Precise ascertainment of actuating position for a motor-driven vehicle part

摘要

A method is specified for ascertaining an actuating position of a vehicle part that can be moved by an electric actuating motor. The speed of an actuating motor correlated therewith is acquired in a time-resolved manner during an actuation process. An initial no-load phase of the actuation process is identified, during which the actuating motor rotates while overcoming the system tolerance of the actuating mechanism without motion of the vehicle part. An actuating position measure for the actuating position of the vehicle part is ascertained from the motor rotation, with this measure being corrected during the no-load phase. By averaging over time, a test quantity is ascertained from the second derivative or the measured quantity correlating herewith. The end of the initial no-load phase is identified in this process when the test quantity exceeds a predetermined limit.

主权项

1. A method for ascertaining the actuating position of a vehicle part of a vehicle that is moveable via an electric actuating motor via an actuating mechanism, the method comprising:
acquiring a speed of an actuating motor or a motor signal correlated therewith in a time-resolved manner during an actuation process; identifying an initial no-load phase of the actuation process through analysis of a curve of the speed or motor signal, during which the actuating motor rotates while overcoming a system tolerance of the actuating mechanism without motion of the vehicle part; ascertaining an actuating position measure for the actuating position of the vehicle part during the actuation process from the motor rotation, with this measure being corrected for the unloaded angle of rotation of the actuating motor during the no-load phase; determining a second derivative of the speed or of the motor signal or a measured quantity correlating herewith; ascertaining a test quantity by averaging over time of the second derivative or the measured quantity correlating herewith; and identifying an end of the initial no-load phase when the test quantity exceeds a predetermined limit.