NATURAL GAS ENGINE AFTERTREATMENT SYSTEM

摘要

Systems and methods for reducing methane in an aftertreatment system of a vehicle are described. An oxidation catalyst is disposed in an exhaust path between an engine block and a turbocharger. The oxidation catalyst stores methane in the exhaust gas from the engine block during low temperatures and oxidizes the stored methane during high temperatures. The temperatures at the oxidation catalyst are controlled, in part, by operating engine cycles and/or a back pressure valve that can adjust pressure in the exhaust path and/or increase engine load.

主权项

1. An aftertreatment system for use in a vehicle, comprising:
an oxidation catalyst disposed in an exhaust path between an engine block and a turbocharger, wherein the oxidation catalyst is configured to store methane during a first temperature of a first portion of an operating engine cycle and to oxidize the stored methane during a second temperature of a second portion of the operating engine cycle, and wherein the first temperature is less than the second temperature.