EP3420214A1 - Procédé de gestion préventive de combustions anormales dans un moteur thermique - Google Patents
Procédé de gestion préventive de combustions anormales dans un moteur thermiqueInfo
- Publication number
- EP3420214A1 EP3420214A1 EP17707602.3A EP17707602A EP3420214A1 EP 3420214 A1 EP3420214 A1 EP 3420214A1 EP 17707602 A EP17707602 A EP 17707602A EP 3420214 A1 EP3420214 A1 EP 3420214A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- fouling
- cal
- counter
- calculating
- 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
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
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
-
- 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 method of preventive management of abnormal combustion in a heat engine.
- the invention finds a particularly advantageous, but not exclusive, application in the field of motor vehicles equipped with a gasoline type heat engine.
- a method to remove the phenomenon of "rumble” is to detect abnormal combustion via an accelerometer placed on the engine block, and cut the injection on the cylinders affected by the phenomenon. In case the Abnormal combustions persist, the process applies a load limitation over the entire motor field.
- the invention aims to effectively overcome these disadvantages by providing a combustion control method of a heat engine to protect it from a phenomenon of abnormal combustion generating vibrations in a cylinder called "shots", the vibrations having a frequency between 600 Hz and 1200 Hz, characterized in that the method comprises a step of calculating a load limitation of the heat engine as a function of a level of fouling of a combustion chamber and a step of application of the load limitation to the heat engine.
- the invention thus allows to implement a preventive method of protection against abnormal combustion due to fouling of the combustion chamber of the engine. Unlike existing curative methods, the invention aims to prevent abnormal combustion occurring. In addition, 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 comprises:
- the operating point of the engine is defined by a engine speed, a manifold pressure, an engine load, and a coolant temperature.
- the qualitative calculation step of fouling is based on a counter, said basic fouling counter, incrementing according to a first increment mapping for a temperature d cold oil indexed in engine speed and manifold pressure, a second increment map relative to a hot oil temperature indexed in engine speed and manifold pressure, and a barycenter relating to a coolant temperature .
- the step of calculating the amount of oil is based on a counter incrementing according to a map of increment of oil intake indexed in engine speed and manifold pressure , and a mapping transforming a value from the counter into a weighting factor for calculating the final fouling.
- the step of calculating the final fouling is performed by multiplying a value from the basic fouling counter with the weighting factor resulting from the calculation of the amount of oil brought into the cylinder. .
- a value obtained following the final fouling calculation step feeds a counter, said final fouling counter, incrementing or decreasing according to the operating point of the heat engine.
- the value from the counter is stored in a memory so as to ensure a continuity of calculation of the final fouling between each start of the engine.
- the load limitation is calculated by means of a map indexed by the value of the final fouling counter and the engine speed.
- the invention also relates to an engine computer having a memory storing software instructions for the implementation of the control method as defined above.
- the invention will be better understood on reading the description which follows and the examination of the figures that accompany it. These figures are given for illustrative but not limiting of the invention.
- FIG. 1 is a functional schematic representation of a system according to the present invention implementing different types of actions to remedy abnormal "rumble" type combustion;
- FIG. 1 is a functional illustration of a system 10 implementing a thermal engine combustion control method making it possible to treat a so-called "rumble” phenomenon in which the air / fuel mixture 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.
- 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 engine load Lim_ChE depending on 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 a running 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 the event of fouling of the combustion chamber, or else of permanently Lim_Chl when the causes of the "rumble” are irreversible, for example during engine parts breakage.
- a current load limitation Lim_ChC is set up with a rapid effect with a level of limitation just needed 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 a very small increase in fuel consumption.
- the modification of R_lnj injection schemes 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. Thus, 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 rattling and rumble while taking into account an octane number of the fuel.
- the method 106 also makes it possible to limit the pinging Lim_Cli.
- the following is the implementation of the preventive action 104 to prevent the engine prevent the phenomenon of "rumble" appearing because of a fouling of the combustion chamber.
- Fouling of the combustion chamber is a phenomenon leading to greatly increase the risk of occurrence of "rumble".
- the oil is deposited at a segment of a piston, and when the piston back to its top dead center, the oil film breaks and droplets are projected. These droplets contain reactive compounds which, depending on temperatures and pressures, vaporize and self-ignite, leading to the phenomenon of "rumble”.
- the role of the preventive method is then to limit the load of the engine Lim_ChE depending on a fouling rate of the combustion chamber so as to avoid a risk of occurrence of "rumble".
- a module 12 receives input information lnf_F related to the current operating point of the engine, such as engine speed, manifold pressure, engine load and a water temperature.
- the module 13 calculates a final fouling Cal_EnF of the combustion chamber in three stages.
- a qualitative calculation of fouling called basic Cal_EnB
- the module 14 is performed by the module 14 as a function of an operating point. More precisely, the qualitative calculation of the basic fouling Cal_EnB is based on a counter being a representation of the basic fouling. This counter is incremented according to the operating point information.
- This calculation is based on the use of an increment mapping, for a cold oil temperature, indexed in engine speed and manifold pressure, of an increment mapping, for a hot oil temperature, indexed in engine speed and manifold pressure, and a center of gravity whose center is the value of the water temperature.
- the calculation result is the value of the basic fouling counter from the center of gravity.
- a calculation of amount of oil Cal_Qh provided in the cylinder is made by the module 15 according to the current operating point of the engine. More specifically, the calculation of the amount of oil Cal_Qh brought into the cylinder is based on a counter representing the amount of oil Cal_Qh brought into the cylinder. This counter is incremented or decremented according to the operating point information. This calculation is based on the use of an oil increment / decrement map, indexed in engine speed and collector pressure, and a map transforming the value from the counter into a weighting factor. for the calculation of final fouling Cal_EnF.
- a calculation of the final fouling Cal_EnF of the combustion chamber is made by the module 13 according to the two previous calculations Cal_EnB and Cal_Qh. More precisely, the calculation of the final fouling Cal_EnF is carried out by multiplying the value resulting from the basic fouling counter with the weighting factor resulting from the calculation of the quantity of oil Cal_Qh brought into the cylinder. The value resulting from this multiplication feeds a counter that increments or decrements according to the operating point.
- the value resulting from the final fouling counter is saved in a memory, for example of the EEPROM type, so as to ensure the continuity of the calculation of the fouling rate between every engine start.
- the module 16 limits the load of the heat engine Lim_ChE as a function of the final fouling previously calculated.
- a maximum allowable load is calculated by a map indexed by the value of the counter of the final fouling and the engine speed. This maximum permissible load saturates the load setpoint of the heat engine, and thus makes it possible not to return in "rumble" condition.
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)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1651622A FR3048264B1 (fr) | 2016-02-26 | 2016-02-26 | Procede de gestion preventive de combustions anormales dans un moteur thermique |
| PCT/FR2017/050170 WO2017144790A1 (fr) | 2016-02-26 | 2017-01-25 | Procédé de gestion préventive de combustions anormales dans un moteur thermique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3420214A1 true EP3420214A1 (fr) | 2019-01-02 |
| EP3420214B1 EP3420214B1 (fr) | 2019-12-18 |
Family
ID=55752606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17707602.3A Active EP3420214B1 (fr) | 2016-02-26 | 2017-01-25 | Procédé de gestion préventive de combustions anormales dans un moteur thermique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3420214B1 (fr) |
| CN (1) | CN108699987A (fr) |
| FR (1) | FR3048264B1 (fr) |
| WO (1) | WO2017144790A1 (fr) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007224862A (ja) * | 2006-02-24 | 2007-09-06 | Toyota Motor Corp | 異常燃焼予測装置 |
| FR2935760B1 (fr) * | 2008-09-09 | 2010-09-17 | Peugeot Citroen Automobiles Sa | Procede de prediction du risque de pre-allumage d'un moteur a combustion interne |
| GB2473438B (en) * | 2009-09-09 | 2013-07-31 | Gm Global Tech Operations Inc | Method and device for closed-loop combustion control for an internal combustion engine |
| JP5556910B2 (ja) * | 2011-02-18 | 2014-07-23 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
| WO2013132613A1 (fr) * | 2012-03-07 | 2013-09-12 | トヨタ自動車株式会社 | Dispositif de commande pour moteur à combustion interne |
| JP2015057543A (ja) * | 2013-09-16 | 2015-03-26 | ダイヤモンド電機株式会社 | ガソリンエンジンの燃焼制御装置 |
| US10196999B2 (en) * | 2013-12-05 | 2019-02-05 | Ford Global Technologies, Llc | Method and system for pre-ignition control |
| JP6024700B2 (ja) * | 2014-04-11 | 2016-11-16 | トヨタ自動車株式会社 | エンジン回転速度制御装置 |
-
2016
- 2016-02-26 FR FR1651622A patent/FR3048264B1/fr not_active Expired - Fee Related
-
2017
- 2017-01-25 WO PCT/FR2017/050170 patent/WO2017144790A1/fr not_active Ceased
- 2017-01-25 CN CN201780013191.7A patent/CN108699987A/zh active Pending
- 2017-01-25 EP EP17707602.3A patent/EP3420214B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3048264B1 (fr) | 2020-01-03 |
| FR3048264A1 (fr) | 2017-09-01 |
| WO2017144790A1 (fr) | 2017-08-31 |
| CN108699987A (zh) | 2018-10-23 |
| EP3420214B1 (fr) | 2019-12-18 |
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