EP2534355B1 - Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en oeuvre un tel procede - Google Patents

Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en oeuvre un tel procede Download PDF

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Publication number
EP2534355B1
EP2534355B1 EP11708058.0A EP11708058A EP2534355B1 EP 2534355 B1 EP2534355 B1 EP 2534355B1 EP 11708058 A EP11708058 A EP 11708058A EP 2534355 B1 EP2534355 B1 EP 2534355B1
Authority
EP
European Patent Office
Prior art keywords
engine
stability
pmh
instant
speed
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.)
Active
Application number
EP11708058.0A
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German (de)
English (en)
French (fr)
Other versions
EP2534355A1 (fr
Inventor
Frédéric Gourves
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Publication of EP2534355A1 publication Critical patent/EP2534355A1/fr
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    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
    • 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
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient
    • 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
    • F02D2250/28—Control for reducing torsional vibrations, e.g. at acceleration
    • 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

Definitions

  • the invention relates to the field of controlling the operating stability of combustion engines.
  • Spark ignition engines have, especially during their operation at partial load, a lower intake pressure at atmospheric pressure. This pressure below atmospheric pressure creates so-called pumping losses which lead to overconsumption of fuel, due to additional work imposed on the engine pistons during the intake phases.
  • valve crossing is the particular result of an exhaust delay and an advance on admission. It has the effect of facilitating the aspiration of fresh gases with the flue gases which facilitates the filling of the cylinder.
  • a control method in which the stability of a combustion engine is more precisely characterized, in particular during the transient operating phases (phases of variation of the speed of rotation of the engine).
  • This method makes it possible to adapt the operating parameters of the engine having an influence on its stability such as the ignition advance or the richness, but is particularly advantageous for adapting the crossover valves and thus optimize fuel consumption. transient engine.
  • the engine control set tends to optimize the crossing of the valves to reduce the fuel consumption of the engine while respecting the stability guideline.
  • the method according to the invention is particularly advantageous for regulating the crossing of the valves to reduce the engine consumption, especially in the operating phases of the engine at low and medium load.
  • the optimization of the valve crossover consists in applying the opening instructions of the intake and exhaust valve closing valves to minimize the fuel consumption, by maximizing the crossing period during which the intake and exhaust valves are simultaneously open, and positioning these openings and closures in the engine cycle as well as possible.
  • the method is applicable to the regulation of other parameters influencing the engine operating stability (ignition advance and richness), but this is not its preferential application, because there are other reliable and simpler methods for regulate: by construction of a stability index as known in the prior art for the stabilized phases, especially immediately after starting the engine, or by using specific probes during the transient phases.
  • a backup strategy is implemented in case of stability deviation greater than a predetermined threshold.
  • High engine instability can lead to engine failure.
  • a backup strategy helps to ensure the reliability of the engine.
  • Such a strategy consists in rapidly returning the engine to an operating point on which its stability is ensured, for example by applying a zero valve crossover, and conservative instructions for ignition advance and richness.
  • the process steps are repeated with each combustion in the engine.
  • a rapid regulation of the parameter in question is obtained, which makes it possible in particular to optimize this parameter by having at all times of the operation of the engine a stability index very close to the stability setpoint.
  • the method is implemented during phases of transient operation of the engine. It can also be used during stabilized operation phases. It is indeed in the transient operating phases that the process developed in the invention is of great interest. Indeed, taking into account a function of the derivative of the engine speed, reflecting the evolution of the engine speed, allows the creation of an index representative of the engine operating stability, including while its engine speed is changing, that is to say during its operation in transient phase.
  • Is is the stability index
  • d ⁇ measured d t is the measured time derivative of the engine speed at the time of calculation, which corresponds to a time when a combustion occurs in a cylinder of the engine
  • d ⁇ Theoretical d t is the estimated time derivative of the engine speed as a function of its estimated torque at the instant of calculation and of the inertia opposing the variation of its rotational speed
  • ⁇ measured is the engine speed measured at the instant of calculation
  • T PMH is the elapsed time at the computation time since previous combustion.
  • ⁇ PMH_n is the engine speed at the time of calculation
  • ⁇ PMH_n- 1 the speed at the moment of the preceding combustion.
  • the invention also relates to a control system of an internal combustion engine, implementing the method according to one of the preceding claims.
  • FIG. 1 is a general block diagram of the process according to the invention
  • the figure 2 represents an example of a control strategy implemented by the process according to the invention
  • the figure 3 represents a calculation module of the regulator of the figure 1
  • the figure 1 describes, using block diagrams, the implementation of the method according to the invention.
  • a supervisor 1 determines, for example according to the operating conditions of a motor 2, whether or not the method according to the invention is implemented.
  • the stability of the engine 2 is determined by a calculation function of a stability indicator 3, which gives as a result a stability indicator Is.
  • a calculator 4 supplies a stability setpoint Cs, for example by means of a map specific to the engine 2.
  • a comparator 5 calculates the difference between the two values Cs and Is, to output a signal Es, called deviation or stability error.
  • the stability difference Es is then supplied to a regulator 6, in the example a P.I.D type regulator. (derivative integral proportional), but this can be of any other type (LQ, Hinfini, etc.).
  • the regulator then takes into account the stability difference Es to calculate a valve crossing setpoint, that is to say in practice an opening setpoint of the intake OA and a setpoint of closing of the exhaust valves FE.
  • This setpoint is transmitted to the engine control member to be applied to the intake and exhaust phase shifters.
  • the stability indicator must allow to quickly and reliably detect the combustion quality even in transient regime.
  • the stability is characterized in the invention by an index, a function of the difference between the derivative of the engine speed as measured (or more precisely, as calculated using engine speed measurements) with the estimated derivative that the engine should have due to the engine torque at the time of calculation. This makes it possible to obtain a representative stability index even in the transient motor operating phases.
  • This calculation is preferably performed at each combustion of the engine.
  • the regime is measured also with each combustion.
  • This calculation can be averaged over several points in order to perform a low-pass filtering.
  • the figure 2 shows an example of the course of the engine control strategy, implemented by the method according to the invention.
  • the engine control device involving a method according to the invention will calculate a crossover instruction of the distribution, according to a first index of stability calculated.
  • the regulation thus achieved will increase the crossing of the valves as long as the engine remains stable (relative to the stability set), and this, according to a variant of the invention, to a certain predetermined limit.
  • a backup strategy is applied, which may for example consist of the adoption of a crossing instruction of the predefined distribution and ensuring the stability of a certain way, for example a zero crossing (request for rapid "uncrossing" of the engine), possibly accompanied by the adoption of instructions for steering the advance to the ignition and wealth
  • One or more of these functions are active according to the operating strategy determined by the supervisor 1.
  • the invention thus proposes a method making it possible to change the level of crossing of the distribution of an engine according to its stability, in order to adopt an adjustment allowing the maximum consumption gains obtained by the crossing.
  • it is possible to enslave the crossing at a desired level of stability so as to limit the maximum consumption of the engine.
  • the invention can also be applied to the regulation of other parameters affecting the stability of the engine, such as the wealth or the ignition advance, aiming to obtain a larger amount of energy available at exhaust and / or reduction of polluting emissions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP11708058.0A 2010-02-09 2011-02-02 Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en oeuvre un tel procede Active EP2534355B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1050874A FR2956161B1 (fr) 2010-02-09 2010-02-09 Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en oeuvre un tel procede
PCT/FR2011/050203 WO2011098708A1 (fr) 2010-02-09 2011-02-02 Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en œuvre un tel procede

Publications (2)

Publication Number Publication Date
EP2534355A1 EP2534355A1 (fr) 2012-12-19
EP2534355B1 true EP2534355B1 (fr) 2013-12-11

Family

ID=42735554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11708058.0A Active EP2534355B1 (fr) 2010-02-09 2011-02-02 Procede de regulation d'un parametre de fonctionnement d'un moteur et systeme de commande mettant en oeuvre un tel procede

Country Status (4)

Country Link
EP (1) EP2534355B1 (zh)
CN (1) CN102782296B (zh)
FR (1) FR2956161B1 (zh)
WO (1) WO2011098708A1 (zh)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1050874A (fr) 1952-02-15 1954-01-12 Appareil protecteur pour dégauchisseuse à bois et matières similaires
US6993427B2 (en) * 2002-09-03 2006-01-31 Toyota Jidosha Kabushiki Kaisha Combustion state estimating apparatus for internal combustion engine
DE102005014920A1 (de) * 2005-04-01 2006-04-13 Audi Ag Verfahren zur zylinderindividuellen Einstellung von Einspritzzeiten einer Verbrennungskraftmaschine
EP1914411B1 (en) * 2005-07-14 2009-09-16 Ford Global Technologies, LLC Method for monitoring combustion stability of an internal combustion engine
DE102006026640A1 (de) * 2006-06-08 2007-12-13 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
JP2008138579A (ja) * 2006-12-01 2008-06-19 Denso Corp 内燃機関の可変バルブタイミング制御装置
FR2909722B1 (fr) 2006-12-08 2009-11-20 Peugeot Citroen Automobiles Sa Procede et systeme de regulation des parametres de fonctionnement d'un moteur thermique a injection reduisant les emissions polluantes

Also Published As

Publication number Publication date
CN102782296B (zh) 2015-07-29
CN102782296A (zh) 2012-11-14
WO2011098708A1 (fr) 2011-08-18
FR2956161B1 (fr) 2012-02-03
EP2534355A1 (fr) 2012-12-19
FR2956161A1 (fr) 2011-08-12

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