Device for controlling an automatic motor-vehicle clutch

Details Device for controlling an automatic motor-vehicle clutch Device for controlling an automatic motor-vehicle clutch

1989-09-21

1991-01-22

Diehl, Dwight

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 76, F16D 4322

Patent

active

049864017

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application of PCT/EP88/00219 field 18 Mar. 1988 and based upon a German Application P 37 10 015.7 filed Mar. 26, 1987.


FIELD OF THE INVENTION

This invention relates to a device for controlling an automatic motor-vehicle clutch arranged between a driving engine and a transmission and operating primarily as a starting clutch, an engine torque and rotational speeds are detected before and after the clutch, the speeds are measured by a control device transforming an electric signal coming therefrom into a control valve for a regulating device opening the clutch so that the clutch is actuated for starting and shifting and actuates torsional vibrations in drive train.


BACKGROUND OF THE INVENTION

From the not yet published PCT/EP86/00544, a device for controlling an automatic motor-vehicle clutch is known. With this device, an initial engagement speed which is well adjusted to the starting resistance becomes rapidly effective and it is possible to achieve not only a rapid but also a qualitatively good starting process by means of correction factors and influencing mechanisms.
In order to achieve the most economic fuel-consumption values, modern automatic transmissions have drive cycles with relatively low shift points, so that, in the case of a low engine rotation, vibrations can occur. While in an automatic transmission preceded by a hydrodynamic torque converter these vibrations cannot be passed, they are easily transmitted to the transmission in an automatic clutch-transmission combination, in spite of mechanically-acting dampers provided in such clutches against torsional vibrations.
As is known from FR-A 2 559 106 a device for the automatic adjustment of clutch attenuates torsional vibrations in the drive train through controlled changes in the clutch torque. However, the detection of these vibrations and defining the correction factors are complicated and expensive, requiring, besides considerable computing efforts and thus time consumption, as well as the consideration of characteristic values which have to be first determined and then fed into the memory. These characteristic values, for instance, the torsional rigidity in the respective gear, can vary between the respective drive trains, so that, in addition to the high cost, the read conditions in the drive train are not even fully considered. From JP-A-60/19 18 28, a device with a manually actuated clutch is known. Vibrations occurring in the drive train after the transmission are measured via a tacho-generator and are eliminated over a half-opened clutch. The clutch actuation for the half-opening takes place hereby via a control mechanism with a soleniud valve, which is superimposed on the manually driven actuation cylinder serving for the clutch actuation in order to eliminate the vibrations. Such a clutch-influencing mechanism can no longer be used in a modern drive train.
Further, from a control of a clutch travel according to German Open Application 3 531 434, it is known to adjust a clutch in such a way that a sliding torque transmittal by the clutch is equal or only slightly bigger than the torque transmitted after engine side. However this adjustment takes place in connection with rotation-speed differences before and after the clutch as a result of excessive loads.


OBJECTS OF THE INVENTION

It is therefore the object of the invention to develop a device for controlling a clutch travel of an automatic motor-vehicle clutch which eliminates and prevents unacceptable vibrations in the drive train including an engine. Yet another object is to develop a method for controlling the clutch travel in order to prevent unacceptable vibration of the drive train.


SUMMARY OF THE INVENTION

In accordance with the invention the device for controlling an automatic motor vehicle clutch is arranged between a driving engine and a transmission, an engine torque and a transmission torque are detected by a control device transferring an electrical signal coming from an electronic

REFERENCES:
patent: 4457411 (1984-07-01), Hiramatsu
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4677787 (1987-05-01), Hofmann
patent: 4785917 (1988-11-01), Tateno et al.
patent: 4854433 (1989-08-01), Tellert

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