WO2002070884A1 - Automotive vehicle - Google Patents

Automotive vehicle Download PDF

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Publication number
WO2002070884A1
WO2002070884A1 PCT/NL2002/000101 NL0200101W WO02070884A1 WO 2002070884 A1 WO2002070884 A1 WO 2002070884A1 NL 0200101 W NL0200101 W NL 0200101W WO 02070884 A1 WO02070884 A1 WO 02070884A1
Authority
WO
WIPO (PCT)
Prior art keywords
catalyst
control loop
combustion engine
model
lambda sensor
Prior art date
Application number
PCT/NL2002/000101
Other languages
French (fr)
Inventor
Mario Balenovic
Johannes Maria Antonius Harmsen
Antonius Cornelius Petrus Maria Backx
Jozef Henricus Bernardus Johannes Hoebink
Jacob Cornelis Schouten
Original Assignee
Stichting Voor De Technische Wetenschappen
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 Stichting Voor De Technische Wetenschappen filed Critical Stichting Voor De Technische Wetenschappen
Publication of WO2002070884A1 publication Critical patent/WO2002070884A1/en

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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1402—Adaptive control

Definitions

  • the invention relates to an automotive vehicle provided with a combustion engine equipped for the conversion of fossil fuel into driving energy for the vehicle, and to an exhaust system coupled to the combustion engine, comprising a catalyst for converting environmentally harmful gas components into environmentally acceptable gas components, wherein the combustion engine at the outlet side is provided with a first lambda sensor for measuring an air/gas ratio, and at the inlet side is provided with a fuel control, and wherein the fuel control, the combustion engine and the first lambda sensor form a closed control loop, in which first control loop an optional estimation model of the combustion engine is included.
  • Such an automotive vehicle is known in practice. At a constant driving performance, the known vehicle affords an optimal conversion of harmful components in the exhaust gases but not of the less harmful components .
  • the above mentioned optional application of an estimation model of the combustion engine is used. With this estimation model a preliminary regulation may be realised, making it possible to an- ticipate the expected composition of the exhaust gases when the vehicle accelerates or decelerates .
  • the automotive vehicle according to the invention is characterized in that a second control loop is present with a catalyst controller that controls the first control loop and which second control loop is further formed by the catalyst connected to the first control loop, and by a second lambda sensor provided at the outlet side of the catalyst, which second control loop is equipped to regulate an amount of oxygen stored in the catalyst .
  • the second control loop includes a catalyst model for estimating the amount of oxygen stored in the catalyst. This provides a means for determining the amount of oxygen in the catalyst. This is especially desirable because it is difficult to measure the amount of oxygen in the catalyst directly.
  • the amount of oxygen estimated by the catalyst model to be stored in the catalyst is fed to the catalyst controller as feedback signal. In this way, it is possible with very simple means to online regulate the amount of oxygen in the catalyst, and it is not necessary to base the regulation on a previously determined database with variables relating to the catalyst and which are indicative for the oxygen level in the catalyst .
  • the catalyst model is embodied to be adaptive by using a third control loop for adapting previously determined parameters from the catalyst model.
  • a third control loop for adapting previously determined parameters from the catalyst model.
  • the adaptation of the catalyst may preferably be regulated by the third control loop adjusting the previously determined parameters of the catalyst model subject to a discrepancy between a measured value of the air/gas ratio at the outlet side of the catalyst determined by the second lambda sensor, and an air/gas ratio at the outlet side of the catalyst estimated by the catalyst model .
  • Fig. 1 shows a control diagram as used in an automotive vehicle according to the prior art
  • Fig. 2 shows a control diagram as used in an automotive vehicle according to the invention.
  • a schematic illustration of the known control system is shown.
  • a combustion engine 1 of the vehicle is included and in the exhaust system connected to the combustion engine 1 a lambda sensor 2 as well as a catalyst 3 are provided.
  • the first control loop shown in this Fig. 1 is directed at maintaining a stoichiometric combustion in the combustion engine 1. Any possible deviations in the stoichiometric ratio are adjusted by the fuel control 4 by adapting the amount of fuel supplied to the combustion engine 1.
  • the control loop used in this prior art is thus formed by the fuel control 4, the combustion engine 1 and the lambda sensor 2.
  • an estimation model 5 of the combustion engine 1 may be included in this control loop.
  • FIG. 2 shows that there is also a second control loop, which includes a catalyst controller 6 controlling the first control loop 1, 2, 4 and 5 and which is further formed by the catalyst 3 and a second lambda sensor 7 provided at the outlet side of the catalyst 3 and connected to the first control loop 1, 2, 4 and 5.
  • This second control loop is equipped for regulating an amount of oxygen stored in the catalyst 3.
  • Fig. 2 further shows that the second control loop comprises a catalyst model 8 for estimating the amount of oxygen stored in the catalyst 3.
  • the catalyst model 8 is adaptive due to the use of a third control loop.
  • This third control loop serves to adapt previously determined parameters from the catalyst model 8. To this end the lambda value present at the outlet side of the catalyst 3 determined with the estimated value of the catalyst model 8 is compared with the actual value measured with the aid of lambda sensor 7. Possible deviations are used to adjust the parameters of the cata- lyst model 8.
  • Fig. 2 further shows that an amount of oxygen in the catalyst 3, which amount was estimated by the catalyst model 8, is used as feedback signal in the second control loop of which the catalyst controller 6 is a component .

Abstract

The invention relates to an automotive vehicle provided with a combustion engine equipped for the conversion of fossil fuel into driving energy for the vehicle, and to an exhaust system coupled to the combustion engine, comprising a catalyst for converting environmentally harmful gas components into environmentally acceptable gas components, wherein the combustion engine at the outlet side is provided with a first lambda sensor for measuring an air/gas ratio, and at the inlet side is provided with a fuel control, and wherein the fuel control, the combustion engine and the first lambda sensor form a closed control loop, in which first control loop an optional estimation model of the combustion engine is included, wherein a second control loop is present with a catalyst controller that controls the first control loop and that is further formed by the catalyst connected to the first control loop, and by a second lambda sensor provided at the outlet side of the catalyst, which second control loop is equipped to regulate an amount of oxygen stored in the catalyst.

Description

Automotive vehicle
The invention relates to an automotive vehicle provided with a combustion engine equipped for the conversion of fossil fuel into driving energy for the vehicle, and to an exhaust system coupled to the combustion engine, comprising a catalyst for converting environmentally harmful gas components into environmentally acceptable gas components, wherein the combustion engine at the outlet side is provided with a first lambda sensor for measuring an air/gas ratio, and at the inlet side is provided with a fuel control, and wherein the fuel control, the combustion engine and the first lambda sensor form a closed control loop, in which first control loop an optional estimation model of the combustion engine is included.
Such an automotive vehicle is known in practice. At a constant driving performance, the known vehicle affords an optimal conversion of harmful components in the exhaust gases but not of the less harmful components . In order to achieve an optimal conversion of harmful components into harmless ones even during the change- able driving performance, that is to say during acceleration and deceleration of the vehicle, the above mentioned optional application of an estimation model of the combustion engine is used. With this estimation model a preliminary regulation may be realised, making it possible to an- ticipate the expected composition of the exhaust gases when the vehicle accelerates or decelerates .
Nevertheless, the problem is that in practice satisfactory control is not possible under all conditions, a particular problem being that the catalyst ages and the conversion of harmful gas components to harmless gas components becomes less optimal, and apparently also depends on the actual operational conditions of the catalyst .
It is the object of the invention to improve the dynamic performance of the vehicle's catalyst in order to render the operability of the catalyst more resistant to changeable operating conditions and ageing.
To this end, the automotive vehicle according to the invention is characterized in that a second control loop is present with a catalyst controller that controls the first control loop and which second control loop is further formed by the catalyst connected to the first control loop, and by a second lambda sensor provided at the outlet side of the catalyst, which second control loop is equipped to regulate an amount of oxygen stored in the catalyst .
Surprisingly, the regulation of the amount of oxygen present in the catalyst was shown to improve the catalyst's activity. This advantage was realised even un- der dynamic working conditions of the catalyst, that is to say at considerably changeable driving performances, and in situations demanding great and variable working power. It is an advantage that the second control loop includes a catalyst model for estimating the amount of oxygen stored in the catalyst. This provides a means for determining the amount of oxygen in the catalyst. This is especially desirable because it is difficult to measure the amount of oxygen in the catalyst directly. Preferably, the amount of oxygen estimated by the catalyst model to be stored in the catalyst is fed to the catalyst controller as feedback signal. In this way, it is possible with very simple means to online regulate the amount of oxygen in the catalyst, and it is not necessary to base the regulation on a previously determined database with variables relating to the catalyst and which are indicative for the oxygen level in the catalyst .
In another aspect of the invention, the catalyst model is embodied to be adaptive by using a third control loop for adapting previously determined parameters from the catalyst model. Such an adaptive catalyst model allows the simple adaptation of the model to the present changing catalyst performances, so that the consequences of, for example the catalyst's ageing, can be taken into account in the regulation. The adaptation of the catalyst may preferably be regulated by the third control loop adjusting the previously determined parameters of the catalyst model subject to a discrepancy between a measured value of the air/gas ratio at the outlet side of the catalyst determined by the second lambda sensor, and an air/gas ratio at the outlet side of the catalyst estimated by the catalyst model .
The invention will now be further elucidated with reference to a non-limiting exemplary embodiment of the device according to the invention.
Those components of the invention with which the person skilled in the art is acquainted are not shown in the example; the illustration of the invention is based on its essence. To this end the invention is elucidated with reference to the drawing, which:
- in Fig. 1 shows a control diagram as used in an automotive vehicle according to the prior art; and
- in Fig. 2 shows a control diagram as used in an automotive vehicle according to the invention.
Identical reference numbers or indications in the Figures refer to identical parts.
Referring first to Fig 1, a schematic illustration of the known control system is shown. In this control system a combustion engine 1 of the vehicle is included and in the exhaust system connected to the combustion engine 1 a lambda sensor 2 as well as a catalyst 3 are provided. The first control loop shown in this Fig. 1 is directed at maintaining a stoichiometric combustion in the combustion engine 1. Any possible deviations in the stoichiometric ratio are adjusted by the fuel control 4 by adapting the amount of fuel supplied to the combustion engine 1. The control loop used in this prior art is thus formed by the fuel control 4, the combustion engine 1 and the lambda sensor 2. If desired, an estimation model 5 of the combustion engine 1 may be included in this control loop. With this estimation model 5 a preliminary regulation of the amount of fuel supplied to the combustion engine 1 may be realised, subject to the anticipated changes in the air/gas ratio at the outlet side. This affords advantages especially during acceleration and deceleration of the vehicle, during which the combustion engine 1 is subjected to a changeable load, due to which it is not possible to keep the stoichiometric combustion constant. Referring now to Fig. 2, in which the control diagram of the device according to the invention is shown, attention is first drawn to the previously- discussed control loop of the prior art, which forms an inner control loop in the regulation according to the invention. Fig. 2 shows that there is also a second control loop, which includes a catalyst controller 6 controlling the first control loop 1, 2, 4 and 5 and which is further formed by the catalyst 3 and a second lambda sensor 7 provided at the outlet side of the catalyst 3 and connected to the first control loop 1, 2, 4 and 5. This second control loop is equipped for regulating an amount of oxygen stored in the catalyst 3.
Fig. 2 further shows that the second control loop comprises a catalyst model 8 for estimating the amount of oxygen stored in the catalyst 3. In addition, Fig. 2 shows that the catalyst model 8 is adaptive due to the use of a third control loop. This third control loop serves to adapt previously determined parameters from the catalyst model 8. To this end the lambda value present at the outlet side of the catalyst 3 determined with the estimated value of the catalyst model 8 is compared with the actual value measured with the aid of lambda sensor 7. Possible deviations are used to adjust the parameters of the cata- lyst model 8.
Fig. 2 further shows that an amount of oxygen in the catalyst 3, which amount was estimated by the catalyst model 8, is used as feedback signal in the second control loop of which the catalyst controller 6 is a component .

Claims

1. An automotive vehicle provided with a combustion engine equipped for the conversion of fossil fuel into driving energy for the vehicle, and to an exhaust system coupled to the combustion engine, comprising a catalyst for converting environmentally harmful gas components into environmentally acceptable gas components, wherein the combustion engine at the outlet side is provided with a first lambda sensor for measuring an air/gas ratio, and at the inlet side is provided with a fuel con- trol, and wherein the fuel control, the combustion engine and the first lambda sensor form a closed control loop, in which first control loop an optional estimation model of the combustion engine is included characterized in that a second control loop is present with a catalyst controller that controls the first control loop and which second control loop is further formed by the catalyst connected to the first control loop, and by a second lambda sensor provided at the outlet side of the catalyst, which second control loop is equipped to regulate an amount of oxygen stored in the catalyst.
2. An automotive vehicle according to claim 1, characterized in that the second control loop includes a catalyst model for estimating the amount of oxygen stored in the catalyst .
3. An automotive vehicle according to claim 2, characterized in that the catalyst model is adaptive by using a third control loop for adapting previously determined parameters from the catalyst model .
4. An automotive vehicle according to claim 3 , characterized in that the third control loop adjusts the previously determined parameters of the catalyst model subject to a discrepancy between a measured value of the air/gas ratio at the outlet side of the catalyst determined by the second lambda sensor, and an air/gas ratio at the outlet side of the catalyst estimated by the catalyst model .
5. An automotive vehicle according to one of the claims 2-4, characterized in that the amount of oxygen estimated by the catalyst model to be stored in the catalyst is fed to the catalyst controller as feedback signal .
PCT/NL2002/000101 2001-03-02 2002-02-18 Automotive vehicle WO2002070884A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1017481 2001-03-02
NL1017481A NL1017481C2 (en) 2001-03-02 2001-03-02 Autonomous mobile vehicle.

Publications (1)

Publication Number Publication Date
WO2002070884A1 true WO2002070884A1 (en) 2002-09-12

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PCT/NL2002/000101 WO2002070884A1 (en) 2001-03-02 2002-02-18 Automotive vehicle

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WO (1) WO2002070884A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1681448A1 (en) * 2004-12-16 2006-07-19 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Method and system for the control of an internal combustion engine with a three-way catalyst
WO2007033769A1 (en) * 2005-09-19 2007-03-29 Volkswagen Lambda controller with balancing of the quantity of oxygen
EP3885542A4 (en) * 2019-03-20 2022-08-24 Hitachi Astemo, Ltd. Internal combustion engine control device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293740A (en) * 1991-08-29 1994-03-15 Robert Bosch Gmbh Method and arrangement for controlling the quantity of fuel for an internal combustion engine having a catalytic converter
WO1998038416A1 (en) * 1997-02-26 1998-09-03 Motorola Inc. Method for controlling the level of oxygen stored by a catalyst within a catalytic converter
US5901552A (en) * 1996-02-23 1999-05-11 Robert Bosch Gmbh Method of adjusting the air/fuel ratio for an internal combustion engine having a catalytic converter
JP2000008921A (en) * 1998-06-17 2000-01-11 Unisia Jecs Corp Oxygen storage quantity control device for three-way catalyst
EP0982488A1 (en) * 1998-08-25 2000-03-01 MAGNETI MARELLI S.p.A. Method for controlling the strength of the air/fuel mixture supplied to an internal-combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293740A (en) * 1991-08-29 1994-03-15 Robert Bosch Gmbh Method and arrangement for controlling the quantity of fuel for an internal combustion engine having a catalytic converter
US5901552A (en) * 1996-02-23 1999-05-11 Robert Bosch Gmbh Method of adjusting the air/fuel ratio for an internal combustion engine having a catalytic converter
WO1998038416A1 (en) * 1997-02-26 1998-09-03 Motorola Inc. Method for controlling the level of oxygen stored by a catalyst within a catalytic converter
JP2000008921A (en) * 1998-06-17 2000-01-11 Unisia Jecs Corp Oxygen storage quantity control device for three-way catalyst
EP0982488A1 (en) * 1998-08-25 2000-03-01 MAGNETI MARELLI S.p.A. Method for controlling the strength of the air/fuel mixture supplied to an internal-combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1681448A1 (en) * 2004-12-16 2006-07-19 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Method and system for the control of an internal combustion engine with a three-way catalyst
WO2007033769A1 (en) * 2005-09-19 2007-03-29 Volkswagen Lambda controller with balancing of the quantity of oxygen
US8020370B2 (en) 2005-09-19 2011-09-20 Volkswagen Ag Lambda controller with balancing of the quantity of oxygen
EP3885542A4 (en) * 2019-03-20 2022-08-24 Hitachi Astemo, Ltd. Internal combustion engine control device
US11795889B2 (en) 2019-03-20 2023-10-24 Hitachi Astemo, Ltd. Internal combustion engine control device

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