ENGINE EXHAUST GAS TREATMENT DEVICE INCLUDING ELECTRICALLY ACTUATED HYDROCARBON ADSORBER BYPASS VALVE

摘要

An engine exhaust gas treatment device may include a housing, a hydrocarbon adsorber, an adsorber bypass passage, and a bypass valve assembly. The hydrocarbon adsorber may be located within the housing and may define a first flow path between an exhaust gas inlet and an exhaust gas outlet of the housing. The adsorber bypass passage may define a second flow path between the exhaust gas inlet and the exhaust gas outlet. The bypass valve assembly may include a bypass valve and an electric actuation mechanism engaged with the bypass valve. The bypass valve may be displaceable between open and closed positions by the electric actuation mechanism.