Drive flow control for vacuum generator vacuum generator and compressor bypass

摘要

An engine system comprising: first and second suction devices each comprising a suction tap in a throat of the suction device, a suction tap in an expansion cone of the suction device, and a suction tap in a straight tube, downstream of the expansion cone, the first suction device having a a drive inlet connected to an engine suction and a mixed flow outlet connected to the suction downstream of a main throttle, and wherein the second suction device comprises a mixed flow outlet connected to the suction downstream of the drive inlet of the first suction device and a drive inlet connected to the suction upstream of the main throttle.