WO1999035379A1 - Temperature monitoring of an exhaust system having a cooling loop, for internal combustion engines - Google Patents

Temperature monitoring of an exhaust system having a cooling loop, for internal combustion engines Download PDF

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Publication number
WO1999035379A1
WO1999035379A1 PCT/IB1999/000010 IB9900010W WO9935379A1 WO 1999035379 A1 WO1999035379 A1 WO 1999035379A1 IB 9900010 W IB9900010 W IB 9900010W WO 9935379 A1 WO9935379 A1 WO 9935379A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
internal combustion
temperature monitoring
intended value
exhaust system
Prior art date
Application number
PCT/IB1999/000010
Other languages
French (fr)
Inventor
Guido Dickers
Klemens Grieser
Johann Himmelsbach
Patrick Phlips
Original Assignee
Ford Global Technologies, Inc.
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 Ford Global Technologies, Inc. filed Critical Ford Global Technologies, Inc.
Publication of WO1999035379A1 publication Critical patent/WO1999035379A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2046—Periodically cooling catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to the temperature monitoring of an exhaust system having a cooling loop in a motor vehicle, particularly one with a front-mounted internal combustion engine wherein the exhaust gases are passed through a catalytic converter and a nitrogen oxide trap to the rear region of the vehicle, the exhaust gas lines of the individual cylinders being combined on one side of the internal combustion engine in a manifold from which two supply lines of different cross-section lead to the catalytic converter and the larger cross-section supply line can be shut off by means of a shut-off valve.
  • the pipes supplying the exhaust gases to the converter are of different lengths.
  • the larger cross-section supply pipe is arranged beneath the internal combustion engine in front of the engine (in the direction of travel of the vehicle) and underneath the engine. It includes a bend, after which the exhaust pipe runs counter to the direction of travel to the catalytic converter mounted underneath the passenger compartment.
  • the smaller cross-section pipe forms a short connection between a region of the manifold near a decoupling element and a region of the exhaust gas line adjacent to the converter.
  • the larger cross-section connecting pipe lies in a region of the vehicle in which optimum cooling is possible.
  • the object of the invention is to provide monitoring of this functioning without the need for additional outlay on sensors .
  • the invention provides a method of monitoring the temperature of an exhaust system having a cooling loop, for internal combustion engines, wherein a catalytic converter and a nitrogen oxide trap are fitted in the exhaust system and the cooling area is controllable by a shut-off valve, wherein at specified operating conditions of the internal combustion engine the shut-off valve is adjusted to a predetermined value and at least one temperature in the exhaust gas train is measured and is compared with an intended value
  • an operating condition is defined which, with the shut-off valve in the selected position, would result in a predetermined intended value at the temperature measuring point.
  • the magnitude of this intended value can be determined in advance by tests and stored in the corresponding control unit together with the operating conditions of the internal combustion engine.
  • the temperature at the nitrogen oxide trap is determined and compared with an upper limiting value.
  • the temperature at the outlet of the catalytic converter is determined as well as the temperature at the nitrogen oxide trap, and both temperatures are compared with intended values.
  • the double temperature determination increases the reliability of the temperature monitoring.
  • from the variation of the two temperature signals with time conclusions can be drawn about the cooling function of the cooling loop and about the functioning of the shut-off valve .
  • a difference value is formed from the temperature at the outlet of the catalytic converter and the temperature at the nitrogen oxide trap and is compared with an initial intended value. This may be done at specific times determined by the operating conditions of the engine, or a difference function may be continuously formed from the said temperatures and compared with an intended value function.
  • the sensitivity of the temperature monitoring is thereby improved.
  • one of the above-mentioned intended values is fixed adaptively having regard to the engine speed the engine load the vehicle speed the ambient temperature - the air/fuel ratio or any desired combination thereof.
  • the temperature monitoring can not only be used to give a warning to the driver of any malfunction, but is also preferably used as a precaution against overheating of the converter and/or of the nitrogen oxide trap.
  • a preferred application of the temperature monitoring is therefore to influence the mixture setting so as to enrich the mixture if the intended value is exceeded.
  • the temperature monitoring can be used to influence the quantity of intake air by influencing the control of the electronic throttle valve if the intended value is exceeded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Method of monitoring the temperature of an exhaust system having a cooling loop, for internal combustion engines, wherein a catalytic converter and a nitrogen oxide trap are fitted in the exhaust system and the cooling surface is controllable by a shut-off valve, characterised in that at specified operating conditions of the internal combustion engine the shut-off valve is adjusted to a predetermined value and at least one temperature in the exhaust train is measured and is compared with an intended value.

Description

TEMPERATURE MONITORING OF .AN EXHAUST SYSTEM
HAVING A COOLING LOOP,
FOR INTERNAL COMBUSTION ENGINES
The invention relates to the temperature monitoring of an exhaust system having a cooling loop in a motor vehicle, particularly one with a front-mounted internal combustion engine wherein the exhaust gases are passed through a catalytic converter and a nitrogen oxide trap to the rear region of the vehicle, the exhaust gas lines of the individual cylinders being combined on one side of the internal combustion engine in a manifold from which two supply lines of different cross-section lead to the catalytic converter and the larger cross-section supply line can be shut off by means of a shut-off valve.
To ensure rapid heating up of the catalytic converter after a start-up of the internal combustion engine while still providing the necessary cooling for the pipe supplying the exhaust gases to the catalytic converter during prolonged operation of the vehicle, the pipes supplying the exhaust gases to the converter are of different lengths. The larger cross-section supply pipe is arranged beneath the internal combustion engine in front of the engine (in the direction of travel of the vehicle) and underneath the engine. It includes a bend, after which the exhaust pipe runs counter to the direction of travel to the catalytic converter mounted underneath the passenger compartment. The smaller cross-section pipe forms a short connection between a region of the manifold near a decoupling element and a region of the exhaust gas line adjacent to the converter.
This arrangement provides a positive solution to the problem of the so-called packaging of the exhaust gas pipes and the catalytic converter within the vehicle: the larger cross-section connecting pipe lies in a region of the vehicle in which optimum cooling is possible. Despite this, on starting up the vehicle shutting off the larger cross- section pipe enables rapid heating up of the catalytic converter to be effected by the smaller cross-section supply pipe, which in addition can be made shorter.
Both the rapid heating up of the catalytic converter and the cooling of the exhaust gas during the further operation of the vehicle depend on the cooling loop and the shut-off valve functioning properly.
The object of the invention is to provide monitoring of this functioning without the need for additional outlay on sensors .
To this end, the invention provides a method of monitoring the temperature of an exhaust system having a cooling loop, for internal combustion engines, wherein a catalytic converter and a nitrogen oxide trap are fitted in the exhaust system and the cooling area is controllable by a shut-off valve, wherein at specified operating conditions of the internal combustion engine the shut-off valve is adjusted to a predetermined value and at least one temperature in the exhaust gas train is measured and is compared with an intended value
As the specified operating conditions of the internal combustion engine an operating condition is defined which, with the shut-off valve in the selected position, would result in a predetermined intended value at the temperature measuring point. The magnitude of this intended value can be determined in advance by tests and stored in the corresponding control unit together with the operating conditions of the internal combustion engine.
In particular, at full load operation of the internal combustion engine and with the shut-off valve completely open the temperature at the nitrogen oxide trap is determined and compared with an upper limiting value.
According to a preferred embodiment the temperature at the outlet of the catalytic converter is determined as well as the temperature at the nitrogen oxide trap, and both temperatures are compared with intended values.
The double temperature determination increases the reliability of the temperature monitoring. In particular, from the variation of the two temperature signals with time conclusions can be drawn about the cooling function of the cooling loop and about the functioning of the shut-off valve .
According to a further preferred embodiment of the temperature monitoring process a difference value is formed from the temperature at the outlet of the catalytic converter and the temperature at the nitrogen oxide trap and is compared with an initial intended value. This may be done at specific times determined by the operating conditions of the engine, or a difference function may be continuously formed from the said temperatures and compared with an intended value function.
The sensitivity of the temperature monitoring is thereby improved.
It is further preferable for one of the above-mentioned intended values to be fixed adaptively having regard to the engine speed the engine load the vehicle speed the ambient temperature - the air/fuel ratio or any desired combination thereof. By having regard to the variables affecting the exhaust gas temperature by means of an adaptation of the intended value the reliability of the temperature monitoring is improved.
The temperature monitoring can not only be used to give a warning to the driver of any malfunction, but is also preferably used as a precaution against overheating of the converter and/or of the nitrogen oxide trap.
A preferred application of the temperature monitoring is therefore to influence the mixture setting so as to enrich the mixture if the intended value is exceeded.
Alternatively or in addition the temperature monitoring can be used to influence the quantity of intake air by influencing the control of the electronic throttle valve if the intended value is exceeded.
Both for the enrichment of the mixture and for the influencing of the throttle valve position the deviation from the intended value can be used as a controlled variable .

Claims

1. Method of monitoring the temperature of an exhaust system having a cooling loop, for internal combustion engines, wherein a catalytic converter and a nitrogen oxide trap are fitted in the exhaust system and the cooling area is controllable by a shut-off valve, characterised in that at specified operating conditions of the internal combustion engine the shut-off valve is adjusted to a predetermined value and at least one temperature in the exhaust gas train is measured and is compared with an intended value.
2. Temperature monitoring method according to claim
1, characterised in that the temperature at the outlet of the catalytic converter and the temperature at the nitrogen oxide trap are determined and compared with intended values .
3. Temperature monitoring method according to claim
2, characterised in that a difference function is continuously formed from the said temperatures and is compared with an intended value function.
4. Temperature monitoring method according to claim
3, characterised in that at specific times determined by the operating conditions of the internal combustion engine a difference is formed from the temperatures and is compared with an intended value.
5. Temperature monitoring method according to any of claims 1-4, characterised in that the intended value is fixed adaptively having regard to the engine speed the engine load the vehicle speed - the ambient temperature the air/fuel ratio or a desired combination thereof. to any preceding claim for influencing the mixture setting, characterised in that if the intended value is exceeded the mixture is enriched.
7. Use of the temperature monitoring method according to any preceding claim to influence the quantity of intake air, characterised in that if the intended value is exceeded the position of the electronic throttle valve is influenced.
PCT/IB1999/000010 1998-01-09 1999-01-06 Temperature monitoring of an exhaust system having a cooling loop, for internal combustion engines WO1999035379A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98100275A EP0937869B1 (en) 1998-01-09 1998-01-09 Temperature monitoring of an exhaust apparatus with cooling loop for combustion engines
EP98100275.1 1998-01-09

Publications (1)

Publication Number Publication Date
WO1999035379A1 true WO1999035379A1 (en) 1999-07-15

Family

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Family Applications (1)

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PCT/IB1999/000010 WO1999035379A1 (en) 1998-01-09 1999-01-06 Temperature monitoring of an exhaust system having a cooling loop, for internal combustion engines

Country Status (3)

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EP (1) EP0937869B1 (en)
DE (1) DE59800219D1 (en)
WO (1) WO1999035379A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829179A1 (en) * 2001-09-05 2003-03-07 Peugeot Citroen Automobiles Sa MOTOR VEHICLE EXHAUST LINE AND HEAT EXCHANGER USED ON THE EXHAUST LINE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10031924A1 (en) 2000-06-30 2002-01-10 Bosch Gmbh Robert Effectiveness checking method for heating catalytic converter in internal combustion engine, involves evaluating heating measure based on comparison result of catalytic converter temperature with predetermined value

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050935A (en) * 1961-01-05 1962-08-28 Socony Mobil Oil Co Inc Apparatus for catalytically treating internal combustion engine exhaust gases
JPH0544454A (en) * 1991-08-17 1993-02-23 Mitsubishi Heavy Ind Ltd Exhaust of internal combustion engine
DE19522165A1 (en) * 1994-06-17 1995-12-21 Mitsubishi Motors Corp Absorption-estimating regulator for exhaust gas catalytic converter
JPH09209746A (en) * 1996-02-07 1997-08-12 Toyota Motor Corp Emission control device for internal combustion engine
DE19628796C1 (en) * 1996-07-17 1997-10-23 Daimler Benz Ag System for removal of nitrogen oxide(s), carbon mon:oxide, etc. from engine exhaust gases

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050935A (en) * 1961-01-05 1962-08-28 Socony Mobil Oil Co Inc Apparatus for catalytically treating internal combustion engine exhaust gases
JPH0544454A (en) * 1991-08-17 1993-02-23 Mitsubishi Heavy Ind Ltd Exhaust of internal combustion engine
DE19522165A1 (en) * 1994-06-17 1995-12-21 Mitsubishi Motors Corp Absorption-estimating regulator for exhaust gas catalytic converter
JPH09209746A (en) * 1996-02-07 1997-08-12 Toyota Motor Corp Emission control device for internal combustion engine
DE19628796C1 (en) * 1996-07-17 1997-10-23 Daimler Benz Ag System for removal of nitrogen oxide(s), carbon mon:oxide, etc. from engine exhaust gases

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 346 (M - 1437) 30 June 1993 (1993-06-30) *
PATENT ABSTRACTS OF JAPAN vol. 097, no. 012 25 December 1997 (1997-12-25) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829179A1 (en) * 2001-09-05 2003-03-07 Peugeot Citroen Automobiles Sa MOTOR VEHICLE EXHAUST LINE AND HEAT EXCHANGER USED ON THE EXHAUST LINE
EP1291497A1 (en) * 2001-09-05 2003-03-12 Peugeot Citroen Automobiles SA Motor vehicle exhaust line and heat exchanger used in the exhaust line

Also Published As

Publication number Publication date
EP0937869B1 (en) 2000-08-02
EP0937869A1 (en) 1999-08-25
DE59800219D1 (en) 2000-09-07

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