Reductant generation systems and methods
AssigneeCummins Emission Solutions Inc.
InventorJacob Backhaus
Life of this patent
Estimating the term…
Abstract
A system comprises an engine including a plurality of cylinders. A first intake throttle is positioned upstream of a first set of cylinders of the plurality of cylinders. The first intake throttle provides air at a first flow rate to the first set of cylinders so as to produce a lean air/fuel mixture in the first set of cylinders. A second intake throttle is positioned upstream of a second set of cylinders included in the plurality of cylinders and in parallel of the first intake throttle. The second intake throttle provides air at a second flow rate to the second set of cylinders so as to produce a rich air/fuel mixture in the second set of cylinders.
Claims21
A system for use with an engine comprising a first cylinder and a second cylinder, the system comprising:
- a first inlet configured to receive air;
- an intake manifold configured to receive the air from the first inlet and to provide the air to the first cylinder and the second cylinder;
- an exhaust manifold configured to receive exhaust from the first cylinder and the second cylinder, the exhaust manifold comprising:
- a first exhaust outlet conduit configured to receive the exhaust from the first cylinder;
- and
- a second exhaust outlet conduit configured to receive the exhaust from the second cylinder;
- a first catalyst disposed along the second exhaust outlet conduit and configured to receive the exhaust from the second cylinder and to produce ammonia;
- and
- a first recirculation conduit coupled to the exhaust manifold and the intake manifold and configured to selectively provide the exhaust from the exhaust manifold to the intake manifold;
- wherein the second exhaust outlet conduit is isolated from the first exhaust outlet conduit upstream of the first catalyst and coupled to the first exhaust outlet conduit downstream of the first catalyst.
An aftertreatment system for an engine having a first cylinder and a second cylinder, the aftertreatment system comprising:
- an exhaust manifold comprising:
- a first exhaust outlet conduit configured to receive exhaust from the first cylinder;
- and
- a second exhaust outlet conduit configured to receive exhaust from the second cylinder;
- a first catalyst disposed along the second exhaust outlet conduit and configured to receive the exhaust from the second cylinder and to produce ammonia;
- a second catalyst disposed along the first exhaust outlet conduit and configured to receive the exhaust from the first cylinder and to oxidize the exhaust;
- a SCR system positioned downstream of the exhaust manifold and configured to receive the exhaust from the first catalyst and the second catalyst;
- and
- a third catalyst positioned downstream of the SCR system and configured to receive the exhaust from the SCR system and to oxidize the exhaust;
- wherein the first exhaust outlet conduit is isolated from the second exhaust outlet conduit upstream of the second catalyst;
- wherein the second exhaust outlet conduit is isolated from the first exhaust outlet conduit upstream of the first catalyst;
- and
- wherein the first exhaust outlet conduit is coupled to the second exhaust outlet conduit downstream of the first catalyst and the second catalyst and upstream of the SCR system.
A system for use with an engine having a first cylinder and a second cylinder, the system comprising:
- an inlet configured to receive air;
- an intake manifold configured to receive the air from the inlet and to provide the air to the first cylinder and the second cylinder;
- an exhaust manifold configured to receive exhaust from the first cylinder and the second cylinder, the exhaust manifold comprising:
- a first exhaust outlet conduit configured to receive the exhaust from the first cylinder;
- and
- a second exhaust outlet conduit configured to receive the exhaust from the second cylinder;
- a catalyst disposed along the second exhaust outlet conduit and configured to receive the exhaust from the second cylinder and to produce ammonia;
- and
- a recirculation conduit coupled to the first exhaust outlet conduit and the intake manifold and configured to selectively provide the exhaust from the first cylinder to the intake manifold;
- wherein the second exhaust outlet conduit is isolated from the first exhaust outlet conduit upstream of the catalyst and coupled to the first exhaust outlet conduit downstream of the catalyst;
- and
- wherein the second exhaust outlet conduit is coupled to the first exhaust outlet conduit downstream of the recirculation conduit.
Dependencies are inferred from the claim text.