| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power steering device capable of estimating a neutral point with high accuracy when a steering wheel is returned, and efficiently returning a steering mechanism. SOLUTION: A neutral point estimation unit 200 comprises a fuzzy inference unit 210 for outputting the neutral point estimation degree C1 related to the steering angular velocityωwith the steering angular velocityωas an input, a fuzzy inference unit 220 for outputting the neutral point estimation degree C2 related to the steering torque T with the steering torque T as an input, and a fuzzy inference unit 240 for outputting the neutral point estimation degree C4 related to the vehicle speed V and the elapsed time t with the vehicle speed V and the elapsed time t as an input. C1 is multiplied by C2, the product is multiplied by C4 to obtain C5 (Cm), and the neutral point estimation degree Cm with higher accuracy is obtained by the repeated operation. The current instruction of a steering auxiliary motor is corrected by using the current parameter, the width parameter of the dead band when the steering wheel is returned, and the parameter corresponding to the vehicle speed based on the neutral point estimation degree Cm. |
