EP4409126A1 - Verfahren zum betreiben einer antriebseinrichtung sowie entsprechende antriebseinrichtung - Google Patents
Verfahren zum betreiben einer antriebseinrichtung sowie entsprechende antriebseinrichtungInfo
- Publication number
- EP4409126A1 EP4409126A1 EP22786819.7A EP22786819A EP4409126A1 EP 4409126 A1 EP4409126 A1 EP 4409126A1 EP 22786819 A EP22786819 A EP 22786819A EP 4409126 A1 EP4409126 A1 EP 4409126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- oxygen
- fill level
- measured value
- exhaust gas
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
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- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1624—Catalyst oxygen storage capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0814—Oxygen storage amount
-
- 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
Definitions
- the invention relates to a method for operating a drive device, which has a drive unit that generates exhaust gas and an exhaust gas aftertreatment device for aftertreatment of the exhaust gas, the composition of a fuel-air mixture used to operate the drive unit being determined at least temporarily by means of lambda control based on a first measured value of a Exhaust gas aftertreatment direction arranged first lambda probe and is determined based on a second measured value of a downstream of the exhaust gas aftertreatment direction arranged second lambda probe.
- the invention further relates to a drive device.
- the publication DE 10 2018 203 399 A1 is known from the prior art.
- This describes a method for analyzing the oxygen storage capacity of a catalytic converter arranged in an exhaust system of an internal combustion engine.
- the method includes decoupling the internal combustion engine from a drive train, driving the internal combustion engine by means of an electric motor, supplying a lean fuel-air mixture to the catalytic converter until the catalytic converter is fully loaded with oxygen, supplying a rich fuel-air mixture to the catalytic converter , a determination of time profiles of combustion air ratios upstream and downstream of the catalytic converter and a determination of the amount of oxygen that can be stored in the catalytic converter from the determined time profiles of the combustion air ratios.
- the publication DE 10 2005 044 729 A1 discloses a method for lambda control in an internal combustion engine with at least one catalytic converter arranged in an exhaust system of the internal combustion engine, the exhaust system having a front lambda control circuit and a rear lambda control circuit with at least one rear oxygen sensor arranged downstream of the catalytic converter, wherein an output signal from the rear oxygen sensor is processed by the rear lambda control circuit, a differential value is formed from a rear setpoint lambda value and a manipulated variable that acts on the setpoint lambda value of the front lambda control circuit is output.
- a balanced oxygen quantity is determined from the oxygen quantity introduced into and discharged from the catalytic converter and the manipulated variable of the rear lambda control circuit is additionally selected as a function of the balanced oxygen quantity.
- the object of the invention is to propose a method for operating a drive device which has advantages over known methods, in particular an adjustment of an oxygen filling level of an oxygen storage device of the exhaust gas aftertreatment device to a target filling level and/or the determination of an oxygen storage capacity of the oxygen storage device with high accuracy.
- this is achieved with a method for operating a drive device having the features of claim 1 . It is provided that, in order to set an oxygen filling level of an oxygen storage device of the exhaust gas aftertreatment device to a target filling level after the occurrence of a value of the second measured value that corresponds to a boundary value of a filling level range containing the target filling level, the composition is set in such a way that the oxygen filling level increases by a pilot oxygen quantity in the direction of the setpoint fill level changed, then during a control period the composition is determined by means of the lambda control until the second measured value is equal to the setpoint fill level at least within an unavoidable tolerance corresponding desired value and finally the pre-control oxygen quantity is corrected by an oxygen balance value determined during the control period.
- the method is used to operate the drive device, which is provided and designed, for example, to drive a motor vehicle and to that extent to provide a drive torque aimed at driving the motor vehicle.
- the drive device has the drive unit.
- the drive unit is supplied with fuel and oxygen or air containing oxygen, which react with one another in the drive unit. This produces exhaust gas, which is discharged from the drive assembly, in particular in the direction of an area surrounding the drive device.
- the exhaust gas aftertreatment device preferably has at least one of the following devices: three-way catalytic converter, oxidation catalytic converter, NOx storage catalytic converter and SCR catalytic converter.
- the exhaust gas aftertreatment device can have exactly one or more of the devices mentioned or be present as one or more of the devices mentioned.
- the first lambda probe is upstream of the exhaust gas aftertreatment device and the second lambda probe is downstream of the exhaust gas aftertreatment device.
- the residual oxygen content of the exhaust gas upstream of the exhaust gas aftertreatment device is measured Measured exhaust gas, using the second lambda probe in the exhaust gas downstream of the exhaust gas treatment direction present residual oxygen content.
- the first lambda probe delivers the first measured value and the second lambda probe delivers the second measured value.
- Lambda control which adjusts the composition of the fuel/air mixture that is supplied to the drive unit, is carried out based on the two measured values, ie based on both the first measured value and the second measured value.
- the lambda control is carried out using the first measured value, while a trim control is carried out based on the second measured value, which influences the lambda control and at least partially compensates for a possible error in the first lambda probe. This achieves a very high degree of accuracy in the lambda control.
- a broadband lambda probe is preferably used as the first lambda probe and a jump lambda probe is used as the second lambda probe.
- the broadband lambda probe enables the residual oxygen content or the corresponding lambda value to be recorded over a wider measuring range than the step lambda probe.
- the jump lambda probe has a narrower measuring range than the broadband lambda probe; in particular, it is used to identify a lambda value of one. However, the measurement accuracy of the jump lambda probe is higher than that of the broadband lambda probe. Deviations and errors in the first lambda probe are at least partially compensated with the aid of the trim control or using the second measured value of the second lambda probe.
- the exhaust gas aftertreatment device has an oxygen reservoir, which in turn has a material that can absorb and temporarily store the oxygen contained in the exhaust gas and subsequently release it again.
- oxygen from the exhaust gas is introduced into the oxygen storage tank, whereas if there is a lack of oxygen in the exhaust gas, oxygen from the oxygen storage tank is fed into the Exhaust gas is discharged. This ensures proper functioning of the exhaust gas aftertreatment device and, above all, effective conversion of pollutants contained in the exhaust gas into less hazardous products.
- the efficiency of the exhaust gas aftertreatment device ie the extent to which the pollutants can be converted into less dangerous products, depends in particular on the operating conditions of the exhaust gas aftertreatment device and the oxygen fill level of the oxygen store.
- the operating conditions are to be understood in particular as an operating temperature of the exhaust gas aftertreatment device.
- the efficiency of the exhaust gas aftertreatment device is at its optimum at an operating temperature of the exhaust gas aftertreatment device and decreases in the direction of lower temperatures.
- the oxygen filling level of the oxygen storage tank should also be between 30% and 50% (these values are included in each case). In any case, the oxygen storage tank must not be completely empty and must not be completely charged with oxygen. In order to set the oxygen filling level to a target filling level, which is at least 30% and at most 50%, it is necessary to know the oxygen storage capacity of the oxygen storage or at least to determine the amount of oxygen that has to be entered into this starting from a completely empty oxygen storage or must be discharged from it starting from a completely filled oxygen reservoir in order to adjust the oxygen filling level to the target filling level.
- a target filling level which is at least 30% and at most 50%
- the drive assembly is initially operated to achieve a lean exhaust gas until the second measured value of the second lambda probe indicates an excess of oxygen.
- the drive device is then operated to generate rich exhaust gas until the second measured value indicates a lack of oxygen.
- the oxygen balance value is determined, which describes the amount of oxygen discharged from the oxygen accumulator in the period mentioned.
- the oxygen balance value results, for example, from the composition of the fuel/air mixture and its throughput in the drive unit or from the first measured value and the second measured value and an exhaust gas throughput through the exhaust gas aftertreatment device.
- the oxygen storage capacity of the oxygen store is then determined from the oxygen balance value.
- the reverse procedure can also be implemented, in which the drive assembly is first operated to generate rich exhaust gas until the second measured value indicates a lack of oxygen.
- the power plant is then operated to operate lean exhaust gas, again until the second reading indicates excess oxygen.
- the oxygen balance value is determined from the switchover from the rich exhaust gas to the lean exhaust gas until the oxygen excess is detected.
- the oxygen storage capacity is then again determined from the oxygen balance value.
- the procedure described is based on the fact that the oxygen storage device is once completely emptied and once fully charged in order to determine the oxygen storage capacity.
- this can be disadvantageous with regard to the fuel consumption of the drive assembly and/or the resulting pollutant emissions. For this reason, a complete run through of the oxygen storage capacity should be avoided. Instead, it is provided to set the oxygen level directly to the setpoint level, starting from a completely empty oxygen store or a fully charged oxygen store, namely without the oxygen level exceeding or at least without excessively exceeding the setpoint level.
- the filling level range is to be understood as meaning a range which contains the target filling level.
- the filling level range preferably extends from a first value, which corresponds to a completely emptied or discharged oxygen store, to a second value, which corresponds to an oxygen store that is completely filled or loaded with oxygen.
- the boundary value of the filling level range corresponds in particular to either the completely emptied or the completely charged oxygen store, ie an oxygen filling level of 0% or 100%.
- the value corresponding to the edge value is that value of the second measured value which it assumes under the stated conditions, that is to say when the oxygen store is either completely empty or completely charged. If the currently measured second measured value corresponds to this value, then the oxygen store is either completely empty or completely charged.
- the oxygen fill level should be brought to the target fill level by appropriately operating the drive unit without the target fill level being (significantly) overshot by the oxygen fill level, i.e. without overshooting or at least without pronounced overshooting.
- the value of the second measured value that corresponds to the boundary value occurs, for example, during overrun operation of the drive device.
- Overrun mode means that the drive unit is dragged by an externally provided torque without fuel being introduced into the drive unit. This means that only air runs through the drive unit, so that the oxygen storage tank is quickly fully charged with oxygen.
- the second measured value can be the same as the value corresponding to the marginal value, as occurs, for example, when the drive unit is operated at high power, for example when the drive unit is operated with a nominal power or a maximum power.
- the composition is first set in such a way that the oxygen fill level changes by the pilot oxygen quantity.
- the pre-control oxygen quantity is to be understood as a stored value which is used to set the oxygen fill level at least approximately to the desired value.
- the pilot control oxygen quantity is supplied to the oxygen accumulator or discharged from it by operating the drive unit with a specific composition of the fuel-air mixture over a specific period of time.
- the oxygen fill level can be changed by the pilot oxygen quantity in different directions.
- the composition of the fuel-air mixture is determined using the first measured value and the second measured value, more precisely using the lambda control. This is done in such a way that the second measured value changes in the direction of a desired value that corresponds to the desired filling level.
- the regulation is carried out until the second measured value corresponds to the target value, either exactly or at least within the unavoidable tolerance.
- the oxygen balance value is determined, ie it is recorded how much oxygen is introduced into and/or removed from the oxygen store. It is preferably important that the oxygen filling level is changed exclusively in the direction of the desired value during the control period. In particular, this avoids changing the oxygen fill level beyond the setpoint.
- the pre-control oxygen quantity is corrected by the oxygen balance value. If the oxygen balance value is not zero, the input or output of the pilot oxygen quantity was not sufficient to set the oxygen level to the target level and the second measured value does not correspond to the target value.
- the pre-control oxygen quantity is corrected with the oxygen balance value by summation. A new value for the pre-control oxygen quantity is thus obtained by adding the previous value of the pre-control oxygen quantity to the oxygen balance value. The new value is subsequently used as the pre-control oxygen quantity.
- the pre-control oxygen quantity is adjusted to the actually required oxygen quantity, in particular iteratively.
- the corrected pilot control oxygen quantity is used, so that the adjustment is made with greater accuracy and the proportion of the lambda control in the adjustment is smaller than before.
- the composition is set in such a way that the oxygen filling level is reduced by a pilot control oxygen quantity into the filling level range, and then the composition is determined by means of lambda control during a control period until the second measured value is equal, at least within an unavoidable tolerance, to the setpoint value corresponding to the setpoint fill level, and finally the pilot control oxygen quantity is corrected by the oxygen balance value determined during the control period.
- the composition is adjusted in such a way that the oxygen filling level increases by a pilot oxygen quantity in the direction of the setpoint range, and then during a control period the composition is adjusted by means of lambda control is determined until the second measured value corresponds at least within an unavoidable tolerance to the setpoint lying in the setpoint range and finally the pilot oxygen quantity is corrected by the oxygen balance value determined during the control period.
- the procedure described enables the oxygen filling level of the oxygen reservoir to be set to the setpoint filling level without the oxygen filling level passing through the filling level range completely.
- the oxygen filling level is adjusted to the target filling level in a particularly short time.
- the setting of the oxygen fill level to the setpoint fill level is achieved by means of the trim control, which regulates the second measured value to the setpoint.
- This procedure is based on the knowledge that the second measured value can provide at least one indication of the currently present oxygen filling level of the oxygen reservoir.
- the oxygen storage capacity of the exhaust gas aftertreatment device is also determined--optionally--from the corrected pre-control oxygen quantity, in particular as a function of the target filling level.
- a development of the invention provides that the first measured value is regulated to a first setpoint value as part of the lambda control, the first measured value and/or the first setpoint value being corrected with a trim value that is determined by means of a trim control based on the second measured value.
- the composition of the fuel-air mixture is adjusted with the help of the lambda control.
- the first measured value is measured using the first lambda probe and regulated to the first setpoint.
- the first measured value can also be referred to as the controlled variable or as the actual value of the controlled variable and the first desired value as the reference variable of the lambda control.
- the composition of the fuel-air mixture is used as the manipulated variable for lambda control.
- the trim control is also carried out.
- As part of the trim control is used second measured value as controlled variable or as actual value of the controlled variable.
- the trim control uses the trim value, which results accordingly from the trim control, as the manipulated variable.
- the trim value is used to correct the first measured value and/or the first target value.
- the trimming value is included in the lambda control in such a way that a possible error in the first lambda probe is at least partially or even completely compensated for. For example, an offset error of the first lambda probe is compensated for with the aid of the trim control. This significantly improves the accuracy when determining the composition of the fuel-air mixture.
- a further development of the invention provides that, as part of the trim control, the second measured value is controlled by setting the trim value to a second set value corresponding to the set value.
- the second measured value is the controlled variable or its actual value
- the second setpoint is the command variable
- the trim value is the manipulated variable.
- the second setpoint is selected in such a way that any error in the first lambda probe is compensated for.
- the second target value corresponds to a combustion air ratio X of one or slightly less than one.
- the trim control enables an improvement in the quality of the lambda control and, accordingly, a more precise setting of the composition of the fuel-air mixture.
- the second setpoint which is used in the trim control, corresponds to the setpoint already mentioned.
- a development of the invention provides that the filling level range is limited on the one hand by a first value corresponding to an oxygen reservoir completely emptied of oxygen and on the other hand by a second value corresponding to an oxygen reservoir completely filled with oxygen.
- the fill level range extends from an oxygen fill level of 0% to an oxygen fill level of 100%; it therefore includes the entire oxygen storage capacity of the oxygen store.
- the first value limits the fill level range in the direction of smaller values and the second value towards larger values.
- the margin value mentioned above corresponds to either the first value or the second value.
- the oxygen store is either charged with oxygen or oxygen is discharged from it in order to adjust the oxygen fill level to the setpoint fill level.
- the procedure selected depending on which of the values the boundary value corresponds to This means that the procedure described can be used, or is used, both when the oxygen accumulator is completely empty and when it is completely filled. This achieves a particularly high degree of flexibility in the method described.
- a development of the invention provides that a fill level value is used as the target fill level, which lies between the first value and the second value and is spaced apart from both values.
- the target filling level or the value of the target filling level is therefore greater than the first value and smaller than the second value.
- the target filling level is greater than 0% and less than 100%.
- the target filling level is preferably at least 10%, at least 20% and at least 30% and/or at most 70%, at most 60% and at most 50%. In other words, the target filling level is between 10% and 70%, between 20% and 60% or between 30% and 50% (including the stated values in each case). This achieves the high conversion performance described.
- a further development of the invention provides that a filling level value which is closer to the first value than to the second value is used as the setpoint filling level. It has already been explained above that the optimal conversion performance of the exhaust gas aftertreatment device is present at an oxygen fill level between 30% and 50% (these values included in each case). Correspondingly, it is advantageous to select the target fill level in such a way that it describes the completely empty oxygen storage tank rather than the completely charged oxygen storage tank. This in turn serves to achieve a particularly high conversion performance of the exhaust aftertreatment device.
- a development of the invention provides that it is assumed that the second measured value is equal to the setpoint value when a gradient of the trimming value is equal to zero. It is therefore not absolutely necessary to compare the second measured value with the target value. Alternatively, the gradient of the trimming value can rather be evaluated. If the trim value is equal to zero or at least equal to zero within an unavoidable tolerance while the operating point of the drive unit otherwise remains the same, it can be assumed that no further intervention by the trim control takes place in order to change the oxygen filling level in the direction of the setpoint filling level. Consequently, the control period can be ended and the pilot oxygen quantity can be corrected by the oxygen balance value.
- a further development of the invention provides that the second measured value is kept continuously during the control period in a desired value range corresponding to the fill level range at a distance from a further boundary value opposite the boundary value.
- the setpoint range therefore corresponds to a value range that corresponds to the level range.
- the setpoint range is limited on the one hand by a value that the second measured value has when the oxygen storage tank is completely empty, and on the other hand by a value that the second measured value has when the oxygen storage tank is completely filled.
- the setting of the oxygen fill level to the setpoint fill level is now carried out in such a way that the second measured value is spaced continuously from the further edge value, which Boundary value is opposite or limits the target value range on the opposite side. This avoids the complete passage through the filling level range.
- a further development of the invention provides that the second measured value is continuously and consistently adjusted in the direction of the setpoint during the control period.
- the lambda control is carried out in such a way that the second measured value changes continuously in the same direction, namely in the direction of the desired value. In this case, it should in particular be prevented that the second measured value changes again in the direction of the value corresponding to the boundary value.
- Such a procedure enables the oxygen filling level to be adjusted particularly quickly to the target filling level.
- the invention also relates to a drive device, in particular for carrying out the method according to the statements made within the scope of this description, with a drive unit that generates exhaust gas and an exhaust gas aftertreatment device for aftertreatment of the exhaust gas, the drive device being provided and designed for this purpose, a combination of one used to operate the drive unit To determine the fuel-air mixture at least at times by means of a lambda control based on a first measured value of a first lambda probe arranged upstream of the exhaust gas aftertreatment direction and based on a second measured value of a second lambda probe arranged downstream of the exhaust gas aftertreatment direction.
- the drive device is also provided and configured to set an oxygen fill level of an oxygen store of the exhaust gas aftertreatment device to a target fill level after a value of the second measured value has occurred, which corresponds to a boundary value of a fill level range containing the target fill level, to set the composition such that the oxygen fill level changes by a pilot oxygen quantity changed in the direction of the target filling level, then during a control period the composition by means of To determine lambda control until the second measured value is equal to a target value corresponding to the target filling level, at least within an unavoidable tolerance, and finally to correct the pilot control oxygen quantity by an oxygen balance value determined during the control period.
- Figure 1 shows a schematic representation of a drive device with a drive unit and an exhaust gas aftertreatment device
- FIG. 2 several diagrams in which different state variables of the drive device are plotted over time.
- FIG. 1 shows a schematic representation of a drive device 1, which is used, for example, to drive a motor vehicle.
- the drive device 1 is used to provide a drive torque namely by means of a drive assembly 2.
- the drive assembly 2 is supplied with a fuel-air mixture having a specific composition.
- the composition is determined using a device 3 for carrying out lambda control.
- exhaust gas is produced, which is discharged from the drive unit 2 and fed to an exhaust gas aftertreatment device 4 .
- the two lambda probes 5 and 6 are used to record a residual oxygen concentration in the exhaust gas.
- a measured value supplied by the first lambda probe 5 is referred to as the first measured value and a measured value supplied by the second lambda probe 6 is referred to as the second measured value.
- the first measured value serves as an input variable for a first partial device 7 of device 3.
- the actual lambda control of the composition of the fuel-air mixture is carried out in this device.
- the composition is determined in the first sub-device 7 on the basis of the first measured value and a default value supplied according to the arrow 8 .
- a trimming value is transmitted to the first sub-device 7 according to the arrow 9, which is also used when determining the composition.
- the first measured value and/or a first setpoint value determined from the default value is corrected with the trimming value.
- the trim value is determined using a second sub-device 10 of device 3, which is used to carry out a trim control.
- the trim control is carried out using the second measured value of the second lambda probe 6 in that the second measured value is controlled to a second desired value, which is also determined from the default value, for example.
- FIG. 2 shows a number of diagrams in which different curves are plotted over time t.
- the first diagram above shows the first Measured value of the first lambda probe 5 in curves 11, 12 and 13. These curves 11, 12 and 13 are identical for and between times ti, t2 and t3 and only differ from time t3 onwards.
- the middle second diagram shows curves 14, 15 and 16 for an oxygen fill level of an oxygen store of the exhaust gas aftertreatment device 4.
- the curves 14, 15 and 16 are identical for and between the periods ti and t2, but differ from the time t2.
- the lower third diagram shows curves 17, 18 and 19 for the second measured value of the second lambda probe 6.
- the curves 17, 18 and 19 are identical for and between times ti and t2, but differ from time t2 onwards.
- the upper diagram shows that the first measured value before time ti corresponds to a stoichiometric composition of the fuel-air mixture that is supplied to drive unit 2 . From point in time ti, overrun operation of drive device 1 or drive assembly 2 is carried out, drive assembly 2 is thus dragged by an externally provided torque and the fuel supply to drive assembly 2 is interrupted. This means that exhaust gas with a high proportion of air or excess oxygen passes through the drive unit 2 into the exhaust gas aftertreatment device 4 .
- the second measured value drops between time ti and time t2, starting from an initial value of approximately 0.65 V, for example.
- the value to which the second measured value falls corresponds, for example, to an edge value of a filling level range containing a setpoint filling level of the oxygen accumulator.
- the oxygen fill level should be set to a target fill level, which is 50% in the exemplary embodiment shown here.
- a target fill level 50% in the exemplary embodiment shown here.
- the oxygen filling level by correspondingly operating the drive assembly 2 by a pilot oxygen quantity in the direction of the target filling level. This measure is completed at time t3.
- the pilot oxygen quantity is sufficient to adapt the oxygen fill level to the setpoint fill level. This can be seen in curves 14 and 17.
- the composition of the fuel-air mixture is determined using the lambda control.
- the trimming control is also carried out, in the context of which the second measured value is controlled to a target value which corresponds to the target filling level.
- Curves 12 and 13 show the influence of the trim control on the first measured value. The pre-control oxygen quantity was too small for curve 12, so that more oxygen subsequently has to be entered into the oxygen storage tank. Curve 12 corresponds to curves 15 and 18.
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021125380.2A DE102021125380B3 (de) | 2021-09-30 | 2021-09-30 | Verfahren zum Betreiben einer Antriebseinrichtung sowie entsprechende Antriebseinrichtung |
| PCT/EP2022/077025 WO2023052453A1 (de) | 2021-09-30 | 2022-09-28 | Verfahren zum betreiben einer antriebseinrichtung sowie entsprechende antriebseinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4409126A1 true EP4409126A1 (de) | 2024-08-07 |
| EP4409126B1 EP4409126B1 (de) | 2025-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| EP22786819.7A Active EP4409126B1 (de) | 2021-09-30 | 2022-09-28 | Verfahren zum betreiben einer antriebseinrichtung sowie entsprechende antriebseinrichtung |
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| Country | Link |
|---|---|
| US (1) | US12577896B2 (de) |
| EP (1) | EP4409126B1 (de) |
| CN (1) | CN118043543A (de) |
| DE (1) | DE102021125380B3 (de) |
| WO (1) | WO2023052453A1 (de) |
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| DE102024108307A1 (de) * | 2024-03-22 | 2025-09-25 | Audi Aktiengesellschaft | Verfahren zum Betreiben einer Antriebseinrichtung für ein Kraftfahrzeug, Antriebseinrichtung für ein Kraftfahrzeug sowie Computerprogrammprodukt |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004060125B4 (de) * | 2004-12-13 | 2007-11-08 | Audi Ag | Verfahren zur Steuerung der Be- und Entladung des Sauerstoffspeichers eines Abgaskatalysators |
| DE102005044729A1 (de) | 2005-09-19 | 2007-03-22 | Volkswagen Ag | Lambdaregelung mit Sauerstoffmengenbilanzierung |
| DE102007005680B3 (de) * | 2007-02-05 | 2008-04-17 | Siemens Ag | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
| DE102012019907B4 (de) * | 2012-10-11 | 2017-06-01 | Audi Ag | Verfahren zum Betreiben einer Brennkraftmaschine mit einer Abgasreinigungseinrichtung sowie entsprechende Brennkraftmaschine |
| US9765672B2 (en) * | 2013-01-29 | 2017-09-19 | Toyota Jidosha Kabushiki Kaisha | Control system of internal combustion engine |
| DE102016222418A1 (de) | 2016-11-15 | 2018-05-17 | Robert Bosch Gmbh | Verfahren zur Regelung einer Füllung eines Speichers eines Katalysators für eine Abgaskomponente |
| JP6404970B2 (ja) | 2017-03-10 | 2018-10-17 | ファナック株式会社 | ロータリエンコーダ |
| DE102018200399B4 (de) | 2018-01-11 | 2022-12-29 | Ford Global Technologies, Llc | Verfahren zur Analyse der Sauerstoffspeicherkapazität eines Katalysators und Antrieb für ein Kraftfahrzeug |
| DE102018219978B3 (de) * | 2018-11-22 | 2019-11-21 | Audi Ag | Verfahren zum Betreiben einer Antriebseinrichtung sowie entsprechende Antriebseinrichtung |
| DE102018251720A1 (de) * | 2018-12-27 | 2020-07-02 | Robert Bosch Gmbh | Verfahren zur Ermittlung einer maximalen Speicherfähigkeit eines Abgaskomponentenspeichers eines Katalysators |
| WO2021229873A1 (ja) * | 2020-05-14 | 2021-11-18 | 日立Astemo株式会社 | 内燃機関制御装置 |
| DE102020212710A1 (de) * | 2020-10-08 | 2022-04-14 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren, Recheneinheit und Computerprogramm zum Betreiben einer Brennkraftmaschine |
| CN115956001A (zh) * | 2020-10-29 | 2023-04-11 | 日立安斯泰莫株式会社 | 内燃机的控制装置以及催化剂劣化诊断方法 |
-
2021
- 2021-09-30 DE DE102021125380.2A patent/DE102021125380B3/de active Active
-
2022
- 2022-09-28 CN CN202280066285.1A patent/CN118043543A/zh active Pending
- 2022-09-28 EP EP22786819.7A patent/EP4409126B1/de active Active
- 2022-09-28 WO PCT/EP2022/077025 patent/WO2023052453A1/de not_active Ceased
- 2022-09-28 US US18/697,577 patent/US12577896B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN118043543A (zh) | 2024-05-14 |
| WO2023052453A1 (de) | 2023-04-06 |
| US20240410304A1 (en) | 2024-12-12 |
| DE102021125380B3 (de) | 2022-10-06 |
| EP4409126B1 (de) | 2025-06-11 |
| US12577896B2 (en) | 2026-03-17 |
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