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US 2023/0167759 A1Published application
Method and system for sensor analysis in an exhaust gas aftertreatment system
AssigneeVolvo Truck Corporation
InventorsDan STENQVIST, Gustaf Lindberg
Life of this patent
Estimating the term…
Abstract
A computer implemented method to performing sensor analysis in an exhaust gas aftertreatment system (EATS) coupled downstream of an internal combustion engine (ICE). The methodology is specifically adapted for determining a scale factor for a NOx sensor that is arranged downstream of a position where an amount of a reductant is injected into exhaust gases from the ICE.
Claims15
A computer implemented method for sensor analysis in an exhaust gas aftertreatment system (EATS), wherein:
- the EATS is coupled downstream of an internal combustion engine (ICE) and provided for treating exhaust gases from the ICE, and
- the EATS or the ICE comprises a processing unit,
- wherein the method comprises:
- dosing, under control of the processing unit, a first amount of a reductant into the exhaust gases at a first position upstream of a first nitrogen oxide (NOx) sensor comprised with the EATS when operating the ICE at a first constant flow of NOx,
- receiving, at the processing unit, a first set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor,
- dosing, under control of the processing unit, a second amount of the reductant into the exhaust gases at the first position when operating the ICE at the first constant flow of NOx,
- receiving, at the processing unit, a second set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, and
- determining, using the processing unit, a scale factor for the first NOx sensor based on a combination of:
- the first amount of the reductant,
- the second amount of the reductant,
- the first set of measurement data,
- the second set of measurement data, and
- a predefined NOx conversion ratio for the first and the second amount of the reductant.
10 more elements
An engine system, comprising:
- an internal combustion engine (ICE),
- an exhaust gas aftertreatment system (EATS) coupled downstream of the ICE and provided for treating exhaust gases from the ICE,
- a first nitrogen oxide (NOx) sensor, and
- a processing unit,
- wherein the processing unit is arranged to:
- dose a first amount of a reductant into the exhaust gases at a first position upstream of a first nitrogen oxide (NOx) sensor comprised with the EATS when operating the ICE at a first constant flow of NOx,
- receive a first set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor,
- dose a second amount of the reductant into the exhaust gases at the first position when operating the ICE at the first constant flow of NOx,
- receive a second set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, and
- determine a scale factor for the first NOx sensor based on a combination of:
- the first amount of the reductant,
- the second amount of the reductant,
- the first set of measurement data,
- the second set of measurement data, and
- a predefined NOx conversion ratio for the first and the second amount of the reductant.
12 more elements
A computer program product comprising a non-transitory computer readable medium having stored thereon computer program means for sensor analysis in an exhaust gas aftertreatment system (EATS), wherein:
- the EATS is coupled downstream of an internal combustion engine (ICE) and provided for treating exhaust gases from the ICE, and
- the EATS or the ICE comprises a processing unit,
- wherein the computer program product comprises:
- code for dosing, under control of the processing unit, a first amount of a reductant into the exhaust gases at a first position upstream of a first nitrogen oxide (NOx) sensor comprised with the EATS when operating the ICE at a first constant flow of NOx,
- code for receiving, at the processing unit, a first set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor,
- code for dosing, under control of the processing unit, a second amount of the reductant into the exhaust gases at the first position when operating the ICE at the first constant flow of NOx,
- code for receiving, at the processing unit, a second set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, and
- code for determining, using the processing unit, a scale factor for the first NOx sensor based on a combination of:
- the first amount of the reductant,
- the second amount of the reductant,
- the first set of measurement data,
- the second set of measurement data, and
- a predefined NOx conversion ratio for the first and the second amount of the reductant.
10 more elements
Dependencies are inferred from the claim text.