Internal engine is the main power source of vehicle and is the main source of air pollution. To satisfy this getting rigorous emission regulation, it must be solved simultaneously the dilemma of reducing emission gas and increasing heat efficiency. Diesel engine is preferred compare with gasoline engine in aspect of energy consumption but it must be solved reducing the containing of NOx, CO and HC. In this study: 1. Looking for alternative of performance improvement of Exhaust Gas Recirculation(EGR) which is emission gas reduction system. 2. Reducing malfunction of controlling emission gas. 3. Made possible precision control.

Abstract
 1. 서 론
 2. AHP를 활용한 개선인자 도출
 3. EGR 성능개선
  3.1 시트리크 개선
  3.2 센서편차의 개선
 4. 결 론
  4.1 결 론
  4.2 연구 한계
 5. References
 저 자 소 개

• 정순석(한국교통대학교 산업경영공학과) | Soon Suk Chung Corresponding Author
• 허윤복(한국교통대학교 산업경영공학과) | Yun bok Heo
• 김광수(한국교통대학교 산업경영공학과) | Kwang Soo Kim