Cooled two-stage turbocharging system

摘要

An internal combustion engine includes a cylinder block defining a cylinder, a cylinder head, and an exhaust manifold operatively connected to the cylinder head and configured to exhaust post-combustion gasses from the cylinder. The engine also includes a turbocharging system configured to pressurize an airflow for delivery thereof to the cylinder. The turbocharging system includes a low-flow turbocharger having a first turbine housing and a high-flow turbocharger having a second turbine housing. Each turbocharger is configured to be driven by the post-combustion gasses from the exhaust manifold in order to pressurize the airflow and discharge the pressurized airflow to the cylinder. The turbocharging system also includes a flow control device for selectively directing the post-combustion gasses to the low-flow and high-flow turbochargers. The turbocharging system additionally includes a cooling module configured to cool the second turbine housing. A vehicle employing such an engine is also disclosed.

主权项

1. An internal combustion engine comprising:
a cylinder block defining a cylinder; a cylinder head mounted to the cylinder block and configured to supply air and fuel to the cylinder for combustion therein; an exhaust manifold operatively connected to the cylinder head and configured to exhaust post-combustion gasses from the cylinder; a turbocharging system configured to pressurize an airflow being received from the ambient for delivery to the cylinder, the turbocharging system including:
a low-flow turbocharger having a first turbine housing and configured to be driven by the post-combustion gasses from the exhaust manifold, to pressurize the airflow, and to discharge the pressurized airflow to the cylinder;a high-flow turbocharger having a second turbine housing and configured to be driven by the post-combustion gasses from the exhaust manifold, to pressurize the airflow, and to discharge the pressurized airflow to the cylinder;a flow control device configured to selectively direct the post-combustion gasses to the low-flow turbocharger and the high-flow turbocharger; anda cooling module configured to cool the second turbine housing; and a programmable controller configured to regulate operation of the flow control device, wherein the controller is programmed to: close the flow control device to direct the post-combustion gasses to the low-flow turbocharger and open the flow control device to direct the post-combustion gasses to the high-flow turbocharger; close the flow control device below a predetermined flow rate of the post-combustion gas and open the flow control device at or above the predetermined flow rate; and regulate operation of the cooling module via a fluid valve.