Method of operating a vehicle transmission
AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG
InventorsReinhard Berger, Martin Vornehm, Stefan Winkelmann, Marc Hauptmann, Klaus Henneberger, Klaus Kupper
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Abstract
Specific shift positions of an electrically actuated vehicle transmission, such as first to fifth, neutral and reverse gears, are detected by monitoring one or more characteristic electrical variables, e.g., actuator currents, during a shift movement of the transmission and by correlating increased or decreased levels of current with the arrival at or passage through the specific shift positions.
Claims28
A method of detecting a change in position relative to a reference point of a transmission that is shiftable into a plurality of shift positions corresponding to different rotary transfer ratios between an input shaft and an output shaft, wherein
- changes from one shift position to another are associated with movements of a first shifter element in a two-dimensional shift pattern comprising a selector track and shift tracks,
- a first electrical actuator actuates movements along the selector track, and a second electrical actuator actuates movements along the shift tracks,
- at least one of the actuators comprises a displacement-sensor device, and
- the transmission comprises an electrical control device to control the actuators;
- the method comprising the step of emulating at least one of the actuators by means of a model in the electrical control device.
A method of detecting a change in position relative to a reference point of a transmission that is shiftable into a plurality of shift positions corresponding to different rotary transfer ratios between an input shaft and an output shaft, wherein
- changes from one shift position to another are associated with movements of a first shifter element in a two-dimensional shift pattern comprising a selector track and shift tracks,
- a first electrical actuator performs movements along the selector track, and a second electrical actuator performs movements along the shift tracks, and the transmission comprises an electrical control device to control the actuators;
- the method comprising the step of emulating at least one of the actuators by means of a model in the electrical control device.
A control device for a vehicle transmission, said transmission comprising:
- a shift pattern with a selector track and shift tracks;
- a first shifter element, movable in the shift pattern;
- a second shifter element;
- at least one electrically controlled actuator device for actuating at least one of said shifter elements;
- a position-sensor device for detecting a current position of at least one of said shifter elements;
- wherein the control device comprises an emulator model of the at least one actuator device.
A control device for a vehicle transmission, said transmission comprising:
- a shift pattern with a selector track and shift tracks;
- a first shifter element, movable in the shift pattern;
- a second shifter element;
- at least one electrically controlled actuator device for actuating at least one of said shifter elements;
- wherein the control device comprises an emulator model of the at least one actuator device.
A vehicle transmission that has a plurality of different operating states corresponding to different rotary transfer ratios between an input shaft and an output shaft, said transmission comprising
- a shift pattern with a selector track extending in a selector-track direction and shift tracks extending in a shift-track direction;
- a first shifter element, movable in the shift pattern;
- a second shifter element;
- an electrically controlled actuator device for actuating at least one of said shifter elements;
- an electric control device for controlling the actuator device;
- a movable element indicative of said shift position and a position-sensor device for detecting a current position of said movable element;
- and
- at least one redundant sensor device operable under predetermined conditions to perform redundant determination of said shift position relative to the selector-track direction.
Dependencies are inferred from the claim text.