Use of different pneumatic cylinder spring types in a variable displacement engine for engine and aftertreatment system temperature control

A vehicle, comprising:

• an internal combustion engine (ICE);
• an aftertreatment system fluidly coupled to the ICE;
• a controller configured to control operation of the ICE, the controller configured to:
• detect a cold start of the ICE;
• operate some skipped cylinder firing opportunities of the ICE as a first pneumatic cylinder spring until the aftertreatment system has reached a first threshold temperature;
• and
• operate other skipped cylinder firing opportunities as a second pneumatic cylinder spring until the ICE has reached a second threshold temperature.

A vehicle, comprising:

• a variable displacement internal combustion engine having a plurality of working chambers that operate on a working cycle basis, each working chamber having an intake valve and an exhaust valve;
• a controller configured to control operation of the variable displacement internal combustion engine, the controller configured to:
• operate the internal combustion engine at less than full displacement following a cold start of the variable displacement internal combustion engine;
• ascertain a temperature of an aftertreatment system fluidly coupled to the exhaust valves of the plurality of working chambers;
• while the variable displacement internal combustion engine is operating at less than the full displacement, operate some working cycles that are skipped as a first pneumatic cylinder spring based at least in part on the ascertained temperature of the aftertreatment system;
• and
• while the variable displacement internal combustion engine is operating at less than the full displacement, operate other working cycles that are skipped as a second pneumatic cylinder spring based at least in part on an ascertained temperature of the variable displacement internal combustion engine.