Electrical power assisted steering system
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United States of America Patent
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Sep 5, 2006
Issued Date -
N/A
app pub date -
Oct 7, 2004
filing date -
Apr 9, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric power assisted steering system comprising a steering mechanism which operatively connects a steering wheel to the road wheels of the vehicle, a torque sensing means (6) adapted to produce a first output signal indicative of the torque carried by a portion of the steering mechanism (7), a means (6) for producing a second output signal indicative of the angular velocity of the steering wheel, a difference means (21) for determining the difference in value of the torque carried by a portion of the column between two points in time to produce a third output value, an electric motor (1) operatively connected to the steering mechanism, a signal processing unit (7) adapted to receive the two signals and to produce a torque demand signal representative of a torque to be applied to the steering mechanism by the motor (1), and a motor drive stage adapted to provide a drive current to the motor (1) responsive to the torque demand signal, and in which the torque demand signal (1) includes a damping component that is dependent upon both the first output signal, the second output signal and the third output signal.
First Claim
Family
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Cited Art Landscape
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