Process for determining the film of fuel deposited on the intake manifold of electroinjector engines with controlled ignition
AssigneeEuron S.p.A.
InventorsAgostino Frigoli, Giovanni Livraghi, Mauro Miorali
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Abstract
Process for the quantitative determination of gasoline film deposited on the intake manifold of an engine with controlled ignition, which comprises the following steps: a) feeding of a first set of injectors (I) with a first fuel selected from those which do not leave deposits in the feeding manifold; b) opening of the second set of injectors (II) fed with a second fuel to be tested, until an equilibrium stage of the air/fuel ratio equal to that of step (a) is reached; c) calculation of the mass of fuel film by integrating the difference in the flow-rate values measured in step (b).
Claims7
A process for the quantitative determination of gasoline film (or its components) deposited on the intake manifold of a controlled ignition engine using two sets of injectors (I) and (II), which comprises the following steps:
- a) feeding, at a preset air/fuel ratio, a first set of injectors (I) with a first fuel selected from those which do not leave deposits in the feeding manifold;
- during the feeding of the first set of injectors (I), the second set of injectors (II) being inactive;
- b) interruption of the first set of injectors (I) and simultaneous opening of the second set of injectors (II) fed with a second fuel to be tested, until an equilibrium stage of the air/fuel ratio is reached which is equal to that of step (a);
- during the above step (b) measurements being taken of the in-going air flow-rate (A.sub.i) and the A.sub.i /F.sub.i ratio of the exhaust gas, wherein F.sub.i is the flow-rate of fuel which actually enters the combustion chamber, i being the i-th time;
- c) calculation of the mass of fuel film by integration of the difference of the flow-rate values measured in step (b);
- steps (a) and (b) possibly being carried out inversely.
A system for the determination of the film of fuel deposited by a fuel, preferably gasoline, on the intake manifold of an engine with controlled ignition (SI engine) which, with reference to FIG. 1, comprises:
- a) SI engine equipped with two sets of injectors, (1) and (2), the first (1) fed with a first fuel which does not leave deposits, the second set (2) fed with the fuel under examination;
- b) devices (6) for measuring the air flow-rate;
- c) devices (3) for switching the feeding fuel and consequently the injection set;
- d) control systems (4) of the two injector sets, each equipped with its own feeding system, independent of each other;
- e) memory emulators (8), computers (7) interfaced with each of the two control systems;
- the opening and closing times of the injector sets (1) and (2) being programmed in the above computers by means of timing activators (9);
- f) several UEGO probes (5) situated on the exhaust pipe, for monitoring the titer (or air/fuel ratio) of the combustion mixture.
Dependencies are inferred from the claim text.