| 摘要 |
An exhaust treatment system is provided including: a selective catalyst reduction (SCR) unit; a reducing agent dispensing unit configured to introduce a reducing agent into the exhaust; a first NOX sensor upstream of the SCR unit; a second NOX sensor at a location downstream of the SCR unit; a first temperature sensor at a location upstream of where the reducing agent is introduced into the exhaust; a second temperature sensor at a location downstream of where the reducing agent is introduced into the exhaust and upstream of the SCR unit; and a controller configured to determine a reductant quality indicator according to a NOX differential between the first NOX sensor and the second NOX sensor relative to a predicted NOX differential and a temperature differential between the first temperature sensor and the second temperature sensor relative to a predicted temperature differential.
|
