PURPOSE: To make proper increase of fuel easily in a wide rate-of-flow range with an aux. fuel supply device of a carburettor by opening and closing a fuel control valve and an air control valve according to the duty ratio.
CONSTITUTION: Aux. fuel passage 5 is furnished with a fuel pump 6, pressure adjuster 7 on its discharge side, solenoid driven fuel control valve 8, and a jet 9 in the sequence as named. Downstream the jet 9 an air passage 10 is connected with this aux. fuel passage 5 and on the way equipped with a solenoid driven air control valve 11 and a jet 12. An electronic control circuit 13 receives input of parameters for the engine operating condition and emits appropriate drive signals. The fuel control valve 8 and air control valve 11 are opened and closed by drive signals consisting of pulse wave in specified duty ratio sent individually from the electronic control circuit 13.
Ishikawa, Norikazu
Asada, Tetsuo
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