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.

Method for controlling an exhaust gas temperature of an engine for improved performance of exhaust aftertreatment systems

Abstract: A method for regenerating a particulate filter communicating with exhaust gases of an internal combustion engine 12 is provided. The method includes indicating that the particulate filter 48 needs to be regenerated. The method further includes adjusting the throttle valve 18 to decrease an amount of air inducted into one of the engine cylinders to increase a temperature of the exhaust gases while maintaining an engine speed above a predetermined engine speed. The method further includes increasing the speed of the engine 12 and injecting a predetermined amount of fuel into one of said cylinders late in a power stroke of the cylinder to further increase the temperature of the exhaust gases to regenerate the filter 48.

Variable displacement closed loop fuel controlled internal combustion engine

Abstract: An internal combustion engine operable in variable displacement modes is provided with separate exhaust systems for individual cylinder groups and a set of exhaust gas sensor and catalytic converter for each exhaust system. An electronic fuel injection control unit is arranged to respond to one of the signals from the gas sensor which is indicative of mixture richer than the other to effect correction of the duration of fuel injection pulse. Each catalytic converter is provided with a temperature sensor to detect when the temperature therein falls below the normal catalytic reaction temperture. A variable displacement control unit responds to the output from the temperature sensors by alternately deactivating the cylinder groups during low power operation.

Stoichiometric combustion with exhaust gas recirculation and direct contact cooler

Abstract: Methods and systems for low emission power generation in hydrocarbon recovery processes are provided. One system includes a gas turbine system configured to stoichiometrically combust a compressed oxidant and a fuel in the presence of a compressed recycle exhaust gas and expand the discharge in an expander to generate a gaseous exhaust stream and drive a main compressor. A boost compressor can receive and increase the pressure of the gaseous exhaust stream and inject it into an evaporative cooling tower configured to use an exhaust nitrogen gas having a low relative humidity as an evaporative cooling media. The cooled gaseous exhaust stream is then compressed and recirculated through the system as a diluent to moderate the temperature of the stoichiometric combustion.

Air-fuel ratio control system for internal combustion engines

Abstract: There is provided an air-fuel ratio control system for internal combustion engines wherein the direction of deviation of the actual air-fuel ratio from a preset air-fuel ratio is determined by an oxygen concentration detector for detecting the concentration of oxygen contained in the exhaust gases from an internal combustion engine and an air-fuel ratio discriminating circuit, whereby air is injected from an air injection valve when the air-fuel ratio is low i.e. the mixture is rich and fuel is injected from a fuel injection valve when the air-fuel ratio is high i.e. the mixture is lean, thereby controlling the air-fuel ratio to a predetermined value.