Abstract: To provide an accumulator fuel injection device, so as to stabilize the operation of a pressure control valve for controlling a fuel pressure in an accumulator. The accumulator fuel injection device includes a pressure control valve 6 for controlling the fuel pressure in the accumulator by moving an armature 13 in an armature chamber 22 and by adjusting escaped volumes of the fuels from the accumulator 2 due to a valving element 11 formed integral with the armature 13 in a control chamber 21 introducing the fuels in the accumulator 2. A means for attenuating the pressure transmitted from the accumulator 2 to the valve seat 10 is provided in the valve seat 10 disposed between the control chamber 21 and the accumulator 2 of the pressure control valve 6.

Abstract: To make it possible to pump a fuel from a supply pump into an accumulator, even when a pressure control means provided with a pressurized fuel pathway is out of action. In a fuel supply system of an engine, which is provided with pressure control means controlling a fuel pressure in an accumulator, on the pressurized fuel pathway delivering the fuel from a feed pump via a supply pump having a plurality of plungers into the accumulator, at least one pressurized fuel pathway is not provided with the pressure control means and the other pressurized fuel pathways are provided with the pressure control means, out of the plurality of pressurized fuel pathways delivering the fuel from the feed pump via plurality of plungers into the accumulator.

Abstract: To provide an accumulator fuel injection device, so as to stabilize the operation of a pressure control valve for controlling a fuel pressure in an accumulator. The accumulator fuel injection device includes a pressure control valve 6 for controlling the fuel pressure in the accumulator by moving an armature 13 in an armature chamber 22 and by adjusting escaped volumes of the fuels from the accumulator 2 due to a valving element 11 formed integral with the armature 13 in a control chamber 21 introducing the fuels in the accumulator 2. A means for attenuating the pressure transmitted from the accumulator 2 to the valve seat 10 is provided in the valve seat 10 disposed between the control chamber 21 and the accumulator 2 of the pressure control valve 6.

Abstract: To make it possible to pump a fuel from a supply pump into an accumulator, even when a pressure control means provided with a pressurized fuel pathway is out of action. In a fuel supply system of an engine, which is provided with pressure control means 20, 40 controlling a fuel pressure in an accumulator 2, on the pressurized fuel pathway delivering the fuel from a feed pump 16 via a supply pump 3 having plurality of plungers 5,5 into the accumulator 2, at least one pressurized fuel pathway is not provided with the pressure control means 20, 40 and the other pressurized fuel pathways are provided with the pressure control means 20, 40, out of plurality of pressurized fuel pathways delivering the fuel from the feed pump 16 via plurality of plungers 5,5 into the accumulator 2.

Abstract: A method for controlling a common-rail fuel injection system, which avoids the adverse effect of the pilot injection on the main injection while driving an engine and maximizes the cleaning up of the exhaust gas by the pilot injection or the like, is provided. In the common-rail fuel injection system performing a multistage injection, a pilot injection timing ?p at a crankshaft angle and a main injection timing ?m at the crankshaft angle base are controlled by a ECU. The ECU calculates a pilot injection interval Tpin at a time base and adjusts the main injection timing ?m when the pilot injection interval Tpin is less than the predefined threshold (1 (ms) in the present embodiment).