Fuel supply system for internal combustion engine using an ultrasonic

Abstract

In a fuel supply system for internal combustion engine provided with a fuel injection valve and an ultrasonic atomizer on suction pipe of the engine, the tip of the oscillator member of said ultrasonic atomizer is furnished with an inclined portion and a portion with reduced portion further ahead of said inclined portion. By arranging a fuel supply passage face-to-face to this inclined portion, the shape of the oscillator tip is modified, and it is possible to maintain adequate atomizing angle regardless of the quantity of supply fuel without attaching the fuel on inner wall of inlet pipe, to increase the turndown ratio and to achieve even spraying all over the circumference. Also, it is possible to shorten the starting time when external air temperature is low and to increase the combustion performance and the exhaust property, particularly, in an engine using the fuel difficult to ignite at low temperature such as alcohol, kerosene, etc.