HIGH-PRESSURE FUEL SUPPLY APPARATUS OF INTERNAL COMBUSTION ENGINE AND METHOD OF DESIGNING THE SAME

摘要

A high-pressure fuel supply system is suitable for an internal combustion engine having an in-cylinder injector (110) for injecting a fuel into a cylinder. The high-pressure fuel supply system includes a high-pressure fuel pump (200, 300) driven by an engine, a high-pressure delivery pipe (112) supplying the fuel from the high-pressure fuel pump (200, 300) to the in-cylinder injector (110), and an actuation valve provided with a leakage function provided between the high-pressure fuel pump (200, 300) and the high-pressure delivery pipe (112). An amount of leakage in the actuation valve provided with the leakage function is set to an amount not smaller than a discharge amount of the high-pressure fuel pump (200, 300).