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US 10,054,083 B2Granted
Internal combustion engine having six cylinders with two of the cylinders being dedicated EGR cylinders controlled with dual EGR valve
AssigneeSouthwest Research Institute
InventorsMartin Selway, Ian Paul Gilbert, Marc C. Megel
Life of this patent
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Abstract
An exhaust gas recirculation (EGR) system for an internal combustion engine having two dedicated EGR cylinders. A dual valve system is used to control the output of the dedicated EGR cylinders so that the engine may intake EGR exhaust from both, only one, or neither of the dedicated EGR cylinders.
Claims19
An exhaust gas recirculation system for an internal combustion engine, the internal combustion engine having a high pressure EGR loop and a main exhaust line, comprising:
- a first dedicated EGR cylinder;
- a second dedicated EGR cylinder;
- wherein the first dedicated EGR cylinder and the second dedicated EGR cylinder are the only cylinders of the internal combustion engine that provide recirculated exhaust to the internal combustion engine;
- a dual valve system comprising:
- a housing for containing the dual valve system, wherein the housing has a first input port for receiving exhaust from the first dedicated EGR cylinder, a second input port for receiving exhaust from the second dedicated EGR cylinder, an exhaust outlet to the main exhaust line, and an EGR outlet to the high pressure EGR loop;
- wherein the housing only receives exhaust from the first dedicated EGR cylinder and the second dedicated EGR cylinder;
- a first EGR input connection line;
- a second EGR input connection line;
- a first three-way valve having one input from the first EGR input connection line and two outputs;
- a second three-way valve having one input from the second EGR input connection line and two outputs;
- a first internal cross-flow line providing fluid flow from one of the two outputs of the first three-way valve to the EGR outlet;
- a second internal cross-flow line providing fluid flow from one of the two outputs of the second three-way valve to a point on the first EGR input connection line upstream of the first three-way valve;
- wherein the first three-way valve is operable to direct exhaust from the first EGR input connection line to either the exhaust outlet or to the first internal cross-flow line;
- and
- wherein the second three-way valve is operable to direct exhaust from the second EGR input connection line to either the second internal cross-flow line or to the EGR outlet.
12 more elements
A method of using an exhaust gas recirculation (EGR) system for an internal combustion engine, the internal combustion engine having a number of cylinders, a high pressure EGR loop and a main exhaust line, the method comprising:
- operating two of the cylinders as dedicated EGR cylinders such that all exhaust from the dedicated EGR cylinders is routed to the high pressure EGR loop or to the main exhaust line and all exhaust from the remaining cylinders is routed to only the main exhaust line;
- receiving exhaust from a first one of the dedicated EGR cylinders into a first input port of a housing of a dual valve system;
- receiving exhaust from a second one of the dedicated EGR cylinders into a second port of the housing of the dual valve system;
- wherein the dual valve system comprises:
- the housing for containing the dual valve system, the housing further having an exhaust outlet to the main exhaust line and an EGR outlet to the high pressure EGR loop;
- a first EGR input connection line;
- a second EGR input connection line;
- a first three-way valve having one input from the first EGR input connection line and two outputs;
- a second three-way valve having one input from the second EGR input connection line and two outputs;
- a first internal cross-flow line providing fluid flow from one of the two outputs of the first three-way valve to the EGR outlet;
- and a second internal cross-flow line providing fluid flow from one of the two outputs of the second three-way valve to a point on the first EGR input connection line downstream of the first three-way valve;
- operating the first three-way valve to direct exhaust from the first EGR input connection line to either the exhaust outlet or to the first internal cross-flow line;
- and
- operating the second three-way valve to direct exhaust from the second EGR input connection line to either the second internal cross-flow line or to the EGR outlet.
11 more elements
Dependencies are inferred from the claim text.