DE102018107760A1 - Method for operating a clutch in a vehicle with a manual transmission - Google Patents

Abstract

The invention relates to a method for operating a clutch in a vehicle with a manual transmission, wherein the manual transmission (1) is manually operated and the clutch (4) is automatically operated by a clutch actuator (9). In a method in which the shift intent is also reliably detected, the clutch (4) is opened in response to a driving mode of the vehicle after detection of a switching intent of the manual transmission (1).

Description

The invention relates to a method for operating a clutch in a vehicle with a manual transmission, in which the manual transmission is operated manually and the clutch is automatically operated by a clutch actuator.

In transmissions with an electronic clutch management (EKM) in the automated control of the clutch carried out an engine intervention. This allows the driver z. B. to perform a gear shift via a shift lever, without first to make the drive train of the vehicle by removing the accelerator pedal torque-free. The clutch is not automatically actuated by a clutch pedal but by a clutch actuator.

The invention has for its object to provide a method for operating a clutch in a vehicle, in which the time for opening the clutch is reliably determined during a switching operation.

According to the invention the object is achieved in that after detection of a switching intent of the manual transmission, the clutch is opened in response to a driving mode of the vehicle. As a result, the electronic clutch management system is signaled by electronic signals when exactly the clutch is to be opened, so that the manual gearshift operation can be performed by the driver.

Advantageously, the shift intent is detected by a shift intention sensor. By means of this shift intention sensor, a physical quantity which is exerted by the touch of a shift lever of the manual transmission by the driver on the shift lever, can be detected, and thus the driver's shift intention to be recognized.

In one refinement, a displacement and / or force sensor arranged on the shift lever of the manual transmission is used as the shift intention sensor. In this particularly cost-effective variant, existing displacement sensors are used in the manual transmission for detecting the driver's intention to shift.

In a further development, the output signal of the shift intention sensor is compared with a threshold value, wherein when the threshold value is exceeded, an existing shift intent is concluded. In the case of physical variables, such as, for example, a force applied to the shift lever or a travel covered by the shift lever, the intention to shift can be detected particularly easily.

In one variant, the threshold value is changed as a function of the driving mode of the vehicle. Since, depending on the driving mode of the vehicle, the sensitivity varies from a detected shift intention to the opening of the clutch, the threshold value must be adjusted accordingly.

In one embodiment, a fixed threshold is provided for each drive mode. Thus, only one threshold value is possible when the drive mode is detected. The threshold value can alternatively be filtered or derived independently of other vehicle parameters.

In one alternative, the threshold value is varied in a given driving mode of the vehicle in dependence on predetermined vehicle parameters. In this case, a vehicle speed or a damping of the vehicle can be used in particular as a vehicle parameter.

Advantageously, a sensitivity is varied depending on the determined driving mode, which describes a relationship between the opening of the clutch of an actuation of the shift lever by the driver. This ensures that the shift intent is detected early enough to open the clutch early enough for the shift. On the other hand, the shift intent may not be recognized too early, otherwise the clutch is already open when the driver has not yet indicated the shift intent.

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

• 1 eine Prinzipdarstellung eines elektronischen Kupplungsmanagementsystems,
• 2 ein Ausführungsbeispiel für eine Verschaltung des elektronischen Kupplungsmanagementsystems zur Durchführung des Verfahrens.

Show it:

• 1 a schematic diagram of an electronic clutch management system,
• 2 an embodiment of an interconnection of the electronic clutch management system for performing the method.

In 1 is a schematic diagram of an electronic clutch management system 1 shown in which between a motor 2 and a gearbox 3 a clutch 4 is arranged. The gear 3 is with the clutch 4 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 4 becomes of one, an electric motor 8th comprehensive clutch actuator 9 operated, the electric motor 8th a piston in a master cylinder 10 operated, by means of which a hydraulic fluid to a slave cylinder 11 is promoted, causing the piston 12 the slave cylinder 11 the coupling 4 actuated. The clutch actuator 9 is doing by a control unit 13 driven. Alternatively, a non-illustrated clutch actuator may be formed electromechanically, in which the electric motor drives a plunger to adjust the clutch.

In 2 is a simplified representation of the interconnection of the clutch management system 1 shown. The control unit 13 that in the clutch actuator 4 is included with a shift intention sensor 14 , the gear lever 15 the gearshift 16 is arranged, electrically connected. At the same time there is a connection of the control unit 13 with a vehicle electronics 17 , From the signals of the shift intention sensor 14 and the vehicle electronics 17 , which in particular outputs signals for a current driving mode of the vehicle, determines the control unit 13 of the clutch actuator 9 the intention of the driver to shift depending on the driving mode.

To the switching intent of the shift intention sensor 14 to recognize exactly, is the output of the shift intent sensor 14 with one in the control unit 13 stored threshold value compared. This threshold is different for each driving mode. The threshold value can be fixed for each drive mode. Alternatively, however, it is also possible for the threshold value to be varied as a function of vehicle parameters that change in a predefined driving mode. Thus, as a function of the current driving mode of the vehicle, it is determined by variation of the threshold value when an actual switching intention of the driver is detected by the shift intention sensor.

As a driving mode, for example, a sports mode of the vehicle can be set, in which the threshold value is chosen so that the shift intent is detected early and the driver is thus a very fast switching is possible. In a comfort or off-road mode, the threshold is selected so that the shift intent is recognized later, so that the driver can easily put his hand on the shift lever or hold to a certain extent on the shift lever. By setting the respective threshold so the sensitivity, when the clutch 4 in relation to the operation of the shift lever 15 varied by the driver.

LIST OF REFERENCE NUMBERS

1

electronic clutch management system

2

engine

3

transmission

4

clutch

5

Transmission input shaft

6

Transmission output shaft

7

vehicle wheels

8th

electric motor

9

Kupplungaktor

10

Master cylinder

11

slave cylinder

12

piston

13

control unit

14

Shift intention sensor

15

gear lever

16

gear shift

17

vehicle electronics

Claims (8)

Method for operating a clutch in a vehicle with a manual transmission, wherein the manual transmission (1) is operated manually and the clutch (4) is automatically operated by a clutch actuator (9), characterized in that after detection of a switching intention of the manual transmission (1 ) the clutch (4) is opened in response to a driving mode of the vehicle. Method according to Claim 1 , characterized in that the switching intent is detected by a shift intention sensor (14). Method according to Claim 2 , characterized in that as switching intention sensor (14) to a shift lever (15) of the manual transmission (1) arranged Weg- and / or force sensor is used. Method according to Claim 2 or 3 , characterized in that the output signal of the shift intent sensor (14) is compared with a threshold, which is closed when exceeding the threshold value on an existing shift intent. Method according to at least one of the preceding claims, characterized in that the threshold value is changed as a function of the driving mode of the vehicle. Method according to Claim 4 or 5 , characterized in that a fixed threshold is provided for each driving mode. Method according to Claim 4 or 5 , characterized in that the threshold value is varied in a predetermined driving mode of the vehicle in dependence on predetermined vehicle parameters. Method according to at least one of the preceding claims, characterized in that a sensitivity is varied depending on the determined driving mode, which describes a relationship between the opening of the clutch (4) an actuation of the shift lever (15) by the driver.

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