EP0848151B1 - Verfahren zur Regelung des Kraftstoff-Luft-Verhältnisses einer Brennkraftmaschine - Google Patents
Verfahren zur Regelung des Kraftstoff-Luft-Verhältnisses einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP0848151B1 EP0848151B1 EP97120602A EP97120602A EP0848151B1 EP 0848151 B1 EP0848151 B1 EP 0848151B1 EP 97120602 A EP97120602 A EP 97120602A EP 97120602 A EP97120602 A EP 97120602A EP 0848151 B1 EP0848151 B1 EP 0848151B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lambda probe
- lambda
- control loop
- probe
- control
- 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
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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
- F02D41/02—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
- F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
- F02D41/1483—Proportional component
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
Definitions
- the invention relates to a method for regulating the fuel-air ratio an internal combustion engine after Feature of the preamble of claim 1.
- Control devices are used to achieve the most pollutant-free exhaust gases known for internal combustion engines in which the Oxygen content in the exhaust duct is measured and evaluated.
- Oxygen measuring probes so-called lambda probes, are known for this purpose, the z. B. on the principle of ion conduction by a Solid electrolytes due to an oxygen partial pressure difference work and according to the existing in the exhaust gas Oxygen partial pressure emit a voltage signal that at Transition from lack of oxygen to excess oxygen or the other way round has a voltage jump.
- the output signal of the lambda probe is controlled by a controller evaluated, which in turn controls the fuel-air mixture adjusts.
- the invention is therefore based on the object of a method specify which is an accurate and adaptable scheme enables, so the air-fuel ratio in the sense a reduction in exhaust gas emissions is further improved.
- the advantage of the invention is a quick feedback of the output signal of the second lambda control loop on the control loop of the first lambda probe by changing the voltage jump of the output signal of the first lambda probe.
- the P component of the first control loop is thus determined by a Correction value affects which of the actually ongoing Period of the output signal of the first lambda probe is dependent.
- the correction signal is multiplicative on the P component of the control loop of the first lambda probe the P component of the control loop is strengthened or weakened.
- the correction signal becomes dependent the air mass flow and / or the ratio of Amplitude of the second lambda probe to the amplitude of the first Lambda probe formed.
- the efficiency of the catalyst is determined by the amplitude ratio taken into account when correcting the first control loop.
- the amplitude of both the first and the second lambda probe is done by discrete samples of the output signal each Lambda probe determined, from within the scan a mean value is formed from a time window which the amplitude ratio is determined.
- the correction signal is advantageously dependent from the sign of the control deviation of the second lambda control loop weighted.
- the device consists of an internal combustion engine 1 a catalyst 2. Air is supplied to the engine 1 via an intake manifold 3.
- the fuel is injected into the intake manifold 3 via injection valves 4.
- Lambda sensors 5 and 6 measure the respective lambda value of the exhaust gas before and after the Catalyst 2. Both signals supplied by lambda sensors 5 and 6 are led to a controller with PI characteristic 8, which is usually in Control device (Fig. 2) is arranged in the motor vehicle.
- the controller 8 uses setpoints to form an actuating signal, which is fed to the injection valves 4.
- This control signal leads to a change in the fuel metering, which a certain lambda value together with the intake air mass of the exhaust gas.
- the controller 8 is, as shown in Fig. 2, a microcomputer consisting of a central processor unit CPU a RAM and a Read-only memory ROM.
- the controller 8 evaluates both the signals of the first lambda probe 5 and the signals of the second lambda probe 6 from which are fed and processed via its input / output unit I / 0 this further.
- the controller 8 evaluates the signal of the first lambda probe 5 by: the current value with a setpoint 9 stored in the memory ROM for the Lambda probe 5 compares and determines an injection time as a manipulated variable which regulates the fuel-air mixture. This comparison the evaluation of the second lambda control loop is superimposed as in 4 will be explained in detail in connection with FIG. The result of the second lambda control loop is represented in the determination of the Holding time TH. This hold time TH causes the action of the controller 8th on the injection valves 4 which, depending on the comparison of the first Control loop takes place, is delayed.
- the controlled system 11 is the combustion process in the engine 1 which via the injection time as a manipulated variable and the injectors as actuators is controlled.
- Each lambda sensor delivers the respective fuel-air mixture ⁇ factor representing a waveform as shown in Figure 3 is.
- the resistance or the voltage can be above the ⁇ factor to be viewed as.
- the probe If the probe is active, it has a signal voltage that is outside of the range (ULSU, ULSO). Delivers during the lean rash the lambda probe has a minimal output signal that is below ULSU lies. A maximum voltage signal appears during the fat rash measured above ULSO in a range of 600 - 800 mV. This maximum value is subject to manufacturing tolerances and signs of aging certain scatter caused by a probe correction factor Getting corrected.
- the controlled system 11 contains the motor 1, that of the controller 8, as in FIG. 1 described, the control signal in the form of the changed injection time of the injection valves is fed.
- the lambda probe 6 arranged in the exhaust gas duct behind the catalytic converter 2 supplies a lambda value in the form of a signal voltage.
- This setpoint U 6SOLL is formed from the mean value measured by the lambda probe 6 if the lambda probe 5 arranged in front of the catalytic converter works without problems.
- the control difference formed in point 12 from the setpoint and actual value of the output signal of the second lambda probe 6 is fed to a limiter 15, which compares the amount of the control difference with a threshold value 14, which is also stored in the memory ROM of the control unit. Only if the amount of the control difference is greater than this threshold value 14, the control difference is passed to a comparator 13 which, depending on the sign of the difference between the actual value U 6IST of the second lambda probe 6 and the target value U 6SOLL of the second lambda probe 6, is a 1 or Outputs -1. Depending on this output value, a Signum integrator 16 is advanced or reset.
- the Signum integrator 16 increments when the actual value U 6IST is greater than the setpoint U 6SOLL . It decrements by 1 if the actual value U 6IST is smaller than the setpoint U 6SOLL . If both values are the same, the counter reading is not changed.
- the signum integrator 16 becomes in front of the catalytic converter with each envelope 17 arranged arranged first lambda probe 5 and is thus from this is clock controlled.
- the count value is multiplied by a proportionality constant 19 in the value of (0.5 - a few 100) ms / probe change of the first lambda probe 5, whereby an absolute holding time TH raw is determined.
- the holding time TH raw obtained in this way is evaluated in a second multiplication point 20 with a weighting factor WF, which is determined in point 23 by dividing the actually measured period 21 of the first lambda probe 5 by a constant 22.
- the constant 22 is a function of the period of the first lambda probe 5 at idle.
- the holding time TH obtained is used as a controlled variable for the controller 8 for adaptation the controlled system 11 fed.
- the controlled system 11 is supplied with a correction signal, which is formed as follows.
- the control difference of the second lambda probe formed in the sum point 12 6 is fed to a changeover switch 24, which is dependent on the sign of the signals emitted by the comparator 15 switches. Is the signal negative, a first characteristic curve 25 becomes a first characteristic curve 25 taken, the signal is positive, is switched on from a second characteristic second evaluation factor KL for the control deviation taken.
- This The evaluation factor KM or KL is in point 27 with a map 28 formed third evaluation factor KF multiplied.
- the map 28 is determined by the mean amplitude ratio value 29 of the two lambda probes 5 and 6 and the air mass flow 30 measured by the air mass meter 7 certainly.
- the characteristic value KPF formed in point 27 becomes dependent in point 31 from the probe cover 17 of the first lambda probe 5 and from the sign the control difference of the second lambda probe 6, which by the Comparator 15 is weighted.
- the correction factor KPF is weighted as follows. Work both probes 5, 6 simultaneously in the rich or simultaneously in the lean range, the correction factor KPF is increased by 1. Is the first probe working in the grease and the second probe in the lean area or vice versa, the Correction factor KPF subtracted from 1.
- the weighting factor contained in this way as a dimensionless variable, the TH is independent of the holding time Controller 8 supplied in the controlled system 11. It is like-minded Tendency of the output signal of the two lambda probes 5, 6 the P component of the controller 8 increased and decreased in the opposite direction, which leads to The consequence of this is that the second lambda control loop acts quickly and directly on the first lambda control loop.
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)
Description
- Fig. 1:
- schematische Darstellung einer Vorrichtung zur Regelung des Kraftstoff-Luft-Gemisches für eine Brennkraftmaschine
- Fig. 2:
- Steuergerät eines Kraftfahrzeuges
- Fig. 3:
- Spannungsverlauf einer Lambdasonde über dem Kraftstoff-Luft-Gemisch (λ-Faktor)
- Fig. 4:
- Regelkreis der hinter dem Katalysator angeordneten Lambdasonde
Claims (6)
- Verfahren zur Regelung des Kraftstoff-Luft-Verhältnisses einer Brennkraftmaschine, wobei das Ausgangssignal einer ersten Lambdasonde, die im Abgaskanal der Brennkraftmaschine vor einem Katalysator angeordnet ist, einem Regler zugeführt wird, welcher eine PI-Charakteristik aufweist, und der Regler eine Stellgröße für das Kraftstoff-Luft-Verhältnis abgibt und dass dem Regler ein weiteres Signal zugeführt wird, welches aus dem Ausgangssignal einer zweiten, dem Katalysator nachgeordneten Lambdasonde gewonnen wird, und auf den Regelkreis der ersten Lambdasonde einwirkt, so dass der P-Sprung des Reglers, der durch den Regelkreis der ersten Lambdasonde bestimmt wird, in Abhängigkeit des Regelkreises der zweiten Lambdasonde geändert wird, und ein Korrekturwert des zweiten Lambdaregelkreises zum Zeitpunkt des Umschlagens der vor dem Katalysator angeordneten ersten Lambdasonde gebildet wird, dadurch gekennzeichnet, dass der Korrekturwert in Abhängigkeit vom Sondenumschlag der ersten Lambdasonde und von dem Vorzeichen der Regeldifferenz der zweiten Lambdasonde gewichtet und dem Regelkreis der ersten Lambdasonde unabhängig von einer Haltezeit zugeführt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Korrekturwert aus der Regelabweichung zwischen Istwert der zweiten Lambdasonde und Sollwert der zweiten Lambdasonde gebildet wird, wobei der P-Sprung des ersten Lambdaregelkreises erhöht wird, wenn das Vorzeichen der Regelabweichung mit der Umschlagrichtung der ersten Lambdasonde übereinstimmt und der P-Sprung des ersten Lambdaregelkreises verkleinert wird, wenn das Vorzeichen der Regelabweichung der Umschlagrichtung der ersten Lambdasonde entgegengesetzt ist.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Korrektursignal in Abhängigkeit des Luftmassenstromes gebildet wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Korrektursignal in Abhängigkeit des Amplitudenverhältnisses der Amplitude der zweiten Lambdasonde zur Amplitude der ersten Lambdasonde gebildet wird.
- Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Amplitude sowohl der ersten als auch der zweiten Lambdasonde durch diskrete Abtastungen der Ausgangssignale jeder Lambdasonde bestimmt wird und aus der Abtastung innerhalb eines Zeitfensters jeweils ein Mittelwert der Amplitude jeder Lambdasonde gebildet wird, aus welchem das Amplitudenverhältnis bestimmt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Korrektursignal in Abhängigkeit von dem Vorzeichen der Regelabweichung des zweiten Lambdaregelkreises gewichtet wird.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/010,208 US6062019A (en) | 1997-11-25 | 1998-01-21 | Method for controlling the fuel/air ratio of an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19651613 | 1996-12-12 | ||
DE19651613A DE19651613C1 (de) | 1996-12-12 | 1996-12-12 | Verfahren zur Regelung des Kraftstoff-Luft-Verhältnisses einer Brennkraftmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0848151A2 EP0848151A2 (de) | 1998-06-17 |
EP0848151A3 EP0848151A3 (de) | 1999-05-12 |
EP0848151B1 true EP0848151B1 (de) | 2004-01-28 |
Family
ID=7814430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97120602A Expired - Lifetime EP0848151B1 (de) | 1996-12-12 | 1997-11-25 | Verfahren zur Regelung des Kraftstoff-Luft-Verhältnisses einer Brennkraftmaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0848151B1 (de) |
DE (2) | DE19651613C1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5848528A (en) * | 1997-08-13 | 1998-12-15 | Siemens Automotive Corporation | Optimization of closed-loop and post O2 fuel control by measuring catalyst oxygen storage capacity |
DE102006049656B4 (de) * | 2006-10-18 | 2016-02-11 | Volkswagen Ag | Lambda-Regelung mit einer Sprung-Lambda-Sonde |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3500594C2 (de) * | 1985-01-10 | 1995-08-17 | Bosch Gmbh Robert | Zumeßsystem für eine Brennkraftmaschine zur Beeinflussung des Betriebsgemisches |
JPH0612087B2 (ja) * | 1987-12-14 | 1994-02-16 | 日本電子機器株式会社 | 内燃機関の電子制御燃料噴射装置 |
JP2697251B2 (ja) * | 1990-05-28 | 1998-01-14 | 日産自動車株式会社 | エンジンの空燃比制御装置 |
DE4024210C2 (de) * | 1990-07-31 | 1999-09-02 | Bosch Gmbh Robert | Verfahren zur Lambdaregelung einer Brennkraftmaschine mit Katalysator |
US5115639A (en) * | 1991-06-28 | 1992-05-26 | Ford Motor Company | Dual EGO sensor closed loop fuel control |
JP3356878B2 (ja) * | 1994-05-09 | 2002-12-16 | 本田技研工業株式会社 | 内燃機関の空燃比制御装置 |
-
1996
- 1996-12-12 DE DE19651613A patent/DE19651613C1/de not_active Expired - Fee Related
-
1997
- 1997-11-25 EP EP97120602A patent/EP0848151B1/de not_active Expired - Lifetime
- 1997-11-25 DE DE59711258T patent/DE59711258D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0848151A3 (de) | 1999-05-12 |
EP0848151A2 (de) | 1998-06-17 |
DE19651613C1 (de) | 1998-08-06 |
DE59711258D1 (de) | 2004-03-04 |
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