Patent ID: 6192861
Filing Date: 2001-02-27
Classification: F02P

Abstract:
An engine ignition device for igniting a fuel-air mixture supplied to an engine by emitting sparks to the fuel-air mixture by igniting means, the engine ignition device comprising:a rotation detector for detecting a rotation of an output shaft of the engine at each predetermined rotational angle and for outputting a detection signal changed in response to a rotational speed of the output shaft; anda timing controller for changing an operating timing of the igniting means in accordance with the detection signal and for operating the igniting means in accordance with the changed operating timing;wherein the rotation detector includes a protrusion in a flywheel on the output shaft and a magnetic pickup adjacent to a revolution locus of the protrusion, the magnetic pickup detecting a passage of the protrusion when the protrusion passes near the magnetic pickup, the magnetic pickup outputting a detection signal having a maximum value changed in proportion to a passing speed of the protrusion, and the timing controller includes a comparator circuit for operating the igniting means when a detection signal outputted from the magnetic pickup with the passage of the protrusion is larger than a predetermined threshold value.