gez bay
Member
Registered: 14th Feb 08
Location: South Wales drives: Vxr
User status: Offline
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basically, can someone explain to me what 'closed loop fueling' is?
Cheers in advance.
Gez 
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Ryan_G1
Member
Registered: 29th Aug 05
Location: East Ayrshire
User status: Offline
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In closed loop operation the ECU uses one or more oxygen sensors as a feedback loop in order to adjust the fuel mixture. This gives the name ‘closed loop’ from the closed feedback loop. The ECU won’t run in a closed feedback loop all the time, so ‘open loop’ is used to describe the operation of the ECU when the mixture is not being adjusted in this way (usually when the engine is cold or when running under high load).
In closed loop operation the ECU uses the oxygen sensor to tell if the fuel mixture is rich or lean. However, due to the characteristics of the oxygen sensor it can’t tell exactly how rich or lean, it only knows that the mixture is richer or leaner than optimum. The ECU will enrich the mixture if the oxygen sensor shows that the mixture is lean, and lean the mixture if it looks rich. The result of this is that the mixture will swing back and forward around the stoichiometric point.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Offline
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It means if you make changes to the fuelling, you use sensors to see the effect that has, and make further changes based on the readings from those sensors.
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gez bay
Member
Registered: 14th Feb 08
Location: South Wales drives: Vxr
User status: Offline
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cheers
[Edited on 10-12-2010 by gez bay]
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