EP0916080A1 - Internal combustion engine misfire detection method - Google Patents
Internal combustion engine misfire detection methodInfo
- Publication number
- EP0916080A1 EP0916080A1 EP97936729A EP97936729A EP0916080A1 EP 0916080 A1 EP0916080 A1 EP 0916080A1 EP 97936729 A EP97936729 A EP 97936729A EP 97936729 A EP97936729 A EP 97936729A EP 0916080 A1 EP0916080 A1 EP 0916080A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion
- misfire
- detecting
- threshold
- engine
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 description 16
- 239000000446 fuel Substances 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- 230000015654 memory Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/11—Testing internal-combustion engines by detecting misfire
Definitions
- the present invention relates to a method for detecting misfires of an internal combustion engine fitted to a motor vehicle.
- the American and European standards provide for imposing the detection of misfire and identifying the responsible cylinder (s). Such detection should, for example, provide the percentage of misfires occurring in a given number of engine cycles. Equipment manufacturers and car manufacturers have therefore developed a number of techniques for detecting misfire.
- the accelerometer method which consists in detecting a misfire by analysis of the variation in longitudinal acceleration of the vehicle, or the method using a proportional oxygen sensor placed in the exhaust line.
- the method using pressure sensors opening into the combustion chambers or that based on the measurement of the arc voltage or the ionization current of the spark plugs (for spark ignition engines ).
- the instantaneous speed of rotation of the crankshaft and the flywheel which is integral with it does not only reflect the operation of the engine and the alternating thrust of the connecting rods under the effect of the combustion of the fuel mixture, but also the operation of the assembly. of the kinematic chain linking the engine to the tire / ground interface.
- the mechanical energy at the end of the crankshaft is transmitted to the wheels by a transmission system traditionally comprising a clutch, a gearbox and a differential, this transmission system having its own damping and rigidity.
- a transmission system traditionally comprising a clutch, a gearbox and a differential, this transmission system having its own damping and rigidity.
- the object of the present invention is therefore to produce a method for detecting misfires which overcomes the aforementioned drawbacks.
- the method for detecting a misfire relates more particularly to multi-cylinder internal combustion engines for motor or road vehicles. This process is carried out by analysis of the values of a quantity representative of the gas couple of the quality of the combustion deduced from the rotation of the crankshaft, to detect the occurrence of a misfire.
- the method of detecting a misfire is characterized in that the detection of misfire is suspended for a predetermined period, when the analysis of these values characteristic of the quality of the combustion reveals anomalies arising of the transmission kinematic chain connecting the drive shaft to the vehicle wheels, this detection of misfires being suspended when the characteristic values of the combustion considered become greater than a given threshold value known as the high threshold.
- the originality of the invention is to deduce directly from the signal used to identify misfires, the occurrence of disturbances in the transmission likely to falsify the identification of misfires.
- the principle of the strategy object of the invention is based on the fact that unlike misfires which can only cause a drop in the observed signal, disturbances from the kinematic chain of transmission of movement from the engine to the wheels cause as well falls as increases in the level of the signal observed and this generally alternately.
- this procedure comprises the following operations executed after each combustion:
- the high threshold is a function of the characteristic value of the combustion considered. According to another characteristic of the method for detecting a misfire of the invention, the high threshold is a function of the low threshold.
- the high threshold is a function of the characteristic value of the combustion considered and of the low threshold, after appropriate statistical processing of the latter.
- the high threshold is predefined according to the operating conditions of the engine.
- the predetermined period during which are no longer taken into account any detection of misfire is constant.
- the predetermined period during which are no longer taken into account any detection of misfire is predefined according to the operating conditions of the engine.
- the predetermined period during which any misfire detection is no longer taken into account retroactively includes a given number of previous combustions.
- FIG. 1 is a partial view of an internal combustion engine equipped with an engine control system for implementing the method according to one invention
- FIG. 2 is a timing diagram detailing the principle of the misfire detection method object of the invention.
- FIG. 3 is a block diagram specifying the progress of the method for detecting misfires that are the subject of the invention.
- the internal combustion engine which is referenced 1, is more particularly intended to equip a motor or road vehicle.
- the motor 1 is connected to a transmission device suitable for transmitting the movement to the wheels of the vehicle.
- This transmission device conventionally comprises a clutch, a gearbox 2 and a differential not shown.
- the multi-cylinder engine 1 of the four-stroke type is equipped with an electronically controlled ultipoint type fuel injection device by which each cylinder is supplied with fuel from a specific electro-injector 5.
- each electro-injector 5 is controlled by the electronic engine control system 7, which adjusts the quantity of fuel injected and the injection time in the cycle according to the operating conditions of the engine, so as to precisely control the richness of the fuel air-fuel mixture admitted into the cylinders at a predetermined set value.
- microprocessor 70 conventionally comprises a microprocessor 70, random access memories 71, read-only memories 72, analog-digital converters 74 as well as various input and output interfaces.
- the microprocessor 70 includes electronic circuits and appropriate software to process the signals coming from sensors adapted, determine the states of the engine and implement predefined operations in order to generate control signals intended in particular for injectors (and ignition coils in the case of a spark-ignition engine) so as to best manage combustion conditions in the engine cylinders.
- the input signals of the microprocessor 70 include in particular those sent by a crankshaft sensor 4.
- This sensor 4 of the type with variable reluctance for example, is mounted fixed on the engine frame to be positioned in front of a measuring crown 12 fixed to one end of the crankshaft.
- This crown 12 is provided at its periphery with a succession of identical teeth and hollows with the exception of a tooth which has been removed so as to define an absolute reference point making it possible to deduce the instant of passage at Top Dead Center d 'a given cylinder of reference, in this case cylinder n ° l.
- the sensor 4 delivers a signal Dn corresponding to the scrolling of the teeth of the crown 12, signal which after processing makes it possible to generate a TDC signal at each half-turn of the crankshaft allowing the locating of the passages in top dead center alternately of the cylinders n ° l, 3, 4, 2.
- the processing of the signal Dn emitted by the sensor 4 also makes it possible to measure the speed of travel of the teeth of the crown 12, and thus obtain the instantaneous engine rotation speed.
- the method of detecting misfires object of the invention proceeds by analysis of a quantity characteristic of the quality of the combustions occurring in each of the engine cylinders. This quantity is more precisely the gas torque, the calculation of a representative value obtained by spectral analysis of the instantaneous speed of the crankshaft is notably disclosed in French patent applications No. 91/11273 and 91/11274 filed by the Applicant relating to a "method and device for measuring the gas torque of an internal combustion engine".
- suitable calculation means activated by the microprocessor 70 therefore supply the successive torque values, referenced Cg, n, i to characterize the gas torque value Cg corresponding to the n-th combustion of cylinder n ° i of the operating period considered.
- the graph in Figure 2 illustrates the principle of the invention.
- zone 1 of the graph the values of the gas torque Cg, n, i for a given cylinder i then change slightly and else of a nominal value MCg, i.
- MCg nominal value
- the low threshold B i is for example mapped according to the operating conditions of the engine and stored in the memories of the engine control system 7.
- the detection of disturbances is carried out in a simple manner by introducing a threshold value called the high threshold H, i.
- the detection of misfires is then suspended when the gas torque values become above the high threshold.
- This suspension is operated for a predetermined period.
- the beginning of this period can start at the instant of combustion corresponding to the exceeding of the high threshold or even go back retroactively to a given number of previous engine cycles.
- the torque increases by the transmission device can be added or subtract from the nominal torque of the cylinder considered, the probability of not detecting the start of the disturbance by the high threshold is therefore 50%. In the case of a retroactive suspension period, therefore, all the misfires detected before the high threshold were exceeded and which occurred in the period considered.
- a method according to the invention therefore consists of the following steps executed after each of the combustions indexed n and for a given cylinder n ° i:
- H, i f (Cg, n, i) + (f (Cg, n, i) - B, i) x ⁇ (iv) - comparison of the torque value Cg, n, i at the high threshold H, i ;
- the high threshold is
- ⁇ is a value (for example 0.6) which can be constant or even varialbe of the engine speed, engine load and / or of the gear ratio engaged (f (Cg, n, i) - B, i) can be replaced by the torque drop expected at the operating point considered and invariant for all the cylinders.
- the high and low thresholds can be obtained according to all kinds of strategies: maps taking into account the different engine operating points, constant percentages of nominal gas torque, etc.
- the device for detecting misfires whatever the variant chosen, it can be produced in various forms:
- microprogrammable chip or not, encapsulated separately or else all or part of a coprocessor implanted in a microcontroller or microprocessor etc.
- the invention includes all the technical equivalents applied to an internal combustion engine whatever its combustion cycle (2 stroke, 4 stroke), the fuel used diesel or petrol or the number of its cylinders.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9609780 | 1996-08-02 | ||
FR9609780A FR2752018B1 (en) | 1996-08-02 | 1996-08-02 | METHOD FOR DETECTING COMBUSTION RATES OF AN INTERNAL COMBUSTION ENGINE |
PCT/FR1997/001441 WO1998005936A1 (en) | 1996-08-02 | 1997-08-01 | Internal combustion engine misfire detection method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0916080A1 true EP0916080A1 (en) | 1999-05-19 |
Family
ID=9494771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97936729A Withdrawn EP0916080A1 (en) | 1996-08-02 | 1997-08-01 | Internal combustion engine misfire detection method |
Country Status (4)
Country | Link |
---|---|
US (1) | US6334357B2 (en) |
EP (1) | EP0916080A1 (en) |
FR (1) | FR2752018B1 (en) |
WO (1) | WO1998005936A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10039965A1 (en) * | 2000-08-16 | 2002-02-28 | Siemens Ag | Method and arrangement for exhaust gas analysis on motor vehicles with on-board engine control and diagnostic system |
FR2844301B1 (en) | 2002-09-05 | 2004-11-26 | Renault Sa | METHOD FOR DETECTING COMBUSTION FAULTS OF AN INTERNAL COMBUSTION ENGINE |
US20040215379A1 (en) * | 2003-04-22 | 2004-10-28 | Vericom Compters Inc. | Vehicle performance analyzer |
US7006912B2 (en) * | 2003-05-29 | 2006-02-28 | Cummins Inc. | Cylinder misfire diagnostic system |
FR2891012B1 (en) * | 2005-09-20 | 2011-02-11 | Inst Francais Du Petrole | METHOD OF ESTIMATING THE INSTANTANEOUS REGIME PRODUCED BY EACH OF THE CYLINDERS OF AN INTERNAL COMBUSTION ENGINE |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044195A (en) * | 1990-08-24 | 1991-09-03 | Ford Motor Company | Misfire detection in an internal combustion engine |
US5869752A (en) * | 1990-12-10 | 1999-02-09 | Sensortech L.L.C. | Engine degradation detector |
US5269178A (en) * | 1990-12-10 | 1993-12-14 | Sensortech, L.P. | Engine misfire, knock of roughness detection method and apparatus |
US5440921A (en) * | 1991-10-16 | 1995-08-15 | Nissan Motor Co., Ltd. | Device for detecting misfire of internal combustion engine |
JPH05312085A (en) * | 1992-05-07 | 1993-11-22 | Nippondenso Co Ltd | Rough detector |
DE4215938C2 (en) * | 1992-05-14 | 2002-10-31 | Bosch Gmbh Robert | Misfire detection system in an internal combustion engine |
US5587909A (en) * | 1992-06-16 | 1996-12-24 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Misfire detecting method |
US5447061A (en) * | 1992-10-08 | 1995-09-05 | Fuji Jukogyo Kabushiki Kaisha | Misfire detection method for engine |
EP0622542B1 (en) * | 1993-04-27 | 1996-08-28 | Siemens Aktiengesellschaft | Misfire detection with rough road detection |
DE4316409A1 (en) * | 1993-05-17 | 1994-11-24 | Bosch Gmbh Robert | Method and device for detecting misfires |
IT1260957B (en) * | 1993-08-04 | 1996-04-29 | Fiat Ricerche | PROCEDURE AND SYSTEM FOR DETECTION OF FAILURE IN COMBUSTION IN INTERNAL COMBUSTION ENGINES. |
JP3381179B2 (en) * | 1993-10-05 | 2003-02-24 | 株式会社日立製作所 | Vehicle state detection device and detection method |
JP3203463B2 (en) * | 1994-04-11 | 2001-08-27 | 株式会社ユニシアジェックス | Apparatus for detecting rough road running of vehicle and apparatus for detecting misfire of vehicle engine |
DE59408120D1 (en) * | 1994-11-08 | 1999-05-20 | Siemens Ag | Method for the detection of crankshaft oscillations |
US5841025A (en) * | 1995-03-31 | 1998-11-24 | Motorola Inc. | Misfire detection method and apparatus |
-
1996
- 1996-08-02 FR FR9609780A patent/FR2752018B1/en not_active Expired - Fee Related
-
1997
- 1997-08-01 WO PCT/FR1997/001441 patent/WO1998005936A1/en active Application Filing
- 1997-08-01 US US09/147,614 patent/US6334357B2/en not_active Expired - Fee Related
- 1997-08-01 EP EP97936729A patent/EP0916080A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9805936A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20010037792A1 (en) | 2001-11-08 |
FR2752018A1 (en) | 1998-02-06 |
US6334357B2 (en) | 2002-01-01 |
WO1998005936A1 (en) | 1998-02-12 |
FR2752018B1 (en) | 1998-09-04 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19990108 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES GB IT SE |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AUTOMOTIVE S.A. Owner name: RENAULT S.A.S. |
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17Q | First examination report despatched |
Effective date: 20050307 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: G01M 15/11 20060101AFI20111014BHEP |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20120605 |