| 摘要 |
PURPOSE:To reduce production of noise and NOX by pilot injection and main injection proceded by the pilot injection through control of a fuel injection pressure related to the coefficient of fuel injection. CONSTITUTION:During the initial stage of introduction of an injection pressure in which driving of a second piston 18 is started, a moving force is exerted on a first piston 8 in a pressure chamber 9 to lift a needle valve 10, and a fuel injection nozzle 6 is opened to inject fuel oil therethrough. After fuel injection, the second piston 18 is driven by a given stroke, and when it is stopped by a spacer 15, an internal pressure in the pressure chamber 90 is increased again. Driving of the second piston 18 causes the occurrence of a timing lag to a previous transfer pressure. When a moving force against a spring 21, compressed at a given valve opening pressure, is compressed by the second piston to exert it on the first piston 8, the needle valve 10 is lifted again to inject the fuel. |
