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    • 10. 发明授权
    • Fuel injector for an internal combustion engine
    • 用于内燃机的燃油喷射器
    • US4603671A
    • 1986-08-05
    • US639433
    • 1984-08-10
    • Toru YoshinagaToshihiko IgashiraYasuyuki SakakibaraYukihiro Natsuyama
    • Toru YoshinagaToshihiko IgashiraYasuyuki SakakibaraYukihiro Natsuyama
    • F02M47/02F02M47/04F02M59/10F02M39/00
    • F02M59/105F02M47/027F02M47/043
    • An electronically controllable, ultra-high pressure fuel injector comprises a differential pressure type injection nozzle which is opened and closed by an actuating element operated by a hydraulic power cylinder including a piston received in a working chamber. Working fuel to the working chamber of the power cylinder is ON/OFF controlled by an electronically controllable solenoid valve which when energized releases the pressure in the working chamber to open the injection nozzle. In order to ensure that the power cylinder is controlled by a compact, high response solenoid valve, the construction of the power cylinder and the injection nozzle is such that the force applied to the power cylinder piston by the working fuel pressure in the working chamber is substantially greater than the force applied to the actuating element by the fuel pressure in the pressure chamber in the injection nozzle or the fuel pressure in the passage for supplying the working fuel. Preferably, the fuel injector is provided with an injection rate control arrangement such as a flow control arrangement for limiting the flow rate of working fuel as it enters the working chamber and for increasing the flow rate of the working fuel as it is released therefrom, so that the rate of injection increases gradually at the outset of fuel injection but rapidly drops at the completion of the injection.
    • 电子可控的超高压燃料喷射器包括压差式喷射喷嘴,其通过由包括接收在工作室中的活塞的液压动力油缸操作的致动元件而打开和关闭。 通过电子可控电磁阀控制动力缸工作室的工作燃油,当通电时释放工作室中的压力以打开喷嘴。 为了确保动力缸由紧凑,高响应的电磁阀控制,动力缸和注射喷嘴的结构使得通过工作室中的工作燃料压力施加到动力缸活塞的力是 明显大于通过喷射喷嘴中的压力室中的燃料压力或用于供应工作燃料的通道中的燃料压力施加到致动元件的力。 优选地,燃料喷射器设置有喷射速率控制装置,例如用于限制工作燃料进入工作室的流量的流量控制装置,并且用于当工作燃料从其释放时增加工作燃料的流量,因此 注射速率在燃料喷射开始时逐渐增加,但在注射完成时迅速下降。