SYSTEM AND METHOD FOR DIAGNOSING THE SELECTIVE CATALYTIC REDUCTION SYSTEM OF A MOTOR VEHICLE
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United States of America Patent
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Jun 16, 2016
app pub date -
Jun 13, 2014
filing date -
Jun 28, 2013
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Abstract
A system and method for diagnosing selective catalytic reduction system of a motor vehicle, the system including an internal combustion engine connected by an exhaust manifold to, successively, an assembly including a nitrogen oxide catalyst and a particle filter and a selective catalytic reduction system, a mechanism draining mass of ammonia stored in the selective catalytic reduction system, a mechanism controlling draining, and a mechanism injecting urea positioned upstream of the selective catalytic reduction system, a mechanism measuring quantity of ammonia at an outlet of the selective catalytic reduction system, a system determining maximum mass of ammonia stored in the selective catalytic reduction system, and a comparison mechanism configured to transmit a fault signal based on a result of a comparison between the maximum mass of ammonia stored in the selective catalytic reduction system and a threshold.
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