Method of and apparatus for actuating the torque transmitting sy

192 clutches and power-stop control – Transmission control and clutch control – Common control

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Details

192 33, 74335, B60K 4122, F16D 3300, F16H 5900

Patent

active

061163910

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a motor vehicle with an engine, a transmission and torque transmitting system which is disposed in the path of torque transmission between the engine and the transmission, with an actuating unit for the initiation of the clutching operation and of the shifting and selecting operation for the carrying out of an automated change of gear.
The carrying out of a change of gear in motor vehicles is performed in part manually by the driver, and such change of gear is carried out by hand by means of an actuating lever, such as a shifting lever.
There also exist automatic transmissions which, in comparison with a shift transmission, such as a range transmission, are of a more complicated and more expensive design entailing a considerable increase in the cost of the transmission. Such automatic transmissions can carry out an automatic change of gear in response to hydraulic actuation of brakes and clutches.


OBJECTS OF THE INVENTION

The object underlying the invention is to provide an automated shift transmission which carries out a gear change in a range transmission in response to a command from the driver or in a fully automatic way. Another object underlying the invention is to render it possible to put to use those transmissions which are employed as manually actuated shift transmissions to operate as automated shift transmissions, preferably with only minor changes or without changes.
Another object is to provide an actuator for the carrying out of the shifting, selecting and clutching operations which actuator permits a convenient change of gears but is nevertheless optimized as far as the number of its parts is concerned and can be produced at a reasonable cost.
A further object is to provide an integrated actuator which essentially encompasses the required adjusting means and sensors.


SUMMARY OF THE INVENTION

In accordance with the invention, this is accomplished in that an actuating unit is supplied with a pressurized medium by a hydraulic unit having a hydraulic pump and, if necessary, an accumulator, to effect a planned initiation of a gear shifting operation. The actor unit comprises at least one adjusting member, and the hydraulic unit comprises valves and connections for hydraulic fluid which are actuated to effect a controlled initiation of the shifting and selecting operation. The hydraulic connections are provided primarily between the valves, respectively between the valves and the adjusting members.
In accordance with the invention, this can also be accomplished in that the actuating and hydraulic unit comprise a first section wherein a proportional valve selects a fluid pressure for shifting by means of an adjusting member and at least one valve which is installed downstream of the proportional valve selects the direction of shifting, and a second section wherein a proportional valve selects a fluid pressure for the actuation of the torque transmitting system by means of an adjusting member and, if necessary, for the selection by means of an adjusting member, at least one valve which is installed downstream of the proportional valve being utilized to initiate the selection.
It can be of advantage if the actuating unit and the hydraulic unit form a structural entity; however, the hydraulic pump and/or the accumulator need not necessarily belong to such structural entity but can be mounted separately.
It can also be of advantage if the actuating unit and the hydraulic unit are mounted separately and are connected to each other by fluid conduits. Thus, a valve block can be installed separately of an actuating block with adjusting members. Still further, it can be of advantage if the adjusting member for the actuation of the clutch is not installed in the actuating unit. The sensorics can be received in or mounted on the actuating unit or in a hydraulic unit or at the adjusting members. The member for the actuation of the clutch can be directly connected with the valve block. Furthermore, a piston which is interposed for example for liquid s

REFERENCES:
patent: 4766774 (1988-08-01), Tamai
patent: 5029678 (1991-07-01), Koshizawa
patent: 5040653 (1991-08-01), Vukovich et al.
patent: 5674155 (1997-10-01), Otto et al.
patent: 5726889 (1998-03-01), Shinojima
patent: 5836207 (1998-11-01), Spooner et al.
patent: 5893292 (1999-04-01), Lanting
patent: 5992590 (1999-11-01), Harries

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