High-pressure fuel supply apparatus of internal combustion engine and method of designing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYasumichi Inoue, Zenichiro Mashiki
Life of this patent
Estimating the term…
Abstract
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.
Claims5
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.
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.
Dependencies are inferred from the claim text.