Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2005-06-14
2005-06-14
Hurley, Kevin (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S444000
Reexamination Certificate
active
06904999
ABSTRACT:
A target relative rotational angle Δθt which is created by a steering gear ratio change unit and which is formed by a lower steering shaft relative to an upper steering shaft is calculated on the basis of a steering angle θ, and a post-correction target relative rotational angle Δθta to be created by the steering gear ratio change unit is calculated on the basis of the target relative rotational angle Δθt and a vehicle speed range that has been determined on the basis of a vehicle speed V. Thus, a target relative rotational angle in one lateral direction is so corrected as to be equal to or smaller than a difference between a permissible rotational angle to be defined by a spiral cable in the other lateral direction and a maximum possible rotational angle of the lower steering shaft in the other lateral direction. An electric motor is controlled on the basis of the post-correction target relative rotational angle Δθta.
REFERENCES:
patent: 4956590 (1990-09-01), Phillips
patent: 6164150 (2000-12-01), Shindo et al.
patent: 6367577 (2002-04-01), Murata et al.
patent: 6763908 (2004-07-01), Ogawa et al.
patent: 2003/0150666 (2003-08-01), Ogawa et al.
patent: 11001175 (1999-01-01), None
Kawamuro Junji
Kojo Takahiro
Nakatsu Masatoshi
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