Process for monitoring the condition of motor vehicle wheels
First Claim
1. A process for monitoring the state of a wheel of a motor vehicle, comprising the steps of:
- converting an output signal (MS) generated by a sensor (S) into an essentially rectangular pulse signal (l);
measuring a respective duration of the pulses;
determining a particular weighted average between a current duration value of a current pulse and a preceding duration value of a preceding pulse, wherein the current pulse and the preceding pulse lie a specific step size apart, wherein the specific step size is the number of consecutive pulses from the current pulse to the preceding pulse; and
determining a correction factor (ki) from each deviation between the current duration value and the particular weighted average;
wherein said step size (j) is correlated with an error order (m) of a fault and wherein the step size (j) with a periodic deviation of the mth order (m) that is to be eliminated is determined according to the formula j=1/m×
n/4 for motor vehicles.
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Abstract
A process and device for monitoring the state of a wheel of a motor vehicle in which an output signal of a sensor is converted into an essentially rectangular pulse signal. A respective duration of the pulse is measured; and an especially weighted average between the duration of a current value and a preceding value is determined, wherein a current value and a preceding value exhibit a time interval and/or lie a specific step size apart. A correction factor is determined from each deviation between the duration of a current value and a respective mean value. A step size of the correction method is matched to an error order of a fault. Preferably the step size with a periodic deviation of the mth order that is to be eliminated is determined according to the formula j=1/m×n/4; for motor vehicles in particular according to the formula j=1/m×12.
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Citations
16 Claims
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1. A process for monitoring the state of a wheel of a motor vehicle, comprising the steps of:
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converting an output signal (MS) generated by a sensor (S) into an essentially rectangular pulse signal (l);
measuring a respective duration of the pulses;
determining a particular weighted average between a current duration value of a current pulse and a preceding duration value of a preceding pulse, wherein the current pulse and the preceding pulse lie a specific step size apart, wherein the specific step size is the number of consecutive pulses from the current pulse to the preceding pulse; and
determining a correction factor (ki) from each deviation between the current duration value and the particular weighted average;
wherein said step size (j) is correlated with an error order (m) of a fault and wherein the step size (j) with a periodic deviation of the mth order (m) that is to be eliminated is determined according to the formula j=1/m×
n/4 for motor vehicles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for monitoring the state of a wheel of a motor vehicle, said device comprising
a sensor (S), providing a first output signal to a signal converter (W) which outputs a pulse signal; - and
a downstream unit (A(ε
i), v, p) receiving said pulse signal for determining and evaluating correction factors (k1), in order to measure a respective duration of the pulse signal and determining a particular weighted average between a current duration value of a current pulse and a preceding duration value of a preceding pulse to provide a specific step size and determining a connection factor (ki) from each deviation between the current duration value and the particular weighted average wherein said step size is correlated to an error order (m) of a fault wherein the step size (j) with a periodic deviation of the mth order (m) that is to be eliminated is determined according to the formula j=1/m×
n/4;
for motor vehicles. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification