Method for detecting wheel imbalances in a vehicle
First Claim
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1. A method comprising:
- ascertaining a driving state variable by a sensor over a speed range of a vehicle;
performing a frequency analysis of the driving state variable, thereby obtaining for each of a plurality of speeds of the speed range a respective one of a plurality of frequency values;
analyzing the plurality of frequency values to identify a step-up in the plurality of frequency values within the speed range;
comparing a peak one of the frequency values of the identified step-up to a single threshold value applied to the plurality of speeds of the speed range; and
determining whether there is a wheel imbalance of a wheel of the vehicle based on a result of the comparison.
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Abstract
In a method for detecting wheel imbalances in a vehicle, the profile of the driving state variable is ascertained by sensor over a speed range of the vehicle; a frequency analysis is performed; and a resonance step-up is indicative of a wheel imbalance.
5 Citations
14 Claims
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1. A method comprising:
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ascertaining a driving state variable by a sensor over a speed range of a vehicle; performing a frequency analysis of the driving state variable, thereby obtaining for each of a plurality of speeds of the speed range a respective one of a plurality of frequency values; analyzing the plurality of frequency values to identify a step-up in the plurality of frequency values within the speed range; comparing a peak one of the frequency values of the identified step-up to a single threshold value applied to the plurality of speeds of the speed range; and determining whether there is a wheel imbalance of a wheel of the vehicle based on a result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14)
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9. A control unit, comprising:
a control device configured to perform the following; ascertain, based on output of a sensor, a driving state variable over a speed range of a vehicle; perform a frequency analysis of the driving state variable, thereby obtaining for each of a plurality of speeds of the speed range a respective one of a plurality of frequency values; analyze the plurality of frequency values to identify a step-up in the plurality of frequency values within the speed range; compare a peak one of the frequency values of the identified step-up to a single threshold value applied to the plurality of speeds of the speed range; and determine whether there is a wheel imbalance of a wheel of the vehicle based on a result of the comparison.
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10. A vehicle, comprising:
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at least one wheel-speed sensor; and a control device configured to perform the following; ascertain, based on output of the at least one sensor, a driving state variable over a speed range of a vehicle; perform a frequency analysis of the driving state variable, thereby obtaining for each of a plurality of speeds of the speed range a respective one of a plurality of frequency values; analyze the plurality of frequency values to identify a step-up in the plurality of frequency values within the speed range; compare a peak one of the frequency values of the identified step-up to a single threshold value applied to the plurality of speeds of the speed range; and determine whether there is a wheel imbalance of a wheel of the vehicle based on a result of the comparison.
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Specification