Patent ID: 8892395
Filing Date: 2014-11-18
Classification: G01D,H02K

Abstract:
1. A method for detecting angular position of a rotating device, the method comprising: sensing low-resolution transitions of a low-resolution digital sensor in response to the rotating device rotating; sensing and counting high-resolution transitions of a high-resolution digital sensor in response to the rotating device rotating; sensing and counting other high-resolution transitions of another high-resolution digital sensor in response to the rotating device rotating; determining an angular position of the rotating device in response to determining a number of high-resolution transitions between pairs of low-resolution transitions; and comparing the low-resolution transitions, the high-resolution transitions, and the other high-resolution transitions to determine a direction of rotation of the device, wherein each pair of consecutive low-resolution transitions defines a respective low-resolution pulse that is in either a high state or a low state, and wherein each low-resolution pulse has a respective duration that is specified by a number of high-resolution transitions that occurs during each respective low-resolution pulse, and wherein the respective durations of any three consecutive low-resolution pulses differ from one another by at least two high-resolution transitions.