Electronic fuel injection system in an internal combustion engine

摘要

This application discloses an electronic fuel injection system in an internal combustion engine. The system comprises: a fuel injector arranged on an intake pipe of the engine; a fuel control circuit for supplying fuel through said injector in response to the intake air quantity of the engine; an intake air flow meter electrically connected to said fuel control circuit; a pressure detector arranged in the intake manifold, said detector being electrically connected to said fuel control circuit; and an engine revolutional speed sensor electrically connected to said fuel control circuit; said fuel control circuit including: a comparing circuit which compares the intake air quantity with a predetermined value; a first control circuit which actuates said fuel injector in response to the output signals of said intake air flow meter and said engine revolutional speed sensor; and a second control circuit which actuates said fuel injector in response to the output signals of said pressure detector and said engine revolutional speed sensor, wherein said fuel control circuit comprises a selecting circuit which selects said first control circuit when the intake air quantity is below the predetermined value, and said second control circuit when the intake air quantity is above the predetermined value.