| Patent application number | Description | Published |
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| 20090084333 | METHOD AND APPARATUS FOR CONTINUOUSLY VARIABLE DIFFERENTIAL PHASING OF ENGINE VALVE OPERATION - An internal combustion engine includes a crankshaft and first and second cam actuated intake valves. A method for operating the engine includes providing a first intake cam configured to actuate the first cam actuated intake valve, and providing a second intake cam configured to actuate the second cam actuated intake valve. The second intake cam is phase adjustable relative to the crankshaft independently of the phase of the first intake cam relative to the crankshaft. A controller is provided and configured to selectively retard the phase of the second intake cam to effect later closing of the second cam actuated intake valve sufficiently to reduce the effective compression ratio of the engine. Additionally, the first intake cam may be phase adjustable relative to the crankshaft independently of the phase of the second intake cam relative to the crankshaft and the controller may additionally be configured to selectively advance the phase of the first intake cam to effect earlier opening of the first cam actuated intake valve sufficiently to increase internal exhaust gas recirculation. | 04-02-2009 |
| 20100057328 | LEAN NITROGEN OXIDE EMISSION CONTROL SYSTEM AND METHOD - A control system comprising an NH | 03-04-2010 |
| 20100107611 | METHOD AND APPARATUS FOR EXHAUST AFTERTREATMENT IN AN INTERNAL COMBUSTION ENGINE - A method and system for managing an exhaust gas feedstream from an internal combustion engine operative lean of stoichiometry includes steps and apparatus for diverting exhaust around a three-way catalytic converter during NOx adsorber regeneration thereby increasing reductants available in the NOx adsorber to react with the adsorbed NOx. | 05-06-2010 |
| 20100139248 | METHOD AND APPARATUS FOR CONTROLLING OPERATION OF A SPARK-IGNITION DIRECT-INJECTION ENGINE - Operation of a spark ignition, direct injection engine having an aftertreatment system including an oxidation catalyst and a selective catalyst reduction device is described. The method includes controlling to a stoichiometric air/fuel ratio and retarding spark ignition timing. Engine fueling is then controlled to a lean air/fuel ratio and spark is retarded. The engine is then operated to generate ammonia reductant. Engine operation then comprises operating at a preferred air/fuel ratio and controlling spark ignition timing to a preferred timing. | 06-10-2010 |
| 20100186390 | TECHNIQUE FOR PRODUCTION OF AMMONIA ON DEMAND IN A THREE WAY CATALYST FOR A PASSIVE SELECTIVE CATALYTIC REDUCTION SYSTEM - A method for controlling a powertrain includes selectively initiating an ammonia generation cycle, including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the combustion chamber after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, and utilizing a catalyst device between the engine and a selective catalytic reduction device to produce ammonia. | 07-29-2010 |
| 20100186391 | TECHNIQUE FOR PRODUCTION OF AMMONIA ON DEMAND IN A THREE WAY CATALYST FOR A PASSIVE SELECTIVE CATALYTIC REDUCTION SYSTEM - A method for controlling a powertrain includes selectively initiating an ammonia generation cycle including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the powertrain after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, utilizing a hydrogen forming catalyst to reform the injected fuel, and utilizing a catalyst device between the engine and the selective catalytic reduction device to produce ammonia. | 07-29-2010 |
| 20110088661 | COLD START SYSTEMS AND METHODS - A cylinder deactivation system comprises a fuel injection module and a cold start control module. The fuel injection module injects a desired amount of fuel into a cylinder of an engine during engine cranking. The cold start control module maintains an intake valve and an exhaust valve associated with the cylinder in respective closed positions while the desired amount of fuel is injected when at least one of an air temperature and a coolant temperature is less than a predetermined cold start temperature. | 04-21-2011 |
| Patent application number | Description | Published |
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| 20080229729 | CONTROL STRATEGY FOR LEAN NOx TRAP REGENERATION - A method for controlling regeneration of a lean NOx trap includes estimating an accumulated NOx in the lean NOx trap; determining whether the estimated NOx exceeds a first threshold value or a second threshold value; estimating the temperature of the lean NOx trap; determining whether the estimated temperature exceeds a threshold temperature; determining a desired air-fuel ratio for initiating a regeneration event, the desired air-fuel ratio being determined based upon the estimated NOx and the estimated temperature of the lean NOx trap; hastening the occurrence of a regeneration event when the estimated NOx exceeds the first threshold value through active control of engine operating regimes; and initiating a regeneration event when the estimated NOx exceeds the second threshold value or when the estimated temperature exceeds the threshold temperature by forcing homogenous operation of the engine at the desired air-fuel ratio. | 09-25-2008 |
| 20090038583 | MULTI-INJECTION COMBUSTION CYCLE SYSTEMS FOR SIDI ENGINES - The fuel injection system includes a fuel injector that injects fuel directly into a combustion chamber of a cylinder of an engine. The control module initiates multiple fuel injections in a combustion chamber during a combustion cycle of the cylinder via the fuel injector. | 02-12-2009 |
| 20090193792 | METHOD AND APPARATUS FOR MANAGING AN EXHAUST GAS FEEDSTREAM FOR A SPARK-IGNITION DIRECT-INJECTION ENGINE - The disclosure sets forth operating a spark-ignition, direct-fuel injection internal combustion engine equipped with an exhaust aftertreatment system including a lean-NOx reduction catalyst upstream of a second converter element. The engine preferentially operates in one of a homogeneous charge combustion mode and a stratified charge combustion mode based upon temperature of the lean-NOx reduction catalyst. Exhaust gas flow is selectively diverted to the second converter element. | 08-06-2009 |
| 20090193795 | METHOD AND APPARATUS FOR REGENERATING AN AFTERTREATMENT DEVICE FOR A SPARK-IGNITION DIRECT-INJECTION ENGINE - The disclosure sets forth operating a spark-ignition, direct-fuel injection internal combustion engine equipped with an exhaust aftertreatment system including a lean-NOx adsorber device. The engine is operated substantially un-throttled and at a lean air/fuel ratio and a first fuel pulse is injected to meet an engine output torque during a compression stroke of each engine cycle prior to a spark-ignition event. When regeneration of the lean-NOx adsorber device is commanded, a second fuel pulse is injected during a second engine stroke of each engine cycle. | 08-06-2009 |
| 20090198431 | METHOD AND APPARATUS FOR CONTROLLING MODE TRANSITION IN A SPARK-IGNITION DIRECT-INJECTION INTERNAL COMBUSTION ENGINE - The disclosure sets forth operating a spark-ignition, direct-fuel injection internal combustion engine, including transitioning the engine from operating in a stratified charge combustion mode to operating in a homogeneous charge combustion mode. External EGR flow is discontinued, and an in-cylinder trapped air mass and an in-cylinder EGR mass in an air intake system of the engine are estimated. Engine throttle position is controlled to achieve trajectories for air/fuel ratio and the in-cylinder EGR mass determined based upon the estimated in-cylinder trapped air mass and the in-cylinder EGR mass in the air intake system. A double-injection fueling strategy and a single-injection fueling are used during the transition. | 08-06-2009 |
