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Title: Common rail fuel injection system

Abstract

A high-pressure pump is described for a fuel injection system having a fuel supply means for supplying fuel at a relatively constant pressure to the pump, the pump comprising: a pump body having a pumping chamber defined therein; a mechanically driven linearly reciprocating plunger disposed in the pumping chamber, the plunger having a head end and a tail end, the plunger being linearly reciprocatable over a stroke range between an extended position and a retracted position, the pumping chamber extending beyond the extended position of the plunger to define a head portion of the pumping chamber; plunger spring means for resiliently biasing the plunger to its retracted position; an inlet valve disposed in the pump body for admitting fuel to the pumping chamber within the stroke range of the head end of the plunger; inlet valve spring means for resiliently biasing the inlet valve to a closed position, the inlet valve being opened by a pressure differential when the head end of the plunger is retracted; an outlet valve disposed in the pump body for discharging fuel from the head portion of the pumping chamber; and outlet valve spring means for resiliently biasing the outlet valve to a closed position;more » the inlet valve being a ball valve; a piston, the pump body further defining therein a leakage accumulator chamber, the leakage accumulator chamber being slidably divided by the piston into an anterior portion and a posterior portion, the posterior portion being at substantially atmospheric pressure, the collector groove communicating with the anterior portion of the leakage accumulator chamber, recaptured fuel from the fuel injection nozzles also being communicated to the anterior portion of the accumulator chamber; and piston spring means for resiliently biasing the piston away from the posterior portion of the leakage accumulator chamber.« less

Inventors:
; ; ; ;
Publication Date:
OSTI Identifier:
6472839
Patent Number(s):
US 5230613; A
Application Number:
PPN: US 7-821964
Assignee:
Diesel Technology Co., Wyoming, MI (United States) IMS; EDB-93-113708
Resource Type:
Patent
Resource Relation:
Patent File Date: 16 Jan 1992
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; FUEL INJECTION SYSTEMS; PUMPS; AUTOMOTIVE FUELS; FLOW REGULATORS; FLUID FLOW; LEAKS; LIQUID FUELS; CONTROL EQUIPMENT; EQUIPMENT; FUEL SYSTEMS; FUELS; 330603* - Vehicle Design Factors- Engine System

Citation Formats

Hilsbos, R.L., Wieland, H.L., Straub, R.D., Teerman, R.F., and Timmer, R.C.. Common rail fuel injection system. United States: N. p., 1993. Web.
Hilsbos, R.L., Wieland, H.L., Straub, R.D., Teerman, R.F., & Timmer, R.C.. Common rail fuel injection system. United States.
Hilsbos, R.L., Wieland, H.L., Straub, R.D., Teerman, R.F., and Timmer, R.C.. 1993. "Common rail fuel injection system". United States. doi:.
@article{osti_6472839,
title = {Common rail fuel injection system},
author = {Hilsbos, R.L. and Wieland, H.L. and Straub, R.D. and Teerman, R.F. and Timmer, R.C.},
abstractNote = {A high-pressure pump is described for a fuel injection system having a fuel supply means for supplying fuel at a relatively constant pressure to the pump, the pump comprising: a pump body having a pumping chamber defined therein; a mechanically driven linearly reciprocating plunger disposed in the pumping chamber, the plunger having a head end and a tail end, the plunger being linearly reciprocatable over a stroke range between an extended position and a retracted position, the pumping chamber extending beyond the extended position of the plunger to define a head portion of the pumping chamber; plunger spring means for resiliently biasing the plunger to its retracted position; an inlet valve disposed in the pump body for admitting fuel to the pumping chamber within the stroke range of the head end of the plunger; inlet valve spring means for resiliently biasing the inlet valve to a closed position, the inlet valve being opened by a pressure differential when the head end of the plunger is retracted; an outlet valve disposed in the pump body for discharging fuel from the head portion of the pumping chamber; and outlet valve spring means for resiliently biasing the outlet valve to a closed position; the inlet valve being a ball valve; a piston, the pump body further defining therein a leakage accumulator chamber, the leakage accumulator chamber being slidably divided by the piston into an anterior portion and a posterior portion, the posterior portion being at substantially atmospheric pressure, the collector groove communicating with the anterior portion of the leakage accumulator chamber, recaptured fuel from the fuel injection nozzles also being communicated to the anterior portion of the accumulator chamber; and piston spring means for resiliently biasing the piston away from the posterior portion of the leakage accumulator chamber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 7
}
  • This patent describes a high-pressure pump for the injectors of an electronically controlled fuel system. It comprises: a pump body having a chamber therein, a reciprocal plunger in the chamber having a fixed stroke, a solenoid operated normally closed metering inlet valve for metering fuel into the chamber, a normally closed discharge valve, both of the valves being located within the pump body and closing respective fuel ports communicating with the chamber at one end of the plunger and means for controlling the amount of fuel discharged by the pump comprising an electronic control for the solenoid-operated valve to determinemore » the time that the valve is held open during the intake stroke of the plunger; and a supply pump for delivering fuel at a relatively fixed pressure to the metering inlet valve.« less
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  • Passenger car DI Diesel engines need a flexible fuel injection system. Bosch developed a common rail system for this purpose. Besides variation of fuel quantity and start of injection, it allows choosing injection pressure in the range of 150 to 1,400 bar and injecting fuel in several portions. These new means will contribute to further improvements of DI engines concerning noise, exhaust emissions and engine torque.