WO2008152651A2 - Commande électronique pour régulation de pression de carburant dans des systèmes d'injection de carburant - Google Patents

Commande électronique pour régulation de pression de carburant dans des systèmes d'injection de carburant Download PDF

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Publication number
WO2008152651A2
WO2008152651A2 PCT/IN2008/000359 IN2008000359W WO2008152651A2 WO 2008152651 A2 WO2008152651 A2 WO 2008152651A2 IN 2008000359 W IN2008000359 W IN 2008000359W WO 2008152651 A2 WO2008152651 A2 WO 2008152651A2
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WO
WIPO (PCT)
Prior art keywords
fuel
pressure
fuel injection
data set
engine
Prior art date
Application number
PCT/IN2008/000359
Other languages
English (en)
Other versions
WO2008152651A3 (fr
Inventor
K Sasikumar
K Senthur Pandian
Original Assignee
Ucal Fuel Systems 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 Ucal Fuel Systems Limited filed Critical Ucal Fuel Systems Limited
Publication of WO2008152651A2 publication Critical patent/WO2008152651A2/fr
Publication of WO2008152651A3 publication Critical patent/WO2008152651A3/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2422—Selective use of one or more tables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the subject matter described herein in general, relates to an electronic fuel injection system for an internal combustion engine of a vehicle and in particular, relates to an electronic control for fuel pressure regulation in an electronic fuel injection system.
  • a fuel injection system in a vehicle is utilized to deliver fuel under high pressure into a combustion chamber of an internal combustion engine or into the air flow in an intake manifold before entering the combustion chamber.
  • the fuel injection system works on a very narrow band of pressure.
  • EFI electronic fuel injection
  • An electronic control unit (ECU) is a central member of the EFI system and monitors various operating parameters, like engine speed and engine load, via various sensors. The ECU calculates the appropriate amount of the fuel to be injected into the intake manifold and the timing of the fuel injector opening, along with performing various other operations.
  • the amount of the fuel to be injected by a fuel injector of the EFI depends upon the four parameters, namely the density of the fuel, area of the fuel injector opening, differential pressure across the fuel injector, and the duration of the fuel injector opening. Conventionally, only a single parameter i.e. the duration of the fuel injector opening is varied by the ECU in order to control the injection of the fuel into the intake manifold.
  • the ECU utilizes various data sets, also referred to as maps, to determine the fuel injection by the fuel injector based on different operating conditions and a pre-determined gain value.
  • Fig. 1 illustrates a conventional system 100 implemented in the ECU to achieve fuel injection in a fuel injection system.
  • the system 100 determines the duration of opening of the fuel injector 102 at different operating conditions of the vehicle depending upon the two parameters, namely the required fuel quantity and gain value.
  • the different values of the required fuel quantity and the gain value are pre-stored within data sets or maps.
  • the gain value determines the time, in milliseconds, within which the fuel injector 102 opens to deliver one milligram of fuel.
  • the system 100 includes two pre-stored data sets i.e. a fuelling data set 104 and a fuel injection gain data set 106.
  • the quantity of fuel required to be injected by the injector at different operating conditions of the vehicle is determined by the fuelling data set 104.
  • the fuelling data set 104 is a standard data set depicting the relationship between the speed and the load of the engine.
  • the fuelling data set 104 includes multiple grids depicting different values corresponding to the quantity of fuel required at different loads and speeds of the engine.
  • the fuel injection gain data set 106 depicts a constant gain value that is different for different fuel injectors. The gain value is determined by the fuel injector manufacturer and is manually stored within the fuel injection gain data set 106.
  • a fuel injection duration module 108 calculates the duration of opening of the fuel injector 102 based on the outputs from the fuelling data set 104 and the fuel injection gain data set 106.
  • the calculation of the duration of opening of the fuel injector within the fuel injection duration module 108 is based on a constant differential pressure across the fuel injector 102 and a constant diameter of the fuel injector 102 opening for all operating conditions of the vehicle.
  • the constant differential pressure across the fuel injector 102 is maintained by a mechanical fuel pressure regulator provided in the EFI system.
  • the mechanical fuel pressure regulator utilizes a spring to achieve the constant differential pressure across the fuel injector 102 for all the operating conditions of the vehicle.
  • Such an EFI system results in an excessive amount of CO emissions.
  • a constant differential pressure across the fuel injector leads to inappropriate mixing of fuel within the intake manifold, thereby affecting fuel efficiency and fuel economy. This may lead to the reduced power output developed by the engine, thereby affecting the efficiency and reliability of the engine.
  • the subject matter described herein is directed to an electronic fuel injection (EFI) system for regulating fuel injection pressure at different operating conditions of a vehicle.
  • the EFI system includes a fuel injector, a variable fuel pressure unit and an electronic control unit (ECU).
  • the ECU operates the fuel injector and the variable fuel pressure unit with the help of inbuilt data sets and evaluating modules.
  • a first data set and a second data set, within the ECU, provide relationship between engine speed and engine load.
  • the first data set identifies the values for the required quantity of fuel to be injected in the intake manifold at different operating conditions of the vehicle.
  • the second data set identifies the differential pressure of the fuel across the fuel injector at different operating conditions of the vehicle.
  • a third data set is provided within the ECU that identifies multiple gain values based on the different differential pressures in the second data set.
  • the outputs from the first data set and the third data set are utilized by a first evaluating module for generating an output signal corresponding to the duration of fuel injector opening for a particular operating condition.
  • the output from the second data set along with intake manifold pressure value is utilized by a second evaluating module for generating an output signal corresponding to the pressure of fuel required within the fuel injector for a particular operating condition.
  • Fig. 1 illustrates a conventional system implemented in an ECU to achieve fuel injection in a fuel injection system.
  • Fig. 2 illustrates a variable pressure regulation system implemented in an ECU of an EFI system for delivery of fuel in an intake manifold of an internal combustion engine.
  • Fig. 2a illustrates a variable pressure regulation system depicting a differential pressure data set for obtaining differential pressure across a fuel injector in accordance with one embodiment of the present subject matter.
  • Fig. 2b illustrates the variable pressure regulation system depicting a fuel pressure data set in conjunction with the manifold pressure data set for obtaining differential fuel pressure across the fuel injector in accordance with another embodiment of the present subject matter.
  • Fig. 3 illustrates the variable pressure regulation system depicting various data sets and evaluating modules for varying the differential pressure across the fuel injector at different operating conditions of the vehicle.
  • the fuel injection system utilizes an ECU to regulate a fuel injector and a fuel pressure regulator. Multiple data sets and evaluating modules are provided within the ECU for calculating the fuel injector opening as well as the pressure variation at different operating conditions of the vehicle.
  • Fig. 2 illustrates a variable pressure regulation system 200 implemented in an
  • the ECU of an EFI system for delivery of fuel in an intake manifold of an internal combustion engine.
  • the EFI system includes a fuel injector 102 mounted on the intake manifold of the internal combustion engine.
  • a fuel pressure regulator is provided for regulating the pressure of fuel entering into the fuel injector 102.
  • the fuel injector 102 and the fuel pressure regulator are operated by the ECU of the EFI system.
  • the variable pressure regulation system 200 within the ECU determines the duration of opening of the fuel injector 102 and the variation in the differential pressure across the fuel injector 102 at different operating conditions of the vehicle.
  • the variable pressure regulation system 200 utilizes a plurality of data sets, also referred to as maps, and evaluating modules for operating the fuel injector 102 and the fuel pressure regulator.
  • a fuelling data set 104 determines the quantity of fuel, in milligrams, required to be injected into the engine at different operating conditions of the vehicle.
  • the fuelling data set 104 is a predefined data set that depicts the relationship between load and speed of the engine at different operating conditions of the vehicle.
  • the load on the engine is determined by a load sensor disposed within a throttle body of the engine whereas the speed of the engine is determined by a speed sensor disposed at a crankshaft of the engine.
  • the load sensor and speed sensor sends signals corresponding to the load and the speed of the engine respectively to the ECU at different operating conditions of the vehicle. For a particular operating condition, a value depicting the required quantity of fuel is determined by the fuelling data set 104.
  • the variable pressure regulation system 200 further includes a fuel injection gain data set 202 that provides different gain values for various differential pressures across the fuel injector 102.
  • the fuel injection gain data set 202 determines the time, in milliseconds, during which the fuel injector 102 needs to be opened in order to inject one milligram of fuel into the intake manifold.
  • the fuel injection gain data set 202 contains different gain values corresponding to various differential pressures across the fuel injector 102.
  • a duration evaluating module 204 determines the duration of fuel injector opening based on the outputs from the fuelling data set 104 and the fuel injection gain data set 202.
  • the differential pressure across the fuel injector 102 can be obtained with the help of a differential pressure data set or by using a fuel pressure data set in conjunction with a manifold pressure data set.
  • Fig. 2a illustrates the variable pressure regulation system 200 depicting the differential pressure data set 206 for obtaining differential pressure across the fuel injector 102 in accordance with one embodiment of the present subject matter.
  • the differential pressure data set 206 stores the values of differential pressures across the fuel injector 102 at different operating conditions of the vehicle.
  • the differential pressure data set 206 is a predefined data set that depicts the relationship between the load and speed of the engine at different operating conditions of the vehicle.
  • the differential pressure data set 206 has pre-stored values that correspond to the required differential pressures across the fuel injector 102 at different load and speed values of the engine. For a particular operating condition, a value depicting the differential pressure across the fuel injector 102 is determined by the differential pressure data set 206 and a corresponding gain value is selected from the fuel injection gain data set 202.
  • Fig. 2b illustrates the variable pressure regulation system 200 depicting the fuel pressure data set 208 in conjunction with the manifold pressure data set 210 for obtaining differential fuel pressure across the fuel injector 102 in accordance with another embodiment of the present subject matter.
  • the fuel pressure data set 208 depicts the relationship between the load and the speed of the engine at different operating conditions of the vehicle and indicates the operating fuel pressure value required at different speed and load values of the engine.
  • the manifold pressure data set 210 indicates the value of the pressure within the intake manifold at different operating conditions of the vehicle.
  • the manifold pressure data set 210 takes input from a manifold absolute pressure (MAP) sensor provided within the intake manifold.
  • the MAP sensor determines the absolute pressure within the intake manifold of the engine and sends the corresponding signals to the ECU.
  • the difference in the outputs obtained from the fuel pressure data set 208 and the manifold pressure data set 210 is calculated in a fuel pressure evaluating module 212.
  • the fuel pressure evaluating module 212 calculates a value corresponding to the differential fuel pressure required across the fuel injector 102 at a particular operating condition of the vehicle. Subsequently, a gain value corresponding to the value of the differential fuel pressure is selected from the fuel injection gain data set 202.
  • the duration of opening of the fuel injector 102 is calculated by the duration evaluating module 204.
  • the duration evaluating module 204 utilizes the outputs of the fuelling data set 104 and the fuel injection gain data set 202 for calculating the duration of the opening of the fuel injector 102 for the particular operating condition of the vehicle.
  • the duration evaluating module 204 produces a signal corresponding to the calculated value of the required fuel injector opening duration and sends this signal to the fuel injector 102.
  • the fuel injector 102 gets operated accordingly.
  • Fig. 3 illustrates the variable pressure regulation system 200 depicting various data sets and evaluating modules for varying the differential pressure across the fuel injector 102 at different operating conditions of the vehicle.
  • the variable pressure regulation system 200 utilizes the fuel pressure data set 208 and the manifold pressure data set 210 for calculating the fuel pressure required at different operating conditions of the vehicle.
  • the fuel pressure data set 208 provides the value for the fuel pressure required by the fuel injector 102 under a particular operating condition and the manifold pressure data set 210 provides the pressure within the intake manifold.
  • the fuel pressure evaluating module 212 calculates the difference of the outputs obtained from the fuel pressure data set 208 and the manifold pressure data set 210 and determines a value corresponding to the fuel pressure required in the fuel injector 102 for a particular operating condition of the vehicle.
  • the fuel pressure evaluating module 212 produces a signal, corresponding to the calculated value for the required fuel pressure and sends this signal to the variable fuel pressure unit 302.
  • the variable fuel pressure unit 302 on receiving the signal from the fuel pressure evaluating module 212, regulates the pressure of the fuel going into the fuel injector 102.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un système d'injection électronique de carburant (EFI) pour réguler la pression d'injection de carburant dans différentes conditions de fonctionnement d'un véhicule. Le système EFI comprend un bloc de commande électronique (ECU) pour commander un injecteur de carburant, un régulateur de pression de carburant au moyen d'ensembles de données incorporés et de modules d'évaluation. Les valeurs pour la quantité requise de carburant à injecter dans un collecteur d'admission et les valeurs pour des pressions différentielles du carburant à travers l'injecteur de carburant dans différentes conditions de fonctionnement du véhicule peuvent être obtenues à partir de différents ensembles de données. Ces valeurs sont évaluées par des moyens d'évaluation pour déterminer la durée de l'ouverture de l'injecteur de carburant pour une condition de fonctionnement particulière. Un autre ensemble de données fournit de multiples valeurs de gain basées sur les diverses pressions différentielles. Ces valeurs de gain sont utilisées ainsi qu'une valeur de pression de collecteur d'admission par un autre module d'évaluation, pour ainsi générer un signal de sortie correspondant à la pression du carburant requise à l'intérieur de l'injecteur de carburant dans diverses conditions de fonctionnement.
PCT/IN2008/000359 2007-06-11 2008-06-06 Commande électronique pour régulation de pression de carburant dans des systèmes d'injection de carburant WO2008152651A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1209/CHE/2007 2007-06-11
IN1209CH2007 2007-06-11

Publications (2)

Publication Number Publication Date
WO2008152651A2 true WO2008152651A2 (fr) 2008-12-18
WO2008152651A3 WO2008152651A3 (fr) 2009-05-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190463A (ja) * 1983-04-11 1984-10-29 Isuzu Motors Ltd 内燃エンジン用燃料供給装置
DE3704942A1 (de) * 1987-02-17 1988-08-25 Pierburg Gmbh Verfahren zum dosieren von brennstoff fuer eine gemischverdichtende brennkraftmaschine
FR2715440A1 (fr) * 1994-01-24 1995-07-28 Siemens Automotive Sa Procédé de commande de la quantité de carburant injecté dans un moteur à combustion interne.
US20060212208A1 (en) * 2005-03-18 2006-09-21 Takefumi Uchida Internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190463A (ja) * 1983-04-11 1984-10-29 Isuzu Motors Ltd 内燃エンジン用燃料供給装置
DE3704942A1 (de) * 1987-02-17 1988-08-25 Pierburg Gmbh Verfahren zum dosieren von brennstoff fuer eine gemischverdichtende brennkraftmaschine
FR2715440A1 (fr) * 1994-01-24 1995-07-28 Siemens Automotive Sa Procédé de commande de la quantité de carburant injecté dans un moteur à combustion interne.
US20060212208A1 (en) * 2005-03-18 2006-09-21 Takefumi Uchida Internal combustion engine

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