Abstract:
A generator and triggering mechanism for an electronic ignition system of an internal combustion engine in which the mechanism has one magnetic circuit which charges an energy storage device and which is discharged in response to periodic rotational positions of the engine shaft by which the generator is driven. Integral and relatively rotatable with the generator, the mechanism includes a second magnetic circuit comprising a triggering coil and pole piece disposed in offset axial relationship to the magnetic circuit of the generator and with a ferromagnetic disc interposed between the generator circuit and the triggering elements whereby the trigger coil is shielded from stray flux lines of the first magnetic circuit.
Abstract:
In a breakerless ignition system for a spark ignited engine, two separate magnets are used for generating the electrical energy supplied to the spark plug and for generating triggering signals applied to an electronic switch controlling the application of electrical energy to the spark plug. The system is a condenser discharge system wherein a main rotating magnet assembly generates a varying voltage in a generating coil positioned adjacent its path of movement. A condenser is connected with the generating coil through a rectifying means so as to be charged when the voltage induced in the generating coil is of one polarity. A silicon controlled rectifier controls the discharge of the condenser through the primary of a step-up transformer having its secondary winding connected to the spark plug. Triggering signals for the silicon controlled rectifier are provided by a separate stationary triggering magnet and coil assembly. A rotating piece of magnetic material moves past the triggering magnet and coil assembly to induce a triggering voltage in the triggering coil, the magnitude of which at different positions of the rotating piece is dependent on the speed of rotation so that at different engine speeds the triggering level of voltage is obtained at different positions of the rotating part to provide an automatic spark advance.