| 摘要 |
PURPOSE: A fuel injection control method for a direct-injection internal-combustion engine is provided to repress the penetration of a fuel jet in a combustion chamber for any positions of a piston between a lower limit position of the piston and a furthest position from a cylinder head by adjusting fuel injection parameters and to achieve several selections for injection time by forming a nappe of the fuel jet that does not wet a wall of a cylinder. CONSTITUTION: A fuel injection control method for a direct-injection internal-combustion engine is composed of at least an injector(20) of fuel jet nappe angle(a1), a cylinder(10), a cylinder head(12), a piston(18) slid in the cylinder and connected to a crankshaft, and a combustion chamber made up by a wall of the cylinder, the cylinder head and an upper face(24) of the piston. In addition, the fuel injection control method comprises steps of determining a lower limit position(PL) of the piston which the wall of the cylinder is wetted by the fuel jets from the injector below the lower limit position of the piston; deciding an effective position of the piston; deciding the effective position of the piston in relation to the lower limit position; and adjusting fuel injection parameters according to the effective position of the piston in relation to the lower limit position.
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