Method of operating a vehicle transmission
AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG
InventorsReinhard Berger, Martin Vornehm, Stefan Winkelmann, Marc Hauptmann, Klaus Henneberger, Klaus Küpper
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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.
Claims22
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, wherein the model serves to detect a malfunction of the displacement-sensor device, wherein the model produces an emulator output signal, the at least one actuator produces an actuator output signal, and the malfunction is detected by finding a difference between said output signals.
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 alone 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, wherein the actuator emulation is performed by means of a control-loop emulator, wherein the control-loop emulator generates an emulator output signal that is equivalent to a displacement-sensor output signal, wherein the emulator output signal is used as a substitute for the displacement-sensor output signal to control the actuator that is being emulated.
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, wherein at a time when the displacement sensor device is fully functional, if a discrepancy is detected between the emulator output signal and the displacement-sensor output signal, an adjustment is made to reduce said discrepancy.
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;
- a first electrically controlled actuator device for actuating for actuating movements along the selector track, and a second electrically controlled actuator device for actuating movements along the shift tracks;
- 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 at least one of the actuator devices, wherein the model serves to detect a malfunction of the position-sensor device and the model produces an emulator output signal, the at least one actuator produces an actuator output signal, and the malfunction is detected by finding a difference between said output signals.
A control device for a vehicle transmission, said transmission is shiftable into a plurality of shift positions corresponding to different rotary transfer ratios between an input shaft and an output shaft, comprising:
- a two-dimensional shift pattern with a selector track and shift tracks;
- wherein changes from one shift position to another are associated with movements of a first shifter element in the shift pattern,
- a the first shifter element, being movable in the shift pattern;
- a second shifter element;
- a first electrical actuator actuates movements along the selector track, and a second electrical actuator actuates movements along the shift tracks, at least one the actuators comprises a displacement-sensor device, wherein the control device comprises an emulator model of at least one of the actuator devices, wherein at a time when the displacement sensor device is fully functional, if a discrepancy is detected between the emulator output signal and the displacement-sensor output signal, an adjustment is made to reduce the discrepancy.
Dependencies are inferred from the claim text.