| 摘要 |
An exhaust gas aftertreatment device for an internal combustion engine comprises an inlet configured to receive the exhaust gas, an outlet from which the exhaust gas exits the device, a first passageway defined between the inlet and the outlet, and a second passageway defined between the inlet and the outlet, wherein the second passageway is separate from the first passageway. A first aftertreatment element is disposed in the first passageway. In one embodiment, the device is a diesel oxidation catalyst device and the second passageway represents a bypass passageway. The second passageway may further have a second aftertreatment element disposed therein. In an alternative embodiment, the device is a NOx aftertreatment element, and a second aftertreatment element is disposed in the second passageway. In either case, the device includes an exhaust gas flow control mechanism configured to selectively control exhaust gas flow through the first and second passageways.
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