Electric power steering system for vehicles
AssigneeHonda Giken Koygo Kabushiki Kaisha
InventorsYasuo Shimizu, Toshitake Kawai
Life of this patent
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Abstract
An electric power steering system (200) for vehicles including a driving control circuit (76, 100, 108) for feeding, in consideration of an output signal (S.sub.1, S.sub.2) from a steering torque detection mechanism (77) for detecting steering torque (Ts) acting on an input shaft (4), a drive signal (Va) to an electric motor (33) for producing auxiliary torque to be supplied to an output shaft (7). In the steering system, the auxiliary torque to be developed at the electric motor (33) is reduced, under the condition that a steering angle (Th) of the steering wheel has exceeded a predetermined angle (Th.sub.1).
Claims7
An electric power steering system for vehicles comprising:
- an input shaft operatively connected to a steering wheel;
- an output shaft operatively connected to a steered wheel;
- an electric motor for operatively supplying auxiliary torque to said output shaft;
- steering torque detection means for detecting steering torque acting on said input shaft;
- driving control means for feeding said electric motor with a motor drive signal based on an output signal from said steering torque detecting means;
- steering angle detection means for detecting a steering angle of said steering wheel;
- and
- correction means for gradually decreasing said motor drive signal to reduce said auxiliary torque to be developed at said electric motor, when said steering angle of said steering wheel is detected to be exceeding a predetermined angle by said steering angle detection means, said predetermined angle being slightly less than a maximum steering angle of said steering wheel.
Dependencies are inferred from the claim text.