Industrial Technology Research Institute

Guey-Fa Chi

Duen-Jen Cheng

Ying-Cheun Spring Yeh

An ignition distributor of an automotive vehicle has a magnetic pick-up device mounted in the housing of the ignition distributor and including a magnetoresistor. The magnetoresistor is electrically connected to a primary ignition circuit in the ignition coil, which produces a high voltage when said magnetic pick-up device produces a voltage pulse output signal. A permanent magnetic plate is attached to the magnetoresistor and provides a magnetic field perpendicular to the direction of the current flow through the magnetoresistor. When each of the teeth of an armature rotated with the distributor shaft mounted in the ignition distributor passes the magnetic pick-up device to change temporarily the magnetic field applied to the magnetoresistor, the resistance of the magnetoresistor is correspondingly varied so that said magnetoresistor can produce a voltage pulse by the magnetoresistance effect, and open and close the primary ignition circuit for firing the spark plugs.

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Hsinchu, Taiwan

Guey-Fa Chi