Exhaust aftertreatment system for an internal combustion engine and method for operating same
First Claim
1. An exhaust aftertreatment system for an engine, comprising:
- an exhaust valve assembly having a first port, a second port, and a third port, the exhaust valve assembly being configured to effect selective fluid communication between the first port, the second port, and the third port;
an exhaust conduit fluidly coupled to an exhaust port of the engine and fluidly coupled to the first port of the exhaust valve assembly;
an exhaust aftertreatment device fluidly coupled to the second port of the exhaust valve assembly;
a bypass conduit fluidly coupled to the third port of the exhaust valve assembly, the bypass conduit configured to bypass a flow of exhaust around the exhaust aftertreatment device;
a reductant supply in selective fluid communication with the exhaust conduit; and
a controller operatively coupled to the exhaust valve assembly, the reductant supply, and the engine, the controller being configured to regenerate the exhaust aftertreatment device according to a first regeneration procedure when the engine operates in a substantially non-premixed mode, the first regeneration procedure includingdelivering a first flow of reductant from the reductant supply to the exhaust aftertreatment device,effecting fluid communication between the first port and the second port, andblocking fluid communication between the first port and the third port.
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Accused Products
Abstract
An exhaust aftertreatment system for an engine includes an exhaust valve assembly having a first port, a second port, and a third port, the exhaust valve assembly being configured to effect selective fluid communication between the first port, the second port, and the third port; an exhaust conduit fluidly coupled to an exhaust port of the engine and fluidly coupled to the first port of the exhaust valve assembly; an exhaust aftertreatment device fluidly coupled to the second port of the exhaust valve assembly; a bypass conduit fluidly coupled to the third port of the exhaust valve assembly, the bypass conduit configured to bypass a flow of exhaust around the exhaust aftertreatment device; a reductant supply in selective fluid communication with the exhaust conduit; and a controller operatively coupled to the exhaust valve assembly and the reductant supply.
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Citations
20 Claims
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1. An exhaust aftertreatment system for an engine, comprising:
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an exhaust valve assembly having a first port, a second port, and a third port, the exhaust valve assembly being configured to effect selective fluid communication between the first port, the second port, and the third port; an exhaust conduit fluidly coupled to an exhaust port of the engine and fluidly coupled to the first port of the exhaust valve assembly; an exhaust aftertreatment device fluidly coupled to the second port of the exhaust valve assembly; a bypass conduit fluidly coupled to the third port of the exhaust valve assembly, the bypass conduit configured to bypass a flow of exhaust around the exhaust aftertreatment device; a reductant supply in selective fluid communication with the exhaust conduit; and a controller operatively coupled to the exhaust valve assembly, the reductant supply, and the engine, the controller being configured to regenerate the exhaust aftertreatment device according to a first regeneration procedure when the engine operates in a substantially non-premixed mode, the first regeneration procedure including delivering a first flow of reductant from the reductant supply to the exhaust aftertreatment device, effecting fluid communication between the first port and the second port, and blocking fluid communication between the first port and the third port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for operating an exhaust gas aftertreatment system for an engine, the exhaust gas aftertreatment system including:
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an exhaust valve assembly having a first port, a second port, and a third port, the exhaust valve assembly being configured to effect selective fluid communication between the first port, the second port, and the third port, an exhaust conduit fluidly coupled to an exhaust port of the engine and fluidly coupled to the first port of the exhaust valve assembly, an exhaust aftertreatment device fluidly coupled to the second port of the exhaust valve assembly, a bypass conduit fluidly coupled to the third port of the exhaust valve assembly, the bypass conduit configured to bypass a flow of exhaust around the exhaust aftertreatment device; and a reductant supply in selective fluid communication with the exhaust conduit, the method comprising; receiving a flow of exhaust gas at the first port of an exhaust valve assembly; operating the engine in a substantially non-premixed mode; and regenerating the exhaust aftertreatment device while the engine operates in the substantially non-premixed mode according to a first regeneration procedure, including delivering a flow of reductant from the reductant supply to the exhaust aftertreatment device, effecting fluid communication between the first port and the second port, and blocking fluid communication between the first port and the third port.
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17. An exhaust aftertreatment system, comprising:
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a first housing; a second housing in fluid communication with the first housing via a crossover duct; an upstream aftertreatment device disposed in the first housing; an exhaust valve assembly disposed downstream of the upstream aftertreatment device and upstream of the crossover duct in a direction of exhaust flow through the exhaust aftertreatment system; a downstream aftertreatment device disposed in the second housing; and a bypass duct in fluid communication with the exhaust valve assembly and an outlet of the second housing, wherein; the exhaust valve assembly includes a first port, a second port, and a third port, the first port is fluidly coupled with an outlet of the upstream aftertreatment device, the second port is fluidly coupled with the second housing via the crossover duct, a first configuration of the exhaust valve assembly effects fluid communication between the first port and the second port, and blocks fluid communication between the first port and the third port, and a second configuration of the exhaust valve assembly blocks fluid communication between the first port and the second port, and effects fluid communication between the first port and the third port. - View Dependent Claims (18, 19, 20)
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Specification