WO2019117785A1 - A method for checking the functionality of individual pumping elements of a high-pressure pump in a high-pressure accumulator fuel injection system - Google Patents
A method for checking the functionality of individual pumping elements of a high-pressure pump in a high-pressure accumulator fuel injection system Download PDFInfo
- Publication number
- WO2019117785A1 WO2019117785A1 PCT/SE2018/051247 SE2018051247W WO2019117785A1 WO 2019117785 A1 WO2019117785 A1 WO 2019117785A1 SE 2018051247 W SE2018051247 W SE 2018051247W WO 2019117785 A1 WO2019117785 A1 WO 2019117785A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- pumping element
- development
- pressure accumulator
- pumping
- Prior art date
Links
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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/226—Fail safe control for fuel injection pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- 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
-
- 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
- F02M63/0265—Pumps feeding common rails
- F02M63/027—More than one high pressure pump feeding a single common rail
-
- 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
- F02M65/002—Measuring fuel delivery of multi-cylinder injection pumps
-
- 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
- F02M65/003—Measuring variation of fuel pressure in high pressure line
Definitions
- the present invention relates to a method for checking the functionality of individual pumping elements of a high-pressure pump in a high-pressure accumulator fuel injection system of an internal combustion engine, in which said system comprises:
- a high-pressure accumulator a high-pressure pump with a plurality of pumping elements connected in parallel to sequentially feed fuel to the high-pressure accumulator and at least one injector connected to the high-pressure accumulator for injecting fuel into a cylinder of the engine, as well as an arrangement for carrying out such a method according to the preamble of the appended independent arrangement claim.
- the invention is not restricted to such methods carried out for a high-pressure accumulator fuel injection system for injection of any particular fuel, into a cylinder or cylinders of an internal combustion engine, but diesel and ethanol may be mentioned by way of examples. Furthermore, the invention relates to such systems for internal combustion engines designed for any type of use, such as in industrial applications, in grinding machines and all types of motor vehicles, although the invention is particularly applicable to utility vehicles, especially wheeled utility vehicles, such as trucks or lorries and buses.
- the pressure inside the high-pressure accumulator may be kept at a desired level, but when problems to obtain this occur there are multiple components in the fuel feeding system to which the high- pressure accumulator fuel injection system belongs that could cause these problems, such as a clogged fuel filter, a leaking IMV (Inlet Metering Valve), bad venturi, bad inlet valve of the high- pressure pump and lost high pressure pump capacity. This makes it hard to pinpoint which of these components that is causing the problem.
- IMV Inlet Metering Valve
- US 6 526 948 discloses a method of the type defined in the introduction through which measures are taken for detecting malfunctions of individual pumping elements of the high-pressure pump in a high-pressure accumulator fuel injection system of an internal combustion engine in a motor vehicle. This is done by measuring pressure changes in the high-pressure accumulator depending upon changes occurring in the individual pumping elements. An average pressure increase is determined for each individual pumping element and these pressure increases are compared with each other for determining any defect of any pumping element. These measurements are, however, rather complicated and it is a desire to improve the reliability thereof.
- the object of the present invention is to provide a method and an arrangement of the type defined in the introduction being improved in at least some aspect with respect to such methods and arrangements already known.
- each pumping element may be determined by determining that there is a malfunction of a pumping element having a said development of pressure measuring values increasing less than a predetermined proportion of the development of pressure measuring values of the pumping element having the development with the highest increase.
- the pumping element with a said development with the highest increase will then function as a reference.
- This method will deliver a highly reliable result, since each stroke of each pumping element properly functioning shall with the injectors closed result in substantially the same pressure increase inside the high-pressure accumulator, so that a stroke of a pumping element resulting in a pressure increase being less than a predetermined proportion of the pressure increase resulted from the stroke of the pumping element having the highest such increase will be a reliable indication that this pumping element does not function properly.
- this method it is possible to rule out, or pinpoint, certain issues with the high-pressure pump and rule out errors that will affect the pumping elements equally, such as temperature, leakage, bad venturi and so on.
- said predetermined proportion is 70 %, 80 %, 90 % or 95 %. If a pumping element does not function properly it should show a pressure increase inside the high-pressure accumulator caused by a stroke thereof being less than 80 % and in most cases less than 70 % of a pressure increase caused by a stroke of the pumping element functioning as reference. Already a minor defect of a pumping element, such as a reduced performance due to a large gap between barrel and plunger, will result in a said pressure increase being less than the predetermined proportion and by that detectable as a malfunction of that pumping element.
- it is a high fuel flow in the form of a maximum fuel flow that is demanded when driving the high-pressure pump. It is suitable but not necessary to demand a maximum fuel flow when carrying out the method according to the invention.
- said determining step comprises a determining that the pumping element having a said development of pressure measuring values increasing most functions properly, and said development of this pumping element is taken as a reference for evaluation of the function of each other pumping element.
- an engine of a motor vehicle such as a wheeled motor vehicle, especially in the form of a truck or a lorry or a bus.
- the method according to the invention is particularly suitable to be carried out when such a motor vehicle is subjected to maintenance work for checking the proper function of the high-pressure pump of the high-pressure accumulator fuel injection system of said engine to replace a pumping element or any defect component thereof.
- the object of the present invention is with respect to the arrangement for checking the functionality of individual pumping elements in a high-pressure accumulator fuel injection system of an internal combustion engine obtained by providing an arrangement according to the independent claim directed thereto. Advantages of such an arrangement and the embodiment thereof defined in the dependent claim appear clearly from the above discussion of the method according to the invention and embodiments thereof.
- the invention also relates to a computer program, a computer readable medium, an electronic control unit, an internal combustion engine and a motor vehicle according to the appended claims directed thereto.
- Fig. 1 is a simplified schematic view showing a motor vehicle with an internal combustion engine having a high-pressure accumulator fuel injection system upon which the method according to the present invention is applicable,
- Fig. 2 is a graph of the pressure P measured inside the high-pressure accumulator of an internal combustion engine of the type shown in Fig. 1 versus time t while carrying out the method according to an embodiment of the present invention
- Fig. 3 is a graph illustrating the effect of the pumping strokes of the individual pumping elements on the pressure measured inside the high-pressure accumulator when carrying out the method according to said embodiment
- Fig. 4 is a flow chart illustrating the steps carried out in a method according to said embodiment of the invention
- Fig. 5 illustrates schematically an electronic control unit according to the invention .
- FIG. 1 A part of an internal combustion engine 1 in a motor vehicle 2 with a plurality (six) of cylinders 3 and a high-pressure accumulator fuel injection system to which a method according to the invention is applicable is very schematically illustrated in Fig. 1 .
- This system comprises a high-pressure accumulator 4 or a common rail with one injector 5 for each cylinder connected thereto for injecting fuel into a cylinder of the engine.
- a high-pressure pump 6 is configured to feed fuel to the high-pressure accumulator 4 and has for that sake two pumping elements 7, 8 connected in parallel and controlled by a control unit 9 to pump sequentially.
- Each such pumping element has a separate inlet valve 10, 1 1 controlled by said control unit 9 and connected to an I MV 12 of the pump connecting the pump 6 to a low pressure part of the fuel feeding system of the vehicle.
- a sensor 13 is configured to measure the fuel pressure prevailing in the high-pressure accumulator 4 at a frequency resulting in a plurality of pressure measuring values during each stroke of each pumping element 7, 8 and send information thereof to a member 14 integrated with the control unit 9 and configured to evaluate the pressure measuring values obtained through the pressure sensor.
- the method according to the present invention is directed to check the proper function of the individual pumping elements 7, 8 of the high-pressure pump, and this is done by driving the high-pressure pump while demanding a high fuel flow, in this case a maximum fuel flow, therefrom, and simultaneously controlling the injectors 5 to be closed.
- the pressure inside the high-pressure accumulator 4 is during this driving of the pump measured by the sensor 13 by high speed sampling , i.e. at a frequency resulting in a plurality, such as more than 20, measurements during a pump stroke of each pumping element.
- FIG. 2 shows the development of the pressure P inside the high-pressure accumulator 4 versus time t and how the pressure is increasing somewhat (A) during pump strokes of one of the pumping elements followed by an increase being more than twice as high (B) during a pump stroke of the other pumping element.
- the graph shown in Fig. 3 shows the pressure increase Dr obtained through each pump stroke of the pumping element 7 (PS7) and the pumping element 8 (PS8) clearly pointing out that there is a malfunction of the pumping element 8.
- Fig. 4 illustrates a flow chart of a method according to an embodiment of the present invention carried out for a high- pressure accumulator fuel injection system of an internal combustion engine of the type shown in Fig . 1 for checking the functionality of individual pumping elements of a high-pressure pump of said system.
- the method is started with the step Si of continuing to drive the high-pressure pump at a high fuel flow demand.
- the injector(-s) of the high- pressure accumulator is kept closed as defined as a step S 2 .
- the pressure inside the high-pressure accumulator is measured at high frequency during each stroke of each pumping element in a step S 3 .
- a subsequent step S 4 the development of the pressure measuring values of each pumping element is compared with that of the other pumping elements. Then in a step S 5 the question is asked: Has a pumping element during a pump stroke a development of pressure measuring values increasing less than a predetermined proportion of pressure measuring values of the pumping element having the development with the highest increase? When the answer to this question is yes it is in a step Se determined that there is a malfunction of the pumping element, and if the answer to the question is no it is in a step S 7 determined that there is no malfunction of that pumping element.
- Computer program code for implementing a method according to the invention is with advantage included in a computer program which can be read into the internal memory of a computer, e.g. the internal memory of an electronic control unit of a motor vehicle.
- a computer program is with advantage provided via a computer program product comprising a data storage medium which can be read by a computer and which has the computer program stored on it.
- Said data storage medium is for example an optical data storage medium in the form of a CD ROM disc, a DVD disc etc., a magnetic data storage medium in the form of a hard disc, a diskette, a cassette tape etc., or a flash memory or a memory of the ROM, PROM, EPROM or EEPROM type.
- FIG. 5 illustrates very schematically an electronic control unit 9 comprising an execution means 15, e.g. a central processor unit (CPU), for execution of computer software.
- the execution means 15 communicates with a memory 16, e.g. of the RAM type, via a data bus 17.
- the control unit 9 comprises also a non-transitory data storage medium 18, e.g. in the form of a flash memory or a memory of the ROM, PROM, EPROM or EEPROM type.
- the execution means 15 communicates with the data storage medium 18 via the data bus 17.
- a computer program comprising computer program code for implementing a method according to the invention, e.g. in accordance with the embodiment illustrated in Fig. 4, is stored on the data storage medium 18.
- the pump does not have to be a so-called IMV-pump with an Inlet Metering Valve at the inlet of the pumping elements, but it may be of any other conceivable type having at least two pumping elements, such as an AIM-pump having an actively controlled inlet valve for each pumping element subjected to Active Inlet Metering.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112020010884-7A BR112020010884A2 (en) | 2017-12-13 | 2018-12-05 | method for verifying the functionality of individual pumping elements of a high pressure pump in a fuel injection system with a high pressure accumulator |
DE112018005798.4T DE112018005798T5 (en) | 2017-12-13 | 2018-12-05 | Method for checking the functionality of individual pump elements of a high-pressure pump in a high-pressure storage fuel injection system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1751533A SE541906C2 (en) | 2017-12-13 | 2017-12-13 | A method for checking the functionality of individual pumping elements of a high-pressure pump in a high-pressure accumulator fuel injection system |
SE1751533-9 | 2017-12-13 |
Publications (1)
Publication Number | Publication Date |
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WO2019117785A1 true WO2019117785A1 (en) | 2019-06-20 |
Family
ID=66820556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2018/051247 WO2019117785A1 (en) | 2017-12-13 | 2018-12-05 | A method for checking the functionality of individual pumping elements of a high-pressure pump in a high-pressure accumulator fuel injection system |
Country Status (4)
Country | Link |
---|---|
BR (1) | BR112020010884A2 (en) |
DE (1) | DE112018005798T5 (en) |
SE (1) | SE541906C2 (en) |
WO (1) | WO2019117785A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113357032A (en) * | 2021-06-29 | 2021-09-07 | 东风汽车集团股份有限公司 | High-pressure oil pump fault detection post-processing method and electronic equipment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022202976A1 (en) | 2022-03-25 | 2023-09-28 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method for detecting a defect in a high-pressure pump |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0501459A2 (en) * | 1991-02-27 | 1992-09-02 | Nippondenso Co., Ltd. | Common-rail fuel injection system and related method |
DE10036772A1 (en) * | 2000-07-28 | 2002-02-14 | Bosch Gmbh Robert | Operating fuel allocation system of a direct-injection internal combustion engine, involves using value defining conveyance characteristic curve of high-pressure pumps for defect diagnosis |
US6526948B1 (en) * | 1998-03-02 | 2003-03-04 | Cummins, Inc. | Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine |
EP2336533A2 (en) * | 2009-12-19 | 2011-06-22 | DEUTZ Aktiengesellschaft | Method for recognising and determining a defective high pressure pump of a common rail system by means of sensor signals and control device for a combustion engine |
CN102828876A (en) * | 2012-08-27 | 2012-12-19 | 潍柴动力股份有限公司 | Method and device for detecting fault of oil supply imbalance |
US20130275026A1 (en) * | 2012-04-13 | 2013-10-17 | Caterpillar Inc. | Common Rail System Fault Diagnostic Using Digital Resonating Filter |
US20140222312A1 (en) * | 2011-09-09 | 2014-08-07 | Janos Radeczky | Method for Analyzing the Efficiency of the High-Pressure Pump of a Fuel Injection System |
DE102015212428A1 (en) * | 2015-07-02 | 2017-01-05 | Robert Bosch Gmbh | A method of verifying the operability of a pump designed to deliver a fluid |
-
2017
- 2017-12-13 SE SE1751533A patent/SE541906C2/en unknown
-
2018
- 2018-12-05 WO PCT/SE2018/051247 patent/WO2019117785A1/en active Application Filing
- 2018-12-05 DE DE112018005798.4T patent/DE112018005798T5/en active Granted
- 2018-12-05 BR BR112020010884-7A patent/BR112020010884A2/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0501459A2 (en) * | 1991-02-27 | 1992-09-02 | Nippondenso Co., Ltd. | Common-rail fuel injection system and related method |
US6526948B1 (en) * | 1998-03-02 | 2003-03-04 | Cummins, Inc. | Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine |
DE10036772A1 (en) * | 2000-07-28 | 2002-02-14 | Bosch Gmbh Robert | Operating fuel allocation system of a direct-injection internal combustion engine, involves using value defining conveyance characteristic curve of high-pressure pumps for defect diagnosis |
EP2336533A2 (en) * | 2009-12-19 | 2011-06-22 | DEUTZ Aktiengesellschaft | Method for recognising and determining a defective high pressure pump of a common rail system by means of sensor signals and control device for a combustion engine |
US20140222312A1 (en) * | 2011-09-09 | 2014-08-07 | Janos Radeczky | Method for Analyzing the Efficiency of the High-Pressure Pump of a Fuel Injection System |
US20130275026A1 (en) * | 2012-04-13 | 2013-10-17 | Caterpillar Inc. | Common Rail System Fault Diagnostic Using Digital Resonating Filter |
CN102828876A (en) * | 2012-08-27 | 2012-12-19 | 潍柴动力股份有限公司 | Method and device for detecting fault of oil supply imbalance |
DE102015212428A1 (en) * | 2015-07-02 | 2017-01-05 | Robert Bosch Gmbh | A method of verifying the operability of a pump designed to deliver a fluid |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113357032A (en) * | 2021-06-29 | 2021-09-07 | 东风汽车集团股份有限公司 | High-pressure oil pump fault detection post-processing method and electronic equipment |
Also Published As
Publication number | Publication date |
---|---|
DE112018005798T5 (en) | 2020-08-27 |
SE541906C2 (en) | 2020-01-02 |
BR112020010884A2 (en) | 2020-11-10 |
SE1751533A1 (en) | 2019-06-14 |
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