Pulse Air
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Pulse Air is a system used by American Motors and other manufacturers during the eighties and early nineties. It replaced the Air Induction Reactor or A.I.R. systems and other smog pump induced emission systems.
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[edit] Development
Pulse Air was a catalytic converter management system. It was considerably simpler and more efficient then using a smog pump to force air into the exhaust stream for several reasons:
- It did not require the added weight of a smog pump.
- It did not have the associated drag of a smog pump.
- It worked with lower pressures and did not create as much noise.
- It created less back pressure in the exhaust stream.
- It tracked demand without complicated management systems.
[edit] Operation
Two pipes were attached to the exhaust system, one upstream of the catalytic converter and one to an air distribution pipe within the catalytic converter. At various times in the engine cycle, valves on the pipes would open and allow operation. Another set of valves called reed valves would now allow one-way flow of air into the exhaust.
The reed valves are a thin strip of spring steel that are mounted to flex only to air flow into the exhaust. This is caused by the pulses in the exhaust stream created by the opening and closing of the exhaust valves. As they pass the opening they create a venturi effect and draw air in. When the pressure in the system is greater than the atmosphere, it pushes the reed closed and prevents exhaust from escaping. This causes a mild hum to come from the tube intakes.
The upstream and downstream tubes are allowed to operate when...
The tubes provide oxygen to facilitate complete combustion and allow the second part of the catalytic converter, the carbon monoxide to carbon dioxide reaction, to function properly.
[edit] See Also:
- Catalytic Converter
- Air Injection Reactior (A.I.R.) System
- Automobile Emissions Control
- American Motors
- AMC Computerized Engine Control
[edit] External Links
- Jeep Adventures Under the Hood A detailed guide on the CEC system and how to tune it
- American Motors Forum
- AMC Eagle Nest A forum dedicated to the AMC Eagle (Not the later Chrysler/Renault version)
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