CN1222768C - Calibrating NOx-sensor - Google Patents

Calibrating NOx-sensor Download PDF

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Publication number
CN1222768C
CN1222768C CN 00805013 CN00805013A CN1222768C CN 1222768 C CN1222768 C CN 1222768C CN 00805013 CN00805013 CN 00805013 CN 00805013 A CN00805013 A CN 00805013A CN 1222768 C CN1222768 C CN 1222768C
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CN
China
Prior art keywords
nox
sensor
catalytic converter
storage catalytic
calibration
Prior art date
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Expired - Fee Related
Application number
CN 00805013
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Chinese (zh)
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CN1343309A (en
Inventor
M·戴茨
H·哈恩
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Volkswagen AG
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Volkswagen AG
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Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of CN1343309A publication Critical patent/CN1343309A/en
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Publication of CN1222768C publication Critical patent/CN1222768C/en
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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
    • F02D41/24—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
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2474—Characteristics of 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
    • F02D41/1438—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
    • 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
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/4175—Calibrating or checking the analyser

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for determining the concentration of NOx in the flow of exhaust gas of an internal combustion engine using a NOx sensor, whereby the sensor is calibrated using selected operating points. Preferably, exactly one selected motor operating point is used.

Description

Measure the NO of engine exhaust gas stream xThe method of concentration and a kind of internal combustion engine
This method relates to the NOx content by means of a NOx sensor determination waste gas, relates in particular to a kind of like this calibration and method of operating of NOx sensor.
As everyone knows, the NOx sensor of measuring the NOx content in the engine exhaust gas has various forms, this is not needed be described further.Observe the emission limit value of NOx for the internal combustion engine that makes lean burn, must know the NOx content in the waste gas stream behind the NOx storage catalytic converter, so that can for example determine no longer may be in the NOx storer moment of deposit NOx, that is to say, this moment, the NOx storer was filled, so that a regeneration stage must be arranged.
For this reason, usually in the waste gas stream of the internal combustion engine of part-time lean burn at least, be provided with a catalytic converter, the measurement mechanism of NOx concentration, for example a NOx sensor in energy measurement waste gas in addition this catalytic converter after.In addition, this system also has the internal combustion engine control module that can handle the NOx signal that records.
The pointing accuracy of present commercially available NOx sensor is not quite similar to the index error of the actual value of its NOx concentration of different manufacturers.Characteristic these unique inexactnesies of used sensor can cause the error of internal combustion engine control module control performance, for example, thereby cause accurately learning the compactedness of NOx storer, and then it is too late that regeneration is connected, this can cause environmental pollution to increase.
By EP-A-0 878 709 known a kind of sensors that are used for measuring waste gas stream NOx concentration, wherein this sensor has two measuring chambers, NOx concentration is determined by the NOx in the waste gas decomposition stream, wherein must calibrate the skew of sensor, so that acquisition is to the reliable explanation of NOx concentration.When using this sensor in an engine exhaust gas stream that is provided with a NOx storage catalytic converter, the calibration of sensor is the working point of adopting known NOx concentration.This working point was produced by the flame-out stage.Because sensor is to NH 3Cross sensitivity, this calibration can not be carried out in the NOx of the automobilism storage catalytic converter regeneration stage, because produce NH in regeneration stage of NOx storage catalytic converter 3
Task of the present invention provides a kind of method of the NOx of mensuration concentration, even wherein the calibration of NOx sensor offset also can be carried out when NOx storage catalytic converter breaks down or poisons.
This task is solved by the feature of independent claims 1.The preferred embodiments of the invention are themes of dependent claims.
The preferred embodiments of the invention below are described with reference to the accompanying drawings.
Figure 1 shows that the principle schematic of the fuel system of lean burn.
Figure 2 shows that the synoptic diagram of sensor characteristic curve.
Fig. 1 illustrates the fuel system of lean burn schematically.Internal combustion engine 1 by the lean burn of engine management system 2 control is provided with a selectable pre-catalytic converter 4 and the catalytic converter 5 with NOx memory function in its waste gas stream 3.Exhaust gas flow direction after catalytic converter 5 is provided with a NOx sensor or Lan Muda sensor (Lambda-Sensor) 6, and the NOx concentration of this sensor measurement waste gas also is transferred to engine management system 2 with its measuring-signal by lead 7.
As mentioned above, the NOx sensor 6 that can buy at present has different family curves, according to different manufacturers, with the actual value of NOx different error amounts is arranged.Characteristic these errors of sensor 6 have more reason at least in the range of linearity, they can distinguished aspect the gradient (sensitivity) of skew 8 precision and precision 9.
Figure 2 shows that the family curve of a NOx sensor.The sensor output signal OUT of any unit is the function representation of the NOx concentration that quantizes with ppm.Family curve in the essential scope internal linear has skew 8 (coordinate intercept) and gradients 9.
For to small part compensating offset error, can consider a working point (at least one working point) of engine 1, on this working point, can suppose to have the catalytic converter 5 NOx concentration afterwards of enough accuracy.Revise by known NOx concentration by the NOx signal that sensor 6 records.
When catalytic converter 5 relates to a kind of NOx storage catalytic converter, preferably adopt following working point to calibrate: in a certain temperature range of catalytic converter 5, for example about 350 ℃, even for badly damaged or a poison catalytic converter 5, at least in sometime, 5～10 seconds after for example carrying out a NOx regeneration in advance when engine 1 idle running are because the mass flow of NOx is low, so almost 100% NOx concentration deposits in the catalytic converter 5.Therefore the actual value of the NOx concentration after catalytic converter 5 is between 0/1000000th～5.Like this, this characteristic skew that constantly just can advantageously be used for calibrating NOx sensor 6.

Claims (6)

1. measure the method for the NOx concentration of internal combustion engine (1) waste gas stream by means of a NOx sensor (6), wherein sensor (6) is arranged on a NOx storage catalytic converter (5) afterwards and by the calibration of selected working point, it is characterized in that, the calibration of sensor (6) is that certain hour carries out at interval after the once pre-regeneration of NOx storage catalytic converter and then, this moment NOx concentration actual value between 0 to 5ppm.
2. according to the method for claim 1, it is characterized in that calibration is to carry out in the idling of IC engine process.
3. according to the method for claim 1 or 2, it is characterized in that the described time interval is 5 to 10 seconds kinds.
4. according to the method for claim 1, it is characterized in that the temperature of NOx storage catalytic converter is in predetermined scope.
5. according to the method for claim 4, it is characterized in that the temperature of NOx storage catalytic converter is 350 ℃.
6. have the internal combustion engine (1) of the lean burn of a catalytic converter (5) that is arranged in waste gas stream (3) and a NOx sensor (6) and a control unit of engine (2), employing is corrected the skew of sensor (6) according to the method for one of aforementioned claim.
CN 00805013 1999-03-16 2000-02-28 Calibrating NOx-sensor Expired - Fee Related CN1222768C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19911664.4 1999-03-16
DE1999111664 DE19911664A1 (en) 1999-03-16 1999-03-16 Calibration of a NOx sensor

Publications (2)

Publication Number Publication Date
CN1343309A CN1343309A (en) 2002-04-03
CN1222768C true CN1222768C (en) 2005-10-12

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CN 00805013 Expired - Fee Related CN1222768C (en) 1999-03-16 2000-02-28 Calibrating NOx-sensor

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EP (1) EP1163510A1 (en)
JP (1) JP4535357B2 (en)
CN (1) CN1222768C (en)
DE (1) DE19911664A1 (en)
WO (1) WO2000055614A1 (en)

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DE10023072B4 (en) * 2000-05-11 2013-07-04 Volkswagen Ag Method and device for determining a NOx concentration of an exhaust gas stream of an internal combustion engine
WO2002082067A2 (en) * 2001-04-05 2002-10-17 Robert Bosch Gmbh Gas sensor, in particular lambda-probe
FR2849112B1 (en) * 2002-12-18 2005-02-04 Renault Sa METHOD FOR CONTROLLING COMPONENT ELEMENT COMPONENTS OF INTERNAL COMBUSTION ENGINE
DE10309422B4 (en) * 2003-03-05 2016-09-29 Volkswagen Ag Method and device for calibrating a NOx sensor
DE102004051747A1 (en) * 2004-10-23 2006-04-27 Robert Bosch Gmbh Internal-combustion engine operation comprises determining nitrogen oxide concentration, fill level, and operating temperature of the nitrogen oxide accumulator catalyst and correcting a signal off set
JP2008542619A (en) * 2005-05-31 2008-11-27 ボーグワーナー・インコーポレーテッド Actuator control method
FR2891871B1 (en) * 2005-10-10 2007-12-14 Renault Sas SYSTEM AND METHOD FOR REDUCING DISPERSION OF EMISSION OF AN ELEMENT IN AN EXHAUST GAS
US7900614B2 (en) * 2008-05-22 2011-03-08 Ford Global Technologies, Llc Self-calibrating NOx sensor
JP4692911B2 (en) * 2008-09-18 2011-06-01 トヨタ自動車株式会社 NOx sensor output calibration apparatus and output calibration method
CN101509433B (en) * 2008-12-25 2012-11-21 联合汽车电子有限公司 Oxygen sensor deterioration emulator control deviation calibrating method based on lambda closed-loop control
SE535748C2 (en) * 2010-04-08 2012-12-04 Scania Cv Ab Apparatus and method for detecting a state of a NOx sensor of a motor vehicle
US8930121B2 (en) 2011-04-07 2015-01-06 GM Global Technology Operations LLC Offset and slow response diagnostic methods for NOx sensors in vehicle exhaust treatment applications
DE102013209487B4 (en) * 2013-05-22 2020-07-02 Mtu Friedrichshafen Gmbh Method for operating a drive device and corresponding drive device
JP6256240B2 (en) * 2014-07-28 2018-01-10 トヨタ自動車株式会社 Control device for internal combustion engine
JP6398789B2 (en) * 2015-02-27 2018-10-03 いすゞ自動車株式会社 Diagnostic equipment
CN110702849A (en) * 2018-07-09 2020-01-17 卓品智能科技无锡有限公司 Self-learning correction method for vehicle-mounted nitrogen-oxygen sensor detection value

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Publication number Publication date
DE19911664A1 (en) 2000-09-21
WO2000055614A1 (en) 2000-09-21
JP2002539448A (en) 2002-11-19
EP1163510A1 (en) 2001-12-19
CN1343309A (en) 2002-04-03
JP4535357B2 (en) 2010-09-01

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