Patent ID: 7398644
Filing Date: 2008-07-15
Classification: F01N,F02D

Abstract:
1. In a mechanical apparatus having a diesel engine including a combustion chamber, the mechanical apparatus also having an aftertreatment device configured to treat emissions from the diesel engine and an exhaust valve for passing exhaust out of the combustion chamber, a method of operating the engine, comprising: performing at least one compression ignition combustion in the combustion chamber at a first exhaust valve opening timing; determining a temperature of the aftertreatment device; and if the temperature of the aftertreatment device is equal to or below a preselected temperature threshold associated with a lower temperature limit of an optimal operating temperature range for nitrogen oxide conversion efficiency of the aftertreatment device, then performing at least one combustion in the combustion chamber at a second, earlier exhaust valve opening timing, and performing a first, earlier injection and a second, late injection of fuel into the combustion chamber in a same engine cycle as performing the second, earlier exhaust valve opening timing.