Figure 8.39 shows the main components of the Mono Jetronic system. The
component most noticeable by its absence is an air ow sensor which is not
used by this system. Air mass and load are calculated from the throttle position
sensor, engine speed and air intake temperature. This is sometimes known
as the speed density method. At a known engine speed with a known throttle
opening, the engine will ‘consume’ a known volume of air. If the air temperature
is known then the air mass can be calculated.
The basic injection quantity is generated in the ECU as a function of engine
speed and throttle position. A ROM chip, represented by ...
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