Method and Apparatus for Controlling an Exhaust Gas After-Treatment System
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United States of America Patent
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Issued Date -
Jul 23, 2015
app pub date -
Jul 26, 2013
filing date -
Jul 27, 2012
priority date (Note) -
Abandoned
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Abstract
A combustion engine exhaust gas after-treatment device includes a first selective catalytic reduction (SCR) device, a second SCR device downstream of the first and a diesel particulate filter (DPF) between the first and second SCR devices. A method of dosing the after-treatment device includes: allowing dosing of the first SCR device with reductant only when its temperature is within its the operating temperature range; and allowing dosing of the second SCR device with reductant only when its temperature is within its different operating temperature range; and reducing the level of dosing of the first SCR device when requiring DPF regeneration.
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