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专利名称：Exhaust gas recirculation control apparatus发明人：Radek A. Oleksiewicz申请号：US09/188722申请日：19981109公开号：US06014960A公开日：20000118
摘要：An internal combustion engine includes an exhaust gas recirculation controlapparatus includes first and second normally closed valves having different flow areaswhich open to provide communication between a corresponding bank of an exhaustmanifold and an intake manifold. Each valve is engaged to an actuator which reciprocatesthe valve between a fully open and fully closed position. Both actuators are
independently operable under control of an ECU programmed to monitor operationalparameters of a specific engine via sensors functionally engaged thereto to maintain theengine at a level of optimum performance, the ECU producing in response to sensorinput, a no-flow level and an appropriate one of three possible active levels of
recirculation. A no- flow level maintaining both valves closed allows no recirculation, anactive first level maintaining both valves open allows maximum recirculation, an activesecond level maintaining a larger valve open allows less than maximum recirculation andan active third level maintaining a smaller valve open allows a level of recirculationgreater than none.
申请人：NAVISTAR INTERNATIONAL TRANSPORTATION CORP
代理人：Dennis K. Sullivan,Jeffrey P. Calfa
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