Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2008-03-11
2008-03-11
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C180S442000, C180S444000
Reexamination Certificate
active
07341125
ABSTRACT:
The invention provides an electric power steering apparatus which can improve a steering feeling. In the electric power steering apparatus, in the case that once the electric abnormality is generated in the hardware such as the motor, the torque sensor or the like and an output of the assist force by the motor is reduced, however, the electric abnormality is thereafter dissolved due to some kind or another reason, the output of the assist force by the motor is increased immediately to an intermediate target value (within a broken line α). Accordingly, it is possible to prevent such a steering feeling as the steering wheel becomes suddenly heavy. Further, since the output of the assist force is gradually increased to a reset target value (within a broken line β) after the output of the assist force by the motor is increased to the intermediate target value, it is possible to prevent such a steering feeling as the steering wheel becomes suddenly light on the basis of the thereafter increase of the assist force even if the steering wheel becomes heavy to some extent. Accordingly, it is possible to smoothly change to the assist at a normal time from the assist at an abnormal time while preventing the steering ineffective feeling, and it is possible to improve the steering feeling.
REFERENCES:
patent: 4972320 (1990-11-01), Sugiura et al.
patent: 5504679 (1996-04-01), Wada et al.
patent: 5765661 (1998-06-01), Matsuoka
patent: 6041884 (2000-03-01), Shimizu et al.
patent: 6397969 (2002-06-01), Kasai et al.
patent: 0 863 065 (1998-09-01), None
patent: 2 351 714 (2001-01-01), None
patent: 10-181616 (1998-07-01), None
JTEKT Corporation
Morris Lesley D.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Stabley Michael
LandOfFree
Electric power steering apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric power steering apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric power steering apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2788291