Gaseous-Fuelled Stoichiometric Compression Ignition Internal Combustion Engine
First Claim
1. A method for operating a gaseous-fuelled stoichiometric internal combustion engine comprising:
- (a) determining by mass an amount of pilot fuel as a function of detected engine operating conditions;
(b) determining by mass an amount of gaseous fuel to introduce into a combustion chamber as a function of detected engine load and based on a total energy desired minus energy associated with said amount of pilot fuel;
(c) determining by mass an amount of exhaust gas recirculation from an engine exhaust system to an intake air system as a function of at least one of said engine load and/or another engine operating condition;
(d) determining an amount of air required for stoichiometric combustion as a function of said amount of pilot fuel, said amount of gaseous fuel and said amount of exhaust gas recirculation;
(e) controlling an exhaust gas recirculation system to direct a portion of said amount of recirculated exhaust gas through a cooler and then to said intake air system;
(f) controlling a pilot fuel injector to inject said amount of pilot fuel directly into said combustion chamber;
(g) controlling a gaseous fuel injector to introduce said amount of gaseous fuel into said combustion chamber where it forms a substantially homogenous mixture with said air and said recirculated exhaust gas;
(h) controlling said intake air system to introduce said amount of air into said combustion chamber; and
(i) igniting said pilot fuel by compressing an intake charge comprising said pilot fuel, said gaseous fuel, said intake air and said recirculated exhaust gas, whereby the combustion of said pilot fuel triggers the ignition and stoichiometric combustion of said gaseous fuel.
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Accused Products
Abstract
In a gaseous-fuelled stoichiometric compression ignition internal combustion engine, a pilot fuel is injected directly into the combustion chamber to help initiate a multi-point ignition. The engine provides performance improvements approaching those of high pressure direct injection engines but with less complexity because the gaseous fuel is introduced into the intake air subsystem at relatively low pressure and as a result of the stoichiometric combustion, the low oxygen content in the combustion products exiting the combustion chamber allows the use of a three-way catalyst instead of other after treatment arrangements normally associated with conventional compression ignition engines that require the addition of a reductant.
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Citations
35 Claims
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1. A method for operating a gaseous-fuelled stoichiometric internal combustion engine comprising:
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(a) determining by mass an amount of pilot fuel as a function of detected engine operating conditions; (b) determining by mass an amount of gaseous fuel to introduce into a combustion chamber as a function of detected engine load and based on a total energy desired minus energy associated with said amount of pilot fuel; (c) determining by mass an amount of exhaust gas recirculation from an engine exhaust system to an intake air system as a function of at least one of said engine load and/or another engine operating condition; (d) determining an amount of air required for stoichiometric combustion as a function of said amount of pilot fuel, said amount of gaseous fuel and said amount of exhaust gas recirculation; (e) controlling an exhaust gas recirculation system to direct a portion of said amount of recirculated exhaust gas through a cooler and then to said intake air system; (f) controlling a pilot fuel injector to inject said amount of pilot fuel directly into said combustion chamber; (g) controlling a gaseous fuel injector to introduce said amount of gaseous fuel into said combustion chamber where it forms a substantially homogenous mixture with said air and said recirculated exhaust gas; (h) controlling said intake air system to introduce said amount of air into said combustion chamber; and (i) igniting said pilot fuel by compressing an intake charge comprising said pilot fuel, said gaseous fuel, said intake air and said recirculated exhaust gas, whereby the combustion of said pilot fuel triggers the ignition and stoichiometric combustion of said gaseous fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 34, 35)
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20. A gaseous-fuelled stoichiometric internal combustion engine comprising:
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(a) a combustion chamber; (b) a gaseous fuel injector for introducing an amount of gaseous fuel into said combustion chamber; (c) a pilot fuel injector for introducing an amount of pilot fuel directly into said combustion chamber; (d) an intake air system comprising an intake manifold for introducing an amount of air into said combustion chamber; (e) an exhaust gas system comprising an exhaust gas line in communication with said combustion chamber; (f) an exhaust gas recirculation system for recirculating an amount of exhaust gas from said exhaust gas system to said intake air system, said exhaust gas recirculation system comprising a cooler for cooling recirculated exhaust gas before delivering it to said air intake system; and (g) an engine controller programmed to control said gaseous fuel injector, said pilot fuel injector, said intake air system and said exhaust gas recirculation system to provide a stoichiometric oxygen/fuel ratio during normal operation of said engine, whereby said pilot fuel is ignited by compressing an intake charge comprising said pilot fuel, said gaseous fuel, said intake air and said recirculated exhaust gas, and combustion of said pilot fuel triggers ignition and stoichiometric combustion of said gaseous fuel. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification