Exhaust system for fire fighting vehicle

An exhaust aftertreatment system for a vehicle, the exhaust aftertreatment system comprising:

• a first housing including a first housing inlet configured to be fluidly coupled with an engine of the vehicle and configured to receive exhaust gas from the engine;
• a diesel oxidation catalyst (DOC) disposed within the first housing, the DOC configured to receive the exhaust gas from the first housing inlet;
• a diesel particulate filter (DPF) disposed within the first housing, the DPF configured to receive the exhaust gas from the DOC;
• a second housing including a second housing inlet configured to receive the exhaust gas from the first housing;
• a selective catalytic reduction catalyst (SCR) disposed within the second housing, the SCR configured to receive the exhaust gas from the second housing inlet;
• an intermediate pipe fluidly coupling the first housing with the second housing;
• and
• a thermal management system including:
• a first heater coupled with the first housing;
• a second heater coupled with the second housing;
• and
• a heater control unit electrically coupled with the first heater and the second heater, the heater control unit configured to supply power to the first heater and the second heater.

A fire fighting vehicle comprising:

• a chassis;
• an engine supported by the chassis and configured to produce exhaust gas;
• a pump system;
• and
• an exhaust aftertreatment system including:
• a first housing including a first housing inlet fluidly coupled with the engine and configured to receive the exhaust gas;
• a diesel oxidation catalyst (DOC) disposed within the first housing, the DOC positioned to receive the exhaust gas from the first housing inlet;
• a diesel particulate filter (DPF) disposed within the first housing, the DPF positioned to receive the exhaust gas from the DOC;
• a second housing including a second housing inlet configured to receive the exhaust gas from the first housing;
• a selective catalytic reduction catalyst (SCR) disposed within the second housing, the SCR positioned to receive the exhaust gas from the second housing inlet;
• and
• a thermal management system including:
• a heater coupled with at least one of the first housing or the second housing;
• and
• a heater control unit electrically coupled with the heater and configured to supply power to the heater;
• wherein the heater control unit is positioned laterally between a first frame rail and a second frame rail of the chassis;
• and
• wherein the heater control unit at least one of:
• extends at least partially above the chassis;
• is positioned at least partially below a top surface of the chassis;
• is positioned at least partially under the pump system;
• or
• is positioned at least partially rearward of the pump system.