초록 ▼

A high-pressure fuel supply system is suitable for an internal combustion engine having an in-cylinder injector for injecting a fuel into a cylinder. The high-pressure fuel supply system includes a high-pressure fuel pump driven by an engine, a high-pressure delivery pipe supplying the fuel from the

A high-pressure fuel supply system is suitable for an internal combustion engine having an in-cylinder injector for injecting a fuel into a cylinder. The high-pressure fuel supply system includes a high-pressure fuel pump driven by an engine, a high-pressure delivery pipe supplying the fuel from the high-pressure fuel pump to the in-cylinder injector, and an actuation valve provided with a leakage function provided between the high-pressure fuel pump and the high-pressure delivery pipe. 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.

대표청구항 ▼

What is claimed is: 1. A high-pressure fuel supply apparatus of an internal combustion engine having a fuel injection mechanism for injecting a fuel into a cylinder, comprising: a high-pressure fuel pump driven by the internal combustion engine; a high-pressure pipe supplying the fuel from said hig

What is claimed is: 1. A high-pressure fuel supply apparatus of an internal combustion engine having a fuel injection mechanism for injecting a fuel into a cylinder, comprising: a high-pressure fuel pump driven by the internal combustion engine; a high-pressure pipe supplying the fuel from said high-pressure fuel pump to said fuel injection mechanism; and an actuation valve provided with a leakage function provided between said high-pressure fuel pump and said high-pressure pipe; wherein an amount of leakage per a unit time in said actuation valve provided with a leakage function is set to an amount equal to or larger than a discharge amount per a unit time calculated by using a minimum discharge amount in said high-pressure fuel pump. 2. The high-pressure fuel supply apparatus of an internal combustion engine according to claim 1, wherein said actuation valve is a check valve. 3. A method of designing a high-pressure fuel supply apparatus of an internal combustion engine having a fuel injection mechanism for injecting a fuel into a cylinder, comprising the steps of: calculating a minimum discharge amount per a unit time in a high-pressure fuel pump driven by the internal combustion engine; and setting an amount of leakage per a unit time in an actuation valve provided with a leakage function provided between said high-pressure fuel pump and a high-pressure pipe supplying the fuel from said high-pressure fuel pump to said fuel injection mechanism to an amount equal to or larger than said minimum discharge amount per a unit time. 4. The method of designing a high-pressure fuel supply apparatus of an internal combustion engine according to claim 3, wherein said step of calculating said minimum discharge amount includes the step of calculating said minimum discharge amount per a unit time by using an engine speed of the internal combustion engine. 5. The method of designing a high-pressure fuel supply apparatus of an internal combustion engine according to claim 3, wherein said step of calculating said minimum discharge amount includes the step of calculating said minimum discharge amount per a unit time by using an idle speed of the internal combustion engine.