Control system for an exhaust gas recirculation system

摘要

Two diaphragms divide a vacuum motor which controls the flow of exhaust gases from the exhaust passage to the induction system into three chambers, the first is fed a modulated vacuum signal from the induction passage, the second either an uncontrolled signal from substantially the aforementioned part of the induction passage or a VC vacuum created immediately upstream of the position assumed by the throttle valve in a fully closed position and the third exposed to atmospheric pressure. A relief valve disposed in the conduit through which the modulated vacuum is fed opens upon the pressure therein falling to a predetermined level to further modulate the vacuum in the first chamber.