Open and Closed Loop AFR Control

[@AndyWhittle_HowEFIworks]

Note that when I was in simple mode, I was getting .7 AFR swings. If your target AFR is 14.7, this would give a swing from about 14.4 to 15.1 AFR.

[@wazza33racer]

Im tuning a Delphi MT22 factory software..........it was setup from stock (Great Wall), to be in closed loop almost all the time. It explains why its acceleration was incredibly mediocre.

[@kikkegek]

thank you for the very clear video Andy . awesome!

[@AwesomeFinish]

Awesome info, thank you for taking the time to make these videos.

[@ToddDunning]

Outstanding.

[@etxeokpotroik]

Andy. A video based only on pid would be awesome

[@robbedoes1985]

Andy, did you also made a video about getting the PID values set up?

[@MrKentmotor]

for copy paste the PID link :)
sites.google.com/site/fpgaandco/pid

[@bigj7807]

Would pid be sufficient on a turbo race car with no cats or go with simple closed loop

[@towlie911]

Can you use PID control with cats? Is there sufficient swing?

[@paulmuller1518]

Andy thanks for the Vidios, You have a field "Engine Cycle" in Log Viewer. I use LogViewer MS do I need to upgrade to HD to get the field?

[@AndyWhittle_HowEFIworks]

See my video on setting up high speed logging. The required settings are in there. The MS version is fine to log that.

[@flappingflight8537]

In order to run in PID mode you must have wide band O2 sensor and ECU which is able to read it and PID is actually closed loop with PID optimization, am I right ?

[@AndyWhittle_HowEFIworks]

Yes

[@flappingflight8537]

@@AndyWhittle_HowEFIworks Thank you sir !

[@exidous6831]

Why do cats need a swinging afr?

[@AndyWhittle_HowEFIworks]

It has something to do with the chemistry of how a cat works. The exact reason is above my pay grade.

[@exidous6831]

@@AndyWhittle_HowEFIworks Fair enough. Thanks for the reply. I've been running no correction for a long time with cats. They still work fine but now I'm concerned about longevity. Dual high flow metallic magnaflows. If it's just about efficiency then I'm good. Still pass the sniffer.
Any chance at a PID video for EGO and idle?

[@flappingflight8537]

@@exidous6831 they do not need it actually but when the whole system was invented the only lambda sensors available was the narrow band one and because of their reaction ( they shows only lean or reach mixture ) all the algorithm with short and long term trims was created around that behavior of narrow band lambdas . Catalytic converters work perfectly with stoichiometric mixture but since the the lack of fast reaction times and two position output of the narrow band lambdas the air/fuel ratio oscillate around the stoichiometric one . The oscillations must be fast enough and the periods when the lambda read reach and lean to be equal in order the average premixed a little bit lean and a little bit reach exhaust gasses before the catalytic converter to be as much stoichiometric as possible .Here one good video on catalytic converters th-cam.com/video/HADOcrcMikA/w-d-xo.html
BTW narrow band lambda ,catalytic converters and ECUs was used even in the pre fuel injection era , on so called electronically controlled carburetors which was a predecessors of mono injection systems .

[@alikengi17]

Needs more d and maybe a little less i ;p