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US 6,148,805 AGranted
Engine with hydraulic fuel injection and EGR valve using a single high pressure pump
AssigneeCaterpillar Inc.
InventorsBradley E. Bartley, James R. Blass, Dennis H. Gibson
Life of this patent
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Abstract
An engine system comprises a hydraulically actuated fuel injection system and an EGR valve circuit connected via a fluid flow passage that provides hydraulic fluid to both the fuel injection system and to the EGR valve circuit. The hydraulically actuated system includes a high pressure pump. The fluid control passage is in fluid communication with an outlet from the high pressure pump.
Claims13
A combined hydraulic and EGR valve system comprising:
- a high pressure pump having at least one outlet;
- an EGR valve 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,
- wherein the EGR valve passage further includes a flow passage fluidly connected to a fluid reservoir;
- the hydraulic devices having outlets fluidly connected to the fluid reservoir;
- and
- the high pressure pump having an inlet fluidly connected to the fluid reservoir.
5 more elements
A combined hydraulically actuated fuel injection and EGR valve comprising:
- a high pressure pump having an inlet fluidly connected to a source of fluid and at least one outlet;
- an EGR valve 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.
2 more elements
A method for operating a motor vehicle, comprising:
- using a high pressure pump to feed high-pressure hydraulic fluid to both an EGR valve circuit and a high pressure common rail;
- supplying high-pressure hydraulic fluid from the common rail to a plurality of hydraulically actuated fuel injectors;
- and
- using the high-pressure hydraulic fluid from the common rail to actuate the plurality of hydraulically actuated fuel injectors.
1 more element
Dependencies are inferred from the claim text.