Joint International Conference on Long-term Experiments ...

Mixture quality estimate is done frequently by air excess coefficient x, definite by report
χ=L/Lo, where L means air quantity which is available for burning one kilo fuel, and Lo
is minimum quantity of air available to burn one kilo fuel.
For theoretic dosage χ=1, for poorest one χ>1 and for the richest χ=1.
Block scheme of general model used modulate gasoline injection system of M.A.S. is
presented by figure 1 [3].
Figure 1: Block scheme of general model used modelling gasoline injection
system of engines spark ignition
It includes correlation system of aspirated air by engine with a quantity of gasoline
injected on cycle.
Entering magnitudes into the system are x load, n rotation, angular speed, position
of obdurate and the emergence one are effective moment, effective efficiency, effective
consummation, polluting emission. Engine process is influenced by thermal system of T
engine.
Following the study made for many different fuel injection systems it can be
noticed that every system no matter that it is a mechanic or electric one, they have basic
scheme, based on internal burning engine working. Mechanic systems have on their
principle scheme base two circuits: fuel circuit, air circuit and: suitable correction.
Electronic systems includes, beside that, the electric circuit and firing circuit for
Motronic system [4]. The main injection equipment load is correlating air quantity
aspirated by the engine with quantity of injected fuel on the cycle, such that may result
the best dosage every engine working system. That can be possible with correlation
between air and fuel quantities and a series of engine working parameters (air, pressure,
into the collecting input obturater position), engine rotation [1]; [5].
Figure 2 represents three dimensional variations effective power of 106-20 engine
with Bosh Mono-Motronic MA 1.7 gasoline injection and, figure 3 represents three
dimensional variation of specific effective fuel consume of the same typo of engine, fit
with the same injection system.
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