SELF ALIGNMENT TORQUE CORRECTION DEVICE FOR VEHICLE AND ELECTRIC POWER STEERING DEVICE

• Main Authors: NISHIZAWA YOICHI, AOKI KANAME, KONDO HIROYUKI
• Format: Patent
• Language: English
• Published: 05.08.2003
• Edition: 7
• Subjects: LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MOTOR VEHICLES; PERFORMING OPERATIONS; TRAILERS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a self alignment torque correction device for a vehicle capable of easily correcting self alignment torque. SOLUTION: Auxiliary steering force from an electric motor M is applied to a steering mechanism 3. A target current value setting part 22 sets up a target current value Iobj of the electric motor based on steering torque and vehicle speed. A self alignment torque correction control part 24 has a steering angle adaptive compensation part 41 generating correction current Iθ corresponding to the steering angle, vehicle speed adaptive compensation part 42 generating compensation gain k corresponding to the vehicle speed, and a multiplication processing part 43 generating correction value Ib(=k.Iθ) by multiplying the correction current Iθ by the correction gain k. The target current value Iobj is corrected by the correction value Ib and the electric motor M is controlled by the target current value (Iobj+Ib) after being corrected. COPYRIGHT: (C)2003,JPO