公开(公告)号：US3901203A

公开(公告)日：1975-08-26

申请号：US38175473

申请日：1973-07-23

申请人： GEN MOTORS CORP

发明人： POZNIAK DONALD J

IPC分类号： F02B1/04 ,  F02M25/07 ,  F02M25/06

CPC分类号： F02M26/58 ,  F02B1/04 ,  F02M26/55 ,  F02M26/70

摘要： An exhaust gas recirculation system for an internal combustion engine with a carburetor and a throttle for controlling air-fuel flow to the intake manifold of the vehicle; an exhaust gas recirculation conduit is connected between the vehicle exhaust and an induction passageway between the carburetor and the throttle. Valve means are operated in accordance with the intake manifold pressure to vary the amount of exhaust gas recirculation into the induction manifold, the valve having a high rate flow area scheduled to produce an increasing ratio of exhaust gas recirculation to intake air flow so as to continually increase the exhaust gas recirculation on increasing engine load thereby to maintain reduced vehicle NOx emissions during all operating conditions.