WO2013013730A1 - Method for determining a driving range of a motor vehicle - Google Patents

Method for determining a driving range of a motor vehicle Download PDF

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Publication number
WO2013013730A1
WO2013013730A1 PCT/EP2012/001839 EP2012001839W WO2013013730A1 WO 2013013730 A1 WO2013013730 A1 WO 2013013730A1 EP 2012001839 W EP2012001839 W EP 2012001839W WO 2013013730 A1 WO2013013730 A1 WO 2013013730A1
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WO
WIPO (PCT)
Prior art keywords
motor vehicle
vehicle
transmitted
parameter value
range
Prior art date
Application number
PCT/EP2012/001839
Other languages
German (de)
French (fr)
Inventor
Andreas Lamprecht
Lars Wischhof
Stefan Grubwinkler
Original Assignee
Audi Ag
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Publication date
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Publication of WO2013013730A1 publication Critical patent/WO2013013730A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/3453—Special cost functions, i.e. other than distance or default speed limit of road segments
    • G01C21/3469—Fuel consumption; Energy use; Emission aspects
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/0112—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from the vehicle, e.g. floating car data [FCD]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0125—Traffic data processing
    • G08G1/0133—Traffic data processing for classifying traffic situation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
    • G08G1/0141—Measuring and analyzing of parameters relative to traffic conditions for specific applications for traffic information dissemination
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096741—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where the source of the transmitted information selects which information to transmit to each vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
    • G08G1/096805—Systems involving transmission of navigation instructions to the vehicle where the transmitted instructions are used to compute a route
    • G08G1/096827—Systems involving transmission of navigation instructions to the vehicle where the transmitted instructions are used to compute a route where the route is computed onboard
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
    • G08G1/096833—Systems involving transmission of navigation instructions to the vehicle where different aspects are considered when computing the route
    • G08G1/096838—Systems involving transmission of navigation instructions to the vehicle where different aspects are considered when computing the route where the user preferences are taken into account or the user selects one route out of a plurality

Definitions

  • the invention relates to a method for determining a driving range of a motor vehicle.
  • the quotient is formed from a quantity of residual energy in a resource store - that is to say a fuel tank, a battery or the like - and the average consumption of the motor vehicle per distance unit.
  • a resource store - that is to say a fuel tank, a battery or the like -
  • the average consumption of the motor vehicle per distance unit In order to obtain improved predictions regarding the remaining range, previously recorded data relating to a driving state of the motor vehicle, such as a more timely course of the energy consumption, can also be included in the calculation.
  • the present invention is therefore based on the object to provide a method of the type mentioned, which allows an improved determination of the driving range of a motor vehicle. This object is achieved by a method having the features of patent claim 1.
  • At least one vehicle-dependent parameter value is determined by means of a control device arranged in the motor vehicle and transmitted together with a geographical position of the motor vehicle to a calculating machine arranged outside the motor vehicle. Based on the transmitted data and at least one vehicle-independent parameter value, the latter determines the driving range and transmits it to a receiving device of the motor vehicle.
  • the range determination thus takes place on the computing machine located outside the motor vehicle.
  • the method according to the invention instead of transmitting a large number of environmental data between computing machine and motor vehicle, in the method according to the invention only the at least one vehicle-dependent parameter value with the geographical position on the one hand and the determined range on the other hand are transmitted wirelessly. This requires significantly less bandwidth, protects the transmission media used and can be reliably performed even under poor reception conditions.
  • the determination of the range in the external computing machine also has the advantage that a significantly higher computing capacity can be used than in the range determination by means of a control unit of the motor vehicle. This allows the use of more complex and accurate algorithms.
  • the maintenance of the programs and databases used is simplified and can be performed at any time, in contrast to the maintenance of vehicle-mounted control units.
  • the at least one vehicle-dependent parameter value characterizes a residual energy amount of an operating medium memory of the motor vehicle, an instantaneous consumption value of the motor vehicle, a time profile of a consumption value of the motor vehicle or the like. In general, this should also be understood to include all variables that characterize a state of the motor vehicle, which has an influence on its energy consumption. Other examples include tire pressure, the configuration of the motor vehicle, such as the presence of a roof rack or trailer, and the like.
  • the at least one vehicle-independent parameter value describes an environmental condition at the geographic location of the motor vehicle. This measures influencing factors that have a temporal impact on the consumption of the motor vehicle.
  • the at least one vehicle-independent parameter value characterizes an ambient condition at a point or section of a possible travel route emanating from the geographical position of the motor vehicle.
  • environmental conditions ie variables that do not depend on the motor vehicle itself, are included in the range calculation, which can influence the future consumption of the motor vehicle while driving along this route, so that a particularly accurate route-specific range prognosis is made possible.
  • the at least one vehicle-independent parameter value preferably characterizes a road condition, a road gradient, a traffic condition, an ambient temperature, a wind force, a wind direction or the like.
  • this includes all externally acting on the vehicle influencing factors that have an effect on the consumption of the motor vehicle.
  • factors are either constant, such as the topography along a possible route, or variable, such as the weather or the traffic situation characterizing sizes.
  • the advantage of determining the range in a computing machine separate from the motor vehicle is particularly strong, since corresponding data in the computing machine can be kept up to date at any time in a particularly simple manner.
  • the computing range determines the travel range with respect to all possible routes originating from the transmitted geographical position.
  • the driver thus has all the information he needs to plan his route. From the totality of the possible routes, for example, the most energy-efficient route to a predetermined destination can be determined.
  • a planned route is transmitted to the computing machine and the driving range is determined only with respect to the transmitted route.
  • the amount of data to be transmitted between motor vehicle and calculator data can be limited. The driver then only receives the information that is relevant for his already planned route and is not distracted by unnecessary information for him in this situation.
  • At least one vehicle-independent parameter value is determined by the control device and transmitted to the computing machine.
  • information about weather, road conditions or traffic situation can be collected and sent to the computing machine. These data are then available to the calculating machine for future range forecasts. Due to the constant updating of the dataset of the calculating machine, particularly good forecasts can be made.
  • the computing machine stores vehicle-independent and / or vehicle-dependent parameter values of a plurality of motor vehicles together with the respectively assigned geographical positions. This creates a particularly comprehensive database for future coverage forecasts and keeps it up to date. Furthermore, it is expedient to display the travel range received by the receiver on a display device of the motor vehicle, so that this information is not only taken into account in the automatic control of the motor vehicle, but also perceived by the driver and can be used in his journey planning.
  • the single FIGURE shows a schematic block diagram of the components and communication paths involved in carrying out a method according to the invention.
  • a motor vehicle 10 comprises a control unit 12, which communicates via a data bus 14 with a plurality of sensors 16, 18.
  • the sensors 16 acquire data characterizing an operating condition of the vehicle. These may be consumption values, a tank level, a state of charge of a battery, tire pressure, driving speed, information on the presence of attachments such as roof racks or the like, operating data of an engine or the like. With the sensors 18, however, environmental data, such as a geographic position of the motor vehicle 10, an outside air temperature, a road condition or the like are detected.
  • the data acquired by the sensors 16, 18 are stored in the control unit 12 either as instantaneous values or as a time profile. In order to make a prognosis regarding the remaining driving range of the motor vehicle 10, the acquired data is transmitted by means of a wireless transmission device 20 to a server 22. For example, known mobile radio standards for data transmission can be used for this purpose.
  • the server 22 has access to further information. These may be vehicle type specific consumables, information about actual consumption of the same motor vehicle 10 on the same route on a previous trip, or the like. Environmental information regarding the geographical position of the motor vehicle 10, such as weather or traffic situation, road condition, road gradient and the like can also be included in the determination of the driving range. Such data may be made available to the server via an internet connection 24 from respective databases 26.
  • the server 22 also communicates wirelessly with other motor vehicles 28. Is one of these motor vehicles 28 in the vicinity of the motor vehicle 10, for which a range calculation is to be carried out, or is driving a If the motor vehicle 28 has the same route as the motor vehicle 10, current consumption values or measured ambient conditions of the motor vehicle 28 can also be included in the determination of the range for the motor vehicle 10.
  • the vehicles 10 and 28 can also communicate with each other directly, ie bypassing the server 22, communicate with each other.
  • a particularly accurate and route-specific range estimation is possible if, in addition to the measured values of the sensors 16, 18, a planned route of the motor vehicle 10 is transmitted to the server 22 during the range request.
  • the planning of the route is made by the driver of the motor vehicle by means of a navigation device 30 in the motor vehicle 10.
  • This navigation device which has corresponding input and output devices, is also connected to the control unit 12 in connection.
  • the server 22 includes not only the environmental conditions at the current geographical position of the motor vehicle 10, but also the ambient conditions along the entire planned route in the determination of the driving range. This allows for a particularly accurate forecast, which also includes short-term events such as traffic jams, which can greatly affect the range of the motor vehicle. In order to detect such events particularly quickly and easily, it is expedient to store consumption data of motor vehicles 10, 28 for respective route sections on server 22. In this way an accurate historical picture of the average consumption for these sections of the route can be obtained. If one of the motor vehicles 28 now drives such a route section and transmits consumption values to the server 22 which deviate significantly from the historical average, this information can be included in the range calculation for the motor vehicle 10 before it travels the route section.
  • the determined range is finally sent wirelessly to the transmission device 20 of the motor vehicle, prepared by the control unit 12 and displayed on a display device of the navigation device 30.
  • the range of the motor vehicle 10 can also be determined for all possible routes emanating from the current geographical position of the motor vehicle 10. This allows the driver to make short-term and spontaneous changes to the route and still always have reliable information whether his desired destination is still in the range of the driving range of the motor vehicle 10.

Abstract

The invention relates to a method for determining a driving range of a motor vehicle (10), wherein by means of a control device (12) arranged in the motor vehicle (10) at least one vehicle-dependent parameter value is determined and transmitted, together with a geographical position of the motor vehicle (10), to a computer (22) arranged outside the motor vehicle (10). By means of the transmitted data and at least one vehicle-independent parameter value, said computer determines the driving range and transmits said value to a receiving unit (20) of the motor vehicle (10). Hereby, a particularly accurate prediction of the driving range of the motor vehicle (10) can be achieved while simultaneously transmitting a particularly small quantity of data between the motor vehicle (10) and the computer (22).

Description

Verfahren zum Bestimmen einer Fahrtreichweite eines Kraftwagens  Method for determining a driving range of a motor vehicle
BESCHREIBUNG: Die Erfindung betrifft ein Verfahren zum Bestimmen einer Fahrtreichweite eines Kraftwagens. DESCRIPTION The invention relates to a method for determining a driving range of a motor vehicle.
Um festzustellen, welche Reichweite ein Kraftwagen in einer gegebenen Situation besitzt, wird im einfachsten Fall der Quotient aus einer Restenergie- menge in einem Betriebsmittelspeicher - also einem Kraftstofftank, einer Batterie oder dgl. - und dem durchschnittlichen Verbrauch des Kraftwagens pro Streckeneinheit gebildet. Um verbesserte Vorhersagen bezüglich der Restreichweite zu erhalten, können zudem vorher aufgezeichnete Daten bezüglich eines Fahrzustands des Kraftwagens, wie beispielsweise ein zeitli- eher Verlauf des Energieverbrauchs, in die Berechnung mit einbezogen werden. In order to determine which range a motor vehicle has in a given situation, in the simplest case the quotient is formed from a quantity of residual energy in a resource store - that is to say a fuel tank, a battery or the like - and the average consumption of the motor vehicle per distance unit. In order to obtain improved predictions regarding the remaining range, previously recorded data relating to a driving state of the motor vehicle, such as a more timely course of the energy consumption, can also be included in the calculation.
Eine solche Bestimmung der Reichweite ist jedoch noch immer sehr ungenau, da zusätzlich zu den fahrzeugabhängigen Parametern auch fahrzeug- unabhängige Parameter, wie beispielsweise das Verkehrsaufkommen auf einer geplanten Route, die Reichweite des Kraftwagens beeinflussen. However, such determination of the range is still very inaccurate, since in addition to the vehicle-dependent parameters and vehicle-independent parameters, such as the traffic on a planned route, affect the range of the motor vehicle.
Aus der DE 10 2009 012 533 A1 ist es bekannt, über eine drahtlose Datenverbindung Informationen zwischen einem Kraftwagen und einem außerhalb des Kraftwagens angeordnetem Server auszutauschen. Der Server liefert auf eine Anfrage hin eine Vielzahl von fahrzeugunabhängigen Informationen bezüglich einer geplanten Route oder auch nur der geographischen Umgebung des Kraftwagens. Diese Informationen können im Kraftwagen angezeigt und weiterverarbeitet werden und untere anderem auch in die Reichweitenbe- Stimmung einbezogen werden. From DE 10 2009 012 533 A1 it is known to exchange information between a motor vehicle and a server arranged outside the motor vehicle via a wireless data connection. The server delivers on request, a variety of vehicle-independent information regarding a planned route or even the geographical environment of the motor vehicle. This information can be displayed and processed in the car and, among other things, also be included in the range perception.
Nachteilig ist hierbei jedoch, dass hierfür eine große Datenmenge vom Server an den Kraftwagen übertragen werden muss. Dies belastet die hierfür üblicherweise verwendeten, relativ schmalbandigen Mobilfunkverbindungen stark. In Gebieten mit eingeschränktem Mobilfunkempfang sinkt zudem die Bandbreite, die für die Datenübertragung zur Verfügung steht, so dass die angeforderten Umgebungsdaten gegebenenfalls nicht übertragen werden können. The disadvantage here, however, that for this a large amount of data must be transmitted from the server to the car. This puts a strain on the relatively narrowband mobile connections that are commonly used for this purpose strong. In areas with limited mobile reception, the bandwidth that is available for data transmission also decreases, so that the requested environment data may not be transmitted.
Der vorliegenden Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art bereitzustellen, welches eine verbesserte Bestimmung der Fahrtreichweite eines Kraftwagens ermöglicht. Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst. The present invention is therefore based on the object to provide a method of the type mentioned, which allows an improved determination of the driving range of a motor vehicle. This object is achieved by a method having the features of patent claim 1.
Bei einem erfindungsgemäßen Verfahren zum Bestimmen einer Fahrtreichweite eines Kraftwagens, wird mittels einer im Kraftwagen angeordneten Steuereinrichtung zumindest ein fahrzeugabhängiger Parameterwert bestimmt und zusammen mit einer geographischen Position des Kraftwagens an eine außerhalb des Kraftwagens angeordnete Rechenmaschine übermittelt. Diese bestimmt anhand der übermittelten Daten sowie wenigstens eines fahrzeugunabhängigen Parameterwerts die Fahrtreichweite und übermittelt diese an ein Empfangsgerät des Kraftwagens. In a method according to the invention for determining a driving range of a motor vehicle, at least one vehicle-dependent parameter value is determined by means of a control device arranged in the motor vehicle and transmitted together with a geographical position of the motor vehicle to a calculating machine arranged outside the motor vehicle. Based on the transmitted data and at least one vehicle-independent parameter value, the latter determines the driving range and transmits it to a receiving device of the motor vehicle.
Im Gegensatz zum Stand der Technik findet die Reichweitenbestimmung also auf der außerhalb des Kraftwagens angeordneten Rechenmaschine statt. Anstelle eine Vielzahl von Umgebungsdaten zwischen Rechenmaschi- ne und Kraftwagen zu übertragen, werden bei dem erfindungsgemäßen Verfahren lediglich der wenigstens eine fahrzeugabhängige Parameterwert mit der geographischen Position einerseits sowie die ermittelte Reichweite andererseits drahtlos übermittelt. Dies benötigt deutlich weniger Bandbreite, schont die verwendeten Übermittlungsmedien und kann auch unter schlech- ten Empfangsbedingungen zuverlässig durchgeführt werden. In contrast to the prior art, the range determination thus takes place on the computing machine located outside the motor vehicle. Instead of transmitting a large number of environmental data between computing machine and motor vehicle, in the method according to the invention only the at least one vehicle-dependent parameter value with the geographical position on the one hand and the determined range on the other hand are transmitted wirelessly. This requires significantly less bandwidth, protects the transmission media used and can be reliably performed even under poor reception conditions.
Die Bestimmung der Reichweite in der externen Rechenmaschine hat zudem den Vorteil, dass eine deutlich höhere Rechenkapazität genutzt werden kann als bei der Reichweitenbestimmung mittels eines Steuergeräts des Kraftwa- gens. Dies ermöglicht die Verwendung komplexerer und genauerer Algorithmen. Auch die Wartung der verwendeten Programme und Datenbanken wird vereinfacht und kann im Gegensatz zur Wartung fahrzeuggebundener Steuergeräte jederzeit durchgeführt werden. In einer bevorzugten Ausführungsform der Erfindung charakterisiert der zumindest eine fahrzeugabhängige Parameterwert eine Restenergiemenge eines Betriebsmittelspeichers des Kraftwagens, einen momentaner Verbrauchswert des Kraftwagens, einen zeitlicher Verlauf eines Verbrauchs- werts des Kraftwagens oder dergleichen. Allgemein sollen hierunter ferner alle Größen verstanden werden, die einen Zustand des Kraftwagens charakterisieren, welcher einen Einfluss auf dessen Energieverbrauch hat. Weitere Beispiele hierfür sind der Reifendruck, die Konfiguration des Kraftwagens, wie beispielsweise das Vorhandensein eines Dachgepäckträgers oder An- hängers, und Ähnliches. The determination of the range in the external computing machine also has the advantage that a significantly higher computing capacity can be used than in the range determination by means of a control unit of the motor vehicle. This allows the use of more complex and accurate algorithms. The maintenance of the programs and databases used is simplified and can be performed at any time, in contrast to the maintenance of vehicle-mounted control units. In a preferred embodiment of the invention, the at least one vehicle-dependent parameter value characterizes a residual energy amount of an operating medium memory of the motor vehicle, an instantaneous consumption value of the motor vehicle, a time profile of a consumption value of the motor vehicle or the like. In general, this should also be understood to include all variables that characterize a state of the motor vehicle, which has an influence on its energy consumption. Other examples include tire pressure, the configuration of the motor vehicle, such as the presence of a roof rack or trailer, and the like.
Vorzugsweise beschreibt der wenigstens eine fahrzeugunabhängige Parameterwert eine Umgebungsbedingung an der geographischen Position des Kraftwagens. Damit werden Einflussgrößen erfasst, die einen zeitlich nahen Einfluss auf den Verbrauch des Kraftwagens haben. Preferably, the at least one vehicle-independent parameter value describes an environmental condition at the geographic location of the motor vehicle. This measures influencing factors that have a temporal impact on the consumption of the motor vehicle.
Es ist ferner zweckmäßig, wenn der wenigstens eine fahrzeugunabhängige Parameterwert eine Umgebungsbedingung an einem Punkt oder Abschnitt einer von der geographischen Position des Kraftwagens ausgehenden mög- liehen Fahrtroute charakterisiert. Hierdurch werden Umgebungsbedingungen, also Größen, die nicht vom Kraftwagen selbst abhängen, in die Reichweitenberechnung einbezogen, die den zukünftigen Verbrauch des Kraftwagens bei dessen Fahrt entlang dieser Fahrtroute beeinflussen können, so dass eine besonders genaue routenspezifische Reichweitenprognose er- möglicht wird. It is also expedient if the at least one vehicle-independent parameter value characterizes an ambient condition at a point or section of a possible travel route emanating from the geographical position of the motor vehicle. As a result, environmental conditions, ie variables that do not depend on the motor vehicle itself, are included in the range calculation, which can influence the future consumption of the motor vehicle while driving along this route, so that a particularly accurate route-specific range prognosis is made possible.
Vorzugsweise charakterisiert der wenigstens eine fahrzeugunabhängige Parameterwert einen Straßenzustand, eine Fahrbahnsteigung, einen Verkehrszustand, eine Umgebungstemperatur, eine Windstärke, eine Windrichtung oder dergleichen. Allgemein fallen hierunter alle von außen auf das Fahrzeug einwirkende Einflussgrößen, die eine Auswirkung auf den Verbrauch des Kraftwagens haben. Solche Einflussgrößen sind entweder konstant, wie beispielsweise die Topographie entlang einer möglichen Fahrtroute, oder aber variabel, wie beispielsweise das Wetter oder die Verkehrslage kennzeich- nende Größen. Gerade bei der zeitnahen Erfassung solcher variabler Ein- flussgrößen kommt der Vorteil der Reichweitenbestimmung in einer vom Kraftwagen getrennten Rechenmaschine besonders stark zu tragen, da entsprechende Daten in der Rechenmaschine besonders einfach jederzeit auf dem aktuellen Stand gehalten werden können. In einer bevorzugten Ausführungsform der Erfindung wird durch die Rechenmaschine die Fahrtreichweite bezüglich aller möglichen von der übermittelten geographischen Position ausgehenden Fahrtrouten ermittelt. Dem Fahrer stehen somit alle Informationen zur Verfügung, die er benötigt, um seine Fahrtroute zu planen. Aus der Gesamtheit der möglichen Routen kann beispielsweise auch die energiesparendste Route zu einem vorgegebenen Ziel bestimmt werden. Alternativ hierzu ist es auch möglich, dass von der Steuereinrichtung des Kraftwagens eine geplante Fahrtroute an die Rechenmaschine übermittelt wird und die Fahrtreichweite lediglich bezüglich der übermittelten Fahrtroute ermittelt wird. Damit kann die Menge der zwischen Kraftwagen und Rechenmaschine zu übermittelnden Daten eingeschränkt werden. Der Fahrer erhält dann lediglich die Informationen, die für seine bereits fest geplante Route relevant sind und wird nicht durch für ihn in dieser Situation unnötige Informationen abgelenkt. The at least one vehicle-independent parameter value preferably characterizes a road condition, a road gradient, a traffic condition, an ambient temperature, a wind force, a wind direction or the like. In general, this includes all externally acting on the vehicle influencing factors that have an effect on the consumption of the motor vehicle. Such factors are either constant, such as the topography along a possible route, or variable, such as the weather or the traffic situation characterizing sizes. Especially with the timely detection of such variable influencing variables, the advantage of determining the range in a computing machine separate from the motor vehicle is particularly strong, since corresponding data in the computing machine can be kept up to date at any time in a particularly simple manner. In a preferred embodiment of the invention, the computing range determines the travel range with respect to all possible routes originating from the transmitted geographical position. The driver thus has all the information he needs to plan his route. From the totality of the possible routes, for example, the most energy-efficient route to a predetermined destination can be determined. Alternatively, it is also possible that the driver of the motor vehicle, a planned route is transmitted to the computing machine and the driving range is determined only with respect to the transmitted route. Thus, the amount of data to be transmitted between motor vehicle and calculator data can be limited. The driver then only receives the information that is relevant for his already planned route and is not distracted by unnecessary information for him in this situation.
In einer weiteren bevorzugten Ausführungsform wird von der Steuereinrich- tung zumindest ein fahrzeugunabhängiger Parameterwert bestimmt und an die Rechenmaschine übermittelt. So können beispielsweise mittels geeigneter Sensoren Informationen zu Wetter, Straßenzustand oder Verkehrslage gesammelt und an die Rechenmaschine gesendet werden. Diese Daten stehen der Rechenmaschine dann für zukünftige Reichweitenprognosen zur Verfügung. Durch die ständige Aktualisierung des Datenbestandes der Rechenmaschine können so besonders gute Vorhersagen getroffen werden. In a further preferred embodiment, at least one vehicle-independent parameter value is determined by the control device and transmitted to the computing machine. Thus, for example, by means of suitable sensors, information about weather, road conditions or traffic situation can be collected and sent to the computing machine. These data are then available to the calculating machine for future range forecasts. Due to the constant updating of the dataset of the calculating machine, particularly good forecasts can be made.
Besonders zweckmäßig ist es, wenn die Rechenmaschine fahrzeugunabhängige und/oder fahrzeugabhängige Parameterwerte einer Mehrzahl von Kraftfahrzeugen zusammen mit den jeweils zugeordneten geographischen Positionen speichert. Damit wird eine besonders umfassende Datenbasis für zukünftige Reichweitenprognosen geschaffen und ständig auf dem neuesten Stand gehalten. Ferner ist es zweckmäßig, die von dem Empfangsgerät empfangene Fahrtreichweite auf einem Anzeigegerät des Kraftwagens anzuzeigen, so dass diese Informationen nicht nur in der automatischen Steuerung des Kraftwagens berücksichtigt, sondern auch vom Fahrer wahrgenommen und bei seiner Fahrtplanung verwendet werden können. Im Folgenden werden die Erfindung und ihre Ausführungsformen anhand der Zeichnung näher erläutert. Die einzige Figur zeigt dabei ein schematisches Blockdiagramm der an der Durchführung eines erfindungsgemäßen Verfah- rens beteiligten Komponenten und Kommunikationswege. It is particularly expedient if the computing machine stores vehicle-independent and / or vehicle-dependent parameter values of a plurality of motor vehicles together with the respectively assigned geographical positions. This creates a particularly comprehensive database for future coverage forecasts and keeps it up to date. Furthermore, it is expedient to display the travel range received by the receiver on a display device of the motor vehicle, so that this information is not only taken into account in the automatic control of the motor vehicle, but also perceived by the driver and can be used in his journey planning. In the following the invention and its embodiments will be explained in more detail with reference to the drawing. The single FIGURE shows a schematic block diagram of the components and communication paths involved in carrying out a method according to the invention.
Ein Kraftwagen 10 umfasst ein Steuergerät 12, welches über einen Datenbus 14 mit einer Mehrzahl von Sensoren 16, 18 kommuniziert. Die Sensoren 16 erfassen Daten, die einen Betriebszustand des Fahrzeugs charakterisieren. Hierbei kann es sich um Verbrauchswerte, einen Tankfüllstand, einen Ladezustand einer Batterie, Reifendruck, Fahrtgeschwindigkeit, Informationen zum Vorhandensein von Anbauteilen wie Dachgepäckträgern oder dergleichen, Betriebsdaten eines Motors oder ähnliches handeln. Mit den Sensoren 18 werden hingegen Umgebungsdaten, wie beispielsweise eine geographi- sehe Position des Kraftwagens 10, eine Außenlufttemperatur, ein Straßenzustand oder dgl. erfasst. Die von den Sensoren 16, 18 erfassten Daten werden im Steuergerät 12 entweder als Momentanwerte oder aber als zeitlicher Verlauf gespeichert. Um eine Prognose bezüglich der verbleibenden Fahrtreichweite des Kraftwagens 10 zu erstellen, werden die erfassten Daten mittels einer drahtlosen Übermittlungseinrichtung 20 an einen Server 22 übermittelt. Hierzu können beispielsweise bekannte Mobilfunkstandards zur Datenübertragung Anwendung finden. A motor vehicle 10 comprises a control unit 12, which communicates via a data bus 14 with a plurality of sensors 16, 18. The sensors 16 acquire data characterizing an operating condition of the vehicle. These may be consumption values, a tank level, a state of charge of a battery, tire pressure, driving speed, information on the presence of attachments such as roof racks or the like, operating data of an engine or the like. With the sensors 18, however, environmental data, such as a geographic position of the motor vehicle 10, an outside air temperature, a road condition or the like are detected. The data acquired by the sensors 16, 18 are stored in the control unit 12 either as instantaneous values or as a time profile. In order to make a prognosis regarding the remaining driving range of the motor vehicle 10, the acquired data is transmitted by means of a wireless transmission device 20 to a server 22. For example, known mobile radio standards for data transmission can be used for this purpose.
Neben den vom Kraftwagen 10 bei einer Reichweitenanfrage übermittelten Daten stehen dem Server 22 weitere Informationen zur Verfügung. Hierbei kann es sich um fahrzeugtypspezifische Verbrauchsmittelwerte, Informationen über einen tatsächlichen Verbrauch des selben Kraftwagens 10 auf der gleichen Strecke bei einer früheren Fahrt oder dgl. handeln. Auch Umgebungsinformationen bezüglich der geographischen Position des Kraftwagens 10, wie beispielsweise Wetter- oder Verkehrslage, Straßenzustand, Fahrbahnsteigung und dergleichen können in die Bestimmung der Fahrtreichweite mit einfließen. Solche Daten können dem Server über eine Internetverbin- dung 24 von jeweiligen Datenbanken 26 zur Verfügung gestellt werden. In addition to the data transmitted by the motor vehicle 10 in the event of a reach request, the server 22 has access to further information. These may be vehicle type specific consumables, information about actual consumption of the same motor vehicle 10 on the same route on a previous trip, or the like. Environmental information regarding the geographical position of the motor vehicle 10, such as weather or traffic situation, road condition, road gradient and the like can also be included in the determination of the driving range. Such data may be made available to the server via an internet connection 24 from respective databases 26.
Der Server 22 kommuniziert ferner drahtlos mit weiteren Kraftwagen 28. Befindet sich einer dieser Kraftwagen 28 in der Nähe des Kraftwagens 10, für den eine Reichweitenberechnung durchgeführt werden soll, oder befährt ei- ner der Kraftwagen 28 die gleiche Route wie der Kraftwagen 10, so können auch aktuelle Verbrauchswerte oder gemessene Umgebungsbedingungen des Kraftwagens 28 in die Bestimmung der Reichweite für den Kraftwagen 10 mit einbezogen werden. Die Kraftwagen 10 und 28 können zudem zum Informationsaustausch auch untereinander direkt, also unter Umgehung des Servers 22, kommunizieren. The server 22 also communicates wirelessly with other motor vehicles 28. Is one of these motor vehicles 28 in the vicinity of the motor vehicle 10, for which a range calculation is to be carried out, or is driving a If the motor vehicle 28 has the same route as the motor vehicle 10, current consumption values or measured ambient conditions of the motor vehicle 28 can also be included in the determination of the range for the motor vehicle 10. The vehicles 10 and 28 can also communicate with each other directly, ie bypassing the server 22, communicate with each other.
Eine besonders genaue und routenspezifische Reichweitenabschätzung ist möglich, wenn zusätzlich zu den Messwerten der Sensoren 16, 18 bei der Reichweitenanfrage eine geplante Fahrtroute des Kraftwagens 10 mit an den Server 22 übermittelt wird. Die Planung der Fahrtroute wird vom Fahrer des Kraftwagens mittels eines Navigationsgeräts 30 im Kraftwagen 10 vorgenommen. Dieses Navigationsgerät, welches über entsprechende Ein- und Ausgabevorrichtungen verfügt, steht ebenfalls mit dem Steuergerät 12 in Verbindung. A particularly accurate and route-specific range estimation is possible if, in addition to the measured values of the sensors 16, 18, a planned route of the motor vehicle 10 is transmitted to the server 22 during the range request. The planning of the route is made by the driver of the motor vehicle by means of a navigation device 30 in the motor vehicle 10. This navigation device, which has corresponding input and output devices, is also connected to the control unit 12 in connection.
Bei einer solchen routenspezifischen Reichweitenabschätzung werden vom Server 22 nicht nur die Umgebungsbedingungen an der momentanen geographischen Position des Kraftwagens 10, sonder auch die Umgebungsbe- dingungen entlang der gesamten geplanten Route in die Bestimmung der Fahrtreichweite einbezogen. Dies ermöglicht eine besonders genaue Prognose, die auch kurzfristig auftretende Ereignisse wie Staus, die die Reichweite des Kraftwagens stark beeinflussen können, mit einbezieht. Um solche Ereignisse besonders schnell und einfach erfassen zu können, ist es zweckmäßig, Verbrauchsdaten der Kraftwagen 10, 28 für jeweilige Routenabschnitte auf dem Server 22 zu speichern. Auf diese Weise kann eine genaues historisches Bild des durchschnittlichen Verbrauchs für diese Routenabschnitte gewonnen werden. Befährt nun einer der Kraftwagen 28 einen solchen Routenabschnitt und überträgt dabei Verbrauchswerte an den Server 22, die deutlich vom historischen Durchschnitt abweichen, so kann diese Information in die Reichweitenberechnung für den Kraftwagen 10 mit einbezogen werden, bevor dieser den Routenabschnitt befährt. Die ermittelte Reichweite wird schließlich drahtlos an das Übermittlungsgerät 20 des Kraftwagens gesendet, von dem Steuergerät 12 aufbereitet und auf einer Anzeigevorrichtung des Navigationsgeräts 30 angezeigt. Alternativ zur Bestimmung der Reichweite für eine einzige Route kann die Reichweite des Kraftwagens 10 auch für allle möglichen, von der momentanen geographischen Position des Kraftwagens 10 ausgehenden Routen bestimmt wird. Dies ermöglicht es dem Fahrer, kurzfristig und spontan Routen- änderungen vorzunehmen und dennoch stets zuverlässige Informationen zu besitzen, ob sein angestrebtes Fahrtziel noch im Bereich der Fahrtreichweite des Kraftwagens 10 liegt. In such a route-specific range estimation, the server 22 includes not only the environmental conditions at the current geographical position of the motor vehicle 10, but also the ambient conditions along the entire planned route in the determination of the driving range. This allows for a particularly accurate forecast, which also includes short-term events such as traffic jams, which can greatly affect the range of the motor vehicle. In order to detect such events particularly quickly and easily, it is expedient to store consumption data of motor vehicles 10, 28 for respective route sections on server 22. In this way an accurate historical picture of the average consumption for these sections of the route can be obtained. If one of the motor vehicles 28 now drives such a route section and transmits consumption values to the server 22 which deviate significantly from the historical average, this information can be included in the range calculation for the motor vehicle 10 before it travels the route section. The determined range is finally sent wirelessly to the transmission device 20 of the motor vehicle, prepared by the control unit 12 and displayed on a display device of the navigation device 30. As an alternative to determining the range for a single route, the range of the motor vehicle 10 can also be determined for all possible routes emanating from the current geographical position of the motor vehicle 10. This allows the driver to make short-term and spontaneous changes to the route and still always have reliable information whether his desired destination is still in the range of the driving range of the motor vehicle 10.

Claims

PATENTANSPRÜCHE: CLAIMS:
Verfahren zum Bestimmen einer Fahrtreichweite eines Kraftwagens (10), bei welchem mittels einer im Kraftwagen (10) angeordneten Steuereinrichtung (12) zumindest ein fahrzeugabhängiger Parameterwert bestimmt und zusammen mit einer geographischen Position des Kraftwagens (10) an eine außerhalb des Kraftwagens (10) angeordnete Rechenmaschine (22) übermittelt wird, welche anhand der übermittelten Daten sowie wenigstens eines fahrzeugunabhängigen Parameterwerts die Fahrtreichweite bestimmt und an ein Empfangsgerät (20) des Kraftwagens (10) übermittelt. Method for determining a driving range of a motor vehicle (10), in which at least one vehicle-dependent parameter value is determined by means of a control device (12) arranged in the motor vehicle (10) and arranged together with a geographical position of the motor vehicle (10) to an outside of the motor vehicle (10) Calculating machine (22) is transmitted, which determines based on the transmitted data and at least one vehicle-independent parameter value, the driving range and transmitted to a receiving device (20) of the motor vehicle (10).
Verfahren nach Anspruch 1 , Method according to claim 1,
dadurch gekennzeichnet, dass characterized in that
der zumindest eine fahrzeugabhängige Parameterwert eine Restenergiemenge eines Betriebsmittelspeichers des Kraftwagens (10), einen momentanen Verbrauchswert des Kraftwagens (10), einen zeitlichen Verlauf eines Verbrauchswerts des Kraftwagens ( 0) oder dgl. charakterisiert. the at least one vehicle-dependent parameter value characterizes a residual energy amount of a resource memory of the motor vehicle (10), a current fuel consumption value of the motor vehicle (10), a time profile of a consumption value of the motor vehicle (0) or the like.
Verfahren nach Anspruch 1 oder 2, Method according to claim 1 or 2,
dadurch gekennzeichnet, dass characterized in that
der wenigstens eine fahrzeugunabhängige Parameterwert eine Umgebungsbedingung an der geographischen Position des Kraftwagens (10) charakterisiert. the at least one vehicle-independent parameter value characterizes an environmental condition at the geographical position of the motor vehicle (10).
Verfahren nach einem der Ansprüche 1 bis 3, Method according to one of claims 1 to 3,
dadurch gekennzeichnet, dass characterized in that
der wenigstens eine fahrzeugunabhängige Parameterwert eine Umgebungsbedingung an einem Punkt oder Abschnitt einer von der geographischen Position des Kraftwagens (10) ausgehenden möglichen Fahrtroute charakterisiert. the at least one vehicle-independent parameter value characterizes an environmental condition at a point or portion of a possible travel route emanating from the geographical position of the motor vehicle (10).
Verfahren nach Anspruch 3 oder 4, Method according to claim 3 or 4,
dadurch gekennzeichnet, dass characterized in that
der wenigstens eine fahrzeugunabhängige Parameterwert einen Straßenzustand, eine Fahrbahnsteigung, einen Verkehrszustand, eine Umgebungstemperatur, eine Windstärke, eine Windrichtung oder dgl. charakterisiert. Verfahren nach einem der Ansprüche 1 bis 5, the at least one vehicle-independent parameter value characterizes a road condition, a road gradient, a traffic condition, an ambient temperature, a wind force, a wind direction or the like. Method according to one of claims 1 to 5,
dadurch gekennzeichnet, dass characterized in that
durch die Rechenmaschine (22) die Fahrtreichweite bezüglich aller möglichen von der übermittelten geographischen Position ausgehenden Fahrtrouten ermittelt wird. the computing range (22) determines the travel range with respect to all possible routes originating from the transmitted geographical position.
Verfahren nach einem der Ansprüche 1 bis 5, Method according to one of claims 1 to 5,
dadurch gekennzeichnet, dass characterized in that
von der Steuereinrichtung (12) des Kraftwagens (10) eine geplante Fahrtroute an die Rechenmaschine (22) übermittelt wird und die Fahrtreichweite lediglich bezüglich der übermittelten Fahrtroute ermittelt wird. from the control device (12) of the motor vehicle (10) a planned route to the computing machine (22) is transmitted and the driving range is determined only with respect to the transmitted route.
Verfahren nach einem der Ansprüche 1 bis 7, Method according to one of claims 1 to 7,
dadurch gekennzeichnet, dass characterized in that
von der Steuereinrichtung (12) zumindest ein fahrzeugunabhängiger Parameterwert bestimmt und an die Rechenmaschine (22) übermittelt wird. at least one vehicle-independent parameter value is determined by the control device (12) and transmitted to the calculating machine (22).
Verfahren nach Anspruch 8, Method according to claim 8,
dadurch gekennzeichnet, dass characterized in that
die Rechenmaschine (22) fahrzeugunabhängige und/oder fahrzeugabhängige Parameterwerte einer Mehrzahl von Kraftfahrzeugen (10, 28) zusammen mit den jeweils zugeordneten geographischen Positionen speichert. the calculating machine (22) stores vehicle-independent and / or vehicle-dependent parameter values of a plurality of motor vehicles (10, 28) together with the respectively assigned geographical positions.
Verfahren nach einem der Ansprüche 1 bis 9, Method according to one of claims 1 to 9,
dadurch gekennzeichnet, dass characterized in that
die Rechenmaschine (22) fahrzeugunabhängige Parameterwerte mit jeweils zugeordneten geographischen Positionen von zumindest einer weiteren Rechenmaschine (26) empfängt und speichert. the calculating machine (22) receives and stores vehicle-independent parameter values, each with assigned geographical positions, of at least one further calculating machine (26).
Verfahren nach einem der Ansprüche 1 bis 10, Method according to one of claims 1 to 10,
dadurch gekennzeichnet, dass characterized in that
die von dem Empfangsgerät (20) empfangene Fahrtreichweite auf einem Anzeigegerät (30) des Kraftwagens (10) angezeigt wird.
Figure imgf000012_0001
the travel range received by the receiving device (20) is displayed on a display device (30) of the motor vehicle (10).
Figure imgf000012_0001
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