Fabbrica Italiana Magneti Marelli, S.p.a.

Fiat Societa Per Azioni

Mauro Maioglio

Rafael Jacoel

Umberto Bigliani

Spark advance apparatus for an internal combustion engine utilizes an electronic counter circuit to count pulses generated at a rate proportional to engine speed and also utilizes a device energized by the counter circuit to control the charging time of the ignition coil. The counter circuit includes a first counter that is active until a first count is reached. Thereafter, a second counter of the counter circuit counts a predetermined number of pulses occurring at a frequency relates to a particular engine parameter. The device to control charging of the coil is activated at the end of the count by the second counter.

Spark advance apparatus for controlling the ignition instant of a spark

A solid state ignition system for an internal combustion engine is controlled by a spark advance means in relation to one or more parameters affecting spark quality. Supply battery voltage is monitored by the spark advance means whereby the latter generates control signals that regulate primary ignition current so that the latter attains a predetermined level before primary ignition current is interrupted.

Spark advance system for internal combustion engines comprising a device

A device for automatically varying the ignition spark advance angle in an electronically controlled ignition system for an internal combustion engine, in which there is a first sensor for producing a train of pulses the pulse repetition frequency of which represents the engine speed and a second sensor for producing a single pulse once each revolution of the engine when the crankshaft is at the top dead center position. A pulse counter counts the pulses from the first sensor and acts to discharge the ignition spark when it reaches a predetermined count: this counter is reset to zero each cycle by the pulse from the second sensor, there is also a timing device which sets a predetermined time interval in advance of the top dead center position and means for doubling the frequency of the pulses counted by the said counter for varying the rate at which the spark advance angle varies with change in speed of the engine, depending on whether the engine speed is above or below a threshold speed determined by the timing interval of the said timing circuit.

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Turin, Italy

Mauro Maioglio