear position of the manual transmission (3) by sensors (15; 23, 24) is detected, the respective gear being switched when learning the respective gear position, characterized in that the gear position is learned when the drive motor of the vehicle is started. Procedure according to Claim 1 , characterized in that the gear position is learned while a drive motor (2) of the vehicle is started. Procedure according to Claim 1 characterized in that the gear position is learned immediately before the start of the drive motor (2) of the vehicle. Procedure according to Claim 1 , 2nd or 3rd , characterized in that the drive motor (2) is started by actuating an ignition lock. Procedure according to Claim 1 , 2nd or 3rd characterized in that the drive motor (2) is started by actuating a start button (25). Method according to at least one of the preceding claims, characterized in that a neutral position of the manual transmission (3) is engaged before teaching in the gear position to carry out the engine start. Method according to at least one of the preceding claims, characterized in that a learning routine acknowledges the learning process with an error if the drive motor (2) is not started. Method according to at least one of the preceding claims, characterized in that the learning routine is carried out when the manual transmission (3) is started up or put back into operation.

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