Abstract: The ignition unit includes a support housing containing two ignition coils each for the connection to at least one, and preferably two, associated spark plugs. Each ignition coil comprises a primary winding and a second winding disposed around the end arms of a magnetic core or circuit formed by only two packs of plates juxtaposed so that together they form essentially a figure-of-8 shape. The packs of plates are identical, essentially E-shaped and are placed close together, face-to-face, so that together they form a squared figure-of-8 shape. Each of the packs of plates has a notch which extends from the back of the E into its central arm and almost up to the end of the free end thereof. Conveniently, inserts of non-magnetic material are disposed in the notches in the packs of plates.

Abstract: Apparatus for generating a plurality of pilot signals is disclosed. First and second sets of timers are fed by a common system clock. Each timer of both the first and second sets of timers is adapted to generate a gating pulse a predetermined time period after the initiation of a timing cycle in accordance with a timing characteristic peculiar to each timer. The timing characteristic of the timers in both the first and second sets are chosen such that at least one of the timers in the first set generates a gating pulse at the same time that at least one of the timers in the second set generates a gating pulse. The gating signals generated by each of the first set of timers are applied to one input of each of a plurality of two input pilot signal gates. The gating signal generated by each of the second set of timers is applied to the remaining input of a different one of the plurality of two input pilot signal gates.

Abstract: A system utilizing a single sensor for locating angular positions of a rotating member relative to an angular reference position is provided with means which, for each revolution of the rotating member, generates a bipolar reference signal at the reference position and a bipolar position signal of reversed polarity from the bipolar reference signal. At the second half waves of the bipolar reference and position signals respective unidirectional reference and position signals are generated. The latter are converted to logic signals corresponding to angular positions of the rotating member relative to the reference position and the unidirectional reference signals are utilized to control cycle repetition.