Patent ID: 9507444
Filing Date: 2016-11-29
CPC Classification: G01D,G06F

Claim Text:
1. A method for operating an operator control device for a motor vehicle, the operator control device having a rotary actuator which is rotatably mounted on a holding element, and a coding element, the method comprising: detecting first and second actual sensor values by sensing a coding of the coding element in a current rotational position of the rotary actuator; providing first and second setpoint sensor values at each of a plurality of predetermined rotational angles between the rotary actuator and the holding element; assigning the first and second actual sensor values respectively to the first and second setpoint sensor values at one of the predetermined rotational angles; adapting the first and second actual sensor values respectively to the first and second setpoint sensor values to respectively produce adapted first and second actual sensor values; and determining a current rotational angle between the rotary actuator and the holding element based on the adapted first and second actual sensor values, wherein the first and second actual sensor values correspond to a first plot of x and y values, the first and second setpoint sensor values correspond to a second plot of x and y values, the first actual sensor value and the second actual sensor value are adapted in a rough calibration, for the rough calibration, the current rotational position of the rotary actuator is set so that the first actual sensor value and the second actual sensor value are substantially the same, for the rough calibration, a factor is determined to increase or decrease the first and second actual sensor values, the factor corresponding to the distance between the first and second plots, the first and second actual sensor values are adapted by multiplying each of the first and second actual sensor values by the factor, for a factor calibration of the first actual sensor value, the operator control device is in a rotational position in which the first actual sensor value is at a maximum, the factor for the first actual sensor value is calibrated to close a distance between the first actual sensor value and the first setpoint sensor value assigned thereto, for a factor calibration of the second actual sensor value, the operator control device is in a rotational position in which the second actual sensor value is at a maximum, the factor for the second actual sensor value is calibrated to close a distance between the second actual sensor value and the second setpoint sensor value assigned thereto, for adaptation, an offset is added to the first and second actual sensor values, the offset for the first actual sensor value is determined when the operator control device is in a rotational position in which the first actual sensor value is at a minimum, and the offset for the second actual sensor value is determined when the operator control device is in a rotational position in which the second actual sensor value is at a minimum.