Tyre pressure determination
First Claim
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1. A method of analysing data produced by a piezo electric device located on a roadway traversed by automotive vehicles, comprising:
- a) locating a piezo electric detector for engagement with a tire of an automotive vehicle;
b) causing said vehicle to pass over said detector and to generate a signal;
c) analysing said signal to determine information relating to said vehicle;
characterised by;
d) said step of analysing said signal to determine information to said vehicle comprising analysing the waveform of said signal to eliminate or reduce the effect of vehicle weight on said waveform.
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Abstract
A method and apparatus for determining tire pressure in automotive vehicles utilices twin spaced parallel and non-transverse piezoelectric cables which are traversed by a vehicle to produce a voltage pulse having a shapes or profiles characteristic of the tire pressure. Waveform analysis on the basis of a software algorithm and/or look-up calibration data enables numerical pressure determination. The system is well adapted for remote automotive vehicle tire pressure sensing under normal conditions of vehicle use.
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Citations
17 Claims
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1. A method of analysing data produced by a piezo electric device located on a roadway traversed by automotive vehicles, comprising:
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a) locating a piezo electric detector for engagement with a tire of an automotive vehicle;
b) causing said vehicle to pass over said detector and to generate a signal;
c) analysing said signal to determine information relating to said vehicle;
characterised by;
d) said step of analysing said signal to determine information to said vehicle comprising analysing the waveform of said signal to eliminate or reduce the effect of vehicle weight on said waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for analysing data produced by a piezo electric detector located in a roadway traversed by automotive vehicles the apparatus comprising;
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a) a mounting for a piezo electric detector adapted to mount same for engagement by tires of automotive vehicles, so that said tires can pass over said detector to generate a signal;
b) signal analysis means to determine information relating to said vehicle;
characterised by;
c) said analysis means being adapted to analyse the waveform of said signal to reduce or eliminate the effect of vehicle weight on said waveform. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification