EP0889217B1 - Verfahren zur Steuerung der Ansaugluftmenge eines Verbrennungsmotors - Google Patents
Verfahren zur Steuerung der Ansaugluftmenge eines Verbrennungsmotors Download PDFInfo
- Publication number
- EP0889217B1 EP0889217B1 EP98111478A EP98111478A EP0889217B1 EP 0889217 B1 EP0889217 B1 EP 0889217B1 EP 98111478 A EP98111478 A EP 98111478A EP 98111478 A EP98111478 A EP 98111478A EP 0889217 B1 EP0889217 B1 EP 0889217B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lean
- des
- load
- engine
- air
- 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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
Definitions
- the invention relates to a method for controlling the amount of intake air of an internal combustion engine with an operating mode with an essentially stoichiometric air / fuel mixture and an operating mode with a lean air / fuel mixture, the internal combustion engine being an electronic one Motor control has that as an input signal receives at least the signal of an accelerator pedal position sensor and the at least one manipulated value for a throttle valve actuator to influence the amount of intake air calculated, and the engine control device to decide whether the engine is stoichiometric or lean is operated.
- Lean operation must approximate the amount of air supplied constant fuel supply can be increased.
- the electronic engine control must control the amount of air supplied can influence what is convenient about a electronically controllable throttle valve happens.
- the throttle position should be adjusted when switching modes that the torque of the engine is essentially remains constant so that none of the driver of the internal combustion engine motor vehicle having perceptible speed or change in acceleration occurs.
- a disadvantage of the known proposed solutions is the relative one high hardware and software expenditure in the electronic motor control, which is necessary for a mathematical model that the current engine torque from a variety of engine operating parameters calculated. Also the development effort considerably and the adaptation to changed vehicle types complex. Problems also arise with known methods when switching modes during load change reactions (e.g. during accelerations), so that in the known Often a stoichiometric-lean mode change procedure is allowed if the engine operating conditions for a specified time (e.g. one second) are constant. This leads to a shorter operating time of the engine in lean mode and thus a deteriorated fuel economy.
- EP 0 687 809 A2 describes an embodiment of a motor control known ( Figure 10), in which from the accelerator pedal position and the engine speed using a first A desired engine torque is determined. This desired engine torque and engine speed will be then used to determine the amount of fuel, the air mass flow and adjust the ignition angle setting. Doing so with the help of a classification table to the desired one Engine torque and engine speed appropriate Air / fuel ratio set. For each so selectable Air / fuel ratio is also an associated one Map available from the desired engine torque and the engine speed the opening angle to be set the throttle valve can be read.
- a disadvantage of this method is that the air / fuel ratio only can be set in discrete steps and that for each of these steps has its own map for the one to be set Opening angle must be kept ready.
- the object of the present invention is a to create an improved process of the type mentioned at the outset, with the least possible hardware and software expenditure the air volume is adjusted when the mode is switched, that the engine torque is essentially constant remains and in which the mode switch at any time - also with load changes - can take place.
- step a) is based on a map with at least the Accelerator pedal position as desired map input variable Air mass value des_load determined.
- Maps also - around a one- or multi-dimensional table memory or a mathematical function of the map input variables act.
- the variable des_load represents approximately in the stoichiometric operating mode an air mass value to reach the at the current accelerator pedal position desired engine torque. In doing so, engine parameters such as. the exhaust gas recirculation rate and the ignition angle setting, which have only a relatively minor influence have the engine torque when determining des_load be ignored.
- step b) des_load with the desired lean air / fuel ratio des_lean_lambda multiplied, the value of which is determined using a map becomes.
- des_load with the desired lean air / fuel ratio des_lean_lambda multiplied, the value of which is determined using a map becomes.
- des_lean_load you go into the map according to step c).
- steps a) to c) additionally the engine speed used as an independent map input variable becomes.
- the lean determined during lean operation Air / fuel ratio des_lean_lambda before multiplication with des_load in step b) with an additional factor eta_eng is multiplied, the approximate ratio between engine efficiency in lean operation the motor efficiency in stoichiometric operation at each corresponds to the same fuel supply, whereby eta_eng based on a map with at least des_load and the engine speed is determined as a map input variable.
- the efficiency of the engine with the same fuel supply improved during the transition to lean operation typically by approx. 10%
- the engine torque would be lean compared to stoichiometric operation with the same Increase fuel supply by this ratio.
- a abrupt change in this factor occurs when switching modes stoichiometric-lean or vice versa. Around To avoid unwanted engine reactions, these can sudden changes due to the electronic filter element be dampened.
- fast temporal variations of the signal des_load by another electronic filter element can be damped. With that rapid accelerator movements dampened to unwanted Avoid engine reactions in the event of extreme load changes.
- step b) one of an electronic Idle speed control determined idle air mass value add isc_load to give the motor the required Supply air mass for idle operation.
- a further embodiment of the invention can be provided be that from the output signal one in the intake system of the Combustion engine arranged air mass flow sensor actual air mass value load is calculated, and that des_lean_load based on the difference between load and des_lean_load is corrected.
- This correction can preferably done by a PI controller that acts as an input signal receives the difference between des_lean_load and load and its output value then the signal des_lean_load is additively superimposed. That way you can Deviations between actual and desired Air mass values, e.g. due to neglect the influence of intake air temperature and air pressure occur, are compensated.
- the desired lean air / fuel ratio des_lean_lambda subtracts an offset value is based on a map depending on the cooling water temperature is determined such that when the engine is cold lower and higher with a warm internal combustion engine Air / fuel ratios can be set. To this Way it can be considered that the maximum possible Air / fuel ratio in lean operation with the engine cold is lower than with a warm engine.
- intake air control can determine the amount of fuel to be injected by injection actuators from the electronic engine control advantageously based on the measured value of one in the intake system of the internal combustion engine arranged air mass flow sensor and in Lean operation based on the desired air / fuel ratio des_lean_lambda (see step b)) is calculated become.
- the desired Air / fuel ratio based on the value 1.0.
- the Fuel control is therefore preferably not based on the one calculated by the intake air control Air mass value, but based on an air mass flow sensor measured actual air mass value.
- An advantage of the present invention is that only a few arithmetic and map operations for intake air calculation are required so that the hardware and software expenditure can be minimized.
- the in the inventive Processes used with proportional maps low development effort can be determined. So the map in step a) is essentially by the Accelerator pedal characteristic, the map in step b) by the Lean operating behavior of the engine and the map in Step c) through the flow characteristics of the intake system certainly. When changing these parameters (e.g. Installation of a modified throttle valve) only has to corresponding map can be adjusted.
- Another advantage of the method is that the intake air calculation reliable in all engine operating conditions works so that mode switching even under load change reactions are feasible. This can in extreme cases several times per second between lean and stoichiometric Operation can be switched back and forth and thus the fuel savings can be maximized by the lean operation.
- An electronic engine control one not shown Multi-cylinder internal combustion engine with electronically controlled Throttle valve has a microprocessor, not shown with an assigned RAM, and a read-only memory ROM as well as a variety of digital and analog Input and output ports.
- the microprocessor performs accordingly 1 quasi-simultaneous routines for fuel control 2, to the intake air control 4 and the ignition control 6.
- all routines can receive a variety of other input signals, such as. Engine temperature, crankshaft angle, condition values emission control etc. These are input signals for the sake of clarity indicated with ...
- a routine 8 the engine control system is dependent on the current engine operating parameters decided whether the internal combustion engine in lean mode or in stoichiometric mode to be operated.
- the current mode is determined by the routine 8 indicated by the binary lean_run_flag.
- the air control 4 receives via the output signal pp (pedal position) of an accelerator pedal potentiometer the current torque request of the driver.
- a desired pedal position and engine speed Air mass value des_load calculated which is then the ignition control 6 and the mode controller 8 is supplied.
- the value of the load thus calculated and the engine speed n are the main parameters that determine the respective engine operating status characterize.
- the air control 4 calculates a desired control value for the throttle valve actuator des_tp (desired throttle position), which is a throttle valve actuator 12 with an electric motor for movement the throttle valve and a position controller to control the Throttle position is supplied.
- Air control 4 further calculates a desired lean air / fuel ratio des_lean_lambda that the fuel control 2 is supplied.
- the fuel control 2 continues to receive the signal maf an air mass flow sensor arranged in the air intake system 16 as well as the engine speed. From these input signals the required fuel injection quantity is calculated and by pulse width modulation of the injection pulses on injection actuators 10 issued.
- the ignition controller 6 determines a plurality of Input signals such as des_load, the engine speed n and depending on the current mode (lean_run_flag) the respective optimal ignition times that are delivered to the ignition system 14 be passed on.
- FIG. 2 shows the mode of operation of an intake air control method according to the invention shown.
- a desired air mass value ds_ld determined approximately in the stoichiometric operating mode an air mass value for the desired engine torque represents.
- the value ds_ld becomes - like that other air mass variables also - expediently on the at the respective speed, the maximum possible air mass flow normalized when the throttle valve is fully open (relative Air mass value).
- the transient behavior of ds_ld is controlled by an electronic Filter member 42 dampened to avoid undesirable engine reactions to avoid under extreme load changes.
- an air mass value of the idle speed control isc_load added.
- the air mass value calculated in this way is called des_load.
- des_lean_load designated air mass value based on a two-dimensional Map 50 with des_lean_load and the engine speed n as a map input variable in a manipulated variable implemented for the throttle valve actuator des_tp, the is then implemented by the throttle valve actuator.
- the map is chosen so that des_tp becomes an approximation des_lean_load corresponding intake air quantity leads.
- the Map 50 describes the flow characteristics of the air intake system. If in the air intake system either in operative position bringable facilities are available that the Change flow characteristics in the intake system (e.g. one So-called swirl control valve) are expedient to provide different maps 50.
- the value des_load is at multiplication point 48 with the Factor 1.0 multiplied if by using lean_run_flag stoichiometric operation is specified (position 56 of the schematic switch 54).
- lean operation is against via a two-dimensional map 64 depending on the Map input variables des_load and engine speed n a desired lean air / fuel ratio des_lean_lambda determined.
- the map values for des_lean_lambda are determined in test series so that the engine is operated as lean as possible, without uneven running to show.
- the value of the_lean_lambda is below at a multiplication point 60 with an engine efficiency ratio multiplied by eta_eng the change in engine efficiency at the transition between Operating modes lean and stoichiometric is compensated.
- the Value eta_eng is based on a two-dimensional map 62 depending on the map input variables des_load and the engine speed n is determined.
- the uncorrected value des_lean_lambda is also sent to fuel control 2 passed on and in lean operation to calculate the required Amount of fuel used for a given air mass flow. By multiplying des_load by 48 in lean operation the air mass flow is adjusted so that the engine torque essentially constant when switching modes remains. To avoid unwanted engine reactions, are rapid changes in the time factor with which des_load is multiplied at 48 by means of an electronic Filter member 52 damped.
- FIG. 3 is a modified embodiment of the invention shown.
- the mode of action is essentially corresponding to the intake air control shown in Fig. 2.
- Fig. 2 there is also the fact that des_lean_load corrected a measured actual air mass value load becomes.
- the value load is derived from the measured value in the intake system arranged air mass flow sensor determined. On this way, discrepancies between actual and desired air mass values, e.g. due to neglect the influence of intake air temperature and of air pressure can be compensated.
- From the sizes load and des_lean_load becomes a difference signal at 72 formed that a suitably tuned proportional / integral controller (PI controller) is supplied.
- PI controller proportional / integral controller
- des_lean_lambda at 80 through an offset value is modified based on a map 82 depending on the cooling water temperature ect (engine coolant tepmerature) is determined so that when cold Engine lower and higher with a warm internal combustion engine Air / fuel ratios can be set.
- ect engine coolant tepmerature
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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Description
- Fig.
- 1 eine stark schematisierte Darstellung des Zusammenspiels der Komponenten einer elektronischen Motorsteuerung im Rahmen der vorliegenden Erfindung,
- Fig. 2
- ein schematische Darstellung des erfindungsgemäßen Verfahrens zur Ansaugluftsteuerung,
- Fig. 3
- eine schematische Darstellung einer modifizierten Ausführungsform des erfindungsgemäßen Verfahrens.
Claims (9)
- Verfahren zur Steuerung der Ansaugluftmenge eines Verbrennungsmotors mit einem Betriebsmodus mit einem im wesentlichen stöchiometrischen Luft-/Kraftstoffgemisch und einem Betriebsmodus mit magerem Luft-/Kraftstoffgemisch, wobei der Verbrennungsmotor eine elektronische Motorsteuerung aufweist, die als Eingangssignal wenigstens das Signal eines Gaspedalstellungssensors (18) erhält und die als Ausgangssignal wenigstens einen Stellwert für einen Drosselklappen-Aktuator (12) zur Beeinflussung der Ansaugluftmenge berechnet, und die Motorsteuerung eine Entscheidungseinrichtung (8) zur Entscheidung, ob der Motor stöchiometrisch oder mager betrieben wird, aufweist, gekennzeichnet durch die folgenden Schritte:a) Bestimmen eines gewünschten Luftmassenwertes des_load, der im stöchiometrischen Betriebsmodus näherungsweise einen Luftmassenwert für das gewünschte Motordrehmoment repräsentiert, wobei die Bestimmung anhand eines Kennfeldes (40) mit wenigstens der Gaspedalstellung als Kennfeldeingangsvariabler erfolgt,b) in Abhängigkeit von dem durch die Entscheidungseinrichtung (8) vorgegebenen Betriebsmodus: im Magermodus Bestimmen eines gewünschten mageren Luft/Kraftstoffverhältnisses des_lean_lambda anhand eines Kennfeldes (64) mit wenigstens des_load als Kennfeldeingangsvariabler, und multiplizieren von des_load mit dem Faktor des_lean_lambda zu einem Produkt des_lean_load, oder, im stöchiometrischem Modus Multiplikation von des_load mit dem Faktor 1,0 zu dem Produkt des_lean_load, undc) Bestimmen eines Stellwerts für den Drosselklappen-Aktuator (12), wobei die diesem Stellwert entsprechende Drosselklappenstellung zu einer näherungsweise des_lean_load entsprechenden Ansaugluftmenge führt, anhand eines Kennfeldes (50) mit wenigstens des_lean_load als Kennfeldeingangsvariabler und Einstellung der Drosselklappe anhand des so bestimmten Stellwertes.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in den Schritten a) bis c) zusätzlich die Motordrehzahl als unabhängige Kennfeldeingangsvariable benutzt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei Magerbetrieb das ermittelte magere Luft/Kraftstoffverhältnis des_lean_lambda vor der Multiplikation mit des_load in Schritt b) zusätzlich mit einem Faktor eta_eng multipliziert wird, der näherungsweise dem Verhältnis zwischen dem Motorwirkungsgrad im Magerbetrieb zu dem Motorwirkungsgrad im stöchiometrischen Betrieb bei jeweils gleicher Kraftstoffzufuhr entspricht, wobei eta_eng anhand eines Kennfeldes (62) mit wenigstens des_load und der Motordrehzahl als Kennfeldeingangsvariablen bestimmt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß schnelle zeitliche Variationen des Faktors, mit dem in Schritt b) des_load multipliziert wird, durch ein elektronisches Filterglied (52) gedämpft werden.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zu dem Wert des_load vor der Multiplikation in Schritt b) ein von einer elektronischen Leerlaufdrehzahlregelung (44) bestimmter Leerlaufluftmassenwert isc_load addiert wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß aus dem Ausgangssignal eines im Einlaßsystem des Verbrennungsmotors angeordneten Luftmassenstromsensors (16) ein tatsächlicher Luftmassenwert load berechnet wird, und daß des_lean_load anhand der Differenz zwischen load und des_lean_load korrigiert wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Korrektur durch ein PI-Regelglied (70) erfolgt, das als Eingangssignal die Differenz zwischen des_lean_load und load erhält und dessen Ausgangswert anschließend dem Signal des_lean_load additiv überlagert wird.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß bei Magerbetrieb in Schritt b) von dem gewünschten mageren Luft-/Kraftstoffverhältnis des_lean_lambda ein Offsetwert subtrahiert wird, der anhand eines Kennfeldes (82) abhängig von der Kühlwassertemperatur derart bestimmt wird, daß bei kaltem Motor niedrigere und bei warmem Verbrennungsmotor höhere Luft/Kraftstoffverhältnisse eingestellt werden.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die elektronische Motorsteuerung eine Einrichtung (2) zur Steuerung der Kraftstoffeinspritzmenge aufweist, die als Eingangssignal wenigstens den Meßwert eines im Einlaßsystem des Verbrennungsmotors angeordneten Luftmassenstromsensors (16) und das gewünschte Luft-/Kraftstoffverhältnis des_lean_lambda im Magerbetrieb erhält und als Ausgangssignal einen der einzuspritzenden Kraftstoffmenge entsprechenden Wert zur Ansteuerung der Einspritz-Aktuatoren (10) berechnet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19728798A DE19728798C2 (de) | 1997-07-05 | 1997-07-05 | Verfahren zur Steuerung der Ansaugluftmenge eines Verbrennungsmotors |
DE19728798 | 1997-07-05 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0889217A2 EP0889217A2 (de) | 1999-01-07 |
EP0889217A3 EP0889217A3 (de) | 2000-05-10 |
EP0889217B1 true EP0889217B1 (de) | 2003-09-03 |
Family
ID=7834778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98111478A Expired - Lifetime EP0889217B1 (de) | 1997-07-05 | 1998-06-23 | Verfahren zur Steuerung der Ansaugluftmenge eines Verbrennungsmotors |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0889217B1 (de) |
JP (1) | JPH1172034A (de) |
DE (2) | DE19728798C2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10257061A1 (de) * | 2002-12-06 | 2004-06-24 | Adam Opel Ag | Kraftfahrzeug mit einem Verbrennungsmotor |
DE102017111080A1 (de) | 2017-05-22 | 2017-07-20 | FEV Europe GmbH | Umschaltverfahren eines verbrennungsmotors zwischen magerem und stöchiometrischen motorbetrieb |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2529178C2 (de) * | 1975-07-01 | 1986-08-07 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und Anordnung zur Regelung des einer Brennkraftmaschine zugeführten Kraftstoff-Luft-Gemisches |
JPS5970853A (ja) * | 1982-10-18 | 1984-04-21 | Hitachi Ltd | 自動車用エンジンの制御装置 |
JPS59208141A (ja) * | 1983-05-12 | 1984-11-26 | Toyota Motor Corp | 電子制御エンジンの空燃比リ−ン制御方法 |
DE4416611A1 (de) * | 1994-05-11 | 1995-11-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
EP0687809B1 (de) * | 1994-06-17 | 2001-08-29 | Hitachi, Ltd. | Ausgangsdrehmoment-Steuerungsvorrichtung und Verfahren für eine Brennkraftmaschine |
US5787380A (en) * | 1995-10-27 | 1998-07-28 | Ford Global Technologies, Inc. | Air/fuel control including lean cruise operation |
US5666918A (en) * | 1995-12-11 | 1997-09-16 | Ford Motor Company | Engine airflow controller with feedback loop compensation for changes in engine operating conditions |
JPH09287513A (ja) * | 1996-02-23 | 1997-11-04 | Nissan Motor Co Ltd | エンジンのトルク制御装置 |
US5931138A (en) * | 1996-02-23 | 1999-08-03 | Nissan Motor Co., Ltd. | Engine torque control apparatus |
-
1997
- 1997-07-05 DE DE19728798A patent/DE19728798C2/de not_active Expired - Fee Related
-
1998
- 1998-06-23 EP EP98111478A patent/EP0889217B1/de not_active Expired - Lifetime
- 1998-06-23 DE DE59809455T patent/DE59809455D1/de not_active Expired - Lifetime
- 1998-07-02 JP JP10204277A patent/JPH1172034A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0889217A3 (de) | 2000-05-10 |
DE59809455D1 (de) | 2003-10-09 |
DE19728798C2 (de) | 2003-10-30 |
DE19728798A1 (de) | 1999-03-18 |
JPH1172034A (ja) | 1999-03-16 |
EP0889217A2 (de) | 1999-01-07 |
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