EP1056942B1 - Steuersystem für eine brennkraftmaschine mit einem sensor und einer schnittstelle zur digitalisierung der messwerte - Google Patents
Steuersystem für eine brennkraftmaschine mit einem sensor und einer schnittstelle zur digitalisierung der messwerte 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
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 10
- 238000005259 measurement Methods 0.000 title description 6
- 239000000523 sample Substances 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 description 32
- 239000007789 gas Substances 0.000 description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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)
- Control Of Electric Motors In General (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Silencers (AREA)
Description
Claims (13)
- Steuersystem für eine Brennkraftmaschine, mit einem Sensor (2) und einer Verbindungsleitung (22) zur Übertragung von Messwerten des Sensors über eine Schnittstelle (21) zu einer Auswerteeinheit (211) zur Digitalisierung der Messwerte, und mit einer Verbindungsleitung (11) zur Übertragung der digitalisierten Messwerte von der Auswerteeinheit (211) zu einem Motorsteuergerät (1),
dadurch gekennzeichnet, dass die Schnittstelle (21) ein Steckverbinder ist, in dessen Gehäuse (23) die Auswerteeinheit (211) integriert ist. - Steuersystem nach Anspruch 1, dadurch gekennzeichnet, dass der Steckverbinder ein elektrisch leitendes Gehäuse (23) zur Schirmung der Auswerteeinheit (211) aufweist.
- Steuersystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Steckverbinder (21) oder ein mit ihm korrespondierender Gegensteckverbinder (12) einen Kühlflansch (231) oder eine Kühlfläche mit einer thermischen Verbindung (232) zu wenigstens einem Leistungsbauelement (212) der Auswerteeinheit (211) aufweist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Sensor (2) eine Abgassonde ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schnittstelle (21) und die elektrische Verbindungsleitung (22) zum Sensor feuchtigkeitsdicht sind.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsleitung (22) zwischen dem Sensor (2) und der Schnittstelle (21) elektromagnetisch geschirmt ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsleitung (11) zum Motorsteuergerät (1) ein Systembus (111) ist.
- Steuersystem nach Anspruch 7, dadurch gekennzeichnet, dass über den Systembus (111) eine Mehrzahl von Sensoren (2) mit dem Steuergerät (1) verbunden ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Auswerteeinheit (211) einen Mikroprozessor aufweist.
- Steuersystem nach Anspruch 9, dadurch gekennzeichnet, dass der Mikroprozessor mit Software individuell auf den Sensor (2) abstimmbar ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Heizung des Sensors durch die Auswerteeinheit (211) regelbar ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Auswerteeinheit (211) durch die Motorsteuerung (1) mit Betriebsdaten einstellbar ist.
- Steuersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schnittstelle (21) näher zum Sensor (2) als zum Motorsteuergerät (1) angeordnet ist.
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 (de) | 1998-02-20 | 1999-01-18 | Steuersystem für eine brennkraftmaschine mit einem sensor und einer schnittstelle zur digitalisierung der messwerte |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1056942A1 EP1056942A1 (de) | 2000-12-06 |
EP1056942B1 true EP1056942B1 (de) | 2002-08-28 |
Family
ID=7858437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99934326A Expired - Lifetime EP1056942B1 (de) | 1998-02-20 | 1999-01-18 | Steuersystem für eine brennkraftmaschine mit einem sensor und einer schnittstelle zur digitalisierung der messwerte |
Country Status (10)
Country | Link |
---|---|
US (1) | US7050902B1 (de) |
EP (1) | EP1056942B1 (de) |
JP (1) | JP2002504648A (de) |
KR (1) | KR100687960B1 (de) |
CN (1) | CN1114755C (de) |
BR (1) | BR9908092A (de) |
CA (1) | CA2321501A1 (de) |
DE (2) | DE19807215C2 (de) |
ES (1) | ES2183580T3 (de) |
WO (1) | WO1999042717A1 (de) |
Families Citing this family (11)
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 (de) * | 2003-05-13 | 2004-11-17 | Haldor Topsoe A/S | Verfahren für eine kontrollierte Beigabe eines Reduktionsmittels in ein stickstoffoxidhaltiges Abgas |
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 |
WO2012047193A1 (en) * | 2010-10-04 | 2012-04-12 | International Engine Intellectual Property Company, Llc | Diagnostics for hydrocarbon injection for filter regeneration |
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 |
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 (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 |
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/de not_active Expired - Fee Related
-
1999
- 1999-01-18 BR BR9908092-3A patent/BR9908092A/pt not_active IP Right Cessation
- 1999-01-18 US US09/622,696 patent/US7050902B1/en not_active Expired - Lifetime
- 1999-01-18 EP EP99934326A patent/EP1056942B1/de not_active Expired - Lifetime
- 1999-01-18 JP JP2000532632A patent/JP2002504648A/ja active Pending
- 1999-01-18 CA CA002321501A patent/CA2321501A1/en not_active Abandoned
- 1999-01-18 WO PCT/DE1999/000100 patent/WO1999042717A1/de active IP Right Grant
- 1999-01-18 ES ES99934326T patent/ES2183580T3/es not_active Expired - Lifetime
- 1999-01-18 DE DE59902462T patent/DE59902462D1/de not_active Expired - Lifetime
- 1999-01-18 CN CN99801878A patent/CN1114755C/zh not_active Expired - Lifetime
- 1999-01-18 KR KR1020007009093A patent/KR100687960B1/ko not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2321501A1 (en) | 1999-08-26 |
KR100687960B1 (ko) | 2007-02-27 |
KR20010041056A (ko) | 2001-05-15 |
DE59902462D1 (de) | 2002-10-02 |
EP1056942A1 (de) | 2000-12-06 |
DE19807215A1 (de) | 1999-08-26 |
US7050902B1 (en) | 2006-05-23 |
CN1114755C (zh) | 2003-07-16 |
DE19807215C2 (de) | 2000-06-08 |
ES2183580T3 (es) | 2003-03-16 |
JP2002504648A (ja) | 2002-02-12 |
BR9908092A (pt) | 2000-10-31 |
WO1999042717A1 (de) | 1999-08-26 |
CN1287591A (zh) | 2001-03-14 |
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