DE102008025569A1 - Functional system e.g. particle filter, regulating and/or controlling method for diesel motor vehicle, involves regulating and/or controlling condition of functional system depending on mode of operation of combustion engine - Google Patents

Abstract

The method involves providing prognosis of a future mode of operation of an internal combustion engine (9) i.e. diesel engine, by considering telematics data e.g. route plan, of a diesel motor vehicle (1). A condition of a functional system e.g. particle filter (5), is foresighted whether to regulate or control the functional system by considering the prognosis of the combustion engine, where the condition is regulated or controlled depending on the mode of operation of the combustion engine. Actual target distance and barriers of the condition of the functional system are determined. An independent claim is also included for a controller for regulating and/or controlling a functional system of a motor vehicle.

Description

The The invention relates to a method for controlling and / or controlling as well a control of a functional system of a motor vehicle, respectively according to the preambles of the independent claims and a motor vehicle with such a controller.

The Functional system, for example, a particulate filter, a NOx storage catalyst, a diesel oxidation catalyst, a device for adapting a Lambda probe, a device for tank ventilation diagnosis, be an air conditioner or a thermal storage whose condition is in Dependence on a mode of operation of the internal combustion engine controlled and / or regulated.

Especially The invention relates to a process for the active regeneration of a in an exhaust system of a diesel vehicle downstream of a Internal combustion engine arranged particulate filter for cleaning a in the exhaust system guided exhaust gas flow, a controller for this as well as one equipped with the control Diesel motor vehicle.

to Cleaning of particles from an exhaust system or exhaust gas flow Diesel engine vehicles can use diesel particulate filters become. By diffusion and adhesion find in the diesel particulate filter a deposition of particles instead, the so-called particle loading. exceeds the load a certain amount, so can a regeneration of the filter, as a high load generates a back pressure in the exhaust system, the back pressure Performance and consumption of the diesel engine influenced. For regeneration of the diesel particulate filter, the load, so the deposited particles are burned. It is known, the regeneration active from a certain loading condition.

From the DE 199 57 715 A1 For example, it is known to regenerate a particulate filter when the amount of collected particulates has reached a predetermined upper limit. For this purpose, the loading state in various ways, eg. B. be determined indirectly by means of a measurement of the back pressure in the diesel particulate filter.

task The invention is an improved control and / or control to provide a functional system of a motor vehicle.

task In particular, the invention is an improved control and / or Control of a loading state, in particular by means of performing an active regeneration, a diesel particulate filter in vehicles to provide with diesel engine.

The Task is with the features of the independent claims solved.

• – Erstellen einer Prognose einer in der Zukunft liegenden Betriebsweise des Verbrennungsmotors,
• – Vorausschauendes Regeln und/oder Steuern eines Zustandes des Funktionssystems mittels Berücksichtigen der Prognose

mit einem Funktionssystem dessen Zustand in Abhängigkeit von einer Betriebsweise des Verbrennungsmotors gesteuert und/oder geregelt wird, wie beispielsweise einem Partikelfilter, NOx-Speicherkatalysator, Dieseloxidationskatalysator, einer Einrichtung zur Adaption einer Lambdasonde, einer Einrichtung zur Tankentlüftungsdiagnose, einer Klimaanlage oder einem Thermospeicher.The object is achieved with a method for regulating and / or controlling a functional system of a motor vehicle with an internal combustion engine with the following steps

• Preparing a prognosis of future operation of the internal combustion engine,
• Predictive control and / or control of a state of the functional system by taking into account the prognosis

with a functional system whose state is controlled and / or regulated as a function of an operating mode of the internal combustion engine, such as a particulate filter, NOx storage catalytic converter, diesel oxidation catalyst, a device for adapting a lambda probe, a device for tank ventilation diagnosis, an air conditioner or a thermal storage.

Different approaches can be used to create the forecast. The VDI reports No. 1975, 2006, pages 431 to 447 and 557 to 562 describe different strategies. The in the articles "Forecast as basis for the operating strategy in vehicles with alternative drives" (pages 431 to 447) . "Real-time Strategies for Predictive Optimal Energy Management in Hybrid Vehicles" (pages 557 to 560) such as "Telematics-based Energy Management for Hybrid Electric Vehicles in Urban Traffic" (pages 561 to 562) in so far as they relate to forecasts and / or strategies for their production by reference to the content of this application.

A Embodiment of the method has the following step on: Creating the forecast by means of telematics data of the motor vehicle.

Advantageous In many different systems, telematics data is generated for the purpose of Creating the forecast can be used. alternative However, it can also be telematics data, especially for Creating the forecast can be generated and / or retrieved. Both Telematics data may be data from driver assistance systems, a GPS navigation, from Internet-based systems, an adaptive Cruise control (ACC), a near field communication with the road infrastructure and / or other road users (car-to-car Communication), a traffic sign recognition or the like act. The telematics data can be advantageous in the future contain directional information, based on which the forecast is creatable.

Another embodiment of the method comprises the following step: Creating the prog nose by means of a route planning of the telematics data. Advantageously, when active use of the GPS navigation is a calculated route, which can be used to create the forecast. Depending on the accuracy of the planned route, speed limits may also be included to allow a particularly accurate forecast. For further refinement, the route planning may include traffic situation-related data (TMC), which may also be included in the forecast.

A Another embodiment of the method has the following Step on: Creating the forecast by means of geodata of the telematics data. The geodata can be the current as well as a variety of future ones Have whereabouts of the motor vehicle. In particular, you can the geodata a three-dimensional position along the route planning have, so that by means of height differences uphill and Downhill runs, ie performance phases and coasting phases can be determined and the prognosis are underlying.

A Another embodiment of the method has the following Step on: Determining a target distance of the telematics data and Blocking a regeneration of the particulate filter, if the actual target distance falls below a definable minimum distance. The target distance can be part of the telematics data and this be removable: it is however, also possible to otherwise target the distance determine.

The Task is further with a method for active regeneration one in an exhaust system of a diesel vehicle downstream an internal combustion engine arranged particulate filter for filtering solved in the exhaust system exhaust gas flow. The procedure includes the following steps: Creating a Forecast a future operation of the internal combustion engine and predictive control and / or control of a loading condition of the particulate filter by taking into account the prognosis. Vehicles with diesel particulate filters, mainly short-haul in city traffic, such as courier, Express and / or postal vehicles, but also taxis and shuttle vehicles or city buses can even at unfavorable Driving cycles sufficiently regenerate the particle filter. Advantageous can have negative influences on consumption and / or Performance minimized or failures of the entire system avoided become. By means of the forecast of the mode of operation, for example future speeds and / or torques of the May include for the internal combustion engine Regeneration favorable and / or necessary operating conditions found out or predicted and accordingly the active regeneration initiated to reduce the loading state become. Advantageously, without forecasts necessary crashes avoided by wrong timing initiated regeneration cycles or at least minimized. The active regeneration of the particle filter can by an additional injection or after Injection of fuel, for example, inside engine or in Exhaust line done. In addition, a downstream Oxidation catalyst can be provided. The exhaust gas temperature is thereby increases, with burning off of the deposited particles taking place, for example, by independent further burning as an exothermic reaction or fired to the end by means of the additionally injected Fuel. Advantageously, for example by means of the forecast driving cycles are recognized in which a particular rapid increase in load and / or reduced opportunities for active regeneration are expected, for example in the case of longer city trips. Can be beneficial for this Case any resulting opportunity used for regeneration even if, for example, to measure the loading condition detectable back pressure has not yet exceeded a critical level Has. In the event that the prognosis uncritical driving conditions, For example, longer highway trips, may the regeneration cycles to optimize fuel consumption at maximum intervals, with a comparatively larger charge may be acceptable. An optimization can according to the marginal values more consumption by counterpressure and fuel consumption during regeneration done.

Advantageous can be achieved by blocking the regeneration of the particulate filter avoid such at the end of the journey. Since it is in the regeneration is a combustion process of the loading of the particulate filter, This can cause a burning smell. For irritation and / or odor nuisance to avoid passengers when getting out of the vehicle, Advantageously, the regeneration can be avoided shortly before arrival at the destination become. It comes advantageous to no odor and / or Hazard due to possibly occurring exhaust gases.

A further embodiment of the method comprises the following step: advancing a regeneration planned after falling below the minimum distance to a greater distance than the minimum distance. The regulation of the loading state can advantageously be designed with foresight, wherein a date can be generated via a future planned regeneration. Advantageously, if this planned regeneration is very close to a predicted destination or end of a journey, a regeneration will be preferred, so that it is already completed at the actual end of the journey and this therefore at Ver let the diesel engine is no longer perceptible.

A Another embodiment of the method has the following Step on: Carrying out a route detection by means of in the operation of the diesel vehicle accumulating bus data, in particular Driving data. The bus data can be any, during operation of the diesel vehicle resulting data, in particular driving data, For example, generated by means of steering angle sensors, yaw rate sensors, Acceleration sensors, wheel sensors for brake, slip and / or vehicle dynamics control, accelerator pedal positions, etc. act. Advantageous can use this bus data, in particular driving data, a detection be done by already traversed routes, with the recognized route Advantageously, the prognosis is based. Advantageously, with high probability that the already traversed and recognized route again identical or at least only with low Deviations are passed through. Advantageously, it can be assumed be that often in everyday and commuter traffic routes to repeat. Particularly advantageous may be in courier and Bus rides are assumed.

A Another embodiment of the method has the following Step on: Creating the forecast using detected, storable and recognizable driving cycles of the route detection. at Such a recognized driving cycle may be, for example for a daily morning or evening ride too or act from a daily to be controlled place. Advantageously, the recognized driving cycle can be used as a basis for the prognosis become. Optionally, a time when creating the Prognosis are taken into account.

A Another embodiment of the method has the following Step up: Evaluate a steering angle of the driving data for creation the prognosis. Advantageously, by means of the steering angle, detectable over the distance traveled and / or Speed, curves and distinctive waypoints are determined the most easily recognizing a repetitive one Allow driving cycle.

A Another embodiment of the method has the following Step on: adaptation of control parameters for control and / or Control of the load condition by means of the forecast, and / or Adaptation of the control parameters by means of the telematics data and / or Adapting the control parameters by means of the bus data, in particular Driving data. Advantageously, the prognosis and / or the present Data evaluated and used to adjust the control parameters Be that one to the current mode of operation of the diesel engine adapted control of the load condition results. Advantageously can thereby the control of different operating conditions, for example caused by different drivers to be adapted.

It It is understood that in relation to a diesel vehicle and a loading state of a particulate filter illustrated steps of the method also suitably adapted to others, in particular the listed functional systems can be made.

The Task is also set up with a controller, designed and / or designed to perform an advance solved described method. It results in the advance described advantages.

The Task is further by a motor vehicle, in particular a diesel motor vehicle solved with a control described above. It revealed the advantages described above.

Further Advantages, features and details emerge from the following Description, in reference to the drawing, an embodiment is described in detail. Same, similar and / or functionally identical parts are provided with the same reference numerals. Show it:

1 a view of a control scheme for controlling a loading condition of a particulate filter; and

2 a schematic representation of a route between a starting point and a destination point with a marked minimum distance from the destination point.

1 shows a control scheme with a partially illustrated motor vehicle, in particular diesel motor vehicle 1 , for the regeneration of an exhaust system 3 of the diesel vehicle 1 arranged particulate filter 5 , The exhaust system 3 serves to guide an exhaust gas flow 7 an internal combustion engine 9 of the diesel vehicle 1 , For controlling the internal combustion engine 9 points the diesel vehicle 1 a motor control 11 on. The engine control 11 For example, a mixture formation of the internal combustion engine 9 Taxes. In addition, the engine control 11 for controlling an active regeneration of the particulate filter 5 designed by any method, for example by increasing the exhaust gas temperature. For this purpose, the engine control 11 an injection of fuel, not shown, for example, within the engine or in the exhaust stream 7 the exhaust system 3 drive. Furthermore, the exhaust system 3 further, not shown components for use in the regeneration, for example, an oxidation catalyst. The particle filter 5 has a non-illustrated loading of particles, in particular soot particles, by means of the engine control 11 controllable or active by means of afterburning for the regeneration of the particulate filter 5 is removable. For indirect measurement can be in the exhaust system 3 a pressure sensor 13 for measuring a pressure 15 be arranged. The pressure sensor 13 is upstream of the particulate filter 5 arranged. Together with data of the mixture formation of the engine control 11 can be from the measured pressure 15 a back pressure to be calculated, which is a measure of the loading of the particulate filter 5 represents. Alternatively or additionally, it is conceivable, the back pressure of the particulate filter 5 by means of upstream and downstream pressure sensors to determine. The pressure 15 or the resulting back pressure of the particle filter 5 can according to specifiable control parameters of the engine control 11 evaluated and accordingly an active regeneration of the particulate filter 5 be initiated. To a forward-looking regeneration or regulation of the loading of the particulate filter 5 to be able to make, is the engine control 11 a forecast unit 17 assigned. The forecast unit 17 and the engine control 11 form a regulator 19 for predictive or predictive control of the loading state of the particulate filter 5 , The regulator 19 can be a setpoint 21 the loading condition of the particulate filter 5 be supplied. The setpoint 21 can of characteristics and an operating condition of the internal combustion engine 9 of the diesel vehicle 1 depend.

The forecast unit 17 as part of the regulator 19 serves to create a forecast of future operation of the internal combustion engine 9 , for example, with respect to expected speeds and torques. The forecast unit 17 is a data bus 23 , which is indicated only by partial dotted lines assigned. The data bus can network a large number of components of the diesel vehicle with regard to data technology. In the present case are the particle filter 5 , the combustion engine 9 , the engine control 11 as well as the pressure sensor 13 also the data bus 23 assigned. Besides, the data bus 23 a navigation unit 25 , a steering angle sensor 27 as well as wheel sensors 29 assigned. The navigation unit 25 For example, route planning can be carried out by means of GPS navigation. The route planning of the navigation unit 25 may alternatively or additionally also be based on further telematics data, for example, internet-based and / or based on a near-field communication with the road infrastructure and / or other road users. The steering angle sensor 27 Can the current from a driver of the diesel engine 1 selected steering angle on the data bus 23 give. The wheel sensors 29 For example, measuring elements of an anti-lock braking system, a slip control or a slip angle control of the diesel engine 1 be.

By means of one of the navigation unit 25 Route planning can be carried out by the forecasting unit 17 a forecast of the future operation of the internal combustion engine 9 create. In particular, it is possible to detect certain driving conditions, for example city driving or expected traffic jam stops, in particular by means of the telematics data, and, accordingly, the active regeneration of the particulate filter 5 to control. ^

2 shows a schematically indicated route 30 between a starting point 31 and a destination point 33 , By means of in 1 represented forecast unit 17 or by means of the route planning of the navigation unit 25 It is possible to have an actual target distance from any point of residence of the diesel vehicle 1 on the route 30 to the destination point 33 to investigate. In 2 is by means of a double arrow and a circle around the target point 33 a minimum distance 35 symbolizes. Advantageously, by means of the regulator 19 under access to the data of the forecasting unit 17 a regeneration of the particulate filter 5 when falling below the actual distance of the diesel vehicle 1 below the minimum distance 35 be prevented. Advantageously, thereby a regeneration to the end of the drive of the diesel engine 1 be prevented, which is advantageous by not performing the regeneration otherwise occurring exhaust gases and / or odors when leaving and / or turning off the diesel engine 1 at least minimize or avoid altogether. Advantageously, it is also possible, an imminent or planned regeneration of the particulate filter 5 so that it is started, as long as the actual distance is still greater than the minimum distance 35 ,

Advantageously, provided that the driving route to be driven 30 is known, by means of the forecasting unit 17 a future operation of the internal combustion engine 9 be predicted, so that advantageous the regeneration of the diesel particulate filter 5 anticipatory, predictive. Advantageously, this information about the route to be traveled 30 as well as the expected performance requirements by means of the forecasting unit 17 generated when the motor vehicle 1 always on an identical or comparable route 30 is operated. This can be advantageous in the case of a city bus, always at identical Stops stops, be accepted. In addition, such information is available if the driver of the motor vehicle 1 the navigation unit 25 uses, taking the route 30 and the traffic situation (TMC) are predictable.

In both cases, the information about the driving route can be 30 to optimize the regeneration of the diesel particulate filter 5 used and thus consumption, power and emission of the internal combustion engine 9 be optimized.

Via a preset route of the navigation unit 25 It is known that, for example, a longer city trip will follow. In this case, the controller can 19 Regenerate as often as possible. In the case of a city bus, where the course or the route 30 As well as the associated load profile are known almost exactly, the regeneration can be planned consumption optimized.

In the event that a driver of the vehicle 1 often runs an identical route, for example, to work, but not the navigation unit 25 can be used advantageously by means of the forecasting unit 17 a route detection are performed. The forecast unit 17 can delivered to driving data, such as the steering angle sensor 27 and the wheel sensors 29 (Steering angle, speed profile, etc.) recognize and react accordingly. If the motor vehicle 1 is always moved in identical (bus traffic) or very similar (parcel delivery service) driving cycles, so the prediction can be done via a learning controller. This can be done in the forecasting unit 17 appropriate storage media may be provided in which, for example, the average soot load can be stored. In accordance with this average soot load, the load state can be regulated and / or controlled, or the regeneration can be initiated accordingly.

Advantageously, a reduction in consumption can be achieved, in particular since regeneration cycles no longer have to be stopped or at least significantly less frequently. Rather, they can be performed at an optimal time. Advantageously, the required detection technology or sensors in most cases anyway in the vehicle 1 present and / or easily over the data bus 23 available.

Geodata of the navigation unit can also be advantageous 25 , For example, position, height information, environment information of the forecasting unit 17 supplied, which processes this information and accordingly adapts or optimizes the control and / or control strategy.

The navigation unit 25 provides via the in-vehicle electronic communication system, the data bus 23 , For example, a CAN bus, gateway control unit, the distance information vehicle location to destination, from which the actual target distance is derivable. This actual target distance is calculated by conventional navigation units anyway, for example, the driver is shown in the display. The regulator responsible for the regeneration 19 can this distance information over the data bus 23 read in and based on the regeneration of the particulate filter 5 Taxes. For example, falls below the minimum distance 35 , which is for example 500 meters, avoided or blocked regeneration. Only in exceptional situations, this can be allowed, for example, if the load exceeds a no longer tolerable level. The regeneration preferably takes place outside the target circle. When approaching the target circle, ie when approaching the actual target distance to the minimum distance 35 the regeneration is preferred in case regeneration within the target circle is to be expected.

1

Diesel vehicle

3

exhaust system

5

particulate Filter

7

exhaust gas flow

9

internal combustion engine

11

motor control

13

pressure sensor

15

print

17

forecasting unit

19

regulator

21

setpoint

23

bus

25

navigation unit

27

Steering angle sensor

29

wheel sensors

30

driving route

31

starting point

33

Endpoint

35

minimum Distance

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19957715 A1 [0005]

Cited non-patent literature

• - "Forecast as basis for the operating strategy in vehicles with alternative drives" (pages 431 to 447) [0010]
• - "Real-Time Strategies for Predictive Optimal Energy Management in Hybrid Vehicles" (pages 557 to 560) [0010]
• - "Telematics-based Energy Management for Hybrid Electric Vehicles in Urban Traffic" (pages 561 to 562) [0010]

Claims (14)

Method for controlling and / or controlling a functional system of a motor vehicle with an internal combustion engine comprising the following steps: - generating a prognosis of a future operating mode of the internal combustion engine ( 9 ), - Predictive control and / or control of a state of the functional system by accounting for the prognosis with a functional system whose state is controlled and / or regulated in accordance with an operation of the internal combustion engine, such as a particulate filter, NOx storage catalyst, Dieseloxidationskatalysator, a device For adaptation of a lambda probe, a device for tank ventilation diagnosis, an air conditioner or a thermal storage. Method according to Claim 1, with the following step: - Generation of the prognosis by means of telematics data of the motor vehicle ( 1 ). A method according to the preceding claim, with the following Step: - Creating the forecast by means of route planning, preferably the telematics data. Method according to one of the preceding two claims, with the following step: - Creating the forecast by means of Geodata of the telematics data. Method according to one of the preceding claims, with the following step: determining an actual target distance and blocking a state of the functional system if the actual target distance has a definable minimum distance ( 35 ) falls below. A method according to the preceding claim, with the following Step: - Preferring one after falling below the Minimum distance planned state of the functional system to one greater distance than the minimum distance. Method according to one of the preceding claims, with the following step: - Carrying out a route detection means during operation of the motor vehicle ( 1 ) accumulating bus data ( 23 ), in particular driving data. A method according to the preceding claim, with the following Step: - Creating the forecast by means of recognized, storable and recognizable driving cycles of the route detection. Method according to one of the preceding two claims, with the following step: - Evaluation of a steering angle the driving data to create the forecast. Method according to one of the preceding claims, with at least one of the following steps: - Adapt of control parameters for controlling and / or controlling the functional state by means of the forecast, - Adapt the control parameters by means of the telematics data, - Adapt the control parameters by means of the driving data. Control ( 19 ), constructed, constructed and / or adapted to carry out a method according to any one of the preceding claims. Motor vehicle ( 1 ) with a controller ( 19 ) according to claim 11. Method for active regeneration of an exhaust system ( 3 ) of a diesel vehicle ( 1 ) downstream of an internal combustion engine ( 9 ) arranged particulate filter ( 5 ) for cleaning an exhaust system ( 3 ) guided exhaust gas flow ( 7 ), comprising the following steps: - generating a prognosis of future operation of the internal combustion engine ( 9 ), - Predictive control and / or control of a loading condition of the particulate filter ( 5 ) by considering the prognosis. A method according to claim 13, characterized by the following step: - determining an actual target distance and blocking regeneration of the particulate filter ( 5 ), if the actual target distance is a definable minimum distance ( 35 ) falls below.