Securing the assistance torque by means of an estimator of the force on the rack
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United States of America Patent
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Mar 4, 2014
Grant Date -
Jun 13, 2013
app pub date -
Jul 13, 2011
filing date -
Aug 20, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for securing the assistance torque (15) supplied by an electric assistance motor (8) in a motor vehicle power steering system includes the steps of: estimating the force on the steering system rack from the torque exerted by the driver on the steering wheel (2), from the assistance torque (15), and optionally from other parameters such as the speed of the electric assistance motor; comparing a target assistance torque with an authorized assistance range, defined with respect to the estimated rack force (17) at any moment, and in the event the target assistance torque is maintained above predefined limits for a predefined duration, correcting and optionally interrupting the power steering.
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