| 摘要 |
PROBLEM TO BE SOLVED: To enhance the reduction efficiency of a nitrogen oxide through exhaust gas recirculation by reducing oxygen in a recirculation gas to positively lower combustion temperature in an exhaust gas recirculation device. SOLUTION: An exhaust gas recirculation pipe 20 is provided with an exhaust gas recirculation(EGR) cooler 22. A burner 24 for burning oxygen in an exhaust gas is provided on the exhaust gas recircuilation pipe 20 in the upperstream of the EGR cooler 22. The burner 24 burns the oxygen, etc., in the exhaust in idling an engine 15 or in applying a low load to the engine 15 to reduce an amount of oxygen in a recirculation gas flowing an intake pipe 12. |
