Patent ID: 6785599
Filing Date: 2004-08-31
Classification: F16H,Y10S,Y10T

Abstract:
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.