Estimation of the road condition under a vehicle
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Jan 9, 2004
filing date -
Jan 9, 2004
priority date (Note) -
Abandoned
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Abstract
A system for estimating the ground condition under a driving vehicle, comprising: a wheel speed sensor (4) for sensing a wheel speed signal (t(n), .omega.(n)) which is indicative of the wheel speed of a vehicle's wheel driving over the ground (2,3) and a first analyser unit (8) coupled to said wheel speed sensor (4). The first analyser unit comprises a sensor imperfection estimation section (9) which is designed to estimate a sensor imperfection signal ({circumflex over (.delta.)}.sub.l) from the wheel speed signal (t(n)) which is indicative of the sensor imperfection of the wheel speed sensor (4); a signal correction section (10) which is designed to determine an imperfection-corrected sensor signal (.epsilon.(n)) from the wheel speed signal (t(n)) and the sensor imperfection signal ({circumflex over (.delta.)}.sub.l); and a ground condition estimation section (11) which is designed to estimate a first estimation value (r(n), .alpha.(n)) indicative of the ground condition from the imperfection-corrected sensor signal (.epsilon.(n)).
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