Controlling EGR in an internal combustion engine and fluid pressure signal controller therefor

摘要

Engine exhaust gas is recirculated by a fluid pressure actuated valve receiving a control signal from a controller which receives and modulates engine induction vacuum to provide a primary source and receives a carburetor throttle-blade controlled suction as a secondary source and compares the primary and secondary sources and discriminates therebetween to provide the lesser as the outward control signal.