Research Papers

Torque Neutrality for Active Steering Systems

[+] Author and Article Information
Jonas Müller

 BMW Group Forschungs- und Innovationszentrum, Knorrstr. 147, 80788 Munich, Germanyjonas.mueller@bmw.de

For example, Audi: “Dynamic Steering”—2008, Lexus: “Vehicle Dynamics Management”—2005, Nissan: “4 Wheel Active Steer”—2004, Toyota: “Active Steer”—2003, Renault: “4 Control”—2006.

Appropriately, scaled versions of δW , δS , and δR when referenced to the steering rack position are named xW , xS , and xR , respectively, see Sec. 4.

Note that this kind of activation would not occur in a serial-production environment.

J. Dyn. Sys., Meas., Control 134(5), 051015 (Jul 27, 2012) (6 pages) doi:10.1115/1.4006631 History: Received October 04, 2011; Accepted April 13, 2012; Published July 26, 2012; Online July 27, 2012

This paper outlines a method for using an active steering system with two electrical actuators (one power-steering actuator and one superposition actuator) in order to manipulate the steering rack position without torque feedback to the steering wheel. To this effect, the power-steering actuator is used to implement a feed-forward control in order to compensate for the inertial effect introduced by the angle superposition. A rudimentary steering system model is used to derive the relevant transfer functions and assemble the control law for the superposition actuator. Experimental results of a research project at the BMW Group are included.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Sample active steering system overview

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Figure 2

Gearbox schematic

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Figure 3

Gearbox lever model

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Figure 4

Steering system replacement model (all displacements, rotations, and inertias referenced to steering rack position)

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Figure 5

Friction model [9]

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Figure 6

Model performance evaluation

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Figure 7

System performance



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