EP1445458A1 - Verfahren zur Abschätzung des Luft/Krafstoffverhältnisses eines Motors, dieses verwendende Motorregelung, und entsprechende Vorrichtung - Google Patents

Verfahren zur Abschätzung des Luft/Krafstoffverhältnisses eines Motors, dieses verwendende Motorregelung, und entsprechende Vorrichtung Download PDF

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Publication number
EP1445458A1
EP1445458A1 EP04290240A EP04290240A EP1445458A1 EP 1445458 A1 EP1445458 A1 EP 1445458A1 EP 04290240 A EP04290240 A EP 04290240A EP 04290240 A EP04290240 A EP 04290240A EP 1445458 A1 EP1445458 A1 EP 1445458A1
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European Patent Office
Prior art keywords
engine
air
oxygen
exhaust
fuel
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Application number
EP04290240A
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English (en)
French (fr)
Inventor
Jamil Abida
Emmanuel Buis
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Renault SAS
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Renault SAS
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Publication of EP1445458A1 publication Critical patent/EP1445458A1/de
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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
    • F02D41/02—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
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F02D41/1458—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with determination means using an estimation
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control

Definitions

  • the invention relates to a method for estimating the ratio. air / fuel of an internal combustion engine having exhaust gas recirculation means. It relates to also a method of controlling an engine using the method estimation, and a control device for the implementation of these processes.
  • the pollutant emission standards impose a increasingly fine control of combustion and of the air circuit internal combustion engines, in particular through the control of the exhaust gas recirculation (EGR) circuit, turbocharger, intake heat exchanger, flap admission, etc. Pollutant emissions are directly linked to the richness of the cylinder of the air / fuel mixture entering the engine. Knowledge of this parameter therefore appears essential for check the engine.
  • EGR exhaust gas recirculation
  • UEGO sensor universal exhaust gas oxygen sensor
  • oxidants mainly oxygen
  • reducing agents carbon monoxide, hydrocarbons unburnt
  • the signal delivered by the probe can be picked up as a voltage.
  • engine control strategies often use dilution of the engine intake air by some of the gases exhaust that is recirculated to the intake (EGR).
  • EGR exhaust that is recirculated to the intake
  • This process has already shown its interest in reducing emissions of nitrogen oxides in engine exhaust, in particular particularly in the case of operation with a mixture air / fuel with excess air (lean mixture). This is the general case of operation of the diesel or petrol engine in mixture poor ("lean burn").
  • the richness value R obtained by the calculation or by the measurement only takes into account the "fresh" air supplied by the circuit intake and ignores the air, and therefore oxygen, supplied via the EGR circuit. Therefore, the error between this wealth value R and the true cylinder richness value can be important, especially on engine operating points with a high EGR rate (fraction of EGR flow in the total gas flow admitted into the engine).
  • the exhaust probe measures a richness of 0.384 while the cylinder wealth is only 0.237, or more than 61% error.
  • R cyl K ' s Q carb Q O 2 word or K s ' : ratio of oxygen flow rate to fuel flow rate in the case of stoichiometry, Q carb : flow rate of fuel injected into the cylinders, Q O 2mot : flow of oxygen admitted into the cylinders, sum of the oxygen coming from the "fresh" air and that brought back by the EGR gases.
  • Document FR-2 793 846 provides an estimate of the air flow total at engine inlet, sum of fresh air and air supplied by EGR.
  • the solution exposed uses complex calculations which require many sensor measurements, so that measurement uncertainties penalize the accuracy of the result.
  • the invention aims to overcome these drawbacks by proposing a simple method of determining cylinder richness via a estimate, and of the oxygen content of the gases admitted into the engine. It also proposes a method for controlling an engine using the cylinder richness obtained in order to obtain a fine adjustment of the conditions of combustion of the engine.
  • the invention has the advantage of not requiring the calculation of the recirculation gas flow.
  • the oxygen rate in the engine exhaust is measured by means of a proportional probe placed at the level of the gas exhaust system.
  • Such engine control as a function of cylinder richness has many advantages. It allows for example to homogenize the control of the various actuators of the air intake circuit.
  • the different set point maps usually used for control the EGR valve, the turbocharger or the shutter the air intake can then be replaced by a single mapping, thus simplifying the development of the engine.
  • transition problems occur when switching from a normal operating mode to a wealth regulation mode used during the phases of regeneration of exhaust gas treatment systems.
  • a permanent control of the actuators according to the cylinder richness helps to remove these problems.
  • two or more motor actuators are controlled independently of each other.
  • two or more motor actuators are controlled by taking into account the states of the other actuators in order to reduce the difference between the setpoint and the estimated value. This variant allows not to dissociate the controls of the different actuators and favor, depending on the situation, the use of one over another, in order to obtain optimal combustion conditions.
  • Another object of the invention relates to a device for controlling an internal combustion engine, said engine comprising at least one air intake circuit, a gas exhaust circuit comprising means for recirculating gas from exhaust in the intake circuit, means for injecting fuel into the engine and an engine control system, said device further comprising a proportional oxygen measurement probe [ O 2 ec ] located on the circuit exhaust and a computer connected to the control system, said computer being able to receive and record the measured value and being programmed to estimate the cylinder richness by implementing the estimation method described above.
  • the engine control system is programmed for the implementation of the engine control process.
  • a combustion engine is represented internal 10, its air intake circuit and its evacuation circuit exhaust gas.
  • the air Before entering the engine 10, the air follows the intake circuit described below. It passes through an air filter 12, then a compressor 14 of a turbocharger 16 in order to be compressed. He is then cooled by an exchanger 18 and arrives at the air intake manifold 20 before being introduced into the cylinders of the engine 10 (not shown).
  • a means for measuring the air flow such as a flow meter 22, is placed at the outlet of the air filter 12 and before the intake manifold 20. Before the intake manifold 20, and after the heat exchanger 18, a control valve (or intake flap) 24 is placed in order to control the quantity of fresh air introduced into the intake manifold 20. Means for measuring the temperature and the pressure 25 are also provided for measure the temperature T coll (K) and the absolute pressure P coll (Pa) in the intake manifold 20.
  • the exhaust gases are directed to a turbine 15 of turbocharger 16, then to a device for treatment 26, such as a nitrogen oxide trap (Nox-trap) and a particles, before being released into the atmosphere.
  • a device for treatment 26 such as a nitrogen oxide trap (Nox-trap) and a particles
  • Part of the gases engine exhaust is redirected to the intake manifold 20, via an EGR recirculation circuit 28 comprising a valve regulation 30.
  • a proportional probe 32 such as a UEGO probe, is placed on the exhaust gas circuit to measure the rate of oxygen they contain. This probe is preferably placed after the turbine 15 of the turbocharger for a more precise measurement.
  • a control system 34 controls the various actuators of the engine, such as for example the valves 24 and 30 of the device, as well as the turbocharger 16. It is connected to a computer 36 which receives the information coming from the flow meter 22, from the measuring means of temperature and pressure 25, of the proportional probe 32. It also receives the engine operating data, such as the engine rotation speed (N word , in rpm) and the injected fuel flow rate (Q carb , in kg / s).
  • Fuel is injected into the engine cylinders by means of fuel injection 38 connected to the reservoir of vehicle fuel (not shown). They are controlled by the control system 34 and possibly connected to the computer 36.
  • the oxygen rate at the engine exhaust [ O 2 ec ] is measured by means of the proportional probe 32.
  • the latter provides a voltage value Us which is translated into oxygen rate by means of a memorized pre-calibrated table.
  • the oxygen rate thus obtained is then stored.
  • the engine speed ( N word ) can be measured or calculated in a known manner.
  • this solution is implemented in the following manner: the values (P coll , T coll ) are measured by the temperature and pressure measurement means 25 of the intake manifold, the operating data N word and Q carb are determined as described above, then the mass flow rate of oxygen admitted into the engine is determined from these values recorded by means of equation (5).
  • the computer 36 is for example programmed for this purpose.
  • the values (P coll , T coll ) are measured by the temperature and pressure measurement means of the intake manifold 25 and the value Q air is measured by the flow meter 22. These values, as well as the operating data (N word , Q carb ) are recorded. Then, the mass flow of oxygen admitted into the engine is determined by means of the system of differential equations (6). The recording and the calculations are for example carried out by the computer 36 programmed for this purpose.
  • K ' s represents the ratio of the oxygen / fuel flow rates under the stoichiometric conditions of the combustion equation
  • the cylinder richness estimation process R cyl can be implemented for any engine comprising a gas recirculation circuit.
  • the engine can be a lean mixture diesel or gasoline engine. It can also be used for engines not comprising a turbocharger 16 and a heat exchanger 18.
  • other means of determination, by calculation or measurement, can be used to determine the values of the various parameters to be each step.
  • the computer 36 can be an integral part of the control system 34 or be separate.
  • An example of application of this estimate of the cylinder richness R cyl is its use for a method of controlling an internal combustion engine, as described below.
  • a method for controlling an engine comprising at least one air intake circuit, a gas exhaust circuit comprising means for recirculating the exhaust gases in the intake circuit. , fuel injection means 38 into the engine and a control system 34 of the engine connected to the various actuators of the engine.
  • two or more motor actuators are controlled independently of each other. This variant is the simplest since we do not take into account relationships between the different actuators. Each actuator is then controlled following a loop which performs the steps cylinder wealth estimation, comparison with the value of setpoint and control cylinder richness of this actuator if a deviation is noted.
  • the states of the other actuators are taken into account in order to reduce the difference between the set value and the estimated value, so as to consider these relationships and improve the combustion of the engine. Not all actuators are then necessarily ordered at the same time.
  • the process can control the said actuator (s) chosen from the shutter 24 of the air intake manifold, the turbocharger 16, the EGR control valve 30, the fuel injection means 38. This command is carried out via the control system 34.
  • valves 24 and 30 are controlled by the control system 34 which controls their opening percentage.
  • the control system 34 which controls their opening percentage.
  • the control is performed by the control system 34 which controls the percentage opening of this valve.
  • cylinder wealth estimation and engine control can be considered without departing from the scope of the invention.
  • the device can be simplified or include other actuators.
EP04290240A 2003-02-07 2004-01-30 Verfahren zur Abschätzung des Luft/Krafstoffverhältnisses eines Motors, dieses verwendende Motorregelung, und entsprechende Vorrichtung Withdrawn EP1445458A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0301466 2003-02-07
FR0301466A FR2851014B1 (fr) 2003-02-07 2003-02-07 Procede d'estimation du rapport air/carburant d'un moteur, procede de controle d'un moteur utilisant celui-ci et dispositif correspondant

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EP1445458A1 true EP1445458A1 (de) 2004-08-11

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EP04290240A Withdrawn EP1445458A1 (de) 2003-02-07 2004-01-30 Verfahren zur Abschätzung des Luft/Krafstoffverhältnisses eines Motors, dieses verwendende Motorregelung, und entsprechende Vorrichtung

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EP (1) EP1445458A1 (de)
FR (1) FR2851014B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2982641A1 (fr) * 2011-11-14 2013-05-17 Renault Sa Systeme et procede d'estimation de la richesse du melange gazeux dans la chambre de combustion d'un moteur a combustion interne d'un groupe motopropulseur de vehicule automobile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243534A2 (de) * 1986-04-26 1987-11-04 F & O Electronic Systems GmbH Verfahren zur Abgasentgiftung einer Verbrennungskraftmaschine unter Verwendung eines katalytischen Systems und Vorrichtung zur Durchführung des Verfahrens
US5265458A (en) * 1991-06-14 1993-11-30 Ngk Insulators, Ltd. Method of compensating output of air/fuel ratio sensor for variation in the current sensitivity to oxygen
US5974870A (en) * 1996-03-15 1999-11-02 Siemens Aktiengesellschaft Process for model-assisted determination of the fresh-air mass flowing into the cylinders of an internal combustion engine with external exhaust-gas recycling
EP1223328A1 (de) * 2001-01-12 2002-07-17 MAGNETI MARELLI POWERTRAIN S.p.A. Verfahren zur Bestimmung des Frischgases in einem Saugrohr eines Verbrennungsmotors mit Abgasrückführung
EP1245810A2 (de) * 2001-03-30 2002-10-02 Nissan Motor Co., Ltd. Methode und System für das Steuern einer Maschine mit verbesserter Momentsteuerung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150694A (en) 1991-11-22 1992-09-29 General Motors Corporation Diesel engine closed loop air/fuel ratio control
DK0892124T3 (da) 1997-07-14 2004-06-01 Alcan Gmbh Aftrækkelig beskyttelsesfolie til metalblikbaner eller metalblikstriber
DE19900729A1 (de) 1999-01-12 2000-07-13 Bosch Gmbh Robert System zum Betreiben einer Brennkraftmaschine insbesondere für ein Kraftfahrzeug
FR2805567B1 (fr) 2000-02-28 2002-12-06 Peugeot Citroen Automobiles Sa Systeme de controle du fonctionnement d'un moteur diesel de vehicule automobile
JP3918402B2 (ja) 2000-05-18 2007-05-23 日産自動車株式会社 ディーゼルエンジンの制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243534A2 (de) * 1986-04-26 1987-11-04 F & O Electronic Systems GmbH Verfahren zur Abgasentgiftung einer Verbrennungskraftmaschine unter Verwendung eines katalytischen Systems und Vorrichtung zur Durchführung des Verfahrens
US5265458A (en) * 1991-06-14 1993-11-30 Ngk Insulators, Ltd. Method of compensating output of air/fuel ratio sensor for variation in the current sensitivity to oxygen
US5974870A (en) * 1996-03-15 1999-11-02 Siemens Aktiengesellschaft Process for model-assisted determination of the fresh-air mass flowing into the cylinders of an internal combustion engine with external exhaust-gas recycling
EP1223328A1 (de) * 2001-01-12 2002-07-17 MAGNETI MARELLI POWERTRAIN S.p.A. Verfahren zur Bestimmung des Frischgases in einem Saugrohr eines Verbrennungsmotors mit Abgasrückführung
EP1245810A2 (de) * 2001-03-30 2002-10-02 Nissan Motor Co., Ltd. Methode und System für das Steuern einer Maschine mit verbesserter Momentsteuerung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2982641A1 (fr) * 2011-11-14 2013-05-17 Renault Sa Systeme et procede d'estimation de la richesse du melange gazeux dans la chambre de combustion d'un moteur a combustion interne d'un groupe motopropulseur de vehicule automobile
WO2013072218A1 (fr) * 2011-11-14 2013-05-23 Renault S.A.S. Système et procédé d'estimation de la richesse du mélange gazeux dans la chambre de combustion d'un moteur à combustion interne d'un groupe motopropulseur de véhicule automobile
CN103975149A (zh) * 2011-11-14 2014-08-06 雷诺股份公司 用于估算机动车辆动力装置的内燃发动机的燃烧室中气体混合物的富燃料度的系统和方法
CN103975149B (zh) * 2011-11-14 2017-03-15 雷诺股份公司 用于估算机动车辆动力装置的内燃发动机的燃烧室中气体混合物的富燃料度的系统和方法
US9599056B2 (en) 2011-11-14 2017-03-21 Renault S.A.S. System and method for estimating the richness of the gaseous mixture in the combustion chamber of an internal combustion engine of a motor vehicle power plant

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FR2851014A1 (fr) 2004-08-13
FR2851014B1 (fr) 2008-03-14

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