DE102013211346A1 - Method for carrying out a special mode for a motor vehicle - Google Patents

Abstract

The invention relates to a method for carrying out a special operating mode for a motor vehicle (2) while the motor vehicle (2) is traveling, in which a driving profile resulting from the journey is analyzed and compared with at least one known driving profile, the special operating mode being carried out when the driving profile identified while driving is suitable for carrying out the special operating mode.

Description

The invention relates to a method and an arrangement for carrying out a special mode of operation for a motor vehicle.

State of the art

Different software functions for detecting favorable operating conditions and / or operating points for specific applications of a motor vehicle are known from the prior art. If a favorable operating condition and a favorable operating point are detected, measures derived therefrom can be taken.

In general, the motor vehicle is operated in a normal mode, with all the usual functions of the motor vehicle can be used without restriction. When performing a special mode, special functions that are otherwise disabled can be performed.

This concerns measures that z. For example, raising an exhaust gas temperature or adjusting a required lambda value of a mixture ratio for a mixture of fuel and air. The measures are replaced by a modified control of existing in the system actuators, such. a. a turbocharger actuator, a throttle, an EGR exhaust gas recirculation (EGR) valve, injectors, an ignition, a valve actuator, a pressure control valve, a fuel pump, a secondary air pump, and / or bypass dampers, through which engine control effects. A special mode can u. a. be requested from a diagnosis of a component or to a conditioning of a component.

Disclosure of the invention

Against this background, a method and an arrangement with the features of the independent claims are presented. Further embodiments of the invention will become apparent from the dependent claims and the description.

With the method u. a. a prediction (prediction) of a driving profile of a motor vehicle during a journey possible, whereby a control of an engine and / or an exhaust system can be performed in a forward-looking manner. This driving profile is usually based on at least a part of an already traveled, identified as known route identified and thus to predict.

Due to the possibility of recognizing a current route to be traveled by the motor vehicle and / or in the future, switching between different operating modes, for example between a normal mode of operation and a special mode of operation, which can also be designated as a special operating function, can be influenced by the motor vehicle. As a rule, certain operating modes can only be carried out depending on the driving profile, it being possible to carry out a conceivable operating mode with one possible driving profile, whereas this operating mode should be avoided in the case of another possible driving profile. Which of the possible driving profiles results from a current and / or future journey can be determined by recognizing the route. Some operating modes and / or special operating modes can also be carried out simultaneously in an embodiment. In a special operating mode, in contrast to a normal operating mode, for example, an active diagnosis can be carried out, with an active diagnosis influencing the operation of the motor vehicle. Alternatively or additionally, a special operating mode can also be carried out for exhaust gas aftertreatment.

This concerns z. Example, designed as a diesel particulate filter (DPF) regeneration operating mode, which requires an increase in the exhaust gas temperature for a certain period of time depending on an operating point. Accordingly, such conditioning of active exhaust aftertreatment components as operating mode no longer has to be abruptly aborted, since an expected, either suitable or unsuitable driving profile can now be predicted when continuing the journey.

In addition, for exhaust aftertreatment components to perform an active engagement, e.g. For example, for regeneration, a Einspeicherphase or a diagnosis as operating modes, certain values for operating parameters, eg. B. a temperature required for this purpose, a required loading or a mixing ratio for a combustion engine of the motor vehicle to be burned mixture of liquid fuel or fuel and air, a requisite mass flow, a required jump and / or transition between a rich and lean mixing ratio of the mixture can be maintained, since now a to be expected during the further journey driving profile, the values of these operating parameters conditional and / or influenced known. The values of the operating parameters can be preconditioned and therefore influenced depending on the driving profile. Under this condition, an intervention provided for the exhaust aftertreatment component can be performed inoperative without damaging it.

In an embodiment can thus fahrprofil- and / or operating point dependent an operating point (Point of operation) for a regeneration of a particulate filter and appropriate measures are selected. This also concerns necessary special operating modes for a NOx storage catalytic converter (NSC), which set a required lambda value of the mixing ratio and / or an exhaust gas temperature as operating parameter. It can also be further active intervention in a motor control, if z. B. an active diagnosis is necessary to be requested. For a lambda probe dynamics diagnosis, which defines the mixing ratio of the mixture to be combusted, and for a diagnosis of the oxygen storage capability of a three-way catalyst exhaust system in a gasoline engine, a required lambda value of the mixing ratio can be set as the operating parameter. For a diesel engine, an OxiCat diagnostic mode can be an active temperature adjustment to control the temperature as an operating parameter.

With the usually software-based feasible method can be determined by predicting the driving profile alternatively or additionally favorable conditions for switching from the full engine operation in the half-engine operation. If an operating mode should be provided in a partial load range, fuel consumption and emissions can be predicted as further operating parameters, since the half-engine operation is only to be carried out after a certain travel time in the partial load range.

Due to the prediction of the driving profile, a planned, special mode of operation can be requested in terms of time or delay, since it is now certain that conditions for a request of the operating mode to be carried out, as a rule a special operating mode, will be fulfilled during the further journey and thus its sequence will be successful.

In the context of the method, different, additional information, for example a prediction of a driving state, which can be driving profile-dependent, including a position of the motor vehicle, which is possible via a positioning system (GPS), a route recognition, a driver profile and / or current traffic data in a strategy for preconditioning for a mode of operation to be performed is included. Furthermore, predicted driving conditions and / or driving profiles are classified and a need for preconditioning prioritized.

In an embodiment of the method, a strategy for regeneration of the diesel particulate filter as an exhaust aftertreatment component is influenced so far that the regeneration during the ride can be completed and completed in any case, thereby reducing a number of aborted regenerations and fuel consumption is reduced. A strategy for switching from a full engine operation to a half engine operation may be influenced to the extent that such switching from a first to a second mode of operation is worthwhile, as a duration of a period while the motor vehicle is in the future profile in the driving profile can be predicted , In this case, it can be checked whether the time span of the drive and / or the driving profile which is required to implement the second operating mode continues and / or is maintained at least until the intended operating mode has been completed.

Here, it is considered that the switching of the consumption of fuel is increased, which is why a minimum duration for a half-engine operation of the internal combustion engine for amortization is required. Further, proportions of purely electric driving as one mode may be strategically influenced as compared to internal combustion engine driving in a hybrid vehicle as another mode, thereby avoiding very short switching between the two modes and increasing comfort to a driver. In addition, now a sailing operation, for example. At a start-stop coasting, be designed as a mode favorable. It is also possible to influence a metering strategy of a plant for selective catalytic reduction to the extent that an incorporation of a reducing agent is optimized, whereby its consumption and a risk of under- and / or overdose are reduced. Overall, the method can be used to optimize a strategy for the planning of a diagnosis, since, for example, B. is possible, as many diagnoses while subordinate driving profiles, which are classified according to a parent driving profile, which can also be referred to as a driving condition to perform.

With the method usually a fuel consumption and exhaust emissions, including CO ₂ emissions can be reduced. Components of the exhaust system are also less physically and / or thermally stressed, whereby their aging is reduced.

In addition, higher comfort properties are to be achieved for the driver of the motor vehicle, since an unnecessary change between operating modes is avoided and switches to cheaper modes and thus operating points or operating points can be laid. Planning and / or coverage of a diagnosis can also be made on acceptance, that is, on a driving profile-dependent change of a driving profile, starting from a driving profile that is favorable for the operating mode, to a driving profile unfavorable driving profile while maintaining a condition for the diagnosis.

A current route of a driving profile is determined automatically in the context of the method based on at least one already traveled section of the traveled route. For this purpose, no interaction with the driver is required, for. B. by entering a route in a navigation device.

With the method are repetitive routes, z. As the way to work, by recording and storing covered sections and striking values of operating parameters for the load, the speed and / or the exhaust gas temperature in the operating range to recognize. A repeating route can be determined on the basis of a characteristic for a course of at least one route-dependent and / or time-dependent operating parameter of the motor vehicle. This concerns z. For example, the characteristic on a way, eg. For a way from home to work, as well as a return and / or a reversal, for example. For a way from work to residence. A recognition of the way to or from the work is by detecting a time at which a ride is performed and / or started, d. H. by detecting a day of the week, usually a weekday, as well as to support the time, since a repeating route is usually traveled at the same times.

A characteristic of at least one operating parameter for a driving route is stored in a memory designed as a ring memory, for example in an EEPROM, a control device for the engine and / or the exhaust system of the motor vehicle, after their detection and / or recording when driving on the route. As a result, a plurality of routes and / or standardized routes can be stored and used. If a route and / or a driving profile is detected, an efficiency factor can be calculated for this, which can be used for a previous static operating point detection.

The efficiency factor indicates which operating point is to be expected at what time for what period of time in the currently recognized driving profile. This can be set at what time the implementation of a special mode, which requires a certain operating period for a certain period, is favorable, z. As a lower fuel consumption and / or lower emissions.

Furthermore, the method is to predict a future driving state and / or a future driving profile based on locating the motor vehicle, usually via a satellite-based positioning system such as GPS, on the route, on the basis of an already identified driver profile and / or on the basis of current traffic information. A classification of the predicted driving state and / or driving profile is based on the characteristic of the values for operating parameters, eg. B. for a load range, a dynamic range, an operating period, a possible engine life and / or a distance to the destination possible.

A preconditioning requirement is to be prioritized on the basis of classification, urgency and / or efficiency factor as well as a success factor, the success factor describing the efficiency factor. Conditioning functions can be released after planning based on prioritization. The success factor increases depending on the already traveled predicted distance and the thus increasing probability that a predicated distance will be driven on. In addition, a weighting of prediction inputs and / or prediction parameters is possible.

A changeover to a certain operating mode can now be planned since, on the basis of the predicted driving profile, also possible changes of operating conditions for a possible operating mode can be taken into account. Thus, it can be predicted how long an operating condition for a release for switching to the specific operating mode is given, since a development of at least one operating parameter to be taken into account based on a characteristic profile of this operating parameter is known.

Switching from the full engine operation to the half engine operation before a high load request and consequent overconsumption can be avoided since the switching is now performed at a suitable operating point. Also, a short-term switching to a purely electric operation to increase driving comfort can be avoided.

Overall, diagnoses can now be better planned, especially as some diagnoses can not be performed in parallel. This increases the time required to make diagnoses. In addition, by the method favorable conditions, eg. As a thrust, hybrid, start / stop and / or sailing operation, to perform diagnostics with regard to a sequence, eg. A time course, better planned. Thus, a higher number of successfully performed exhaust gas diagnoses can be achieved with a repetitive driving profile compared to a non-repeating driving profile.

In the case of a repetitive driving profile in which a DPF regeneration is started due to fulfilled static release conditions but can not be completed successfully, since the motor vehicle is turned off before the end of regeneration, results in increased fuel consumption and increased thermal load of the exhaust aftertreatment components. The start of this DPF regeneration can be prevented in a known driving profile or shifted to a more favorable driving profile. This ensures that DPF regeneration can be performed more frequently, reducing thermal stress and fuel consumption.

By including an external location system such as GPS, it is possible to shift a regeneration interval for a diesel particulate filter to a predicted highway as a possible route using a CRT (continuous regeneration trap) effect, thereby eliminating an active increase in temperature of the diesel particulate filter.

By including traffic information, triggering of an active regeneration upon detection of a traffic jam can be prevented since a load of the engine of the motor vehicle designed as an internal combustion engine in a traffic jam in terms of consumption and CO ₂ emissions is not achieved. Alternatively or additionally, triggering an emergency regeneration with connection thereto necessary consumer, eg. An air conditioner and / or a rear window heating, to achieve the required load is possible.

If an evaluation of the driving profile is included, an active increase in the temperature can be postponed by a defined period of time if, for a driving profile recognized on the basis of a characteristic of a driving route, a section of a partial route with a higher load is to be expected. When the driver profile is included, the active requirement of the temperature increase, for a driver driving at low load, for B. a retiree, by adding necessary consumers, eg. As the air conditioning and / or heated rear window, be increased.

A route is to be classified as known if they are driven by the motor vehicle at least once and their course is analyzed and / or recorded and stored. An analysis and / or detection of the route is possible at least on the basis of a course of a value of at least one operating parameter of the motor vehicle which regularly and / or inevitably results when driving on this route. This may, for example, be a kinematic operating parameter such as location or position, engaged gear and / or steering angle of the vehicle. At least one further kinematic operating parameter, which can be detected regularly and used to detect the route, is a speed and / or an acceleration which the motor vehicle can have when driving on the route.

Alternatively or additionally, at least one engine operating parameter of the motor vehicle, that is, to detect and analyze the driving route and / or the driving profile resulting from the driving route. H. an operating parameter of at least one component of an engine and thus also of the complete engine of the motor vehicle can be used. As this at least one engine operating parameters whose temperature, speed and / or consumption can be used.

When driving on the route or at least a part of the route, at least one of said operating parameters can be monitored and / or detected and a time-dependent course of the value can be analyzed and stored. In repeated, repeated driving on this route, the characteristic for the course of at least one, route-dependent and / or time-dependent operating parameter is determined. This characteristic usually results from a route-dependent course of limit values, ie. H. a minimum limit value and a maximum limit value, between which the course of the value of the operating parameter moves in a travel-dependent and / or time-dependent manner. The more often at least one section is traveled, the more accurate is the characteristic, usually by statistical evaluation, to capture and thus to determine.

Thus, it is possible to determine an operating-parameter-dependent characteristic for at least one section of at least one route and to assign this to at least one section. In a future drive of the motor vehicle, the value of at least one operating parameter can now be detected and / or monitored and its course can be compared with at least one known characteristic. If it is detected that the course corresponds to a specific characteristic, the at least one partial route is identified on the basis of the identified characteristic.

A route is in turn on the basis of at least one recognized section, usually on the basis of a regular sequence of several sections that form the route and be driven in a current ride successively.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

Short description of the drawing

1 shows a schematic representation of a motor vehicle for which an embodiment of the method is performed.

Embodiment of the invention

The invention is illustrated schematically with reference to an embodiment in the drawing and will be described below in detail with reference to the drawings.

1 shows a motor vehicle 2 that is a control unit 4 , An engine designed as an internal combustion engine 6 and an exhaust system 8th having. The control unit 4 is among other things designed to functions of the engine 6 as well as the exhaust system 8th to control and therefore to control and / or regulate. The control unit 4 In addition, it is designed to values of operating parameters of the engine 6 and the exhaust system 8th via sensors to detect in operation and store in a memory. In addition, the controller 4 as a component of the presented arrangement 10 trained, with the or at least one step of the method is performed.

Also shows 1 a driving route 12 , along the motor vehicle 2 currently driving. This route 12 is in several consecutive legs 14 . 16 . 18 . 20 . 22 divided.

In the method for performing a special mode, usually a special operation function, for the motor vehicle 2 becomes during a current and / or current drive of the motor vehicle 2 along the route 12 resulting driving profile analyzed and compared with at least one known driving profile. The special operating mode is carried out on further, future continuation of the journey, if the driving profile identified during the journey is suitable for carrying out the special operating mode.

In this case, the driving profile comprises a sequence of several temporally successive sub-profiles. A current driving profile is identified if a certain proportion of the sub-profiles is detected during the previous journey. In this case, the driving profile is a specific route 12 and / or a specific time schedule associated with subprofiles. An already known driving profile is then identified as the currently traveled driving profile if the driving route assigned to the driving profile is identified 12 and / or the sequence of partial profiles, by which the driving profile is composed, is recognized to a sufficient extent. As soon as the driving profile has been identified, it is checked whether a remainder of the driving profile to be mastered in future with regard to a course of operating parameters and the time for the planned execution of the special function is sufficient.

For this purpose, it is checked whether during the current ride at least a partial profile of the control unit 4 is recognized again. For this purpose, values of at least one operating parameter of the engine are accompanied during the journey 6 and / or the exhaust system 8th detected and compared with known values of the at least one operating parameter, wherein these known values of the at least one operating parameter characterize at least one partial profile and thus possibly a complete current and / or soon traveled driving profile.

In the basis of 1 described embodiment of the method is provided that the motor vehicle 2 starting from a starting point 24 , along the route 12 to an endpoint 26 moves. This currently used route 12 here's a sequence of five legs 14 . 16 . 18 . 20 . 22 has been used in the past at least once, taking for each leg 14 . 16 . 18 . 20 . 22 for each at least one previous trip, values of at least one operating parameter from the controller 4 have been recorded. Furthermore, here is a temporal, characteristic course of the value of the at least one operating parameter in a memory of the control unit 4 recorded and / or determined. In this case, each leg can 14 . 16 . 18 . 20 . 22 the temporal course of the values of the at least one operating parameter are assigned. When driving several times along the sections 14 . 16 . 18 . 20 . 22 the time course of the values is repeatedly recorded, whereby a statistical regularity, which can be represented by a curve for the characteristic curve, can be determined.

At the here in 1 illustrated driving situation has the motor vehicle 2 currently and / or currently already the first two successive legs 14 . 16 the route 12 kilometer. During the trip so far were from the control unit 4 Measured values of the at least one operating parameter and compared the course of the values of the at least one operating parameter with already known stored progressions of the at least one operating parameter. In this case, if the currently detected course of the values of the at least one currently detected operating parameter corresponds to a known course and / or coincides therewith in the context of statistical fluctuations, an already known course is identified. Furthermore, at least one of the two already traveled sections 14 . 16 identified and / or characterized by the detected history. If several, here two already covered sections 14 . 16 the entire route 12 are recognized, it is assumed in the course of the procedure that the further sections the further sections 18 . 20 . 22 be driven and thus the entire route 12 is driven. If at least one of the expected sections 18 . 20 . 22 for performing the special mode as a possible operating mode of the motor 6 and / or the exhaust system 8th is suitable, this can, if needed, now be carried out.

The in the current ride along the sections 14 . 16 detected course of the values of the at least one operating parameter, as already described, for the identification of at least one of the partial sections 14 . 16 compared with already known courses. In addition, the recorded values and the resulting course can be saved. Once the detected course recognized by comparison with known courses again and a known course and at least one of the sections 14 . 16 is or has been, is still possible, the already known course by the new course, for example. By supplementing time- and / or distance-dependent values and / or by statistical comparison of already recorded time- and / or distance-dependent values to To update.

Overall, a driving profile is defined based on a characteristic for a usually temporal course of the values of at least one operating parameter. In the present embodiment, the driving profile corresponds to the driving route 12 , The driving profile is subdivided into sub-profiles in a further embodiment, wherein a partial profile of the entire driving profile in turn with a partial route 14 . 16 . 18 . 20 . 22 the entire route 12 corresponds.

As a rule, the characteristic of the course of the values of the at least one operating parameter must be defined by at least one distinctive value of the at least one operating parameter. In addition, at least one partial profile and / or at least one partial route 14 . 16 . 18 . 20 . 22 , usually each sub-profile and / or each leg 14 . 16 . 18 . 20 . 22 , for at least one operating parameter of the motor vehicle 2 assigned a characteristic for the course of values.

In the context of the method, the at least one operating parameter for at least one component of the motor vehicle 12 and thus possibly the complete motor vehicle 12 recorded and / or monitored. In this case, at least one kinematic operating parameter, such as location or distance covered, engaged gear, steering angle, speed and / or acceleration of the motor vehicle 12 be considered while driving. In addition, possible operating parameters of components such as the engine 6 and / or the exhaust system 8th to take into account. This concerns, for example, a temperature or a pressure in the engine 6 , a lambda value of a mixture ratio of a mixture of air and fuel to be combusted and / or a temperature and a pressure of the exhaust gas of the exhaust system 8th ,

The driving profile and / or the route 12 For example, it may also be analyzed and / or identified on the basis of a date, a day of the week and / or a time at which the journey takes place. Thus, for example, a route 12 starting from a place of residence as a starting point 24 to work as a destination 26 and back regularly on weekdays at usual times driving the driving profile and / or the route 12 can also be assigned direction independent.

As a special mode, a diagnosis of at least one component of the motor vehicle 2 be performed.

Within the scope of the method, while driving, a prediction of a driving profile is or are based on at least one already identified partial profile of the driving profile and / or a prediction of a driving route 12 based on at least one traveled during the previous trip and already identified section 14 . 16 . 18 . 20 . 22 into the driving route 12 is divided, possible.

Claims (10)

Method for carrying out a special operating mode for a motor vehicle ( 2 ) during a journey of the motor vehicle ( 2 ), in which a driving profile resulting during the journey is analyzed and compared with at least one known driving profile, wherein the special mode is carried out if the driving profile identified during the journey is suitable for carrying out the special mode. The method of claim 1, wherein a driving profile includes a plurality of temporally successive sub-profiles, wherein a current driving profile is identified when a certain proportion of sub-profiles is detected while driving. The method of claim 1 or 2, wherein a driving profile is defined based on a characteristic for a course of a value of at least one operating parameter. The method of claim 3, wherein the characteristic is defined by at least one distinctive value of the at least one operating parameter. Method according to claim 3 or 4, wherein the characteristic is determined during at least one journey. Method according to one of claims 3 to 5, wherein the characteristic of the at least one operating parameter is compared during a trip with a known characteristic. Method according to one of the preceding claims, wherein the driving profile based on a traveled route ( 12 ) is detected in at least a part of the route ( 14 . 16 . 18 . 20 . 22 ) is divided. Method according to one of the preceding claims, in which a driving profile is analyzed and / or identified on the basis of a date, a day of the week and / or a time. Method according to one of the preceding claims, in which, as a special operating mode, a diagnosis of a component and / or a conditioning of a component of the motor vehicle ( 2 ) is or will be carried out. Arrangement for carrying out a special operating mode for a motor vehicle ( 2 ) during a journey of the motor vehicle ( 2 ), the arrangement ( 10 ) a control device ( 4 ), which is adapted to analyze a driving profile resulting during a journey and to compare it with at least one known driving profile, wherein the control device ( 4 ) is adapted to cause a performance of the special mode, if the identified during driving driving profile is suitable for performing the special mode.

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