公开(公告)号：WO2009127868A1

公开(公告)日：2009-10-22

申请号：PCT/GB2009/050369

申请日：2009-04-15

Applicant: DELPHI TECHNOLOGIES, INC. ,  SMITH, Samuel ,  GRAHAM, Mark ,  KNIGHT, Andrew ,  D'AUBYN, Robert

Inventor： SMITH, Samuel ,  GRAHAM, Mark ,  KNIGHT, Andrew ,  D'AUBYN, Robert

IPC: F02M21/02

CPC classification number: F02M21/0212 ,  F02M21/0251 ,  F02M21/0263 ,  Y02T10/32

Abstract: A fuel injector for an internal combustion engine operated by a liquefied gas fuel includes an isolation valve (60) that interrupts the fuel supply passage (2) supplying pressurised fuel, such as liquefied dimethyl ether, to the injector nozzle (22). A further isolation valve (60') may be included in a fuel outlet passage (50) of the injector. The isolation valves (60,60') are maintained in an open position by the fuel pressure in the injector when the pressure reaches a predetermined level, such as occurs when the engine is switched on, but close when the engine is switched off and the fuelpressure decays. The injector nozzle may therefore be isolated from the remainder of the fuel system when the engine is not running. To control injection timing, the injector may also include a statically leakless valve (102) in fluid communication with afluid outlet line (130) upstream of the further isolation valve (60') and isolated from the fuel supply passage, thereby reducing the risk of stem leakage.

Abstract translation: 用于由液化气燃料操作的内燃机的燃料喷射器包括隔离阀（60），该隔离阀（60）中断向喷射器喷嘴（22）供应诸如液化二甲醚的加压燃料的燃料供给通道（2）。 另外的隔离阀（60'）可以包括在喷射器的燃料出口通道（50）中。 当压力达到预定水平时，例如发动机接通时发生的隔离阀（60,60'）由喷射器内的燃料压力保持在打开位置，而当发动机关闭时闭合，并且 燃油压力衰减。 因此，当发动机不运行时，喷射器喷嘴可以与燃料系统的其余部分隔离。 为了控制喷射正时，喷射器还可以包括与另外的隔离阀（60'）上游的流出口管线（130）流体连通并与燃料供应通道隔离的静态泄漏阀（102），从而降低了 茎漏。