GB2577900A - High pressure fuel pump system - Google Patents

High pressure fuel pump system Download PDF

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Publication number
GB2577900A
GB2577900A GB1816474.9A GB201816474A GB2577900A GB 2577900 A GB2577900 A GB 2577900A GB 201816474 A GB201816474 A GB 201816474A GB 2577900 A GB2577900 A GB 2577900A
Authority
GB
United Kingdom
Prior art keywords
inlet
outlet
chamber
check valve
high pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1816474.9A
Other versions
GB201816474D0 (en
Inventor
Leblay Arnaud
Aye Andreas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BorgWarner Luxembourg Automotive Systems SA
Original Assignee
Delphi Automotive Systems Luxembourg SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Priority to GB1816474.9A priority Critical patent/GB2577900A/en
Publication of GB201816474D0 publication Critical patent/GB201816474D0/en
Publication of GB2577900A publication Critical patent/GB2577900A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A high pressure fuel pump system including an inlet and outlet, comprising a cam 4 driven plunger 2 pump adapted to pressurize fuel in a pump pressurisation chamber 3, said pressurisation chamber 3 having a chamber inlet and a chamber outlet, including a first mechanical check valve 30 located upstream of said chamber inlet and a solenoid controlled proportional flow control valve 31 located between said check valve 30 and system inlet. This arrangement aims at overcoming acoustic noise associated with the use of a spill valve to regulate system outlet flow and accumulator pressure.

Description

HIGH PRESSURE FUEL PUMP SYSTEM
TECHNICAL FIELD
This invention relates to high pressure pumps systems for use in fuel injection engines.
BACKGROUND OF THE INVENTION
Typically high pressure fuel is supplied to an accumulator volume such, as a common rail and, subsequently to one or more fuel injectors, by a high pressure pump system including a high pressure pump. So high pressure fuel is provided from a high pressure pump, typically via a cam driven piston (plunger). Various inlet and outlet valves are provided in a high pressure pumping system to control and regulate fuel flow.
It is known to use a spill valve to regulate the outlet flow and the rail pressure.
However, such spill valves are generally "ON/OFF" valves, generating acoustic noise.
It is an object of the invention to provide a high pressure fuel pump system overcoming such problems.
SUMMARY OF THE INVENTION
In one aspect is provided a high pressure fuel pump system including an inlet and outlet, comprising a cam driven plunger pump, adapted to pressurize fuel in a pump pressurization chamber, said pressurization chamber having a chamber inlet and a chamber outlet, and including a first mechanical check valve located upstream of said chamber inlet and a solenoid controlled proportional flow control valve located between said check valve and system inlet The system may including a further (parallel) flow path located between said system inlet and outlet including a pressure relief valve located in said flow path.
The system may include a further (parallel) flow path located between said system inlet and outlet including a mechanical check valve The system may include a mechanical check valve located between said system outlet and the outlet of the pressurisation chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which: -Figure la shows a schematic diagram of known high pressure pump circuitry; - Figure lb shows illustrates the flow for the arrangement of figure la.
Figure 2a shows an example of the invention - Figure 2b shows illustrates the flow for the arrangement of figure 2a.
Figures 3a and b show in one aspect a design showing the combined check valve and solenoid controlled proportional control valve in closed and open position respectively.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Prior Art
Figure la shows a schematic diagram of known high pressure pump circuitry used to supply high pressure fuel to an accumulator volume such as a common rail. The circuitry typically comprises a piston driven pump designated generally with reference numeral 1 which comprises a plunger (piston) 2 driven by a cam 4 and adapted to pressurize fuel in a pressurization chamber 3. Low pressure fuel is supplied to an inlet to the pressurization chamber via a check valve (controlled to the closure) which can be referred to as a spill valve 5. This is a solenoid controlled valve. Typically, there may be an (e.g. pneumatic) pressure accumulator 6 to smooth the pressure in the supply side thus dampening any fluctuation in pressure. There is an outlet from the pressurization chamber where high pressure fuel is supplied to a common rail, typically via a spring biased check valve 7. In parallel with the spring controlled check valve is a pressure relief (safety) valve 8. Reference numerals 20, 21 and 22 refer to flow paths which are high pressure, variable pressure and low pressure respectively.
Figure lb shows illustrates the flow for the arrangement of figure la Arrows prefixed with 9 shows flow for normal conditions, arrows 10, 11, 12, 13 show the flow for hot soak conditions, DECO "foot off "conditions, "limp home" mode and leaking INIV respectively. Subscript "h" means the flow is at general high pressure and "I" low pressure Invention According to one aspect the spill valve (solenoid) controlled check valve, is replaced by a purely spring biased (mechanical) check valve (normally closed) and a proportional flow control valve which is solenoid controlled.
Preferably there is additionally a bypass line providing a by-pass function for limp home mode.
An example of the invention is shown in figure 2a. Like components have the same reference numerals are as in figure 1. Here the check/spill valve 5 is replaced with a spring controlled (mechanical) check valve 30 which is biased to the closed position and a proportional flow control valve 31, the latter being located between the spring controlled check valve 30 and the low pressure fuel supply i.e. upstream of the spring controlled check valve 30 which is biased in the closed.
The circuitry again shows the pump and a spring biased check valve 7 between the high pressure outlet of the pump and the high pressure outlet. Again in parallel, between the low pressure side and the high pressure side is a second by-pass line (flow path) 34, which includes a pressure relief valve 35, thus located between the low pressure supply and the high pressure outlet (HIP supply to the common rail) In addition, in parallel is provided preferably also a further by-pass line (flow path) 32 between the low pressure side and the high pressure side which includes a spring biased check valve 33 thus located between the low pressure supply and the high pressure outlet (HP supply to the common rail). Valve 33 is normally closed (biased by a spring) and allows fuel to flow from the nominal low pressure side to the high pressure side Reference numerals 20, 21 and 22 refer to flow paths which are high pressure, variable pressure and low pressure respectively.
Figure 2b shows illustrates the flow for the arrangement of figure 2a. Again arrows prefixed with 9 shows flow for normal conditions, arrows 10, 11, 12, 13 show the flow for hot soak conditions, DFC0 "foot off -conditions, "limp home- ] 5 mode and leaking IMV respectively. Subscript "h" means the flow is at general high pressure and "I" low pressure.
The solenoid controlled proportional flow control valve located between said check valve and system inlet is normally closed.
According to one aspect a design showing the combined check valve 30 and solenoid controlled proportional control valve 3lis shown on Fig. 3a and b.
On the left hand side of the figure is shown the mechanical spring biased check valve designated generally with reference numeral 40. The portion designated with reference numeral 41shows the solenoid control proportional control valve.
The valve 41 is a solenoid controlled valve and includes an armature housing 42 with a bore to accommodate a (high precision) pin 44, which is adapted to reciprocate along the direction of the double headed arrow. An armature 47 which is fixedly connected to the pin is urged to the left (biased) by spring means 49. Pole piece 48 is shown. A magnetic coil 46 is shown in the location, With no current, the pin is urged to the left to a closed position so flow from the inlet 43 cannot pass to the check valve and further to the pump inlet, as shown in figure 3a by the thick arrow.
Depending on the current through it, the coil urges the armature (and pin) to the right. The pin is adapted to thus move along a bore generally located centrally within the housing. This allows flow from inlet 43 to flow to the valve.
and when check valve 40 is open to flow also to the pump inlet. So figure 3a shows flow (thick arrow) when the proportional control flow valve of figure 3a is closed and no energy is supplied to the solenoid (first positon) As can be seen this results in not flow to the inlet to the pump. Figure 3b shows the flow (thick arrow) when the valve is in the open position as a result of the valve being energised.

Claims (4)

  1. CLAIMSL A high pressure fuel pump system including an inlet and outlet, comprising a cam driven plunger pump, adapted to pressurize fuel in a pump pressurization chamber, said pressurization chamber having a chamber inlet and a chamber outlet, and including a first mechanical check valve located upstream of said chamber inlet and a solenoid controlled proportional flow control valve located between said check valve and system inlet.
  2. 2. A system as claimed in claim 1 including a further (parallel) flow path located between said system inlet and outlet including a pressure relief valve located in said flow path.
  3. 3 A system as claimed in claim 1 or 2 including a further (parallel) flow path located between said system inlet and outlet including a mechanical check valve.
  4. 4. A system as claimed in claim 1 to 3 including a mechanical check valve located between said system outlet and the outlet of the pressurisation chamber.
GB1816474.9A 2018-10-09 2018-10-09 High pressure fuel pump system Withdrawn GB2577900A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1816474.9A GB2577900A (en) 2018-10-09 2018-10-09 High pressure fuel pump system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1816474.9A GB2577900A (en) 2018-10-09 2018-10-09 High pressure fuel pump system

Publications (2)

Publication Number Publication Date
GB201816474D0 GB201816474D0 (en) 2018-11-28
GB2577900A true GB2577900A (en) 2020-04-15

Family

ID=64395016

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1816474.9A Withdrawn GB2577900A (en) 2018-10-09 2018-10-09 High pressure fuel pump system

Country Status (1)

Country Link
GB (1) GB2577900A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140255219A1 (en) * 2013-03-05 2014-09-11 Stanadyne Corporation Valve Configuration For Single Piston Fuel Pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140255219A1 (en) * 2013-03-05 2014-09-11 Stanadyne Corporation Valve Configuration For Single Piston Fuel Pump

Also Published As

Publication number Publication date
GB201816474D0 (en) 2018-11-28

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)