| 摘要 |
<p>A fuel injector (10) requires preferably no more than about 10 pounds-force to open, regardless of the pressure downstream and interfacing with the injector when closed prior to injection. 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 and a given discharge pressure, at least two surfaces (66, 70) and their corresponding areas are jointly selected to allow the reduced actuation force to open the injector, preferably in no more than about 1 millisecond. One surface area is exposed to the inlet pressure and exerts a force which is generally directed to close the discharge port. The other surface area is exposed to the discharge pressure and exerts a force which is generally directed to open the discharge port.</p> |
