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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.


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Patent
Wade J. Robel1
31 Mar 2008
TL;DR: In this article, a system for recovering engine exhaust energy is presented, which includes an exhaust system including a first exhaust branch and a second exhaust branch, and a control mechanism configured to control at least one of the first and second groups of exhaust valves according to a determined timing strategy.
Abstract: A system for recovering engine exhaust energy is provided. The system includes an exhaust system including a first exhaust branch and a second exhaust branch. The system includes a first and a second group of exhaust valves associated with a plurality of engine cylinders. The system also includes an energy recovering assembly. The system further includes a control mechanism configured to control at least one of the first and second groups of exhaust valves according to a determined timing strategy based on at least one engine operating parameter.

39 citations

Patent
28 Jun 1995
TL;DR: In this paper, an automotive internal combustion engine air/fuel ratio control system is diagnosed by monitoring the oxygen content of catalytically treated engine exhaust gas for sustained deviations into regions of saturation in which the catalytic treatment device is characterized by low treatment efficiency.
Abstract: An automotive internal combustion engine air/fuel ratio control system is diagnosed by monitoring the oxygen content of catalytically treated engine exhaust gas for sustained deviations into regions of saturation in which the catalytic treatment device is characterized by low treatment efficiency. The oxygen content of catalytically treated engine exhaust gas is periodically sampled under test conditions and the samples processed into representative values for comparison to a predetermined range. Persistent excursions outside the range indicate a fault condition in which the air/fuel ratio control system operation is not supportive of efficient exhaust gas aftertreatment.

39 citations

Patent
22 Mar 1999
TL;DR: In this article, a control system for monitoring an operating parameter of an engine (10) is presented, where the control system interprets the operating parameter within a controller (80) and the controller causes an exhaust valve regulator (66) to move between an open position (70) and a closed position (72).
Abstract: Past exhaust emission control systems have failed to clean the exhaust gas prior to mixing with the intake air. The present exhaust emission control system (60) removes at least a portion of the exhaust constituents from a flow of exhaust gas (20) prior to mixing with a flow of intake air (24). The present exhaust emission control system includes a control system (74) for monitoring an operating parameter of an engine (10). The control system (74) interprets the operating parameter within a controller (80) and the controller (80) causes an exhaust valve regulator (66) to move between an open position (70) and a closed position. Thus, the movement of the exhaust valve regulator (66) infinitely between the open position (70) and the closed position (72) defines the quantity of flow of exhaust gas (20) to be mixed with the flow of intake air (24) and controls the emission, especially of NOx, being emitted from the engine (10) depending on the operating parameters of the engine (10).

39 citations

Journal ArticleDOI
TL;DR: The results indicate that air injection improves cookstove performance and reduces total PM mass but increases total ultrafine PM concentration over the course of high-power cooking.
Abstract: In order to address the health risks and climate impacts associated with pollution from cooking on biomass fires, researchers have focused on designing new cookstoves that improve cooking performance and reduce harmful emissions, specifically particulate matter (PM). One method for improving cooking performance and reducing emissions is using air injection to increase turbulence of unburned gases in the combustion zone. Although air injection reduces total PM mass emissions, the effect on PM size distribution and number concentration has not been thoroughly investigated. Using two new wood-burning cookstove designs from Lawrence Berkeley National Laboratory, this research explores the effect of air injection on cooking performance, PM and gaseous emissions, and PM size distribution and number concentration. Both cookstoves were created using the Berkeley-Darfur Stove as the base platform to isolate the effects of air injection. The thermal performance, gaseous emissions, PM mass emissions, and particle concentrations (ranging from 5 nm to 10 μm in diameter) of the cookstoves were measured during multiple high-power cooking tests. The results indicate that air injection improves cookstove performance and reduces total PM mass but increases total ultrafine (less than 100 nm in diameter) PM concentration over the course of high-power cooking.

39 citations

Patent
23 Mar 1988
TL;DR: In this paper, a system for utilizing the waste heat from the exhaust system of automotive vehicles to provide for increased traction of the drive wheels of such vehicles was proposed, where exhaust gases and/or air passing in heat exchange relationship with the exhaust gases pass through a blower unit and through conduits which direct the heated gases to areas proximate to the vehicle drive wheels.
Abstract: A system for utilizing the waste heat from the exhaust systems of automotive vehicles to provide for increased traction of the drive wheels of such vehicles wherein the exhaust gases and/or air passing in heat exchange relationship with the exhaust gases pass through a blower unit and through conduits which direct the heated gases to areas proximate to the vehicle drive wheels.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202327
202277
202160
2020146
2019173
2018159