EP1056942B1 - Control system for internal combustion engine comprising a sensor and an interface for digitising measurement values - Google Patents
Control system for internal combustion engine comprising a sensor and an interface for digitising measurement values Download PDFInfo
- Publication number
- EP1056942B1 EP1056942B1 EP99934326A EP99934326A EP1056942B1 EP 1056942 B1 EP1056942 B1 EP 1056942B1 EP 99934326 A EP99934326 A EP 99934326A EP 99934326 A EP99934326 A EP 99934326A EP 1056942 B1 EP1056942 B1 EP 1056942B1
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- Prior art keywords
- sensor
- control system
- interface
- analysis unit
- connector
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6683—Structural association with built-in electrical component with built-in electronic circuit with built-in sensor
Definitions
- the invention relates to a control system for an internal combustion engine with an engine control unit and a sensor, the one Has interface to the engine control unit, as well as a Sensor unit, which comprises a sensor and an evaluation unit, as defined in claim 1, first part.
- a very high resolution of the measured values is increasingly necessary.
- An example of this is the operation of a storage catalytic converter, the nitrogen oxide in the lean operation of the engine with excess oxygen ( ⁇ > 1) attaches.
- the nitrogen oxide concentration increases at the outlet of the catalytic converter, they must be in the storage catalytic converter accumulated nitrogen oxides by adjusting the Fuel mixture can be reduced to ⁇ 1 again.
- ⁇ 1 the concentration of 10 ppm can. This means that measuring currents are of the order of magnitude of 50 nA must be evaluated.
- US 4,428,348 describes a digital control system for an internal combustion engine with sensors for monitoring the operating conditions.
- the sensors give analog Signals from using an A / D converter to digital signals be implemented.
- a microprocessor receives the digital Signals to control the operation of the internal combustion engine.
- the analog sensor signals are sent to a microcomputer unit directed. To mutual interference of the analog signals to eliminate, filters are installed upstream of the microcomputer unit.
- US 4,337,745 relates to a control system for an internal combustion engine with a control unit and an oxygen sensor for monitoring the exhaust gases. To certain sensor characteristics to eliminate, the sensor signal in Control unit compensated.
- the control unit includes a heater control for the exhaust gas probe, a Current detection circuit for detecting one from the exhaust gas probe detected current, an analog / digital converter for conversion of the detected current into a digital signal and a microprocessor for processing sensor signals and for control an internal combustion engine. Because of one in the engine compartment Motor vehicle occurring electromagnetic interference and due to parasitic conductivities and capacitances only signals of the exhaust gas probe are evaluated, the one exceed a certain level.
- a hot film air mass sensor is from the German utility model G 89 10 740 known with a bracket in which a sensor chip together with an evaluation circuit as one Sensor unit is arranged in the air flow to be measured.
- the sensor and the evaluation unit are functional Unit summarized.
- An already necessary connector for the sensor can a housing to accommodate the evaluation unit has been expanded become.
- the sensor with the evaluation unit integrated in the interface has an "intelligent interface" there is communication between the engine control unit and the evaluation unit via a system bus.
- a system bus To one System sensors can also be connected to the system bus have an evaluation unit on site.
- the system bus allows a reduction in the number of connecting lines to the engine control unit. This also results in a reduction the number of connector pins on the engine control unit, which can consequently be made more compact.
- the evaluation unit comprises a microprocessor or a computing unit, so can be a particularly simple in manufacturing Calibration of the sensor is done. There is also a software update possible with a vehicle that is already delivered to the customer was delivered.
- the one integrated in the interface is preferably located Evaluation unit as close as possible to the sensor, however spaced from it so that hostile environmental conditions no malfunction in the area of the sensor the evaluation unit.
- the Evaluation unit can regulate the sensor, for example a Heating the sensor, and thus relieve the engine control. Furthermore, the evaluation unit can function locally diagnose the sensor. In the event of a malfunction, the Unit consisting of sensor and interface, including the integrated Evaluation unit, can be easily replaced without that a comparison with the engine control unit would be necessary.
- the figure shows a control system with a control unit and a sensor unit.
- An engine control unit 1 is provided with a sensor is an exhaust gas probe 2 and more precisely a nitrogen oxide probe, connected via an interface 21.
- the interface 21 consists of a connector, a electrically conductive housing 23 for the connector and an evaluation unit integrated in this connector housing 211.
- the housing 23 has a metallic cooling surface 231 on, which can be designed as a cooling flange.
- the cooling surface 231 is via a thermal path 232 to the surface a power component 212 connected.
- the evaluation unit 211 is together with the ends of signal-carrying connecting lines 22 with plastic, for example silicone, potted so that an optimal seal against moisture is achieved.
- the thermal path 232 along with the Cooling surface 231, despite the potting, sufficient heat dissipation ready.
- the sensor and the evaluation unit form a functional one Unit, namely a sensor unit.
- a water-repellent (hydrophobic) membrane in the housing 23 allows an air supply through connecting lines 11 leading to Guide engine control unit 1.
- the supply of the exhaust gas probe 2 with an oxygen reference takes place via a connecting line 22, which serves to heat the exhaust gas probe 2, since this in contrast to a signal line under the connecting lines 22, not together with the evaluation unit 211 is shed.
- the connecting lines 22 between the exhaust gas probe and the Interface 21 are about 0.15 m to 0.5 m long.
- the connecting lines 11 between the interface 21 and the engine control unit 1 are about 1.5 m to 5 m long.
- a cheap one Length for the connecting lines 22 to the probe 2, in which on the one hand, the electronics of the evaluation unit 211 far enough is arranged from the heat-generating exhaust tract without too high parasitic effects on the signal-carrying connecting lines 22 would occur is about 0.3 m. typically, is then the length of the connecting lines 11 between the interface 21 and the engine control unit 1 approximately 2 m.
- the connecting lines 22 Because of the short distance between the interface 21 and the exhaust gas probe 2, the connecting lines 22 easily sealed against moisture and safe against kinking To run. Therefore, only extremely small parasitic occur Conductance values or leakage resistances in the range of more than 10 M ⁇ on. Because of the short distance between the exhaust gas probe 2 and the interface 21, and more precisely the evaluation unit 211 the connecting lines 22 are not very sensitive to electromagnetic Disorders. The electromagnetic compatibility can be further improved if the connecting lines 22 are shielded. This is due to the short distance that requires little flexibility easily and inexpensively possible.
- the evaluation unit 211 according to the invention can be used without problems Detect measuring currents of 50 nA without noise or interference prevent a usable measurement result.
- Central component of the measurement and control electronics of the Evaluation unit 211 is a microprocessor and more precisely one Microcontroller with a non-volatile memory and few Hardware components.
- the latter include a voltage regulator to operate the microcontroller, few active electronic Components and finally the exhaust gas probe 2.
- the evaluation unit 211 has an impedance converter for adaptation the high-resistance signals of the exhaust gas probe 2 to the impedance an analog / digital converter integrated in the microcontroller on. Via a digital / analog converter are those at the interface 21 to the connecting lines 22 signals to be output again measured to control signals for the operation of the exhaust gas probe and a reference signal produce.
- the evaluation unit 211 further comprises a generator for generation a test signal that is used for the indirect determination of the Probe temperature by determining the probe impedance.
- the evaluation unit 211 also includes a power component to control the heating of the exhaust gas probe by means of pulse width modulation (PWM).
- PWM pulse width modulation
- the microcontroller controls this Power device the pulse width such that the probe temperature remains within the permissible operating range. This is typically 750 ° C for a nitrogen oxide probe up to 850 ° C.
- a mating connector 12 connects that as a connector trained interface 21 with an energy source and over a system bus 111 with the engine control unit 1.
- the system bus 111 is designed as a CAN bus.
- microprocessor Due to the use of a microprocessor in the evaluation unit 211 permanently results in a high accuracy of the Electronics. In addition, the microprocessor's main memory Manufacturing data of the exhaust gas probe 2 to correct the Measured and control variables are saved.
- connecting lines 11 Due to the digital interface 21 to the engine control unit 1 can the number of connecting lines 11 to the engine control unit be significantly reduced. For example, it can Connection lines for the probe heating can be dispensed with. Two connecting lines 11 are sufficient as a system bus. In addition, several units can be made up of sensors with evaluation units can be connected to a single system bus. The Evaluation units must each have a bus controller. This function can be carried out by the microprocessor of the evaluation unit 211 are taken over.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Electric Motors In General (AREA)
- Exhaust Silencers (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
Die Erfindung betrifft ein Steuersystem für eine Brennkraftmaschine mit einem Motorsteuergerät und einem Sensor, der eine Schnittstelle zum Motorsteuergerät aufweist, sowie eine Sensoreinheit, die einen Sensor und eine Auswerteeinheit umfaßt, wie es im Anspruch 1, erster Teil definiert ist.The invention relates to a control system for an internal combustion engine with an engine control unit and a sensor, the one Has interface to the engine control unit, as well as a Sensor unit, which comprises a sensor and an evaluation unit, as defined in claim 1, first part.
Zum Steuern von Verbrennungsmotoren in Kraftfahrzeugen werden häufig Meßwerte von Abgassonden benötigt. Aufgrund der hohen Abgastemperaturen befindet sich die Auswerteeinheit für die Meßwerte regelmäßig nicht unmittelbar an der Abgassonde, sondern im Motorsteuergerät.For controlling internal combustion engines in motor vehicles measurement values of exhaust gas probes are often required. Because of the high Exhaust gas temperatures is the evaluation unit for the Measured values regularly not directly at the exhaust gas probe, but instead in the engine control unit.
Zunehmend ist eine sehr hohe Auflösung der Meßwerte nötig. Ein Beispiel hierfür ist der Betrieb eines Speicherkatalysators, der Stickoxid im Magerbetrieb des Motors bei Sauerstoffüberschuß (λ>1) anlagert. Steigt die Stickoxidkonzentration am Ausgang des Katalysators an, so müssen die im Speicherkatalysator angelagerten Stickoxide durch Einstellung des Kraftstoffgemisches auf λ≤1 wieder reduziert werden. Hierzu ist eine extrem genaue, hochauflösende und zuverlässige Abgasmessung nötig, die eine Konzentration von 10 ppm noch registrieren kann. Dies bedeutet, daß Meßströme in der Größenordnung von 50 nA ausgewertet werden müssen.A very high resolution of the measured values is increasingly necessary. An example of this is the operation of a storage catalytic converter, the nitrogen oxide in the lean operation of the engine with excess oxygen (λ> 1) attaches. The nitrogen oxide concentration increases at the outlet of the catalytic converter, they must be in the storage catalytic converter accumulated nitrogen oxides by adjusting the Fuel mixture can be reduced to λ≤1 again. For this is an extremely accurate, high-resolution and reliable exhaust gas measurement necessary that still register a concentration of 10 ppm can. This means that measuring currents are of the order of magnitude of 50 nA must be evaluated.
Die Patentschrift US 4,428,348 beschreibt ein digitales Steuersystem für eine Brennkraftmaschine mit Sensoren zur Überwachung der Betriebsbedingungen. Die Sensoren geben analoge Signale aus, die mit einem A/D-Konverter in digitale Signale umgesetzt werden. Ein Mikroprozessor empfängt die digitalen Signale, um den Betrieb der Brennkraftmaschine zu steuern. Die analogen Sensorsignale werden an eine Mikrocomputereinheit geleitet. Um gegenseitige Störungen der analogen Signale zu eliminieren, sind der Mikrocomputereinheit Filter vorgeschaltet.US 4,428,348 describes a digital control system for an internal combustion engine with sensors for monitoring the operating conditions. The sensors give analog Signals from using an A / D converter to digital signals be implemented. A microprocessor receives the digital Signals to control the operation of the internal combustion engine. The analog sensor signals are sent to a microcomputer unit directed. To mutual interference of the analog signals to eliminate, filters are installed upstream of the microcomputer unit.
Die Patentschrift US 4,337,745 betrifft ein Steuersystem für eine Brennkraftmaschine mit einem Steuergerät und einem Sauerstoffsensor zur Überwachung der Abgase. Um bestimmte Sensorcharakteristika zu beseitigen, wird das Sensorsignal im Steuergerät kompensiert.US 4,337,745 relates to a control system for an internal combustion engine with a control unit and an oxygen sensor for monitoring the exhaust gases. To certain sensor characteristics to eliminate, the sensor signal in Control unit compensated.
Aus der Offenlegungsschrift DE 195 22 178 A1 ist eine Erfassungsvorrichtung für eine Sauerstoffkonzentration mit einer Abgassonde und einem Motorsteuergerät bekannt. Das Steuergerät umfaßt eine Heizungssteuerung für die Abgassonde, einen Stromerfassungskreis zum Detektieren eines von der Abgassonde erfaßten Stroms, einen Analog-/Digitalwandler zum Umsetzen des erfaßten Stroms in ein digitales Signal und einen Mikroprozessor zum Verarbeiten von Sensorsignalen und zur Steuerung einer Brennkraftmaschine. Aufgrund der im Motorraum eines Kraftfahrzeugs auftretenden elektromagnetischen Störungen und infolge von parasitären Leitwerten und Kapazitäten können lediglich Signale der Abgassonde ausgewertet werden, die einen gewissen Pegel überschreiten.From the published patent application DE 195 22 178 A1 there is a detection device for an oxygen concentration with a Exhaust gas probe and an engine control unit known. The control unit includes a heater control for the exhaust gas probe, a Current detection circuit for detecting one from the exhaust gas probe detected current, an analog / digital converter for conversion of the detected current into a digital signal and a microprocessor for processing sensor signals and for control an internal combustion engine. Because of one in the engine compartment Motor vehicle occurring electromagnetic interference and due to parasitic conductivities and capacitances only signals of the exhaust gas probe are evaluated, the one exceed a certain level.
Aus dem deutschen Gebrauchsmuster G 89 10 740 ist ein Heißfilm-Luftmassensensor mit einer Halterung bekannt, bei dem ein Sensor-Chip zusammen mit einer Auswerteschaltung als eine Sensoreinheit in dem zu messenden Luftstrom angeordnet ist.A hot film air mass sensor is from the German utility model G 89 10 740 known with a bracket in which a sensor chip together with an evaluation circuit as one Sensor unit is arranged in the air flow to be measured.
Es ist ein Ziel der Erfindung, ein Steuersystem für eine Brennkraftmaschine und eine Sensoreinheit bereitzustellen, die eine besonders exakte Steuerung oder Regelung einer Brennkraftmaschine in Bezug auf die Einhaltung von definierten Abgasgrenzwerten erlauben. It is an object of the invention to provide a control system for a To provide an internal combustion engine and a sensor unit which is a particularly precise control or regulation of a Internal combustion engine in terms of compliance with defined Allow emission limits.
Dieses Ziel wird mit einem Steuersystem nach Anspruch 1 erreicht. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.This goal is achieved with a control system according to claim 1 reached. Advantageous further developments are in the subclaims specified.
Durch die Integration der Auswerteeinheit in die Schnittstelle des Sensors lassen sich als Voraussetzung für eine präzise Messung hohe Leckwiderstände erzielen. Der Signalpfad von dem Sensor bis hin zur Auswerteeinheit läßt sich problemlos und dauerhaft gegen das Eindringen von Feuchtigkeit schützen, so daß das Auftreten von parasitären Leitwerten und Kapazitäten minimierte werden kann.By integrating the evaluation unit into the interface of the sensor can be used as a prerequisite for a precise Measure high leak resistance. The signal path from that Sensor to evaluation unit can be easily and permanently protect against the ingress of moisture, so that the appearance of parasitic conductivities and capacitances can be minimized.
Der Sensor und die Auswerteeinheit sind zu einer funktionalen Einheit zusammengefaßt.The sensor and the evaluation unit are functional Unit summarized.
Ein ohnehin notwendiger Steckverbinder für den Sensor kann um ein Gehäuse zur Unterbringung der Auswerteeinheit erweitert werden.An already necessary connector for the sensor can a housing to accommodate the evaluation unit has been expanded become.
Die zur Verbindung von Sensor und Schnittstelle notwendigen Verbindungsleitungen können problemlos wasserdicht gestaltet, mit Zugentlastung und Knickschutz versehen werden.The necessary to connect sensor and interface Connection lines can be made watertight without any problems, with strain relief and kink protection.
Da der Sensor mit der in die Schnittstelle integrierten Auswerteeinheit eine "intelligente Schnittstelle" aufweist, bietet sich eine Kommunikation zwischen dem Motorsteuergerät und der Auswerteeinheit über einen Systembus an. An einen solchen Systembus können weitere Sensoren angeschlossen sein, die ebenfalls eine Auswerteeinheit vor Ort aufweisen. Der Systembus erlaubt eine Verminderung der Zahl der Verbindungsleitungen zum Motorsteuergerät. Dadurch ergibt sich ferner eine Reduzierung der Zahl der Steckerstifte an dem Motorsteuergerät, das sich infolgedessen kompakter aufbauen läßt. Since the sensor with the evaluation unit integrated in the interface has an "intelligent interface" there is communication between the engine control unit and the evaluation unit via a system bus. To one System sensors can also be connected to the system bus have an evaluation unit on site. The system bus allows a reduction in the number of connecting lines to the engine control unit. This also results in a reduction the number of connector pins on the engine control unit, which can consequently be made more compact.
Durch die Übertragung digitaler Signale zwischen der Schnittstelle des Sensors und dem Motorsteuergerät erhöht sich die Unempfindlichkeit des Systems gegenüber elektromagnetischen Störungen.By transferring digital signals between the interface of the sensor and the engine control unit increases System insensitivity to electromagnetic Disorders.
Umfaßt die Auswerteeinheit einen Mikroprozessor oder eine Recheneinheit, so kann in der Fertigung eine besonders einfache Kalibrierung des Sensors erfolgen. Außerdem ist ein Software-Update bei einem Fahrzeug möglich, das bereits an den Kunden ausgeliefert wurde.If the evaluation unit comprises a microprocessor or a computing unit, so can be a particularly simple in manufacturing Calibration of the sensor is done. There is also a software update possible with a vehicle that is already delivered to the customer was delivered.
Vorzugsweise befindet sich die in die Schnittstelle integrierte Auswerteeinheit möglichst nahe an dem Sensor, ist aber in einem Abstand zu dieser angeordnet, so daß feindliche Umgebungsbedingungen im Bereich des Sensor keine Funktionsstörung der Auswerteeinheit verursachen.The one integrated in the interface is preferably located Evaluation unit as close as possible to the sensor, however spaced from it so that hostile environmental conditions no malfunction in the area of the sensor the evaluation unit.
Durch die Integration des Sensors und der Elektronik (Auswerteeinheit) kann ein individueller Abgleich des Sensors und der Elektronik zur Erhöhung der Meßgenauigkeit erfolgen. Die Auswerteeinheit kann den Sensor regeln, beispielsweise eine Heizung des Sensors, und somit die Motorsteuerung entlasten. Ferner kann die Auswerteeinheit lokal die Funktionsfähigkeit des Sensors diagnostizieren. Bei einer Fehlfunktion kann die Einheit aus Sensor und Schnittstelle, einschließlich der integrierten Auswerteeinheit, einfach ausgetauscht werden, ohne daß ein Abgleich mit dem Motorsteuergerät notwendig wäre.By integrating the sensor and electronics (evaluation unit) an individual adjustment of the sensor and the electronics to increase the measuring accuracy. The Evaluation unit can regulate the sensor, for example a Heating the sensor, and thus relieve the engine control. Furthermore, the evaluation unit can function locally diagnose the sensor. In the event of a malfunction, the Unit consisting of sensor and interface, including the integrated Evaluation unit, can be easily replaced without that a comparison with the engine control unit would be necessary.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der Erfindung ergeben sich aus der Beschreibung des Ausführungsbeispiels in Verbindung mit der Zeichnung.Further advantages, features and possible applications of the Invention result from the description of the embodiment in connection with the drawing.
Die Figur zeigt ein Steuersystem mit einem Steuergerät und einer Sensoreinheit. The figure shows a control system with a control unit and a sensor unit.
Ein Motorsteuergerät 1 ist mit einem Sensor, bei dem es sich
um eine Abgassonde 2 und genauer um eine Stickoxid-Sonde handelt,
über eine Schnittstelle 21 verbunden.An engine control unit 1 is provided with a sensor
is an
Die Schnittstelle 21 besteht aus einem Steckverbinder, einem
elektrisch leitendem Gehäuse 23 für den Steckverbinder und
einer in dieses Steckergehäuse integrierten Auswerteeinheit
211. Das Gehäuse 23 weist eine metallische Kühlfläche 231
auf, die als Kühlflansch ausgebildet sein kann. Die Kühlfläche
231 ist über einen thermischen Pfad 232 mit der Oberfläche
eines Leistungsbauelement 212 verbunden. Die Auswerteeinheit
211 ist zusammen mit den Enden von signalführenden Verbindungsleitungen
22 mit Kunststoff, beispielsweise Silikon,
vergossen, so daß eine optimale Abdichtung gegen Feuchtigkeit
erzielt wird. Der thermische Pfad 232 stellt zusammen mit der
Kühlfläche 231, trotz des Vergusses, eine ausreichende Wärmeableitung
bereit.The
Der Sensor und die Auswerteeinheit bilden eine funktionale Einheit, nämlich eine Sensoreinheit.The sensor and the evaluation unit form a functional one Unit, namely a sensor unit.
Eine wasserabweisende (hydrophobe) Membran im Gehäuse 23 erlaubt
eine Luftzufuhr durch Verbindungsleitungen 11, die zum
Motorsteuergerät 1 führen. Die Versorgung der Abgassonde 2
mit einer Sauerstoffreferenz erfolgt über eine Verbindungsleitung
22, die zur Beheizung der Abgassonde 2 dient, da diese,
im Gegensatz zu einer Signalleitung unter den Verbindungsleitungen
22, nicht zusammen mit der Auswerteeinheit 211
vergossen ist.A water-repellent (hydrophobic) membrane in the
Die Verbindungsleitungen 22 zwischen der Abgassonde und der
Schnittstelle 21 sind etwa 0,15 m bis 0,5 m lang. Die Verbindungsleitungen
11 zwischen der Schnittstelle 21 und dem Motorsteuergerät
1 sind etwa 1,5 m bis 5 m lang. Eine günstige
Länge für die Verbindungsleitungen 22 zur Sonde 2, bei der
einerseits die Elektronik der Auswerteeinheit 211 weit genug
von dem wärmeerzeugenden Abgastrakt angeordnet ist, ohne daß
zu hohe parasitäre Effekte auf den signalführenden Verbindungsleitungen
22 auftreten würden, ist etwa 0,3 m. Typischerweise
beträgt dann die Länge der Verbindungsleitungen 11
zwischen der Schnittstelle 21 und dem Motorsteuergerät 1 etwa
2 m.The connecting
Wegen der geringen Entfernung zwischen der Schnittstelle 21
und der Abgassonde 2 lassen sich die Verbindungsleitungen 22
problemlos dicht gegen Feuchtigkeit und sicher gegen Abknicken
ausführen. Es treten daher nur extrem geringe parasitäre
Leitwerte oder Leckwiderstände im Bereich von mehr als 10 MΩ
auf. Wegen der kurzen Entfernung zwischen der Abgassonde 2
und der Schnittstelle 21, und genauer der Auswerteeinheit 211
sind die Verbindungsleitungen 22 wenig empfindlich gegen elektromagnetische
Störungen. Die elektromagnetische Verträglichkeit
kann zusätzlich verbessert werden, wenn die Verbindungsleitungen
22 abgeschirmt werden. Dies ist aufgrund der
kurzen Entfernung, die nur wenig Flexibilität erfordert,
problemlos und kostengünstig möglich.Because of the short distance between the
Die erfindungsgemäße Auswerteeinheit 211 kann problemlos
Meßströme von 50 nA detektieren, ohne daß Rauschen oder Störungen
ein brauchbares Meßergebnis verhindern. Der Meßbereich
der Stickoxidsonde reicht bis 10 ppm herab.The
Zentraler Bestandteil der Meß- und Regelungselektronik der
Auswerteeinheit 211 ist ein Mikroprozessor und genauer ein
Mikrocontroller mit einem nichtflüchtigen Speicher und wenigen
Hardware-Komponenten. Letztere umfassen einen Spannungsregler
zum Betrieb des Mikrocontrollers, wenige aktive elektronische
Bauteile und schließlich die Abgassonde 2. Ferner
weist die Auswerteeinheit 211 einen Impedanzwandler zur Anpassung
der hochohmigen Signale der Abgassonde 2 an die Impedanz
eines in den Mikrocontroller integrierten Analog/Digital-Wandlers
auf. Über einen Digital-/Analog-Wandler
werden die an der Schnittstelle 21 an die Verbindungsleitungen
22 auszugebenden Signale nochmals gemessen, um Steuersignale
für den Betrieb der Abgassonde und ein Referenzsignal zu
erzeugen.Central component of the measurement and control electronics of the
Ferner umfaßt die Auswerteeinheit 211 einen Generator zur Erzeugung
eines Prüfsignals, das zur indirekten Ermittlung der
Sondentemperatur durch Bestimmung der Sondenimpedanz dient.
Außerdem umfaßt die Auswerteeinheit 211 ein Leistungsbauelement
zum Steuern der Heizung der Abgassonde mittels Pulsbreitenmodulation
(PWM). Der Mikrocontroller steuert über das
Leistungsbauelement die Pulsbreite derart, daß die Sondentemperatur
innerhalb des zulässigen Betriebsbereichs bleibt.
Dieser beträgt bei einer Stickoxidsonde typischerweise 750 °C
bis 850 °C.The
Ein Gegensteckverbinder 12 verbindet die als Steckverbinder
ausgebildete Schnittstelle 21 mit einer Energiequelle und über
einen Systernbus 111 mit dem Motorsteuergerät 1. Der Systembus
111 ist als CAN-Bus ausgeführt.A
An der Schnittstelle 21 werden digitale Signale oder pulsbreitenmodulierte
(PWM) Signale, die als digitale Signale im
Sinne der Erfindung betrachtet werden, ausgegeben. Diese digitalen
Signale können im Gegensatz zu den Meßsignalen der
Abgassonde 2 problemlos über längere Strecken in einem Motorraum
eines Kraftfahrzeugs geführt werden.At the
Aufgrund des Einsatzes eines Mikroprozessors in der Auswerteeinheit
211 ergibt sich dauerhaft eine hohe Genauigkeit der
Elektronik. Daneben können im Arbeitsspeicher des Mikroprozessors
Fertigungsdaten der Abgassonde 2 zur Korrektur der
Meß- und Regelgrößen gespeichert werden. Due to the use of a microprocessor in the
Aufgrund der digitalen Schnittstelle 21 zum Motorsteuergerät
1 kann die Zahl der Verbindungsleitungen 11 zum Motorsteuergerät
deutlich reduziert werden. Es kann beispielsweise auf
Verbindungsleitungen für die Sondenheizung verzichtet werden.
Es reichen zwei Verbindungsleitungen 11 als Systembus aus.
Zudem können mehrere Einheiten aus Sensoren mit Auswerteeinheiten
an einem einzigen Systembus angeschlossen werden. Die
Auswerteeinheiten müssen jeweils einen Buscontroller aufweisen.
Diese Funktion kann von dem Mikroprozessor der Auswerteeinheit
211 übernommen werden.Due to the
Claims (13)
- Control system for an internal combustion engine, with a sensor (2) and a connecting line (22) to transfer values measured by the sensor via an interface (21) to an analysis unit (211) to digitise the measured values, and with a connecting line (11) to transfer the digitised measured values from the analysis unit (211) to an engine control device (1),
characterised in that
the interface (21) is a connector, into whose housing (23) the analysis unit (211) is integrated. - Control system according to Claim 1, characterised in that the connector has an electrically conductive housing (23) to screen the analysis unit (211).
- Control system according to Claim 1 or 2, characterised in that the connector (21) or a corresponding reciprocal connector (12) has a cooling flange (231) or a cooling surface with a thermal connection (232) to at least one power module (212) of the analysis unit (211).
- Control system according to one of the preceding claims, characterised in that the sensor (2) is an exhaust gas probe.
- Control system according to one of the preceding claims, characterised in that the interface (21) and the electric connecting line (22) to the sensor are moisture-proof.
- Control system according to one of the preceding claims, characterised in that the connecting line (22) between the sensor (2) and the interface (21) is electromagnetically screened.
- Control system according to one of the preceding claims, characterised in that the connecting line (11) to the engine control device (1) is a system bus (111).
- Control system according to Claim 7, characterised in that a plurality of sensors (2) are connected to the control device (1) via the system bus (111).
- Control system according to one of the preceding claims, characterised in that the analysis unit (211) has a microprocessor.
- Control system according to Claim 9, characterised in that the microprocessor can be configured individually for the sensor (2) using software.
- Control system according to one of the preceding claims, characterised in that a sensor heating system can be regulated by the analysis unit (211).
- Control system according to one of the preceding claims, characterised in that the analysis unit (211) can be adjusted by the engine control device (1) using operating data.
- Control system according to one of the preceding claims, characterised in that the interface (21) is located nearer to the sensor (2) than to the engine control device (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19807215A DE19807215C2 (en) | 1998-02-20 | 1998-02-20 | Control system for an internal combustion engine |
| DE19807215 | 1998-02-20 | ||
| PCT/DE1999/000100 WO1999042717A1 (en) | 1998-02-20 | 1999-01-18 | Control system for internal combustion engine comprising a sensor and an interface for digitising measurement values |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1056942A1 EP1056942A1 (en) | 2000-12-06 |
| EP1056942B1 true EP1056942B1 (en) | 2002-08-28 |
Family
ID=7858437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99934326A Expired - Lifetime EP1056942B1 (en) | 1998-02-20 | 1999-01-18 | Control system for internal combustion engine comprising a sensor and an interface for digitising measurement values |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US7050902B1 (en) |
| EP (1) | EP1056942B1 (en) |
| JP (1) | JP2002504648A (en) |
| KR (1) | KR100687960B1 (en) |
| CN (1) | CN1114755C (en) |
| BR (1) | BR9908092A (en) |
| CA (1) | CA2321501A1 (en) |
| DE (2) | DE19807215C2 (en) |
| ES (1) | ES2183580T3 (en) |
| WO (1) | WO1999042717A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4153113B2 (en) * | 1998-12-04 | 2008-09-17 | 株式会社デンソー | Gas concentration detector |
| DE19859580C2 (en) * | 1998-12-22 | 2001-03-29 | Siemens Ag | Method for operating an exhaust gas sensor in the exhaust system of an internal combustion engine |
| EP1477655A1 (en) * | 2003-05-13 | 2004-11-17 | Haldor Topsoe A/S | Process for controlled addition of a reducing agent into nitrogen oxides containing exhaust gas |
| DE10328014A1 (en) * | 2003-06-23 | 2005-01-13 | Volkswagen Ag | Drive system for vehicle comprises calculating unit spatially separated from control device and connected to exhaust gas sensors |
| US7644576B2 (en) * | 2005-04-25 | 2010-01-12 | Ngk Spark Plug Co., Ltd. | Sensor control device |
| DE102005062602A1 (en) | 2005-12-27 | 2007-07-05 | Robert Bosch Gmbh | Control module used in a vehicle comprises a control unit with a closed housing, a connecting unit for coupling a connecting element of an electrical cable and a pressure equalizing unit |
| JP4739104B2 (en) * | 2006-04-21 | 2011-08-03 | 日本特殊陶業株式会社 | Sensor control device |
| US8370017B2 (en) | 2009-07-13 | 2013-02-05 | Ford Global Technologies, Llc | Smart vehicle sensor |
| CN103221649B (en) * | 2010-10-04 | 2015-11-25 | 万国引擎知识产权有限责任公司 | To the diagnosis of the hydrocarbon injection for filter regeneration |
| DE102011004492A1 (en) * | 2011-02-22 | 2012-08-23 | Robert Bosch Gmbh | Lambda probe for determining oxygen content in exhaust gas of internal combustion engine, has evaluation unit that controls and evaluates sensor element for driving heating element to digitize measurement signals of sensor element |
| DE102018221819A1 (en) * | 2018-12-14 | 2020-06-18 | Robert Bosch Gmbh | Connector and control device for a motor vehicle with a connector |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4214472A (en) * | 1979-01-22 | 1980-07-29 | Ford Motor Company | Exhaust gas oxygen sensor and electrical connector arrangement |
| US4337745A (en) * | 1980-09-26 | 1982-07-06 | General Motors Corporation | Closed loop air/fuel ratio control system with oxygen sensor signal compensation |
| JPS5797105A (en) * | 1980-12-10 | 1982-06-16 | Nissan Motor Co Ltd | Digital controller for internal combustion engine |
| JPS57130842A (en) * | 1981-02-06 | 1982-08-13 | Nippon Denso Co Ltd | Electronic system for mounting on vehicle |
| JPS58150864A (en) * | 1982-03-03 | 1983-09-07 | Toyota Motor Corp | Detection of rotational speed of electronically controlled engine |
| KR880009387A (en) | 1987-01-30 | 1988-09-15 | 더머 제트.엘 | Smart sensor system for diagnostic monitoring |
| JP2555055B2 (en) * | 1987-03-13 | 1996-11-20 | 株式会社日立製作所 | Engine controller |
| US4963246A (en) * | 1987-12-14 | 1990-10-16 | Honda Giken Kogyo Kabushiki Kaisha | Oxygen concentration-sensing device |
| US5024534A (en) * | 1988-09-27 | 1991-06-18 | Ngk Spark Plug Co., Ltd. | Temperature sensor for use in a spark plug of an internal combustion engine |
| DE8910740U1 (en) * | 1989-09-08 | 1989-11-02 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
| US5161087A (en) * | 1990-10-15 | 1992-11-03 | International Business Machines Corporation | Pivotal heat sink assembly |
| US5547552A (en) * | 1994-06-20 | 1996-08-20 | Nippondenso Co., Ltd. | Oxygen concentration detecting apparatus |
| US5869744A (en) * | 1996-10-18 | 1999-02-09 | Honda Giken Kogyo Kabushiki Kaisha | Oxygen concentration-detecting device for internal combustion engines |
| US6254750B1 (en) * | 1997-07-29 | 2001-07-03 | Ecm Engine Control And Monitoring | Exhaust emission sensors |
-
1998
- 1998-02-20 DE DE19807215A patent/DE19807215C2/en not_active Expired - Fee Related
-
1999
- 1999-01-18 WO PCT/DE1999/000100 patent/WO1999042717A1/en active IP Right Grant
- 1999-01-18 US US09/622,696 patent/US7050902B1/en not_active Expired - Lifetime
- 1999-01-18 KR KR1020007009093A patent/KR100687960B1/en not_active IP Right Cessation
- 1999-01-18 EP EP99934326A patent/EP1056942B1/en not_active Expired - Lifetime
- 1999-01-18 CA CA002321501A patent/CA2321501A1/en not_active Abandoned
- 1999-01-18 CN CN99801878A patent/CN1114755C/en not_active Expired - Lifetime
- 1999-01-18 ES ES99934326T patent/ES2183580T3/en not_active Expired - Lifetime
- 1999-01-18 BR BR9908092-3A patent/BR9908092A/en not_active IP Right Cessation
- 1999-01-18 JP JP2000532632A patent/JP2002504648A/en active Pending
- 1999-01-18 DE DE59902462T patent/DE59902462D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2321501A1 (en) | 1999-08-26 |
| ES2183580T3 (en) | 2003-03-16 |
| CN1114755C (en) | 2003-07-16 |
| US7050902B1 (en) | 2006-05-23 |
| BR9908092A (en) | 2000-10-31 |
| DE59902462D1 (en) | 2002-10-02 |
| DE19807215C2 (en) | 2000-06-08 |
| EP1056942A1 (en) | 2000-12-06 |
| WO1999042717A1 (en) | 1999-08-26 |
| CN1287591A (en) | 2001-03-14 |
| DE19807215A1 (en) | 1999-08-26 |
| KR100687960B1 (en) | 2007-02-27 |
| JP2002504648A (en) | 2002-02-12 |
| KR20010041056A (en) | 2001-05-15 |
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