| 摘要 |
A method of operating an angular position sensor for an electric power assisted steering system of the kind in which an eclectic motor applies an assistance torque to a portion of a steering mechanism comprises at least one angular position sensor. Said sensor is provided to produces an output signal having a plurality of discrete output states, the output changing between the states as a function of the angular position of <B>either the</B> steering mechanism or the motor rotor. The method includes steps of detecting the transitions between the output of the sensor and from this modifying a count value which gives a measure of the angular position of the sensor. The at least one sensor is alternately powered up and powered down at a frequency which is lower than the maximum expected frequency of transition between states of the sensor output. |
