Patent application number | Description | Published |
20090272099 | APPARATUS, SYSTEM, AND METHOD FOR DETERMINING THE DEGRADATION OF AN SCR CATALYST - According to one representative embodiment, an apparatus for determining the degradation of a selective catalytic reduction (SCR) catalyst of an engine exhaust aftertreatment system includes a system properties module configured to store at least one system dynamics property value of the exhaust system at a first time and receive the at least one system dynamics property value of the exhaust aftertreatment system at a second time subsequent to the first time. The apparatus also includes a system dynamics module configured to determine a storage capacity of the SCR catalyst based on a comparison between the at least one system dynamic property value at the first time and the at least one system dynamic property value at the second time. Additionally, the apparatus includes an SCR catalyst degradation factor module configured to determine an SCR catalyst degradation factor based at least partially on the storage capacity of the SCR catalyst. | 11-05-2009 |
20090272101 | APPARATUS, SYSTEM, AND METHOD FOR CONTROLLING AMMONIA SLIP FROM AN SCR CATALYST - Various embodiments of an apparatus, system, and method are disclosed for reducing NO | 11-05-2009 |
20090272104 | APPARATUS, SYSTEM, AND METHOD FOR REDUCING NOx EMISSIONS ON AN SCR CATALYST USING AMMONIA STORAGE AND SLIP CONTROL - Various embodiments of an apparatus, system, and method are disclosed for reducing NO | 11-05-2009 |
20090272105 | APPARATUS, SYSTEM, AND METHOD FOR REDUCING NOx EMISSIONS ON AN SCR CATALYST - Various embodiments of an apparatus, system, and method are disclosed for reducing NO | 11-05-2009 |
20100024390 | APPARATUS, SYSTEM, AND METHOD FOR REDUCING NOx EMISSIONS ON AN SCR CATALYST - According to one representative embodiment, an apparatus for reducing NO | 02-04-2010 |
20100024397 | APPARATUS, SYSTEM, AND METHOD FOR REDUCING NOx EMISSIONS FROM AN ENGINE SYSTEM - Various embodiments of an apparatus, system, and method are disclosed for controlling NO | 02-04-2010 |
20100242440 | APPARATUS, SYSTEM, AND METHOD FOR ESTIMATING AN NOx CONVERSION EFFICIENCY OF A SELECTIVE CATALYTIC REDUCTION CATALYST - According to one exemplary embodiment, an apparatus is disclosed for estimating an NO | 09-30-2010 |
20110047964 | METHODS, SYSTEMS, AND APPARATUSES OF SCR DIAGNOSTICS - One embodiment is a method including operating an SCR system at a plurality of commanded ammonia to NOx input ratios, providing a plurality of data indicating NOx output from the SCR system for the plurality of commanded ammonia to NOx input ratios, and evaluating the plurality of data to diagnose the SCR system. Additional embodiment are methods, systems, and apparatuses including SCR diagnostics. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings. | 03-03-2011 |
20120125081 | PARTICULATE FILTER DIAGNOSTICS - A system includes an internal combustion engine producing an exhaust stream, a particulate filtering device that treats the exhaust stream, a particulate sensor operatively coupled to the exhaust stream at a position downstream of the particulate filtering device, and a temperature sensor operatively coupled to the exhaust stream. The system includes a controller that interprets a particulate sensor particulate stability condition, interprets a particulate sensor input value and a particulate sensor temperature, compensates the particulate sensor input value in response to the particulate sensor temperature, and filters the compensated particulate sensor input value. The controller determines a soot accumulation value in response to the filtered compensated particulate sensor input value, interprets a diagnostic enable condition, and determines a particulate filter diagnostic value in response to the active diagnostic enable condition and the soot accumulation value. The controller provides the particulate filter diagnostic value to an output device. | 05-24-2012 |