Engine and method for exhaust aftertreatment

A method of increasing parasitic load on an internal combustion engine, comprising:

• injecting a fuel into a combustion chamber of an active cylinder of the internal combustion engine;
• combusting the injected fuel in the combustion chamber of the active cylinder;
• determining that increasing a temperature of an exhaust aftertreatment device is required;
• increasing a parasitic load on the internal combustion engine by performing a first strategy that includes deactivating at least one cylinder;
• determining that the first strategy does not provide a predetermined exhaust temperature;
• and
• further increasing the parasitic load by pulsing a spill valve member of a spill valve of a fuel injector in the deactivated cylinder between a fully closed position and an at least partially open position.

A internal combustion engine, comprising:

• a plurality of cylinders, each of the plurality of cylinders having a combustion chamber;
• a plurality of fuel injectors each configured to inject fuel into a respective combustion chamber, each of the fuel injectors including a spill valve having a spill valve member;
• an aftertreatment device configured to receive exhaust produced by combustion in the plurality of cylinders;
• a sensor configured to measure at least one of an exhaust temperature or a temperature of the aftertreatment device;
• and
• a controller configured to control each of the fuel injectors such that:
• a first fuel injector of the plurality of fuel injectors injects fuel for combustion in an active cylinder of the plurality of cylinders
• a spill valve member of a second fuel injector of the plurality of fuel injectors in a deactivated cylinder of the plurality of cylinders is pulsed between a fully closed position and an at least partially open position;
• and
• the second fuel injector injects fuel into the deactivated cylinder at a timing that avoids combustion of the fuel in the deactivated cylinder.