DE10352611A1 - Process for recognizing the slip point of a clutch comprises opening the clutch until a defined differential speed is determined between a drive speed of a drive unit and a driving branch speed of a driving branch - Google Patents

Abstract

Process for recognizing the slip point of a clutch comprises closing the clutch from an open position beyond a starting clutch slip point determined earlier so that defined starting conditions can be determined. The clutch is then opened until a defined differential speed is determined between a drive speed of a drive unit and a driving branch speed of a driving branch. The differential speed is used to determine the clutch position and thus the clutch slip point. Independent claims are also included for: (1) Device for recognizing the slip point of a clutch; and (2) Drive branch, especially for a vehicle, comprising the above device.

Description

The The present invention relates first to a method and a Device for teaching the grinding point of a coupling. Farther The invention also relates to a drive train, in particular for a vehicle.

For the business of clutches or of drive trains with clutches, such as in Vehicles, it is important to check the grinding point of the coupling (coupling point) to know exactly. The coupling grinding point is generally around the point where the clutch starts to grip.

at However, the clutch grinding point is not a constant one Size. Rather, it can the coupling grinding point over the service life or operating time of the coupling vary. For example, it is possible that the coupling grinding point due to external influences, such as temperature and the like, changed. Also, the clutch grinding point will be over the life of the clutch change permanently, for example due to signs of wear and the like happens.

at all control processes the clutch in a drive train, for example in automated Systems such as automated manual transmissions, dual clutch systems and the like, is the Kupplungsschleifpunkt or its Knowledge of crucial importance. Since the grinding point of the clutch on the Operating time varies, it is necessary to adapt this. If such an adaptation is not made, this would result in a series of Lead to disadvantages.

As introductory already executed has been a clutch is usually is a component of a drive train. Drive side is the coupling at least temporarily connected to a drive unit, which is for example an internal combustion engine or the like can act. On the output side, the coupling is connected to a drive train, for example, may have a transmission. In such a Case, the coupling may also be formed as part of the transmission be. The task of the clutch is generally the torque of the drive unit to the drive train, such as a transmission to transfer. If the change of the Kupplungsschleifpunktes not adapted, can do so to lead, that at some point either too little or too much torque is transmitted becomes.

For this reason, a number of solutions have already become known in the prior art, which are concerned with the adaptation of the Kupplungsschleifpunkts. So is in the DE 49 11 850 A1 For example, a method of controlling a clutch effective between a prime mover and a transmission is described. In this case also the coupling grinding point is determined. For this purpose, the clutch is closed from a disengaged, that is open position to a certain position in which, although a moment initiated, this moment is less than that by which a vehicle would be moved. Subsequently, the coupling is at least partially reopened. Another, similar solution is also in the EP 0 725 225 B1 described.

Both known solutions is common that under certain conditions the clutch up closed to detect a certain level of transmission speed and subsequently again completely open becomes. The point determined in this way then becomes an adaptation of the grinding point used.

These known solutions However, they have a number of disadvantages. That's the purpose the Kupplungsschleifpunktes in the known solutions only very inaccurate possible, because the initial conditions, such as the position of the clutch disc on the transmission input shaft, are not defined. Continue to go the acceleration of the transmission input shaft is not in the determination of Kupplungsschleifpunktes with, because no defined speed level the transmission input shaft is present. Finally, the learning takes place the Kupplungsschleifpunktes only when closing the clutch, so for example mechanical hystereses not considered can be.

outgoing The object of the present invention is the object of the prior art underlying, a method and an apparatus for teaching the grinding point to provide a clutch, with the / the state of the art described disadvantages can be avoided. In particular, it should on simple yet reliable Way possible be, teach the grinding point of a clutch exactly or to be able to adapt. Furthermore, a correspondingly improved drive train is to be provided become.

This object is achieved by the method for teaching the grinding point of a coupling with the features of the independent claim 1, the device for teaching the grinding point of a coupling with the features of the independent claim 11 and the drive train with the Features according to independent claim 13. Further advantages, features, details, aspects and effects of the invention will become apparent from the dependent claims and the description. Features and details which are described in connection with the method according to the invention, of course, also apply in connection with the device according to the invention and vice versa. The same applies to the drive train according to the invention.

• a) die Kupplung wird aus einer geöffneten Position bis über einen zu einem früheren Zeitpunkt bestimmten Ausgangs-Kupplungsschleifpunkt hinaus geschlossen, sodass definierte Ausgangsbedingungen geschaffen werden;
• b) die Kupplung wird anschließend so weit geöffnet, bis eine definierte Differenzdrehzahl zwischen einer antriebsseitig von der Kupplung vorherrschenden Antriebsdrehzahl eines Antriebsaggregats und einer antriebsseitig von der Kupplung vorherrschenden Triebstrangdrehzahl des Triebstrangs erfasst wird;
• c) bei der erfassten Differenzdrehzahl wird die Kupplungsposition erfasst und daraus ein Kupplungsschleifpunkt ermittelt.

According to the first aspect of the invention, there is provided a method of teaching the grinding point of a coupling characterized by the steps of:

• a) the clutch is closed from an open position to beyond an initial point of time determined Kupplungsschleifpunkt so defined output conditions are created;
• b) the clutch is then opened so far until a defined differential speed between a driving side of the clutch prevailing input speed of a drive unit and a drive side dominated by the clutch driveline speed of the drive train is detected;
• c) at the detected differential speed, the clutch position is detected and determines therefrom a Kupplungsschleifpunkt.

By the inventive method is an exact adaptation of the clutch grinding point over the Operating life or service life of the coupling possible.

A first difference between the solution according to the invention and the solutions known from the prior art is that the teaching of the coupling grinding point now takes place when the coupling opens. Although the clutch is initially closed, however, the Kupplungsschleifpunkt is determined only when the clutch is opened again. This happens as follows:
The starting point of the method according to the invention is that the clutch is first closed from an open position to above an output clutch grinding point determined at an earlier point in time. It is particularly provided that the clutch is closed well above the previous Kupplungsschleifpunkt out. This starting clutch grinding point has been determined at an earlier point in time, for which it may be provided, for example, that the starting clutch grinding point has been determined in a previously performed run of the method according to the invention. Likewise, of course, it may also be provided that the starting clutch grinding point is such a point that has been determined within the framework of test series and the like. It is only important that the output clutch grinding point is chosen so that in this clutch sufficiently engages and the required or desired torque is transmitted. By closing the clutch beyond such a starting clutch grinding point, it is achieved that starting conditions defined for carrying out the method according to the invention are created.

in the next Process step, the clutch is then opened until, until a defined differential speed between a drive side from the clutch prevailing drive speed of a drive unit and an output side of the clutch prevailing driveline speed of Drivetrain prevails. This differential speed is then detected according to the invention.

Of the Advantage of this approach is that the above-described Differential speed can be determined very accurately. The described Namely, speeds can be determine very accurately.

First, will to determine the speed of a drive unit, in which it For example, be an internal combustion engine or the like can. The drive unit is on the drive side from the perspective of the clutch provided by this. Likewise, the driveline speed of the drivetrain, which is located on the output side of the clutch detected. Of the For example, a powertrain may include a transmission, wherein the Coupling depending on the design as a separate component, as a component of the transmission or the like may be formed.

The Rotational speeds of the drive unit or of the drive train, for example, within the transmission, can be particularly simple Determine way directly or indirectly. These may, for example, appropriate Sensor elements may be provided which the speeds either directly capture, or indirectly by means of which the respective speeds determined by other company sizes can be.

The Determining such speeds is particularly cost feasible, as these speeds are during the operation of a powertrain usually detected anyway become.

From the speed values determined or recorded in this way, a differential speed is subsequently determined. This can be done for example in a control device, which advantageously for this purpose via a computer and appropriate program resources. Again, for example, can be used again on a provided for a drive train central control device on which then the process of the invention can proceed.

As soon as this, very precisely definable, differential speed is reached, In a further method step, the coupling position is detected. From this detected clutch position finally becomes a Kupplungsschleifpunkt determined. The detection of the clutch position can turn directly or indirectly, for example by means of suitable sensor elements, respectively. The detected clutch position can - similar to the detected speed values - to a Transfer control device and there further processed or evaluated.

By the inventive method It is therefore possible in a simple and cost-effective manner, the Determine the grinding point of a coupling exactly.

Advantageous can be provided that from the at the detected differential speed clutch position detected a first Kupplungsschleifpunkt at opening Coupling is determined.

Preferably can then re-clutch in a further step closed until a defined speed of the powertrain is detected. The detection of the driveline speed, for example in the manner as described above directly or indirectly via suitable Sensor elements take place. At this detected motive jet speed At the same time the coupling position is detected, for example in the manner described above by means of suitable sensor elements. From this detected clutch position can then be a second Kupplungsschleifpunkt at closing Coupling can be determined.

Advantageous can drive speed as the transmission speed of a drivetrain located transmission are detected. Of course, to carry out the Process also speeds of other components located in the drive train be recorded.

If the transmission rotational speed is detected as the drive train rotational speed, the inflection point of the transmission rotational speed can advantageously be detected as the defined drive train rotational speed for determining the second clutch slip point. The turning point of the transmission speed is the size described below:
A clutch generally has the task to bridge the speed difference between the drive unit and the drive train, such as a transmission. When the clutch is opened, the transmission speed drops compared to the engine speed. When the clutch is then closed again and begins to grip, the transmission speed increases again. This point, at which the transmission speed increases again, is a turning point for the transmission speed. Since the renewed increase in the transmission speed then occurs when the clutch starts to grip, it can therefore be concluded from the turning point of the transmission speed also on the grinding point of the clutch.

Advantageous can be provided that the difference of the values for the first and second Kupplungsschleifpunkt is determined and the resulting the hysteresis in the actuation path the coupling is determined. With the method according to the invention it now also possible in contrast to the solutions known from the prior art, to take into account the hystereses, in particular mechanical hystereses. As with the method according to the present Invention is started from a defined starting position can such a hysteresis in a particularly simple and accurate way measured become. The hysteresis in the present case is general by a characteristic difference between the characteristics of the clutch in the opening and closing Status.

Preferably can the determined data, which are, for example, on the drive side and / or On the output side, clutch speed values recorded by the clutch and / or Values of the determined first clutch grinding point and / or values the determined second Kupplungsschleifpunkts and / or determined Values of hysteresis can act, at least temporarily, in at least a storage device to be stored. In this case, the storage device formed for example as part of a control device be. It is also conceivable that the storage device as a separate Component is formed, wherein a control device in such Case at least temporarily accesses such a memory device. The storage of the determined data has the particular advantage that latter Maintenance, repair and the like easier become. In such a case can the stored data is read from the memory device and subsequently be evaluated.

Advantageously, it can be provided that the currently detected and / or determined data is compared with reference data stored in at least one memory device. In this way, possible deviations can be detected quickly and easily. The stored reference values may, in particular, be values of clutch grinding points determined at an earlier point in time, which in such a case is particularly advantageous as off gangs-Kupplungsschleifpunkte can be used.

For example can be provided that the at least one Kupplungsschleifpunkt continuously, in particular during each coupling process, determined becomes. Likewise, of course also conceivable that the determination of the at least one Kupplungsschleifpunkts takes place at certain intervals. For example, but not exclusively, it can be provided that the determination of the at least one clutch grinding point or learning the grinding point of the coupling at every starting process of a vehicle takes place. Likewise, of course, too be provided that a teaching the grinding point of a clutch always done is when the drive train in which the corresponding clutch is over was not in operation for a certain period of time. The frequency, with which the grinding point of the coupling is taught, can be arbitrary can be varied so that the invention is not limited to specific process cycles.

As well the invention is not limited to carrying out the process at certain Coupling types limited. However, the method can advantageously be used to teach in the grinding point at least one clutch of an automated manual transmission or a dual-clutch transmission can be used.

According to the second Aspect of the invention is a device for teaching the grinding point a clutch provided. This first has one or more sensor elements for Detecting rotational speeds, at least one sensor element for detecting the coupling position and at least one with the sensor elements at least temporarily connected control device. About the Sensor elements, at least temporarily with the control device are connected or communicate with this, the corresponding Values depending on the design of the sensor elements either directly or be detected or determined indirectly. The device for Teaching the grinding point of a clutch according to the invention by in that they comprise means for carrying out the method as described above inventive method having.

One particular advantage of the device according to the invention is that this largely off Components may be formed, which are used to operate a drive train anyway required. In this way, the device can especially inexpensive and easy to be realized. Regarding the implementation of the Method required means within the device is to the above-described embodiments of the method according to the invention fully referenced and referenced.

Advantageous can also be provided that the device at least a memory device for at least temporarily storing has detected and / or recorded data.

According to one Another aspect of the invention is a drive train, in particular for a vehicle, provided with at least one coupling, at least one on the drive side of this provided drive unit, in particular an internal combustion engine, a driven side of this provided Driveline and with a device according to the invention as described above for teaching the grinding point of the coupling.

there can be provided in particular that in the drive train at least a transmission, in particular an automated manual transmission or a dual-clutch transmission is provided. In such a case In particular, the clutch may also be part of the transmission.

The Invention will now be described with reference to an embodiment with reference closer to the enclosed drawing explained. The only figure shows a diagram, in the lower part the course of the driveline speed in the form of a transmission input shaft speed, and in the upper part of the course of the coupling position shown is. On the basis of this diagram, the method according to the invention is described below explained.

First, the clutch is from an open position 1 until beyond an earlier determined starting clutch point 2 Beyond closed, which by point 3 is shown. In this way defined starting conditions are created. Subsequently, the clutch is opened so far until a defined differential speed between a drive side prevailing from the clutch input speed of an engine and the output side dominated by the clutch transmission input speed is detected. At the detected differential speed (Δn (mot.get.)), The clutch position is detected and from this a first clutch slip point 4 determined. In a further step, the clutch is then closed again until a defined speed of the transmission input shaft is detected. At this detected transmission input shaft speed, the clutch position is detected and from the detected clutch position, a second Kupplungsschleifpunkt 5 determined at closing clutch. In addition, the difference of the values for the first 4 and second 5 Clutch grinding point determined and used to determine the hysteresis H in the actuation path of the clutch.

By the present invention will be particularly simple and yet accurate way possible the grinding point of a clutch over to adapt their service life or service life. Farther can the system behavior of the clutch or the drive train be significantly improved because the Kupplungsschleifpunkt with a increased Accuracy can be determined or taught and since an occurring hysteresis, in particular a mechanical hysteresis, also considered can be.

Claims (14)

Method for teaching the grinding point of a Clutch characterized by the following steps: a) the coupling will be out of an open Position up above one to one earlier Closed at the time point of departure of certain initial coupling point, so that defined starting conditions are created; b) the coupling will follow so open until a defined differential speed between a drive side from the clutch prevailing drive speed of a drive unit and a driveline speed prevailing on the output side of the clutch a driveline is detected; c) at the detected differential speed the coupling position is detected and from this a coupling grinding point determined. Method according to claim 1, characterized in that that from the clutch position detected at the detected differential speed a first Kupplungsschleifpunkt determined when opening clutch becomes. Method according to claim 1 or 2, characterized then the coupling in a subsequent step again closed until a defined speed of the drive train is detected that at this detected driveline speed the Clutch position is detected and that from the detected clutch position a second Kupplungsschleifpunkt at closing clutch is determined. Method according to one of claims 1 to 3, characterized that as the drive train speed, the transmission speed of one in the drive train located transmission is detected. Method according to claim 4, as far as claim 3 referred back, characterized in that as a defined drive train speed for determining the second Kupplungsschleifpunkts the turning point the transmission speed is detected. Method according to one of claims 3 to 5, characterized that the difference of the values for the first and second Kupplungsschleifpunkt is determined and that from this the hysteresis in the actuation path of the clutch is determined. Method according to one of claims 1 to 6, characterized that the determined data, in particular the drive side and / or The speed values recorded on the output side by the clutch and / or the values of the determined first clutch grinding point and / or the values of the determined second clutch grinding point and / or the determined values of the hysteresis at least temporarily in at least a storage device to be stored. Method according to one of claims 1 to 7, characterized that the currently detected and / or determined data with in at least a reference device stored reference data compared become. Method according to one of claims 1 to 8, characterized that the determination of the at least one Kupplungsschleifpunkts continuously, in particular with each coupling process, or in certain Intervals take place. Method according to one of claims 1 to 9 for teaching the Grinding point of at least one clutch of an automated manual transmission or a dual-clutch transmission. Device for teaching the grinding point of a Coupling, with one or more sensor elements for detecting Speeds, at least one sensor elements for detecting the clutch position and at least one with the sensor elements at least temporarily connected control device, characterized in that the device Means of implementation of the method according to any one of claims 1 to 10. Device according to claim 11, characterized in that that at least one memory device for at least temporary Storing determined and / or recorded data provided is. Drive train, in particular for a vehicle, with at least one clutch, at least one drive side provided by this drive unit, in particular an internal combustion engine, a driven side provided by this drive train and with a device for teaching the grinding point of the clutch according to claim 11 or 12. Drive train according to claim 13, characterized in that that in the drive train at least one transmission, in particular an automated Manual transmission or a dual-clutch transmission, is provided.