DE102015218246A1 - Method and device for generating a warning signal in a drive train of a vehicle - Google Patents

Abstract

Method for generating a warning signal in a drive train of a vehicle, with which via an automated clutch (3) a torque from a drive motor (2) to a transmission (4) or partial transmission with multiple gears of a vehicle is transmitted, which of the clutch ( 3) transmitted torque is changed depending on the degree of opening of the clutch and wherein the gear is selected by the driver.

Description

The invention relates to a method having the features according to the preamble of claim 1 and a device having the features according to the preamble of claim 10.

Field of application and purpose of the invention are vehicles with clutch-by-wire system.

From the DE 10 2007 045 031 A1 For example, a method for warning of imminent overuse of a vehicle driveline is known, wherein the vehicle driveline includes an internal combustion engine, an electric machine, at least one clutch, and means for determining a variable indicative of an overload of the engine, electric machine, or clutch. In the case of detections of imminent overuse, the electric machine, which is rotatably connected to an output shaft driving at least one vehicle wheel, is activated in such a way that an alternating torque is introduced in the drive train.

The DE 198 15 259 A1 discloses a vehicle for controlling an automated clutch. Upon detection of an imminent danger situation in the vehicle, the torque transmitted by the clutch remains unaffected in a first time period, while in a subsequent second time phase, the torque transmittable by the clutch is changed in time, for example, pulsating, driven. In a third time phase, the torque transmitted by the clutch is increased until the engine speed exceeds a threshold value. This has the advantage that in the first time phase, a predetermined period of time is waited in which the driver can react to the critical situation himself. In the other two time phases, a control intervenes, during which first a gentle warning by jerking and later a clearly noticeable warning by jerking the vehicle is derived.

According to the DE 10 2011 104 085 A1 a corresponding jerking action is triggered via a clutch of the vehicle when a fatigue of the driver is detected.

From the DE 196 02 006 A1 a device and a method for controlling a torque transmission system are known in which a protective measure is initiated in an overload of the torque transmission system, which is designed as a coupling. In this case, the control unit determines the friction energy input in the friction surfaces of the clutch as a function of time and at least one temperature of the clutch as a function of time and at least compares the temperature with at least one limit, wherein the control unit initiates a protective measure when the limit value is exceeded. This has the disadvantage that the protective measure is really only initiated when the overload condition has already been reached.

With clutch-by-wire, the clutch actuation request is picked up by a sensor on the pedal and electrically transmitted to an actuator, which carries out the clutch actuation itself. As a result, engagement and disengagement can be carried out in a controlled manner (cf. 2 ).

The gear selection itself can not hit the system in a pure clutch-by-wire, that is, the driver selects the gear. Thus, even with clutch-by-wire can not be prevented that is approached in 2nd gear.

The present invention is based on the object of proposing a method which makes the driver appear a start in 2nd gear as unattractive.

This object is achieved by a method having the features according to claim 1 and by a device having the features according to claim 10.

According to the invention, therefore, a method is provided for generating a warning signal in a drive train of a vehicle with which an automated clutch torque is transmitted from a drive motor to a transmission or partial transmission with multiple gears of a vehicle, wherein the torque transmitted by the clutch depends on the degree of opening the clutch is changed and wherein the gear is selected by the driver. According to the invention, it is provided that in the presence of a critical driving situation, a predetermined change in the torque transmitted by the clutch is triggered as a warning signal to the driver to leave the critical driving situation.

In a particularly preferred embodiment of the invention, it is provided that a start-up attempt is detected when the second gear or a higher gear of the transmission is engaged as a critical driving situation.

In a preferred embodiment of the invention it is provided that the automated clutch is a clutch-by-wire system.

In a further preferred embodiment of the invention, it is provided that in a starting attempt in critical driving situation opening and closing the clutch is executed as a warning signal to the driver.

In a further particularly preferred embodiment of the invention, it is provided that in a starting attempt in a critical driving situation a repeated opening and closing of the clutch is performed, such that it comes to a rocking of the vehicle as a warning signal to the driver.

Alternatively or additionally, it is provided in a further particularly preferred embodiment of the invention that an opening attempt in a critical situation, an opening and closing of the clutch is carried out, such that when closing the clutch almost to a stalling of the drive motor ( 2 ) of the vehicle comes as a warning signal to the driver.

In a further particularly preferred embodiment of the invention, it is provided that opening and closing of the clutch is carried out in a starting attempt in a critical situation, such that when closing the clutch to a lowering of the engine speed below the idle speed of the drive motor as a warning signal to the driver comes.

In a further particularly preferred embodiment of the invention, it is provided that the warning signal to the driver is maintained until the driver leaves the critical driving situation.

In a further particularly preferred embodiment of the invention, it is provided that an optical and / or acoustic warning signal is output simultaneously with the opening and closing of the clutch.

In terms of device technology, the o.g. Problem solved by the following device.

According to the invention, a device is provided for generating a warning signal in a drive train of a vehicle, with which an automated clutch, which is actuated by a clutch actuator, which is controlled by a clutch control unit, a torque from a drive motor to a transmission or partial transmission with multiple gears of a Vehicle is transmitted, wherein the torque transmitted by the clutch is changed depending on the degree of opening of the clutch and wherein the gear selection is made by the driver. According to the invention it is provided that the device of the o.g. process according to the invention performs.

In this way, the driver is made a start in 2nd gear or even in an even higher gear unattractive.

What advantages and advantageous embodiments of the invention are the subject of the following figures and their description.

They show in detail:

1 a schematic representation of a motor vehicle with an internal combustion engine,

2 a schematic diagram of a clutch-by-wire system.

1 shows a schematic representation of a motor vehicle which is drivable by means of a drive train. The powertrain 1 includes an internal combustion engine 2 and a clutch 3 for transmission of one by the internal combustion engine 2 provided torque. The coupling 3 is doing a gearbox 4 guided, over which the of the internal combustion engine 2 generated torque on an output shaft 5 and thus on the drive wheels 6 of the motor vehicle is transmitted. The internal combustion engine 1 is by means of a motor control 7 , for example, a determination device 8th to determine the clutch temperature may have controllable.

The coupling 3 is part of a clutch by wire system, which in 2 is shown in principle. In such a clutch-by-wire system is a clutch pedal 9 that a pedal simulator 10 etc. has a clutch control unit 12 with a clutch actuator 11 electrically connected. The clutch actuator 11 leads depending on the clutch pedal 9 and the clutch control unit 12 an actuation of the clutch 3 out. In this case, the clutch actuator 11 with the clutch 3 be electrically, pneumatically or hydraulically connected. A clutch by wire system is an automated clutch in which the clutch 3 via the clutch control unit 12 as well as the clutch actuator 11 with the clutch pedal 9 is manually operated.

Through the clutch control unit 12 For example, a warning jerking on the clutch 3 although this is transmitted through the clutch pedal 9 - So the driver - is not specified, for example, to alert the driver to overheat the clutch.

As with clutch-by-wire systems can not be prevented that the driver z. B. anfährt in second gear or even higher gear, the driver can intentionally uncomfortable Directions to be "educated" to refrain from such trips.

It is conceivable, for example, to close the clutch very quickly and to reopen it in order to provoke a strong rocking when starting up.

Alternatively, an "almost stalling" of the vehicle can be performed.

The aim of the uncomfortable approach should be to make the driver unattractive in the future, the start in 2nd gear.

LIST OF REFERENCE NUMBERS

1

 powertrain

2

 internal combustion engine

3

 clutch

4

 transmission

5

 output shaft

6

 drive wheel

7

 motor control

8th

 determiner

9

 clutch pedal

10

 pedal simulator

11

 clutch actuator

12

 Clutch control unit

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• DE 102007045031 A1 [0003]
• DE 19815259 A1 [0004]
• DE 102011104085 A1 [0005]
• DE 19602006 A1 [0006]

Claims (10)

Method for generating a warning signal in a drive train of a vehicle, with which by means of an automated clutch ( 3 ) a torque from a drive motor ( 2 ) on a transmission ( 4 ) or partial transmission with several gears of a vehicle is transmitted, whereby by the clutch ( 3 ) transmitted torque is changed depending on the degree of opening of the clutch and wherein the gear selection is carried out by the driver, characterized in that in the presence of a critical driving situation, a predetermined change of the clutch ( 3 ) transmitted torque as a warning signal to the driver to leave the critical driving situation is triggered. Method according to one of the preceding claims, characterized in that a start-up attempt is detected with a second gear engaged or a higher gear of the transmission as a critical driving situation. Method according to one of the preceding claims, characterized in that the automated coupling ( 3 ) is a clutch-by-wire system. Method according to one of the preceding claims, characterized in that in a starting attempt in a critical driving situation, an opening and closing of the clutch is executed as a warning signal to the driver. Method according to one of the preceding claims, characterized in that in a starting attempt in critical driving situation repeated opening and closing of the clutch is performed, such that it comes to a rocking of the vehicle as a warning signal to the driver. Method according to one of the preceding claims, characterized in that in a start-up attempt in a critical situation, an opening and closing of the clutch is performed, such that when closing the clutch almost to a stalling of the drive motor ( 2 ) of the vehicle comes as a warning signal to the driver. Method according to one of the preceding claims, characterized in that in a starting attempt in a critical situation, an opening and closing of the clutch is performed, such that when closing the clutch to a reduction in the engine speed below the idle speed of the drive motor ( 2 ) comes as a warning signal to the driver. Method according to one of the preceding claims, characterized in that the warning signal to the driver is maintained until the driver leaves the critical driving situation. Method according to one of the preceding claims, characterized in that an optical and / or acoustic warning signal is output simultaneously with the opening and closing of the clutch. Device for generating a warning signal in a drive train of a vehicle, with which an automated clutch ( 3 ), which is controlled by a clutch actuator ( 11 ) operated by a clutch control unit ( 12 ), a torque from a drive motor ( 2 ) on a transmission ( 4 ) or partial transmission with several gears of a vehicle is transmitted, whereby by the clutch ( 3 ) is changed depending on the degree of opening of the clutch and wherein the gear selection is carried out by the driver, characterized in that the device performs a method according to one of the preceding claims.

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