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논문 기본 정보

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(조선대학교) (조선대학교) (코렌스글로벌) (조선대학교)
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한국자동차공학회 한국자동차공학회논문집 한국자동차공학회논문집 제33권 제9호
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    초록·키워드

    Low Pressure-Exhaust Gas Recirculation(LP-EGR) is a combustion technology designed to reduce NOx emissions in internal combustion engines. However, the DC motor used to control the EGR valve undergoes performance degradation due to the extreme environmental conditions within the EGR system. This study numerically investigated the performance degradation of the DC motor over time at temperatures of 25 ℃, 160 ℃, and –20 ℃. A 0D mathematical model was developed to predict performance degradation and validated using convective heat transfer coefficients obtained from continuous current test results provided by KORENS Global. In particular, the time required to reach a steady-state temperature was determined based on the inverse relationship between the heat transfer coefficient and the thermal time constant. The results showed faster stabilization at –20 ℃ and accelerated performance degradation at 160 ℃. During maximum output operation, temperature distribution was visualized through CFD analysis using CONVERGE, which revealed the occurrence of thermal stress at the stator-rotor interface.

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      UCI(KEPA) : I410-151-25-02-093904010