| 摘要 |
PROBLEM TO BE SOLVED: To recognize a position which is falsely obtained due to interruption of electrical energy supply for a sensor. SOLUTION: A system is equipped with the sensor (14) for obtaining the position of a movable element (20), and a first electrical energy accumulator (13), wherein the first electrical energy accumulator (13) supplies electric energy to at least a part of the sensor (14) so that stored contents of count of the sensor (14) is maintained under abnormal lowering of an external supply voltage (U<SB>v</SB>), when the external supply voltage (U<SB>v</SB>) of the sensor (14) abnormally drops. The first electrical energy accumulator (13) generates first auxiliary supply voltage (U<SB>H1</SB>), first data (12) is stored in the sensor (14) when a reference mark (3) of the sensor (14) is detected for the first time, the first data (12) is deleted at the abnormal lowering of the external supply voltage (U<SB>V</SB>) of the sensor and the abnormal lowering of the first auxiliary supply voltage (U<SB>H1</SB>) of the sensor (14). COPYRIGHT: (C)2009,JPO&INPIT
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