WO2001044638A2 - Verfahren zur verbesserung des startverhaltens einer brennkraftmaschine mit hochdruck-speichereinspritzsystem - Google Patents
Verfahren zur verbesserung des startverhaltens einer brennkraftmaschine mit hochdruck-speichereinspritzsystem Download PDFInfo
- Publication number
- WO2001044638A2 WO2001044638A2 PCT/DE2000/004416 DE0004416W WO0144638A2 WO 2001044638 A2 WO2001044638 A2 WO 2001044638A2 DE 0004416 W DE0004416 W DE 0004416W WO 0144638 A2 WO0144638 A2 WO 0144638A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- internal combustion
- combustion engine
- fuel
- pressure
- bkm
- Prior art date
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
- 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- 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
-
- 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
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
- F02N2200/063—Battery voltage
Definitions
- the invention relates to a method for improving the starting behavior of an internal combustion engine with a high-pressure accumulator injection system according to the preamble of claim 1.
- High-pressure accumulator injection systems are increasingly being used for the fuel supply to internal combustion engines.
- Such injection systems are known as common rail systems (for diesel internal combustion engines) and HPDI injection systems (for gasoline internal combustion engines).
- the fuel is pumped with a high-pressure pump into a common pressure accumulator, from which the injection valves on the individual cylinders are supplied.
- the opening and closing of the injection valves is usually controlled electrically or electromagnetically.
- the fuel is compressed using the high-pressure pump, stored in the high-pressure accumulator called the rail, and injected into the combustion chamber of the engine through the injectors called injectors.
- the rail also serves to smooth out pressure pulsations, which requires a sufficiently large storage volume.
- the start time can be shortened only a little by reasonable compromises between the measures mentioned. In general, therefore, the longer starting time in comparison with other injection systems in internal combustion engines with common-pail injection technology is currently tolerated.
- a fuel injection system with a pre-pump, a high pressure pump, a fuel line and connected in ectors is known.
- a fuel accumulator is also provided, which is connected to the fuel line.
- a valve is provided for spooling the fuel line, with which the fuel line can be connected to a return line to the tank. In a starting phase, the valve is opened and in this way a spooling of the fuel line and also a setting of a low pressure in the fuel line is achieved.
- a bypass line is provided, with which in the start phase, the fuel required by the pre-pump is directed past the high-pressure pump directly into the fuel line.
- a high-pressure fuel storage system for an internal combustion engine in which a fuel storage device is provided and, in addition, an additional fuel storage device can be connected to the fuel storage device via a controllable valve. To quickly increase the fuel pressure in the fuel accumulator, the valve is opened and the high pressure in the additional fuel accumulator is transferred to the fuel accumulator.
- the invention is based on the object of specifying a method with which the starting behavior of an internal combustion engine with a high-pressure accumulator injection system of the type mentioned at the beginning is improved, in particular the time period until pressure build-up in the high-pressure accumulator injection system can be shortened.
- the system-sized battery voltage is evaluated in order to quickly identify the starting process of an internal combustion engine equipped with a high-pressure accumulator injection system.
- the ignition is switched on, the operating voltage of the vehicle equipped with the internal combustion engine is monitored and the occurrence of a voltage drop in the operating voltage caused by energizing a starter of the internal combustion engine is used as the point in time for controlling at least one of the hydraulic actuators, volume flow control valve and pressure control valve.
- Figure 1 is a schematic representation of an injection system for a direct injection internal combustion engine
- Figure 2 is a diagram for selected waveforms
- FIG. 1 schematically shows the structure of a fuel injection system for a direct-injection internal combustion engine BKM, as it is used under the name common rail system, particularly in vehicles with a diesel internal combustion engine. Only those components are shown that are necessary for understanding the invention.
- this injection system fuel is drawn in from a fuel tank 10 via a fuel line 11 by a pre-pump 12.
- the preliminary pump 12 requests the fuel via a fuel filter 13 to a high-pressure pump 14, which compresses the fuel and feeds it under high pressure into a high-pressure accumulator 15, the so-called rail.
- this high-pressure accumulator 15 also has the essential task of smoothing pressure pulsations through a sufficiently large storage volume.
- an additional suction throttle valve hereinafter referred to as the volume flow control valve VCV, is located between the pre-supply pump 12 and the high-pressure pump 14. arranged, with the help of which the flow of high pressure pump 14 can be regulated.
- This volume flow control valve VCV is controlled by a control unit 16 via a control line 17.
- the control unit 16 is preferably integrated into an electronic control unit 18 of the internal combustion engine, all of which are used to operate the internal combustion engine. BKM engine controls and / or regulates the necessary processes.
- control unit 18 of the internal combustion engine BKM is supplied with a large number of input signals ES recorded by means of appropriate sensors.
- the individual actuators and components which are necessary for operating the internal combustion engine BKM are controlled via output signals AS.
- the control unit 16 has a counter 32 and a memory 31, in which, among other things, a threshold value SW is stored, the meaning of which will be explained in more detail later with reference to the description of FIG. 2.
- a pressure control valve PCV is also connected into the fuel line 11 after the high-pressure pump 14.
- This pressure control valve PCV controls and / or regulates excess fuel, which is not required to maintain a desired pressure in the high-pressure accumulator 15, into the fuel reservoir 10 via a fuel return line 19, the holding pressure of the pressure control valve PCV being controlled by the control unit 16 via a Control line 20 is set.
- a pressure sensor 21 is also provided for pressure control in the high-pressure accumulator 15. This pressure sensor 21 is used to detect the pressure currently prevailing in the high-pressure accumulator 15, on the pressure thereof
- control unit 16 carries out the pressure control via the pressure control valve PCV in accordance with the desired operating conditions of the internal combustion engine BKM.
- fuel pressures of 0 to 1500 bar can be generated using the arrangement shown. These fuel pressures are applied via fuel injection lines 22 to injectors, referred to as injectors 23, which are arranged in the combustion chambers of the internal combustion engine BKM. These injectors 23 generally have an injection nozzle which is closed with a spring-loaded needle. The injection process is through the Control unit 16, which is connected to the injectors 23 via control lines 24. The leakage flow occurring in the injectors 23 is returned to the fuel reservoir 10 via fuel return lines 25n shown in broken lines.
- crankshaft sensor 33 is provided on the internal combustion engine BKM, which outputs a signal corresponding to the speed of the crankshaft to the control unit 16 for further processing.
- the preliminary pump 12 is driven by an electric motor 26, which is connected to the control unit 16 via a control line 27. Furthermore, such an electrically driven preliminary pump 12 can also be designed to be adjustable in speed.
- the feed pump 12 and the high pressure pump 14 can also be driven by the internal combustion engine BKM, the rotational speeds of which are then set at a fixed transmission ratio proportional to the rotational speed of the internal combustion engine.
- the pre-pump 12 is preferably integrated in the housing of the high pressure pump 14.
- reference numeral 28 denotes a vehicle battery which emits an on-board voltage VB and whose positive pole is led to a terminal KL30 of a starter switch 29, while the negative pole is connected to the vehicle body.
- the output of the ignition starter switch 29, designated by terminal KL15 is connected to the control unit 16 and the control unit 18 via a line, which is not described in more detail.
- At terminal KL 15 (connected plus after Vehicle battery) is voltage when the ignition is switched on, ie the ignition switch 29 m is the position labeled 1.
- the output of the ignition starter switch 29, designated by terminal 50 is connected to a starter 30 (starter) of the internal combustion engine BKM via a line which is not specifically described.
- the positive pole of the vehicle battery 28 is led to the starter 30.
- the ignition starter switch is moved 29 m to the position marked 2. This initiates the starting process of the BKM internal combustion engine.
- a specific pressure and a specific demand are set in the high-pressure accumulator injection system, depending on the operating point, by correspondingly controlling the hydraulic control elements, volume flow control valve VCV and pressure control valve PCV by means of a so-called closed-loop control.
- the pressure control valve PCV is opened in order to drain the fuel from the high-pressure accumulator.
- the volume flow control valve VCV remains briefly open during the run-on of the control unit 16 in order to fill the pump chamber of the high-pressure pump 14 again. The next time the internal combustion engine BKM is started, this dead space is no longer filled, which leads to the operational readiness of the high-pressure accumulator injection system being faster.
- the pressure control valve PCV is open when de-energized, ie when the internal combustion engine BKM is switched off, it is de-energized.
- the volume flow control valve VCV is closed when de-energized so that after the run-on time has elapsed, the power supply is switched off Fuel supply line 11 to the high pressure pump 14 is interrupted. If the power supply fails, both take
- the hydraulic actuators volume flow control valve VCV and pressure control valve PCV must be activated immediately.
- the pressure control valve PCV is closed and the volume flow control valve VCV is opened, so that fuel can be supplied to the high-pressure pump 14 and compressed by it.
- the prerequisite for this is a quick detection of the starting process of the internal combustion engine BKM in order to control the hydraulic actuators in the specified manner at an early stage.
- the diagram in FIG. 2 shows how the start time of the internal combustion engine BKM can be recognized as early as possible.
- the chronological course of the signals for the pressure control valve PCV and for the volume flow control valve VCV, as well as the course of the battery voltage VB and a signal FLAG from a crankshaft sensor are plotted in the order from bottom to top.
- the system-sized battery voltage VB becomes according to the invention evaluated. At time tl, the ignition key is turned
- the battery voltage VB is present at terminal KL15.
- the battery voltage VB is measured in a fixed time pattern, for example every 10 ms.
- the current measured value at the sampling time n is compared with the temporally preceding measured value at the sampling time t n-1.
- the starting process of the internal combustion engine BKM at time t2 is initiated by turning the ignition key further.
- the battery voltage VB is present at the terminal KL30 and the starter 30 is thus energized. Due to the high current consumption of starter 30, a significantly high drop in battery voltage VB at time t2 can be measured. So a measured value is significant
- the evaluation of successive measured values at times n, nl is advantageously carried out by forming the difference between the two measured values and comparing the difference with a threshold value SW.
- This threshold value SW is determined experimentally on the test stand for a given starter and is stored in a memory 31 of the control unit 16. At the time t2, a payer 32 is started.
- the hydraulic actuators volume flow control valve VCV and pressure control valve PCV are actuated again via corresponding signals for the operation "standstill of the internal combustion engine", since the BKM internal combustion engine obviously did not start in the specified time period. If the control unit 16 detects a rotation of the crankshaft at a speed above the starter speed on the basis of the signal from the crankshaft sensor 33, then the internal combustion engine BKM including the hydraulic actuators is controlled or regulated with signals for normal operation outside of the starting process.
- pre-pump 12 and the high-pressure pump 14 are not driven by the internal combustion engine BKM itself, but by means of separate electric motors, these are also activated immediately after detection of the battery voltage dip at time t2. This enables an even faster pressure build-up in the high-pressure accumulator injection system.
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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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50007937T DE50007937D1 (de) | 1999-12-15 | 2000-12-12 | Verfahren zur verbesserung des startverhaltens einer brennkraftmaschine mit hochdruck-speichereinspritzsystem |
EP00993428A EP1238190B1 (de) | 1999-12-15 | 2000-12-12 | Verfahren zur verbesserung des startverhaltens einer brennkraftmaschine mit hochdruck-speichereinspritzsystem |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19960546.7 | 1999-12-15 | ||
DE19960546 | 1999-12-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001044638A2 true WO2001044638A2 (de) | 2001-06-21 |
WO2001044638A3 WO2001044638A3 (de) | 2001-12-27 |
Family
ID=7932784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/004416 WO2001044638A2 (de) | 1999-12-15 | 2000-12-12 | Verfahren zur verbesserung des startverhaltens einer brennkraftmaschine mit hochdruck-speichereinspritzsystem |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1238190B1 (de) |
DE (1) | DE50007937D1 (de) |
WO (1) | WO2001044638A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009132898A1 (de) * | 2008-04-29 | 2009-11-05 | Continental Automotive Gmbh | Überlagerte druckregelung des common-rail-systems |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10487760B2 (en) * | 2016-04-14 | 2019-11-26 | Ford Global Technologies, Llc | System and methods for reducing particulate matter emissions |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19547877A1 (de) | 1995-12-21 | 1997-06-26 | Bosch Gmbh Robert | Kraftstoffhochdruckspeichersystem für ein in Brennkraftmaschinen eingesetztes Kraftstoffeinspritzsystem |
EP0643219B1 (de) | 1993-09-10 | 1998-01-07 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Brennstoffversorgungssystem für eine Brennkraftmaschine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3133586B2 (ja) * | 1993-11-18 | 2001-02-13 | 富士重工業株式会社 | 高圧燃料噴射式エンジンの燃料圧力制御装置 |
DE4425986B4 (de) * | 1994-07-22 | 2004-04-08 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
JP3815512B2 (ja) * | 1996-08-23 | 2006-08-30 | 株式会社デンソー | エンジン用蓄圧式燃料供給装置の制御方法 |
JP3612175B2 (ja) * | 1997-07-15 | 2005-01-19 | 株式会社日立製作所 | 筒内噴射エンジンの燃料圧力制御装置 |
-
2000
- 2000-12-12 EP EP00993428A patent/EP1238190B1/de not_active Expired - Lifetime
- 2000-12-12 DE DE50007937T patent/DE50007937D1/de not_active Expired - Lifetime
- 2000-12-12 WO PCT/DE2000/004416 patent/WO2001044638A2/de active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0643219B1 (de) | 1993-09-10 | 1998-01-07 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Brennstoffversorgungssystem für eine Brennkraftmaschine |
DE19547877A1 (de) | 1995-12-21 | 1997-06-26 | Bosch Gmbh Robert | Kraftstoffhochdruckspeichersystem für ein in Brennkraftmaschinen eingesetztes Kraftstoffeinspritzsystem |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009132898A1 (de) * | 2008-04-29 | 2009-11-05 | Continental Automotive Gmbh | Überlagerte druckregelung des common-rail-systems |
CN102016278A (zh) * | 2008-04-29 | 2011-04-13 | 欧陆汽车有限责任公司 | 共轨系统的叠加的压力调节 |
US8528522B2 (en) | 2008-04-29 | 2013-09-10 | Continental Automotive Gmbh | Superimposed pressure control of the common rail system |
Also Published As
Publication number | Publication date |
---|---|
DE50007937D1 (de) | 2004-10-28 |
WO2001044638A3 (de) | 2001-12-27 |
EP1238190A2 (de) | 2002-09-11 |
EP1238190B1 (de) | 2004-09-22 |
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