FUEL INJECTION METHOD IN FUEL INJECTOR

摘要

To obtain a fuel injection method in a fuel injector capable of realizing excellent combustible and exhaustive characteristics, and carrying out fuel injection with an arbitrary fuel injection pattern thus allowing a degree of freedom of a fuel injection pattern to further expand. In an fuel injector comprising an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase of an injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed. Namely, a pressure during a movement from a base common rail pressure of the accumulator to a static maximum pressure statically determined by an operation of the intensifier is positively used as a control factor of injection, whereby a fuel injection pattern can be implemented with an extremely high degree of freedom.