Constant EGR rate engine and method
First Claim
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1. An internal combustion engine, comprising:
- a first exhaust manifold;
a second exhaust manifold fluidly connected to the first exhaust manifold through an exhaust valve;
an intake manifold in constant fluid communication with the second exhaust manifold;
an exhaust gas recirculation (EGR) cooler disposed between the second exhaust manifold and the intake manifold; and
a turbocharger having a turbine in fluid communication with the first exhaust manifold, and a compressor in fluid communication with a supercharger;
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Abstract
An internal combustion engine (100) includes a first exhaust manifold (120), and a second exhaust manifold (118) fluidly connected to the first exhaust manifold (120) through an exhaust valve (122). An exhaust gas recirculation (EGR) cooler (124) constantly fluidly connects the second exhaust manifold (118) with an intake manifold (112). A turbocharger (102) has a turbine (126) in fluid communication with the first exhaust manifold (120), and a compressor (132) in fluid communication with a supercharger (140). A charge air cooler (150) fluidly connects the supercharger (140) with the intake manifold (112).
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Citations
20 Claims
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1. An internal combustion engine, comprising:
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a first exhaust manifold;
a second exhaust manifold fluidly connected to the first exhaust manifold through an exhaust valve;
an intake manifold in constant fluid communication with the second exhaust manifold;
an exhaust gas recirculation (EGR) cooler disposed between the second exhaust manifold and the intake manifold; and
a turbocharger having a turbine in fluid communication with the first exhaust manifold, and a compressor in fluid communication with a supercharger;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising the steps of:
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dividing an exhaust flow of an engine into a first portion and a second portion;
passing the first portion through a turbocharger;
recirculating the second portion to an intake system through an exhaust gas recirculation cooler;
compressing intake air in a compressor; and
supercharging intake air in a supercharger. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for an internal combustion engine, comprising the steps of:
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recirculating a substantially constant percentage of exhaust flow from an exhaust system of the engine into an intake system of the engine;
controlling a boost pressure of the engine with a supercharger having a bypass valve;
cooling an intake air flow using at least one of an inter-stage cooler disposed between the supercharger and a turbo-compressor and a charge air cooler disposed between the supercharger and the intake system;
controlling an exhaust pressure of the engine using at least one of a variable geometry turbine and a turbine waste-gate valve. - View Dependent Claims (20)
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Specification