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http://dx.doi.org/10.3795/KSME-C.2015.3.3.175

A Study On Cause Analysis and Improvement About Malfunction of Proximity Sensor Exposed High Temperature  

Park, Jin-Saeng (Defence Agency for Technology and Quality)
Publication Information
Transactions of the KSME C: Technology and Education / v.3, no.3, 2015 , pp. 175-181 More about this Journal
Abstract
Because internal space of combat vehicle reachs about $80^{\circ}C$ at high temperature period, Proximity Sensor exposed high temperature and humidity, which has function to sense the distance and transfer signal for control unit, have enlarged sensing distance and finally locked on. Malfunction of sensing itself occur frequently, therefore we carried out cause analysis and improvement. We accomplish improvement activity secondly. Through-out many trial and error, we find out that malfunction of sensor occur at high temperature circumstance. To improve, the another Emitter Coil is added to increase voltage difference and improve sensing accuracy about 5~10 times. And we accomplish design improvement to dull temperature and humity change after increasing molding surface to add vibration and shock resistance. We prove that the improved product do not fail after enduring 136hr at $85^{\circ}C$ temperature and 85% relative humidity circumstance chamber.
Keywords
Sensible Distance; Lock on; Temperature Profile; Emitter Coil; NTC Thermister;
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