Patent ID: 6932063
Filing Date: 2005-08-23
Classification: F02D,F02F,F02M,Y02T

Abstract:
1. A method of limiting NOx emissions from a compression ignition diesel internal combustion engine, comprising: opening an intake valve of a cylinder of the engine during an exhaust stoke of the cylinder to release exhaust gas from the engine to an intake manifold for the engine; actively cooling the exhaust within the intake manifold; and drawing the exhaust back into the engine; wherein active cooling is cooling going beyond the cooling that results from warming the intake manifold, mixing of the exhaust with intake air, and heat loss to the surroundings in the absence of specific structures to promote heat transfer; and the exhaust has a convention diesel engine exhaust composition in the sense that the exhaust does not have a composition that could cause pre-ignition prior to fuel injection, even in the absence of cooling.