EP0877159B1 - Procédé de comtrôle du fonctionnement du chauffage de la sonde lambda dans l'échappement d'un moteur à combustion - Google Patents

Procédé de comtrôle du fonctionnement du chauffage de la sonde lambda dans l'échappement d'un moteur à combustion Download PDF

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Publication number
EP0877159B1
EP0877159B1 EP98106013A EP98106013A EP0877159B1 EP 0877159 B1 EP0877159 B1 EP 0877159B1 EP 98106013 A EP98106013 A EP 98106013A EP 98106013 A EP98106013 A EP 98106013A EP 0877159 B1 EP0877159 B1 EP 0877159B1
Authority
EP
European Patent Office
Prior art keywords
heater
heating
resistor
current
internal combustion
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
Application number
EP98106013A
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German (de)
English (en)
Other versions
EP0877159A2 (fr
EP0877159A3 (fr
Inventor
Thomas Seidenfuss
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0877159A2 publication Critical patent/EP0877159A2/fr
Publication of EP0877159A3 publication Critical patent/EP0877159A3/fr
Application granted granted Critical
Publication of EP0877159B1 publication Critical patent/EP0877159B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system

Definitions

  • the invention relates to a method for checking the functionality the electrical heating of a lambda sensor in the exhaust pipe Internal combustion engine according to the preamble of patent claim 1.
  • the oxygen content of the exhaust gas is measured with a lambda probe determined and the value determined in this way fed to a control device, which serves to set a predetermined air / fuel ratio.
  • the lambda probe is only operational above a minimum operating temperature.
  • the regulation of the air / fuel mixture by means of Lambda probe only possible when the lambda probe has reached its operating temperature has reached. Only then can one be low
  • Optimal air / fuel mixture can be regulated.
  • the operating temperature of the Lambda probe is heated by a electric heating accelerates. In terms of low pollutant emissions it is therefore necessary for the operability of the lambda probe heater to check. It is known that aging of the electrical resistance of such a heater changes with time.
  • the temperature-dependent electrical resistance of the lambda probe heating is therefore measured in the known method according to DE 41 32 008 A1 when a predetermined operating temperature is reached.
  • a device is used, for example, which is also shown schematically in FIG. 3.
  • the lambda probe heater is connected in the form of a heating resistor R L between the drain electrode of a field effect transistor T1 (or the collector of a bipolar transistor) and the positive pole of a battery.
  • the source electrode of the field effect transistor T1 (or the emitter of a bipolar transistor) is connected via a measuring resistor R measurement to the negative pole of the battery or to ground.
  • a control output of the microprocessor is connected to the control electrode of the field effect transistor T1 (or to the base of a bipolar transistor).
  • the microprocessor ⁇ P has other inputs and outputs for controlling different functions.
  • the source electrode of transistor T1 (or the emitter of a bipolar transistor) is connected via a resistor R2 or via an operational amplifier to the input of an A / D converter, the output of which leads to an input of the microprocessor ⁇ P.
  • the heating resistor R L is energized by means of the battery voltage U + when the heating resistor R L is connected to the battery B via a relay R and the microprocessor .mu.P connects transistor T1 to ground by actuating the control electrode.
  • the resistor R L can also be connected directly to the battery B, saving the relay R.
  • the heating resistor of the lambda sensor heater at ambient temperatures is very low compared to the operating temperature, flows when switched on the lambda sensor heater a very high current.
  • the measuring resistor dimensioned such that a sufficient at operating temperature accurate measurement is possible during the warm-up phase of the lambda probe a high power is converted into heat in the measuring resistor.
  • Control devices e.g. B. engine control units
  • this problem either with a large measuring resistor or by reduction the performance is solved by clocking the heating current.
  • large measuring resistance requires a large printed circuit board area and is relatively expensive. Reducing performance through Clocking in turn undesirably extends the time period to one Lambda control is possible.
  • the electrical resistance of the heater is measured when the heating current is switched off.
  • the heating is with a Measuring current applied, which is smaller than the heating current. This resistance measurement is preferably carried out if the Lamda probe has reached its operating temperature.
  • the heating is different to the prior art according to DE 41 32 008 A1, in which the Heating for the application of (heating) current is switched to ground, for the application of (measuring or heating) current against positive voltage connected.
  • the power loss in the resistance measurement avoided because the heating resistor is not during the Heating current is measured, but in the switched off state.
  • a resistor R1 by means of which a measuring current I M is predetermined, is connected in parallel to the transistor T1.
  • the heating is switched off in a first step, ie the transistor T1 is blocked, so that heating current I H can no longer flow.
  • the relay R is closed, only a small measuring current I M flows through the resistor R1, which is also applied to the probe heater or its heating resistor R L.
  • the microprocessor ⁇ P calculates the value of the heating resistor R L from the voltage drop U measured over the heating resistor R L , the known value of the resistor R1 and the battery voltage U +.
  • the measurement of the heating resistance R L can also be carried out at any other probe temperature or also in the cold state, ie in the unheated state. Since there is a known relationship between the probe temperature or the temperature of the heating resistor and the ohmic value of the heating resistor, on the one hand the measured heating resistance can be used to draw conclusions about the current probe temperature, but on the other hand it can compare the measured value with an expected value of the heating resistor if the probe temperature is known become. If the difference between these values exceeds a certain threshold value, it is concluded that there is an error. To monitor the correct functionality of the heating, a predetermined course of the ohmic values of the heating resistor over a certain period of time can also be compared with an actually determined course.
  • one connection of the lambda probe heater or the heating resistor R L is connected firmly to ground, while the other connection can be switched against the battery voltage U +.
  • a diode D1 connected to ground between the resistor R2 and the A / D converter limits the voltage at the A / D converter input when the heating is switched on. If the resistor R2 is selected to have a very high resistance and at the same time the A / D converter input is sufficiently protected internally, the diode D1 can also be omitted.
  • the main relay R usually present in motor vehicles ensures that the measuring current is switched off when the vehicle is parked.
  • FIG. 2 shows an alternative with respect to FIG. 1 in that the resistor R1 extra with a measuring voltage of 5 V instead of the battery voltage U + is applied.
  • the voltage of 5 V is usually the supply voltage a control device of a control device.
  • the 5 V voltage is the reference for the A / D converter, which makes the Voltage measurement of the battery voltage U + can be omitted.
  • 1 to 3 are usually in internal combustion engine control units integrated, which also regulates an optimal Make air / fuel mixture.
  • the exemplary embodiments according to the invention make it possible to dispense with low-resistance measuring resistors (R measurement ) with high power.
  • R measurement low-resistance measuring resistors
  • a 1% SMD standard resistor of the 1206 design can be used. This reduces costs and saves space on the circuit board, especially when considering the fact that several lambda probes often have to be switched per control unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Claims (2)

  1. Procédé pour contrôler du fonctionnement du circuit électrique d'une sonde lambda dans l'échappement d'un moteur à combustion interne, selon lequel on mesure la résistance électrique du chauffage,
    caractérisé en ce que
    la mesure de la résistance électrique (RL) du chauffage a lieu quand le courant du chauffage (IH) est coupé, et le chauffage, pour mesurer sa résistance électrique (RL), est alimenté par un courant de mesure (IM = U+/R1) qui est inférieur au courant de chauffage (IH).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la résistance électrique (RL) du chauffage, pour être alimentée par le courant de chauffage ou de mesure (IM, IH), est reliée à la tension positive (U+).
EP98106013A 1997-05-07 1998-04-02 Procédé de comtrôle du fonctionnement du chauffage de la sonde lambda dans l'échappement d'un moteur à combustion Expired - Lifetime EP0877159B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19719390A DE19719390A1 (de) 1997-05-07 1997-05-07 Verfahren zur Überprüfung der Funktionsfähigkeit der elektrischen Heizung einer Lambda-Sonde im Abgasrohr einer Brennkraftmaschine
DE19719390 1997-05-07

Publications (3)

Publication Number Publication Date
EP0877159A2 EP0877159A2 (fr) 1998-11-11
EP0877159A3 EP0877159A3 (fr) 1999-12-29
EP0877159B1 true EP0877159B1 (fr) 2003-06-25

Family

ID=7828955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98106013A Expired - Lifetime EP0877159B1 (fr) 1997-05-07 1998-04-02 Procédé de comtrôle du fonctionnement du chauffage de la sonde lambda dans l'échappement d'un moteur à combustion

Country Status (5)

Country Link
US (1) US5929328A (fr)
EP (1) EP0877159B1 (fr)
JP (1) JPH1183790A (fr)
DE (2) DE19719390A1 (fr)
ES (1) ES2202676T3 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19956823C2 (de) * 1999-11-25 2002-11-28 Siemens Ag Ansteuerschaltung und Ansteuerverfahren für einen Gassensor
US7481915B2 (en) * 2001-02-08 2009-01-27 Ford Global Technologies, Llc Exhaust gas temperature measurement utilizing an exhaust gas sensor
US6586711B2 (en) * 2001-07-27 2003-07-01 General Motors Corporation Current control method for an oxygen sensor heater
DE102006014681A1 (de) * 2006-03-28 2007-10-04 Robert Bosch Gmbh Gassensor
CN102854393B (zh) * 2012-09-08 2014-12-24 无锡隆盛科技股份有限公司 氮氧传感器加热检测电路及加热检测方法
DE102015222554A1 (de) 2015-11-16 2017-05-18 Inficon Gmbh Lecksuche mit Sauerstoff
DE102016202854A1 (de) * 2016-02-24 2017-08-24 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zum Betreiben einer Lambdasonde in einem Abgaskanal einer Brennkraftmaschine
US10563605B2 (en) * 2018-03-13 2020-02-18 Ford Global Technologies, Llc Systems and methods for reducing vehicle emissions
US11092101B2 (en) 2018-08-22 2021-08-17 Rosemount Aerospace Inc. Heater in-circuit capacitive measurement
US11078859B2 (en) * 2019-10-11 2021-08-03 Fca Us Llc Oxygen sensor out of specification heater rationality monitor using cold start cycle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07122627B2 (ja) * 1987-12-16 1995-12-25 日本電装株式会社 酸素濃度センサ用ヒータの制御装置
US4993392A (en) * 1989-04-24 1991-02-19 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling heater for heating oxygen sensor
DE3941995A1 (de) * 1989-12-20 1991-06-27 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberwachung der funktionsfaehigkeit einer sonden-heizeinrichtung
DE4132008C2 (de) * 1991-09-26 2000-04-06 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überprüfung der Funktionsfähigkeit einer Heizung einer Sauerstoffsonde
US5245979A (en) * 1992-10-28 1993-09-21 Ford Motor Company Oxygen sensor system with a dynamic heater malfunction detector
US5454259A (en) * 1993-08-02 1995-10-03 Toyota Jidosha Kabushiki Kaisha Failure detecting apparatus in temperature controller of air-fuel ratio sensor
US5392643A (en) * 1993-11-22 1995-02-28 Chrysler Corporation Oxygen heater sensor diagnostic routine
DE4344961B4 (de) * 1993-12-30 2004-05-06 Robert Bosch Gmbh Auswertevorrichtung für das Signal einer Sauerstoffsonde
JP3711582B2 (ja) * 1995-03-31 2005-11-02 株式会社デンソー 酸素濃度検出装置

Also Published As

Publication number Publication date
DE19719390A1 (de) 1998-11-12
EP0877159A2 (fr) 1998-11-11
US5929328A (en) 1999-07-27
ES2202676T3 (es) 2004-04-01
DE59808786D1 (de) 2003-07-31
EP0877159A3 (fr) 1999-12-29
JPH1183790A (ja) 1999-03-26

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