Device electropneumatic of regulation of an injection of the auxiliary air at the inlet of the internal combustion engines

摘要

An electro-pneumatic device for regulating the supply of air to an internal combustion engine having a carburettor is arranged to supply the air to the engine into a manifold downstream of the carburettor and the air supply is controlled to adjust the richness of the main stream of air and fuel entering the engine to control the richness of the combustible mixture. The device includes a pneumatic regulator valve having two stages in series with each other and the opening and closing of this valve is controlled, to adjust the rate of air supply, by a command pressure produced by connecting the valve alternately to a source of the mixture delivery pressure from the carburettor and a source of higher pressure. This alternate connection is effected by an electrically-operated valve actuated by a signal of square wave form, the frequency of which is a function of engine speed and of a signal delivered by a sensor which senses the composition of the exhaust gases from the engine.