Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-12-16
2001-12-18
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
Reexamination Certificate
active
06330875
ABSTRACT:
TECHNICAL FIELD
The invention relates generally to engines having both hydraulic fuel injection and an antilock braking systems (ABS), and more specifically to hydraulic fuel injection and an ABS circuit driven by a single hydraulic pump.
BACKGROUND
Antilock braking systems (ABS) utilize hydraulic pumps to provide the pulsating braking power that reduces the chances of a vehicle's wheels locking up and skidding uncontrollably during braking. Hydraulically actuated fuel injectors also utilize hydraulic pumps to provide hydraulic fluid to fuel injectors at sufficient pressure for use in actuating the fuel injectors.
Conventionally, ABS circuits utilize a hydraulic pump other than the hydraulic pump used for hydraulic actuation of the fuel injectors.
SUMMARY OF THE INVENTION
In one aspect of the invention, an engine system comprises a hydraulically actuated fuel injection system and an ABS circuit connected via a fluid flow passage that provides hydraulic fluid to both the fuel injection system and to the ABS circuit. The hydraulically actuated system includes a high pressure pump. The fluid flow passage is in fluid communication with an outlet from the high pressure pump.
In another aspect of the invention, a combined hydraulic and ABS booster comprises a high pressure pump having at least one outlet, an ABS circuit having a flow passage with one end fluidly connected to the at least one outlet, and a hydraulic circuit having a plurality of hydraulically actuated devices with inlets fluidly connected to the at least one outlet.
In yet another aspect of the invention, a combined hydraulically actuated fuel injection and ABS booster comprises a high pressure pump having an inlet fluidly connected to a source of fluid and at least one outlet, an ABS circuit having a flow passage fluidly connected to the at least one outlet, a high pressure common rail fluidly connected to the at least one outlet, and a plurality of hydraulically actuated fuel injectors fluidly connected to the common rail.
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Bartley Bradley E.
Blass James R.
Gibson Dennis H.
Bram Eric M.
Caterpillar Inc.
McNeil Michael B.
Moulis Thomas N.
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