Abstract: Methods and systems for reducing emissions of an internal combustion engine are described. In one example, an electric heater and a passive NOx absorber or other emissions control device are positioned in a passage downstream of a combustor so as to process emissions from the combustor before an engine is started.

Abstract: Methods and systems for operating an engine that includes a catalyst and a particulate filter are described. In one example, release of reductant from an injector may be determined according to a plurality of metrics so that reliability of a release indication may be improved. In addition, operation of an engine may be adjusted responsive to the release indication so that exhaust system temperatures may be maintained.

Abstract: Methods and systems for operating an engine that includes a catalyst and a particulate filter are described. In one example, release of reductant from an injector may be determined according to a plurality of metrics so that reliability of a release indication may be improved. In addition, operation of an engine may be adjusted responsive to the release indication so that exhaust system temperatures may be maintained.

Abstract: Methods and systems for operating an engine with a pump that is driven via the engine are described. In one example, start of opening of an injector that supplies a fluid to an engine exhaust system is timed based on a period of the pump so that the output of the fluid injector may be repeatable in the presence of fluid pressure oscillations that are periodic with pump rotation.

Abstract: Methods and systems for operating an engine with a pump that is driven via the engine are described. In one example, start of opening of an injector that supplies a fluid to an engine exhaust system is timed based on a period of the pump so that the output of the fluid injector may be repeatable in the presence of fluid pressure oscillations that are periodic with pump rotation.

Abstract: Methods and systems are provided for improving catalyst function during an engine cold-start. In one example, at key-off, a duration elapsed till a subsequent key-on is predicted based on drive history and spatial awareness data. Then, based on the duration, an identity and order of operating one or more catalyst heating devices is selected.

Abstract: Methods and systems are provided for improving catalyst function during an engine cold-start. In one example, at key-off, a duration elapsed till a subsequent key-on is predicted based on drive history and spatial awareness data. Then, based on the duration, an identity and order of operating one or more catalyst heating devices is selected.

Abstract: An exhaust system for an engine including an exhaust passage with an expanding flow area and at least an opening for transferring air external to within the exhaust passage to cool the exhaust, for example due to particulate filter regeneration.

Abstract: An exhaust system for an engine, comprising of a first exhaust passage providing a first flow area, a second exhaust passage communicatively coupled to the first exhaust passage, the second exhaust passage providing a second flow area greater than the first flow area, wherein the second exhaust passage is arranged downstream of the first exhaust passage, wherein a first wall surface of the first exhaust passage defines at least a first opening for transferring air external the first exhaust passage to within the first exhaust passage and a second wall surface of the second exhaust passage defines at least a second opening for transferring air external the second exhaust passage to within the second exhaust passage, a first protrusion disposed within the first exhaust passage upstream of the first opening, and a second protrusion disposed within the second exhaust passage upstream of the second opening.

Abstract: An exhaust system for an engine, comprising of a first exhaust passage providing a first flow area, a second exhaust passage communicatively coupled to the first exhaust passage, the second exhaust passage providing a second flow area greater than the first flow area, wherein the second exhaust passage is arranged downstream of the first exhaust passage, wherein a first wall surface of the first exhaust passage defines at least a first opening for transferring air external the first exhaust passage to within the first exhaust passage and a second wall surface of the second exhaust passage defines at least a second opening for transferring air external the second exhaust passage to within the second exhaust passage, a first protrusion disposed within the first exhaust passage upstream of the first opening, and a second protrusion disposed within the second exhaust passage upstream of the second opening.

Abstract: A method and system for controlling regeneration in a particulate filter coupled to an internal combustion engine. The method controls hydrocarbon injection into engine exhaust upstream of an oxidation catalyst disposed upstream of the particulate filter in accordance an algebraic sum of a feedforward term and a feedback term. The feedforward term is a function of a difference between with the engine exhaust temperature upstream of the catalyst and a predetermined desired particulate filter temperature. The feedback term is a function of a temperature of the particulate filter and the predetermined desired particulate filter temperature.

Abstract: A method and system for controlling regeneration in a particulate filter coupled to an internal combustion engine. The method controls hydrocarbon injection into engine exhaust upstream of an oxidation catalyst disposed upstream of the particulate filter in accordance an algebraic sum of a feedforward term and a feedback term. The feedforward term is a function of a difference between with the engine exhaust temperature upstream of the catalyst and a predetermined desired particulate filter temperature. The feedback term is a function of a temperature of the particulate filter and the predetermined desired particulate filter temperature.