Fuel injection system for internal combustion engine

A fuel injection system for an internal combustion engine comprising a fuel injector for injecting fuel, said fuel injector having a fuel passage adding a swirl force to the fuel, said fuel injector being opened by driving a valve body toward a direction apart from a valve seat;

• and a controller for controlling driving of said valve body, wherein
• said controller controls driving of said valve body so that a time required until said valve body is moved from a closed state by a preset stroke to be opened may be longer when the internal combustion engine is operated in a high load and high rotation speed state than when the internal combustion engine is operated in a low load and low rotation speed state.

A fuel injection system for an internal combustion engine injecting fuel inside an air intake passage for conveying air into a cylinder of said internal combustion engine, said fuel injection system injecting the fuel by varying a penetration force of the fuel corresponding to an operating state of said internal combustion engine, which comprises:

• a movable member arranged inside said intake air passage in an upstream side of a position where fuel spray is injected and in a downstream side of a position where a throttle valve is located, said movable member being driven so that an area of said movable member projected on the cross section of said intake air passage may be varied;
• and
• a controller controlling said area of said movable member projected on the cross section of said intake air passage so as to be smaller when the internal combustion engine is operated in a high load and high rotation speed state than when the internal combustion engine is operated in a low load and low rotation speed state.

A fuel injection system for an internal combustion engine injecting fuel inside an air intake passage for conveying air into a cylinder of said internal combustion engine, said fuel injection system injecting the fuel by varying a penetration force of the fuel corresponding to an operating state of said internal combustion engine, which comprises:

• an opening-and-closing device arranged inside said intake air passage in an upstream side of a position where fuel spray is injected and in a downstream side of a position where a throttle valve is located, said opening-and-closing device opening and closing part of a cross-sectional area of said intake air passage;
• and
• a controller controlling said opening-and-closing device so that said cross-sectional area of said intake air passage is made to be larger when the internal combustion engine is operated in a high load and high rotation speed state than when the internal combustion engine is operated in a low load and low rotation speed state.

A fuel injection system for an internal combustion engine injecting fuel inside an air intake passage for conveying air into a cylinder of said internal combustion engine, said fuel injection system injecting the fuel by varying a penetration force of the fuel corresponding to an operating state of said internal combustion engine, wherein

• one selected from a particle size of the fuel and said penetration force of the fuel is varied by a movable member, located inside said air intake passage in an upstream side of a position where fuel spray is injected and in a downstream side of a position where a throttle valve is located, in accordance with at a low speed and at a high speed of the internal combustion engine.