Electric power steering apparatus and control method for the same, apparatus for synchronization dual steering motor and method i'hereof

A control method of an electric power steering apparatus comprising:

• operating a first motor for providing a force for movement of a rack and a second motor for providing a force for movement of the rack in synchronized with the first motor;
• detecting a torque value and a steering angle according to a steering of a steering wheel;
• detecting an operation state of the first motor and an operation state of the second motor;
• and
• controlling an operation of the first motor and the second motor based on the torque value, the steering angle, the operation state of the first motor and the operation state of the second motor.

An apparatus for synchronizing a steering assist motor comprising:

• a receiver configured to receive a steering angle speed information, a first motor RPM information and a second motor RPM information for a first motor and a second motor as steering assist motors from a sensor mounted to a vehicle;
• an abnormality occurrence determiner configured to determine an RPM synchronization of the first motor and the second motor according to a comparison result of the first motor RPM information and the second motor RPM information, to determine an existence of an abnormality occurrence motor, and to determines the abnormality occurrence motor;
• an additional torque determiner configured to determine, if one of the first motor and the second motor is the abnormality occurrence motor, an additional torque to be applied to the abnormality occurrence motor based on at least one of steering angle speed motor output matching table information predetermined for each motor, the first motor RPM information, the second motor RPM information or the steering angle speed information;
• and
• a motor current controller configured to control a current to be applied to the abnormality occurrence motor based on the additional torque.

A method for synchronizing a steering assist motor comprising:

• Receiving a steering angle speed information, a first motor RPM information and a second motor RPM information for a first motor and a second motor as steering assist motors from a sensor mounted to a vehicle;
• determining an RPM synchronization of the first motor and the second motor according to a comparison result of the first motor RPM information and the second motor RPM information, determining an existence of an abnormality occurrence motor, and determining the abnormality occurrence motor;
• determining, if one of the first motor and the second motor is the abnormality occurrence motor, an additional torque to be applied to the abnormality occurrence motor based on at least one of steering angle speed motor output matching table information predetermined for each motor, the first motor RPM information, the second motor RPM information or the steering angle speed information;
• and
• controlling current to be applied to the abnormality occurrence motor based on the additional torque.