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.

Process and apparatus

Abstract: Exhaust gases from internal combustion engines are purified by catalytic treatment. The systems have an initial catalyst, preferably in a separate vessel near the engine, and a subsequently-in-line catalyst. Preferably, the catalysts are of the honeycomb-type. The exhaust gases and an excess of oxygen, with or without a supplemental fuel, are passed through the initial catalyst during the start-up of the engine to insure that the exhaust gases are purified more or less as soon as the engine begins operation. In order to reduce the amount of nitrogen oxides in the exhaust gas after start-up, an excess of extraneous fuel is fed to the initial catalyst to reduce nitrogen oxides to nitrogen. The subsequently-in-line catalyst serves to reduce the carbon monoxide and hydrocarbon contents of the exhaust gases.

Exhaust gas re-circulation arrangement

Abstract: In an exhaust gas re-circulation arrangement for a supercharged internal combustion engine including an exhaust gas turbocharger with an exhaust gas turbine and a compressor, first and second exhaust pipes extending from the engine separately to the exhaust gas turbine, a charge air duct extending from the compressor to the engine and an exhaust gas recirculation line extending from one of the exhaust pipes upstream of the exhaust gas turbine to the charge air duct downstream of the compressor, the exhaust gas turbine has two turbine inlet flow passages, which provide for different flow volumes and to each of which one of the exhaust pipes is connected and a control arrangement is provided for controlling the exhaust gas flow through the turbine inlet flow passages so as to control the pressure in the exhaust gas re-circulation line to be higher than in the charge air intake duct.

Method and apparatus for exhaust gas recirculation control and power augmentation in an internal combustion engine

Abstract: A system for controlling exhaust gas recirculation flow rates and power augmentation of a turbocharged internal combustion engine (20) operating on diesel fuel or other fuels. Exhaust gas from the engine's exhaust manifold (30) is used to drive the turbocharger (24). Exhaust gas exiting from the turbocharger (24) is directed through a filter trap (44). A first portion of the exhaust gas exiting the filter trap flows through an exhaust gas recirculation cooler (152) to provide a first input to an electronically controlled diverter valve (138). A mixed output of intake air and recirculated exhaust gas is directed from the diverter valve (138) to an electrically driven compressor (82) and then to the intake manifold (34) of the diesel engine (20). The combination of the electronically controlled diverter valve (138) and the electrically driven compressor (82) controls both the exhaust gas recirculation flow rates and smoke limited power output at speeds below the peak torque speed of the associated engine. Above peak torque speeds, the turbocharger (24) generally supplies all required intake air to the engine and the electrically driven compressor (82) supplies only recirculated exhaust gas to control NOx emissions from the engine.

Apparatus for and method of suppressing infrared radiation emitted from gas turbine engine

Abstract: An apparatus for and method of suppressing infrared radiation emitted from hot metal parts at the aft end of a gas turbine engine and from the exhaust gas plume thereof is provided and such apparatus comprises a dual purpose ejector vane assembly operatively attached to the engine for introducing cooling ambient air into the hot engine exhaust gases and hiding the hot metal parts. The vane assembly has a duct structure for receiving and confining the engine exhaust gases and the assembly provides at least one stream of cooling ambient air across one full dimension of the duct structure and exhaust gases confined thereby with the stream of cooling ambient air mixing with the hot engine exhaust gases across the full dimension of the duct structure to assure optimum mixing thereof.

Exhaust gas purification system of internal combustion engine

Abstract: An electronic control unit of an internal combustion engine calculates a basic post-injection quantity of temperature increasing means if a deposition quantity of particulate matters deposited on a diesel particulate filter (DPF) exceeds a predetermined value. Then, a final post-injection quantity is calculated by correcting the basic post-injection quantity based on a temperature correction value, which is calculated by multiplying a deviation between DPF upstream exhaust gas temperature and target temperature and past temperature correction values by feedback gains. The feedback gains are switched in accordance with a delay in an exhaust gas temperature change in a present operating state, based on an intake air quantity sensed by an air flow meter. Thus, response can be improved, while maintaining stability.