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US 10,947,881 B2Granted
Reductant generator
AssigneeFaurecia Emissions Control Technologies, USA, LLC
InventorEduardo Alano
Life of this patent
Estimating the term…
Abstract
A reductant generator includes a housing defining a chamber, an inlet to direct engine exhaust gas into the chamber, a moveable member that receives driving input from an engine and which is configured to compress engine exhaust gases within the chamber, and a supply to provide a fluid into the chamber to be transformed into reductant. The generator also includes an outlet from which the reductant is directed into an exhaust system.
Claims18
A reductant generator comprising:
- a housing defining a chamber;
- an inlet to direct engine exhaust gas into the chamber;
- a piston or moveable member receiving driving input from an engine and configured to compress engine exhaust gases within the chamber;
- a doser or injector to provide a fluid into the chamber to be transformed into reductant;
- an outlet from which the reductant is directed into an exhaust system;
- and
- a turbine downstream of the engine and a first exhaust component downstream of the turbine, and wherein the inlet receives engine exhaust gases from a connection upstream of the turbine and the outlet directs the reductant to an injection point that is downstream of the turbine and upstream of the first exhaust component.
4 more elements
A vehicle exhaust system comprising:
- a first exhaust component positioned downstream of an engine, wherein the first exhaust component comprises a DOC or DOC/DPF;
- a second exhaust component positioned downstream of the first exhaust component, wherein the second exhaust component comprise a SCR or SCRF;
- a reductant generator that comprises
- a housing defining a chamber, wherein the housing includes a fluid inlet,
- an intake valve associated with an exhaust gas inlet to the housing to direct engine exhaust gas into the chamber, the exhaust gas inlet being separate from the fluid inlet,
- a piston receiving driving input from the engine and configured to compress engine exhaust gases within the chamber,
- a doser or injector to provide a fluid into the chamber via the fluid inlet to be transformed into reductant, and
- an exhaust valve from which the reductant is directed into an injection point that is downstream of the first exhaust component and upstream of the second exhaust component;
- and
- a turbine downstream of the engine and upstream from the first exhaust component, and wherein the intake valve receives engine exhaust gases from a connection upstream of the turbine and the exhaust valve directs the reductant to the injection point.
7 more elements
A method of generating a reductant comprising:
- providing a piston that is movable through a reductant generation cycle that includes an exhaust gas intake, a compression, an injection of fluid, and a reductant release;
- drawing engine exhaust gases into a chamber;
- compressing the engine exhaust gases to increase a temperature within the chamber;
- injecting a fluid into the chamber after the temperature has increased to transform injected fluid into a reductant;
- and
- directing the reductant from the chamber to an exhaust system;
- including providing the chamber with an intake valve and an exhaust valve, and
- during the exhaust gas intake, opening the intake valve, closing the exhaust valve, and moving the piston to increase a volume of the chamber,
- during the compression, closing the intake valve, closing the exhaust valve, and moving the piston to decrease the volume of the chamber and increase the temperature inside the chamber,
- during the injection of fluid, closing the intake valve, closing the exhaust valve, injecting the fluid into the chamber, and initiating movement of the piston to increase the volume of the chamber and transform the fluid into reductant, and
- during the reductant release, closing the intake valve, opening the exhaust valve, and moving the piston to decrease the volume of the chamber and exhaust the reductant to the exhaust system.
8 more elements
Dependencies are inferred from the claim text.