Electric power steering system

Details Electric power steering system Electric power steering system

2011-03-29

2011-03-29

Hurley, Kevin (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C701S042000

Reexamination Certificate

active

07913804

ABSTRACT:
In an electric power steering system for a vehicle that controls a force that urges a steering wheel toward a neutral position thereof, a control unit (21) for the system is configured such that an electric motor (9) for providing an assisting force produces a relatively large returning force when a rotational direction of a steering wheel (2) agrees with a direction of the steering torque applied to the road wheel (7), and a relatively small returning force when a rotational direction of the steering wheel disagrees from a direction of the steering torque applied to the road wheel. Thereby, the effort required for a vehicle operator to steer the vehicle is reduced and the steering feel can be thereby and otherwise improved while providing a favorable returning force that urges a steering wheel toward a neutral position.

REFERENCES:
patent: 6671597 (2003-12-01), Kada
patent: 7512468 (2009-03-01), Tamaizumi et al.
patent: 7739001 (2010-06-01), Kato et al.
patent: 1707473 (2006-10-01), None
patent: 2001-106108 (2001-04-01), None
patent: 2003-220964 (2003-08-01), None
patent: 2005-271877 (2005-10-01), None
patent: 2007-099053 (2007-04-01), None

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