Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-06-07
2005-06-07
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S506000, C417S289000, C417S270000
Reexamination Certificate
active
06901911
ABSTRACT:
A hydraulic system, such as a fuel injection system, includes a fixed displacement pump with at least one pump piston. A sleeve surrounds each pump piston and provides the method by which fluid displaced by the pumping stroke of the pump piston is directed either to a high pressure area in the pump or a low pressure area. The sleeves are a portion of an electro-hydraulic controller that includes a mechanical bias to bias the pump to a high output position when a pressure differential between the outlet area and the inlet area is relatively low, such as at cold start up. This aspect facilitates priming of the system. In addition, the controller includes a biasing hydraulic surface in opposition to the mechanical biaser that serves to bias the pump to its low output position when the pressure differential between the outlet area and the inlet area is relatively high. This aspect prevents over pressurization in the event that electric current to the controller is disrupted.
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Anderson Michael D.
Friede Matthew D.
Gibson Dennis H.
Pickell Michael E.
Wear Jerry A.
Caterpillar Inc
Liell & McNeil
Miller Carl S.
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