Powertrain with Continuously Variable Transmission and Aftertreatment System

A method of operating a powertrain to regulate temperature of a selective catalytic reduction (SCR) catalyst comprising:

• measuring a catalyst temperature of an SCR catalyst disposed in an exhaust system operatively associated with an internal combustion engine;
• regulating an engine speed of the internal combustion engine in an inverse relation to the catalyst temperature;
• and
• regulating a CVT output of a continuously variable transmission (CVT) operatively coupled to the internal combustion engine in a direct relation to the catalyst temperature.

A powertrain for a machine comprising:

• an internal combustion engine including a plurality of combustion chambers for the combustion of a fuel;
• an exhaust system in fluid communication with the plurality of combustion chambers to receive and direct away exhaust gases from the internal combustion engine;
• a selective catalytic reduction (SCR) catalyst disposed in the exhaust system to reduce nitrogen oxides (NOx) in the exhaust gases to nitrogen (N2) and water (H2O);
• a continuously variable transmission operatively (CVT) coupled to a driveshaft of the internal combustion engine;
• and
• an electronic controller operative associated with the internal combustion engine and the CVT and configured receive and compare the catalyst temperature to the catalytic threshold, the electronic controller further configured to increase an engine speed and restrict a CVT output if the catalyst temperature is below the catalytic threshold.