Control device for an internal combustion engine for preventing considerable deviation in amounts of oxygen from a required level in a gas intake holds pre-change exhaust gas with oxygen feeding it back into an intake channel.

摘要

If oxygen concentration in exhaust gas alters because of changes in engine (11) condition, an exhaust gas return channel (42) holds some pre-change exhaust gas with an oxygen concentration feeding it back into an intake channel (32). If a throttle valve (23) opens an amount required by oxygen concentration after changes in returned exhaust gas, the amount of oxygen in the total gas volume taken into the engine's combustion chamber swings well away from a desired level.