DE102009050067A1 - Exhaust gas after treatment system for motor vehicle, has two sensors for detection of measurement values and control device by which functional unit is controllable depending on evaluated measurement values - Google Patents
Exhaust gas after treatment system for motor vehicle, has two sensors for detection of measurement values and control device by which functional unit is controllable depending on evaluated measurement values Download PDFInfo
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- DE102009050067A1 DE102009050067A1 DE102009050067A DE102009050067A DE102009050067A1 DE 102009050067 A1 DE102009050067 A1 DE 102009050067A1 DE 102009050067 A DE102009050067 A DE 102009050067A DE 102009050067 A DE102009050067 A DE 102009050067A DE 102009050067 A1 DE102009050067 A1 DE 102009050067A1
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- sensors
- control device
- measured values
- exhaust gas
- measurement values
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Classifications
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- 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
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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
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/281—Interface circuits between sensors and control unit
- F02D2041/285—Interface circuits between sensors and control unit the sensor having a signal processing unit external to the engine control unit
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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
- F02D41/1439—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
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
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- 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
Abstract
Description
Die Erfindung betrifft ein Abgasnachbehandlungssystem für ein Kraftfahrzeug, mit wenigstens zwei Sensoren zum Erfassen eines jeweiligen Messwerts, und mit wenigstens einer Steuereinrichtung, mittels welcher in Abhängigkeit von den ausgewerteten Messwerten eine Funktionseinheit zum Beeinflussen des Abgases ansteuerbar ist. Des Weiteren betrifft die Erfindung ein Verfahren zum Betreiben eines solchen Abgasnachbehandlungssystems.The invention relates to an exhaust aftertreatment system for a motor vehicle, having at least two sensors for detecting a respective measured value, and having at least one control device, by means of which a functional unit for influencing the exhaust gas can be controlled as a function of the evaluated measured values. Furthermore, the invention relates to a method for operating such an exhaust aftertreatment system.
Die
Als nachteilig bei einem derartigen Abgasnachbehandlungssystem ist der Umstand anzusehen, dass es hierbei zu Ungenauigkeiten bei der Auswertung der Messwerte kommen kann.A disadvantage of such an exhaust aftertreatment system is the fact that in this case inaccuracies in the evaluation of the measured values can occur.
Aufgabe der vorliegenden Erfindung ist es daher, ein besonders zuverlässiges Abgasnachbehandlungssystem der eingangs genannten Art und ein entsprechendes Verfahren zum Betreiben eines Abgasnachbehandlungssystems zu schaffen.Object of the present invention is therefore to provide a particularly reliable exhaust aftertreatment system of the type mentioned above and a corresponding method for operating an exhaust aftertreatment system.
Diese Aufgabe wird durch ein Abgasnachbehandlungssystem mit den Merkmalen des Patentanspruchs 1 und durch ein Verfahren mit den Merkmalen des Patentanspruchs 6 gelöst. Vorteilhafte Ausgestaltungen mit zweckmäßigen Weiterbildungen der Erfindung sind in den abhängigen Patentansprüchen angegeben.This object is achieved by an exhaust gas aftertreatment system having the features of patent claim 1 and by a method having the features of patent claim 6. Advantageous embodiments with expedient developments of the invention are specified in the dependent claims.
Das erfindungsgemäße Abgasnachbehandlungssystem für ein Kraftfahrzeug umfasst wenigstens zwei Sensoren zum Erfassen eines jeweiligen Messwerts. Des Weiteren ist wenigstens eine Steuereinrichtung vorgesehen, mittels welcher in Abhängigkeit von den ausgewerteten Messwerten eine Funktionseinheit zum Beeinflussen des Abgases ansteuerbar ist. Die wenigstens zwei Sensoren sind mit einer gemeinsamen Auswerteeinheit zum Auswerten der Messwerte gekoppelt, von welcher aus die ausgewerteten Messwerte gebündelt und simultan über eine gemeinsame Kommunikationsstrecke der Steuereinrichtung zuführbar sind. Der Erfindung liegt die Erkenntnis zugrunde, dass es zum zuverlässigen Auswerten der jeweiligen Messwerte günstig ist, wenn das Auswerten der Messwerte vergleichsweise sensornah erfolgt. Werden nämlich die Messwerte, etwa in Form eines Stromsignals, zum Auswerten der in der Regel in einiger Entfernung von den Sensoren angeordneten Steuereinrichtung zugeführt, so sind aufgrund des in der Regel sehr geringen Stromsignals Verfälschungen der Messwerte zu erwarten, wenn das Signal über eine vergleichsweise lange Leitung transportiert wird.The exhaust gas aftertreatment system according to the invention for a motor vehicle comprises at least two sensors for detecting a respective measured value. Furthermore, at least one control device is provided, by means of which a functional unit for influencing the exhaust gas can be activated as a function of the evaluated measured values. The at least two sensors are coupled to a common evaluation unit for evaluating the measured values, from which the evaluated measured values can be bundled and simultaneously fed to the control device via a common communication link. The invention is based on the finding that it is favorable for the reliable evaluation of the respective measured values if the evaluation of the measured values takes place comparatively close to the sensor. If the measured values, for example in the form of a current signal, are supplied for evaluating the control device, which is generally arranged at some distance from the sensors, then falsifications of the measured values are to be expected on account of the generally very low current signal if the signal remains over a comparatively long time Cable is transported.
Dadurch dass die Messwerte der Sensoren vorliegend in einer gemeinsamen, der Steuereinrichtung vorgeschalteten Auswerteeinheit ausgewertet werden, kann die gemeinsame Auswerteeinheit vergleichsweise sensornah angeordnet sein und so ein besonders zuverlässiges Auswerten ermöglichen. Für die Übertragung des jeweiligen Stromsignals sind dann nämlich nur sehr kurze Leitungen vorzusehen.Since the measured values of the sensors in the present case are evaluated in a common evaluation unit connected upstream of the control unit, the common evaluation unit can be arranged comparatively close to the sensor and thus enable a particularly reliable evaluation. For the transmission of the respective current signal then only very short lines are to be provided.
Die Komplexität des Abgasnachbehandlungssystems wird darüber hinaus dadurch reduziert, dass nicht je Sensor eine separate Auswerteeinheit vorgesehen werden muss, wobei die eingesparte Elektronik zu einer Kostenersparnis, insbesondere in der Fertigung, zu einer höheren Zuverlässigkeit des Systems und einer Gewichtsreduzierung des Abgasnachbehandlungssystems beiträgt. Des Weiteren können durch das Vorsehen einer gemeinsamen, die Messwerte gebündelt und simultan der Steuereinrichtung zuführenden Kommunikationsstrecke Leitungen eingespart werden, was ebenfalls zu einer Kostenersparnis und zu einer Gewichtsreduzierung beiträgt. Die Kostenersparnis für das Vorsehen einer gemeinsamen Auswerteeinheit anstelle einer separaten Auswerteeinheit je Sensor kann bei der die Messwerte von zwei Sensoren verarbeitenden gemeinsamen Auswerteeinheit rund 20 Euro pro Kraftfahrzeug betragen.The complexity of the exhaust gas aftertreatment system is also reduced by not having to provide a separate evaluation unit per sensor, the saved electronics contributing to cost savings, in particular in production, to a higher reliability of the system and a reduction in the weight of the exhaust aftertreatment system. Furthermore, the provision of a common, the measured values bundled and simultaneously supplying the control device communication line can be saved lines, which also contributes to a cost savings and to a weight reduction. The cost savings for the provision of a common evaluation unit instead of a separate evaluation unit per sensor can amount to approximately 20 euros per motor vehicle in the common evaluation unit processing the measured values of two sensors.
Durch einen Multiplexbetrieb der gemeinsamen Auswerteeinheit kann ein besonders effizientes Auswerten der Signale der Sensoren erfolgen. Bei der Signalverarbeitung in der gemeinsamen Auswerteeinheit sind vorteilhaft eine Analog/Digital-Wandlung sowie eine Signalfilterung vorgesehen. Aufgrund der Signale der Sensoren ermittelt eine integrierte Recheneinheit Konzentrationswerte, welche mit den Signalen der Sensoren korrelieren.By a multiplex operation of the common evaluation unit, a particularly efficient evaluation of the signals of the sensors can take place. In the signal processing in the common evaluation unit advantageously an analog / digital conversion and signal filtering are provided. Based on the signals from the sensors, an integrated computing unit determines concentration values which correlate with the signals of the sensors.
Wenn die gemeinsame Auswerteeinheit jeweils einen Prozessorkern zum Verarbeiten der Messwerte des jeweiligen Sensors aufweist, also als so genannte Dual-Core-Einheit ausgebildet ist, kann eine parallele Ermittlung der Konzentrationswerte erfolgen und so das Berechnen besonders rasch durchgeführt werden. Alternativ kann auch eine getaktete, abwechselnde Bearbeitung der Eingangssignale durch lediglich einen Prozessor vorgesehen sein.If the common evaluation unit in each case has a processor core for processing the measured values of the respective sensor, ie as So-called dual-core unit is formed, a parallel determination of the concentration values can be carried out and so the calculation can be carried out very quickly. Alternatively, a clocked, alternating processing of the input signals by only one processor may be provided.
Gemäß einem weiteren Aspekt der Erfindung wird die oben genannte Aufgabe gelöst durch ein Verfahren zum Betreiben eines Abgasnachbehandlungssystems für ein Kraftfahrzeug, bei welchem wenigstens zwei Sensoren einen jeweiligen Messwert erfassen. Wenigstens eine Steuereinheit steuert in Abhängigkeit von den ausgewerteten Messwerten eine Funktionseinheit zum Beeinflussen des Abgases an. Die jeweiligen Messwerte der wenigstens zwei Sensoren werden mittels einer mit den wenigstens zwei Sensoren gekoppelten gemeinsamen Auswerteeinheit ausgewertet, welche die ausgewerteten Messwerte gebündelt und simultan über eine gemeinsame Kommunikationsstrecke der Steuereinrichtung zuführt.According to a further aspect of the invention, the above-mentioned object is achieved by a method for operating an exhaust gas aftertreatment system for a motor vehicle, in which at least two sensors detect a respective measured value. At least one control unit controls a functional unit for influencing the exhaust gas in dependence on the evaluated measured values. The respective measured values of the at least two sensors are evaluated by means of a common evaluation unit coupled to the at least two sensors, which bundles the evaluated measured values and simultaneously feeds them to the control device via a common communication path.
Die für das erfindungsgemäße Abgasnachbehandlungssystem beschriebenen Vorteile und bevorzugten Ausführungsformen gelten auch für das erfindungsgemäße Verfahren zum Betreiben eines Abgasnachbehandlungssystems.The advantages and preferred embodiments described for the exhaust aftertreatment system according to the invention also apply to the method according to the invention for operating an exhaust aftertreatment system.
Die vorstehend in der Beschreibung genannten Merkmale und Merkmalskombinationen sowie die nachfolgend in der Figurenbeschreibung genannten und/oder in den Figur alleine gezeigten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar, ohne den Rahmen der Erfindung zu verlassen.The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figure can be used not only in the combination indicated, but also in other combinations or in isolation, without the scope of To leave invention.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Ansprüchen, der nachfolgenden Beschreibung bevorzugter Ausführungsformen sowie anhand der Zeichnung.Further advantages, features and details of the invention will become apparent from the claims, the following description of preferred embodiments and from the drawing.
Diese zeigt schematisch und ausschnittsweise ein Abgasnachbehandlungssystem eines Kraftfahrzeugs.This shows schematically and partially an exhaust aftertreatment system of a motor vehicle.
Ein in der Figur schematisch gezeigtes Abgasnachbehandlungssystem
Zum mengenmäßig kontrollierten Einbringen des Reduktionsmittels in den Abgasstrang
Die Messwerte der Sensoren
Über eine gemeinsame, als Kommunikationsstrecke dienende Leitung
Bevorzugt ist die Leitung
Bevorzugt ist die gemeinsame Auswerteeinheit
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 19736384 A1 [0002] DE 19736384 A1 [0002]
Claims (6)
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DE102009050067A DE102009050067A1 (en) | 2009-10-14 | 2009-10-14 | Exhaust gas after treatment system for motor vehicle, has two sensors for detection of measurement values and control device by which functional unit is controllable depending on evaluated measurement values |
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DE102009050067A DE102009050067A1 (en) | 2009-10-14 | 2009-10-14 | Exhaust gas after treatment system for motor vehicle, has two sensors for detection of measurement values and control device by which functional unit is controllable depending on evaluated measurement values |
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DE102009050067A1 true DE102009050067A1 (en) | 2011-04-21 |
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DE102009050067A Withdrawn DE102009050067A1 (en) | 2009-10-14 | 2009-10-14 | Exhaust gas after treatment system for motor vehicle, has two sensors for detection of measurement values and control device by which functional unit is controllable depending on evaluated measurement values |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19736384A1 (en) | 1997-08-21 | 1999-02-25 | Man Nutzfahrzeuge Ag | Method for metering a reducing agent into nitrogen oxide-containing exhaust gas from an internal combustion engine |
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- 2009-10-14 DE DE102009050067A patent/DE102009050067A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19736384A1 (en) | 1997-08-21 | 1999-02-25 | Man Nutzfahrzeuge Ag | Method for metering a reducing agent into nitrogen oxide-containing exhaust gas from an internal combustion engine |
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