Process to determine the absolute angular position of a motor vehicle steering wheel
AssigneeLeopold Kostal GmbH & Co. KG
InventorMichael Köster
Life of this patent
Estimating the term…
Abstract
A method for determining the absolute value of a rotational angle includes imaging a continuous segment of a code track of a code carrier on a sensor array such that the sensor array generates a corresponding output signal. The code track has a light and dark transition pattern over an angular range of 360°. The sensor array output signal is subjected to a convolution operation with a reference signal in a first correlation filter to reconstruct the light and dark transition pattern of the imaged segment of the code track as a first correlation function signal. The first correlation function signal is processed to determine a code word and a predetermined angle corresponding to the code word.
Claims10
A method for determining the absolute value of a rotational angle, the method comprising:
- imaging a continuous segment of a code track of a code carrier on a sensor array such that the sensor array generates a corresponding output signal, wherein the code track has a light and dark transition pattern over an angular range of 360°;
- subjecting the sensor array output signal to a convolution operation with a reference signal in a first correlation filter to reconstruct the light and dark transition pattern of the imaged segment of the code track as a first correlation function signal, wherein the reference signal represents a segment of the light and dark transition pattern of the code track, wherein extrema of the first correlation function signal are indicative of the light and dark transition pattern of the imaged segment of the code track and are indicative of the position of the light and dark transition pattern of the imaged segment of the code track relative to the sensor array;
- and
- processing the first correlation function signal to determine a code word and a predetermined angle corresponding to the code word.
A method comprising:
- imaging a continuous segment of a code track on a sensor such that the sensor generates a corresponding output signal, wherein the code track has a light and dark transition pattern over an angular range of 360°;
- subjecting the sensor output signal to a convolution operation with a reference signal in a first correlation filter to reconstruct the light and dark transition pattern of the imaged segment of the code track as a first correlation function signal, wherein the reference signal represents a segment of the light and dark transition pattern of the code track, wherein extrema of the first correlation function signal are indicative of the light and dark transition pattern of the imaged segment of the code track and the position of the light and dark transition pattern of the imaged segment of the code track relative to the sensor;
- and
- processing the first correlation function signal to determine a code word and a predetermined angle corresponding to the code word.
Dependencies are inferred from the claim text.