DE3127038C2 - - Google Patents
Info
- Publication number
- DE3127038C2 DE3127038C2 DE19813127038 DE3127038A DE3127038C2 DE 3127038 C2 DE3127038 C2 DE 3127038C2 DE 19813127038 DE19813127038 DE 19813127038 DE 3127038 A DE3127038 A DE 3127038A DE 3127038 C2 DE3127038 C2 DE 3127038C2
- Authority
- DE
- Germany
- Prior art keywords
- limit current
- air
- output signal
- current
- fuel ratio
- 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
- 239000000523 sample Substances 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 1
- 238000011156 evaluation Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 208000001431 Psychomotor Agitation Diseases 0.000 description 1
- 206010038743 Restlessness Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D41/1408—Dithering techniques
-
- 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
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
-
- 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
- F02D2041/286—Interface circuits comprising means for signal processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Die Erfindung betrifft ein Verfahren mit den Merkmalen des Ober begriffs des Patentanspruches. Ein derartiges Verfahren ist in der DE-OS 29 46 440 beschrieben. Es dient der Gewinnung einer präziseren Steuergröße für die Regelung des Luft-Kraftstoff-Verhältnisses des Betriebsgemisches von Brennkraftmaschinen, indem an eine Grenzstrom sonde, wie sie z. B. aus der DE-OS 27 11 880 bekannt ist, eine korri gierte Meßspannung angelegt wird. Zur Basis-Meßspannung U 0 wird eine variable Spannung Δ U addiert, die vom Lambda-Wert abhängt, so daß die korrigierte Meßspannung stets im mittleren Bereich der Strom- Spannungs-Kurve liegt und daher auch bei großen Änderungen des Lambda-Wertes der entsprechende Grenzstrom präzise erfaßt wird.The invention relates to a method with the features of the generic term of the claim. Such a method is described in DE-OS 29 46 440. It is used to obtain a more precise control variable for regulating the air-fuel ratio of the operating mixture of internal combustion engines by probing at a limit current, as z. B. is known from DE-OS 27 11 880, a corrected measuring voltage is applied. To the base voltage U 0 is a variable voltage Δ U is added, which depends on the lambda value so that the corrected measured voltage is always located in the central region of the current-voltage curve, and therefore, even for large changes in the lambda value of the corresponding current limit is precisely recorded.
Nach dem Verfahren der DE-OS 29 46 440 wird der Sauerstoffgehalt im Abgas gemessen. Es werden stationäre Grenzstromwerte, die jeweils einem bestimmten Sauerstoffgehalt entsprechen, als Steuergröße für die Regelung des Luft-Brennstoff-Verhältnisses von Brennkraftmaschinen erfaßt.According to the process of DE-OS 29 46 440, the oxygen content in Exhaust gas measured. There are stationary limit current values, each correspond to a certain oxygen content, as a control variable for the Regulation of the air-fuel ratio of internal combustion engines detected.
Ausgehend vom Stand der Technik liegt der Erfindung die Aufgabe zugrunde, Nichtgleichgewichtszustände (unverbrannte Komponenten) auf eine einfache Weise, unter Verwendung der Grenzstromsonde, zu minimieren. Diese Aufgabe wird durch das erfin dungsgemäße Verfahren dadurch gelöst, daß dynamische Signale der Grenzstromsonde erfaßt werden und die Amplitude der Stromspitzen des Ausgangssignals der Grenzstromsonde auf einem Minimum gehalten wird, das einem Miniumum von Nichtgleichgewichtszuständen entspricht.The object of the invention is based on the prior art underlying, non-equilibrium states (unburned components) an easy way using the Limit current probe, to minimize. This task is invented by the method according to the invention solved in that dynamic signals of Limit current probe can be detected and the amplitude of the current peaks of the Output signal of the limit current probe is kept to a minimum, which corresponds to a minimum of non-equilibrium states.
Bei laufendem Motor erreicht nach Öffnen des Auslaßventils eine im Auspuffsystem des Motors hinter diesem Auslaßventil angebrachte Grenz stromsonde eine Druck-Konzentrationswelle der Gasmischung des ver brannten Zylinderinhalts. Die unter Grenzstrombedingungen betriebene Sonde zeigt dann einen dem Sauerstoffgehalt proportionalen Grenzstrom an. Überraschenderweise hat sich gezeigt, daß nichtverbrannte Anteile, wie sie bei Betriebszuständen nahe der Laufgrenzen und des λ = 1-Punk tes vorkommen, von der Grenzstromsonde bei dieser Anordnung nicht mit der gleichen Geschwindigkeit zur Einstellung des thermodynamischen Gleichgewichtes gebracht werden, wie die Diffusion zur Elektrode und die elektrochemische Umsetzung erfolgt, d.h. die Geschwindigkeit zur Gleichgewichtseinstellung ist kleiner als die Geschwindigkeit der Diffusion des Gemisches zur Elektrode und der elektrochemischen Um setzung. Solche Betriebszustände sind identisch mit erhöhten CO-, CH- und C-Gehalten, wie sie im Auspuffsystem bei kleineren als den optimalen Lambda-Werten gefunden werden. Ein solcher Betriebszustand äußert sich in einer mehr oder weniger starken Unruhe des fließenden Stromes. Durch die Analyse der Amplitude der Stromspitzen einer der artigen Grenzstromsonde läßt sich daher ein Signal gewinnen, das uner wünschte Betriebszustände des Verbrennungsmotors, vorzugsweise des Dieselmotors, anzeigt, die bei kleineren als den optimalen Lambda-Wer ten liegen. Dieses Wechselstromsignal wird nun erfindungsgemäß für die Einregelung der optimalen Lambda-Werte verwendet, indem seine Amplitu de auf einem Minimum gehalten wird.When the engine is running, a limit current probe attached in the exhaust system of the engine behind this exhaust valve reaches a pressure-concentration wave of the gas mixture of the burned cylinder content. The probe operated under limit current conditions then indicates a limit current proportional to the oxygen content. Surprisingly, it has been shown that unburned portions, such as occur in operating conditions close to the running limits and the λ = 1 point, are not brought by the limit current probe in this arrangement to the setting of the thermodynamic equilibrium as the diffusion to the electrode and the electrochemical conversion takes place, ie the rate of equilibrium is less than the rate of diffusion of the mixture to the electrode and the electrochemical conversion. Such operating conditions are identical to increased CO, CH and C contents, such as those found in the exhaust system with lambda values that are lower than the optimal values. Such an operating state manifests itself in a more or less severe restlessness of the flowing current. By analyzing the amplitude of the current peaks of such a limit current probe, a signal can be obtained which indicates undesired operating states of the internal combustion engine, preferably the diesel engine, which are lower than the optimum lambda values. This alternating current signal is now used according to the invention for regulating the optimal lambda values by keeping its amplitude de to a minimum.
Dies gilt zunächst vorzugweise für Dieselmotoren ohne Abgasrück führung; es hat sich jedoch gezeigt, daß das Verfahren auch für Dieselmotoren mit Abgasrückführung eingesetzt werden kann, da auch bei diesen Dieselmotoren der Beginn unvollständiger Verbrennung bei er höhter Abgasrückführung mit Hilfe des beschriebenen Effektes erkannt werden kann. Dadurch wird eine optimale Einregelung der Abgasrück führung möglich.This applies primarily to diesel engines without exhaust gas return guide; However, it has been shown that the method also for Diesel engines with exhaust gas recirculation can also be used because the beginning of incomplete combustion in these diesel engines increased exhaust gas recirculation with the help of the described effect can be. This ensures optimal regulation of the exhaust gas return leadership possible.
In einem Dieselmotor wird im Abgasrohr hinter dem Auslaßventil eine mit einer Meßspannung beaufschlagte Grenzstromsonde eingebaut, wie sie beispielsweise aus der DE-OS 27 11 880 bekannt ist. Der Sondenstrom wird einem nicht zur Erfindung gehörenden Regelgerät zugeführt, welches gleichzeitig Amplitude und Häufigkeit der Stromspitzen registriert und in einen Lambda-Wert umsetzt. Das Regelgerät ist so aufgebaut, daß die Amplitude der Stromspitzen des Ausgangssignals minimal gehalten wird und damit ein optimaler Lambda-Wert eingestellt wird.In a diesel engine, one is in the exhaust pipe behind the exhaust valve installed with a measuring voltage limit current probe as they is known for example from DE-OS 27 11 880. The probe stream is fed to a control device not belonging to the invention, which simultaneously amplitude and frequency of the current peaks registered and converted into a lambda value. The control device is like this built that the amplitude of the current peaks of the output signal is kept to a minimum and thus an optimal lambda value is set becomes.
Das Ausgangssingal der Grenzstromsonde wird mit so hoher Geschwindig keit ausgegeben, daß sogar Verbrennungsvorgänge in einzelnen Zylindern registriert und zur Regelung herangezogen werden könnnen.The output signal of the limit current probe becomes so fast speed that even combustion processes in individual cylinders can be registered and used for regulation.
Claims (1)
- - Erfassen und Auswerten der bei unvollständiger Verbrennung des Gemisches auftretenden Stromspitzen des Ausgangssignals der Grenzstromsonde und
- - Regeln des Luft-Brennstoff-Verhältnisses derart, daß die Amplitude der Stromspitzen des Ausgangssignals der Grenz stromsonde auf einem Minimum gehalten wird.
- - Detection and evaluation of the current peaks of the output signal of the limit current probe and occurring when the mixture is incomplete combustion
- - Regulation of the air-fuel ratio such that the amplitude of the current peaks of the output signal of the limit current probe is kept to a minimum.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813127038 DE3127038A1 (en) | 1981-07-09 | 1981-07-09 | Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines |
| JP11875682A JPS5815736A (en) | 1981-07-09 | 1982-07-09 | Method of avoiding unbalance state of exhaust gas of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813127038 DE3127038A1 (en) | 1981-07-09 | 1981-07-09 | Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3127038A1 DE3127038A1 (en) | 1983-01-20 |
| DE3127038C2 true DE3127038C2 (en) | 1990-02-01 |
Family
ID=6136451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19813127038 Granted DE3127038A1 (en) | 1981-07-09 | 1981-07-09 | Method for avoiding states of non-equilibrium in the exhaust gases of internal combustion engines |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5815736A (en) |
| DE (1) | DE3127038A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3705972A1 (en) * | 1987-02-25 | 1988-09-08 | Audi Ag | CONTROL DEVICE FOR A DIESEL INTERNAL COMBUSTION ENGINE |
| DE4009167A1 (en) * | 1990-03-22 | 1991-09-26 | Electro Nite | SAMPLER FOR METAL MELTING |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2711880C2 (en) * | 1977-03-18 | 1985-01-17 | Robert Bosch Gmbh, 7000 Stuttgart | Polarographic probe for measuring oxygen concentration and process for its manufacture |
| DE2946440A1 (en) * | 1979-11-17 | 1981-05-27 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR OBTAINING A CONTROL SIZE FOR REGULATING THE FUEL-AIR RATIO OF INTERNAL COMBUSTION ENGINES |
-
1981
- 1981-07-09 DE DE19813127038 patent/DE3127038A1/en active Granted
-
1982
- 1982-07-09 JP JP11875682A patent/JPS5815736A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3127038A1 (en) | 1983-01-20 |
| JPS5815736A (en) | 1983-01-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8125 | Change of the main classification |
Ipc: F02D 41/14 |
|
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8320 | Willingness to grant licenses declared (paragraph 23) | ||
| 8339 | Ceased/non-payment of the annual fee |