Controllers for and Methods of Controlling Electric Power Assisted Steering Systems
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United States of America Patent
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Issued Date -
Jun 13, 2013
app pub date -
Jan 20, 2011
filing date -
Jan 21, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A controller for an electric power assisted steering system includes a steering mechanism and an electric motor that can apply an assistance torque to the steering mechanism. The controller has an input for an input torque signal indicative of the torque applied by a user to the steering mechanism and an output for an assistance torque demand indicative of the assistance torque to be applied to the steering mechanism by the electric motor. The controller includes: a first subcontroller having an input for the input torque signal, an output for a first assistance torque and a process arranged to determine the first assistance torque; a second subcontroller having an input for the input torque signal, an output for a second assistance torque and a processor arranged to determine the second assistance torque; and a blending unit, which provides as an output the assistance torque demand. The blending unit combines the first and second assistance torques in time-varying proportions in order to determine the assistance torque demand.
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