Accumulator fuel injection system capable of preventing abnormally high pressure

An accumulator fuel injection system comprising:

• a fuel supply pump driven by an internal combustion engine and supplying a fuel under pressure;
• a common rail for accumulating a high-pressure fuel supplied under pressure by the fuel supply pump;
• at least a fuel injection valve for injecting a fuel into a corresponding cylinder of the internal combustion engine;
• a pressure safety valve for keeping a fuel pressure in the common rail below a predetermined high limit pressure by opening the pressure safety valve when the fuel pressure in the common rail exceeds the predetermined high limit pressure;
• a fuel pressure detecting means for detecting the fuel pressure in the common rail;
• an abnormally high-pressure detecting means for detecting that a detected value of the fuel pressure in the common rail detected by the fuel pressure detecting means exceeds a lower limit of an abnormally high-pressure region set lower than the high limit pressure and is in the abnormally high-pressure region;
• and
• a fuel pressure increasing means for controlling the flow rate of fuel to be injected through the fuel injection valve so that the fuel pressure in the common rail reaches the high limit pressure when the internal combustion engine is started in a state in which the detected value of the fuel pressure in the common rail is in an abnormally high-pressure region by the abnormally high-pressure detecting means.