Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
2001-11-27
2004-02-24
Lewis, Tisha D (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
C477S097000, C477S174000, C701S063000, C074S335000
Reexamination Certificate
active
06695747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a transmission system with a shift mechanism for controlling the transmission system, a control device for controlling a transmission system with a shift mechanism, a method for controlling such a transmission system or shift mechanism, as well as an application for the transmission system.
2. Description of the Related Art
In order to shift various gears in a transmission system, particularly an automated shift transmission, shift mechanisms are used. The shift mechanisms include a shift motor and a selection motor, wherein the motors control a selector finger, which is moved in an arrangement including a selection passageway and various shift passageways. The shift passageways are thereby allocated to predetermined gears, so that within a shift passageway there exists one position in which a predetermined gear of the transmission is fully engaged. Through an appropriate mechanism with shift forks, the movement of the selector finger is transmitted to gearshift rings. A selector shaft that is coupled with the selector finger is controlled by the motors in such a way that it can execute swiveling movements around its axis as well as axial movements. The swiveling or linear movements are changed into shift movements or movements of the gearshift rings.
Those movements, or especially the movements of the motors, are tracked by displacement and/or angle sensors. They are designed specifically as incremental displacement sensors, hence as sensor devices that detect a position by adding up individual increments along a linear section or an angle.
Such shift mechanisms have proven useful, particularly for controlling automated shift transmissions. The use of incremental displacement detection devices has frequently led to cost savings compared with the use of absolute displacement detection devices.
Nevertheless, it would be desirable to further improve those known transmission systems having shift mechanisms, particularly with regard to their reliability and shifting accuracy.
Particularly when incremental displacement detection devices are used, there is a risk of incorrect shifts, which, apart from a loss of comfort, can cause delayed shift procedures or damage to the transmission or the shift mechanism.
It is therefore desirable to be able to accurately determine or check the current position of the selector finger or to be able to perform a position alignment or position adjustment, even when information from a position-sensing device is lost or inaccurate. Furthermore, it would be desirable for position errors encountered during the detecting or controlling of the selector finger to be detected as quickly and as safely as possible, and substitute measures introduced for their elimination.
A secure adaptation of predetermined positions, such as particularly the gear end positions, at a predetermined point in time would also be desirable.
The invention is therefore based on the object of producing an improved transmission system with a shift mechanism, and a method for controlling the same, along with a control device for controlling the actuation device of the same, which will reduce the probability of incorrect shifts, transmission damage, functional impairment, and failure, and through which the possibility of improved driving comfort is produced.
SUMMARY OF THE INVENTION
In accordance with the invention, a transmission system with a shift mechanism for its actuation is proposed, whereby the shift mechanism has an arrangement for automatically determining at least one predetermined parameter, from which, starting from an unknown selector finger position, that is, especially an unknown position within the selection-shift-passageway device, the parameter can be determined.
It should be noted that in all embodiments in this application the transmission system is preferably formed as an automated transmission (ASG) of a motor vehicle. It should further be noted that the embodiments of the invention are explained particularly in reference to a shift mechanism designed to actuate a transmission system, however that should not represent a limitation of the invention of the shift mechanism. The invention also extends particularly to a transmission system having features in accordance with the invention.
The shift mechanism has a selection-shift-passageway layout. Within the framework of this application, a selection-shift-passageway layout should be particularly understood as an arrangement of at least one selection passageway and at least one shift passageway. In this selection-shift-passageway layout or in this shift diagram a first shift element, which is specifically a selector finger, is movable. It should further be noted that within the framework of this application a shift passageway should be understood particularly as a passageway that is arranged in a certain position in the selection direction. In particular, passageway portions that extend on different sides of the selection passageway and are arranged in a specific position in the selection direction are designated as a shift passageway. In particular, those different passageways are also designated as a shift passageway.
It should be noted that the term “selector finger,” to which reference is made within the framework of this disclosure, should be understood in a broad sense. In the sense of the claims, the term selector finger should for that reason be understood generally as a shift element.
The selector finger is controlled by an actuation device, which especially has a selection motor and a shift motor. The selector finger is controllable by the selection motor in the selection direction, that is, in the direction that is determined by the longitudinal direction of the selection passageway. Correspondingly, the selector finger is controllable by the shift motor in the shift direction, that is, in the direction that is determined by the longitudinal direction of the shift passageway.
An actuation device in the sense of this application is especially to be understood to be a device that has at least one motor, especially an electric motor. In particular, the actuation device has a selection motor and a shift motor, whereby those motors control particularly a movement of the selector finger and/or a selector shaft in different directions.
A position sensor detects the selector finger movement or the selector shaft movement or the motor movement, that is, especially the movement of a selection motor and a shift motor.
It should be noted that the term position sensor or passageway measuring device should be understood within the framework of this invention in a broad sense, and includes especially a device for detecting a passageway length and a device for detecting a (traversed) angle and/or a position. Furthermore, this term extends both to an absolute position sensor as well as to an incremental position sensor. The position sensor is preferably formed as an incremental angle sensor, whereby in a particularly preferred embodiment an angle sensor mechanism is arranged on or in the selection motor or in its vicinity, and on or in the shift motor or in its vicinity, respectively. It is also preferred that a selection motor controls an axial movement of a selector shaft, and a shift motor controls a rotational or swiveling movement of the selector shaft, whereby an incremental angle sensor detects the swiveling movement and a passageway sensor for detecting a longitudinal movement of the translatory movement.
A passageway sensor, within the framework of this application, should be understood particularly as a sensor that detects an angular or swiveling movement, or a sensor that detects a translatory motion, or a sensor that detects a displacement distance. The passageway sensor is designed especially as an incremental passageway sensor.
The shift mechanism preferably has a second shift element, that is preferably formed as a selector shaft. It should be noted that for the purpose of simplifying the explanation of the invention, reference is
Berger Reinhard
Eckert Martin
Henneberger Klaus
Hirt Gunter
Jäger Thomas
Lewis Tisha D
LuK Lamellen und Kupplungsbau Beteiligungs KG
Mangels Alfred J.
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