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.

Pressure boosted IC engine with exhaust gas recirculation

Abstract: A method and apparatus for boosting the pressure of the air charge to an internal combustion engine, which has an exhaust gas recirculation (EGR) system and a turbocharger. The EGR system is arranged to recirculate exhaust gas from an engine exhaust outlet passage to the engine air inlet passage. An exhaust gas bypass passage arranged to divert exhaust gas that would otherwise reach the turbocharger's impeller. The engine has a single, unitary control valve with a valve inlet arranged to receive exhaust gas from the engine exhaust outlet passage, and three valve outlets. A first of said valve outlets provides exhaust gas to the EGR system for recirculation to the engine air inlet passage, a second of said valve outlets provides exhaust gas to the exhaust gas bypass passage and a third of said outlets provides exhaust gas to the impeller.

System for regenerating a particle filter in a diesel engine exhaust pipe

Abstract: The injection (6) of additional fuel into the engine cylinder (1) during expansion increases the hydrocarbon and carbon monoxide present in the exhaust (2). This produces an exothermic reaction in an oxidation catalyst (8) upstream of the filter (4), thus providing the heat to burn particles off the filter and help to regenerate it. System for helping regeneration of a particle filter (4) fitted into an exhaust pipe (2) for a diesel engine (1), in particular for a vehicle engine. The particle filter is connected to an oxidation catalyst (8) to assist in regeneration, fitted upstream of the filter in the exhaust pipe. Means (5, 6, 7) of injecting an additional quantity of fuel into at least certain engine cylinders, after the main injection and during expansion, causes an increase in the hydrocarbon and carbon monoxide fraction of the exhaust gases to activate the catalyst and start the regeneration of the filter by increasing the temperature of the gases entering the filter after passage through the catalyst. The timing of the injection is calibrated to obtain a required temperature on exit from the cylinders. The means of injection include electrically controlled injectors (6) connected to the cylinders, and are fed by a fuel supply (5) common to all the injectors. The means of injection also have a central unit (7) for data collection and injector control.

Exhaust gas recirculation method for an internal combustion engine

Abstract: A system and method for recirculating exhaust gas in a turbocharged internal combustion engine is disclosed. The disclosed method comprises the steps of: (a) recirculating a selected volume of exhaust gas from the exhaust manifold to the intake manifold via a recirculation conduit; (b) diverting a flow of cool intake air to bypass the engine via a bypass conduit; and (c) cooling the recirculating exhaust gas in the recirculation conduit using the flow of diverted intake air.

Method and system for vacuum control

Abstract: Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust throttle and an EGR valve to expedite catalyst heating By closing both valves during an engine cold start, an elevated exhaust backpressure and increased heat rejection at an EGR cooler can be synergistically used to warm each of an engine and an exhaust catalyst The valves may also be controlled to vary an amount of exhaust flowing through an exhaust venturi so as to meet engine vacuum needs while providing a desired amount of engine EGR