| 摘要 |
An improved intake control apparatus for internal combustion engines which can reduce the amount of nitrogen oxide in the exhaust gas by additionally feeding a part of the exhaust gas as well as air or lean mixture gas into an intake system in correlation with the operating condition of the engine. The improved apparatus is characterized by the provision of an exhaust gas recirculation path communicating the exhaust path with the intake path for recirculating a part of the exhaust gas, at least two exhaust gas recirculation rate control valves in said exhaust gas recirculation path in series with each other, a diluting intake path disposed in the exhaust gas recirculation path between two particular control valves among the plurality of control valves for taking in atmospheric air or lean mixture gas, and an intake control valve in the diluting intake path. |
