Valve arrangement for split-flow close-coupled catalyst
AssigneeCummins Emission Solutions Inc.
InventorsAnand Srinivasan, John K. Heichelbech
Life of this patent
Estimating the term…
Abstract
An aftertreatment system includes: a first exhaust gas path comprising a heater; a second exhaust gas path comprising a first decomposition chamber configured to receive reductant and a first selective catalytic reduction catalyst downstream of the first decomposition chamber; a combined exhaust gas path downstream of the first exhaust gas path and the second exhaust gas path, the combined exhaust gas path configured to receive exhaust gas from both the first exhaust gas path and the second exhaust gas path; a selector valve configured to divert the exhaust gas between the first exhaust gas path and the second exhaust gas path based on a temperature of the exhaust gas; and a controller programmed to control the selector valve.
Claims20
An aftertreatment system comprising:
- a first exhaust gas path comprising a heater;
- a second exhaust gas path comprising a first decomposition chamber configured to receive reductant and a first selective catalytic reduction catalyst downstream of the first decomposition chamber;
- a combined exhaust gas path downstream of the first exhaust gas path and the second exhaust gas path, the combined exhaust gas path configured to receive exhaust gas from both the first exhaust gas path and the second exhaust gas path;
- a selector valve configured to divert the exhaust gas between the first exhaust gas path and the second exhaust gas path based on a temperature of the exhaust gas;
- and
- a controller programmed to control the selector valve such that:
- the selector valve diverts the exhaust gas to the first exhaust gas path when the temperature of the exhaust gas is equal to or less than a predetermined temperature threshold;
- and
- the selector valve diverts the exhaust gas to the second exhaust gas path when the temperature of the exhaust gas is greater than the predetermined temperature threshold;
- wherein:
- the heater is configured to heat the exhaust gas received in the first exhaust gas path;
- the first decomposition chamber is configured to receive the exhaust gas that has been diverted to the second exhaust gas path by the selector valve;
- and
- the first selective catalytic reduction catalyst is configured to receive the exhaust gas from the first decomposition chamber.
A method comprising:
- determining, by a controller associated with an aftertreatment system, a temperature of exhaust gas;
- comparing, by the controller, the temperature of the exhaust gas with a predetermined temperature threshold;
- when the temperature of the exhaust gas is equal to or less than the predetermined temperature threshold, adjusting a selector valve to a first position so as to divert the exhaust gas to a first exhaust gas path, and heating the exhaust gas in the first exhaust gas path;
- and
- when the temperature of the exhaust gas is greater than the predetermined temperature threshold, adjusting the selector valve to a second position so as to divert the exhaust gas to a second exhaust gas path;
- wherein:
- a first decomposition chamber of the second exhaust gas path is configured to receive the exhaust gas that has been diverted to the second exhaust gas path by the selector valve;
- a first selective catalytic reduction catalyst of the second exhaust gas path is configured to receive the exhaust gas from the first decomposition chamber;
- and
- the exhaust gas from the first exhaust gas path and the second exhaust gas path is diverted to a combined exhaust gas path that is downstream of the first exhaust gas path and the second exhaust gas path and configured to receive the exhaust gas from the first exhaust gas path and the second exhaust gas path.
A non-transitory computer-readable media comprising computer readable instructions stored thereon that when executed by a processor of an aftertreatment system causes the processor to:
- determine a temperature of exhaust gas;
- compare the temperature of the exhaust gas with a predetermined temperature threshold;
- when the temperature of the exhaust gas is equal to or less than the predetermined temperature threshold, adjust a selector valve to a first position so as to divert the exhaust gas to a first exhaust gas path, and heat the exhaust gas in the first exhaust gas path;
- and
- when the temperature of the exhaust gas is greater than the predetermined temperature threshold, adjust the selector valve to a second position so as to divert the exhaust gas to a second exhaust gas path;
- wherein:
- a first decomposition chamber of the second exhaust gas path is configured to receive the exhaust gas that has been diverted to the second exhaust gas path by the selector valve;
- a first selective catalytic reduction catalyst of the second exhaust gas path is configured to receive the exhaust gas from the first decomposition chamber;
- and
- the exhaust gas from the first exhaust gas path and the second exhaust gas path is diverted to a combined exhaust gas path that is downstream of the first exhaust gas path and the second exhaust gas path and configured to receive the exhaust gas from the first exhaust gas path and the second exhaust gas path.
Dependencies are inferred from the claim text.