EXHAUST GAS RECIRCULATION METHODS AND APPARATUS FOR REDUCING NOx EMISSIONS FROM INTERNAL COMBUSTION ENGINES
First Claim
Patent Images
1. :
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
during a cycle of said engine;
(a) directing an intake charge from an intake line into a combustion chamber of said internal combustion engine,(b) compressing said intake charge within said combustion chamber,(c) injecting a directly injected gaseous fuel into said compressed intake charge within said combustion chamber at a pressure above 12 MPa,(d) igniting said directly injected gaseous fuel,(e) burning said directly injected gaseous fuel,(f) directing exhaust gas produced during burning of said directly injected gaseous fuel from said combustion chamber into an exhaust line,wherein a quantity of said exhaust gas from said exhaust line is directed through an EGR line to said intake line and, during a subsequent cycle of said engine, a subsequent intake charge comprises said quantity of said exhaust gas.
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Abstract
A method of operating an internal combustion engine employs exhaust gas recirculation (EGR) in combination with directly injected gaseous fuels that are burned within the engine in a stratified combustion mode. An engine that employs EGR includes an injector adapted to provide a high pressure quantity of fuel into a combustion chamber within a given pressure range, at a given angle and through a nozzle hole size to help provide for EGR tolerance and, consequently, reduce emissions.
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Citations
44 Claims
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1. :
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
during a cycle of said engine; (a) directing an intake charge from an intake line into a combustion chamber of said internal combustion engine, (b) compressing said intake charge within said combustion chamber, (c) injecting a directly injected gaseous fuel into said compressed intake charge within said combustion chamber at a pressure above 12 MPa, (d) igniting said directly injected gaseous fuel, (e) burning said directly injected gaseous fuel, (f) directing exhaust gas produced during burning of said directly injected gaseous fuel from said combustion chamber into an exhaust line, wherein a quantity of said exhaust gas from said exhaust line is directed through an EGR line to said intake line and, during a subsequent cycle of said engine, a subsequent intake charge comprises said quantity of said exhaust gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
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18-37. -37. (canceled)
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38. :
- An exhaust gas recirculation apparatus for use in a gaseous-fuelled direct injection internal combustion engine, the exhaust gas recirculation apparatus comprising an intake line, an exhaust line and an EGR line for directing a quantity of exhaust gas from said exhaust line through to said intake line, wherein said gaseous fuel is injected into a combustion chamber of said engine at a pressure in excess of 12 MPa.
- View Dependent Claims (39)
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40. :
- An internal combustion engine comprising,
(a) at least one cylinder with a piston, said cylinder and said piston partially defining a combustion chamber, said piston oscillating between top dead center and bottom dead center within said cylinder when said internal combustion engine is operating, (b) a controller processing operational data to create an engine profile, (c) a fuel injector directly injecting a gaseous fuel into said combustion chamber, said injector defining injector nozzle holes of a diameter between 0.6 and 1.0 mm, said injector commanded by said controller, (d) an intake line for introducing a charge into said combustion chamber through an intake valve, (e) an exhaust line for directing exhaust gas resulting from combustion of said gaseous fuel from said combustion chamber through an exhaust valve, and (f) an EGR line connected between said intake line and said exhaust line wherein said controller provides a quantity of said exhaust gas from said exhaust line through said EGR line to said intake line.
- An internal combustion engine comprising,
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41. :
- A method of operating an internal combustion engine, said method comprising;
during a cycle of said engine; (a) directing an intake charge from an intake line into a combustion chamber of said internal combustion engine, (b) compressing said intake charge within said combustion chamber, (c) directly injecting a fuel into said compressed intake charge within said combustion chamber within a parameter range, said range at least one of; (1) a pressure in excess of 12 MPa, and (2) an angle of between 10 and 20 degrees below a fire deck, said fire deck partially defining said combustion chamber, (d) igniting said fuel, (e) burning said fuel, (f) directing exhaust gas produced during combustion of said fuel from said combustion chamber into an exhaust line, (g) directing a quantity of said exhaust gas from said exhaust line through an EGR line to said intake line, wherein, during a subsequent cycle of said engine, a subsequent intake charge comprises said quantity of said exhaust gas.
- A method of operating an internal combustion engine, said method comprising;
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42. :
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
during a cycle of said engine; (a) directing an intake charge from an intake line into a combustion chamber of said internal combustion engine wherein said intake charge is substantially free of a gaseous fuel, (b) compressing said intake charge within said combustion chamber, (c) injecting a directly injected gaseous fuel into said compressed intake charge within said combustion chamber at a pressure in excess of 12 MPa, (d) burning said gaseous fuel in a stratified combustion mode, (e) directing exhaust gas produced during combustion of said gaseous fuel from said combustion chamber into an exhaust line, directing a quantity of said exhaust gas from said exhaust line through an EGR line to said intake line, wherein a subsequent intake charge comprises said quantity of said exhaust gas.
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
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44. :
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
during a cycle of said engine; (a) directing an intake charge from an intake line into a combustion chamber of said internal combustion engine, (b) compressing said intake charge within said combustion chamber, (c) injecting a directly injected gaseous fuel into said compressed intake charge within said combustion chamber at a pressure, (d) igniting said directly injected gaseous fuel, (e) burning said directly injected gaseous fuel, and (e) directing exhaust gas produced during burning of said directly injected gaseous fuel from said combustion chamber into an exhaust line, wherein a quantity of said exhaust gas from said exhaust line is directed through an EGR line to said intake line and, during a subsequent cycle of said engine, a subsequent intake charge comprises said quantity of said exhaust gas.
- A method of operating a gaseous-fuelled internal combustion engine, said method comprising;
Specification