System, method, and apparatus for managing aftertreatment temperature

A method, comprising:

• interpreting an aftertreatment indicating temperature;
• determining that an engine fueling requirement is zero;
• and
• performing a reduced air flow operation through the engine in response to the aftertreatment indicating temperature falling below a first threshold value and in response to the engine fueling requirement being zero, wherein the engine comprises a portion of a vehicle powertrain.

A system comprising:

• an engine fluidly coupled to an aftertreatment system, the engine further being engaged to a transmission, wherein the engine and the transmission comprise a portion of a vehicle powertrain;
• a controller configured to interpret an aftertreatment indicating temperature of the aftertreatment system and determine that an engine fueling requirement is zero, wherein the controller is further configured to perform one or more of:
• disengaging the engine from the transmission in response to the aftertreatment indicating temperature falling below a first threshold value and in response to the engine fueling requirement being zero;
• and
• performing a reduced air flow operation through the engine in response to the aftertreatment indicating temperature falling below a first threshold value and in response to the engine fueling requirement being zero.

A system, comprising:

• an engine and a transmission comprising a portion of a powertrain for a vehicle;
• the engine having a compression braking system and an exhaust gas recirculation system;
• a controller configured to interpret a compression braking event and to provide a braking exhaust gas recirculation fraction command in response to the compression braking event, wherein the exhaust gas recirculation fraction command is greater than a combustion exhaust gas recirculation fraction command;
• and
• wherein the exhaust gas recirculation system is responsive to the braking exhaust gas recirculation fraction command.