Fuel supply system for engines with fuel pressure control

A fuel supply system of an internal combustion engine for feeding, under pressure, fuel stored inside a fuel tank by means of a fuel pump to an injector through a fuel pipe and a fuel filter and injecting the fuel to the internal combustion engine from the injector, the system comprising:

• a speed variable driving means for speed-variably controlling a discharge pressure of the fuel pump;
• a fuel pressure detection means positioned downstream the fuel filter for detecting a fuel pressure inside the fuel pipe;
• a pulse width correction means for correcting a width of a pulse to be applied to the injector, according to the fuel pressure detected by the fuel pressure detection means;
• and
• a fuel pressure control means for controlling the speed-variable driving means by feedback, based on the fuel pressure detected by the fuel pressure detection means so that the fuel pressure coincides with a target-pressure, the fuel pressure control means including a means for correcting a correction value to be used to control the speed-variable driving means by the feedback, according to a load applied to the internal combustion engine.