Emission control device
First Claim
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1. A system comprising:
- an engine having a bank of cylinders; and
an emission control device in an upstream position coupled to at least a first and second cylinder on said bank, said emission control device having a first path for treating exhaust from said first cylinder, and a second path for treating exhaust from said second cylinder, said first and second paths being separated at least through a portion along a path of flow of said emission control device.
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Abstract
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
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Citations
22 Claims
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1. A system comprising:
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an engine having a bank of cylinders; and
an emission control device in an upstream position coupled to at least a first and second cylinder on said bank, said emission control device having a first path for treating exhaust from said first cylinder, and a second path for treating exhaust from said second cylinder, said first and second paths being separated at least through a portion along a path of flow of said emission control device. - View Dependent Claims (2, 3, 4)
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5. A system comprising:
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an engine having a first and second bank of cylinders, said first bank having a first and second group of cylinders, said second bank having a third and fourth group of cylinders;
a first emission control device coupled to said first and second group for treating gasses from said first and second group separately;
a second emission control device coupled to said third and fourth group for treating gasses from said third and fourth group separately; and
a controller for operating said first and third group about stoichiometry and said second and fourth group to pump air without injected fuel. - View Dependent Claims (6, 7, 8, 9)
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10. An emission control device for treating exhaust gasses of a vehicle'"'"'s internal combustion engine, comprising:
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a substrate material having a washcoat thereon including at least one precious metal;
a first passageway coupled to one end of said substrate to pass a first gas stream to a first side of the device; and
a second passageway coupled to said one end of said substrate to pass a second gas stream to a second side the device, said first and second passageways preventing mixing of said first and second gas stream before contacting said substrate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for treating exhaust gasses produced by an internal combustion engine of a vehicle, the gasses treated at least by an emission control device, the method comprising:
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passing a first exhaust gas stream to a first portion of the device;
passing a second exhaust gas stream to a second portion of the device, said first and second exhaust gas stream prevented from mixing before being at least partially treated by said device; and
passing a mixture of said first and second streams exiting said device to a downstream emission control device. - View Dependent Claims (19, 20, 21, 22)
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Specification