EP1218629A1 - Method for measuring the fuel pressure in an injection train of an internal combustion engine - Google Patents
Method for measuring the fuel pressure in an injection train of an internal combustion engineInfo
- Publication number
- EP1218629A1 EP1218629A1 EP00967963A EP00967963A EP1218629A1 EP 1218629 A1 EP1218629 A1 EP 1218629A1 EP 00967963 A EP00967963 A EP 00967963A EP 00967963 A EP00967963 A EP 00967963A EP 1218629 A1 EP1218629 A1 EP 1218629A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- opening
- opening time
- injector
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 66
- 238000002347 injection Methods 0.000 title claims abstract description 12
- 239000007924 injection Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 21
- 238000002485 combustion reaction Methods 0.000 title claims description 10
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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
- F02D41/38—Controlling fuel injection of the high pressure type
-
- 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
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/04—Fuel pressure pulsation in common rails
Definitions
- the present invention is "relating to a method of measuring the fuel pressure prevailing in an electromagnetic mjector of this fuel in one of the cylinders of an internal combustion engine with direct injection, the mjectors associated with said cylinders being supplied with fuel by a common supply rail and their opening time calculated and controlled by a computer.
- a fuel supply device for an internal combustion engine with direct injection of a known type comprising a tank 1 ⁇ e fuel, a pump 2 supplied by the tank 1 and associated to a pressure regulator 3 for delivering fuel to a second pump 5, through a filter 4, the fuel delivered by the pump 2 being brought to a first pressure level higher than atmospheric pressure, but relatively low, whence the name of "low pressure pump” given to pump 2.
- the second pump 5 still raises the fuel pressure to a second level higher than the first, suitable for supplying fuel injectors 6 ⁇ , 6 2 , 6 3 , 6 4 mounted on a ramp 7 for supplying fuel to the cylinders of an internal combustion engine with direct injection (not shown).
- the pressure of the fuel delivered by the pump 5, called “high pressure pump”, is fixed by an electromechanical regulator 8, such as a solenoid valve controlled by a computer 9.
- a sensor 10 delivers to the computer 9 a signal representative of the pressure of the fuel contained in the ramp 7, to allow the computer to regulate the fuel pressure in this rail at the required predetermined level.
- the computer 9 is commonly constituted by the engine operation management computer, controlling inter alia the 6 ⁇ mjectors (1 from 1 to 4 in the example shown), and in particular the opening time of these.
- the fuel not delivered by the mjectors 6 is returned to the tank through a pipe 11, 12 placed at atmospheric pressure.
- the quantity of fuel which must be injected by a particular injector into the associated cylinder of the engine is calculated by the computer 9 according to a certain number of well-known parameters.
- the computer also determines the opening time of the injector which is capable of ensuring the entry into the cylinder of a predetermined quantity of fuel. This opening time is a function of this quantity but also of the fuel pressure prevailing in the ramp 7, a pressure which fluctuates over time despite the presence of the regulator 8.
- it can be constituted by a solenoid valve controlled by the computer 9, to establish a discontinuous fuel leak, capable of ensuring the regulation of the fuel pressure at a predetermined level.
- FIG. 2 there is shown in 6 X the timing diagram of the opening of the ⁇ injector considered, for a time T x , and in P, the graph of the fuel pressure P in the rail, observed during and around the opening of this mjector.
- the opening of an electromagnetic mjector requires a high intensity electric current generating strong electromagnetic disturbances capable of distorting the measurement signal emitted by the pressure sensor 10 during this opening.
- the present invention aims to provide a method for accurately measuring the fuel pressure prevailing in an injector of this fuel in an internal combustion engine with direct injection, this method does not have the drawbacks of the known methods of prior art discussed above.
- the present invention aims to provide such a method which allows the use of a pressure measurement at current sampling frequency, while being insensitive to electromagnetic disturbances prevailing in the environment of the pressure sensor used.
- this method makes it possible, from a reliable pressure measurement, since it is not disturbed, to know with precision the average pressure prevailing in a fuel injector when the latter delivers fuel. It is then possible to precisely regulate the opening time of the injector, suitable for causing it to charge a quantity of fuel determined by the computer.
- step d) above we subtract from the measurement taken a decrease depending on the pressure measured and / or an estimate of the opening time of the injector .
- an increment according to the calculated opening time is added to the opening time calculated on the basis of the pressure recorded. and the fuel pressure read.
- FIG. 1 is a diagram of a device for supplying fuel to an engine internal combustion engine with direct injection, described as a preamble to this description and suitable for implementing the method according to the invention, and
- the invention will be described in its application to the control of an internal combustion engine with direct injection counting four cylinders supplied respectively by the injectors 6 ⁇ , 6, 6 3 and 6 4 .
- the first situation is illustrated in FIG. 2, already partially described in the preamble to this description, and is encountered in particular when the engine speed is low or medium and the engine load is low or moderate.
- the injection time T x is then short and the fuel pressure, which varies downwards when the injector opens, cannot be restored before it is closed under the action of the regulator 8.
- the sensor 10 delivers to the computer (9) an electrical signal containing a measurement of the fuel pressure in the rail 7.
- the computer eliminates from its calculations the pressure measurement samples taken during the opening time T x of the injector.
- the samples taken are likewise eliminated immediately after closing the injector, for an additional time interval ⁇ t suitable for allowing the sensor 10 to again deliver undisturbed and restabilized pressure samples.
- the pressure to be taken into account is then calculated by the computer 9 from a pressure sample acquired, for example, prior to the time to open the injector, and corrected by decrementing suitably the value thus acquired to take account of the fact that, during the opening time T x of the injector, the average pressure or fuel is lowered compared to the pressure measured prior to the opening of the injector.
- the amplitude of the decrement to be applied to the measurement can be evaluated by bench measurements. It is a function, in particular, of the level of the pressure P measured before opening, and / or of an estimate of the opening time of the injector, an estimate obtained for example by calculating a basic opening time at the set pressure applied to regulator 8.
- FIG. 3 represents the opening timing diagrams of these mjectors and l 'consecutive evolution of the fuel pressure P in the rail 7.
- the computer 9 easily detects an opening situation overlapping by at least two mjectors, by comparing the duration between two successive top dead centers (TDC), known by the engine speed, to the opening time of the corresponding injector .
- TDC top dead centers
- the computer 9 diagnoses a recovery of the opening times of at least two of the mj ectors. It is then no longer possible to exclude the fuel pressure samples emitted during the opening times of the injectors.
- the computer 9 requires for the measurement of the fuel pressure in an injector, a sampling of this synchronous measurement at the opening of said injector, whether this opening occurs alone or during the opening time another injector, and corrects the selected sample by decrementing it to take account of the average drop in fuel pressure that results from the opening of the injector considered.
- the computer 9 can suitably adjust the opening time T ⁇ of each mjector by controlling the instant of its closing.
- the computer 7 can directly calculate this opening time in adding, to an opening time T x calculated on the basis of the pressure measured, an increment ⁇ T X as a function of the calculated opening time and the pressure recorded, this increment compensating for the drop in pressure observed in the injector at the following the opening of it.
Landscapes
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9912573A FR2799544B1 (en) | 1999-10-08 | 1999-10-08 | METHOD FOR MEASURING THE FUEL PRESSURE OF AN ELECTROMAGNETIC FUEL INJECTOR IN ONE OF THE CYLINDERS OF A DIRECT INJECTION INTERNAL COMBUSTION ENGINE |
FR9912573 | 1999-10-08 | ||
PCT/FR2000/002778 WO2001027454A1 (en) | 1999-10-08 | 2000-10-06 | Method for measuring the fuel pressure in an injection train of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218629A1 true EP1218629A1 (en) | 2002-07-03 |
EP1218629B1 EP1218629B1 (en) | 2004-12-08 |
Family
ID=9550716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00967963A Expired - Lifetime EP1218629B1 (en) | 1999-10-08 | 2000-10-06 | Method for measuring the fuel pressure in an injection train of an internal combustion engine |
Country Status (8)
Country | Link |
---|---|
US (1) | US6705295B1 (en) |
EP (1) | EP1218629B1 (en) |
JP (1) | JP4471550B2 (en) |
KR (1) | KR100733800B1 (en) |
DE (1) | DE60016612T2 (en) |
ES (1) | ES2228615T3 (en) |
FR (1) | FR2799544B1 (en) |
WO (1) | WO2001027454A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6964261B2 (en) * | 2003-12-11 | 2005-11-15 | Perkins Engines Company Limited | Adaptive fuel injector trimming during a zero fuel condition |
US7370521B1 (en) * | 2006-10-25 | 2008-05-13 | Gm Global Technology Operations, Inc. | Method to detect a contaminated fuel injector |
US8118006B2 (en) * | 2010-04-08 | 2012-02-21 | Ford Global Technologies, Llc | Fuel injector diagnostic for dual fuel engine |
US8402928B2 (en) * | 2010-04-08 | 2013-03-26 | Ford Global Technologies, Llc | Method for operating an engine with variable charge density |
US8001934B2 (en) * | 2010-04-08 | 2011-08-23 | Ford Global Technologies, Llc | Pump control for reformate fuel storage tank |
US8191514B2 (en) | 2010-04-08 | 2012-06-05 | Ford Global Technologies, Llc | Ignition control for reformate engine |
US8015952B2 (en) | 2010-04-08 | 2011-09-13 | Ford Global Technologies, Llc | Engine fuel reformer monitoring |
US8245671B2 (en) * | 2010-04-08 | 2012-08-21 | Ford Global Technologies, Llc | Operating an engine with reformate |
US8041500B2 (en) | 2010-04-08 | 2011-10-18 | Ford Global Technologies, Llc | Reformate control via accelerometer |
US8230826B2 (en) | 2010-04-08 | 2012-07-31 | Ford Global Technologies, Llc | Selectively storing reformate |
US8037850B2 (en) | 2010-04-08 | 2011-10-18 | Ford Global Technologies, Llc | Method for operating an engine |
US8539914B2 (en) * | 2010-04-08 | 2013-09-24 | Ford Global Technologies, Llc | Method for operating an engine with a fuel reformer |
US8146541B2 (en) | 2010-04-08 | 2012-04-03 | Ford Global Technologies, Llc | Method for improving transient engine operation |
US8613263B2 (en) * | 2010-04-08 | 2013-12-24 | Ford Global Technologies, Llc | Method for operating a charge diluted engine |
US8307790B2 (en) | 2010-04-08 | 2012-11-13 | Ford Global Technologies, Llc | Method for operating a vehicle with a fuel reformer |
JP5519410B2 (en) * | 2010-06-01 | 2014-06-11 | 本田技研工業株式会社 | Fuel supply device for internal combustion engine |
US10094320B2 (en) * | 2015-06-23 | 2018-10-09 | Ford Global Technologies, Llc | Methods and systems for dual fuel injection |
DE102015217645A1 (en) * | 2015-09-15 | 2017-03-16 | Robert Bosch Gmbh | Method for operating an injection system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2715440B1 (en) * | 1994-01-24 | 1996-02-23 | Siemens Automotive Sa | Method for controlling the quantity of fuel injected into an internal combustion engine. |
DE19718171C2 (en) * | 1997-04-29 | 2001-11-15 | Siemens Ag | Method for determining the injection time for a direct injection internal combustion engine |
DE19726756C2 (en) | 1997-06-24 | 2002-03-07 | Bosch Gmbh Robert | System for operating an internal combustion engine, in particular a motor vehicle |
DE19735561B4 (en) * | 1997-08-16 | 2007-12-20 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine |
EP1064457B1 (en) * | 1998-03-16 | 2002-06-12 | Siemens Aktiengesellschaft | Method for determining the injection time in a direct injection internal combustion engine |
JP4627603B2 (en) * | 2001-03-15 | 2011-02-09 | 日立オートモティブシステムズ株式会社 | Fuel supply device |
-
1999
- 1999-10-08 FR FR9912573A patent/FR2799544B1/en not_active Expired - Fee Related
-
2000
- 2000-10-06 KR KR1020027004509A patent/KR100733800B1/en not_active IP Right Cessation
- 2000-10-06 EP EP00967963A patent/EP1218629B1/en not_active Expired - Lifetime
- 2000-10-06 ES ES00967963T patent/ES2228615T3/en not_active Expired - Lifetime
- 2000-10-06 JP JP2001529568A patent/JP4471550B2/en not_active Expired - Fee Related
- 2000-10-06 WO PCT/FR2000/002778 patent/WO2001027454A1/en active IP Right Grant
- 2000-10-06 US US10/110,110 patent/US6705295B1/en not_active Expired - Fee Related
- 2000-10-06 DE DE60016612T patent/DE60016612T2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0127454A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60016612T2 (en) | 2005-05-25 |
WO2001027454A1 (en) | 2001-04-19 |
US6705295B1 (en) | 2004-03-16 |
KR20020081204A (en) | 2002-10-26 |
JP4471550B2 (en) | 2010-06-02 |
FR2799544B1 (en) | 2002-01-04 |
FR2799544A1 (en) | 2001-04-13 |
KR100733800B1 (en) | 2007-07-02 |
EP1218629B1 (en) | 2004-12-08 |
ES2228615T3 (en) | 2005-04-16 |
DE60016612D1 (en) | 2005-01-13 |
JP2003511620A (en) | 2003-03-25 |
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