Crankcase blow-by gas treatment assembly and method of treating blow-by gas

A blow-by treatment assembly for a vehicle having an engine emitting blow-by gas from a gap between a piston ring and a cylinder wall, the engine having a crankcase emitting the blow-by gas, the blow-by treatment assembly comprising:

• a duct for receiving blow-by gas from the crankcase of the engine, the duct in fluid communication with the crankcase;
• a mist separator in fluid communication with the duct, the mist separator in downstream fluid communication from the crankcase;
• a catalyst trap disposed in fluid communication with the duct and located in downstream fluid communication with the mist separator, the catalyst trap comprising a hydrocarbon trap for trapping at least a portion of the hydrocarbons in the blow-by gas not removed by the mist separator upstream from and adjacent to a diesel oxidation catalyst having a heating element for bringing the diesel oxidation catalyst to a light off temperature so that the hydrocarbon trap does not achieve a temperature where the stored hydrocarbons on the hydrocarbon trap physically evolve before the diesel oxidation catalyst has achieved the light off temperature necessary to burn the stored hydrocarbons
• a pump for pumping the blow-by gas through the catalyst trap, wherein the pump is downstream of the crankcase, wherein the blow-by gas is not combined with exhaust gas from the engine before treatment;
• and
• an outlet in fluid communication with the catalyst trap for emitting the blow-by gas to one of an ambient and a tailpipe.