Method for controlling an injector with verification that plunger movement has occurred
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsMichele Cagnoni, Fausto Calcagno
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Abstract
A method for controlling an injector with verification that plunger movement has occurred; the method providing application of a time-variable voltage to the terminals of an injector drive circuit in order to cause a current wave to flow through said drive circuit; detection of a verification voltage between the terminals of the drive circuit once the current through the drive circuit has died away at the end of the injection phase, measurement of a verification time during which the verification voltage is greater than a first predetermined threshold value and diagnosis of the absence of plunger movement if the verification time is less than a second predetermined threshold value.
Claims8
Method for controlling an injector (2) with verification that plunger movement has occurred;
- the method providing application of a time-variable voltage (Vinj) to the terminals (5, 6) of a drive circuit (4) of the injector (2) in order to cause a current wave (Iinj) to flow through said drive circuit (4);
- the method being characterised by detection of a verification voltage (Vv) between the terminals (5, 6) of the drive circuit (4) once the current (Iinj) through the drive circuit (4) has died away at the end of the injection phase, measurement of a verification time (Tv) during which the verification voltage (Vv) is greater than a first predetermined threshold value (SVv) and diagnosis of the absence of plunger movement if the verification time (Tv) is less than a second predetermined threshold value (STv).
Dependencies are inferred from the claim text.