Patent ID: 8434295

Claim:
A system comprising: a diesel engine having a combustion chamber with an intake valve for passing air into the combustion chamber; an aftertreatment device configured to operate within a desired operating-temperature range and to treat emissions from the engine; a sensor responsive to a temperature of the aftertreatment device; and a controller operatively coupled to the sensor and to the intake valve, the controller including a processor and memory with executable instructions stored therein, the instructions causing the controller to: command an early homogenization combustion in the combustion chamber at a first intake-valve closure timing; receive an output of the sensor; and when the output of the sensor corresponds to an aftertreatment-device temperature below the desired operating-temperature range, to command a second combustion in the combustion chamber at a second intake-valve closure timing, later than the first, to reduce a volumetric air-flow efficiency of the engine.