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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakahiro Kojo, Junji Kawamuro, Masatoshi Nakatsu
Estimating the term…
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.
A vehicular steering control device comprising:
A control method for a vehicular steering device having an input portion coupled to a steering wheel that is operated by a driver, an output portion drivingly connected to steered wheels, a steering transmission ratio change device that changes a steering transmission ratio by causing the input portion and the output portion to rotate relative to each other by an actuator that rotationally operates in association with the steering wheel, and an electric connection mechanism that supplies the actuator with electric power from an external side, the control method comprising the steps of:
Dependencies are inferred from the claim text.