| 摘要 |
An internal combustion engine has a conventional principal induction passage. The engine is further provided with an auxiliary induction passage having a smaller cross-section and adapted to discharge a charge into a combustion chamber so as to cause turbulence therein. An auxiliary throttle valve downstream from the principal throttle valve of the system can be closed to cause the preponderant portion of the flow of air or of air/fuel mixture to flow through the auxiliary induction passage at light and medium loads. Exhaust gas recirculation is permitted at light and medium loads and is mixed with the air or air/fuel mixture at said low and medium loads and injected into the cylinder where it is well mixed by the resulting turbulence. As a consequence, higher concentrations of exhaust gas can be recirculated while still enjoying smooth engine operation.
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