DE102006034521A1 - Engine oil dilution method for internal combustion engine particularly motor vehicle, involves determining current dilution degree of engine oil with fuel and dilution event is set up or obtained on basis of dilution degrees - Google Patents

Abstract

The method involves determining the current dilution degree of engine oil with fuel. The future dilution degree of the engine oil is determined with fuel. The determination data is prediction-based and a dilution event is set up or obtained on the basis of dilution degrees. The threshold value calculated is based on the dilution degrees, and determined is based on its holding over the execution of the dilution occurrence. A regeneration of diesel particle filter or a nitrogen oxide or sulphur oxide storage medium, deals with the dilution occurrence.

Description

The The invention relates to a method for controlling a motor oil dilution of a Internal combustion engine, in particular of a motor vehicle, in which a current degree of dilution of the engine oil is determined with fuel.

A dilution of engine oil through fuel has by changing the lubricating properties of engine oil have a great influence on one Engine wear of a Motor vehicle with an internal combustion engine. This can be too serious Durability issues for lead the engine. That's why the oil change intervals for example, limited to 15,000 km or an annual oil change, if less Mileage is present. This happens at the expense of higher operating costs and a larger oil consumption. An increase the oil change interval, To reduce operating costs is advantageous compared with fixed oil change intervals for all Car owners. An in-vehicle monitoring system it would allow the Need to change the oil to perform to adapt the driving behavior of the drivers.

Various operating conditions and events during of vehicle operation are for the dilution of the engine oil responsible with fuel. For example, this may be cylinder injection (i.e., the injection of additional Fuel in all or some cylinders after the main injection while of the power stroke), more often Operation with cold engine (short distance operation) and generally the Operation of a vehicle with diesel engine.

The Cylinder injection represents an efficient method to to increase the exhaust gas temperature and / or to achieve a rich engine operation and at the same time a neutral torque for the maintain current operating status. This will u. A. used for the periodic burning of deposits in a diesel particulate filter or for producing rich mixtures to NOx catalysts regenerate.

In dependence the injection quantity and the beginning of the post-injection into the power stroke Part of the injected fuel mixes with the oil film the cylinder wall and thereby passes into the engine sump, causing a dilution of the engine oil is produced. The oil dilution, the caused by each cylinder injection is greater for delayed injections and for a variety of such injections. Furthermore, one occurs higher dilution at lower oil temperatures and for fuels with a higher Proportion of heavier hydrocarbons, as the lighter Components evaporate again from the engine oil. It follows that the dilution in the case of diesel fuel Gasoline is bigger. Of Further, vehicle operating patterns significantly affect the oil dilution problem. Frequent cold starts and short ways can to oil dilutions to lead, the five times are higher as with completely heated operating patterns. Engine wear or even engine damage can especially occur when looking for an urban driving pattern with low power and low speed, that too high dilution to lead can, a highway operation with full load follows, because then u. U. the Lubricating properties of engine oil not can be given more sufficiently. The problem will be even more strengthened when equipped with diesel engines with a particulate filter are, in addition the particle filter is to be regenerated or in an internal combustion engine with lean NOx purification, the regeneration by means of rich operation carried out shall be. This would then additional dilution of the engine oil and thus possibly an actual damage mean the engine.

in the Prior art has been the problem of determining the dilution of the engine oil represented such that the Main focus is on creating a monitoring, taking care of it the fuel flow rate in the oil and monitors the rate of escape of the fuel from the oil is determined, and thus a current dilution of the engine oil becomes. Such a monitoring system is then used to give the driver the need for an oil change display. Such a system is inflexible and inadequate damage should be already excessive dilution.

Of the Invention has for its object to provide a method with a dilution of the engine oil and control the dilution and / or dilution rate of the engine oil takes place, whereby at the same time the interval until the next oil change is optimized.

According to the invention Task solved by the existence future degree of dilution of the engine oil is determined with fuel, wherein at least one of the determination data is prediction based and that based on the dilution levels dilution event suspended or carried out becomes.

On This way will cause you to be flexible on the expected dilution can be reacted and at the same time there is the possibility of certain events in certain situations to avoid damage.

Another teaching of the invention provides that based on the dilution levels little a threshold is determined based on its compliance with the execution of the dilution event. By limiting value calculation can be easily form a criterion for suspension.

Purposeful in mind the invention is that a Composition of the fuel and / or a type of fuel in determining the future dilution degree considered become. This increases the accuracy of the result, since hydrocarbons different depending on the size to the total dilution contribute.

Favorable Way is provided that a distance until the next oil change and / or the time until the next oil change in determining the future degree of dilution is taken into account which is preferably the current distance and / or time. This also increases the accuracy of the result, since the total dilution only at the time of the next oil change Maximum allowed shall be.

A Further teaching of the invention provides that a dilution increase in performing the dilution event and the number of dilution events until the next oil change in determining the future dilution degree considered become. This increases also the accuracy of the result.

Purposeful in mind The invention is that it at the dilution event is a regeneration of a diesel particulate filter and / or a NOx / SOx storage medium, the preferred by a delayed Injecting fuel into a cylinder of the engine takes place.

better Way is provided that a Motor oil volume in determining the future degree of dilution considered is, which is preferably the current and / or a filled engine oil volume at the last engine oil change is.

A Further teaching of the invention provides that at least one average value several events and / or at least one value of a last event for the Prediction can be used. This also increases the accuracy of the result.

Further Advantageous embodiments of the invention are in the dependent claims and the following description of the figures disclosed. Show it

1 a block diagram of an implementation of a method according to the invention, and

2 to 10 each a flowchart of the individual blocks.

The predictive control according to the invention is based on function blocks according to the 1 whose operation is described below. The blocks are processed one after the other.

The blocks are a reset block 1 , an integrate block 2 , an MOil block 3 , a CurrentOilDil block 4 , a DeNOxDil block 5 , a NumDeSoxotNextOilChange block 6 , a DeSoxAvrgDil block 7 , a DeSOxP2PDil block 8th , a PredictOilDil block 9 and an OilDilLimits block 10 ,

The reset block 1 is used to reset the monitoring in the form of the method according to the invention, superordinate as a function of an oil change. If an oil change has been carried out, the system is reset to the initial position with regard to the dilution ( 85a to 85c ).

• – Zeit und Abstand seit dem letzten Ölwechsel,
• – aktuelle Kraftstoffmenge im Öl als eine Funktion der Rate des Kraftstoffzuflusses in das Öl (mfuel_mlps_dil 108),
• – Rate der Kraftstoffrückgewinnung aus dem Öl (beispielsweise durch Verdunstung),
• – Kraftstoffzusammensetzung (Anteil leichterer und schwerere Kohlenwasserstoffe), und
• – Zeit und Distanz bis zum nächsten Ölwechsel als eine Funktion der Zeit und Distanz seit dem letzten Ölwechsel, gewünschtem Ölwechselintervall 83 und Durchschnittsfahrzeuggeschwindigkeit 84.

The integrate block 2 ( 2 ) is used to calculate various program output parameters. This is:

• - time and distance since the last oil change,
• - actual fuel quantity in the oil as a function of the rate of fuel flow into the oil (mfuel_mlps_dil 108 )
• Rate of fuel recovery from the oil (for example by evaporation),
• - Fuel composition (proportion of lighter and heavier hydrocarbons), and
• - Time and distance to the next oil change as a function of time and distance since the last oil change, desired oil change interval 83 and average vehicle speed 84 ,

The MOil block 3 ( 3 ) is used to calculate the actual and predicted oil volumes as a function of the original fill volume, the rate of oil consumption, and the predicted mileage until the next oil change such as the predicted driving conditions based on a calculated driving profile history stored over a large number of trips; to calculate.

The CurrentOilDil block 4 ( 4 ) is used to calculate the current oil dilution at time t as a function of the volume of the current fuel in the oil and the current volume of oil.

• – der Zeit bis zum nächsten Ölwechsel,
• – der gegenwärtigen Kraftstoffmenge im Öl,
• – der Rückgewinnung des Kraftstoffs aus dem Öl,
• – der Kraftstoffzusammensetzung,
• – der Rate des Eintretens des Kraftstoffs ins Öl berechnet aus der letzten Zylindernacheinspritzungsverdünnung (in ml) geteilt durch die Zeit seit der letzten Zylindernacheinspritzung (Dieses wird verwendet, um eine Kurzzeitvorhersage des Kraftstoffanteils im Öl beim nächsten Ölwechsel vorherzusagen, d. h. falls eine Zylindernacheinspritzung zum gegenwärtigen Zeitpunkt t auftreten würde unter Annahme vielfacher identischer Zylindernacheinspritzungen, die über eine Zeitperiode bis zum nächsten Ölwechsel auftreten würden.), und
• – der Rate des durchschnittlichen Eintretens des Kraftstoffs ins Öl über eine Anzahl von Zylindernacheinspritzungskreisläufen, wobei eine Aufzeichnung der Zylindernacheinspritzungen verwendet wird, um einen Durchschnittswert zu berechnen (Dieses wird verwendet, um eine Langzeitvorhersage des Kraftstoffanteils im Öl beim nächsten Ölwechsel zutreffen. Hierbei wird eine Annahme getroffen, daß eine Anzahl von Zylindernacheinspritzungen (beispielsweise 10) in dem Zeitintervall bis zum nächsten Ölwechsel durchgeführt wird, um den Kraftstoffanteil im Öl beim nächsten Ölwechsel vorherzusagen).

The DeNoxDil block 5 ( 5 ) is used to detect a frequent dilution event (eg, a fat operation for the regeneration of a NOx purification cleaning medium) to determine a short-term and long-term fuel oil prediction at the next oil change as a function

• - the time until the next oil change,
• - the current amount of fuel in the oil,
• The recovery of the fuel from the oil,
• The fuel composition,
• The rate of fuel to oil count calculated from the last cylinder injection dilution (in ml) divided by the time since the last cylinder injection (This is used to predict a short term prediction of the fuel fraction in the oil at the next oil change, ie if one cylinder injection at the present time t would occur assuming multiple identical cylinder injections that would occur over a period of time until the next oil change.), and
• The rate of average fuel input into the oil over a number of cylinder injection circuits, where a record of the cylinder injections is used to calculate an average value (This is used to apply a long term fuel oil prediction at the next oil change made a number of cylinder injections (eg, 10) in the time interval until the next oil change is made to predict the fuel fraction in the oil at the next oil change).

The NumDeSoxtoNextOilChange block 6 ( 6 ) is used to estimate the number of non-frequent dilution events (eg, for a period of 10 to 30 minutes every 10 to 50 hours) e.g. For diesel particulate filter regeneration or NOx storage medium desulfurization. This block calculates a short term number of dilution events as a function of time until the next oil change divided by the time since the last regeneration event. Furthermore, a long term number of dilution events is calculated as a function of the time between the last number of regeneration events (the last ten events) divided by the number until the next oil change.

• – der Langzeitanzahl von Regenerationen vorhergesagt bis zum nächsten Ölwechsel,
• – der Kraftstoffzusammensetzung,
• – der Zeit bis zum nächsten Ölwechsel,
• – des gegenwärtigen Kraftstoffanteils im Öl,
• – des Kraftstoffeintritts ins Öl pro Regenerationsereignis (in ml) als Erfahrungswert aus einer Anzahl von Regenerationsereignissen, und
• – der Rückgewinnung des Kraftstoffs aus dem Öl.

The DeSOxAvrgDil block 7 ( 7 ) is used to predict long-term predictions of fuel in the oil at the next oil change. It takes the number of last regeneration events until the next oil change. This is calculated as a function

• - the long-term number of regenerations predicted until the next oil change,
• The fuel composition,
• - the time until the next oil change,
• - the actual proportion of fuel in the oil,
• - the fuel entry into the oil per regeneration event (in ml) as empirical value from a number of regeneration events, and
• - the recovery of the fuel from the oil.

• – der Kurzeitanzahl von Regenerationsereignissen vorhergesagt bis zum nächsten Ölwechsel,
• – der Kraftstoffzusammensetzung,
• – der Zeit bis zum nächsten Ölwechsel,
• – des gegenwärtigen Kraftstoffanteils im Öl,
• – Kraftstoff im Öl pro Regenerationsereignis (ml) für das letzte Ereignis, und
• – der Rückgewinnung des Kraftstoffs aus dem Öl.

The DeSOxP2PDil block 8th ( 8th ) is used to calculate the short-term prediction of the fuel in the oil at the next oil change. It is assumed that the regeneration event occurs repeatedly at the present time until the next oil change. This is calculated as a function

• The number of times of regeneration events predicted until the next oil change,
• The fuel composition,
• - the time until the next oil change,
• - the actual proportion of fuel in the oil,
• - Fuel in oil per regeneration event (ml) for the last event, and
• - the recovery of the fuel from the oil.

• – Vorhersage einer prozentualen Ölverdünnung als Funktion von – angenommenem Kraftstoffanteil im Öl beim nächsten Ölwechsel ausgehend von gegenwärtigem Kraftstoffanteil im Öl, – Langzeitverdünnung durch häufig auftretende Verdünnungsereignisse, – Langzeitverdünnung durch weniger häufig auftretende Verdünnungsereignisse, und – Vorhersage des Ölvolumens beim nächsten Ölwechsel;
• – Kurzzeitvorhersage der prozentualen Ölverdünnung für häufiger auftretende Verdünnungsereignisse als Funktion von – angenommenem Öl im Kraftstoff beim nächsten Ölwechsel ausgehend vom gegenwärtigen Kraftstoff im Öl, – Kurzzeitverdünnung für häufige Verdünnungsereignisse, und – vorhergesagtem Ölvolumen beim nächsten Ölwechsel; sowie
• – Kurzzeitvorhersage des Ölverdünnungsprozentsatzes für weniger häufige Verdünnungsereignisse als Funktion von – vorhergesagtem Öl im Kraftstoff beim nächsten Ölwechsel ausgehend vom gegenwärtigen Kraftstoff im Öl, – Kurzzeitverdünnung für weniger häufige Verdünnungsereignisse, und – vorhergesagtem Ölvolumen beim nächsten Ölwechsel.

The PredictOilDil block 9 ( 9 ) is used to calculate the predicted fuel fraction in the oil at the next oil change as follows. The following statements are calculated:

• - prediction of percent oil dilution as a function of - assumed fuel fraction in the oil at the next oil change from the current fuel fraction in the oil, - long term dilution by frequent dilution events, - long term dilution due to less frequent dilution events, and - oil volume prediction at the next oil change;
• - Short term prediction of the percent oil dilution for more frequent dilution events as a function of - assumed oil in the fuel at the next oil change from the current fuel in the oil, - short term dilution for frequent dilution events, and - predicted oil volume at the next oil change; such as
• - Short term oil dilution percentage prediction for less frequent dilution events as a function of - Predicted oil in fuel at next oil change from current fuel in oil, - Short term dilution for less frequent dilution events, and - Predicted oil volume at next oil change.

• – Falls für die gegenwärtige und/oder vorhergesagte Ölverdünnung ein zuvor genannter Grenzwert 68, 70, 71, 96, 97 überschritten wird, würde ein stark verdünnendes Betriebsereignis in der Motorbetriebssteuerung ausgesetzt, und falls dann ein zweiter Grenzwert überschritten wird, müßten weitere Ereignisse ausgesetzt werden und falls ein dritter Grenzwert überschritten würde, müßten alle Verdünnungsereignisse gestoppt werden (Gleichbedeutend mit: es sollte sofort ein Ölwechsel durchgeführt werden).
• – Eine Kurzzeitölverdünnungsvorhersagen für häufiger oder weniger häufig auftretende Ereignisse wird als eine Bedingung eingestellt, um das nächste Ereignis auszusetzen, falls die Kurzzeitvorhersage einen Grenzwert überschreitet, wobei diese Bedingung überstimmt werden kann, falls wichtigere weitere Voraussetzungen gegeben sind, die das Durchführen des Verdünnungsereignisses notwendig machen.

The OilDilLimits block 10 ( 10 ) calculates logical tag values to check if a Specific dilution event should be performed or suspended as a function of the current and predicted fuel fraction in the oil at the next oil change. Based on this logical marking value, a comparison is carried out with predetermined limit values.

• - If for the current and / or predicted oil dilution a previously mentioned limit 68 . 70 . 71 . 96 . 97 is exceeded would expose a severely dilutive operating event in the engine operation control, and if a second limit is exceeded then further events would have to be suspended and if a third limit were exceeded all dilution events would have to be stopped (synonymous with: an oil change should be performed immediately become).
• A short term oil dilution prediction for more frequent or less frequent events is set as a condition to suspend the next event if the short term prediction exceeds a threshold, which condition may be overruled if more important further prerequisites are required that necessitate the performance of the dilution event ,

following the individual blocks are under With the help of the figures explained in more detail.

With The reset block resets the calculation system.

With the Integrate block ( 2 ) calculates certain program output parameters that will be used in subsequent blocks. This is the time that has elapsed since the last oil change (time_since_last_oil_change 11 ), the distance that has elapsed since the last oil change (dist_since_last_oil_change 12 ), the fuel dilution in the oil at the present time for the light hydrocarbons and for the heavy hydrocarbons (current_mfuel_dil_L 13 and current_mfuel_dil_H 14 ), as well as the distance and time until the next desired oil change (dist_to_next_oil_change 15 and time_to_next_oil_change 16 ). Dividing the dilution into heavy and light hydrocarbons makes sense, as the light hydrocarbons escape from the oil more quickly ("evaporating") than the heavy ones, which remain longer in the oil, and thus contribute more to the dilution problem.

time_since_last_oil_change 11 is determined, in which a comparison between the original time of the last oil change (ini_time_last_oil_change 73 ) with the current time of the last oil change (time_last_oil_change / NV 76 ) and via a known integrator 77 time_since_last_oil_change 11 (= time_last_oil_change / NV 76 ) is output. For dist_since_last_oil_change 12 will be shortly ( 79 . 80 . 77a ) method, in addition to the vehicle speed 78 (vehSpd) is taken into account.

With the moil block 3 ( 3 ) is the actual current amount of oil in the engine (current_eng_oil 17 = moil 26 ) and a prediction about the amount of oil remaining in the engine at the next oil change (predict_eng_oil 18 ), determined. This is dist_last_oil_change / NV 80 with the rate of oil consumption (rate_oil_consum 20 ), whereby the actual oil consumption since the last oil change (moil_consum 21 ) is determined. This is calculated from the original amount of oil (ini_moil 22 ) deducted at the last oil change. For predicting the amount of oil in the engine at the next oil change (predict_eng_oil 18 = moil_p 23 ), becomes dist_next_oil_change 24 with rate_oil_consum 20 multiplied and moil 26 subtracted, causing moil_p 23 is predicted.

With the CurrentOilDil block 4 ( 4 ) determines the actual dilution of the fuel in the engine oil (current_perc_oil_dil 28 = CurrentPercentOilDil 72 ). With the from the Integrate block 2 certain parameters mfuel_dil_L / NV 81 and mfuel_dil_H / NV 82 On the one hand, the total amount of fuel and oil (OilpFuel_Est 27 = oilfuel_buff 86 ) and determines a percentage of the fuel in the oil at the current time (current_perc_oil_dil 28 ) by adding the sum of mfuel_dil_L 81 and mfuel_dil_H 82 by OilpFuel_Est 27 is shared.

With the DeNoxDil block 5 ( 5 ) determines, on the one hand, the actually prevailing dilution quantity of the fuel in the oil, divided into light (mfuel_dil_denox_L_p 34 ) and heavy (mfuel_dil_denox_H_p 35 ) Hydrocarbons, on the other hand, a prediction is made as to how large the amount of fuel in the oil will be on average at the next oil change, again divided into light (estimated_mfuel_dil_L 88 = mfuel_dil_L_e 32 ) and heavy (estimated_mfuel_dil_H 89 = mfuel_dil_H_e 33 ) Hydrocarbons, and further, a prediction is made as to how large the dilution of the oil with fuel from the last dilution event is also divided into light (mfuel_dil_denox_L_p2p 37 ) and heavy (mfuel_denox_dil_H_p2p 58 ) Hydrocarbons. The dilution event considered in this block is the dilution that occurs during greasing engine operation by post-injection for denitrification regeneration (DeNOx).

The time until the next oil change time_next_oil_change 29 becomes with the fuel recovery mfuel_dil_rec_L 30 or mfuel_dil_rec_H 31 linked and the result by means of a curve 87 evaluated. To calculate the total fuel quantity at the time of the next oil change mfuel_dil_L_e 32 or mfuel_dil_H_e 33 the value is in the Integrate block 2 determined fuel dilution quantity mfuel_dil_L / NV 81 or mfuel_dil_H / NV 82 connected.

To predict the fuel dilution amount when performing the DeNOx event mfuel_dil_denox_L_p 34 or mfuel_dil_denox_H_p 35 , again broken down into light and heavy hydrocarbons, the average fuel flow rate between two DeNOx events (avrg_p2p_denox_mfuel_mlps_dil 36 ) with the fuel recovery mfuel_dil_rec_L 30 or mfuel_dil_rec_H 31 linked and then with the result of the curve evaluation 87 to determine mfuel_dil_L_e 32 or mfuel_dil_H_e 33 connected.

To determine the fuel dilution amount between two DeNOx events mfuel_dil_denox_L_p2p 37 or mfuel_dil_denox_H_p2p 58 , again divided in terms of light and heavy hydrocarbons, the average flow rate of fuel in oil between two DeNOx events (avrg_p2p_denox_mfuel_mlps_dil 36 ) with the fuel recovery mfuel_dil_rec_L 30 or mfuel_dil_rec_H 31 linked and then with the result of the curve evaluation 87 to determine mfuel_dil_L_e 32 or mfuel_dil_H_e 33 and the average inflow fuel into the oil of the last DeNOx event p2p_denox_mfuel_mlps_dil 38 connected.

As a result of the NumDeSoxotNextOilChange block 6 ( 6 ) is the number of less frequently occurring events (num_desoxot_to_next_oil_change 39 = num_desoxot_next_oil_change 51 ) until the next oil change. These include the cleaning of a diesel particulate filter and / or the desulphurisation of a NOx storage medium. This will be time_next_oil_change 29 with the average time between two rarer dilution events (avrg_time_desoxot_p2p 40 ), eg 10h, and with the maximum number of DeSoxot events (max_num_desoxot_ct 41 ) within the period until the next oil change. Furthermore, the number of intermediate periods between two DeSoxot events (num_desoxot_p2p_next_oil_change 42 ) certainly. This will be time_next_oil_change 29 with the time since the last DeSoxot event (time_since_last_desoxot 57 ) and the maximum number of events between events (max_num_desoxot_p2p_ct 43 ) connected.

Through the DeSOxAvrgDil block 7 ( 7 ), the average dilution that occurs in a DeSoxot event is predicted. The prediction is divided into a dilution with lighter and heavier hydrocarbons of the fuel (mfuel_dil_desoxot_L_p 44 and mfuel_dil_desoxot_H_p 45 ). For prediction, an average dilution of the oil with lighter and heavier hydrocarbons of the fuel is determined (avrg_mfuel_dil_desoxot_L_p 46 and avrg_mfuel_dil_desoxot_H_p 47 ). This is done by linking an average dilution to a DeSoxot event (avrg_mfuel_dil_desoxot 48 ), this value being formed over a longer period of time. avrg_mfuel_dil_desoxot 48 is used with the proportion of light or heavy hydrocarbons of the fuel (fac_mfuel_L 49 and fac_mfuel_H 50 ) connected. It will then be time_next_oil_change 29 (= exponent_buff 92 avrg_time_desoxot_p2p 40 deducted. This value is calculated in each case with the recovery or the escape of the fuel from the oil for lighter and heavier hydrocarbons (mfuel_dil_rec_L 30 and mfuel_dil_rec_H 31 ) and via a function 87 evaluated. Subsequently, the value obtained with avrg_mfuel_dil_desoxot_L_p 46 or avrg_mfuel_dil_desoxot_H_p 47 connected. The determination is made overall iteratively, so that then mfuel_dil_desoxot_L_p 44 or mfuel_dil_desoxot_H_p 45 is added, this value being 0 at the first determination cycle. The prediction and thus the iteration are terminated if num_desoxot_next_oil_change ( 51 ) 0 becomes.

Through the DeSoxP2PDil block 8th ( 8th ), the dilution that occurs between two DeSoxot events is predicted. The prediction is divided into a dilution with lighter and heavier hydrocarbons of the fuel (mfuel_dil_desoxot_L_p2p 52 and mfuel_dil_desoxot_H_p2p 53 ). For prediction, an average dilution of the oil with lighter and heavier hydrocarbons of the fuel is determined (avrg_mfuel_dil_desoxot_L_p2p 54 and avrg_mfuel_dil_desoxot_H_p2p 55 ). This is done by linking an average dilution to a last DeSoxot event (mfuel_dil_last_desoxot 56 ). mfuel_dil_last_desoxot 56 is used with the proportion of light or heavy hydrocarbons of the fuel (fac_mfuel_L 49 and fac_mfuel_H 50 ) connected. It will then be time_next_oil_change 29 the time since the last DeSoxot event (time_since_last_desoxot 57 ) deducted. This value is in each case with the recovery or the escape of the fuel from the oil for lighter and heavier hydrocarbons (mfuel_dil_rec_L 30 and mfuel_dil_rec_H 31 ) and via a function 87 evaluated. Then the value obtained with avrg_mfuel_dil_desoxot_L_p2p 54 or avrg_mfuel_dil_desoxot_H_p2p 55 connected. The determination is done in total iteratively, so that then mfuel_dil_desoxot_L_p2p 52 or mfuel_dil_desoxot_H_p2p 53 is added, this value being 0 at the first determination cycle. The prediction and thus the iteration are terminated if num_desoxot_p2p_next_oil_change ( 42 ) 0 becomes.

With the PredictOilDil block 9 ( 9 ) is predicted from the previously determined parameters, the fuel dilution of the oil at the time of the next oil change. This is done once based on average values (predict_perc_oil_dil 59 = PredictPercentOilDil 93 ), based on the values of the DeNOx events starting from the last event (predict_perc_oil_dil_denox_p2p 60 = PredictPercentOilDilDenoxP2P 94 ) and based on the values of the DeSoxot events starting from the last event (predict_perc_oil_dil_desoxot_p2p 61 = PredictPercentOilDilDesoxotP2P 95 ).

For predicting predict_perc_oil_dil 59 a dilution sum is formed from mfuel_dil_L_e 32 , mfuel_dil_H_e 33 , mfuel_dil_denox_L_p 34 , mfuel_dil_denox_H_p 35 (all from the DeNOxDil block 5 according to 5 ) and avrg_mfuel_dil_desoxot_L_p 46 and avrg_mfuel_dil_desoxot_H_p 47 (each from the DeSOxAvrgDil block 7 according to 7 ). This sum is calculated with the predicted engine oil moil_p 23 from the moil block 3 according to 3 connected.

For the prediction of perdict_perc_oil_dil_denox_p2p 60 a dilution sum is formed from mfuel_dil_L_e 32 , mfuel_dil_H_e 33 , mfuel_dil_denox_L_p2p 37 and mfuel_dil_denox_H_p2p 58 (all from the DeNOxDil block 5 according to 5 ). This sum is calculated with the predicted engine oil moil_p 23 from the moil block 3 according to 3 connected.

For the prediction of perdict_perc_oil_dil_desoxot_p2p 61 a dilution sum is formed from mfuel_dil_L_e 32 , mfuel_dil_H_e 33 (each from the DeNOxDil block 5 according to 5 ) and mfuel_dil_desoxot_L_p2p 52 and mfuel_dil_desoxot_H_p2p 53 (each from the DeSoxP2PDil block 8th according to 8th ). This sum is calculated with the predicted engine oil moil_p 23 from the moil block 3 according to 3 connected.

With the OilDilLimits block 10 ( 10 ), logic values (lg_current_oil_dil_lim 62 , lg_current_dil_desox_lim 63 , lg_predict_oil_dil_lim 64 , lg_predict_perc_denox_p2p 65 and lg_predict_perc_desoxot_p2p 66 ) determines whether the current_perc_oil_dil 28 ( 4 ), predict_perc_oil_dil 59 , perdict_perc_oil_dil_denox_p2p 60 and perdict_perc_oil_dil_desoxot_p2p 64 (each 9 ) the associated limits predict_perc_oil_dil_lim 68 , predict_perc_oil_dil_desox_lim 69 , perdict_perc_oil_dil_denox_p2p_lim 70 and perdict_perc_oil_dil_desoxot_p2p_lim 71 comply. If this is the case, the logic values are set to true otherwise to false. The limits predict_perc_oil_dil_lim 68 , perdict_perc_oil_dil_denox_p2p_lim 70 and perdict_perc_oil_dil_desoxot_p2p_lim 71 will be based on dist_next_oil_change 24 certainly. For lg_predict_perc_denox_p2p 65 and lg_predict_perc_desoxot_p2p 66 an overriding option is provided, with which a higher-level module 113 respectively. 115 is able to set the adherence to a limit to true, although the actual value would be false if certain legal provisions or the like make the execution of the event mandatory.

Subsequently, a hierarchical evaluation of the logic values 62 to 66 to obtain a link between the values, thereby increasing the accuracy of deciding whether an event should be executed 98 . 99 . 100 . 101 in that it causes dilution of the engine oil during its execution. If false, the event is executed. If true, the event will not be executed 102 . 103 . 104 . 105 . 106 . 107 ,

1

Reset block

2

Integrate block

3

Moil block

4

CurrentOilDil block

5

DeNOxDil block

6

NumDeSoxotNextOilChange block

7

DeSxAvrgDil block

8th

DeSOxP2PDil block

9

PredictOilDil block

10

OilDilLimits block

11

time_since_last_oil_change

12

dist_since_last_oil_change

13

current_mfuel_dil_L

14

current_mfuel_dil_H

15

dist_to_next_oil_change

16

time_to_next_oil_change

17

current_eng_oil

18

predict_eng_oil

19

20

rate_oil_consum

21

moil_consum

22

ini moil

23

moil_p

24

dist_next_oil_change

25

26

moil

27

OilpFuel_Est

28

current_perc_oil_dil

29

time_next_oil_change

30

mfuel_dil_rec_L

31

mfuel_dil_rec_H

32

mfuel_dil_L_e

33

mfuel_dil_H_e

34

mfuel_dil_denox_L_p

35

mfuel_dil_denox_H_p

36

avrg_p2p_denox_mfuel_mlps_dil

37

mfuel_dil_denox_L_p2p

38

p2p_denox_mfuel_mlps_dil

39

num_desoxot_to_next_oil_change

40

avrg_time_desoxot_p2p

41

max_num_desoxot_ct

42

num_desoxot_p2p_next_oil_change

43

max_num_desoxot_p2p_ct

44

mfuel_dil_desoxot_L_p

45

mfuel_dil_desoxot_H_p

46

avrg_mfuel_dil_desoxot_L_p

47

avrg_mfuel_dil_desoxot_H_p

48

avrg_mfuel_dil_desoxot

49

fac_mfuel_L

50

fac_mfuel_H

51

num_desoxot_next_oil_change

52

mfuel_dil_desoxot_L_p2p

53

mfuel_dil_desoxot_H_p2p

54

avrg_mfuel_dil_desoxot_L_p2p

55

avrg_mfuel_dil_desoxot_H_p2p

56

mfuel_dil_last_desoxot

57

time_since_last_desoxot

58

mfuel_dil_denox_H_p2p

59

predict_perc_oil_dil

60

predict_perc_oil_dil_denox_p2p

61

predict_perc_oil_dil_desoxot_p2p

62

lg_current_oil_dil_lim

63

lg_current_dil_desoxot_lim

64

lg_predict_oil_dil_lim

65

lg_predict_perc_denox_p2p

66

lg_predict_perc_desoxot_p2p

67

68

predict_perc_oil_dil_lim

69

predict_perc_oil_dil_desox_lim

70

predict_perc_oil_dil_denox_p2p_lim

71

predict_perc_oil_dil_desoxot_p2p_lim

72

current_percent_oil_dil

73

ini_time_last_oil_change

74

75

76

time_last_oil_change / NV

77

Integratot ( 77 to 77c )

78

VEHSPD

79

ini_dist_last_oil_change

80

dist_last_oil_change / NV

81

mfuel_dil_L / NV

82

mfuel_dil_H / NV

83

oil_change_distance

84

avrg_veh_spd

85

85a = lg_reset; 85b = lg_upload_eprom; 85c = LgEngineStart

86

oilpfuel_buff

87

Curve (Evaluation)

88

estimated_mfuel_dil_L

89

estimated_mfuel_dil_H

90

91

92

exponent_buff

93

PredictPercentOilDil

94

PredictedPercentOilDilDenoxP2P

95

PredictPercentOilDilDesoxotP2P

96

current_perc_oil_dil_lim

97

current_perc_oil_dil_desox_lim

98

LgEnableDenoxOilDilLim

99

LgEnableDesoxotOilDilLim

100

LgEnableDesoxOilDilLim

101

LgEnableDesoxotOilDilLimP2P

102

LgDisableDenoxOilDilLim

103

LgDisableDesoxotOilDilLim

104

LgDisableDesoxOilDilLim

105

LgDisableDesoxotOilDilLimP2P

106

LgDisableReqPredictedOilDilLim

107

LgDisableFCLOOilDilLim

108

mfuel_mlps_dil

109

lg_ena_ini_mfuel_dil

110

fac_rest_oil_ct

111

ini_mfuel_dil_L

112

ini_mfuel_dil_H

113

lg_desoxot_req

114

mfuel_dil_curr_desoxot

115

lg_denox_req

Claims (9)

A method for controlling an engine oil dilution of an internal combustion engine, in particular a motor vehicle, in which a current dilution degree of the engine oil is determined with fuel, characterized in that a future dilution degree of the engine oil is determined with fuel, wherein at least one of the determination data is prediction-based, and that dilution is subject to a dilution event or performed. Method according to claim 1, characterized in that that based at least at the dilution levels a limit is calculated based on its compliance with the execution of the dilution event is decided. Method according to claim 1 or 2, characterized that one Composition of the fuel and / or a type of fuel in determining the future dilution degree considered becomes. Method according to one of claims 1 to 3, characterized that one Distance until the next oil change and / or the time until the next oil change in determining the future degree of dilution considered which is preferably the current distance and / or time is. Method according to one of claims 1 to 4, characterized the existence dilution gain when performing of the dilution event and the number of dilution events until the next oil change in determining the future dilution degree considered becomes. Method according to one of claims 1 to 5, characterized that it at the dilution event to a regeneration of a diesel particulate filter and / or a NOx / SOx storage medium, preferably by delayed injection of fuel into a cylinder of the engine takes place. Method according to one of Claims 1 to 6, characterized the existence Driving profile that over a past period was saved in the investigation of the future dilution degree considered becomes. Method according to one of claims 1 to 7, characterized the existence Engine oil volume at the determination of the future dilution degree considered is, which is preferably the current and / or a filled engine oil volume at the last engine oil change is. Method according to one of claims 1 to 8, characterized that at least an average of several events and / or at least one Value of a last event for the prediction will be used.