Device for detecting premature ignition in an internal-combustion engine
AssigneeAlfa Romeo S.p.A.
InventorsEdoardo Rogora, Giancarlo De Angelis
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Abstract
A pre-ignition detecting device for an internal-combustion is disclosed, which belongs to the general type of ionization-detectors, but employs no supplementary probe near the spark plug(s). The device is electronic and comprises a circuitry in which a switching stage is capable of discriminating the signals indicating ionization at the electrodes in the cases in which the contact-breaker is open from those indicating ionization in the opposite case, that is, when pre-ignition occurs. Display devices can visualize the pre-ignition ripples and an operative stage could actuate, if so desired, the advance of ignition control in order to restore the engine to its normal run whenever necessary.
Claims4
A device for detecting the pre-ignition in an internal-combustion engine having a controlled ignition, which is connected to the ignition system of the same engine, said ignition system comprising circuit means for controlling cyclically the sparking at each plug of the engine with an ignition advance variable as a function of the working condition of the same engine, said device comprising first means operatively connected to at least one of the spark plugs of the engine adapted to generate signals indicative of the state of conduction of the same plug, that is of the ionization between its electrodes, the device being characterized in that it comprises second means operatively connected to said circuit means, adapted to detect the operative state of the same plug and adapted to generate signals indicative of the sparking at the plug, and further comprising switching means operatively connected to said first and second means, adapted to generate signals as a function of the signal delivered by said first means exclusively when no signals are generated by said second means.
Dependencies are inferred from the claim text.