EP1961954A1 - Appareil de diagnostic multifonction pour moteur à essence ou diesel à injection directe, de préférence avec une technologie de type rampe commune - Google Patents

Appareil de diagnostic multifonction pour moteur à essence ou diesel à injection directe, de préférence avec une technologie de type rampe commune Download PDF

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Publication number
EP1961954A1
EP1961954A1 EP08003075A EP08003075A EP1961954A1 EP 1961954 A1 EP1961954 A1 EP 1961954A1 EP 08003075 A EP08003075 A EP 08003075A EP 08003075 A EP08003075 A EP 08003075A EP 1961954 A1 EP1961954 A1 EP 1961954A1
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EP
European Patent Office
Prior art keywords
engine
components
pressure
processing
control means
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.)
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Application number
EP08003075A
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German (de)
English (en)
Inventor
Massimo Derossi
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.)
Derossi Massimo Srl
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Derossi Massimo Srl
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Publication date
Application filed by Derossi Massimo Srl filed Critical Derossi Massimo Srl
Publication of EP1961954A1 publication Critical patent/EP1961954A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a multipurpose diagnostics apparatus for a direct-injection petrol or diesel engine that preferably uses common-rail technology.
  • the invention regards an apparatus that enables verification of operation of the parts of the injection system of an engine, overcoming the limits of common self-diagnostics systems that are installed on automobiles or that may be applied thereto.
  • the fuel-supply system of common-rail engines is one of the most delicate aspects and hence one that most frequently must undergo repair.
  • the fuel-supply system of a common-rail engine can be divided into:
  • the fuel-supply system is controlled by the engine electronic control unit by means of a cross-check of the fuel-pressure sensor and the duty cycle of the high-pressure regulator. Consequently, whenever a problem arises in the fuel-supply system, said engine electronic control unit detects an error in the pressure regulation of the fuel, without specifying which component presents the failure. For instance, the engine electronic control unit is unable to distinguish between the following faults:
  • the engine electronic control unit irrespective of the faults present, would always detect the same error of regulation of the fuel pressure.
  • the car mechanic will be faced with the problem of trying to understand which element of the system needs to be replaced, since the self-diagnostics system is unable to carry out either activation of the pressure regulator and of the flow regulator or control of the injector.
  • a proper diagnosis would entail the use of different types of equipment and/or additional personnel, and this would in turn entail high costs in terms of money.
  • the purpose of the present invention is to propose a diagnostics device that is simple to use and that will enable clear identification of the various faults present in the fuel-supply system directly on the vehicle being tested, and in particular, for instance:
  • a multipurpose diagnostics apparatus for an engine, said apparatus comprising: a central unit provided with processing and control means and interface means for interaction between the user and said processing and control means; and connection means, via which said central unit can be connected to one or more components of said engine according to different configurations; said processing and control means enabling the operator to carry out tests on operation of one or more components of the high-pressure electro-hydraulic part, activating autonomously the components being tested and measuring the operating parameters, and subsequently correlating the values obtained from said tests and from said measurements with one or more criteria that can be pre-set and selected using said interface means by said user so as to detect proper operation of each of said components individually.
  • connection means can comprise electrical cables.
  • said at least one electrical cable can connect said central unit to the supply battery of the vehicle undergoing troubleshooting.
  • said processing and control means may be programmable in order to enable said tests on operation to be carried out on said one or more components and applying said one or more pre-settable criteria.
  • said processing and control means comprise a microcontroller, an analog-to-digital converter, a generator of square-wave pulses with variable duty cycle, and a power unit.
  • said interface means can comprise a liquid-crystal display.
  • said interface means can comprise a pushbutton panel.
  • said pushbutton panel can comprise five pushbuttons.
  • said parameters can comprise the fuel pressure.
  • said components of said engine can comprise the pressure sensor.
  • said components of said engine can comprise a pressure regulator.
  • said components of said engine can comprise at least one coil injector or piezoelectric injector.
  • said engine can be a direct-injection petrol or diesel engine preferably with common-rail technology.
  • a fuel-supply system of a common-rail engine can be divided into a low-pressure system and a high-pressure system.
  • the former consists of a low-pressure pump, the function of which is to draw in the fuel from the tank and send it to the high-pressure pump.
  • the pressure of said pump is generally 2.5-3 bar.
  • the high-pressure system instead, consists of a so-called high-pressure pump, the function of which is to pressurize the fuel inside the common rail, which is designed to accumulate the fuel at a high pressure.
  • Regulation of the pressure at output is entrusted to a pressure regulator, which in general is set either on the rear part of the high-pressure pump or at the end of the common rail, or else to a flow regulator (some versions may be simultaneously equipped both with the pressure regulator and with the flow regulator). Said regulators are controlled by the engine electronic control unit, by means of a feedback connection with the pressure sensor fixed on said common rail.
  • Said fuel-pressure sensor has the function of detecting the pressure present in the common rail and sending to said engine electronic control unit a signal proportional to said pressure.
  • Said sensor envisages a socket with three connection wires: ground, 0.5-4.5-V signal, and 5-V supply.
  • the fuel accumulated in the common rail is sent, during operation of the engine, to the injectors by means of pipes, preferably made of metal.
  • the injector has the function of injecting the fuel into the engine cylinder and is controlled by the engine electronic control unit, by means of an electric control.
  • the interval of duration of said control varies, in any case, according to the type or version of engine.
  • multipurpose diagnostics apparatus 1 for an engine of the type described above.
  • Said apparatus 1 comprises a central unit 2, provided with a liquid-crystal display 3, and a pushbutton panel 4 having five pushbuttons (Enter, Start-Stop, Esc, Arrow-up and Arrow-down).
  • the apparatus 1 moreover comprises connection means 5, which enable connection of said apparatus to the system for supply of one or more parts of the engine in order to carry out the necessary diagnostics.
  • the display 3 is connected via an electrical flat conductor cable 6 to an electronic card 7, on which the pushbutton panel 4 is installed.
  • a programmable processing and control microcontroller 8 Also installed on said electronic card 7 is a programmable processing and control microcontroller 8 and the biasing passive circuit components.
  • connection means comprise the electrical cables 5', for connection to supply means, such as the battery of the engine of the motor vehicle on which the diagnostics is carried out, and the electrical cables 5'' for connection to the various components of said engine.
  • connection of the apparatus 1 according to the invention where there are distinguished a first part concerning checks on the vehicle and a second part regarding carrying out of the bench tests.
  • FIGS 3 and 3a show the configuration for checking efficiency of the pressure-regulator valve. The following steps are performed with the control board of the vehicle 9 on which troubleshooting is being carried out turned off:
  • the signal detected by the pressure sensor 10, once filtered by a filter 8', is processed by said microcontroller 8, which carries out an analog-to-digital conversion thereof.
  • FIGS. 4 and 4a show the configuration for checking efficiency of the flow-regulation valve. The following steps are performed with the control board of the vehicle 9 on which troubleshooting is being carried out turned off:
  • connection of the apparatus 1 can be performed simultaneously both with the flow regulator and with the pressure sensor 10.
  • the microcontroller 8 Once the microcontroller 8 has detected the signals measured by the pressure sensor 10 of the engine 9' of the automobile 9, it regulates the duty cycle under the control of a square-wave pulse generator 15 (the control modulation is of a PWM - Pulse Width Modulation - type).
  • the square wave is appropriately modulated to obtain control of the pressure regulator 11 and is amplified with a power unit 14, with which the apparatus 1 is equipped.
  • FIGS 5 and 5a show the configuration for checking operation of the fuel-pressure sensor 10 (high-pressure pressure gauge). In this configuration, with the control board turned off, the following operations are performed:
  • Figure 6 shows a configuration of connection in which said one central unit 2 is connected to an injector 13, for checking operation of the electronic part of the aforesaid injector.
  • the check on operation of an injector 13 can be carried out also on a piezoelectric injector.
  • Figure 7 shows the tree of the possible functions of the apparatus 1 according to the present invention.
  • the apparatus 1 enables selection of the type of test to carry out, such as tests on injectors, high-pressure gauge, and high-pressure pump.
  • the apparatus 1 also enables calibration of the test according to the make or type of component of the engine. In the case in point, the apparatus 1 is suitable for carryng out tests on Bosch ® and Delphi ® components.
  • the main advantage of the present invention is the possibility of carrying out tests on operation of the components of the high-pressure electro-hydraulic part without necessarily having to detach said components from the vehicle being tested, but, by controlling them directly, being able to analyse the reaction of the system in question, carry out measurements on operating parameters of an engine, and allow detection of proper operation of the components of an engine.
  • An advantage of the present invention is that of enabling management and control of: pumps and injectors that use common-rail technology (both diesel and petrol engines); fuel-pressure sensors; duty cycle in the control of the pressure regulator during the tests of engine starting/fluid tightness and control of the flow regulator during the tests of engine starting/fluid tightness; control of the high-pressure system by means of the appropriate wiring.

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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)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP08003075A 2007-02-23 2008-02-20 Appareil de diagnostic multifonction pour moteur à essence ou diesel à injection directe, de préférence avec une technologie de type rampe commune Withdrawn EP1961954A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20070128 ITTO20070128A1 (it) 2007-02-23 2007-02-23 Apparato di diagnosi multiuso per un motore a iniezione diretta benzina o diesel, preferibilmente con tecnologia a collettore comune (common rail).

Publications (1)

Publication Number Publication Date
EP1961954A1 true EP1961954A1 (fr) 2008-08-27

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Application Number Title Priority Date Filing Date
EP08003075A Withdrawn EP1961954A1 (fr) 2007-02-23 2008-02-20 Appareil de diagnostic multifonction pour moteur à essence ou diesel à injection directe, de préférence avec une technologie de type rampe commune

Country Status (2)

Country Link
EP (1) EP1961954A1 (fr)
IT (1) ITTO20070128A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2608425C1 (ru) * 2015-11-03 2017-01-18 Алексей Николаевич Звеков Комплекс бортовой диагностики системы подачи бензина и способ бортовой диагностики системы подачи бензина автомобильного двигателя внутреннего сгорания
RU2777159C1 (ru) * 2021-11-22 2022-08-01 Алексей Николаевич Звеков Сканер топливоподачи низкого давления и способ диагностики

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358499A (en) * 1964-09-29 1967-12-19 Fabrication De Material Electr Apparatus for the checking of a diesel engine
US4102181A (en) * 1975-12-23 1978-07-25 Autoipari Kutato Intezet Procedure for determining the starting point of fuel injection especially for running internal-combustion engines
GB2117048A (en) * 1982-03-18 1983-10-05 Triangle Corp Testing and I.C. engine fuel injection system
GB2393217A (en) * 2002-07-16 2004-03-24 Bosch Gmbh Robert Test rig system with interchangeable base plates, eg for testing fuel injection components
US20050005880A1 (en) * 2003-07-11 2005-01-13 Bale Carlton G. System for modifying fuel pressure in a high-pressure fuel injection system for fuel system leakage testing
WO2005068807A2 (fr) * 2004-01-09 2005-07-28 Michigan Custom Machines, Inc. Systemes, procedes et machine de test de fluide
WO2007007558A1 (fr) * 2005-07-13 2007-01-18 Toyota Jidosha Kabushiki Kaisha Dispositif diagnostique pour soupape de decharge electromagnetique dans un dispositif d’alimentation en carburant
WO2007031492A1 (fr) * 2005-09-15 2007-03-22 Robert Bosch Gmbh Procede et dispositif de surveillance d'un systeme de dosage de carburant
US20070079808A1 (en) * 2005-10-06 2007-04-12 Denso Corporation Fuel injection system designed to ensure enhanced reliability of diagnosis of valve

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358499A (en) * 1964-09-29 1967-12-19 Fabrication De Material Electr Apparatus for the checking of a diesel engine
US4102181A (en) * 1975-12-23 1978-07-25 Autoipari Kutato Intezet Procedure for determining the starting point of fuel injection especially for running internal-combustion engines
GB2117048A (en) * 1982-03-18 1983-10-05 Triangle Corp Testing and I.C. engine fuel injection system
GB2393217A (en) * 2002-07-16 2004-03-24 Bosch Gmbh Robert Test rig system with interchangeable base plates, eg for testing fuel injection components
US20050005880A1 (en) * 2003-07-11 2005-01-13 Bale Carlton G. System for modifying fuel pressure in a high-pressure fuel injection system for fuel system leakage testing
WO2005068807A2 (fr) * 2004-01-09 2005-07-28 Michigan Custom Machines, Inc. Systemes, procedes et machine de test de fluide
WO2007007558A1 (fr) * 2005-07-13 2007-01-18 Toyota Jidosha Kabushiki Kaisha Dispositif diagnostique pour soupape de decharge electromagnetique dans un dispositif d’alimentation en carburant
EP1903210A1 (fr) * 2005-07-13 2008-03-26 Toyota Jidosha Kabushiki Kaisha Dispositif diagnostique pour soupape de decharge electromagnetique dans un dispositif d alimentation en carburant
WO2007031492A1 (fr) * 2005-09-15 2007-03-22 Robert Bosch Gmbh Procede et dispositif de surveillance d'un systeme de dosage de carburant
US20070079808A1 (en) * 2005-10-06 2007-04-12 Denso Corporation Fuel injection system designed to ensure enhanced reliability of diagnosis of valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2608425C1 (ru) * 2015-11-03 2017-01-18 Алексей Николаевич Звеков Комплекс бортовой диагностики системы подачи бензина и способ бортовой диагностики системы подачи бензина автомобильного двигателя внутреннего сгорания
RU2777159C1 (ru) * 2021-11-22 2022-08-01 Алексей Николаевич Звеков Сканер топливоподачи низкого давления и способ диагностики

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