Sem Ab

Aktiebolaget Svenska Elektromagneter

Nils A Agren

Rolf L Rask

Lars-Olof Ottosson

The invention relates to an apparatus for controlling the triggering sequence in capacitive ignition systems for internal combustion engines. The induction achieved by a flywheel magneto usually results in three voltage wave halves, of which two (A,B) have one polarity and an intermediate one (C) has an opposite polarity. In the present case, the first voltage halfwave (A) is used for triggering voltage and the subsequent halfwave with opposite polarity (C) for the charging voltage. The subsequent last voltage halfwave is suppressed (B') to a level below the triggering level. This is achieved by arranging an inhibiting circuit (11-15) for the conventional triggering circuit (8,9,10) by charging (11) a further capacitor (12) during the charging phase itself, the capacitor (12) maintaining control voltage for a further thyristor (15) or triac, which is arranged to short-circuit the triggering voltage.

Apparatus for controlling the trigger sequence in ignition systems

A method of winding coils in one and the same wire size, so that they can be tailored to prevailing circuit requirements, includes, for example, when a lower resistance is required, a partial winding is first wound in one direction from a first connection to a second connection, the wire then being wound from the second connection in the opposite direction for joining to the first connection.

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.ANG.m.ang.l, Sweden

Nils A Agren