Hydrogen fueled spark ignition engine
AssigneeFord Global Technologies, LLC
InventorsXiaoguo Tang, Joseph Robert Theis, Robert Jay Natkin, Siamak Hashemi, William F. Stockhausen
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Abstract
A hydrogen fueled reciprocating spark ignition engine includes a fuel system for providing gaseous hydrogen to the cylinders of the engine and a lean NOx trap coupled to the engine for treating the engine's exhaust. An EGR system provides recirculated exhaust gas to the engine, and a controller operates the fuel system and EGR system during periodic purging of the lean NOx trap such that the engine is operated fuel rich, with the mass of EGR approximating 40%-80% of the mass of air and fuel.
Claims21
A hydrogen fueled reciprocating spark ignition engine, comprising:
- a fuel system for providing gaseous hydrogen to the cylinders of the engine;
- a lean NOx trap coupled to the engine for treating the engine's exhaust;
- an EGR system for providing recirculated exhaust gas to the engine;
- and
- a controller for operating the fuel system and the EGR system during periodic purging of the lean NOx trap such that the engine is operated at a richer-than-stoichiometric air/fuel ratio, and with the mass of EGR approximating 40-80% of the mass of air and fuel.
A method for operating a reciprocating internal combustion engine equipped with a lean NOx trap on gaseous hydrogen, comprising the steps of:
- operating the engine at an equivalence ratio of about 0.15 to 0.65, except when purging the lean NOx trap;
- and
- operating at an equivalence ratio of about 1.1 when purging the lean NOx trap.
A method for operating a reciprocating internal combustion engine, comprising the steps of:
- providing substantially premixed air and hydrogen to a combustion chamber of the engine wherein said air and hydrogen are at an equivalence ratio of approximately unity;
- and
- providing residual gases to the combustion chamber, with the mass of the residual gases exceeding 40% of the total mass of gases provide to the combustion chamber.
Dependencies are inferred from the claim text.