Vehicle and a method of updating efficiency of a selective catalytic reduction filter of an exhaust treatment system of the vehicle

摘要

A vehicle and a method of updating efficiency of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of the vehicle are disclosed. The method includes obtaining an initial calculated efficiency of the SCRF, via a controller, regarding one of a NOx conversion, a reductant absorption, a reductant desorption and a reductant oxidation. The method also includes determining a soot mass estimate in the SCRF representative of an amount of soot collected inside the SCRF and determining a soot correction factor from the soot mass estimate. The method further includes calculating, via the controller, an updated efficiency value of the SCRF by multiplying the soot correction factor and the initial calculated efficiency to update efficiency of the SCRF.

主权项

1. A method of updating an efficiency of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of a vehicle, the method comprising:
obtaining an initial calculated efficiency of the SCRF, via a controller, regarding one of a NOx conversion, a reductant absorption, a reductant desorption and a reductant oxidation; determining a soot mass estimate in the SCRF representative of an amount of soot collected inside the SCRF; determining a soot correction factor from the soot mass estimate; calculating, via the controller, an updated efficiency value of the SCRF by multiplying the soot correction factor and the initial calculated efficiency to obtain an updated efficiency of the SCRF; and adjusting an amount of reductant being passed into an exhaust stream based on the updated efficiency of the SCRF.