Electric power steering systems and methods

摘要

An electric power steering system for a vehicle includes a steering mechanism coupling a steering wheel to a steerable element. A first actuator is in communication with a controller and operatively connected to the steering mechanism for assisting movement of the steerable element in response to a first signal from the controller. The system also includes a second actuator in communication with the controller, separate from the first actuator, and operatively connected to the steering mechanism between the first actuator and the steering wheel for superimposing torque in response to a second signal from the controller.