Exhaust system and method of operating the same

Abstract

A system includes an exhaust discharge line, first and second junctions, an after-treatment system, an exhaust recirculation line, a pressurized exhaust storage tank, first, second, and third control valves, and an Electronic Control Unit (ECU). The first and second junctions are disposed along the exhaust discharge line, and the control valves are disposed in the exhaust discharge line or the exhaust recirculation line. The ECU is communicatively coupled to the after-treatment system and the control valves. The ECU executes a filling phase by opening or closing the valves to accumulate a portion of the exhaust gases in the storage tank. The ECU ends the filling phase when the tank pressure exceeds a predetermined pressure threshold. The ECU opens the third control valve to release the portion of exhaust gases in response to a determination that the temperature of the catalytic converter exceeds a light-off temperature of the catalytic converter.