192 clutches and power-stop control – Clutches – Torque responsive
Reexamination Certificate
2000-05-02
2002-05-14
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Torque responsive
C477S086000
Reexamination Certificate
active
06386351
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method of controlling a torque transmission system, to a torque transmission system for carrying out the method of controlling, and to a method of monitoring torque transmission systems.
It is known from the vehicle industry that, when changing the transmission ratio of a gear between a driving machine and a gearbox unit, the required clutching processes can be assisted or automated by a control or regulating algorithm. This facilitates the servicing of the engine unit or gearbox, and the clutching operation can be carried out in an energy saving manner with careful treatment of the materials. Furthermore, the control of a torque transmission system which is mounted at the output side of an automatic gearbox can be helpful, for example, in undertaking or guaranteeing adjustment processes and protective functions in the case of, for example, cone pulley belt contact gearboxes.
WO 94/04852 discloses a method of controlling torque transmission systems in conjunction with an automatic gearbox. The torque transmission system comprises a load branching out with a torque converter which is mounted in parallel with a friction clutch.
In accordance with this method, a driving torque transmitted by an engine unit is broken up into a hydraulic part which is to be transmitted by the converter and a mechanical part which is to be transmitted by the friction clutch, such as a lockup clutch. A central computer unit determines or calculates, in dependency upon the relevant operating condition of the system, the torque which is to be transmitted each time by the friction clutch. The remaining torque to be transmitted by the hydraulic torque converter constitutes the difference between the applied torque and the torque transmitted by the friction clutch and corresponds directly to a slip between the input and output parts of the torque transmission system.
Such method of controlling can be resorted to only in conjunction with an automatic gearbox and a lockup clutch. However, the acceptability of automatic gearboxes is only minimal in many fields of use. Furthermore, a lockup clutch of such kind is cost-intensive and bulky.
OBJECTS OF THE INVENTION
An object of the invention is to provide a method of controlling which can be used practically universally, the regulating quality of which is high, and which exhibits a clearly improved load change behavior for torque transmission systems.
In addition, one should achieve cost advantages in comparison with conventional torque transmission systems. Furthermore, an object is to provide a torque transmission system which can be utilized for the practice of such controlling method.
SUMMARY OF THE INVENTION
The above objects are accomplished in that the clutch torque which can be transmitted from an input side to an output side of a torque transmission system with or without load distribution or branching out is utilized as a control value and such control value is calculated and/or determined in dependency upon an input or driving torque.
This amounts to a realization of a torque matching concept. The basic concept underlying the method of such kind resides in controlling the setting member primarily in such a way that the clutch torque which can be transmitted by the torque transmitting parts is mainly just above or just below the driving torque at the input side or drive side of the torque transmission system.
As a rule, a torque transmission system must be designed for the transmission of two to three times the maximum driving torque of a driving machine, such as an engine. However, the driving torque which is typical of the operation is but a fraction of the maximum driving torque. The torque matching renders it possible to establish only that force-locking engagement which is required between the torque transmitting parts in lieu of a quasi permanent excessive overpressure.
A further advantage resides in the provision of a controlling method. In contrast to a regulation, the feedback of condition values of the torque transmission system is not absolutely necessary. It serves merely for a possible enhancement of the control but is not required in order to establish the operation of the torque transmission system. The task of a torque transmission system of such kind is to transmit torque. Therefore, it is expedient to use the transmittable clutch torque as a control value.
An advantageous embodiment of the invention is characterized in that, in a method of controlling a torque transmission system with or without load distribution or branching out which controls the torque adapted to be transmitted from an input side to an output side of the torque transmission system, the latter comprises a sensor system for detecting the values to be measured and a central control or computer unit which is connected with the sensor system, the torque which can be transmitted by the torque transmitting system being controlled in such a way that the transmittable torque is calculated, adapted and controlled as a function of a driving torque, and deviations from an ideal state are compensated for long-term through corrections.
Furthermore, it can be of advantage to resort to a method which serves to control a torque transmission system, especially for motor vehicles, wherein the torque transmission system is installed in the power flow downstream of a driving machine and in the power flow upstream or downstream of a shiftable device, such as a gearbox, and controls the torque which can be transmitted from an input side to an output side of the torque transmission system, and the power transmission system includes a control or computer unit which is in signal connection with sensors and/or other electronic units, the torque which can be transmitted by the torque transmitting system being calculated as a function of a driving torque and being adaptively controlled, with deviations from an ideal condition compensated for long-term through corrections.
According to another embodiment, the control value can be triggered by means of a setting member supplied with a setting value which is functionally dependent upon the transmittable clutch torque, in such a way that the transmittable clutch torque lies within a predetermined tolerance range at a slip limit wherein this slip limit is reached when the effect of a torque being applied at the input side exceeds the clutch torque which can be transmitted by the torque transmitting parts.
The method according to such embodiment can be carried out particularly in such a way that the torque which can be transmitted by a torque transmission system, such as a friction clutch and/or a hydrodynamic torque converter with or without converter lockup clutch and/or a starter clutch for automatic gearboxes and/or a turning set clutch and/or a torque transfer system connected in front of or behind an infinitely adjustable gearbox, such as a cone pulley belt contact gearbox, can be controlled as a function of a driving torque so that in the case of systems with load distribution or load branching, such as a hydrodynamic torque converter with converter lockup clutch, the torque which can be transmitted by the clutch is determined in accordance with the torque equation
M
KSoll
=K
ME
*M
AN
and
M
Hydro
=(1−
K
ME
)*
M
AN
wherein the two equations apply for K
ME
≦1 and
M
KSoll
=K
ME
*M
AN
and
M
Hydro
=0
applies for K
ME
>1 with
K
ME
=torque division factor
M
KSoll
=desired clutch torque
M
AN
=applied torque
M
Hydro
=torque transmittable by the hydrodynamic torque converter
and a torque difference between the torque M
AN
applied to the torque transmission system by the driving aggregate and the torque M
KSoll
transmittable by the clutch is transmitted through the hydrodynamic torque converter wherein a minimum slip is established independently between the engine and the output of the torque transmission system in dependency upon the torque division factor K
ME
and deviations from the ideal condition are adoptively detected, p
Müller Bruno
Rauser Martin
Reuschel Michael
Salecker Michael
Wagner Alfons
Bonck Rodney H.
Darby & Darby
LuK Getriebe-Systeme GmbH
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