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US 10,473,020 B2Granted
Method and system for exhaust aftertreatment
AssigneeFord Global Technologies, LLC
InventorXiaogang Zhang
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for reducing engine emissions using a branched exhaust system. In one example, a branched exhaust system may include a plurality of sub-branches each housing a distinct exhaust component, and an order of exhaust flow through each of the exhaust components may be adjusted based on engine operating conditions and temperature demand of the distinct components.
Claims19
A method for an engine comprising:
- adjusting a plurality of valves coupled to each of a first, second, third, and fourth sub-branch of a branched exhaust system, each sub-branch arranged parallel to a main exhaust passage and housing a distinct exhaust component;
- and
- varying an order of exhaust flow through the distinct exhaust components based on a temperature, wherein each of the plurality of valves is adjustable to one of a first position, a second position, and a third position intermediate to the first and second positions.
An exhaust system comprising:
- a main exhaust passage;
- a branched exhaust assembly with a first peripheral branch and a second peripheral branch branching from the main exhaust passage;
- a first sub-branch, a second sub-branch, and a fifth central sub-branch branching from the first peripheral branch;
- a third sub-branch, a fourth sub-branch, and a sixth central sub-branch branching from the second peripheral branch;
- wherein each of the first sub-branch, the second sub-branch, and the fifth central sub-branch are positioned on a first side of the main exhaust passage, and each of the third sub-branch, the fourth sub-branch, and the sixth central sub-branch are positioned on a second side of the main exhaust passage, the first side opposite to the second side.
2 more elements
An engine system comprising:
- an intake manifold;
- an exhaust manifold;
- a branched exhaust assembly with a first peripheral branch comprising a first sub-branch and a second sub-branch, and a second peripheral branch comprising a third sub-branch and a fourth sub-branch;
- a first four-way valve coupled to the exhaust manifold upstream of each of the first peripheral branch and the second peripheral branch;
- a second four-way valve coupled to a first end of the first peripheral branch, and a third four-way valve coupled to a second end of the first peripheral branch;
- a fourth four-way valve coupled to a first end of the second peripheral branch, and a fifth four-way valve coupled to a second end of the second peripheral branch;
- a turbine coupled to the first sub-branch;
- a diesel oxidation catalyst (DOC) coupled to the second sub-branch;
- a diesel particulate filter (DPF) coupled to the third sub-branch;
- a selective catalytic reduction (SCR) catalyst coupled to the fourth sub-branch;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- inferring temperature demand of each of the turbine, the DOC, the DPF, and the SCR catalyst, based on one or more of desired boost, engine temperature, DPF soot loading, and SCR catalyst NOx loading;
- and
- when the turbine temperature demand is higher than the DOC temperature demand, actuating each of the first four-way valve, the second four-way valve, and the third four-way valve to flow exhaust first through the turbine, and, when the DPF temperature demand is higher than the SCR catalyst temperature demand, actuating each of the first four-way valve, the fourth four-way valve, and the fifth four-way valve to flow exhaust first through the DPF.
12 more elements
Dependencies are inferred from the claim text.