Exhaust gas treatment system with improved low temperature performance
AssigneeDeere & Company
InventorsDanan Dou, Eric J. Hruby, Bryan T. Geisick
Life of this patent
Estimating the term…
Abstract
A method of treating exhaust gas from an internal combustion engine as the exhaust gas passes through an exhaust gas pathway includes injecting reductant into the exhaust gas pathway with a reductant injector, filtering particulate matter from the exhaust gas with a first treatment element located downstream of the reductant injector, oxidizing soot on the first treatment element with ozone, and converting nitrogen oxides (NOx) from the exhaust gas with a second treatment element located downstream of the reductant injector.
Claims14
A method of treating exhaust gas from an internal combustion engine as the exhaust gas passes through an exhaust gas pathway, the method comprising:
- generating ozone with an ozone generator, the ozone generator in fluid communication with an air intake of the internal combustion engine and with an ozone injector;
- supplying ozone from the ozone generator into the air intake;
- injecting reductant into the exhaust gas pathway with a reductant injector;
- filtering particulate matter from the exhaust gas with a first treatment element located downstream of the reductant injector;
- injecting ozone from the ozone generator into the exhaust gas pathway upstream of the first treatment element with the ozone injector;
- oxidizing soot on the first treatment element with ozone;
- converting nitrogen oxides (NOx) from the exhaust gas with a second treatment element located downstream of the reductant injector
- determining whether the exhaust gas treatment system is in a cold operating state based on feedback from a sensor;
- and
- activating the ozone generator when the exhaust gas treatment system is in the cold operating state.
A method of treating exhaust gas from an internal combustion engine as the exhaust gas passes through an exhaust gas pathway, the method comprising:
- injecting reductant into the exhaust gas pathway with a reductant injector;
- injecting ozone into the exhaust gas pathway with an ozone injector;
- filtering particulate matter from the exhaust gas with a first treatment element located downstream of the reductant injector and the ozone injector;
- oxidizing soot on the first treatment element with the ozone;
- converting nitrogen oxides (NOx) from the exhaust gas with a second treatment element located downstream of the first treatment element;
- determining whether the exhaust gas treatment system is in a cold operating state based on feedback from a sensor;
- and
- supplying additional ozone into an air intake of the internal combustion engine when the exhaust gas treatment system is in the cold operating state.
A method of treating exhaust gas from an internal combustion engine as the exhaust gas passes through an exhaust gas pathway, the method comprising:
- injecting reductant into the exhaust gas pathway with a reductant injector;
- filtering particulate matter from the exhaust gas with a first treatment element located downstream of the reductant injector and the ozone injector;
- converting nitrogen oxides (NOx) from the exhaust gas with a second treatment element located downstream of the first treatment element;
- determining whether the exhaust gas treatment system is in a cold operating state based on feedback from a sensor;
- and
- supplying the ozone into an air intake of the internal combustion engine when the exhaust gas treatment system is in the cold operating state.
Dependencies are inferred from the claim text.