Fuel supply system of internal combustion engine

A fuel supply system of an internal combustion engine, said fuel supply system comprising:

• a delivery pipe for feeding pressurized fuel to fuel injectors for respectively injecting the fuel into each cylinder of said engine;
• a high-pressure fuel pump driven by movements of a pump actuating cam which is caused to rotate by energy imparted by said engine for delivering the pressurized fuel into said delivery pipe;
• a solenoid valve for regulating the quantity of fuel delivered by said high-pressure fuel pump;
• a fuel pressure sensor for detecting fuel pressure within said delivery pipe;
• a rotation signal generator for generating a rotation signal in accordance with rotation of said engine;
• a solenoid valve controller for generating a solenoid valve drive signal for controlling opening/closing behavior of said solenoid valve using said rotation signal as a reference so that said high-pressure fuel pump delivers a quantity of fuel appropriate for current operating conditions of said engine;
• and
• a mounting error estimator for transferring said engine from a state in which said high-pressure fuel pump does not deliver any pressurized fuel to a state in which said high-pressure fuel pump begins to deliver the pressurized fuel by gradually varying a solenoid valve drive signal output period while monitoring changes in the fuel pressure detected by said fuel pressure sensor, and for estimating a mounting error between angular mounting positions of said high-pressure fuel pump and said pump actuating cam with reference to said rotation signal from a state of said solenoid valve drive signal when a change in the fuel pressure has been detected;
• wherein said solenoid valve controller makes a correction to said solenoid valve drive signal in accordance with the value of the mounting error estimated by said mounting error estimator.