Patent ID: 8516816
Filing Date: 2013-08-27
Classification: F02M

Abstract:
1. A method for operating an engine system having a cylinder, an exhaust turbine and an intake-air compressor, the method comprising: charging the cylinder with exhaust from upstream of the exhaust turbine at a first rate; charging the cylinder with exhaust from downstream of the exhaust turbine at a second rate via an external low-pressure (LP) exhaust-gas recirculation (EGR) path; increasing the second rate relative to the first rate in response to a coolant-overheating condition; and directing at least a portion of the exhaust through a waste gate, by-passing the exhaust turbine, combining the portion of the exhaust with exhaust flow from the exhaust turbine, in response to the coolant-overheating condition, the waste gate coupled across the exhaust turbine from an inlet to an outlet of the exhaust turbine.