Stray magnetic field cancellation for steering torque sensor

A method for steering torque sensor stray magnetic field cancellation, the method comprising:

• receiving, from at least one magnetic sensor disposed within a torque sensing region, a detected magnetic field corresponding to an angular displacement between an upper steering shaft and a lower steering shaft of an electronic power steering system;
• generating a first torque signal based on the detected magnetic field;
• receiving, from at least one stray region sensor disposed outside of the torque sensing region, a detected stray magnetic field;
• determining a torque signal error based on the detected stray magnetic field;
• generating a second torque signal based on the first torque signal and the torque signal error;
• and
• selectively controlling at least a portion of the electronic power steering system using the second torque signal.

An apparatus comprising:

• at least one magnetic sensor that detects a magnetic field within a torque sensing region, the detected magnetic field corresponding an amount of torque applied to a handwheel associated with an electronic power steering system;
• at least one stray region sensor that detects a stray magnetic field outside of the torque sensing region, the detected magnetic field being influenced by the detected stray magnetic field;
• and
• a controller configured to:
• generate a first torque signal based on the detected magnetic field;
• determine a torque signal error based on the detected stray magnetic field;
• generate a second torque signal based on the first torque signal and the torque signal error;
• and
• selectively control at least a portion of the electronic power steering system using the second torque signal.