EP0005613A2 - Circuit sensible à la température pour sonde de détection d'oxygène pendant la période de chauffage - Google Patents

Circuit sensible à la température pour sonde de détection d'oxygène pendant la période de chauffage Download PDF

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Publication number
EP0005613A2
EP0005613A2 EP79300803A EP79300803A EP0005613A2 EP 0005613 A2 EP0005613 A2 EP 0005613A2 EP 79300803 A EP79300803 A EP 79300803A EP 79300803 A EP79300803 A EP 79300803A EP 0005613 A2 EP0005613 A2 EP 0005613A2
Authority
EP
European Patent Office
Prior art keywords
engine
warm
composite circuit
sensor
oxygen sensor
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.)
Withdrawn
Application number
EP79300803A
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German (de)
English (en)
Other versions
EP0005613A3 (fr
Inventor
Emile David Long
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.)
Allied Corp
Original Assignee
Allied Corp
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 Allied Corp filed Critical Allied Corp
Publication of EP0005613A2 publication Critical patent/EP0005613A2/fr
Publication of EP0005613A3 publication Critical patent/EP0005613A3/fr
Withdrawn legal-status Critical Current

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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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1479—Using a comparator with variable reference

Definitions

  • A/F air-fuel ratio
  • the degree of control required depends on the particular devices with which the engine is equipped. For example, it has been determined that for three-way catalyst devices presently used to reduce exhaust emissions of hydrocarbons, carbon monoxide and oxides of nitrogen, air-fuel should be controlled within about one percent. Less accurate control of air-fuel ratio decreases catalyst efficiency, and may even destroy the catalyst. Achievement of accuracies on the order of magnitude of one percent is a daunting task, but appears possible with electronic regulation of fuel flow rate, using an oxygen sensor in the exhaust stream. Such a sensor may be constructed from zirconium oxide. Its output is a strong function of air-fuel, provided the air-fuel mixture used is nearly stoichiometric.
  • a major difficulty arising with the use of such an oxygen sensor is that its output voltage also depends on temperature.
  • the difficulty is most severe during warm-up of the engine, when the exhaust temperature may vary from about 600°F (316°C) to about l100°F (593°C).
  • Accurate control of exhaust emissions is especially important during the warm-up process, when emissions of hydrocarbons and carbon monoxide tend to be much higher than usual.
  • the present invention provides a composite circuit means associated with an electronic fuel injection system for a vehicle engine having an electronic circuit that determines fuel flow rate.
  • Such composite circuit is adapted to provide a reference voltage with which the output voltage of an oxygen sensor is compared during periods of time required for engine warm-up and engine operation after warm-up has been completed.
  • the composite circuit includes a first means having a resistance element carrying a temperature dependent'resistance-value and positioned relative in a location to be exposed to temperatures analogous to the operating temperatures of the oxygen sensor, for providing a reference voltage during the warm-up period of the engine.
  • a second means including a constant voltage source provides the reference voltage after the engine warm-up period has been completed.
  • the output voltage of the oxygen sensor is contrasted with the reference voltage by a comparison means, which generates a correction signal proportional to the difference between the reference and oxygen sensor voltages.
  • a correction means applies the correction signal to the electronic circuit determining fuel flow rate.
  • the composite circuit means, shown generally at 10 is associated with controller 12 of an electronic circuit that determines fuel flow rate to a vehicle engine (not shown).
  • Composite circuit 10 provides a reference voltage V r with which the output voltage V o of an exhaust sensor is compared during periods of time required for (1) engine warm-up and (2) engine operation after warm-up has been completed.
  • the composite circuit 10 includes a first means having a resistance element T carrying a temperature dependent resistance value and positioned in a location to be exposed to temperatures analogous to the operating temperature of the oxygen sensor. Resistance element T provides a reference voltage V r during warm-up of the engine.
  • a second means including a constant voltage source Z provides the reference voltage V after the engine warm-up period has been completed.
  • the output voltage V o of the oxygen sensor is contrasted with the reference voltage V by a comparison means, which generates a correction signal 14 proportional to the difference between the reference and oxygen sensor voltages V and V o2 .
  • a correction means 16 applies the correction signal 14 to the controller 12, determining fuel flow rate.
  • Resistance element T is located in the engine coolant, or in any other location representative of engine temperature. Alternatively, the resistance element T may be located directly on or in the oxygen sensor, or in any position representative of the temperature of the exhaust gas.
  • the voltage V across Zener'diode Z is constant to a very high accuracy, even if there are fluctuations in the supply voltage A+.
  • a voltage divider R 1/ R 2 allows setting the circuit output voltage V o R 1 /(R 1 +R 2 ) equal to the reference value V required for a warm engine.
  • the reference signal V is provided by the resistance element T.
  • the resistance Rt of the thermistor, and hence the voltage V t varries in accordance with the temperature t of the oxygen sensor.
  • a shunt resistance R 4 may be used to change the dependence of voltage V t on oxygen sensor temperature t.
  • Resistance R 3 serves to limit the current to the Zener diode.
  • the resistance R 1 is adjusted to provide the reference signal V r required for a warm engine.
  • the reference signal V r is compared with the output signal Vo2 from the oxygen sensor, and the error signal is used to correct the fuel flow rate, as shown schematically in Figure 4.
  • the oxygen sensor is a zirconium oxide sensor having an output voltage of the type shown in Figures 1 and 2.
  • the Zener diode is a silicon diode type SZ 4.7, having a breakdown voltage V of 4.7 volt, nominal.
  • the A+ voltage is 14 volt nominal such as that supplied by a vehicle generator and battery.
  • the resistance R 3 is typically about 180 ohm.
  • the resistance element T is preferably a FENWALL #JA4IWI having a resistance R t that varies as a functionn of temperatures t in the manner indicated by Table I in Figure 5.
  • the resistance R 4 can be omitted; the resistance R 5 are 10 kiloohm, nominal.
  • the rectifier D is a germanium diode, type 1N277.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP79300803A 1978-05-15 1979-05-10 Circuit sensible à la température pour sonde de détection d'oxygène pendant la période de chauffage Withdrawn EP0005613A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90590578A 1978-05-15 1978-05-15
US905905 1978-05-15

Publications (2)

Publication Number Publication Date
EP0005613A2 true EP0005613A2 (fr) 1979-11-28
EP0005613A3 EP0005613A3 (fr) 1979-12-12

Family

ID=25421667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79300803A Withdrawn EP0005613A3 (fr) 1978-05-15 1979-05-10 Circuit sensible à la température pour sonde de détection d'oxygène pendant la période de chauffage

Country Status (2)

Country Link
EP (1) EP0005613A3 (fr)
JP (1) JPS54150520A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0136519A2 (fr) * 1983-08-24 1985-04-10 Hitachi, Ltd. Appareil de commande du rapport air/carburant pour moteurs à combustion interne
WO1991009219A1 (fr) * 1989-12-20 1991-06-27 Robert Bosch Gmbh Procede et dispositif pour la surveillance du bon fonctionnement d'un dispositif de chauffage de sonde
WO1994015085A1 (fr) * 1992-12-21 1994-07-07 Ford Motor Company Limited Systeme de detecteur d'oxygene a correction du signal
EP0731266A1 (fr) * 1995-03-10 1996-09-11 Ford Motor Company Commande de limitation d'émissions de gaz d'échappement d'un moteur à combustion interne
US9234476B2 (en) 2014-04-14 2016-01-12 Ford Global Technologies, Llc Methods and systems for determining a fuel concentration in engine oil using an intake oxygen sensor
US9322367B2 (en) 2014-01-14 2016-04-26 Ford Global Technologies, Llc Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor
US9328684B2 (en) 2013-09-19 2016-05-03 Ford Global Technologies, Llc Methods and systems for an intake oxygen sensor
US9441564B2 (en) 2014-04-14 2016-09-13 Ford Global Technologies, Llc Methods and systems for adjusting EGR based on an impact of PCV hydrocarbons on an intake oxygen sensor
US9482189B2 (en) 2013-09-19 2016-11-01 Ford Global Technologies, Llc Methods and systems for an intake oxygen sensor
US9957906B2 (en) 2013-11-06 2018-05-01 Ford Gloabl Technologies, LLC Methods and systems for PCV flow estimation with an intake oxygen sensor

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2035177A1 (fr) * 1969-03-22 1970-12-18 Philips Nv
FR2135996A5 (fr) * 1971-04-02 1972-12-22 Bosch Gmbh Robert
FR2163267A5 (fr) * 1972-01-20 1973-07-20 Bendix Corp
FR2216016A1 (fr) * 1973-01-31 1974-08-30 Bosch Gmbh Robert
DE2333743A1 (de) * 1973-07-03 1975-01-30 Bosch Gmbh Robert Verfahren und vorrichtung zur abgasentgiftung von brennkraftmaschinen
FR2241071A1 (fr) * 1973-08-16 1975-03-14 Bosch Gmbh Robert
GB1426569A (en) * 1973-05-02 1976-03-03 Jac Inc Temperature responsive device
FR2318315A1 (fr) * 1975-07-14 1977-02-11 Bendix Corp Systeme de controle de normalisation du rapport air/combustible pour systeme d'injection de combustible a boucle fermee pour moteur a combustion interne
DE2649606A1 (de) * 1975-11-01 1977-05-12 Nissan Motor Verfahren und vorrichtung zum katalytischen entfernen von schaedlichen bestandteilen aus auspuffgasen einer brennkraftmaschine
DE2658613A1 (de) * 1975-12-25 1977-07-07 Nissan Motor Regelvorrichtung fuer das luft-brennstoff-verhaeltnis eines einer brennkraftmaschine zugefuehrten gemisches
FR2346563A1 (fr) * 1974-09-30 1977-10-28 Bendix Corp Systeme de detection de fonctionnement pour sonde de detection de gaz

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2035177A1 (fr) * 1969-03-22 1970-12-18 Philips Nv
FR2135996A5 (fr) * 1971-04-02 1972-12-22 Bosch Gmbh Robert
FR2163267A5 (fr) * 1972-01-20 1973-07-20 Bendix Corp
FR2216016A1 (fr) * 1973-01-31 1974-08-30 Bosch Gmbh Robert
GB1426569A (en) * 1973-05-02 1976-03-03 Jac Inc Temperature responsive device
DE2333743A1 (de) * 1973-07-03 1975-01-30 Bosch Gmbh Robert Verfahren und vorrichtung zur abgasentgiftung von brennkraftmaschinen
FR2241071A1 (fr) * 1973-08-16 1975-03-14 Bosch Gmbh Robert
FR2346563A1 (fr) * 1974-09-30 1977-10-28 Bendix Corp Systeme de detection de fonctionnement pour sonde de detection de gaz
FR2318315A1 (fr) * 1975-07-14 1977-02-11 Bendix Corp Systeme de controle de normalisation du rapport air/combustible pour systeme d'injection de combustible a boucle fermee pour moteur a combustion interne
DE2649606A1 (de) * 1975-11-01 1977-05-12 Nissan Motor Verfahren und vorrichtung zum katalytischen entfernen von schaedlichen bestandteilen aus auspuffgasen einer brennkraftmaschine
DE2658613A1 (de) * 1975-12-25 1977-07-07 Nissan Motor Regelvorrichtung fuer das luft-brennstoff-verhaeltnis eines einer brennkraftmaschine zugefuehrten gemisches

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0136519A2 (fr) * 1983-08-24 1985-04-10 Hitachi, Ltd. Appareil de commande du rapport air/carburant pour moteurs à combustion interne
EP0136519A3 (en) * 1983-08-24 1985-12-18 Hitachi, Ltd. Air-fuel ratio control apparatus for internal combustion engines
WO1991009219A1 (fr) * 1989-12-20 1991-06-27 Robert Bosch Gmbh Procede et dispositif pour la surveillance du bon fonctionnement d'un dispositif de chauffage de sonde
US5285762A (en) * 1989-12-20 1994-02-15 Robert Bosch Gmbh Method and arrangement for monitoring the operability of a probe heating device
WO1994015085A1 (fr) * 1992-12-21 1994-07-07 Ford Motor Company Limited Systeme de detecteur d'oxygene a correction du signal
EP0731266A1 (fr) * 1995-03-10 1996-09-11 Ford Motor Company Commande de limitation d'émissions de gaz d'échappement d'un moteur à combustion interne
US9328684B2 (en) 2013-09-19 2016-05-03 Ford Global Technologies, Llc Methods and systems for an intake oxygen sensor
US9482189B2 (en) 2013-09-19 2016-11-01 Ford Global Technologies, Llc Methods and systems for an intake oxygen sensor
US9664133B2 (en) 2013-09-19 2017-05-30 Ford Global Technologies, Llc Methods and systems for an intake oxygen sensor
US9957906B2 (en) 2013-11-06 2018-05-01 Ford Gloabl Technologies, LLC Methods and systems for PCV flow estimation with an intake oxygen sensor
US9322367B2 (en) 2014-01-14 2016-04-26 Ford Global Technologies, Llc Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor
US9234476B2 (en) 2014-04-14 2016-01-12 Ford Global Technologies, Llc Methods and systems for determining a fuel concentration in engine oil using an intake oxygen sensor
US9366197B2 (en) 2014-04-14 2016-06-14 Ford Global Technologies, Llc Methods and systems for determining a fuel concentration in engine oil using an intake oxygen sensor
US9441564B2 (en) 2014-04-14 2016-09-13 Ford Global Technologies, Llc Methods and systems for adjusting EGR based on an impact of PCV hydrocarbons on an intake oxygen sensor
US9897027B2 (en) 2014-04-14 2018-02-20 Ford Global Technologies, Llc Methods and systems for adjusting EGR based on an impact of PCV hydrocarbons on an intake oxygen sensor
RU2670566C2 (ru) * 2014-04-14 2018-10-23 ФОРД ГЛОУБАЛ ТЕКНОЛОДЖИЗ, ЭлЭлСи Способы и система управления двигателем

Also Published As

Publication number Publication date
JPS54150520A (en) 1979-11-26
EP0005613A3 (fr) 1979-12-12

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Inventor name: LONG, EMILE DAVID