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Digital EGR System

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.