Controls for vehicle systems including SCR exhaust aftertreatment and neutral at stop capability

A vehicle system comprising:

• an engine;
• a transmission including a torque converter configured to receive torque from the engine and an electronically controllable clutch configured to selectably couple and decouple the torque converter and a gearset;
• a selective catalytic reduction (SCR) exhaust aftertreatment system configured to receive exhaust from the engine;
• and
• an electronic control system in operative communication with the engine, the electronically controllable clutch, and the SCR exhaust aftertreatment system, the electronic control system being configured to:
• evaluate whether an SCR catalyst temperature satisfies at least one minimum temperature criterion by being one of greater than and greater than or equal to the at least one minimum temperature criterion,
• in response to the SCR catalyst temperature satisfying the minimum temperature criterion, permit a neutral at stop operation wherein the electronically controllable clutch is controlled to selectably decouple the torque converter and the one or more gears at least in part in response to the vehicle system being in a stopped state, and
• in response to the SCR catalyst temperature not satisfying the minimum temperature criterion, prevent the neutral at stop operation.