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ENGINE <NON-TURBO>
-
Control System
Fuel System Monitor
Background
To control the level of undesirable emissions, the
fuel system must be able to maintain strict control
of the air/fuel ratio. Stoichiometry is the optimum
air/fuel ratio, which is 14.7 to 1. At this point the
best balance between the production of
HC’s
and
CO’s (which drop as the mixture becomes leaner)
and
NOx
(which increases as the air/fuel mix
be-
N71AK43AA
comes leaner) can be found. This is also the point
where the catalytic converter is most efficient at
converting all three gases to less harmful
com-
pounds. The goal of the PCM is to examine input
information and control outputs to produce a
constant stoichiometric ratio.
80-
80-
i/j
14:l
15:l
18:l
Air/fuel ratio
AFuOO91
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