The effect of EGR on fuel economy was investigated in a gasoline direct injection engine. The 1-D cycle simulation program of GT-Power was utilized to evaluate fuel consumption rate. At high load, fuel consumption increased by about 2~6% according to EGR rate. Knock mitigation was the main effects, gaining about 80% of the total fuel consumption improvement. At low load, fuel consumption reduction was 0.6~2%, which was much lower than that for high load. The lower improvement of fuel consumption at low load is attributed to solely dilution and chemical effects of exhaust gas.

1. 서 론
 2. 엔진 성능해석 방법
 3. 결과 및 해석
 4. 결 론
 후 기
 References

• 백동훈(Dept. of Mechanical & Automotive Engineering Seoul National University of Science and Technology) | D. H. Baik
• 이수룡(Dept. of Mechanical & Automotive Engineering Seoul National University of Science and Technology) | S. R. Lee Corresponding Author