EP3420213A1 - Method for controlling the combustion of a combustion engine by way of an immediate load reduction method - Google Patents
Method for controlling the combustion of a combustion engine by way of an immediate load reduction methodInfo
- Publication number
- EP3420213A1 EP3420213A1 EP17706569.5A EP17706569A EP3420213A1 EP 3420213 A1 EP3420213 A1 EP 3420213A1 EP 17706569 A EP17706569 A EP 17706569A EP 3420213 A1 EP3420213 A1 EP 3420213A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- lim
- chc
- minimum
- rumble
- 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
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 35
- 230000009467 reduction Effects 0.000 title claims description 10
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 13
- 102100022442 Calmin Human genes 0.000 claims description 4
- 101710185175 Calmin Proteins 0.000 claims description 4
- NPPQSCRMBWNHMW-UHFFFAOYSA-N Meprobamate Chemical compound NC(=O)OCC(C)(CCC)COC(N)=O NPPQSCRMBWNHMW-UHFFFAOYSA-N 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 238000013519 translation Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 description 23
- 230000000670 limiting effect Effects 0.000 description 13
- 239000000446 fuel Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000036461 convulsion Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009109 curative therapy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035807 sensation Effects 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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
- F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2409—Addressing techniques specially adapted therefor
-
- 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
- F02D2250/18—Control of the engine output torque
- F02D2250/26—Control of the engine output torque by applying a torque limit
Definitions
- the present invention relates to a combustion control method of a heat engine by a method of immediate load drop.
- the invention finds a particularly advantageous, but not exclusive, application in the field of motor vehicles equipped with a gasoline type heat engine.
- vibrations are transmitted from the combustion chamber to the rods and the crankshaft (unlike the rattling whose vibration in 5000 Hz and 15000 Hz is felt only in the chamber combustion).
- the "rumble” is caused by an increase in pressure in the combustion chamber, as well as too early ignition or multiple hot spots in the combustion chamber.
- a curative treatment method exists for the purpose of eliminating the phenomenon of "rumble” when it appears.
- This method consists in detecting abnormal combustions via an accelerometer placed on the engine block, then cutting the injection on the cylinders concerned to remove the "rumble".
- the method applies a load limitation on a driving cycle over the entire engine field.
- the load limitation on a driving cycle performed during a series of one or more successive rolls without resetting the engine computer (or “driving-cycle” in English), is a load limitation of which the objective is the disappearance of the phenomenon of "rumble” origin of reversible causes, for example in the case of fouling of the combustion chamber, and / or irreversible, for example during a break engine part.
- the load limitation is based on a "rumble” shot counter with slow dynamics (several minutes or even several rolls) and this load limit is calculated by a map calibrated according to a number of injection cuts made.
- the load limitation achieved on a driving cycle has several disadvantages.
- its action is not immediate since it is based on a counter of "rumble" shots with slow dynamics.
- the level of load limitation is a function of the number of injection cuts, which is not always representative of the number of "rumble” strokes suffered. This level of limitation is therefore not adapted to the just necessary.
- these load restrictions have a reduced efficiency insofar as the first curative action (the injection cut) is effective to remove the "rumble", although that posing a problem of feeling for the driver (jerks, noise).
- the invention aims to effectively overcome these disadvantages by providing a combustion control method of a heat engine, characterized in that the method comprises:
- shots a step of detecting abnormal combustions generating vibrations in a cylinder called "shots", the vibrations having a frequency of between 600 Hz and 1200 Hz,
- the invention thus allows a rapid elimination of abnormal combustion in the engine without damaging the driving pleasure, insofar as the invention is implemented from the first shots of "rumble” and applies a level of load limitation corresponding to just necessary to remove the phenomenon of "rumble” without requiring injection cuts.
- the invention has the advantage of being inexpensive, since it can be integrated by software development in the engine computer without adding additional component.
- the step of calculating the load limitation is carried out when a first shot appears
- the step of applying the load limitation is performed after N hits detected as a function of a translation of the iso-probability curve at a point regime / load corresponding to the first detected shot.
- the step of calculating the load limitation comprises:
- the step of calculating the achievable minimum load drop requires the load limit to be less than a load made during a request for application of the load limit.
- the step of calculating the maximum achievable reduction in load consists in determining a maximum variation in load drop that can not be exceeded during a request to apply the load limit for reasons for approval.
- the step of calculating the minimum allowable load is to introduce a torque threshold below which it is not possible to go down. This is to avoid operating the heat engine in an insufficient load area, for example, to ensure a takeoff of the vehicle.
- the arbitration step for determining the load limitation is carried out according to the following formula:
- Lim_ChC MAX (S_min; MIN (Del_max; MAX (Del_min; C2)))
- C2 is the load limitation based on the first shot
- S_min is the minimum allowable load threshold.
- MIN is the function that selects the minimum of two values
- MAX is the function that selects the maximum from two values.
- the invention also relates to an engine computer having a memory storing software instructions for the implementation of the combustion control method of a heat engine as previously defined.
- the invention also relates to a heat engine comprising such a motor calculator.
- the invention also relates to a vehicle equipped with such a motor.
- FIG. 1 is a functional diagrammatic representation of a system according to the present invention implementing different types of actions to remedy abnormal "rumble" type combustion;
- FIG. 2 is a schematic representation of the steps of the control method according to the present invention making it possible to obtain an immediate load drop of the heat engine following the detection of "rumble"shots;
- Figure 3 is a schematic representation of an improved implementation of the immediate load limiting method of the heat engine according to the present invention;
- FIG. 4 represents curves in a speed / load plane illustrating a basic implementation of the immediate load limiting method according to the present invention
- Figures 5 to 8 show curves in a plan / load plan illustrating life situations in which the basic implementation of the immediate load limiting method according to the invention has drawbacks;
- Figures 9 to 16 show curves in a plan / load plane illustrating life situations in which the improved implementation of the load limiting method according to the present invention overcomes the disadvantages of Figures 5 to 8.
- FIG. 1 is a functional illustration of a system 10 implementing a thermal engine combustion control method that can equip a vehicle, this method making it possible to treat a so-called "rumble” phenomenon in which the air / fuel mixture is used. ignites at a different location from that initiated by the spark plug ordered. The mixture may ignite before the spark at the candle or after the candle spark (it is called “rumble” late). The "rumble” generates vibrations, called “rumble” 101 in the following description, associated with a thud in the combustion chamber constituting an inconvenience for the driver, with a high risk of engine failure. These vibrations have a frequency between 600 and 1200 Hz. These vibrations are transmitted from the combustion chamber to the rods and the crankshaft (unlike the rattling whose vibration in 5000Hz and 15000Hz is felt only in the combustion chamber) .
- the phenomenon of "rumble” generally appears in a zone of engine speed of between 1000 and 3000 rev / min and with high air filling, for example following the actuation of a turbocharger.
- the rumble 101 is detected by means of a sensor 100 mounted on the engine block. This sensor 100 is also used to detect engine rattling.
- a preventive action 104 consisting of avoiding the appearance of "rumble” and actions 102, 103 of the curative type to treat the "rumble" following his appearance.
- the preventive action 104 consists in particular in limiting the load Lim ChE motor according to a level of fouling of the combustion chamber.
- curative type 102, 103 there is a set of curative actions 102, so-called immediate, and a set of curative actions 103 performed on a corresponding driving cycle ("driving-cycle" in English). to a series of one or more successive rollings without reinitialization of a motor ECU.
- immediate curative actions 102 the time scales, in particular the duration of monitoring before activation of the curative action 102, are very short, of the order of a few Top Dead Center (or TDC) or even a few seconds.
- the curative actions 103 carried out on a driving cycle the time scales, in particular the duration of monitoring before activation of the curative action 103, are longer than for the immediate curative actions 102, of the order of several minutes.
- the curative actions 102, 103 may consist of a load limitation to bring the engine back to an operating point unfavorable filling the "rumble" (a few filling points at full atmospheric load).
- the feeling for the driver varies from a feeling almost zero to a notable loss of performance.
- the load limitation Lim ChR is applied temporarily when the causes of the "rumble” are reversible, for example in case of fouling of the combustion chamber, or permanently Lim Chl when the causes of the "rumble” are irreversible, for example when the engine part breaks.
- a Lim ChC current load limitation having a fast effect is set with a limitation level exactly as necessary to eliminate the "rumble".
- the load drop Lim ChC is determined from the use of iso-probability curve of appearance of the "rumble”.
- Activating a specific fuel enrichment R_Spe can cool the air / fuel mixture. Indeed, according to a new enrichment instruction, fuel is added to the air / fuel mixture so as to cool the mixture. This has the effect of improving the thermal conditions in the combustion chamber to reduce the risk of occurrence of "rumble". This action R_Spe, quick to implement, has no feeling for the driver, except for a very small increase in fuel consumption.
- injection patterns RJnj associated with specific advance settings allows to inject enough fuel into the cylinder to allow mixing with the air without the risk of causing self-ignition.
- a portion of a quantity of fuel to be injected is injected during an engine cycle during an intake phase and the remaining portion of the quantity of fuel during a combustion phase. This RJnj action has no impact for the driver.
- Injection cut CJnj can cut the fuel supply inside the combustion chamber of a cylinder in which the "rumble" appears. The combustion is not done anymore and the "rumble” stops. This CJnj action has the effect of causing a sensation of jerk for the driver and is therefore generally used as a last resort.
- a method 106 limits the engine load as a function of a maximum ignition advance efficiency or a maximum ignition advance variation, referenced in both cases Lim Low, minimizing the risk of occurrence of rattling and the phenomenon of "rumble" while taking into account an octane fuel.
- the method 106 also makes it possible to limit cliquetis Lim Cli.
- the invention presents a method of immediate current load drop Lim ChC implemented by the system 10 and to protect the engine from the phenomenon of "rumble".
- the immediate current load drop Lim ChC intervenes among the first curative actions before the CJnj injection cutoff.
- the probability curve C1 of appearance of the "rumble” is calculated Cal_C1 by a mapping function of the engine speed R.
- a" rumble "manager integrated for example in the engine ECU, sends a registration order Enr P of the point regime / load P.
- the applicable load limit Lim ChC is then calculated via the module Cal_C2 by translation of the probability curve C1 of appearance of the "rumble” at the regimen point / load P recorded.
- We then obtain a load limitation curve C2 (see Figure 4).
- a parametric safety margin is applied and the calculation of this margin is achieved by a map based on engine R.
- the control method thus allows a speed of intervention because Lim ChC load limitation occurs from the first shots of "rumble" 101. Its effect is immediate or almost immediate in the case of a short delay.
- the level of load limitation being based on the first rumble 101 detected, it corresponds to the reality of the engine and is not parameterized in an excessively safe manner.
- N th shot "rumble" 101 is located in an area less loaded than 1 shot representing the basis for calculating Cal_C2 of the load limiting curve C2.
- the Lim ChC load limit is systematically above these operating points where the "rumble” has appeared, and does not prohibit the engine from exploiting a potential "rumble" zone.
- the N th rumble 101 may be in an area very close to the minimum load. eligible.
- the resulting Lim ChC load limit would bring the load below the minimum allowable level. This minimum load makes it possible for example to ensure the take-off of the vehicle when it is at a standstill.
- the calculation of the limit load Lim ChCs is not based only on the point of speed / load P during the 1st shot "rumble" 101 but is also based on a current point in Lim ChC load reduction application by the rumble manager.
- the determination of the applicable load limit Lim ChC comprises: a step of calculating the basic load limit Cal_C2 based on the curve of iso-likelihood curve C1 translated at the point of regime / charge P of appearance of the first shot,
- a minimum delta load delta Del_min is introduced which the method must perform when the Lim ChC load limiting application is requested by the load handler. "rumble".
- the presence of this minimum Del_min delta forces the load limit to be lower than that achieved during the application request. This is useful in case of increasing load so low or zero, or decreasing during the rise in speed R. In these cases, as described above, load limiting based on 1 hit "Rumble" would exceed 101 the load achieved during the application request. The delta of load drop Del_min would then be negative (because in the direction of the rise of load).
- the maximum load is always the Del_Pre drop delta to C2 load limiting based on 1 hit "rumble" as illustrated in Figure 10. This part of the process can be inhibited by calibration.
- the delta minimum delta is calculated by an indexed cartography under engine R mode.
- a maximum delta of achievable load drop Del_max is introduced that can be realized by the process when the request for application of the load limitation Lim ChC by the manager of "rumble". Indeed, for reasons of approval, it is not permissible to lower the load too much. This is useful in the case of a strongly increasing load during engine R rise.
- a maximum is taken into account between the Del_Pre pressure drop delta towards the C2 load limit. based on the first "rumble" 101 and the delta of maximum load Del_max, which in this case is the delta of maximum load drop Del_max, as is well represented in Figure 1 1.
- the minimum will always be the Del_Pre load drop delta towards the C2 load limitation based on the first "rumble" stroke, as illustrated in FIG. 12. Moreover, this part of the process can be inhibited by calibration and the maximum delta Del_max is calculated by an indexed cartography under engine R mode.
- a threshold S_min is introduced below which it is not possible to go down in order to avoid entering a zone of insufficient load (for takeoff for example).
- This threshold S_min is calculated by a map indexed in engine R mode.
- Lim_ChC MAX (S_min; MIN (Del_max; MAX (Del_min; C2)))
- C2 is the load limit based on the first "rumble" stroke
- S_min is the minimum allowable load threshold
- MIN is the function that selects the minimum of two values
- MAX is the function that selects the maximum from two values.
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1651621A FR3048263B1 (en) | 2016-02-26 | 2016-02-26 | METHOD FOR CONTROLLING THE COMBUSTION OF A THERMAL ENGINE BY AN IMMEDIATE LOAD DROP METHOD |
PCT/FR2017/050157 WO2017144789A1 (en) | 2016-02-26 | 2017-01-25 | Method for controlling the combustion of a combustion engine by way of an immediate load reduction method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3420213A1 true EP3420213A1 (en) | 2019-01-02 |
EP3420213B1 EP3420213B1 (en) | 2020-01-01 |
Family
ID=55752605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17706569.5A Active EP3420213B1 (en) | 2016-02-26 | 2017-01-25 | Method for controlling the combustion of a combustion engine by way of an immediate load reduction method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3420213B1 (en) |
CN (1) | CN108699986B (en) |
FR (1) | FR3048263B1 (en) |
WO (1) | WO2017144789A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111810302B (en) * | 2020-07-01 | 2021-11-12 | 东风汽车集团有限公司 | Method for determining maximum output torque of gasoline engine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2936017B1 (en) * | 2008-09-18 | 2015-09-04 | Inst Francais Du Petrole | METHOD FOR CONTROLLING THE COMBUSTION OF A CARBIDE MIXTURE FOR AN INTERNAL COMBUSTION ENGINE WITH A CONTROLLED IGNITION, IN PARTICULAR FOR A SUPER-POWERED ENGINE |
FR2942006B1 (en) * | 2009-02-11 | 2011-04-08 | Peugeot Citroen Automobiles Sa | METHOD FOR ADAPTING THE IGNITION ADVENT OF AN INTERNAL COMBUSTION ENGINE |
DE102011012722B4 (en) * | 2010-03-31 | 2019-09-12 | Mazda Motor Corp. | Method for detecting anomalous combustion for a spark-ignition engine and spark-ignition engine |
JP6055608B2 (en) * | 2012-04-26 | 2016-12-27 | 日立オートモティブシステムズ株式会社 | Engine control device |
JP6288991B2 (en) * | 2013-08-26 | 2018-03-07 | 大阪瓦斯株式会社 | Power generation system and control method thereof |
US10196999B2 (en) * | 2013-12-05 | 2019-02-05 | Ford Global Technologies, Llc | Method and system for pre-ignition control |
-
2016
- 2016-02-26 FR FR1651621A patent/FR3048263B1/en not_active Expired - Fee Related
-
2017
- 2017-01-25 CN CN201780012965.4A patent/CN108699986B/en active Active
- 2017-01-25 EP EP17706569.5A patent/EP3420213B1/en active Active
- 2017-01-25 WO PCT/FR2017/050157 patent/WO2017144789A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2017144789A1 (en) | 2017-08-31 |
CN108699986A (en) | 2018-10-23 |
EP3420213B1 (en) | 2020-01-01 |
FR3048263B1 (en) | 2018-03-16 |
FR3048263A1 (en) | 2017-09-01 |
CN108699986B (en) | 2021-07-23 |
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