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US 11,053,879 B2Granted
Method and system for diagnosing exhaust sensors
AssigneeScania CV AB
InventorMikael Lundström
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AssigneeScania CV AB
InventorMikael Lundström
Estimating the term…
Provided is a method for diagnosing exhaust sensors, where at least one substance resulting from combustion is reduced by an additive. A first sensor intended to measure an occurrence of said substance upstream said supply of additive, and a second sensor intended to measure an occurrence of said substance downstream said supply of additive. The method comprises: determining whether the locations of said first and second sensors are reversed by: determining if a second measurement value of said second sensor exceeds a corresponding first measurement value of said first sensor at least to a first extent, and when this condition occurs, determining that the locations of said first and second sensors sensor are reversed, said measurement values are determined when a supply of additive is set to obtain at least a first reduction of said at least one substance to be reduced.
A computer implemented method for diagnosing exhaust sensors subjected to exhaust gases resulting from combustion, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion by supplying an additive comprising a reagent to an exhaust gas stream resulting from said combustion, wherein a first exhaust sensor is subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location upstream of said supply of additive, and a second exhaust sensor being subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location downstream of said supply of additive, the method comprising:
A system for diagnosing exhaust sensors subjected to exhaust gases resulting from combustion, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion by supplying an additive comprising a reagent to an exhaust gas stream resulting from said combustion, wherein a first exhaust sensor is subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location upstream said supply of additive, and a second exhaust sensor being subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location downstream said supply of additive, the system comprising:
A vehicle comprising a system for diagnosing exhaust sensors subjected to exhaust gases resulting from combustion, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion by supplying an additive comprising a reagent to an exhaust gas stream resulting from said combustion, wherein a first exhaust sensor is subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location upstream said supply of additive, and a second exhaust sensor being subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location downstream said supply of additive, the system comprising:
A computer program product comprising computer program code stored on a non-transitory computer-readable medium, said computer program product for diagnosing exhaust sensors subjected to exhaust gases resulting from combustion, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion by supplying an additive comprising a reagent to an exhaust gas stream resulting from said combustion, wherein a first exhaust sensor is subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location upstream of said supply of additive, and a second exhaust sensor being subjected to the exhaust gas stream and intended to measure an occurrence of said at least one substance at a location downstream of said supply of additive, said computer program product comprising computer instructions means for causing said at least on control unit to:
Dependencies are inferred from the claim text.