Vehicle engine emission managing system, has exhaust passage coupled to another exhaust passage downstream of emission control device, where one of exhaust passages is provided with hydrocarbon retaining system

摘要

The system has an exhaust passage (35) provided with an emission control device (70), where the passage is provided with a tailpipe of a vehicle. Another exhaust passage (48) is coupled to the exhaust passage (35) downstream of the emission control device, where the exhaust passage (48) is provided with a hydrocarbon retaining system (22). The hydrocarbon retaining system has a vent passage whose portion is positioned adjacent and thermally coupled to a portion of the downstream section of the exhaust passage (35). An independent claim is also included for a method for operating an engine.