Fuel injection system for an internal combustion engine, and an engine provided with such a system.

摘要

A fuel injection system for an internal combustion engine (1) including a fuel injection valve (5) for injecting fuel under pressure into an intake pipe (3) of the engine. The system includes a flow meter (4) for generating an output signal dependent on the intake air flow rate of the engine (1) and an injection valve drive means (6) for opening the fuel injection valve (5) for a predetermined period at a frequency determined by the output signal to effect proper fuel injection. A pressure regulating device (14) is provided for holding substantially at a preset value the difference between the pressure of the fuel in a supply chamber (14a) for being fed to the fuel injection valve (5) and the pressure in the intake pipe (3). An electronic control means (32) is provided for controlling the preset valve in accordance with the running state of the engine.