Turbocharged engine

Abstract

An improvement in a turbocharged engine of the type that includes an exhaust turbine driven by exhaust gases from the cylinders of the engine, and which drives a compressor located along an inlet conduit leading to the engine to supply compressed air to the cylinder. The improved system includes a recirculating passage which can carry compressed air from a point along the inlet conduit downstream of the compressor, back to a point along the inlet conduit which is upstream from the compressor turbine, to recirculate the air. A valve located along the recirculating passage, is operated by sensors detecting when the engine is operated at high loads, to then open the valves to cause recirculation of the air pumped by the compressor. The recirculation not only reduces the air pressure supplied to the cylinder to avoid overcharging of the engine, but also causes the two turbines to spin faster to minimize exhaust back pressure for greater engine efficiency and to enable the turbocharger impeller to pick up speed faster after a gear change.

Dependencies are inferred from the claim text.