US 10,371,036 B2 · System and method for monitoring particulate filter condition in an aftertreatment system

Abstract

A system and method for monitoring filtering condition in an aftertreatment system comprises measuring a first pressure upstream of a first particulate filter in the aftertreatment system. A second pressure downstream of the first particulate filter and upstream of a second particulate filter in the aftertreatment system is measured. A third pressure downstream of the second particulate filter is also measured. A difference in pressure between the second pressure and the third pressure is determined which corresponds to a filtering condition of the first particulate filter. The difference in pressure is compared with a predetermined threshold. If the difference in pressure exceeds the predetermined threshold the failure of the first particulate filter is identified.

Claims23

Dependent claims

A method for monitoring filtering condition in an aftertreatment system, comprising:

measuring a first pressure difference across a first particulate filter in the aftertreatment system;
measuring a second pressure difference across a second particulate filter in the aftertreatment system, the second particulate filter positioned downstream of the first particulate filter and upstream of a selective catalytic reduction system;
determining a filtering condition of the first particulate filter based on the first pressure difference and the second pressure difference;
measuring a third pressure downstream of the second particulate filter and upstream of the selective catalytic reduction system;
in response to the first pressure difference being within a predetermined range, determining if an absolute value of the third pressure exceeds a predetermined threshold;
in response to the absolute value of the third pressure exceeding the predetermined threshold, determining that the first particulate filter has failed;
and
generating a fault code indicating that the first particulate filter has failed.

5 more elements

An aftertreatment system, comprising;

a first particulate filter configured to receive an exhaust gas containing particulate matter and filter the exhaust gas to remove at least a portion of the particulate matter from the exhaust gas, the exhaust gas having a first pressure upstream of the first particulate filter and a second pressure downstream of the first particulate filter;
and
a second particulate filter positioned downstream of the first particulate filter, the second particulate filter configured to receive at least a portion of the filtered exhaust gas from the first particular filter and filter any remaining particulate matter from the exhaust gas, the exhaust gas having a third pressure downstream of the second particulate filter;
a selective catalytic reduction system positioned downstream of the second particulate filter, the third pressure being upstream of the selective catalytic reduction system;
and
a controller configured to:
determine a first pressure difference between the first pressure and the second pressure;
determine a second pressure difference between the second pressure and the third pressure;
in response to the first pressure difference being within a predetermined range, determining if an absolute value of the third pressure exceeds a predetermined threshold;
in response to the absolute value of the third pressure exceeding the predetermined threshold, determining that the first particulate filter has failed;
and
generate a fault code indicating that the first particulate filter has failed.

9 more elements

Dependencies are inferred from the claim text.

System and method for monitoring particulate filter condition in an aftertreatment system

Life of this patent

System and method for monitoring particulate filter condition in an aftertreatment system

Life of this patent

Abstract

Claims23