| 摘要 |
PROBLEM TO BE SOLVED: To provide an EGR device that even with a relatively simple and inexpensive structure, can perform operation at a high EGR rate without increasing pumping loss or the like, and thereby can effectively reduce discharge black smoke concentration and a NOx emission amount while maintaining good fuel economy.SOLUTION: An EGR device 200 includes: a first exhaust valve 31; a second exhaust valve 41; a first intake valve 11; a second intake valve 21; a first exhaust port 30; a second exhaust port 40; a first intake port 10; a second intake port 20; a first exhaust passage 32; a second exhaust passage 42; a first intake passage 12; a second intake passage 22; an intake-to-exhaust passage 60 connecting the first exhaust passage 32 and the first intake passage 12; an intake-to-exhaust valve 61; and a flow channel switch valve 13. |
