secondary air

secondary air
In some exhaust emission control systems, e.g., thermal reactor or two-bed converter, secondary (outside) air is added to the exhaust to ensure sufficient supply of oxygen to promote oxidation of HC and CO, thus converting these pollutants into harmless water vapor and carbon dioxide

Dictionary of automotive terms. 2015.

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  • Secondary air injection — Theory and origins= Secondary air injection (commonly air injection, colloquially smog pump, trademark Air Injection Reactor) is an automobile emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream.… …   Wikipedia

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  • air — [1] Abbreviation for air conditioner. [2] A bicycling or motorcycling term describing the space or gap between the tires and the ground when the bike takes a jump. Both tires must be off the ground before it can be called air as in the expression …   Dictionary of automotive terms

  • air gulp system — A system in vehicles with secondary air injection or induction, which prevents an very rich mixture of air fuel from entering the inlet manifold during deceleration. If it did enter, unburned fuel would be forced over the hot exhaust system… …   Dictionary of automotive terms

  • air select valve — A valve in a two stage catalytic converter with secondary air injection. It is operated by a solenoid and is triggered by the electronic control module. It directs air to the exhaust valve ports or to the midbed catalytic converter, depending on… …   Dictionary of automotive terms

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  • air injection manifold — The duct inside the cylinder head or the tube outside the cylinder head feeding secondary air into the exhaust ports …   Dictionary of automotive terms

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  • Air pollution — from World War II production Smog over …   Wikipedia

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