High performance ignition circuit

Abstract

There is disclosed an ignition system for a multicylinder internal combustion engine which employs a conventional Kettering ignition coil and a pulse generator such as an induced voltage coil operating in cooperation with a magnetic circuit driven in timed relationship to the engine for generating a train of voltage pulses in synchronism wih the engine. The circuit of the invention includes a circuit across a source of electrical energy and the primary windings of the ignition coil with an electronic switch therein and with a high frequency pass filter in circuit between the induction coil and the electronic switch of the primary windings circuit to pass only the high frequency voltage pulses that are responsive to the inflection point of the cyclic voltage induced in the induction coil. The high pass filter is preferably a tuned RC circuit operative to effect pulse shaping of the train of induced voltage pulses to a train of sharp peak voltage pulses of minimal time and duration. The train of shaped voltage pulses is applied to bias the electronic switch of the primary coil windings momentarily into nonconduction, thereby achieving extremely rapid collapse of the ignition coil magnetic field and generating maximum high voltage pulses in the ignition coil secondary windings throughout engine speeds up to 10,000 revolutions per minute and greater.

Dependencies are inferred from the claim text.