(57) The invention relates to an ignition system, particularly of the static-distribution
type, in which a respective ignition coil (C) with a primary winding (5) and a secondary
winding (6) is coupled to the sparking plug (SP) associated with each cylinder. The
system includes a respective switching transistor (T) for each ignition coil (C) and
control circuit devices (4, 7 -11) which, in order to generate a spark in a plug (SP),
cause a first switching of the corresponding transistor (T) from the shut-off condition
to the conducting condition to start the flow of current in the primary winding
(5) of the associated coil (C), and a second switching to the shut-off condition
to stop the flow of current in the coil (C), causing the striking of the spark. These
control circuit devices (4, 7 - 11) are arranged to control the speed of the first
switching of the transistor or transistors (T) concerned from time to time, for each
ignition, so that the first switching takes place gradually at a speed less than a
predetermined value. The amplitude of the voltage peak which is applied to the sparking
plug (SP) in correspondence with the first switching is thus drastically reduced.
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