Closed/Open Loop

Corey & Alicia Beaverson cbeavers at utk.edu
Fri Oct 3 20:46:54 GMT 1997


Can someone tell me how often a particular efi system will go into
closed loop on say, an "average" drive or whatever. Does it vary a whole
lot from manufacturer to manufacturer? And when the system is in open
loop,....is this when a stored fuel map is used to set the a/f ratio? If
so, are there alot of different fuel maps stored in the ecu for varying
conditions i.e. WOT, startup, cold engine and etc?
On a different note,  when a system is in closed loop, how often does
the ecu get a value from the O2 sensor on the "average system". Also is
it safe to say that when in closed loop, the ecu will do everything
possible to keep the a/f ratio at a predetermined value or not?
Many thanks in advance....




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