The authors have designed the electronically controlled fuel injection system which is suitable for a small general purpose gasoline engine.
This system regulates the supply of fuel very precisely to suit instantaneous running condition of the engine. To the fuel injector fuel is supplied at a constant pressure 2kg/cm². Fuel is sprayed into the intake manifold only when the magnet valve of the fuel injector is opened by a solenoid. The duration of the fuel injector openning is equal to the width of the pulse of electric supplied to the solenoid. The width of the pulse is determined by electronic circuit, which is controlled basically by the absolute pressure in the intake manifold and modified by the speed of the engine and the temperature of the cylinder head.
By means of this injection system, it has been possible to reduce the fuel consumption and authors expect to reduce the air pollution by the exhaust gas and to improve the respones-characteristics of the engine.