EP1313935B1 - Procede de determination de la teneur en azote de gaz d'echappement azotes issus de moteurs thermiques - Google Patents

Procede de determination de la teneur en azote de gaz d'echappement azotes issus de moteurs thermiques Download PDF

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Publication number
EP1313935B1
EP1313935B1 EP01960712A EP01960712A EP1313935B1 EP 1313935 B1 EP1313935 B1 EP 1313935B1 EP 01960712 A EP01960712 A EP 01960712A EP 01960712 A EP01960712 A EP 01960712A EP 1313935 B1 EP1313935 B1 EP 1313935B1
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EP
European Patent Office
Prior art keywords
detected
combustion
gravity
centre
cylinder
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.)
Expired - Lifetime
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EP01960712A
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German (de)
English (en)
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EP1313935A1 (fr
Inventor
Helmut Daudel
Günter Prof. Dr.-Ing. HOHENBERG
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.)
Mercedes Benz Group AG
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DaimlerChrysler AG
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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
    • 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
    • F02D35/028—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the combustion timing or phasing
    • 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
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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
    • F02D41/146—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 NOx content or concentration
    • F02D41/1461—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 NOx content or concentration of the exhaust gases emitted by the engine
    • F02D41/1462—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 NOx content or concentration of the exhaust gases emitted by the engine 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
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/36—Control for minimising NOx emissions

Definitions

  • the invention relates to a method for determining the nitrogen oxide content in oxygen-containing exhaust gases of internal combustion engines, according to the preamble of claim 1 (see, for example, US-A-4 556 030).
  • DE 198 01 626 A1 has already proposed a method for the diagnosis of a catalytic converter in the exhaust gas of internal combustion engines, which has both an oxygen and a nitrogen oxide storage capability.
  • this method it is provided that a first phase shift between a reduction of the oxygen concentration and one on it following reaction of the probe and a second phase shift between subsequent increase in the oxygen concentration and a subsequent reaction of the probe is detected.
  • the difference in the phase shift is determined and an error signal is stored and / or output when said difference does not reach a predetermined threshold.
  • EP 0 783 918 A1 discloses a method for reducing the nitrogen oxide content in oxygen-containing exhaust gases of internal combustion engines, in particular of diesel engines and direct injection gasoline engines for motor vehicles.
  • the nitrogen oxides are reduced by means of a depending on operating parameters to the exhaust metered reducing agent on a catalyst.
  • hydrogen / or hydrocarbon is used as the reducing agent, wherein in a first operating range of the internal combustion engine only hydrogen, in a second operating range both hydrogen and hydrocarbon and in a third operating range only hydrocarbon upstream of the catalyst is supplied to the exhaust gas.
  • the invention is therefore based on the object to provide a method for determining the nitrogen oxide content in oxygen-containing exhaust gases of internal combustion engines, with which the nitrogen oxide emission can be determined on the basis of the actual influencing variables.
  • This object is achieved by a method for determining the nitrogen oxide content in oxygen-containing exhaust gases of internal combustion engines with the features of claim 1.
  • NO x emission nitrogen oxide emission
  • Such a determination serves, for example, for the precalculation of NO x emissions and the experimental design, as well as plausibility checks of measured values such as indexing data and NO x values.
  • the computational determination of NO x with the current simulation models is completely insufficient for NO x determination.
  • a control and regulation algorithm for vehicle use can not be represented with these calculation models.
  • the present invention makes it possible to calculate the NO x emission exactly, since this calculation is based on values from the actual influencing variables on the NO x emission.
  • the level of NO x emission of an internal combustion engine depends primarily on the local temperature, the oxygen concentration and the residence time of the cylinder charge in the combustion chamber. Leave the last two sizes relatively easy to detect by measuring the engine speed of the air used and the amount of fuel. In contrast, it is much more difficult to determine the gas temperature in the combustion chamber.
  • the present invention therefore proposes to use a different size, which correlates directly with the gas temperature relevant for the formation of nitrogen oxide.
  • the gas temperature depends crucially on the focus of the combustion, which is the location of the 50% conversion of the fuel with respect to the piston position OT, it is advantageous to use the center of gravity or a comparable variable such as the position of the maximum energy conversion as a reference for the NO x - to choose emission. From this value for the focus of the combustion and the values of the detected fuel quantity and air mass, the amount of NO x emission is calculated, for example, with the aid of neural networks.
  • the determination of the center of gravity of the combustion is preferably carried out by measuring the combustion chamber pressure profile.
  • a pressure sensor is provided in the region of the combustion chamber. This type of determination of the center of gravity of combustion is extremely accurate.
  • pressure sensors are provided for determining the center of gravity of the combustion, then there are further advantages, in particular with regard to the monitoring of the maximum pressure for error detection, for determining the operating mode and the like.
  • the amount of recirculated exhaust gas is detected and a corresponding signal is supplied to the electrical circuit and this signal is included in the calculation of the amount of NO x emission.
  • the oxygen concentration in the exhaust gas is detected and a corresponding signal is supplied to the electrical circuit and that this signal is included in the calculation of the amount of NO x emission.
  • the speed of the internal combustion engine is detected and a corresponding signal is supplied to the electrical circuit and that this signal is included in the calculation of the amount of NO x emission.
  • a cylinder block 1 comprising four cylinders 2 is shown. Each of the cylinders is associated with a located in the combustion chamber pressure sensor 3. These pressure sensors 3 are connected by means of connecting lines 4 to inputs of a signal conditioning 5.
  • the signal conditioning 5 is part of an electronic circuit 6, which also includes an engine electronics 7.
  • the crankshaft of the internal combustion engine is a disc 8, which may form the flywheel, for example, at the same time, arranged, said disc 8 is associated with a Winkelmarkengeber 9.
  • This angle encoder 9 is connected via a line 10 to an input of the signal conditioning 5.
  • the cylinder block 1 is shown schematically as a longitudinal section through the cylinder 2, wherein in the cylinder 2, a piston 12 is slidably guided, wherein the upper side of the piston 12 defines a combustion chamber 11.
  • the cylinder 2 is closed at its top by a cylinder head 13, wherein in the cylinder head 13, an inlet valve 14 and an outlet valve 17 are arranged.
  • an inlet valve 14 Through the inlet valve 14, the required combustion air from the suction pipe 15 can flow into the cylinder 2, wherein the respective air mass is detected in an air mass meter 16.
  • the air mass meter 16 is connected via a line 22 to the electronic circuit 6.
  • the combustion gases pass into an exhaust pipe 18, which leads to a catalyst arrangement, not shown in the drawing. It is provided a branching off from the exhaust pipe 18 exhaust gas recirculation line 19, which opens downstream of the air mass meter 16 in the intake manifold 15. In this exhaust gas recirculation line 19 is a return flow sensor 20 which detects the mass of the recirculated exhaust gas and transmits corresponding signals via a sensor line 21 to the electronic circuit 6.
  • a measuring device 24 for the fuel mass is connected via an electrical line 27 to the circuit 6 and the injection pump 23 is provided with a control line 28 whose other end is located on the circuit 6.
  • the device described in FIGS. 1 and 2 makes it possible to measure the pressure curve in the combustion chamber 11 with the aid of the pressure sensor 3. From the pressure curve, the center of gravity S of the combustion can be determined, wherein the position of the center of gravity is 50% of the conversion of the fuel.
  • the position of the center of gravity S changes with respect to the crank angle when the combustion course changes, as shown in FIG. 3 is shown. If 50% of the supplied energy is converted, then there is the focus S. With the dashed line in Fig. 3 it is shown that with a changed course of combustion, for example, by a later start of injection also another position of the center of gravity is recorded, in Fig 3 with S 1 is indicated.
  • a monitoring of the peak pressure P max and its location, based on the crank angle, take place. Further, it is possible to perform monitoring for the uniformity of combustion in the indicated cylinders. Furthermore, the use of an additional NO x sensor for redundancy of the system is possible, wherein a comparison of the measured value with the calculated value for NO x can be done.
  • the determined values for NO x can be used for the control or regulation of exhaust aftertreatment systems.
  • the present invention is not only suitable for carrying out tests in test stands, but is also particularly suitable for use in the vehicle, that is, in the so-called on-board diagnosis, a constant calculation and control of NO x emissions is possible.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

Lors du fonctionnement de moteurs thermiques, un mélange de combustibles est comprimé dans une chambre de combustion (11) dans au moins un cylindre (2) par un piston (12) pouvant se déplacée dans celui-ci de façon alternée. Dans le cadre d'un procédé de détermination de la teneur en azote de gaz d'échappement azotés, la quantité de carburant alimentant le cylindre (2) et la masse d'air circulant dans un tuyau d'aspiration (15) sont déterminées, et transmises à un circuit électronique (6). De plus, à partir d'au moins une valeur de mesure courante du fonctionnement du moteur, une détermination du centre de gravité (S) de la combustion est réalisée et, à partir de la valeur obtenue pour le centre de gravité (S) de la combustion, ainsi qu'en prenant en considération les valeurs obtenues pour la quantité de carburant et la masse d'air, la valeur des émissions d'oxyde d'azote est déterminée.

Claims (8)

  1. Procédé de détermination de la teneur en oxyde d'azote dans les gaz d'échappement contenant de l'oxygène de moteurs à combustion interne, dans lequel un piston se déplaçant alternativement (12) comprime un mélange de carburant dans une chambre de combustion (11) dans au moins un cylindre (2), et dans lequel la quantité de carburant associée au cylindre (2) et la masse d'air circulant dans un conduit d'admission (15) sont détectées et leur valeurs sont délivrées à un circuit électronique (6), caractérisé en ce qu'une détermination du centre de gravité (S) de la combustion résulte d'au moins une valeur de mesure réelle du fonctionnement du moteur, dans lequel la position du centre de gravité est atteinte à 50% de la conversion du carburant, et en ce que, ensuite, la teneur de l'émission d'oxyde d'azote est calculée à partir de la valeur pour le centre de gravité (S) de la combustion ainsi que des valeurs de la quantité de carburant et de la masse d'air détectées.
  2. Procédé selon la revendication 1, caractérisé en ce que, au moyen d'un capteur (3), la courbe de pression est détectée dans la chambre de combustion (11) et au moins un signal correspondant à la courbe de pression est délivré au circuit électronique (6) et à partir de là, le centre de gravité (S) de la combustion est déterminé.
  3. Procédé selon la revendication 1, caractérisé en ce que le circuit électronique (6) comprend l'électronique de moteur (7), dans laquelle un modèle de calcul est disposé, par l'intermédiaire duquel le centre de gravité (S) de la combustion ou une grandeur comparable comme par exemple la position de la conversion d'énergie maximale est calculée à partir du moment respectif du début d'injection (A).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que, au moyen d'un capteur (20), la quantité de gaz d'échappement recyclés est détectée et un signal correspondant est délivré au circuit électrique (6) et ce signal est compris dans le calcul de la teneur d'émission de NOx.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la concentration en oxygène est détectée et un signal correspondant est délivré au circuit électrique et en ce que ce signal est compris dans le calcul de la teneur d'émission de NOx.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la courbe de pression dans la chambre de combustion (11) est détectée dans chaque cylindre (2) et pour chaque cylindre(2), un calcul distinct de l'émission de NOx est effectué.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'un capteur de NOx détecte la proportion de NOx dans le flux des gaz d'échappement et une valeur de mesure correspondante est comparée à la teneur de l'émission de NOx calculée.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la vitesse du moteur à combustion interne est détectée et un signal correspondant est délivré au circuit électrique et en ce que ce signal est compris dans le calcul de la teneur d'émission de NOx.
EP01960712A 2000-09-02 2001-08-28 Procede de determination de la teneur en azote de gaz d'echappement azotes issus de moteurs thermiques Expired - Lifetime EP1313935B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10043383 2000-09-02
DE10043383A DE10043383C2 (de) 2000-09-02 2000-09-02 Verfahren zur Bestimmung des Stickoxidgehalts in sauerstoffhaltigen Abgasen von Brennkraftmaschinen
PCT/EP2001/009870 WO2002018762A1 (fr) 2000-09-02 2001-08-28 Procede de determination de la teneur en azote de gaz d'echappement azotes issus de moteurs thermiques

Publications (2)

Publication Number Publication Date
EP1313935A1 EP1313935A1 (fr) 2003-05-28
EP1313935B1 true EP1313935B1 (fr) 2006-10-11

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EP01960712A Expired - Lifetime EP1313935B1 (fr) 2000-09-02 2001-08-28 Procede de determination de la teneur en azote de gaz d'echappement azotes issus de moteurs thermiques

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US (1) US6826471B2 (fr)
EP (1) EP1313935B1 (fr)
JP (1) JP4008810B2 (fr)
DE (2) DE10043383C2 (fr)
WO (1) WO2002018762A1 (fr)

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DE10220320B3 (de) * 2002-05-07 2004-01-22 Daimlerchrysler Ag Verfahren zum Betreiben eines Verbrennungsmotors
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US6817171B2 (en) 2003-01-17 2004-11-16 Daimlerchrysler Corporation System and method for predicting concentration of undesirable exhaust emissions from an engine
DE10316113A1 (de) 2003-04-09 2004-10-28 Daimlerchrysler Ag Verfahren zum Betrieb einer Brennkraftmaschine mit Selbstzündung
DE10316112A1 (de) 2003-04-09 2004-10-28 Daimlerchrysler Ag Verfahren zum Betrieb einer Brennkraftmaschine mit Selbstzündung
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US10539058B2 (en) * 2015-08-05 2020-01-21 Cummins Emission Solutions Inc. Oxygen correction for engine-out NOx estimates using a NOx sensor of an aftertreatment system
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EP3336335B1 (fr) 2016-12-15 2021-01-27 Caterpillar Motoren GmbH & Co. KG Procédé de fonctionnement d'un moteur à combustion interne à combustible gazeux
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Publication number Publication date
DE10043383C2 (de) 2002-06-20
US6826471B2 (en) 2004-11-30
JP2004507652A (ja) 2004-03-11
JP4008810B2 (ja) 2007-11-14
WO2002018762A1 (fr) 2002-03-07
US20040050362A1 (en) 2004-03-18
DE10043383A1 (de) 2002-03-14
DE50111218D1 (de) 2006-11-23
EP1313935A1 (fr) 2003-05-28

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