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US 11,643,962 B2Granted
System and method for low CO emission engine
AssigneeKohler Co.
InventorsEric Pekrul, Martin L. Radue
Life of this patent
Estimating the term…
Abstract
In one aspect, a system is provided and includes an engine including an exhaust valve, an exhaust manifold downstream of the exhaust valve and a muffler downstream of the exhaust manifold. The system also includes a catalyst positioned downstream of the exhaust valve.
Claims18
A system, comprising:
- an engine including an exhaust valve, an exhaust manifold downstream of the exhaust valve and a muffler downstream of the exhaust manifold;
- a catalyst positioned within the muffler;
- a fuel injector;
- and
- a controller connected with the fuel injector, the controller comprising a processor connected to a memory device storing instructions which cause the processor to perform dithering to run the engine rich/lean for a period of seconds allowing the catalyst to re-oxygenate and control chemical pollutants in exhaust, wherein the dithering is used to find a stoichiometric point of the engine, and the controller is used to control the rich/lean run of the engine along with the dithering speed and amplitude by running the engine lean of stoichiometric to reduce hydrocarbons and carbon monoxide and by running the engine rich of stoichiometric to reduce nitrogen oxide;
- wherein the muffler comprises a chamber, a muffler partition, and an inlet, the exhaust manifold fluidly coupled to the inlet and the inlet located between the exhaust manifold and the chamber;
- wherein the muffler partition defines a wall of the chamber, the muffler partition comprising an entrance cone for the catalyst;
- wherein the chamber is fluidly coupled to the catalyst, the inlet offset from the catalyst such that no portion of the catalyst aligns with the inlet, the inlet and the catalyst being parallel;
- and
- wherein a cross-sectional area of the entrance cone decreases with increasing distance from the inlet.
7 more elements
A system comprising:
- an engine, the engine comprising:
- an exhaust valve;
- an exhaust manifold fluidly coupled to the exhaust valve;
- and
- a muffler fluidly coupled to the exhaust manifold, the muffler comprising an inlet, a chamber, a muffler partition defining a wall of the chamber, and an outlet;
- a catalyst positioned within the muffler between the chamber and the outlet, the catalyst offset from the inlet such that no portion of the catalyst aligns with the inlet, the catalyst and the inlet being parallel;
- a fuel injector;
- and
- a controller configured to operate the fuel injector, the controller comprising a processor connected to a memory device storing instructions which cause the processor to dither an air/fuel ratio about a stoichiometric ratio;
- wherein the muffler partition comprises an entrance cone for the catalyst, the entrance cone tapering toward the catalyst.
7 more elements
Dependencies are inferred from the claim text.