Operation of an internal combustion engine

Details Operation of an internal combustion engine Operation of an internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F01N 3/20 (2006.01) F01N 3/18 (2006.01) F01N 3/22 (2006.01) F01N 3/28 (2006.01) F02D 41/14 (2006.01) F01N 13/02 (2010.01) F01N 7/02 (2006.01)

Patent

CA 2111240

2111240 9222734 PCTABScor01 A method is described for reducing the total emissions during cold starts from an engine burning a hydrocarbon fuel and having an afterburner arranged upstream of a catalytic converter. The method comprises the steps of: (i) adding an excess of fuel to the engine combustible charge and adding air to the engine exhaust gases immediately after the engine has first fired to assure the presence in the exhaust/air mixture of sufficient concentrations of hydrogen and oxygen to permit the resulting exhaust/air mixture to be ignitiable and to burn with a steady flame in the afterburner while the latter is at a temperature close to the ambient temperature, and (ii) igniting the exhaust/air mixture in the afterburner immediately after the engine has first fired. In the preferred embodiment of the invention, the excess fuel and/or the additional air are regulated after ignition has occurred in the afterburner to maintain a steady flame in the afterburner until at least part of the matrix of the catalytic converter has reached its light off temperature.

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