Patent application number | Description | Published |
20090019838 | DIESEL PARTICULATE FILTER EXTENDED IDLE REGENERATION - A method of regenerating a diesel particulate filter (DPF) may include operating a vehicle including a diesel engine at an idle condition and applying a load to the diesel engine during the idle condition to increase an exhaust temperature of the diesel engine relative to a nominal idle condition. The increased exhaust temperature may regenerate a diesel particulate filter of the diesel engine during the idle condition. | 01-22-2009 |
20090044520 | Intake Air Heater for Assisting DPF Regeneration - An apparatus and a method for enhancing diesel engine performance is provided. At low engine load and cold ambient temperatures, an intake air heater increases the engine load via an engine alternator, which in turn, enables the engine to burn more fuel by the process of combustion. The combusted fuel elevates exhaust gas temperatures, which thereby accommodates cold start, controls white smoke, and aids DPF regeneration. | 02-19-2009 |
20100089042 | TWO-STAGE REGENERATION OF DIESEL PARTICULATE FILTER - In accordance with exemplary embodiments, the present invention relates to systems and methods for regeneration of a filter, particularly a diesel particulate filter. In one exemplary embodiment, a method of regeneration of a particulate matter filter is provided. The method includes providing a heat source for regeneration of a particulate matter filter. The heat source is disposed proximate or upstream from the particulate matter filter. The method also includes activating the heat source to generate a first temperature profile of the heat source, the first temperature profile including a first temperature average. The method further includes increasing the temperature of the heat source to generate a second temperature profile of the heat source, the second temperature profile including a second temperature average, wherein the second temperature average is greater than the first temperature average. | 04-15-2010 |
20110162629 | METHOD AND SYSTEM FOR CONTROLLING AN ENGINE DURING DIESEL PARTICULATE FILTER REGENERATION WARM-UP - A method and control system for controlling an engine during diesel particulate filter regeneration includes a diesel particulate filter (DPF) regeneration request module that generates a DPF regeneration request signal. The control system also includes a DPF regeneration control module that controls the oxygen level in the exhaust based on an oxygen level signal corresponding to an oxygen level in the exhaust and a DPF inlet temperature signal corresponding to the DPF inlet temperature. | 07-07-2011 |
20110209463 | METHOD AND SYSTEM FOR CONTROLLING AN ENGINE DURING DIESEL PARTICULATE FILTER REGENERATION AT IDLE CONDITIONS - A method and control system for controlling an engine during diesel particulate filter regeneration includes a diesel particulate filter (DPF) regeneration request module that generates a DPF regeneration request signal and an idle condition module that generates an idle condition signal when the engine is at an idle condition. A DPF regeneration control module initiates a timer in response to the DPF regeneration request signal and the idle condition signal. The DPF regeneration control module controls the engine oxygen level to a second level less than a first level corresponding to a non-idle speed level, and after a time period, controls the engine to generate oxygen at a third level greater than the second level. | 09-01-2011 |
20110271656 | CONTROL SYSTEM AND METHOD FOR PREVENTING HYDROCARBON SLIP DURING PARTICULATE MATTER FILTER REGENERATION - An engine control system includes an injection determination module and an injection regulation module. The injection determination module determines a desired rate of hydrocarbon (HC) injection into exhaust gas produced by an engine for regeneration of a particulate matter (PM) filter. The injection regulation module increases a rate of HC injection from a first rate to the desired rate during a predetermined period before regeneration of the PM filter, wherein the predetermined period is based on a difference between a predetermined temperature and a temperature at an outlet of an oxidation catalyst (OC). | 11-10-2011 |
20110271657 | CONTROL SYSTEM AND METHOD FOR IMPROVED EFFICIENCY OF PARTICULATE MATTER FILTER REGENERATION - An engine control system includes an injection determination module and an injection distribution module. The injection determination module determines a desired amount of hydrocarbons (HC) to inject into exhaust gas produced by an engine for regeneration of a particulate matter (PM) filter. The injection distribution module controls a ratio of auxiliary injection to post-combustion injection based on engine load, engine speed, and the desired amount of HC injection, wherein auxiliary injection includes injecting HC into the exhaust gas, and wherein post-combustion injection includes injecting HC into cylinders of the engine during a period after combustion. | 11-10-2011 |
20130180231 | EXHAUST AFTERTREATMENT SYSTEM - In one exemplary embodiment of an exhaust aftertreatment system, the system includes an oxidation catalyst configured to receive an exhaust gas flow from an internal combustion engine and a particulate filter positioned downstream of the oxidation catalyst, the particulate filter comprising a substrate. The system also includes a nitrogen oxide adsorbing catalyst applied to a downstream portion of the substrate and a selective catalytic reduction device positioned downstream of the nitrogen oxide adsorbing catalyst, wherein the selective catalytic reduction device is configured to remove nitrogen oxides from the exhaust gas flow. | 07-18-2013 |