Patent application number | Description | Published |
20080223019 | SCR COLD START HEATING SYSTEM FOR A DIESEL EXHAUST - An exhaust system includes a heating element that is disposed downstream from an engine and that introduces thermal energy into an exhaust of the engine. A selective catalyst reduction (SCR) unit is disposed downstream from the heating element and filters nitrogen oxides (NOx) within the exhaust. A control module is in communication with and energizes the heating element based on temperature of the SCR unit. | 09-18-2008 |
20080282671 | Electrically heated particulate filter propagation support methods and systems - A control system that controls regeneration of a particulate filter is provided. The system generally includes a regeneration module that controls current to the particulate filter to initiate combustion of particulate matter in the particulate filter. A propagation module estimates a propagation status of the combustion of the particulate matter based on a combustion temperature. A temperature adjustment module controls the combustion temperature by selectively increasing a temperature of exhaust that passes through the particulate filter. | 11-20-2008 |
20080282673 | Hybrid cold start strategy using electrically heated catalyst - A method of operating an engine control system includes generating an engine start signal, determining whether a cold start condition exists, energizing an electrically heated catalyst based on the cold start condition, determining the temperature of the electrically heated catalyst and selectively starting an engine based on the engine start signal and the electrically heated catalyst temperature. | 11-20-2008 |
20080282678 | Electrically heated particulate filter restart strategy - A control system that controls regeneration of a particulate filter is provided. The system generally includes a propagation module that estimates a propagation status of combustion of particulate matter in the particulate filter. A regeneration module controls current to the particulate filter to re-initiate regeneration based on the propagation status. | 11-20-2008 |
20080282686 | Hybrid HC absorber/EHC PZEV exhaust architecture - A system may include a hydrocarbon (HC) absorber positioned in an exhaust flow path and an electrically heated catalyst (EHC) positioned in the exhaust flow path downstream of the HC absorber. | 11-20-2008 |
20080307776 | ELECTRICALLY HEATED PARTICULATE FILTER REGENERATION USING HYDROCARBON ADSORBENTS - An exhaust system that processes exhaust generated by an engine is provided. The system generally includes a particulate filter (PF) that filters particulates from the exhaust wherein an upstream end of the PF receives exhaust from the engine. A grid of electrically resistive material selectively heats exhaust passing through the upstream end to initiate combustion of particulates within the PF. A hydrocarbon adsorbent coating applied to the PF releases hydrocarbons into the exhaust to increase a temperature of the combustion of the particulates within the PF. | 12-18-2008 |
20080307781 | ELECTRICALLY HEATED PARTICULATE FILTER USING CATALYST STRIPING - An exhaust system that processes exhaust generated by an engine is provided. The system generally includes a particulate filter (PF) that filters particulates from the exhaust wherein an upstream end of the PF receives exhaust from the engine. A grid of electrically resistive material is applied to an exterior upstream surface of the PF and selectively heats exhaust passing through the grid to initiate combustion of particulates within the PF. A catalyst coating is applied to the PF that increases a temperature of the combustion of the particulates within the PF. | 12-18-2008 |
20090038295 | Electrically heated DPF start-up strategy - An exhaust system that processes exhaust generated by an engine has a diesel particulate filter (DPF) that is disposed downstream of the engine and that filters particulates in the exhaust. An electrical heater is disposed upstream of the DPF and selectively heats the exhaust to initiate combustion of the particulates. Heat generated by combustion of particulates in the heater induces combustion of particulates within the DPF. A control module selectively enables current flow to the electrical heater for an initial period of a DPF regeneration cycle, and limits exhaust flow while the electrical heater is heating to a predetermined soot combustion temperature. | 02-12-2009 |
20090150059 | COLD START EMISSION STRATEGY FOR HYBRID VEHICLES - An engine control module includes an engine starting module that communicates with an electric motor to operate an internal combustion engine including M fuel injectors and that determines whether manifold pressure is below a manifold pressure threshold. A warming module communicates with the M fuel injectors to inject fuel into N of M the fuel injectors when the manifold pressure is less than the manifold pressure threshold. N and M are integers and N is less than M. | 06-11-2009 |