F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
328/114.2, 317/5
F02P 3/04 (2006.01) F02P 7/03 (2006.01) F02P 7/073 (2006.01) F02B 1/04 (2006.01)
Patent
CA 1112715
ABSTRACT OF THE DISCLOSURE A breakerless distributor for an internal combustion engine ignition system in which a number of light emitting diodes (LEDs) equal to the number of engine cylinders are connected in series for simultaneous energization by the timing pulses. A phototransistor arranged in spaced, con- fronting relationship to each LED is connected to a silicon controlled rectifier which triggers the energizing circuit for an individual spark plug each time the phototransistor is turned on by emissions from its associated LED. The LEDs and photo- transistors are arranged in concentric circles on a printed circuit board with the angular distance between pairs of LEDs and phototransistors equal to the firing angle. A slot in the wall of a cup member mounted for rotation between the LEDs and phototransistors allows only one phototransistor, and therefore one spark plug, to be energized per timing pulse as the cup member is driven in synchronism with the rotation of the motor. Full timing advance can be accomodated even at small firing angles by increasing the angular width of the slot in the cup member. For very small or irregular firing angles, additional pairs of LEDs and phototransistors are arranged in another pair of concentric circles with a second slotted cup for controlling sequential turn on of the additional phototransistors. As an alternative to placing the LEDs and phototransistors in con- centric circles, they may be arranged in axially displaced circles with an intervening slotted disc in place of the slotted cup. Apparatus is also disclosed to prevent multiple spark plug firing due to radio frequency interference and for generating suitable firing pulses from a magnetic pickup at high speeds and small firing angles.
321002
Bendix Corporation (the)
Macrae & Co.
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