Fault detection unit for rotation angle detecting device

Details Fault detection unit for rotation angle detecting device Fault detection unit for rotation angle detecting device

2007-06-04

2010-02-16

Lau, Tung S (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

Reexamination Certificate

active

07664619

ABSTRACT:
A fault detection unit detects a fault occurred in a detecting device which detects a rotational angle of a rotor with respect to a stator from sine and cosine wave signals having amplitudes modulated in a sinusoidal wave shape in a cycle of rotation of the rotor. The unit produces a judging value from the signals, judges occurrence of a fault from the value placed out of a normal range, and judges the device to be in a tentative fault state when the judgment is continued. After this judgment, when the rotational angle is changed over its entire range while the value is placed within the normal range, the unit judges the device to have returned to a normal state. In contrast, when the judgment is still continued, the unit judges the device to be in a determinate fault state and decides the occurrence of the fault.

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Chinese Office Action dated Nov. 14, 2008, issued in counterpart Chinese Application No. 200710142395.9, with English translation.

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