WO2015028235A1 - A pulse count injector module - Google Patents

A pulse count injector module Download PDF

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Publication number
WO2015028235A1
WO2015028235A1 PCT/EP2014/066364 EP2014066364W WO2015028235A1 WO 2015028235 A1 WO2015028235 A1 WO 2015028235A1 EP 2014066364 W EP2014066364 W EP 2014066364W WO 2015028235 A1 WO2015028235 A1 WO 2015028235A1
Authority
WO
WIPO (PCT)
Prior art keywords
pci
fuel
module
housing
cover
Prior art date
Application number
PCT/EP2014/066364
Other languages
French (fr)
Inventor
Ramachandra PRADEEP
Joerg Lange
Original Assignee
Robert Bosch Gmbh
Robert Bosch Engineering And Business Solutions Limited
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 Robert Bosch Gmbh, Robert Bosch Engineering And Business Solutions Limited filed Critical Robert Bosch Gmbh
Publication of WO2015028235A1 publication Critical patent/WO2015028235A1/en

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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric

Definitions

  • the present invention relates to a pulse count injection system. Particularly the invention relates to a housing for a pulse count injector.
  • PCI pulse count injectors
  • the PCI needs a fuel supply around it which is made possible by providing a housing enclosing the PCI.
  • the PCI housing is integrated into the throttle body assembly with an intricate housing which limits the application and cannot be used as a discrete component.
  • WO2010112856 discloses one such pulse count fuel injector. Brief description of the drawing:
  • Fig. 1 illustrates a pulse count injector module in accordance with one embodiment of the invention.
  • Fig. 1 of the accompanying drawing illustrates a pulse count injector module in accordance with one embodiment of the invention.
  • a pulse count injector (PCI) module (100) in accordance with one embodiment of the invention comprises a PCI holder (101) and a PCI cover (102) which form a PCI housing to enclose a PCI (103).
  • a fuel inlet adapter (104) is connected to the PCI cover
  • the fuel inlet adapter (104) may be fitted on the PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together.
  • a fuel chamber (105) is formed between the PCI (103) and said PCI housing.
  • a vapour separator (106) is positioned between the PCI holder (101) and the PCI (103).
  • the vapour separator (106) is typically a metallic ring shaped element.
  • the vapour separator (106) is adapted to separate the hot vapours of fuel from the cold fuel flowing in the fuel chamber (105). The fuel vapours get collected in the top part of the fuel chamber (105).
  • a fuel inlet path (107) is provided for supplying fuel from the fuel chamber (105) to the PCI (103).
  • the fuel inlet path (107) is positioned in between the PCI housing and the vapour separator (106).
  • an electrical connector (109) for the PCI (103) is provided on the PCI cover (102).
  • the PCI (103) operation is controlled via pulsed signals given to the electrical connector (109) which controls a coil in the PCI (103) which causes the fuel to be pumped and injected by the PCI (103).
  • a sealing element (not shown) is provided at the outlet between said PCI (103) and PCI housing.
  • the sealing element is in form of an O-ring.
  • the O-ring is provided where the PCI positioned in the housing such that the fuel leakage from the fuel chamber (105) is prevented.
  • a mounting means (110) is provided on the fuel outlet (108) to mount the PCI module on the throttle body.
  • the mounting means may be an O-ring so that the PCI module (100) in accordance with this invention can be securely mounted.
  • the PCI module (100) is mounted at any other location in the air intake path.
  • a spring element (111) is positioned within the housing between the PCI (103) and the PCI cover (102) to hold the PCI (103) in place.
  • the PCI holder (101) is fitted on said PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together, compressing the spring element (111) resulting in a spring force to hold the PCI (103) in position.
  • the proposed pulse count injector (PCI) module (100) has a modular design.
  • the PCI (103) is placed inside the housing such that an un-interrupted fuel supply can be maintained in and around the PCI (103). This enables fast refilling of fuel through the inlet port of the injector during every injection cycle.
  • the PCI module (100) in accordance with one embodiment of the invention can replace the existing gasoline fuel injector without major changes to the intake manifold or the existing throttle body assembly.
  • the PCI module (100) can be mounted on the same position as that of the presently used gasoline injectors. Due to the PCI module (100) in accordance with this invention, the dependency on the other system components for the use of PCI (103) in the system can be reduced.
  • the PCI module (100) may be adapted to receive fuel by a gravity feed fuel inlet and provide pressurized fuel that can be atomized in intake path. With minor modifications to the outlet, the PCI module (100) housing concept can be used as simple fuel pump.
  • vapour separator (106) it is possible to maintain separation between the hot fuel vapours and the cold incoming fuel by the vapour separator (106) and avoid the hot fuel issues.
  • PCI Pulse count injector
  • the PCI requires to be surrounded by fuel during operation.
  • the PCI (103) includes a plunger which acts as a pump.
  • the PCI (103) is enclosed within a housing such that the housing is in a position which is operatively below the fuel tank so that the fuel flow to the PCI housing is via gravity.
  • the fuel surrounds the PCI (103) and may get heated due to the heat generated by operation of the PCI (103).
  • the heat generated causes the fuel in contact with the PCI (103) to vaporize.
  • a metallic vapour separator (106) prevents the mixing of heated fuel and the incoming cold fuel.
  • the surrounding fuel enters the PCI (103) and is pumped and injected into the intake path.

Abstract

A pulse count injector (PCI) module is disclosed. The PCI module comprises a PCI holder and a PCI cover which form a PCI housing to enclose a PCI. The PCI module further includes a fuel inlet adapter; a fuel chamber is formed between the PCI and said PCI housing, a vapour separator and a fuel outlet. The PCI module in accordance with one embodiment of the invention can replace the existing gasoline fuel injector without major changes to the intake manifold or the existing throttle body assembly.

Description

COMPLETE SPECIFICATION
TITLE
A PULSE COUNT INJECTOR MODULE
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed:
Field of the invention:
The present invention relates to a pulse count injection system. Particularly the invention relates to a housing for a pulse count injector.
Background of the invention:
The pulse count injectors (PCI) are typically used for small capacity engines. The PCI needs a fuel supply around it which is made possible by providing a housing enclosing the PCI. At present the PCI housing is integrated into the throttle body assembly with an intricate housing which limits the application and cannot be used as a discrete component.
WO2010112856 discloses one such pulse count fuel injector. Brief description of the drawing:
The present invention is described with reference to the following accompanying drawing, Fig. 1 illustrates a pulse count injector module in accordance with one embodiment of the invention.
Detailed description of the embodiments:
Fig. 1 of the accompanying drawing illustrates a pulse count injector module in accordance with one embodiment of the invention.
A pulse count injector (PCI) module (100) in accordance with one embodiment of the invention comprises a PCI holder (101) and a PCI cover (102) which form a PCI housing to enclose a PCI (103). A fuel inlet adapter (104) is connected to the PCI cover
(102) . The fuel inlet adapter (104) may be fitted on the PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together. A fuel chamber (105) is formed between the PCI (103) and said PCI housing. The PCI
(103) gets heated during its operation and causes the fuel in the fuel chamber (105) to heat and vapourize. A vapour separator (106) is positioned between the PCI holder (101) and the PCI (103). The vapour separator (106) is typically a metallic ring shaped element. The vapour separator (106) is adapted to separate the hot vapours of fuel from the cold fuel flowing in the fuel chamber (105). The fuel vapours get collected in the top part of the fuel chamber (105). A fuel inlet path (107) is provided for supplying fuel from the fuel chamber (105) to the PCI (103). The fuel inlet path (107) is positioned in between the PCI housing and the vapour separator (106). A fuel outlet (108) formed on said PCI holder (101) from where fuel is injected into the intake path by the PCI (103).
In accordance with one embodiment of the invention an electrical connector (109) for the PCI (103) is provided on the PCI cover (102). The PCI (103) operation is controlled via pulsed signals given to the electrical connector (109) which controls a coil in the PCI (103) which causes the fuel to be pumped and injected by the PCI (103).
In one embodiment of the invention it is envisaged that a sealing element (not shown) is provided at the outlet between said PCI (103) and PCI housing. Typically the sealing element is in form of an O-ring. The O-ring is provided where the PCI positioned in the housing such that the fuel leakage from the fuel chamber (105) is prevented.
In another embodiment of the invention a mounting means (110) is provided on the fuel outlet (108) to mount the PCI module on the throttle body. The mounting means may be an O-ring so that the PCI module (100) in accordance with this invention can be securely mounted. In another embodiment of the invention the PCI module (100) is mounted at any other location in the air intake path.
In one embodiment of the invention a spring element (111) is positioned within the housing between the PCI (103) and the PCI cover (102) to hold the PCI (103) in place. The PCI holder (101) is fitted on said PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together, compressing the spring element (111) resulting in a spring force to hold the PCI (103) in position.
For pulse count injectors it is necessary that the injector is surrounded by fuel to maintain a continuous supply of fuel. The proposed pulse count injector (PCI) module (100) has a modular design. The PCI (103) is placed inside the housing such that an un-interrupted fuel supply can be maintained in and around the PCI (103). This enables fast refilling of fuel through the inlet port of the injector during every injection cycle.
It is further envisaged that the PCI module (100) in accordance with one embodiment of the invention can replace the existing gasoline fuel injector without major changes to the intake manifold or the existing throttle body assembly. The PCI module (100) can be mounted on the same position as that of the presently used gasoline injectors. Due to the PCI module (100) in accordance with this invention, the dependency on the other system components for the use of PCI (103) in the system can be reduced. The PCI module (100) may be adapted to receive fuel by a gravity feed fuel inlet and provide pressurized fuel that can be atomized in intake path. With minor modifications to the outlet, the PCI module (100) housing concept can be used as simple fuel pump.
In accordance with one embodiment of the invention it is possible to maintain separation between the hot fuel vapours and the cold incoming fuel by the vapour separator (106) and avoid the hot fuel issues.
Many of the new two wheelers available in the market have fuel injection systems in place of carburettors. The fuel injection systems help to achieve efficient fuel combustion in the engines as the fuel can be injected in the intake path at high pressure in atomized form. Pulse count injector (PCI) is one such injection system which is used in low capacity engines like two wheelers. The PCI requires to be surrounded by fuel during operation. The PCI (103) includes a plunger which acts as a pump. In accordance with the present invention the PCI (103) is enclosed within a housing such that the housing is in a position which is operatively below the fuel tank so that the fuel flow to the PCI housing is via gravity. The fuel surrounds the PCI (103) and may get heated due to the heat generated by operation of the PCI (103). The heat generated causes the fuel in contact with the PCI (103) to vaporize. A metallic vapour separator (106) prevents the mixing of heated fuel and the incoming cold fuel. The surrounding fuel enters the PCI (103) and is pumped and injected into the intake path.

Claims

We claim,
1. A pulse count injector (PCI) module (100), said module comprising a PCI holder (101) and a PCI cover (102) forming a PCI housing to enclose a PCI (103); a fuel inlet adapter (104) connected to the PCI cover (102); a fuel chamber (105) formed between the PCI (103) and said PCI housing; a vapour separator (106) positioned between said PCI holder (101) and the PCI (103) and adapted to separate the hot vapours of fuel from the cold fuel flowing in said fuel chamber (105); a fuel inlet path (107) for supplying fuel from the fuel chamber (105) to PCI (103), said fuel inlet path (107) formed between said PCI housing and said vapour separator (106); and a fuel outlet (108) formed on said PCI holder (101) from where fuel is injected into the intake path by the PCI (103).
2. A PCI module as claimed in claim (1) wherein said vapour separator (106) is in form of a metallic ring.
3. A PCI module as claimed in claim (1) wherein said inlet adapter (104) fitted on said PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together.
4. A PCI module as claimed in claim (1) wherein an electrical connector (109) for the PCI (103) is provided on the PCI cover (102).
5. A PCI module as claimed in claim (1) wherein a sealing element is provided at the outlet (108) between said PCI (103) and PCI housing.
6. A PCI module as claimed in claim (1) wherein a mounting means (110) is provided on the fuel outlet (108) to mount the housing for PCI on a throttle body.
7. A PCI module as claimed in claim (1) wherein a spring element (111) is positioned between the PCI (103) and the PCI cover (102) to hold the PCI (103) in position.
8. A PCI module as claimed in claim (1) wherein said PCI holder (101) is fitted on said PCI cover (102) by means of threads or press fit or by using screws/bolts or by crimping the two parts together.
PCT/EP2014/066364 2013-08-30 2014-07-30 A pulse count injector module WO2015028235A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3875CH2013 2013-08-30
IN3875/CHE/2013 2013-08-30

Publications (1)

Publication Number Publication Date
WO2015028235A1 true WO2015028235A1 (en) 2015-03-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/066364 WO2015028235A1 (en) 2013-08-30 2014-07-30 A pulse count injector module

Country Status (1)

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WO (1) WO2015028235A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528807A1 (en) * 1995-08-05 1997-02-06 Dahlmann Gerd Uwe Fuel injector with integrated pump for IC engine - has integral pump to draw in fresh fuel during power stroke of injector
US6295972B1 (en) * 2000-03-30 2001-10-02 Bombardier Motor Corporation Of America Fuel delivery using multiple fluid delivery assemblies per combustion chamber
DE102008007349A1 (en) * 2008-02-04 2009-08-06 Robert Bosch Gmbh Compact injection device with reduced steam bubble inclination
DE102008001331A1 (en) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Compact injection device with flat anchor air actuator
WO2010112856A1 (en) * 2009-03-31 2010-10-07 Scion-Sprays Limited A fluid injector having a novel inlet valve arrangement
DE102009046091A1 (en) * 2009-10-28 2011-08-18 Robert Bosch GmbH, 70469 Injection device for internal combustion engine, particularly small motors, has fuel pump and injector, where fuel pump and injector are integral part of injection module

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528807A1 (en) * 1995-08-05 1997-02-06 Dahlmann Gerd Uwe Fuel injector with integrated pump for IC engine - has integral pump to draw in fresh fuel during power stroke of injector
US6295972B1 (en) * 2000-03-30 2001-10-02 Bombardier Motor Corporation Of America Fuel delivery using multiple fluid delivery assemblies per combustion chamber
DE102008007349A1 (en) * 2008-02-04 2009-08-06 Robert Bosch Gmbh Compact injection device with reduced steam bubble inclination
DE102008001331A1 (en) * 2008-04-23 2009-10-29 Robert Bosch Gmbh Compact injection device with flat anchor air actuator
WO2010112856A1 (en) * 2009-03-31 2010-10-07 Scion-Sprays Limited A fluid injector having a novel inlet valve arrangement
DE102009046091A1 (en) * 2009-10-28 2011-08-18 Robert Bosch GmbH, 70469 Injection device for internal combustion engine, particularly small motors, has fuel pump and injector, where fuel pump and injector are integral part of injection module

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