Two-phase fuel emission system for spark ignited engine
AssigneeKia Motors Corporation
InventorsChung M. Suh, Jeong J. Park
Life of this patent
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Abstract
An internal combustion engine having a pollution control system with a catalytic converter using a two-phase fuel system in which a small supply of flammable gaseous fuel is used for ignition and initial start-up of the engine. As the engine is warmed up and the catalytic converter is heated, the gaseous fuel is phased out and the liquid fuel is phased in.
Claims8
A method of reducing polluting emissions in an internal combustion engine during warm-up, wherein the internal combustion engine is fueled by a supply of liquid fuel during operation after warm-up comprising the steps of:
- a) providing an auxiliary supply of a clean burning gaseous fuel;
- b) exclusively supplying the gaseous fuel to the engine on engine start-up, so that the gaseous fuel comprises all of the fuel during start-up;
- c) phasing in the supply of liquid fuel after engine start-up and during warm-up wherein both gaseous fuel and liquid fuel are supplied to the engine;
- d) concurrent with the phasing in of liquid fuel after engine start-up and during warm-up, phasing out the supply of gaseous fuel to the engine.
In an internal combustion engine having a combustion chamber and a liquid fuel supply for operation of the engine and a pollution control system including a catalytic converter for controlling polluting emissions from the engine, a secondary fuel system for use during engine start-up and warm-up comprising:
- a small supply of gaseous fuel, and a fuel supply control means for supplying gaseous fuel to the engine from the small supply of gaseous fuel during engine start-up, wherein the fuel supply control means includes regulating means for subsequently phasing in a supply of liquid fuel after ignition and during warm-up, and phasing out the gaseous fuel upon heating of the catalytic converter wherein during warm-up both gaseous fuel and liquid fuel are supplied to the engine.
Dependencies are inferred from the claim text.