WO2008149384A1 - Système d'injection de carburant à pression variable - Google Patents

Système d'injection de carburant à pression variable Download PDF

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Publication number
WO2008149384A1
WO2008149384A1 PCT/IN2008/000357 IN2008000357W WO2008149384A1 WO 2008149384 A1 WO2008149384 A1 WO 2008149384A1 IN 2008000357 W IN2008000357 W IN 2008000357W WO 2008149384 A1 WO2008149384 A1 WO 2008149384A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pressure
chamber
injection system
inlet line
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.)
Ceased
Application number
PCT/IN2008/000357
Other languages
English (en)
Inventor
K Sasikumar
K Senthur Pandian
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.)
UCAL FUEL SYSTEMS Ltd
Original Assignee
UCAL FUEL SYSTEMS Ltd
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 UCAL FUEL SYSTEMS Ltd filed Critical UCAL FUEL SYSTEMS Ltd
Publication of WO2008149384A1 publication Critical patent/WO2008149384A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • F02M69/20—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air the device being a servo-motor, e.g. using engine intake air pressure or vacuum
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators

Definitions

  • the present subject matter in general, relates to a fuel injection system of a vehicle and in particular, relates to a variable pressure fuel injection system with an electronically controlled fuel pressure regulator.
  • Fuel pressure regulators are provided in a fuel injection system of a vehicle to maintain a desired fuel pressure across a fuel injector.
  • a fuel pressure regulator eliminates sudden and undesirable fluctuations occurring in the fuel pressure in order to ascertain atomization of fuel injected by the fuel injector. Appropriate atomization of fuel is essential in order to maintain fuel economy and substantial reduction in the emission rate.
  • a mechanical fuel pressure regulator is located in a fuel inlet line between a fuel pump and the fuel injector for maintaining a constant pressure across the fuel injector at a predetermined pressure.
  • the mechanical fuel pressure regulator has an air reference chamber and a fuel reference chamber .separated by a diaphragm.
  • a spring with a known spring rate is provided in the air reference chamber of the mechanical fuel pressure regulator. The rating of the spring determines the magnitude of fuel pressure to be maintained in the fuel reference chamber and consequently in the fuel inlet line.
  • the desired pressure of fuel across the fuel injector is preset by the manufacturer of the pressure regulator. However, . setting the fuel pressure at a preset value does not ensure optimum atomization of fuel at all operating conditions of the vehicle. This may affect fuel efficiency and fuel economy, thereby leading to reduced power output developed by the engine. Further, inappropriate air-fuel mixture may hamper the efficiency and reliability of the engine, in addition to increased amount of emissions.
  • variable pressure fuel injection system comprising a fuel inlet line, a fuel outlet line and a fuel injector.
  • the fuel injector is hydraulically connected to the fuel inlet line and injects the pressurized fuel into the engine.
  • the variable pressure fuel injection system further comprises a control system having an electronically controlled fuel pressure regulator hydraulically connecting the fuel inlet line and the fuel outlet line.
  • the fuel pressure regulator includes a housing having an inlet chamber, an outlet chamber and a passage connecting the inlet chamber and the outlet chamber.
  • the inlet chamber is connected to the fuel inlet line whereas the outlet chamber is connected to the fuel outlet line.
  • the fuel pressure regulator also includes an actuator assembly having a movable armature and a coil that encloses the movable armature.
  • the movable armature controls the flow of fuel from the inlet chamber to the outlet chamber.
  • the variable pressure fuel injection system further comprises an electronic control unit that energizes the coil based on different operating conditions, thereby reciprocating the movable armature to regulate fuel pressure entering into the fuel injector at different operating conditions.
  • a pressure sensor is also disposed in the fuel inlet line. The pressure sensor measures the pressure in the fuel inlet line and communicates with the electronic control unit for control of the fuel pressure regulator.
  • variable pressure fuel injection system comprises the fuel inlet line, the fuel outlet line and the fuel injector.
  • the fuel injector is hydraulically connected to the fuel inlet line.
  • the fuel injector injects pressurized fuel to the engine.
  • the variable pressure fuel injection system includes a control system having a fuel pressure regulator hydraulically connecting the fuel inlet line and the fuel outlet line.
  • the fuel pressure regulator includes a housing having an actuator chamber and a fuel chamber. The actuator chamber and the fuel chamber are separated by a diaphragm.
  • An actuator assembly is disposed in the actuator chamber.
  • the actuator assembly includes a movable armature and a coil enclosing the movable armature.
  • a pressure plate assembly is disposed in the fuel chamber.
  • the pressure plate assembly is attached to the movable armature for regulating flow of fuel from the fuel inlet line to the fuel outlet line.
  • An electronic control unit is provided in the variable pressure fuel injection system that energizes the coil based on different operating conditions, thereby reciprocating the movable armature to regulate the fuel pressure entering into the fuel injector.
  • a pressure sensor is disposed in the fuel inlet line for measuring the pressure in the fuel inlet line. The pressure sensor communicates with the electronic control unit for precise control of the fuel pressure regulator.
  • FIG 1 shows a block diagram of a variable pressure fuel injection system of a vehicle.
  • FIG 2 shows a sectional view of a fuel pressure regulator of a variable pressure fuel injection system of a vehicle according to a first embodiment of the present subject matter.
  • FIG 3 shows a perspective view of the fuel pressure regulator of a variable pressure fuel injection system of a vehicle shown in Fig. 2.
  • FIG 4 shows a sectional view of the fuel pressure regulator of a variable pressure fuel injection system of a vehicle according to a second embodiment of the present subject matter.
  • FIG.5 shows a sectional view of the fuel pressure regulator of a variable pressure fuel injection system of a vehicle according to a third embodiment of the present subject matter.
  • the subject matter described herein is directed to a variable pressure fuel injection system of a vehicle and in particular relates to a variable pressure fuel injection system with an electronically controlled fuel pressure regulator.
  • the present subject matter proposes a solution to maximize the fuel efficiency of the vehicle by electronically varying the pressure of the fuel injected inside an engine cylinder at different operating conditions of the vehicle. In addition to higher fuel economy, lower emission rates are also achieved by the present subject matter as proper atomization of the injected fuel is ensured.
  • FIG.l shows a block diagram of a variable pressure fuel injection system of a vehicle.
  • the variable pressure fuel injection system utilizes a control system for regulating the pressure of fuel to be injected into an internal combustion engine 102.
  • the control system includes an electronic fuel pressure regulator 104, an electronic control unit (ECU) 106 and a pressure sensor 108. Regulation of fuel pressure is mainly controlled by employing the fuel pressure regulator 104, which is electronically controlled by the ECU 106.
  • the ECU 106 is aided by the pressure sensor 108 that monitors the pressure of the fuel from a fuel pump 110 entering into a fuel injector 112.
  • the fuel pump 110 pumps the fuel from the fuel tank 100 into the fuel injector 112 and the fuel pressure regulator 104.
  • the fuel, pumped by the fuel pump 110 is at a certain pressure called as forward fuel pressure. Subsequently, when fuel approaches the fuel injector 112, it experiences a backward fuel pressure due to the closed state of the injector 112. The fuel with a pressure equal to the difference in the forward and backward fuel pressures enters the fuel pressure regulator 104.
  • the pressure sensor 108 is provided in line between the fuel pump 110 and the fuel injector 112 to constantly monitor the pressure of fuel entering the fuel injector 112. Whenever the pressure of fuel entering the fuel injector 112 exceeds a certain predetermined threshold value, the pressure sensor 108 alerts the ECU 106. On receiving the alert signals from the pressure sensor 108, the ECU 106 communicates with the fuel pressure regulator 104. Depending upon the magnitude of rise in fuel pressure beyond the threshold value, the fuel pressure regulator 104 allows the excess fuel to drain into the fuel tank 100. This leads to the reduction of the back fuel pressure, thereby reducing the pressure of fuel entering the fuel injector 112.
  • FIG2 shows a sectional view of the fuel pressure regulator 104 of the variable pressure fuel injection system of the vehicle according to a first embodiment of the present subject matter.
  • the fuel pressure regulator 104 is hydraulically connected to a fuel inlet line 200 and a fuel outlet line 202.
  • the fuel pressure regulator 104 of the present embodiment is configured as a solenoid valve.
  • the fuel pressure regulator 104 includes a housing 204 having an inlet chamber 206, an outlet chamber 208 and a passage connecting the inlet chamber 206 and the outlet chamber 208.
  • the inlet chamber 206 is connected to the fuel inlet line 200 whereas the outlet chamber 208 is connected to the fuel outlet line 202.
  • the housing 204 is a two piece assembly having a cap 210 and a mounting block 212.
  • the housing 204 can be a single piece in structure.
  • the fuel pressure regulator 104 further comprises an actuator assembly having a coil 214 and a movable armature 216 enclosed within the coil 214.
  • the movable armature 216 is provided within the passage connecting the inlet chamber 206 and the outlet chamber 208 and controls the flow of fuel from the inlet chamber 206 to the outlet chamber 208.
  • the fuel pressure regulation is achieved by energizing the coil 214 placed within the cap 210.
  • the pressure sensor 108 measures this pressure and immediately sends corresponding signals to the ECU 106.
  • the ECU 106 on receiving signals from the pressure sensor 108 energizes the coil 214, thereby resulting in reciprocating movement of the movable armature 216.
  • the reciprocating movement of the movable armature 216 leads to opening of the passage between the inlet chamber 206 and the outlet chamber 208, thereby leading to draining of fuel with excess pressure back into the fuel tank 100.
  • FIG.3 shows a perspective view of the fuel pressure regulator 104 of the variable pressure fuel injection system of the vehicle according to the first embodiment of the present subject matter.
  • the fuel inlet line 200 is disposed at the cap 210 whereas the fuel outlet line 202 is disposed at the mounting block 212.
  • FIG.4 shows a sectional view of the fuel pressure regulator 104 of the variable pressure fuel injection system of the vehicle according to a second embodiment of the present subject matter.
  • the fuel pressure regulator 104 is configured as a stepper motor 400.
  • the stepper motor 400 is electronically controlled by the ECU 106.
  • the fuel pressure regulator 104 includes a housing having a fuel chamber 402 and an actuator chamber 404 separated by a diaphragm 406.
  • the fuel inlet line 200 and the fuel outlet line are provided in the fuel chamber 402 of the fuel pressure regulator 104.
  • the movable armature 216 is disposed in the actuator chamber 404 and is coupled to a pressure plate assembly 408.
  • the pressure plate assembly 408 is disposed in the fuel chamber 402 and controls the flow of fuel from the fuel inlet line 200 to the fuel outlet line 202
  • the pressure sensor 108 senses this pressure rise and sends certain signals to the ECU 106.
  • the ECU 106 then regulates the pressure of the fuel at an optimum level by energizing the coil 214 thereby causing the reciprocating movement of the movable armature 216. This causes the pressure plate assembly 408 to move up with the movable armature 216, leading to the opening of the fuel outlet line 202, thereby bleeding the excess fuel to the fuel tank 100.
  • FIG.5 shows a sectional view of the fuel pressure regulator 104 of the variable pressure fuel injection system of the vehicle according to a third embodiment of the present subject matter.
  • the movable armature 216 is integrated with a metering needle 500.
  • the metering needle 500 has a tapered end 502.
  • the tapered end 502 of the metering needle 500 characterizes the closing for the fuel outlet line 202.
  • the rise in pressure of the fuel above the threshold value causes the stepper motor 400 to lift the metering needle 500.
  • the position of the tapered end 502 of the metering needle 500 determines the size of the aperture created for bleeding the fuel out to the fuel tank 100.
  • the present subject matter proposes a solution to maximize the fuel efficiency of the vehicle.
  • low emission rate is also achieved by effectively and efficiently varying the pressure of the fuel according to different operating conditions of the vehicle. Variation of fuel pressure according to the operating conditions of the vehicle leads to proper atomization of the fuel. This results in proper burning of the fuel which consequently leads to increase in fuel economy and reduction in the emission rates.

Landscapes

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

Abstract

L'invention concerne un système d'injection de carburant à pression variable conçu pour un véhicule. Ce système utilise un régulateur de pression de carburant à commande électronique (104) afin de réguler la pression du carburant dans un injecteur de carburant (112) dans différentes conditions de fonctionnement du véhicule. Ce régulateur de pression (104) est commandé par une unité de commande électronique (106) et comprend un ensemble plongeur et une bobine. L'unité de commande électronique assistée du détecteur de pression (108), assure l'atomisation optimale du carburant injecté au moyen de la variation électronique de la pression du carburant, ce qui permet d'optimiser le rendement du moteur.
PCT/IN2008/000357 2007-06-08 2008-06-06 Système d'injection de carburant à pression variable Ceased WO2008149384A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1196/CHE/2007 2007-06-08
IN1196CH2007 2007-06-08

Publications (1)

Publication Number Publication Date
WO2008149384A1 true WO2008149384A1 (fr) 2008-12-11

Family

ID=39870375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2008/000357 Ceased WO2008149384A1 (fr) 2007-06-08 2008-06-06 Système d'injection de carburant à pression variable

Country Status (1)

Country Link
WO (1) WO2008149384A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9243588B2 (en) 2012-09-20 2016-01-26 Ford Global Technologies, Llc Variable pressure gaseous fuel regulator
US9359963B2 (en) 2012-09-20 2016-06-07 Ford Global Technologies, Llc Gaseous fuel rail depressurization during inactive injector conditions

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073318A (en) * 1980-03-24 1981-10-14 Nissan Motor Ic engine fuel injection control system
US4310142A (en) * 1980-03-13 1982-01-12 Tom Mcguane Industries, Inc. Fuel pressure regulator assembly
EP0072034A2 (fr) * 1981-08-11 1983-02-16 Mitsubishi Denki Kabushiki Kaisha Système d'injection de carburant pour moteurs à combustion interne et un moteur équipé d'un tel système
JPS5943932A (ja) * 1982-09-02 1984-03-12 Mitsubishi Electric Corp 機関の燃料圧力調整装置
DE10016242A1 (de) * 2000-03-31 2001-10-04 Siemens Ag Druckregelventil mit integrierter Sicherheitsfunktion
EP1234976A2 (fr) * 2001-02-17 2002-08-28 Pierburg GmbH Système de soupape de régulation de pression d'alimentation en carburant pour un moteur à combustion
EP1291520A2 (fr) * 2001-09-07 2003-03-12 Pierburg GmbH Système de contrôle de la pression
DE102004020941B3 (de) * 2004-04-28 2006-01-05 Pierburg Gmbh Druckregelanordnung
EP1826394A2 (fr) * 2006-02-27 2007-08-29 Denso Corporation Actionneur électromagnétique à réponse rapide

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310142A (en) * 1980-03-13 1982-01-12 Tom Mcguane Industries, Inc. Fuel pressure regulator assembly
GB2073318A (en) * 1980-03-24 1981-10-14 Nissan Motor Ic engine fuel injection control system
EP0072034A2 (fr) * 1981-08-11 1983-02-16 Mitsubishi Denki Kabushiki Kaisha Système d'injection de carburant pour moteurs à combustion interne et un moteur équipé d'un tel système
JPS5943932A (ja) * 1982-09-02 1984-03-12 Mitsubishi Electric Corp 機関の燃料圧力調整装置
DE10016242A1 (de) * 2000-03-31 2001-10-04 Siemens Ag Druckregelventil mit integrierter Sicherheitsfunktion
EP1234976A2 (fr) * 2001-02-17 2002-08-28 Pierburg GmbH Système de soupape de régulation de pression d'alimentation en carburant pour un moteur à combustion
EP1291520A2 (fr) * 2001-09-07 2003-03-12 Pierburg GmbH Système de contrôle de la pression
DE102004020941B3 (de) * 2004-04-28 2006-01-05 Pierburg Gmbh Druckregelanordnung
EP1826394A2 (fr) * 2006-02-27 2007-08-29 Denso Corporation Actionneur électromagnétique à réponse rapide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9243588B2 (en) 2012-09-20 2016-01-26 Ford Global Technologies, Llc Variable pressure gaseous fuel regulator
US9359963B2 (en) 2012-09-20 2016-06-07 Ford Global Technologies, Llc Gaseous fuel rail depressurization during inactive injector conditions

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