INTERNAL COMBUSTION ENGINE WITH DUAL INDUCTION SYSTEM AND WITH FUEL INJECTION SYSTEM TO DISCHARGE FUEL INTO SECONDARY INDUCTION SYSTEM

摘要

A dual induction system is provided wherein a single inlet valve controls both the primary and secondary induction systems thereof and wherein for each cylinder a single injector is provided which injects fuel into the secondary induction system so as to impinge on the back of the valve head of said single inlet valve. An air flow meter senses the total air flow through the primary and secondary induction systems and outputs a signal to a control apparatus which in turn controls the amount of fuel injected by the injector. The air flow through the primary induction system is controlled by a manually controlled throttle valve, while the second is controlled by a vacuum motor responsive to the air flow in the primary system. The primary induction system is adapted to introduce air into the cylinder so that the air swirls around the axis thereof while the secondary system is adapted to introduce air into the cylinder under given modes of operation of the engine so as to impede the swirl produced by the primary system. Thus a rapid swirling lean mixture can be combusted at low RPM while a richer mixture having a lower swirl rate can be combusted at higher RPM.