Motor-driven servo steering system

Motor-driven servo steering system for a motor vehicle, said steering system comprising:

• an actuator for superimposed steering intervention, said actuator including first means for transmitting first power by means of a first input shaft, with said first power having first torque and first angular velocity;
• second means for transmitting second power by a second input shaft, with said second power having second torque and second angular velocity;
• and third means for additively combining said first power and said second power to provide third power to an output shaft, said third power having third torque and third angular velocity, and said third power substantially equalling the sum of said first power and said second power disregarding frictional losses;
• a steering system for the vehicle, said steering system being operably connected to said output shaft of said actuator;
• a steering wheel for transmitting steering wheel power to said first input shaft of said actuator, said steering wheel power including steering wheel torque and steering wheel angular velocity;
• an electric motor for providing output power to said second input shaft of said actuator, said electric motor controlled by a controller, said output power having output torque and output angular velocity;
• means for monitoring said steering wheel angular velocity and providing angular velocity signals when said steering wheel is actuated by the driver;
• and
• means for transmitting said angular velocity signals to said controller.