EP1046802A2 - Procédé de commande d'un mélange air-carburant lors de variations dynamiques extrêmes - Google Patents

Procédé de commande d'un mélange air-carburant lors de variations dynamiques extrêmes Download PDF

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Publication number
EP1046802A2
EP1046802A2 EP00106174A EP00106174A EP1046802A2 EP 1046802 A2 EP1046802 A2 EP 1046802A2 EP 00106174 A EP00106174 A EP 00106174A EP 00106174 A EP00106174 A EP 00106174A EP 1046802 A2 EP1046802 A2 EP 1046802A2
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EP
European Patent Office
Prior art keywords
lambda control
threshold
mixture
lambda
gate
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.)
Granted
Application number
EP00106174A
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German (de)
English (en)
Other versions
EP1046802A3 (fr
EP1046802B1 (fr
Inventor
Ralf Klein
Thomas Edelmann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1046802A2 publication Critical patent/EP1046802A2/fr
Publication of EP1046802A3 publication Critical patent/EP1046802A3/fr
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Publication of EP1046802B1 publication Critical patent/EP1046802B1/fr
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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
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488—Inhibiting the regulation
    • F02D41/1489—Replacing of the control value by a constant

Definitions

  • the present invention relates to a method for Control of the air-fuel mixture one Internal combustion engine in extreme dynamic processes, one Lambda control is present.
  • Lambda is the measure of the air-fuel ratio of the cylinders of the Mixture supplied to the internal combustion engine.
  • the lambda control causes a deviation of the actual lambda value, the is measured with a lambda probe, from a lambda setpoint the amount of fuel supplied is changed so that the lambda value 1 is set.
  • the invention is therefore based on the object Specify the procedure of the type mentioned above, with which in extreme dynamic processes impairments of the Have driving behavior (e.g. jerking, misfires) avoided.
  • the lambda control it is expedient for the lambda control to be deactivated becomes, if either a high mixture enrichment also the output signal of the Lambda controller falls below an upper threshold or if in addition to the fulfilled condition of a high mixture emaciation in addition the output signal of the lambda controller is a lower one Falls below the threshold.
  • the deactivation of the lambda control due to a high Mixture enrichment is expediently canceled, if either the load gradient is below a first Threshold is or the condition of a high The mixture is lean. Deactivating the Lambda control due to a high mixture leanness then canceled when either the load gradient is above a second threshold or the condition of a high one Mixture enrichment is present.
  • the first and the second Thresholds are preferably dependent on the engine temperature.
  • the figure of the drawing shows a functional diagram for a Method for controlling the air-fuel mixture extreme dynamic processes.
  • Block 1 symbolizes a known one, not here Lambda control, whose output signal Fr1 represents a manipulated variable for fuel injection. If the internal combustion engine has two motor banks, sets the lambda control 1 for each engine bank Control variable Fr1 and Fr2 for fuel injection Available.
  • the lambda control 1 is one of the output signal B_pspaus OR gate 2 deactivated if either a high Mixture enrichment, as with a high acceleration of the vehicle occurs, or a high mixture leanness, like when the vehicle decelerates sharply occurs, is present. Deactivation of the lambda control means that the normal lambda control is overridden and the lambda value to a neutral value (e.g. 1.0) is set. The lambda control therefore no longer follows this Lambda sensor signal. This is too high an emaciation or enrichment of the mixture due to a Transient process no longer possible.
  • the OR gate 2 has two inputs ebag and evag. At the Input ebag has a logical 1 if due to a high mixture enrichment deactivates the lambda control 1 and there is a logical 1 at the input evag, if the lambda control 1 due to a high Mixture thinning should be deactivated. Under which Conditions at the inputs ebag or evag of the OR gate 2 signals with logical 1 are available To see the functional diagram. The functional diagram consists of two branches of the same structure.
  • the conditions for a deactivation of the Lambda control 1 determines, and in the second branch, the Input evag of the OR gate 2 is present, the Conditions for deactivating lambda control 1 determined on a high mixture emaciation are due.
  • the first condition is a signal B_bag, which indicates that there is a high mixture enrichment, the one Threshold exceeds.
  • This signal B_bag is on the Set input S of a flip-flop 4, so that this flip-flop 4 is set and a signal with a logical 1 on outputs an input of the AND gate 3 when the flip-flop 4 is set by the signal B_bag.
  • the second condition is that this signal B_bag, which indicates a high mixture enrichment for one specified time period is at logical 1, i.e. the height Mixture enrichment continues for the specified time.
  • the signal B_bag for the high mixture loading for the predefined time period TVUKGBM is at logical 1 for example by means of a counter 5, which lasts its counter reading increases as the signal B_bag is present.
  • the signal B_bag has the status logic 1 for as long as until the specified time period TVUKGBM has expired A logical 1 to the AND gate 3 via blocks 6 and 7 submitted.
  • block 6 there is a query whether the Counter 5 has counted down to 0, i.e. the time TVUKGBM has expired.
  • a trigger pulse (corresponds to logical 1) for the AND gate 3 generates.
  • the time period TVUKGBM depends on the engine temperature, and a characteristic curve 8 gives that to the corresponding one period of time belonging to the current engine temperature TVUKGBM to the Counter 5 off.
  • the third condition for the AND gate 3 a outputs logic 1 to the input ebag of the OR gate 2, is that the output signal Fr1 of the lambda control 1 is lower than an upper threshold FRMBAO (e.g. 1.016).
  • a threshold value decider 9 carries out the comparison of the Output signal Fr1 of lambda control 1 with the upper one Threshold FRMBAO through. Should a stereo lambda control for If there are two motor banks, the average will be off the two output signals Fr1 and Fr2 of lambda control 1 compared with said upper threshold FRMBAO.
  • the mean of the two signals Fr1 and Fr2 is calculated using an additive link 10 and a division circuit 11 determines which of the sum signal from Fr1 and Fr2 through divides the factor 2. With this on the Threshold decision based third condition prevents it from becoming too emaciated Mix comes.
  • Signals that meet the three conditions below for reactivation of lambda control 1 are at the inputs of an OR gate 13, the Output connected to the reset input R of the flip-flop 4 is.
  • the first condition for reactivating the Lambda control 1 is that the lambda control 1 previously has been deactivated. Accordingly, it is Output signal of the AND gate 3 to an input of the OR gate 13 returned. So after a deactivation the lambda control has taken place with a Time delay TLRBAM reversed the deactivation.
  • a second condition for reactivation or for A deactivation of the lambda control 1 is blocked in a signal B_vag, which has the state logic 1 if the mixture is lean.
  • a third condition for reactivation or for blocking the Deactivation of lambda control 1 is that the Load gradient dtl of the internal combustion engine below one Threshold DTLUKVM, which consists of a characteristic curve 14 is removable. So if one of the above three Conditions are given, either the previously set Flip-flop 4 reset or there is a set at all prevents the flip-flop 4, so that a deactivation of the Lambda control 1 is blocked.
  • the first condition is the existence of one Signals B_vag, the at a high mixture lean Assumes logic 1 state.
  • This signal B_vag is on Set input S of a flip-flop 16, which is then a logical 1st puts on an input of the AND gate 15.
  • the second condition for disabling the Lambda control 1 is that the signal B_vag for a predefined period of time is set to the logical 1 state. Whether the signal B_vag for the entire period TVUKGVM in the State logic 1 is set using a counter 17 determines who changes his counter as long as the signal B_vag is present with its logic 1 state and the time period TVUKGVM has not yet been exceeded. If the counter 17 until the end of the TVUKGVM period has counted up, is via the switching blocks 18 and 19 logic 1 to an input of the AND gate 15. in the Block 18 is queried as to whether counter 17 is up to 0 counted down, i.e. the time TVUKGVM has expired. If the counter reading is 0, block 19 turns on Trigger pulse (corresponds to logic 1) for the AND gate 15. The time TVUKGVM is from one of the Motor temperature dependent characteristic curve 20 taken.
  • the third condition for disabling the Lambda control 1 is that the output signal Fr1 or the mean of two output signals Fr1 and Fr2 Lambda control below a lower threshold FRMVAO (e.g. 0.95).
  • FRMVAO e.g. 0.95
  • the comparison of the signal Fr1 and the Average of the signals Fr1 and Fr2 with the lower one Threshold FRMVAO takes place in a block 21 Threshold decision instead. With this on the Threshold decision based third condition prevents it from becoming too rich Mix comes.
  • the first condition is the output signal of the AND gate 15 to a first input of an OR gate 23 returned, the output of which with the reset input R of Flip-flops 16 is connected.
  • the output of the OR gate 23 also takes the state logic 1 and thus sets the flip-flop 16 back, which in turn the output signal of the AND gate 15th assumes the state logic 0.
  • the second condition is a second input of the OR gate 23, the signal B_bag is supplied, which, if the Has logic 1 state, a high mixture enrichment signals. If that's the case, put it Output signal of the OR gate 23, the flip-flop 16 back or blocks a setting of the flip-flop 16, so that the Output signal of the AND gate 15 is not at logic 1 can be set and accordingly none Lambda control 1 is deactivated.
  • the third condition which is a reset of the flip-flop 16 causes and thus a reactivation of the lambda control causes or an activation of the lambda control 1 blocked, is that the load gradient dtl above there is a threshold DTLUKBM. So if that's the Load gradient indicating signal dtl depending on the engine temperature in a map 24 stored threshold DTLUKBM exceeds, is at the third input of the OR gate 23 a logic 1 with the consequence that the flip-flop 16 is reset and thereby the output signal of the AND gate 15 assumes the logic 0 state.

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  • 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)
EP20000106174 1999-04-17 2000-03-21 Procédé de commande d'un mélange air-carburant lors de variations dynamiques extrêmes Expired - Lifetime EP1046802B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999117440 DE19917440B4 (de) 1999-04-17 1999-04-17 Verfahren zur Steuerung des Luft-Kraftstoff-Gemisches bei extremen Dynamikvorgängen
DE19917440 1999-04-17

Publications (3)

Publication Number Publication Date
EP1046802A2 true EP1046802A2 (fr) 2000-10-25
EP1046802A3 EP1046802A3 (fr) 2002-07-31
EP1046802B1 EP1046802B1 (fr) 2005-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000106174 Expired - Lifetime EP1046802B1 (fr) 1999-04-17 2000-03-21 Procédé de commande d'un mélange air-carburant lors de variations dynamiques extrêmes

Country Status (3)

Country Link
EP (1) EP1046802B1 (fr)
JP (1) JP2000310142A (fr)
DE (2) DE19917440B4 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370091B1 (fr) 1988-05-14 1991-09-18 Robert Bosch Gmbh Procede et dispositif de regulation, notamment de regulation lambda

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950862B2 (ja) * 1975-08-05 1984-12-11 日産自動車株式会社 空燃比制御装置
JPS5297027A (en) * 1976-02-09 1977-08-15 Nissan Motor Co Ltd Air fuel ratio controller
JPS6053642A (ja) * 1983-09-02 1985-03-27 Japan Electronic Control Syst Co Ltd 電子制御燃料噴射式内燃機関の空燃比制御装置
JPS61244848A (ja) * 1985-04-22 1986-10-31 Nissan Motor Co Ltd 空燃比制御装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370091B1 (fr) 1988-05-14 1991-09-18 Robert Bosch Gmbh Procede et dispositif de regulation, notamment de regulation lambda

Also Published As

Publication number Publication date
DE19917440A1 (de) 2000-10-19
EP1046802A3 (fr) 2002-07-31
EP1046802B1 (fr) 2005-12-28
DE50011939D1 (de) 2006-02-02
JP2000310142A (ja) 2000-11-07
DE19917440B4 (de) 2005-03-24

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