EP1192346A1 - Verfahren zum überwachen einer mit luftüberschuss betreibbaren brennkraftmaschine - Google Patents
Verfahren zum überwachen einer mit luftüberschuss betreibbaren brennkraftmaschineInfo
- Publication number
- EP1192346A1 EP1192346A1 EP00952891A EP00952891A EP1192346A1 EP 1192346 A1 EP1192346 A1 EP 1192346A1 EP 00952891 A EP00952891 A EP 00952891A EP 00952891 A EP00952891 A EP 00952891A EP 1192346 A1 EP1192346 A1 EP 1192346A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tqi
- internal combustion
- combustion engine
- torque
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 230000001629 suppression Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 15
- 239000000523 sample Substances 0.000 description 10
- 230000003197 catalytic effect Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 239000008240 homogeneous mixture Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3076—Controlling fuel injection according to or using specific or several modes of combustion with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing
-
- 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
- F02D41/1497—With detection of the mechanical response of the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/26—Control of the engine output torque by applying a torque limit
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3023—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode
- F02D41/3029—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode further comprising a homogeneous charge spark-ignited mode
Definitions
- the invention relates to a method for monitoring an internal combustion engine that can be operated both with a homogeneous air-fuel mixture and with a high excess of air to form a stratified air-fuel mixture, in particular an internal combustion engine with direct injection.
- the internal combustion engine In the lower load range, the internal combustion engine is operated with a strongly stratified cylinder charge and a large excess of air (stratified charge mode). This is achieved by late injection into the compression stroke just before the ignition point. The internal combustion engine is operated largely unthrottled while avoiding throttle losses. A high exhaust gas recirculation rate is aimed at in order to reduce the raw NOx emission.
- the internal combustion engine In the upper load range, the internal combustion engine is operated with a homogeneous cylinder charge. The injection takes place during the intake stroke in order to obtain a good mixture of fuel and air.
- the intake air mass is adjusted according to the driver's torque request via a throttle valve.
- the required injection quantity is calculated from the air mass and the speed and corrected using the lambda control, among other things.
- the fuel is injected either in a conventional manner into the intake manifold or directly into the cylinder or cylinders of the internal combustion engine (direct injection).
- WO 99/18343 discloses a method and a device for monitoring an internal combustion engine with direct fuel injection and / or largely throttle-free load control.
- a treasure value of the fuel mass is calculated, which is metered into one cylinder per work cycle, since the actual fuel mass is the decisive influencing variable for the value of the actual indicated torque.
- the treasure value for the fuel mass is calculated as a function of an air ratio, which is determined by an oxygen sensor arranged in the exhaust tract of the internal combustion engine.
- a treasure value for the indicated torque of the internal combustion engine is calculated.
- Emergency running of the internal combustion engine is controlled when the treasure value and a target value of the indicated torque meet a predetermined condition.
- a setpoint value of a torque to be set via the air mass flow is determined using a device for specifying the torque.
- a treasure value of an ignition-normalized actual torque is either derived from the measurement signal of a torque sensor or from the air mass flow sucked into the combustion chambers.
- An ignition angle is adjusted as a function of the deviation of the target value from the normalized treasure value of the torque.
- the object of the invention is to specify a method for controlling an internal combustion engine of the type mentioned at the outset, which makes it possible to control the internal combustion engine into a safe operating state even in the event of an excessive torque failure.
- This object is achieved by the features of patent claim 1.
- Advantageous embodiments of the invention are specified in the subclaims.
- TQI excessive torque
- FIG. 1 shows a schematic illustration of an internal combustion engine with direct injection, in which the method according to the invention is used and
- Figure 2 is a flowchart for monitoring and controlling the internal combustion engine
- Reference number 10 denotes a piston which delimits a combustion chamber 12 in a cylinder 11.
- An intake duct 13 opens into the combustion chamber 12, through which the combustion air flows into the combustion chamber 12, controlled by an inlet valve 14.
- an exhaust duct 16 branches off from the combustion chamber 12, in the further course of which an oxygen sensor in the form of a broadband (linear) lambda probe 17 and a NOx storage catalytic converter 18 are arranged.
- the air ratio is regulated in accordance with the setpoint values in the various operating ranges of the internal combustion engine.
- This function is performed by a lambda control device known per se, which is preferably integrated in a control device 21 of the internal combustion engine.
- the signal from an oxygen sensor 32 arranged after the NOx storage catalytic converter 18 is required as a guide probe.
- This probe signal of the lambda probe 32 arranged after the NOx storage catalytic converter 18 is also used to control the storage regeneration and to adapt model variables such as the oxygen or NOx Storage capacity used.
- a NOx sensor can also be used.
- the temperature of the NOx storage catalytic converter 18, which is required for the consumption and emission-optimal control of the exhaust gas aftertreatment system, is calculated using a temperature model from the sensor signal of a temperature sensor 33. Based on this measurement signal, catalyst heating and catalyst protection measures are also initiated. As an alternative to this, the temperature of the NOx storage catalytic converter 18 can also be measured directly by arranging a temperature sensor directly in the housing thereof.
- the NOx storage catalytic converter is used to comply with the required exhaust gas limit values in operating areas with lean combustion. Due to its coating, it adsorbs the NOx compounds generated in the exhaust gas during lean combustion.
- An exhaust gas recirculation device is provided in order to reduce the NOx emissions of the internal combustion engine that occur especially in internal combustion engines with direct injection and stratified charge operation. By adding exhaust gas to the fresh air drawn in, the peak combustion temperature is reduced, which reduces the temperature-dependent nitrogen oxide emission.
- an exhaust gas recirculation line 19 branches off from the exhaust gas duct 16 in the flow direction of the exhaust gas, in front of the NOx storage catalytic converter 18
- Throttle valve 20 mouths in the intake duct 13.
- the amount of the recirculated exhaust gas is adjusted by changing the duty cycle of a signal output by the control device 21 for a controllable valve 22, generally referred to as an exhaust gas recirculation valve.
- the fresh air necessary for combustion in the cylinder 11 flows through an air filter (not shown) and an air mass meter 23 into the intake tract 13 to the throttle valve 20.
- This throttle valve 20 is an electric motor-controlled throttle element (E-gas system), the opening cross section of which in addition to actuation by the driver (driver's request), it can also be set independently of this via signals from control device 21.
- E-gas system electric motor-controlled throttle element
- this can reduce disturbing load change reactions of the vehicle when accelerating and decelerating, as well as torque jumps during the transition from operation with a homogeneous mixture to operation with stratified charge and unrestricted air flow.
- a signal for the position of the throttle valve 20 is output to the control device 21 for monitoring.
- a temperature sensor 24 detects the temperature of the intake air in the intake duct 13 of the internal combustion engine and emits a corresponding signal to the control device 21.
- the temperature sensor 24 can be integrated in the air mass meter 23.
- a spark plug 25 and an injection valve 26 protrude into the combustion chamber 12, through which the fuel is injected against the compression pressure in the combustion chamber 12.
- the demand and provision of the fuel for this injection valve 26 is carried out by a known fuel supply system for gasoline direct injection, of which only a high-pressure accumulator 27 is shown from the associated fuel circuit, to which the individual injection valves are connected.
- a temperature sensor 28 detects a signal corresponding to the temperature of the internal combustion engine, for example by measuring the coolant temperature.
- the speed N of the internal combustion engine is detected with the aid of a markings on the crankshaft or a sensor 29 which scans the sensor wheel connected to it. Both signals are used by the control direction 21 for further processing, inter alia for controlling the internal combustion engine with respect to the control strategy to be chosen — homogeneous mixture or stratified mixture.
- control parameters that are required for operating the internal combustion engine such as, for example, accelerator pedal position, signals from knock sensors, battery voltage, driving dynamics requirements, etc., are also supplied to the control device 21 and are generally identified in the figure by the reference symbol 30.
- the above-mentioned parameters are used in the control device 21 by processing stored control routines, among other things.
- the load state of the internal combustion engine is recognized, the raw NOx emission of the internal combustion engine and the degree of loading of the NOx storage catalytic converter are determined.
- the parameters are also processed and processed in such a way that, in certain operating states of the internal combustion engine, i.a. a switchover from operation with a homogeneous mixture to operation with stratified charging and vice versa can be carried out and / or a recirculation of exhaust gas can be initiated.
- a block 31 for torque determination and torque monitoring is provided in the control device 21, the function of which will be explained in more detail.
- control device 21 is connected to a storage device 34 in which, among other things, Various threshold values TQI_SW1, TQI_SW2, and at least one map KF1 are stored, the respective meaning of which is explained in more detail with reference to the description of the following figure.
- FIG. 2 shows the process for monitoring and controlling the internal combustion engine when an impermissibly high torque occurs in the form of a flowchart which is only shown schematically.
- the internal combustion engine is operated with a stratified air-fuel mixture (air ratio ⁇ »l, left branch in FIG. 2) or with a homogeneous air-fuel mixture (air ratio ⁇ > l, right branch in FIG. 2) different monitoring mechanisms for the torque of the internal combustion engine are activated.
- the torque delivered by the internal combustion engine is almost exclusively dependent on its speed and the fuel mass. For this reason, the torque can be determined in this operating mode via a map KF1, which is spanned over the speed and the fuel mass.
- the fuel mass supplied to the cylinders of the internal combustion engine can be estimated as a function of the signal from the lambda probe 17, as specified, for example, in W099 / 18343.
- the current torque TQI determined according to the specified method is compared with a predetermined value for a maximum permissible torque, namely a first threshold value TQI_SW1.
- the first threshold value TQI_SW1 is determined by tests on a test bench, by driving tests or by simulation and is stored in the memory 34. If the current torque TQI is less than the first threshold value TQI_SW1, the process jumps back either to method step S1 when the internal combustion engine is operating with a stratified air-fuel mixture ( ⁇ »l) (dashed line), or to the method step S3, when the internal combustion engine is in operation with a homogeneous air-fuel mixture ( ⁇ > l).
- the threshold value SW1 applies to the current torque TQI of the internal combustion engine, regardless of whether the operation with a stratified air-fuel mixture ( ⁇ »l) or the operation with a homogeneous air-fuel mixture ( ⁇ > l) is activated.
- the determination of the current torque and the monitoring, i.e. the comparison with the threshold values takes place in block 31 of control device 21.
- the current torque TQI determined in a known manner is then compared in a method step S5 with a maximum torque (second threshold value SW2) desired by the driver of the vehicle driven by the internal combustion engine.
- the second threshold is also TQI SW2 determined by tests on a test stand, by driving tests or by simulation and is stored in the memory 34.
- the query in method step S5 delivers a positive result, ie if the torque TQI exceeds the second threshold value TQI_SW2, it is ensured by initiating emergency running reactions that the internal combustion engine is brought into a safe state (method step S6).
- the torque of the internal combustion engine can be limited, for example, by switching off the electric gas throttle valve, or the speed is limited by suppressing the injection for a specific number of cylinders.
- interventions in the ignition can also take place, which on the one hand limit the torque or the acceleration, but on the other hand allow the vehicle to continue to the next workshop.
- the predetermined condition for an emergency operation can also be designed such that the difference between the current torque and the permissible maximum value is integrated for a predetermined period of time, starting at a point in time at which the current value becomes greater than the maximum value of the torque.
- the condition is met if the integral is larger than another threshold value.
- the condition can also be designed in any other way.
- the method erfindungssgemä- SSE the example of the torque control has been explained, but Moreover, it is also possible not the torque itself, but to attract a proportional torque magnitude manufacturing •. For example, in the case of operation the
- the fuel mass flow supplied to the internal combustion engine can be used in an advantageous manner.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19930576 | 1999-07-02 | ||
| DE19930576 | 1999-07-02 | ||
| PCT/DE2000/002159 WO2001002711A1 (de) | 1999-07-02 | 2000-07-03 | Verfahren zum überwachen einer mit luftüberschuss betreibbaren brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1192346A1 true EP1192346A1 (de) | 2002-04-03 |
| EP1192346B1 EP1192346B1 (de) | 2004-05-12 |
Family
ID=7913443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00952891A Expired - Lifetime EP1192346B1 (de) | 1999-07-02 | 2000-07-03 | Verfahren zum überwachen einer mit luftüberschuss betreibbaren brennkraftmaschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1192346B1 (de) |
| DE (1) | DE50006419D1 (de) |
| WO (1) | WO2001002711A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10050663A1 (de) † | 2000-10-13 | 2002-04-18 | Gruenenthal Gmbh | Verwendung von substituierten Imidazo[1,2-a]pyridin-, -pyrimidin- und pyrazin-3-yl-amin-Derivaten zur Herstellung von Medikamenten zur NOS-Inhibierung |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4232974C2 (de) * | 1992-10-01 | 2002-05-16 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Einstellen des Drehmoments eines Ottomotors |
| JP3201936B2 (ja) * | 1995-09-29 | 2001-08-27 | 株式会社日立製作所 | 筒内噴射エンジンの制御装置 |
| DE19631986A1 (de) * | 1996-08-08 | 1998-02-12 | Bosch Gmbh Robert | Steuereinrichtung für eine direkteinspritzende Benzinbrennkraftmaschine |
| EP0887533B1 (de) * | 1997-06-25 | 2004-08-18 | Nissan Motor Company, Limited | Steuervorrichtung einer direkteinspritzenden Otto-Brennkraftmaschine |
| DE19729100A1 (de) * | 1997-07-08 | 1999-01-14 | Bosch Gmbh Robert | Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs |
| DE59804153D1 (de) * | 1997-10-07 | 2002-06-20 | Siemens Ag | Verfahren und einrichtung zum überwachen einer brennkraftmaschine |
-
2000
- 2000-07-03 EP EP00952891A patent/EP1192346B1/de not_active Expired - Lifetime
- 2000-07-03 WO PCT/DE2000/002159 patent/WO2001002711A1/de not_active Ceased
- 2000-07-03 DE DE50006419T patent/DE50006419D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0102711A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1192346B1 (de) | 2004-05-12 |
| DE50006419D1 (de) | 2004-06-17 |
| WO2001002711A1 (de) | 2001-01-11 |
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