EP2956652A1 - Verfahren zum betreiben einer brennkraftmaschine - Google Patents
Verfahren zum betreiben einer brennkraftmaschineInfo
- Publication number
- EP2956652A1 EP2956652A1 EP13811388.1A EP13811388A EP2956652A1 EP 2956652 A1 EP2956652 A1 EP 2956652A1 EP 13811388 A EP13811388 A EP 13811388A EP 2956652 A1 EP2956652 A1 EP 2956652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- fuel mass
- calculation
- lda
- correction
- 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
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
- F02D41/3005—Details not otherwise provided for
-
- 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
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- 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
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2048—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit said control involving a limitation, e.g. applying current or voltage limits
-
- 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
Definitions
- the invention relates to a method for operating an internal combustion engine, in which a setpoint torque is calculated from an input variable representing the desired output, wherein the setpoint torque is limited by a charge-pressure-dependent limit.
- a desired torque is determined by the control and the internal combustion engine is controlled accordingly in order to set this desired torque.
- the setpoint torque is the manipulated variable of the speed controller.
- a method for torque-oriented control of an internal combustion engine is known. This method is also applicable to an internal combustion engine having a plurality of exhaust gas turbochargers.
- a setpoint torque is calculated from an input variable representing the desired output, and the setpoint torque is limited by an air mass-dependent maximum torque.
- LDA boost pressure dependent
- the fuel mass is corrected as a function of the air mass ratio.
- a two-dimensional weighting curve with the desired torque is used as the input variable. If the weighting curve has a very steep transition, for example from the value 0 to the value 1 when the setpoint torque increases, and the associated correction characteristic field has values greater than 1, the result is a positive one in the transition range of the weighting curve as the desired torque increases Fuel mass correction value, ie, the target fuel mass is raised.
- a larger fuel mass leads to the calculation of a lower efficiency.
- a lower efficiency in turn leads to the calculation of a smaller LDA limiting torque. If the setpoint torque is limited during load switching or during startup by the LDA function, the result is a decreasing setpoint torque. Since the setpoint torque represents the input variable of the weighting curve, this reduces the correction value of the fuel mass and thus also the setpoint fuel mass.
- a method according to claim 1 and an arrangement with the features of claim 7 are presented. Embodiments result from the dependent claims and the description.
- a target torque from an input representing the power desired input, z As an accelerator pedal position or a target speed, calculated, the target torque is limited by a boost pressure-dependent limit, with a correction of the fuel mass is dynamically decoupled from the calculation of the boost pressure-dependent limitation.
- a delay element can be used. This may, for example, be a filter. Dynamic decoupling is also achieved if a flat or horizontal curve is selected for the weighting curve.
- a speed controller I component is used as the input variable of a weighting curve.
- a correction of the fuel mass may also be dynamically decoupled from the calculation of the charge-pressure-dependent limit by dynamically decoupling a calculation of an efficiency from the calculation of the LDA-limiting torque.
- a stabilization of the speed control loop is achieved according to the invention by dynamically decoupling the calculation of the efficiency from the calculation of the LDA limiting torque.
- the efficiency z. B. with Help of a PTi filter are filtered.
- the time constant of this filter can be set by a parameter.
- the presented method has, at least in some of the embodiments, considerable advantages. Due to the dynamic decoupling of the fuel mass correction from the calculation of the charge pressure-dependent limitation of the desired torque, the so-called LDA limitation, a stable use of the LDA limitation is made possible. Thus, instabilities are prevented.
- FIG. 1 shows in a graph an unstable behavior of an internal combustion engine.
- FIG. 2 shows the calculation of the LDA limitation.
- FIG. 3 shows the calculation of the standard fuel mass.
- FIG. 4 shows the calculation of the corrected standard fuel mass.
- FIG. 5 shows a correction of the fuel mass as a function of the air mass ratio.
- FIG. 6 shows a further correction of the fuel mass as a function of the air mass ratio.
- FIG. 7 shows a further calculation of the LDA limitation.
- FIG. 8 shows the calculation of the air mass ratio.
- FIG. 9 shows in a flowchart the calculation of the
- FIG. 10 shows values for the two-dimensional weighting curve.
- FIG. 11 shows values for the three-dimensional characteristic diagram of the air mass-dependent fuel mass correction.
- FIG. 1 illustrates in a graph instabilities during load switching.
- a first curve 20 shows the course of the injection setpoint
- a second curve 22 the course of the setpoint speed
- a third curve 24 the LDA limit
- a fourth curve 26 the course of the actual motor speed
- a fifth curve 28 the curve of the maximum torque or Target torque
- a sixth curve 30 the air mass ratio dependent fuel mass correction value
- a seventh curve 34 the dependent of the injection start correction fuel mass correction value.
- Figure 1 thus shows the unstable behavior of an internal combustion engine during load switching.
- the instability occurs exactly when the nominal moment with the loading pressure-dependent limitation, namely the LDA curve, becomes identical.
- the LDA curve As a result, violent vibrations of the setpoint torque, the maximum setpoint torque and the LDA limit occur. These quantities are identical, since the setpoint torque is limited by the LDA curve and thus the maximum setpoint torque. Since the target torque oscillates, strong oscillations of the nominal injection quantity occur.
- FIG. 1 shows that above all the fuel mass correction value, which is dependent on the air mass ratio, has strong vibrations.
- FIG. 2 shows the calculation of the LDA limitation. From the charge air temperature 50, the cylinder volume 52 and the charge air pressure 54, the current air mass 56 is calculated. From this air mass 56 and the actual engine speed 58, the LDA fuel mass 60 is calculated via an LDA map 62.
- the LDA fuel mass 60 is converted into the LDA moment 66 by multiplication with the efficiency 64.
- the efficiency 64 is calculated here as the quotient of nominal torque 68 and corrected standard fuel mass 70.
- Figures 3 and 4 show how the corrected standard fuel mass is calculated.
- the target torque 100 as the output variable of the speed controller or as a result of the accelerator pedal position is in this case first added to the friction torque 102.
- the friction torque represents the multiplied by the number of cylinders output of a three-dimensional map.
- the input variables of this map are the actual engine speed and a virtual temperature. This virtual temperature is made up of two temperatures, e.g. B. the cooling water and the oil temperature calculated.
- the output variable of the map is that NEN cylinder related friction torque of the engine.
- the sum of desired torque 100 and friction torque 102 results in the corrected setpoint torque 104. From this corrected setpoint torque and the actual engine speed 106, the normalized fuel mass 110 is determined via the efficiency map 108. It can be used with activated cylinder deactivation or modified engine tuning a separate efficiency map.
- the normalized fuel mass 110 is subsequently corrected as a function of the air mass ratio 114. Further corrections, z.
- an injection start correction 116 the ambient air temperature 118, and the fuel temperature 120 eventually results in the corrected standard fuel mass 124 used in calculating the LDA limit to determine efficiency.
- FIG. 5 shows how the normalized fuel mass is corrected as a function of the air mass ratio:
- the value 1 is subtracted from the dimensionless output value 200 of a predefinable characteristic map 202 with the input variables air mass ratio 204 and actual engine speed 206.
- the result is multiplied by the output value 208 of a predeterminable two-dimensional curve 210.
- This weighting curve 210 has the setpoint torque 212 as an input variable.
- the result 214 of the multiplication is then added with the value 1.
- the resulting sum 216 finally represents the multiplied correction factor of the normalized fuel mass multiplied by the standard fuel mass 218.
- FIG. 6 shows the correction of the fuel mass as a function of the air mass ratio according to an embodiment of the presented method.
- FIG. 7 shows the charge air pressure limitation LDA according to an embodiment of the illustrated method.
- FIG. 8 shows the calculation of the air mass ratio
- the current air mass 406 is calculated.
- the standard air mass 408 is calculated from a three-dimensional map 410, which depends on the actual engine speed 412, the target torque 414 and the supercharger switching state 416.
- Air mass ratio 420 is calculated as the quotient of current air mass 406 and standard air mass 408.
- this dimensionless quotient is less than one. If there is an excess of air, this quotient is greater than one.
- FIGS. 10 and 11 show by way of example values for the two-dimensional weighting curve and the three-dimensional characteristic map of the fuel mass correction as a function of the air mass ratio: If the nominal torque is less than 14000 Nm, then the weighting factor is identical to zero, so that the fuel mass is not corrected.
- the weighting factor is identical to one. Whether the fuel mass is corrected depends in this case on the predefinable three-dimensional map shown in FIG. If the air mass ratio is greater than 1.0, all map values are identical 1.0, d. H. the fuel mass is not corrected. In all other cases, the map values are greater than 1.0 so that the fuel mass is corrected, i. H. multiplicatively increased. If the air mass ratio, for example due to a load-on circuit, drops to 0.65 and the actual engine speed simultaneously to 1400 rpm, the fuel mass is corrected upwards by 14%.
- the weighting factor changes from the value 0 to the value 1.
- the air mass ratio-dependent correction of the fuel mass starts to take effect, namely, the greater the desired torque . If the actual speed of the motor drops as a result of a load connection, the speed controller increases the setpoint torque. If this is greater than 14000 Nm, the fuel mass is corrected upward because at the same time the air mass ratio decreases. A higher fuel mass causes according to Figure 2 a lower efficiency and thus a reduction of the LDA moment. If the setpoint torque is limited by the LDA moment, the setpoint torque also decreases with the LDA moment. This in turn means that the air mass-dependent correction of the fuel mass is reduced. This increases the efficiency and the LDA moment is raised. Since the setpoint torque is limited by the LDA moment is, also the target torque is raised. Thus, the air mass-dependent correction of the fuel mass is increased again, whereby the efficiency is reduced again, etc.
- the described instability can be triggered in the same way by the correction of the fuel mass in response to a start of injection correction.
- the presented method is characterized in that the correction of the fuel mass is dynamically decoupled from the calculation of the LDA moment.
- FIG. 6 shows how this can be implemented in the correction of the fuel mass as a function of the air mass ratio. Identical components as in FIG. 5 are given the same reference numbers:
- the speed controller I portion 234 is used as the input quantity 236 of the weighting curve 210.
- the correction value is filtered and in addition to the setpoint torque of the speed controller I share is used as the input of the weighting curve.
- FIG. 7 shows a further embodiment of the invention.
- a PT1 filter 75 is provided.
- a further embodiment of the invention is characterized by the design of the weighting curve of the fuel mass correction. Does this have a constant value, z. B. the value 1, or a flat course, so also a stabilization of the LDA limit is achieved.
- FIG. 9 shows a program sequence lan for the calculation of the desired LDA torque according to FIG. 7.
- the actual engine speed is calculated in step S1.
- the target torque is calculated in step S2.
- the corrected standard fuel mass is determined. From the charge air temperature, the charge air pressure and the cylinder volume, the air mass is calculated in step S4.
- the LDA fuel mass can be determined from the LDA map in step S5.
- the efficiency is calculated from the target torque and the corrected standard fuel mass.
- the efficiency is filtered using a ⁇ filter. The filtered efficiency is multiplied by the LDA fuel mass in step S8.
- step S8 is finally the desired LDA torque.
- step S1 the procedure continues again with step S1.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012025019.3A DE102012025019B4 (de) | 2012-12-20 | 2012-12-20 | Verfahren zum Betreiben einer Brennkraftmaschine |
| PCT/EP2013/003819 WO2014095046A1 (de) | 2012-12-20 | 2013-12-17 | Verfahren zum betreiben einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2956652A1 true EP2956652A1 (de) | 2015-12-23 |
| EP2956652B1 EP2956652B1 (de) | 2017-05-03 |
Family
ID=49876547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13811388.1A Active EP2956652B1 (de) | 2012-12-20 | 2013-12-17 | Verfahren zum betreiben einer brennkraftmaschine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20150354490A1 (de) |
| EP (1) | EP2956652B1 (de) |
| CN (1) | CN104995389A (de) |
| BR (1) | BR112015014000A2 (de) |
| DE (1) | DE102012025019B4 (de) |
| HK (1) | HK1216434A1 (de) |
| WO (1) | WO2014095046A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014001581B4 (de) | 2014-02-06 | 2017-04-06 | Mtu Friedrichshafen Gmbh | Verfahren zur Ausführung mit einer für einen Zylinderabschaltbetrieb eingerichteten Brennkraftmaschine |
| DE102016215856A1 (de) * | 2016-08-24 | 2018-03-01 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine mit Saugrohreinspritzung |
| CN110943671B (zh) * | 2019-12-19 | 2023-05-26 | 瑞声科技(新加坡)有限公司 | 一种电机信号控制方法、终端设备及存储介质 |
| WO2021120100A1 (zh) * | 2019-12-19 | 2021-06-24 | 瑞声声学科技(深圳)有限公司 | 一种电机信号控制方法、终端设备及存储介质 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3612175B2 (ja) * | 1997-07-15 | 2005-01-19 | 株式会社日立製作所 | 筒内噴射エンジンの燃料圧力制御装置 |
| DE10036282A1 (de) * | 2000-07-26 | 2002-02-07 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung einer Antriebseinheit |
| US6652233B2 (en) * | 2002-01-14 | 2003-11-25 | Toyota Jidosha Kabushiki Kaisha | Control system for a turbo-charged diesel aircraft engine |
| DE102004001913B4 (de) | 2004-01-14 | 2005-12-29 | Mtu Friedrichshafen Gmbh | Verfahren zur momentenorientierten Steuerung einer Brennkraftmaschine |
| DE102004011599B4 (de) * | 2004-03-10 | 2006-03-02 | Mtu Friedrichshafen Gmbh | Verfahren zur momentenorientierten Steuerung einer Brennkraftmaschine |
| US7171299B1 (en) * | 2005-08-23 | 2007-01-30 | Gm Global Technology Operations, Inc. | Driveline clunk management system |
| DE102006008356B4 (de) | 2006-02-21 | 2007-11-29 | Mtu Friedrichshafen Gmbh | Verfahren zur Leistungsbegrenzung einer Brennkraftmaschine |
| US20100313854A1 (en) * | 2006-12-27 | 2010-12-16 | Mitsubishi Fuso Truck And Bus Corporation | Fuel injection control device of internal combustion engine |
| US7987672B2 (en) * | 2008-01-22 | 2011-08-02 | GM Global Technology Operations LLC | Turbocharger protection systems and methods |
| DE102008001128A1 (de) * | 2008-04-11 | 2009-10-15 | Robert Bosch Gmbh | Adaption eines stationären Maximalmoments einer Brennkraftmaschine |
| GB2490933A (en) * | 2011-05-19 | 2012-11-21 | Gm Global Tech Operations Inc | Method of operating an internal combustion engine using a torque correction feedback loop |
-
2012
- 2012-12-20 DE DE102012025019.3A patent/DE102012025019B4/de not_active Expired - Fee Related
-
2013
- 2013-12-17 WO PCT/EP2013/003819 patent/WO2014095046A1/de not_active Ceased
- 2013-12-17 EP EP13811388.1A patent/EP2956652B1/de active Active
- 2013-12-17 US US14/653,718 patent/US20150354490A1/en not_active Abandoned
- 2013-12-17 HK HK16104364.2A patent/HK1216434A1/zh unknown
- 2013-12-17 CN CN201380067106.7A patent/CN104995389A/zh active Pending
- 2013-12-17 BR BR112015014000A patent/BR112015014000A2/pt active Search and Examination
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012025019B4 (de) | 2021-10-14 |
| EP2956652B1 (de) | 2017-05-03 |
| HK1216434A1 (zh) | 2016-11-11 |
| US20150354490A1 (en) | 2015-12-10 |
| DE102012025019A1 (de) | 2014-06-26 |
| BR112015014000A2 (pt) | 2017-07-11 |
| WO2014095046A1 (de) | 2014-06-26 |
| CN104995389A (zh) | 2015-10-21 |
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