Patent ID: 6934622

Claim:
An internal combustion engine with a plurality of cylinders, the engine including an intake manifold and an exhaust manifold, the engine further comprising: a first exhaust path for receiving and routing exhaust gases; a first NO x adsorber located in the first exhaust path; a second exhaust path for receiving and routing exhaust gases; a flow control valve between the exhaust manifold and the first and second exhaust paths for controlling the relative amounts of exhaust gas flowing through the first and second exhaust paths; and a first injector for injecting a reductant into the exhaust gas stream, the first injector being located so as to inject the reductant at a location immediately adjacent to the flow control valve; wherein there is a pressure drop across the flow control valve that results in turbulent flow in a region immediately adjacent to the flow control valve that includes the reductant injection location, thereby causing mixing of the reductant and the exhaust gas in a relatively short distance and to allow regeneration of the first NO x adsorber.