| 摘要 |
A fuel injection device is provided with a fuel injection valve for injecting fuel into a combustion chamber and an air injection valve for the injection of air into the combustion chamber. One fuel injection orifice which opens into the combustion chamber is provided correspondingly to the fuel injection valve and plural air injection orifices which open into the combustion chamber are provided correspondingly to the air injection valve. A design is made so that fuel and air injected from the fuel injection orifice and the air injection orifices come into collision with each other at a collision point. The shape, size and direction of the fuel injection orifice are specified. Likewise, the number, shape, size and direction of the air injection orifice, as well as its arrangement relative to the fuel injection orifice, are specified. A design is made so that the size of a fuel spray and that of air jets at the collision point become equal to each other. A fuel injection control device is provided with various sensors for detecting an operating condition of an engine and an electronic control unit (ECU) for controlling the fuel injection valve and the air injection valve each independently. For controlling a spray penetration distance, a spray particle diameter and a spray shape of the fuel injected from the fuel injection orifice, the ECU, on the basis of the detected operating condition of the engine, controls the fuel injection valve and also controls at least one of timing and period of air injection performed by the air injection valve.
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