IGNITION TIMING PULSE GENERATOR FOR A CONTACTLESS IGNITION SYSTEM OF INTERNAL COMBUSTION ENGINES

摘要

An ignition timing pulse generator for use in a contactless ignition system of an internal combustion engine which includes a magnetodynamo. The pulse generator includes a pair of auxiliary timing poles secured to main magnet poles of the magnetodynamo and disposed to oppose each other and to thereby define an airgap therebetween. Pickup means are also provided and are mounted on the stator of the magnetodynamo with the pickup means including a pickup core shielded by at least one magnetic shielding member and a first pickup coil wound on the pickup core. A second pickup coil is wound on said magnetic shielding member with the first pickup coil being differentially connected to the second pickup coil to produce an ignition timing pulse substantially without any disturbance from stray fields in response to passage of the airgap between the pair of timing poles when the rotor is rotated.