Secondary air injection

About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.

Dual-fuel and spark ignited gas internal combustion engine excess air control system and method

Abstract: An excess air control system and method (10) for a dual-fuel or spark ignition gas internal combustion engine (12) is provided. The controller (18) senses the exhaust temperature, senses the air manifold temperature, senses the air manifold pressure, and measures the engine power output of the engine (12). Based on these measurements and engine characterization data, a target air manifold pressure is computed. The target air manifold pressure is compared with the sensed air manifold pressure, and an air blowoff valve coupled to an air bypass line linking the air intake to the turbocharger (36) and the air manifold (40) is either opened or closed to achieve the target air manifold pressure.

Natural gas powered engine

Abstract: A method of producing near zero NO x and near zero CO emissions in exhaust gas from an internal combustion engine using a gaseous fuel comprised of natural gas and at least one additional gas selected from hydrogen and carbon monoxide. A first portion of the exhaust gas is recycled for providing dilution of the fuel charge. A second portion of the exhaust gas is discharged to the atmosphere. The engine is operated to combust the gaseous fuel with air under exhaust gas recycle conditions which produce near zero NO x emissions and near zero CO emission in the exhaust discharged to the atmosphere.

Method to reduce diesel engine exhaust emissions

Abstract: A combustion air management and emission control system (18) injects supplemental air directly into combustion chambers (14A-14D) of a diesel engine (10) to reduce particulates in exhaust gases being emitted from the engine (10). A portion of intake air flowing toward an intake manifold (12) of the engine (10) is diverted to a compressor (30) so that controlled quantities of pressurized supplemental air to be injected directly into each of the combustion chambers (14A-14D) while the piston (36A-36D) within the combustion chambers (14A-14D) is in its expansion and/or exhaust strokes. At least a portion of the diverted intake air can be directed through a selectively permeable membrane device (20) so that oxygen-enriched air and nitrogen-enriched air are produced. At least a portion of the oxygen-enriched air is supplied to the compressor (30) so that the supplemental air is injected into the combustion chambers (14A-14D) will contain a desired, elevated amount of oxygen.

Method and device for the control of an exhaust treatment system

Abstract: A method and device for the control of an exhaust treatment system, in particular on an internal combustion engine are disclosed. A special operation is periodically carried out, whereby the control and/or monitoring of the special operation is carried out depending upon a first parameter (01), characterising the oxygen concentration in the exhaust gases before the exhaust treatment system and a second parameter (02), characterising the oxygen concentration in the exhaust gases after the exhaust treatment system.