Process and device for the reduction of clutch-grabbing oscillations in a motor vehicle drive train

Abstract

Process for reducing clutch-grabbing oscillations in a motor vehicle drive train having a drive motor, clutch and another drive train, in which process the moment transmitted by the clutch for the control of an actuator that operates an operating member of the clutch when oscillations occur is changed such that oscillations are diminished, where an electric voltage driving the actuator is modulated according to the formula:

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained below with the help of diagrammatic illustrations by way of example and with further details, in which:

FIG. 1 is a block diagram of a known motor vehicle drive train with parts of its control device; and,

FIG. 2 is an electric motor clutch actuator with control device.

Claims

1. A process for the reduction of clutch-grabbing oscillations in a motor vehicle drive with a drive train that can be connected by a clutch with another drive train in a torque-transmitting manner in which process the moment, transmitted by the clutch, is so changed by controlling an actuator that operates an operating member of the clutch in case of the occurrence of clutch-grabbing oscillations in such a manner that the clutch-grabbing oscillations are diminished, wherein an electric voltage, determining the operation of the actuator, is modulated in accordance with the following formula: UM=UMSt*w+UMR*(1−w), wherebyw is a weighting factor that can assume values of between 0 and 1,UMSt is a modulation voltage that is controlled in a defined manner by an actuator model and a required travel modulation, and,UMR is a modulation voltage regulated by a control device, which voltage is a magnitude that characterizes an operating state of the clutch on the basis of the deviation between a required value and the actual value.

2. The process recited in claim 1, wherein the actuator model is given via the following equation: {umlaut over (x)}−k*{dot over (x)}=KU*U, whereby

3. The process recited in claim 2, wherein a required modulation function xsM(t) is inserted in equation {umlaut over (x)}−k*{dot over (x)}=KU*U and that the controlled modulation voltage UMSt is given by the resultant voltage U(t).

4. The process recited in claim 3, wherein the modulation voltage UMSt is multiplied with a factor depending on the amplitude of the clutch-grabbing oscillation.

5. The process recited in claim 3, wherein an offset voltage is added to the modulation control voltage UMSt, which offset voltage depends on the clutch position and the operating direction of the clutch.

6. A device for the reduction of clutch-grabbing oscillations in a motor vehicle drive train with a drive motor (2) operatively arranged to be connected via a clutch (4) with another drive train (6, 8) in a manner transmitting torque, said device comprising an electric motor actuator (27) for the operation of the clutch, at least one sensor for the acquisition of clutch-grabbing oscillations in the drive train and an electronic control device (32) that so controls the operation of the actuator that the moment, which can be transmitted by the clutch, will have a value depending on the operating conditions of the drive train, wherein the electronic control device controls the actuator according to a process for the reduction of clutch-grabbing oscillations in said motor vehicle drive with said drive train that can be connected by said clutch with another drive train in a torque-transmitting manner in which process the moment, transmitted by the clutch, is so changed by controlling the actuator that operates an operating member of the clutch in case of the occurrence of clutch-grabbing oscillations in such a manner that the clutch-grabbing oscillations are diminished, wherein an electric voltage, determining the operation of the actuator, is modulated in accordance with the following formula: UM=UMSt*w+UMR*(1−w), wherebyw is a weighting factor that can assume values of between 0 and 1,UMSt is a modulation voltage that is controlled in a defined manner by an actuator model and a required travel modulation, and,UMR is a modulation voltage regulated by a control device, which voltage is a magnitude that characterizes an operating state of the clutch on the basis of the deviation between a required value and the actual value.