Multiple stage pump with multiple external control valves
a control valve and multi-stage technology, applied in the direction of machine/engine, fuel injecting pump, positive displacement liquid engine, etc., can solve the problem of variable pump system, pump displacement of hydraulic pump not adjusted to the needed amount of energy, and inability to be widely used in the automotive industry
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[0025] The present invention is directed to a multiple stage pump for hydraulic systems, and more particularly a rail and pump system adapted for providing working fluid to hydraulically controlled fuel injectors. The multiple stage pump of the present invention provides an adjustable system which increases fuel efficiency and reduces or eliminates pressure peaks throughout the stages of the multiple stage pump. The multiple stage pump of the present invention is also capable of reducing or eliminating injection variations in a fuel injector.
[0026] Referring now to FIG. 2, a first embodiment of the multiple stage pump is provided. In this embodiment, the multiple stage pump is generally depicted as reference numeral 20 and includes pumps 22a and 22b located on respective branches 24a and 24b of the multiple stage pump system 20 of the present invention. The pumps 22a, 22b are preferably arranged in parallel, and may be associated with respective valve and reservoir systems 26a, 26b....
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