건설기계엔진에서 Cooled E-EGR System의 배출가스 특성

It is known that EGR is the best method dramatically decreasing NOx in diesel engine. but PM increase by trade-off. In this study, EGR was applied to construction machine for decreasing NOx and satisfying Tier Ⅲ regulation. This E-EGR is cooled by water and controled electrically. Test engine satisfy Tier Ⅱ regulation and is 13L and D9406TI. Test engine exhausted much NOx on more low speed and high load than high speed and load operation condition. NMHC+NOx is 5.161g/㎾ㆍh and PM is 1.117g/㎾ㆍh on the base. After applied, NMHC+NOx decreased to 3.735g/㎾ㆍh and PM decreased to 1.172g/㎾ㆍh. We checked that Tier Ⅲ regulation was satisfied by applying E-EGR.