Method for adapting a torque converter lock-up clutch

Details Method for adapting a torque converter lock-up clutch Method for adapting a torque converter lock-up clutch

2000-03-22

2001-12-25

Marmor, Charles A (Department: 3681)

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

C192S003280

Reexamination Certificate

active

06332517

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a method for adapting a torque converter lock-up clutch in an automatic transmission where an electronic gear control outputs an application pressure upon detecting the need of a change of state of the torque converter lock-up clutch. From revertive variables, the electronic gear control detects a change of state of the torque converter lock-up clutch during a control/regulating phase. The electronic gear control then determines therefrom an adaptation value for the application pressure.
In torque converter lock-up clutches, the problem arises in the practice that the application behavior thereof clearly depends on the mechanical axial play of the system, the so-called release play. A different release play causes a different operating comfort during state changes of the torque converter lock-up clutch, such as from open to regulated or from open to closed. DE-OS 41 11 081 proposes as solution for this that during a controlled/regulated transition from open to closed the application pressure be tested by measuring the change of the slip within a preset period of time. The application pressure is then adequately adapted according to the time period measured.
Based on the above described prior art, the problem to be solved by the invention is further to develop the prior art.
SUMMARY OF THE INVENTION
According to the invention, the problem is solved in that after output of the application pressure an application phase for the torque converter lock-up clutch follows wherein, during the application phase, the electronic gear control outputs, within a first interval, a pressure change after a transition function and tests the existence of the reaction of the torque converter lock-up clutch. In the absence of reaction, the electronic gear control then outputs further intervals. The application phase ends when a reaction of the torque converter lock-up clutch occurs, the electronic gear control then continuing with the control/regulating phase. According to claim
2
, the reaction of the torque converter lock-up clutch may be detected when a differential rotational speed calculated from pump and turbine rotational speeds falls below a limit value. The inventive solution offers the advantage of it being possible to enlarge the tolerances within the limits of which must lie the produced hydrodynamic torque converters, including the torque converter lock-up clutch. This results in a corresponding lowering of cost.
In a development of the invention, it is proposed that the new application pressure be calculated by weighting, with a factor, the pressure value existing during occurrence of the reaction of the torque converter lock-up clutch.
In one other development of the invention, it is proposed that as an additional safety function the intervals output during the application phase is added up and an error is entered in a diagnosis system when the addition exceeds a limit value. As consequent reaction, it is then possible, as proposed in claim
5
, to activate a substitute program by means of which the preset state changes of the torque converter lock-up clutch, e.g. the regulated operation, is no longer permitted.
In another development, it is proposed that with the beginning of the method for adapting the torque converter lock-up clutch, a time step is started and a renewed method for adaptation be applied only when the time step exceeds a limit value. Therefore, it is hereby taken into consideration that the changes of the torque converter lock-up clutch, such as friction value change, occur slowly. It is thus enough, when the adaptation method is operated with long periods of time. Thus, there results altogether the advantage of a quicker program sequence.


REFERENCES:
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patent: 4660697 (1987-04-01), Yoneda et al.
patent: 4989471 (1991-02-01), Bulgrien
patent: 5160002 (1992-11-01), Suzuki
patent: 5332073 (1994-07-01), Iizuka
patent: 5737979 (1998-04-01), McKenzie et al.
patent: 41 11 081 A1 (1991-10-01), None
patent: 195 13 694 C1 (1996-10-01), None
Hein, Dr. Ing. L., Dipl. Ing. H. Nauerz and Dipl. Ing. O. Wörner, “Aufbau und Steuerung einer schlupfgeregelten Überbrückungskupplung im hydrodynamischen Drehmomentwandler” in VDI Berichte Nr. 1175, 1995, pp. 319-337.

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