METHOD FOR MEASURING THE ROTATION SPEED OF A VEHICLE WHEEL
First Claim
1. A method for measuring the rotation speed of a vehicle wheel including the steps of:
- acquiring an analogue measurement signal (Sma) generated by a magnetic tachometer and containing a useful signal the frequency of which is representative of the rotation speed of the wheel;
digitizing in real-time the analogue measurement signal (Sma) in order to obtain a time-dependent digital measurement signal (Smnt);
calculating a Fourier transform of the time-dependent digital measurement signal (Smnt) in an observation window in order to obtain a frequency-dependent digital measurement signal (Smnf); and
carrying out a frequency analysis on the frequency-dependent digital measurement signal so as to identify by a search for peaks a useful spectral line (15;
16) and to determine the frequency of the useful spectral line in order to obtain the frequency of the useful signal and therefore the rotation speed of the wheel.
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Abstract
A method for measuring the rotation speed of a wheel including the steps of: acquiring an analogue measurement signal (Sma) generated by a magnetic tachometer and containing a useful signal the frequency of which is representative of the rotation speed of the wheel; digitizing in real-time the analogue measurement signal (Sma) in order to obtain a time-dependent digital measurement signal (Smnt); calculating a Fourier transform of the time-dependent digital measurement signal (Smnt) in order to obtain a frequency-dependent digital measurement signal (Smnf); and carrying out a frequency analysis in order to identify by a search for peaks a useful spectral line (16) so as to obtain the frequency of the useful signal and therefore the rotation speed of the wheel.
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Citations
12 Claims
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1. A method for measuring the rotation speed of a vehicle wheel including the steps of:
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acquiring an analogue measurement signal (Sma) generated by a magnetic tachometer and containing a useful signal the frequency of which is representative of the rotation speed of the wheel; digitizing in real-time the analogue measurement signal (Sma) in order to obtain a time-dependent digital measurement signal (Smnt); calculating a Fourier transform of the time-dependent digital measurement signal (Smnt) in an observation window in order to obtain a frequency-dependent digital measurement signal (Smnf); and carrying out a frequency analysis on the frequency-dependent digital measurement signal so as to identify by a search for peaks a useful spectral line (15;
16) and to determine the frequency of the useful spectral line in order to obtain the frequency of the useful signal and therefore the rotation speed of the wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification