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Digital EGR System

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The digital EGR valve is designed to accurately supply EGR to engine, independent of intake manifold vacuum. The valve controls EGR flow from exhaust to intake manifold through 3 orifices, to produce 7 different combinations. When a solenoid is energized, the armature with attached shaft and swivel pintle is lifted to open the orifice.

Fig 1: Digital EGR Valve
G55855Courtesy of GENERAL MOTORS CORP.