公开(公告)号：US11781464B1

公开(公告)日：2023-10-10

申请号：US17657576

申请日：2022-03-31

Applicant: Caterpillar Inc.

Inventor： Frank Lombardi ,  Baoyong Liu ,  Urvish Joshi ,  Austin Bierle ,  Jay Venkataraghavan ,  Kent Anthony Schonert

IPC: F01N11/00 ,  F01N3/20 ,  F01N9/00

CPC classification number: F01N11/00 ,  F01N3/208 ,  F01N9/005 ,  F01N9/007 ,  F01N11/007 ,  F01N2550/02 ,  F01N2550/05 ,  F01N2900/04 ,  F01N2900/0406 ,  F01N2900/0408 ,  F01N2900/0412 ,  F01N2900/06 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1602 ,  F01N2900/1614 ,  F01N2900/18 ,  F01N2900/1814

Abstract: A method for estimating a quality of reductant in an engine aftertreatment system for an engine using a virtual sensor, the method comprising: determining whether an enablement condition is met, wherein the enablement condition is one or more of: a reductant fill condition determined based on data received from one or more float sensors associated with the engine; a machine start condition determined based on machine speed data obtained from a speed sensor associated with the engine; and/or a rationality check condition determined based on data associated with a fault of one or more sensors associated with the engine; upon determining that the enablement condition is met, receiving NOx measurement data obtained from at least one NOx sensor; generating a reductant quality value based on the NOx measurement data; and outputting a reductant quality determination based on the reductant quality value.