Determination of the absolute angular position of a steering wheel by incremental measurement and measuring the differential speed of the wheels
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United States of America Patent
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Oct 20, 2009
Grant Date -
Jul 24, 2008
app pub date -
Dec 28, 2007
filing date -
Jun 11, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The system for determining the absolute angular position .theta. of a steering wheel (1) of a motor vehicle with respect to the chassis thereof comprises a device for incrementally measuring the relative angular position .delta. of the steering wheel, a device (2) for measuring the differential velocity .DELTA.V/V of the wheels mounted on the same axle and a processing device (8) for sampling the angular positions and differential velocities at a period t. Said device comprises computing means suitable to determine at moments tn: the estimate .theta.*(t.sub.n) of an absolute angular position .theta.(t.sub.n) according to the differential velocity .DELTA.V/V, the mean difference offset(t.sub.n) between the angular positions .theta.*(t.sub.n) and .delta.(t.sub.i), wherein i is a variant ranging from 0 to n and the absolute angular position .theta.(t.sub.n) by the addition between the mean difference offset(t.sub.n) and the angular position .delta.(t.sub.n).
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