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Fast Warm-Up of Diesel Aftertreatment System During Cold Start

Abstract: 

Intake air is severely restricted during cold start of a diesel engine to provide high engine-out exhaust gas temperatures and quickly heat exhaust treatment devices. Cylinder pressures are maintained substantially below the pressure of the ambient atmosphere during a principal portion of the intake stroke of each combustion cycle to promote rapid fuel vaporization and higher combustion temperatures. The engine is operated in a premixed charge compression ignition combustion mode to provide a high engine-out exhaust temperature, stable combustion, and low emissions during the cold start period.

Patent Number: 
7,261,086
Date Of Issue: 
08/28/2007
Inventors: 

Yiqun Huang