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.

Containers for catalysts for exhaust emission control

Abstract: In a can-like container for a cylindrical metal or ceramic substrate body for a catalyst for exhaust emission control, a locating element within the can at least at one end of the body has prongs which, on assembly of the can around the body, are forced into the end face of the body to prevent rotation of the body within the can during subsequent use.

Device for reducing a level of nitrogen oxides in an exhaust gas of an internal combustion engine

Abstract: The device is configured to catalytically reduce internal combustion engine exhaust gases which contain nitrogen oxides. The device has an exhaust pipe, one end of which can be connected to at least one exhaust outlet of the internal combustion engine. A reducing agent, in particular urea, is introduced into the exhaust pipe with a feed device. At least one mixer is arranged downstream of the reducing agent injection, as seen in the flow direction of the exhaust gas. The mixer has a multiplicity of passages through which the fluid can flow. At least one catalytic converter is arranged downstream of the mixer. At least one diffuser is located between the mixer and the converter. The diffuser which has a multiplicity of passages through which the exhaust gas can flow and which have a cross section which increases in the flow direction.

System for estimating NOx content of exhaust gas produced by an internal combustion engine

Abstract: A system for estimating NOx content of exhaust gas produced by an internal combustion engine includes a control computer operable to estimate an exhaust temperature corresponding to temperature of exhaust gas produced by the engine, to determine an EGR fraction corresponding to a fractional amount of recirculated exhaust gas present in an air charge supplied to the engine, and to estimate an emissions index, corresponding to a fuel rate normalized, mass-based NOx concentration of the exhaust gas produced by the engine, as a function of the exhaust temperature and the EGR fraction. The control computer is further operable to determine a mass flow rate of fresh air entering the intake manifold and a fuel mass flow rate, and estimate the NOx content by volume of the exhaust gas produced by the engine as a function of charge mass flow value, the fuel mass flow value and the emissions index value.

Distribution type fuel injection apparatus

Abstract: A distribution type fuel injection apparatus has a fuel injection pump having a solenoid valve for controlling pressure of a high-pressure chamber of the apparatus. The solenoid valve is actuated or deactuated at the optimum time for fuel injection end or beginning by a control signal produced by a circuit for computing the optimum timing in accordance with the condition of engine operation. Thus, precise control of injection timing or injection amount injected can be attained by electronic control without a complex mechanical structure.

Method and apparatus for reducing oxides of nitrogen in the exhaust gas of an internal combustion engine

Abstract: A method and apparatus for reducing oxides of nitrogen in the exhaust of an internal combustion engine. The apparatus includes a pressurizing unit for providing compressed air to a pressure swing adsorption unit. The pressure swing adsorption removes nitrogen from the air to produce nitrogen-reduced air, which is then supplied to the engine. The pressurizing unit may be a compressor, a turbocharger, or a supercharger. The engine may utilize exhaust gas recirculation and fuel injection with air assist.