Determination of steering angle for a motor vehicle
First Claim
1. A method in which the steering angle of a motor vehicle is determined, comprising:
- calculating, by a vehicle model based on a yaw rate of the vehicle, a plurality of theoretical steering angles in a data record,determining, with a steering angle sensor, a plurality of measured steering angles in the data record,determining a plurality of difference values between the plurality of measured steering angles and the plurality of theoretical steering angles in the data record,determining, a correlation coefficient between the plurality of measured steering angles and the plurality of theoretical steering angles,in response to the correlation coefficient exceeding a correlation threshold;
determining a correction constant for correcting the measured steering angles in the data record, the correction constant being based on a mean value of the plurality of difference values,calculating, based on at least one of a variation of the plurality of measured steering angles in the data record and a comparison between the correction constant in the data record and another correction constant in another data record, a confidence level of the correction constant, which changes incrementally between successive data records,in response to the confidence level exceeding a confidence threshold that indicates that both the variation of the plurality of measured steering angles in the data record and the comparison between the correction constant in the data record and the other correction constant in the other data record are less than respective thresholds, storing the correction constant for use by a control system of the motor vehicle, andin response to the correlation coefficient not exceeding the correlation threshold or the confidence level not exceeding the confidence threshold, determining a new data record.
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Abstract
Method and control device for determining a steering angle of a motor vehicle, wherein a theoretical steering angle is calculated by a vehicle model and a measured steering angle is determined with a steering angle sensor, and the difference between the measured and theoretical steering angles is determined, wherein at least one data record including a number of successive measured values is acquired, and a correction constant for the measured steering angle is determined from the mean value of the differences between the theoretical steering angle and the measured steering angle. According to the invention, a confidence level, which changes incrementally between successive data records, is calculated by travel conditions present during the acquisition of the data record and/or an analysis of the data record.
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Citations
12 Claims
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1. A method in which the steering angle of a motor vehicle is determined, comprising:
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calculating, by a vehicle model based on a yaw rate of the vehicle, a plurality of theoretical steering angles in a data record, determining, with a steering angle sensor, a plurality of measured steering angles in the data record, determining a plurality of difference values between the plurality of measured steering angles and the plurality of theoretical steering angles in the data record, determining, a correlation coefficient between the plurality of measured steering angles and the plurality of theoretical steering angles, in response to the correlation coefficient exceeding a correlation threshold; determining a correction constant for correcting the measured steering angles in the data record, the correction constant being based on a mean value of the plurality of difference values, calculating, based on at least one of a variation of the plurality of measured steering angles in the data record and a comparison between the correction constant in the data record and another correction constant in another data record, a confidence level of the correction constant, which changes incrementally between successive data records, in response to the confidence level exceeding a confidence threshold that indicates that both the variation of the plurality of measured steering angles in the data record and the comparison between the correction constant in the data record and the other correction constant in the other data record are less than respective thresholds, storing the correction constant for use by a control system of the motor vehicle, and in response to the correlation coefficient not exceeding the correlation threshold or the confidence level not exceeding the confidence threshold, determining a new data record. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification