Patent ID: 9120500
Filing Date: 2015-09-01
Classification: B62D

Abstract:
1. In a vehicle having a processor, a plurality of sensors providing signals to the processor during operation of the vehicle and a Electric Power Steering (EPS) system responsive to the processor to attenuate smooth road shake occurring in a steering wheel during operation of the vehicle, a method, comprising: (a) receiving, by the processor, a signal representing vehicle speed from one of the plurality of sensors during operation of the vehicle and using the vehicle speed as an estimation of an average angular wheel speed of at least one wheel of the vehicle; (b) determining, by the processor, an average wheel angle from the estimation of the average angular wheel speed; (c) generating, by the processor, sine and cosine functions of the average angular wheel angle; (d) processing, by the processor, 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; (e) processing, by the processor, the amplitude components to provide a corrected average angular wheel speed; (f) reconstructing, by the processor, the sine and cosine functions using the steering wheel torque signal; (g) combining, by the processor, the sine and cosine functions to provide a control signal; and (h) repeating steps (a) through (g) during operation of the vehicle resulting in the processor controlling an actuator in the EPS system via the control signal to attenuate the smooth road shake vibrations in the steering wheel of the vehicle.