| 摘要 |
<p>A method of controlling hydraulically actuated, electrically controlled unit fuel injectors (11) to operate in response to the pressure of the working fluid or changes in the pressure of the working fluid is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the fuel injector (11) to inject the proper amount of fuel in the cylinders of an internal combustion engine and varying or adjusting the timing, duration and amplitude of a current pulse which activates the fuel injector (11) in response to the pressure of the working fluid or changes thereto. The fuel injector (11) is activated by energizing a stator (13) that draws an armature (15) to the stator (13) and opens a first seat (21) of the flow regulating device such as a poppet valve (19) against a spring bias to allow the high pressure working fluid into the injector (11) and closes a second seat (23) to prevent the working from draining from the injector (11) to allow the working fluid to operate the injector (11). Upon deactivation of the stator (13) the spring bias moves the armature (15) away from the stator (13), closes the first seat (21) and opens the second seat (23) of the poppet valve (19) in a manner that improves the overall performance of the fuel injector (11).</p> |
