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US 11,230,970 B2Granted
Exhaust system with integrated exhaust pulse converter
AssigneeCummins Inc.
InventorsAlexander T. Woods, Nikhil Jayant Ajotikar, Kristopher Ray Young
Life of this patent
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Abstract
An exhaust system includes an exhaust manifold structured to be fluidly coupled to an engine. A turbocharger including a turbine housing is fluidly coupled to the exhaust manifold. An exhaust pulse converter includes a first portion integral to the exhaust manifold and a second portion integral to the turbine housing. The exhaust pulse converter is structured to reduce engine pumping losses by reducing cross-talk of exhaust blowdown events from the engine.
Claims20
An exhaust system, comprising:
- an exhaust manifold structured to be fluidly coupled to an engine (62);
- a turbocharger comprising a turbine housing fluidly coupled to the exhaust manifold;
- and
- an exhaust pulse converter comprising a first portion integral to the exhaust manifold and a second portion integral to the turbine housing, the exhaust pulse converter structured to reduce engine pumping losses by reducing cross-talk of exhaust blowdown events from the engine and;
- wherein the first portion of the exhaust pulse converter comprises a nozzle of the exhaust pulse converter.
2 more elements
A turbocharger turbine housing, comprising:
- an inlet;
- a volute;
- a diverging nozzle fluidly coupling the inlet and the volute;
- an exhaust gas recirculation outlet;
- and
- a diverging exhaust gas recirculation take-off fluidly coupled to the diverging nozzle and to the exhaust gas recirculation outlet.
3 more elements
A method, comprising:
- providing an exhaust system, comprising:
- an exhaust manifold, comprising:
- a first exhaust manifold portion fluidly coupled to first outlet ports of a first set of cylinders of an engine,
- a second exhaust manifold portion fluidly coupled to second outlet ports of a second set of cylinders of the engine, and
- a mixing portion fluidly coupling the first and second exhaust manifold portions, the mixing portion defining a nozzle, the mixing portion structured to alternatingly receive:
- a first exhaust gas stream from the first outlet ports in response to a first exhaust blow-down event in the first set of cylinders, and
- a second exhaust gas stream from the second outlet ports in response to a second exhaust blow-down event in the second set of cylinders;
- and
- a turbocharger fluidly coupled to the mixing portion of the exhaust manifold, the turbocharger comprising a turbine having a turbine housing, the turbine housing defining a diffuser;
- in response to the first exhaust blow-down event, accelerating, by the nozzle of the mixing device, flow of the first exhaust gas stream along a flow direction of the first exhaust gas stream so as to increase momentum of the first exhaust gas stream and prevent backflow, and reducing, by the nozzle, a pressure of the first exhaust gas stream so as to minimize cross-talk from the first exhaust blow-down event to the second exhaust blow-down event;
- receiving, by the turbine, the first and second exhaust gas streams;
- and
- decelerating, by the diffuser of the turbine, flow of the first and second exhaust gas streams so as to minimize wall friction flow losses of the first and second exhaust gas streams.
10 more elements
Dependencies are inferred from the claim text.