Controlling exhaust gas flow divided between turbocharging and exhaust gas recirculating
AssigneeBorgWarner Inc.
InventorDavid B. Roth
Life of this patent
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Abstract
A method of controlling exhaust gas flow in an internal combustion engine system, and products and systems using same.
Claims35
A method of controlling an internal combustion engine system, which includes a turbocharged engine with divided exhaust gas flow between blowdown and scavenging exhaust valves, and also includes induction and exhaust subsystems in communication with the engine and an exhaust gas recirculation (EGR) subsystem in communication across the induction and exhaust subsystems, the method comprising:
- communicating the blowdown exhaust valve with the exhaust subsystem, and the scavenging exhaust valve with the (EGR) subsystem downstream of the engine;
- varying timing of the exhaust valves to apportion exhaust gas flow between a turbocharger turbine in the exhaust subsystem and the EGR subsystem;
- and
- apportioning scavenging exhaust gas flow through the EGR subsystem.
A method of controlling an internal combustion engine system, which includes a turbocharged engine with divided exhaust gas flow between blowdown and scavenging exhaust valves, and also includes induction and exhaust subsystems in communication with the engine and an exhaust gas recirculation (EGR) subsystem in communication across the induction and exhaust subsystems, the method comprising:
- communicating the blowdown exhaust valve with the exhaust subsystem, and the scavenging exhaust valve with the (EGR) subsystem downstream of the engine;
- and
- driving multiple turbocharger turbines in the exhaust subsystem with blowdown exhaust gas.
An internal combustion engine system, including:
- a turbocharged internal combustion engine including a blowdown exhaust valve and a scavenging exhaust valve;
- an induction subsystem to deliver induction gases to the engine;
- an exhaust subsystem to carry exhaust gases away from the engine, and including a blowdown exhaust manifold in communication with the blowdown exhaust valve of the engine, and a scavenging exhaust manifold in communication with the scavenging exhaust valve of the engine;
- a turbocharging subsystem including a compressor in the induction subsystem and a turbine in the exhaust subsystem in communication with the blowdown exhaust manifold;
- and
- an exhaust gas recirculation (EGR) subsystem in communication across the exhaust and induction subsystems, and including at least one EGR valve in communication with the scavenging exhaust manifold.
Dependencies are inferred from the claim text.