| 摘要 |
<p>PROBLEM TO BE SOLVED: To structure EGR tube as radiating tube, simplify cooling structure of exhaust gas, and restrain occurrence of knocking and generation of NOx. SOLUTION: This EGR system of engine consists of turbo charger 3 set in exhaust pipe 17, DPF device 2 set at exhaust pipe 17 after turbo charger 3 in flow, and EGR device supplying part of exhaust gas to combustion room from exhaust pipe 24 after DPF device 2 in flow. EGR device is composed of EGR tube comprising exhaust pipe 24 connected to intake pipe 23 and radiation passage 25 having concave and convex surfaces outside to increase radiating surface, EGR pump 8 fitted in EGR tube 4, EGR control valve 11 controlling flux of exhaust gas fitted in EGR tube.</p> |
