EP1056942B1 - Systeme de commande pour moteur a combustion interne comportant un capteur et une interface pour la numerisation des valeurs de mesure - Google Patents

Systeme de commande pour moteur a combustion interne comportant un capteur et une interface pour la numerisation des valeurs de mesure Download PDF

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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
Authority
EP
European Patent Office
Prior art keywords
sensor
control system
interface
analysis unit
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99934326A
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German (de)
English (en)
Other versions
EP1056942A1 (fr
Inventor
Stephan Bolz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
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Siemens AG
Siemens Corp
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Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1056942A1 publication Critical patent/EP1056942A1/fr
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Publication of EP1056942B1 publication Critical patent/EP1056942B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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.

Landscapes

  • 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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Silencers (AREA)
  • Control Of Electric Motors In General (AREA)

Claims (13)

  1. Système de commande pour un moteur à combustion interne comprenant un capteur (2) et une ligne de connexion (22) destinée à transmettre des valeurs mesurées du capteur, par l'intermédiaire dune interface (21), à une unité d'analyse (211) pour la numérisation des valeurs mesurées, et une ligne de connexion (11) pour transmettre les valeurs mesurées numérisées de l'unité d'analyse (211) à un appareil de commande (1 ) du moteur,
       caractérisé en ce que l'interface (21) est un connecteur à broches dans le boítier (23) duquel l'unité d'analyse (211) est intégrée.
  2. Système de commande selon la revendication 1, caractérisé en ce que le connecteur à broches comprend un boítier (23) conducteur de l'électricité pour le blindage de l'unité d'analyse (211).
  3. Système de commande selon la revendication 1 ou 2, caractérisé en ce que le connecteur à broches (21) ou un connecteur à broches complémentaire (12) qui lui correspond présente une ailette de refroidissement (231) ou une surface de refroidissement avec une liaison thermique (232) avec au moins un composant de puissance (212) de l'unité d'analyse (211).
  4. Système de commande selon Tune des revendications précédentes, caractérisé en ce que le capteur (2) est une sonde de gaz d'échappement.
  5. Système de commande selon Tune des revendications précédentes, caractérisé en ce que l'interface (21) et la ligne de connexion électrique (22) aboutissant au capteur sont étanches à l'humidité.
  6. Système de commande selon Tune des revendications précédentes, caractérisé en ce que la ligne de connexion (22) entre le capteur (2) et l'interface (21) est blindée pour la protection électromagnétique.
  7. Système de commande selon Tune des revendications précédentes, caractérisé en ce que la ligne de connexion (11) aboutissant à l'appareil de commande (1) du moteur est un bus de système (111).
  8. Système de commande selon la revendication 7, caractérisé en ce qu'une pluralité de capteurs (2) est reliée à l'appareil de commande (1) par l'intermédiaire du bus de système (111).
  9. Système de commande selon Tune des revendications précédentes, caractérisé en ce que l'unité d'analyse (211) présente un microprocesseur.
  10. Système de commande salon la revendication 9, caractérisé en ce que le microprocesseur peut être adapté individuellement au capteur (2) par un logiciel.
  11. Système de commands selon Tune des revendications précédentes, caractérisé en ce qu'un chauffage du capteur peut être réglé par l'unité d'analyse (211).
  12. Système de commands selon Tune des revendications précédentes, caractérisé en ce que l'unité d'analyse (211) peut être réglée avec des données de fonctionnement par la commands (1) de moteur.
  13. Système de commands selon Tune des revendications précédentes, caractérisé en ce que l'interface (21) est disposée plus près du capteur (2) que de l'appareil de commande (1) du moteur.
EP99934326A 1998-02-20 1999-01-18 Systeme de commande pour moteur a combustion interne comportant un capteur et une interface pour la numerisation des valeurs de mesure Expired - Lifetime EP1056942B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19807215 1998-02-20
DE19807215A DE19807215C2 (de) 1998-02-20 1998-02-20 Steuersystem für eine Brennkraftmaschine
PCT/DE1999/000100 WO1999042717A1 (fr) 1998-02-20 1999-01-18 Systeme de commande pour moteur a combustion interne comportant un capteur et une interface pour la numerisation des valeurs de mesure

Publications (2)

Publication Number Publication Date
EP1056942A1 EP1056942A1 (fr) 2000-12-06
EP1056942B1 true EP1056942B1 (fr) 2002-08-28

Family

ID=7858437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99934326A Expired - Lifetime EP1056942B1 (fr) 1998-02-20 1999-01-18 Systeme de commande pour moteur a combustion interne comportant un capteur et une interface pour la numerisation des valeurs de mesure

Country Status (10)

Country Link
US (1) US7050902B1 (fr)
EP (1) EP1056942B1 (fr)
JP (1) JP2002504648A (fr)
KR (1) KR100687960B1 (fr)
CN (1) CN1114755C (fr)
BR (1) BR9908092A (fr)
CA (1) CA2321501A1 (fr)
DE (2) DE19807215C2 (fr)
ES (1) ES2183580T3 (fr)
WO (1) WO1999042717A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4153113B2 (ja) * 1998-12-04 2008-09-17 株式会社デンソー ガス濃度検出装置
DE19859580C2 (de) * 1998-12-22 2001-03-29 Siemens Ag Verfahren zum Betreiben eines Abgas-Messaufnehmers im Abgassystem einer Brennkraftmaschine
EP1477655A1 (fr) * 2003-05-13 2004-11-17 Haldor Topsoe A/S Procédé d'injection contrôlée d'un agent réducteur dans des gaz d'échappement contenant des oxydes d'azote
DE10328014A1 (de) * 2003-06-23 2005-01-13 Volkswagen Ag Antriebssystem für ein Kraftfahrzeug
US7644576B2 (en) 2005-04-25 2010-01-12 Ngk Spark Plug Co., Ltd. Sensor control device
DE102005062602A1 (de) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Steuergerätemodul, insbesondere in oder für ein Kraftfahrzeug
JP4739104B2 (ja) * 2006-04-21 2011-08-03 日本特殊陶業株式会社 センサ制御装置
US8370017B2 (en) 2009-07-13 2013-02-05 Ford Global Technologies, Llc Smart vehicle sensor
CN103221649B (zh) * 2010-10-04 2015-11-25 万国引擎知识产权有限责任公司 对用于过滤器再生的碳氢化合物喷射的诊断
DE102011004492A1 (de) * 2011-02-22 2012-08-23 Robert Bosch Gmbh Lamdasonde und Verfahren zum Betrieb einer Lamdasonde
DE102018221819A1 (de) * 2018-12-14 2020-06-18 Robert Bosch Gmbh Steckverbinder und Steuergerät für ein Kraftfahrzeug mit einem Steckverbinder

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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 (ja) * 1982-03-03 1983-09-07 Toyota Motor Corp 電子制御機関における機関回転速度の検出方法
KR880009387A (ko) * 1987-01-30 1988-09-15 더머 제트.엘 진단 모니터링을 위한 스마트센서 시스템
JP2555055B2 (ja) * 1987-03-13 1996-11-20 株式会社日立製作所 エンジン制御装置
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 (de) * 1989-09-08 1989-11-02 Siemens AG, 1000 Berlin und 8000 München Heißfilmluftmassenmesser
US5161087A (en) * 1990-10-15 1992-11-03 International Business Machines Corporation Pivotal heat sink assembly
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US6254750B1 (en) * 1997-07-29 2001-07-03 Ecm Engine Control And Monitoring Exhaust emission sensors

Also Published As

Publication number Publication date
EP1056942A1 (fr) 2000-12-06
JP2002504648A (ja) 2002-02-12
CN1114755C (zh) 2003-07-16
ES2183580T3 (es) 2003-03-16
CN1287591A (zh) 2001-03-14
KR20010041056A (ko) 2001-05-15
DE19807215A1 (de) 1999-08-26
CA2321501A1 (fr) 1999-08-26
US7050902B1 (en) 2006-05-23
KR100687960B1 (ko) 2007-02-27
WO1999042717A1 (fr) 1999-08-26
BR9908092A (pt) 2000-10-31
DE59902462D1 (de) 2002-10-02
DE19807215C2 (de) 2000-06-08

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