Patent ID: 11873042
Assignee: SENTIENT IP AB
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for controlling vehicle steering in a vehicle comprising a vehicle steering system comprising a feedback torque actuator arranged in series with an angle overlay actuator, the feedback torque actuator comprises an electric power assisted steering, the method comprising controlling said angle overlay actuator in such a way that a target overlay angle is achieved, wherein said feedback torque actuator is arranged above said angle overlay actuator, and in that the method comprises the steps of:
controlling said angle overlay actuator so that a variable steering ratio as well as an additional overlay angle are provided, and controlling said feedback torque actuator in such a way that a target feedback torque is achieved and in such a way that a target steering feel is achieved, resulting in the angle overlay being controlled at the same time as the steering-wheel torque being controlled whereby a target overlay angle and a good steering feel is achieved; and
controlling said feedback torque actuator by using a reference generator, wherein the controlling of the reference generator for achieving a target steering feel, a feedback torque to vehicle response relation describing steering feel, comprises a closed loop control method comprising calculating a reference or target overlay angle value, then controlling the steering assistance of the feedback torque actuator to minimize the error between the target overlay angle value and a corresponding measured overlay angle so that the target steering feel is achieved.