System and method for reducing steering wheel vibration in electronic power steering systems

An Electronic Power Steering (EPS) system, comprising:

• a sensor providing an average angular wheel speed of at least one wheel of a vehicle;
• and
• a processor configured to:
• determine an average wheel angle from the average angular wheel speed;
• generate sine and cosine functions of the average angular wheel angle;
• process the sine and cosine functions with a steering wheel torque signal received from a torque sensor to extract amplitude components of at least one of the sine and cosine functions;
• reconstruct the sine and cosine functions using the steering wheel torque signal;
• combine the sine and cosine functions to provide a control signal;
• and
• control the EPS system via the control signal;
• wherein smooth road shake vibrations in a steering wheel of the vehicle are attenuated.

A vehicle, comprising:

• wheels by which the vehicle can be propelled and steered;
• an Electronic Power Steering (EPS) system coupled to one or more of the wheels;
• a sensor providing an average angular wheel speed of at least one of the wheels of the vehicle;
• and
• a processor configured to:
• determine an average wheel angle from the average angular wheel speed;
• generate sine and cosine functions of the average angular wheel angle;
• process the sine and cosine functions with a steering wheel torque signal received from a torque sensor to extract amplitude components of at least one of the sine and cosine functions;
• reconstruct the sine and cosine functions using the steering wheel torque signal;
• combine the sine and cosine functions to provide a control signal;
• and
• control the EPS system via the control signal;
• wherein smooth road shake vibrations in a steering wheel of the vehicle are attenuated.