| 摘要 |
The invention relates to a fuel injector which requires preferably no more than about 10 pounds-force to open the fuel injector, regardless of the pressure downstream of the injector and interfacing with the injector when closed prior to injection. For instance, this low actuation force may be utilized for each and every discharge pressure within the range from a vacuum to about 1,000 psi. Principally, for a given inlet pressure (e.g., the pressure within the fuel injector when closed prior to injection) and a given discharge pressure (e.g., the pressure downstream of the discharge port when closed and interfacing with the fuel injector), at least two surface areas are jointly selected to allow for the use of this reduced actuation force. One of these surface areas is exposed to the inlet pressure and exerts a force which is generally directed to close the discharge port. The other of these surface areas is exposed to the discharge pressure and exerts a force which is generally directed to open the discharge port. Once the inlet pressure and discharge pressure are established for the design of the fuel injector, the noted surface areas may be jointly selected to provide for the use of less than about 10 pounds-force to open the fuel injector, preferably in no more than about 1 millisecond. |
