EP1853807A1 - Procede d'ajustement, a regulation par tension, de la puissance du chauffage d'une sonde de gaz d'echappement - Google Patents

Procede d'ajustement, a regulation par tension, de la puissance du chauffage d'une sonde de gaz d'echappement

Info

Publication number
EP1853807A1
EP1853807A1 EP06707876A EP06707876A EP1853807A1 EP 1853807 A1 EP1853807 A1 EP 1853807A1 EP 06707876 A EP06707876 A EP 06707876A EP 06707876 A EP06707876 A EP 06707876A EP 1853807 A1 EP1853807 A1 EP 1853807A1
Authority
EP
European Patent Office
Prior art keywords
heating
voltage
probe
engine start
phase
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
Application number
EP06707876A
Other languages
German (de)
English (en)
Other versions
EP1853807B1 (fr
Inventor
Thomas Wahl
Walter Strassner
Lothar Diehl
Stefan Rodewald
Jürgen Sindel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1853807A1 publication Critical patent/EP1853807A1/fr
Application granted granted Critical
Publication of EP1853807B1 publication Critical patent/EP1853807B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F02D41/1493—Details
    • F02D41/1494—Control of sensor heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00

Definitions

  • one or more probes are arranged in the exhaust of the internal combustion engine, which typically determine the residual oxygen content of the exhaust gas based on this measurement can determine the Qualltat the combustion About a Control unit is this measurement signal, along with other characteristics such as speed, air flow or throttle angle, the fuel metering
  • the probe must have a sufficient operating temperature In the warm-up phase of the probe, for example, after engine start, the probe signal is therefore not available Until reaching a sufficient probe temperature, therefore, the fuel control is replaced by a fuel control Dies As a result, no optimal classification values are achieved during this time
  • Critical factors related to damage to the probe include strong temperature gradients within the probe which can lead to stress cracking due to the resulting differential thermal expansion of the probe body
  • the heater in the interior of the probe and is characterized by an Al 2 O 3 layer or an Al 2 ⁇ 3-Isolationsfohe from the sensor element isolated
  • the probe is heated from the inside out is chosen too high a heating rate , then the temperature gradient from the inside of the probe to the probe surface becomes so large that cracks can start from the probe surface under tension
  • the heating voltage when switching on as a ramp from a suitable starting voltage, for example from 10V to the full heating voltage, for example, 13V, controlled the ramp is only started when the dew point is exceeded in the exhaust system, otherwise on the Probe impinging moisture strongly cools the probe surface and thus leads to large temperature gradients with the described effects
  • the probe must not go through the entire temperature range from cold to operating temperature so after the engine start but is already preheated, whereby the heating ramp described can be passed through faster accordingly Nevertheless, the described disadvantage remains that the greatest mechanical stresses occur at the end of the ramp, what the maximum permissible rate of increase of the heating power is limited
  • the object relating to the method is achieved in that in the heating phase of the heating in an initial phase, the heating voltage very quickly with respect to a follow-up phase or abruptly to a high value, preferably the full operating voltage is brought and then the heating voltage is reduced continuously or quasi-continuously Prevents a too rapid rise in the temperature in the sensor element, the tensile stresses increase so much that it exceeds the strength of the ceramic and ruptures cracks in the sensor element surface
  • a preferred variant provides that the reduction of the heating voltage preferably takes place in steps between 0.1 V / s and 0.3 V / s. This results in lower tensile stresses in the surface because the maximum possible temperature difference between the surface and the interior of the lambda probe is lowered becomes
  • the invention has the advantage that the reduction takes place up to a predetermined constant value or until the probe heating is completely switched off
  • the ramp-shaped heating voltage is designed so that the resulting tensile stresses in the surface of the probe assume an approximately constant value over the heating phase, which is less than the mate ⁇ alspezifische strength of the surface mate ⁇ als the probe.
  • the invention provides that the application of the high heating voltage and the subsequent reduction of the heating voltage occurs with the engine start
  • the voltage conditions in the sensor element return to The resulting compressive stresses quickly heated heater environment produce only small tensile stresses on the sensor element surface
  • the sensor element can be warmed by the low heating capacity to around 200 0 C, it is provided that the probe already at a time lying in front of the engine start signal, preferably the opening of the driver's door or the insertion of the ignition key, is preheated
  • An embodiment provides that the preheating takes place at a low effective heating voltage, preferably at 2 V.
  • the preheating is selected so that excessive amounts of water can not lead to the destruction of the sensor element
  • a particularly simple embodiment provides that the preheating is carried out staggered. This has the advantage that the waiting time before the engine start is considerably shortened. It is provided that at a first time before the engine start lags signal a first heating power with a small fraction of the full Heating power and a second higher heating power is set with a larger fraction of the full heating power in a subsequent second before the engine start signal
  • An embodiment of the invention provides that after starting the engine, the heating power is reduced compared to the Einschaltiere This is then justified that as soon as the engine starts the risk of water transport in the exhaust system increases The voltage conditions reverse in the sensor element and the resulting compressive stresses thus generate small tensile stresses on the sensor element surface
  • Figure 1 is a Schurampe and a tensile stress curve according to the prior art Figure 2 an initially konzent ⁇ erte heating ramp and the associated Buchwoodsverlauf Figure 3 is a representation of the preheating and the Werners when inserting the ignition key
  • Figure 4 is an illustration of the further heating with the ignition switched on and the zugeho ⁇ ge course of the tensile stresses
  • Figure 5 is a representation of the reduction of heating power at engine start and tension curve Description of the embodiments
  • FIG. 1 illustrates a heating ramp according to the prior art. It can be seen that, when the heating voltage is switched on, it is raised from a suitable starting voltage (in this case 10 V) steadily to the full heating voltage available (here 13 V) then started when the dew point is exceeded in the exhaust system. otherwise possible moisture will strongly cool the surface of the probe and cracking may occur. As soon as the engine starts, the heating power is reduced again. This is done according to the prior art in that the target internal resistance of the Nernst cell indicates that the operating temperature has been reached. The voltage conditions in the sensor element are reversed and no tensile stresses are generated on the sensor element surface more
  • the tensile stress in MPa is indicated on the right side.
  • the course of the tensile stress shows that although the stress is reduced, at the same time a fast light - off is also possible
  • FIG. 2 shows an initial concentrated heating ramp which begins with full operating voltages.
  • the heating voltage is lowered at a satisfactory rate along a ramp.
  • the ramp is designed so that the simulated tensile stress in the surface of the sensor element is established as early as possible.
  • the tensile stress then remains constant at a value that results from the material-specific strength and a safety factor
  • the internal resistance of the Nernst cell is used to reach the operating temperature
  • the probe is clocked with a low effective heating voltage Daduich the sensor element heats up by the low heating voltage to about 200 0 C This temperature is corresponding to the Mate ⁇ alzusammen application chosen so that any amounts of water can not lead to a Zerstomng the sensor element
  • the tensile stresses behave similarly by the low heating and the tensile stresses rise only slightly When the engine is then started, the tensile stresses behave analogous to those in Figure 2
  • Figure 4 describes the further heating when switching on the ignition Since the ignition of the ignition announces the early engine start, is heated with increased heating power in still air If the engine is now started, the heater jumps to its maximum value and then regulates, According to the internal resistance of the Nernst cell, on the operating temperature and thus on the operating voltage The regulation follows again the previously described heating ramp Here, too, the tensile stresses increase slowly according to the different heat outputs, which has a positive effect on the life of the sensor element

Landscapes

  • 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)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé permettant d'ajuster, de manière régulée par la tension, la puissance d'un chauffage de sonde du système de gaz d'échappement d'un moteur à combustion interne. Pour un procédé de ce type où la température de service de la sonde doit être atteinte le plus rapidement possible, sans que la sonde s'en trouve altérée, il est prévu selon l'invention, qu'au cours de la période de montée en température du chauffage, dans une phase initiale, la tension de chauffage soit portée très rapidement à une valeur élevée, de préférence à la pleine tension de service, par rapport à une phase subséquente ou de manière discontinue, puis que la tension de chauffage soit réduite de manière continue ou quasi continue.
EP06707876.6A 2005-02-15 2006-01-27 Procede d'ajustement, a regulation par tension, de la puissance du chauffage d'une sonde de gaz d'echappement Active EP1853807B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005006760A DE102005006760A1 (de) 2005-02-15 2005-02-15 Verfahren zur spannungsgesteuerten Leistungseinstellung der Heizung einer Abgassonde
PCT/EP2006/050495 WO2006087261A1 (fr) 2005-02-15 2006-01-27 Procede d'ajustement, a regulation par tension, de la puissance du chauffage d'une sonde de gaz d'echappement

Publications (2)

Publication Number Publication Date
EP1853807A1 true EP1853807A1 (fr) 2007-11-14
EP1853807B1 EP1853807B1 (fr) 2014-01-08

Family

ID=36218695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06707876.6A Active EP1853807B1 (fr) 2005-02-15 2006-01-27 Procede d'ajustement, a regulation par tension, de la puissance du chauffage d'une sonde de gaz d'echappement

Country Status (6)

Country Link
US (1) US8240127B2 (fr)
EP (1) EP1853807B1 (fr)
JP (1) JP4825224B2 (fr)
KR (1) KR101092812B1 (fr)
DE (1) DE102005006760A1 (fr)
WO (1) WO2006087261A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7536999B2 (en) * 2007-01-12 2009-05-26 Nissan Motor Co., Ltd. Air-fuel ratio control apparatus
DE102007035188B4 (de) * 2007-07-27 2009-12-24 Continental Automotive Gmbh Verfahren zum Aufheizen eines Gassensors
JP4819838B2 (ja) * 2007-08-23 2011-11-24 日本特殊陶業株式会社 ガスセンサ制御装置
DE102008038583B4 (de) 2007-08-23 2024-02-08 Ngk Spark Plug Co., Ltd. Gassensorsteuervorrichtung mit zwei Widerstandssollwerten zur Verkürzung der Aktivierungszeit des Gassensorelements
DE102008013515A1 (de) * 2008-03-07 2009-09-10 Volkswagen Ag Verfahren zum Betreiben einer Lambdasonde während der Aufwärmphase
US8438899B2 (en) * 2009-09-02 2013-05-14 Ford Global Technologies, Llc Method for evaluating degradation of a particulate matter sensor
DE102009055041B4 (de) 2009-12-21 2021-12-09 Robert Bosch Gmbh Verfahren zum schnellen Erreichen der Betriebsbereitschaft einer beheizbaren Abgassonde
DE102010038153B3 (de) 2010-10-13 2012-03-08 Ford Global Technologies, Llc. Partikelsensor, Abgassystem und Verfahren zum Schutz von Komponenten eines turbogeladenen Motors mit Abgasrückführung
US8490476B2 (en) 2011-03-08 2013-07-23 Ford Global Technologies, Llc Method for diagnosing operation of a particulate matter sensor
DE102012203401A1 (de) 2012-03-05 2013-09-05 Volkswagen Aktiengesellschaft Verfahren zur Steuerung einer Heizeinrichtung zur Beheizung eines Bauteils, Steuervorrichtung sowie Kraftfahrzeug mit einer solchen
US9797849B2 (en) * 2013-03-29 2017-10-24 Rosemount Analytical Inc. Method of operation an in SITU process probe
DE102016209075A1 (de) * 2016-05-25 2017-06-08 Continental Automotive Gmbh Gassensor mit Leistungsbegrenzung

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
DE2805805C2 (de) 1978-02-11 1989-07-20 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Einrichtung zum Betrieb einer Kraftstoffversorgungsanlage mit Lambda-Regelung
DE4019067A1 (de) 1990-06-15 1991-12-19 Bosch Gmbh Robert Einrichtung zum einschalten einer abgassondenheizung
JP3104362B2 (ja) * 1992-01-27 2000-10-30 株式会社デンソー 内燃機関の空燃比制御装置
JP3487009B2 (ja) * 1994-08-05 2004-01-13 株式会社デンソー 酸素センサのヒータ制御装置
JP3436611B2 (ja) * 1995-04-28 2003-08-11 日本特殊陶業株式会社 酸素センサ用ヒータの通電制御方法及び装置
US6099717A (en) * 1996-11-06 2000-08-08 Ngk Spark Plug Co., Ltd. Method of and apparatus for detecting a deteriorated condition of a wide range air-fuel ratio sensor
JP3385893B2 (ja) * 1997-02-21 2003-03-10 トヨタ自動車株式会社 内燃機関用空燃比センサのヒータ制御装置
EP2163889A1 (fr) * 1999-02-03 2010-03-17 Denso Corporation Dispositif de mesure de la concentration d'un gaz avec compensation d'erreurs du signal de sortie
JP2002004934A (ja) * 2000-06-22 2002-01-09 Unisia Jecs Corp 空燃比センサのヒータ制御装置
JP3800068B2 (ja) * 2000-12-27 2006-07-19 株式会社デンソー ガス濃度センサのヒータ制御装置
JP4344486B2 (ja) * 2001-03-09 2009-10-14 日本碍子株式会社 ガスセンサ
JP4110874B2 (ja) * 2002-08-09 2008-07-02 株式会社デンソー 内燃機関のガスセンサの加熱制御装置
JP3824984B2 (ja) * 2002-09-06 2006-09-20 三菱電機株式会社 排気ガスセンサの温度制御装置
JP4093919B2 (ja) 2003-06-03 2008-06-04 株式会社日立製作所 ヒータ付き排気ガスセンサを備えた内燃機関の制御装置

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Also Published As

Publication number Publication date
JP2008530542A (ja) 2008-08-07
DE102005006760A1 (de) 2006-08-17
EP1853807B1 (fr) 2014-01-08
KR101092812B1 (ko) 2011-12-12
WO2006087261A1 (fr) 2006-08-24
US8240127B2 (en) 2012-08-14
KR20070110851A (ko) 2007-11-20
US20080087005A1 (en) 2008-04-17
JP4825224B2 (ja) 2011-11-30

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