DE102012201156B4 - Method, data processing device and computer program for providing speed warning information for a navigation device - Google Patents

Abstract

Method (700) for providing speed warning information (160) for a navigation device (110), the method (700) having the following steps:- Reading in (710) at least one first piece of speed limit information (138a) with regard to a selected route (320, S1 , S2), the first speed limit information item (138a) being read from a first data transmission channel into a data linking unit (120) of the navigation device (110), and at least one second speed limit information item (138b) relating to the selected route (320, S1, S2) being read in from a second data transmission channel into the data link unit (120) of the navigation device (110), the first data transmission channel being physically independent of the second data transmission channel; and - linking (720) the first speed limit information (138a) with the second speed limit information (138b) in order to obtain the speed warning information (160) for the route (320, S1, S2) in the step of reading (710) at least one of the at least first ( 138a) and/or second (138b) speed limit information is read in, which represents a way from which data transmission channel and/or on which the relevant speed limit information (138a, 138b, 138c) was determined and/or verified, wherein in the speed warning information (160) contains the attribute (A) of the at least one piece of speed limit information (138a, 138b, 138c), and characterized in that the attribute of that speed limit information which is output as speed limit information with the highest priority as speed warning information also for an output is used to indicate to the driver the source of the speed limit.

Description

State of the art

The present invention relates to a method for providing speed warning information for a navigation device, to a corresponding data processing device and to a corresponding computer program.

To increase driver comfort, a speed limit for a vehicle on a road currently being traveled by the vehicle is often displayed in navigation devices. This speed limit is read, for example, from a separate file on a digital road map or added as an attribute from the road segment and read by the navigation device and displayed to a driver of the vehicle. In this way, the driver receives an indication of which speed limit is currently in force. However, such speed information is subject to obsolescence, so that in some cases the driver is signaled that the maximum speed for the road segment he is currently driving on with the vehicle is too low or too high. This can lead to the driver exceeding the maximum permissible speed, which can result in unwanted additional costs for the journey in the form of a fine.

The pamphlet DE 10 2008 023 972 A1 discloses a method and a device for detecting traffic-related information.

The pamphlet DE 103 34 620 A1 discloses generating traffic information by interpreting traffic sign scenarios and navigation information in a vehicle.

The pamphlet DE 10 2008 007 687 A1 discloses an assistance device for a motor vehicle with a processing device and a detection device for control devices.

The pamphlet U.S. 2009/0 195 411 A1 discloses a speed limit information device installed in a built-in navigation system.

Disclosure of Invention

Against this background, the present invention presents a method for providing speed warning information for a navigation device, a data processing device that uses this method, and finally a corresponding computer program according to the main claims. Advantageous configurations result from the respective dependent claims and the following description.

• - Einlesen zumindest einer ersten Geschwindigkeitsbegrenzungsinformation bezüglich einer ausgewählten Wegstrecke, wobei die erste Geschwindigkeitsbegrenzungsinformation aus einem ersten Datenübertragungskanal in eine Datenverknüpfungseinheit des Navigationsgerätes eingelesen wird und Einlesen zumindest einer zweiten Geschwindigkeitsbegrenzungsinformation bezüglich der ausgewählten Wegstrecke aus einem zweiten Datenübertragungskanal in die Datenverknüpfungseinheit des Navigationsgerätes, wobei der erste Datenübertragungskanal physikalisch unabhängig vom zweiten Datenübertragungskanal ist; und
• - Verknüpfen der ersten Geschwindigkeitsbegrenzungsinformation mit der zweiten Geschwindigkeitsbegrenzungsinformation, um die Geschwindigkeitswarnungsinformation für die Wegstrecke zu erhalten.

The present invention provides a method for providing speed warning information for a navigation device, the method having the following steps:

• - Reading in at least one item of first speed limit information relating to a selected stretch of road, with the first item of speed limit information being read from a first data transmission channel into a data link unit of the navigation device, and reading in at least one second item of speed limit information relating to the selected stretch of road from a second data transmission channel into the data link unit of the navigation device, with the first data transmission channel is physically independent of the second data transmission channel; and
• - combining the first speed limit information with the second speed limit information to obtain the speed warning information for the route.

The present invention also creates a data processing device that is designed to carry out or implement the steps of the method according to the invention in corresponding devices. The object on which the invention is based can also be achieved quickly and efficiently by this embodiment variant of the invention in the form of a data processing device, device or appliance.

In the present case, a data processing device can be understood to mean an electrical device that processes sensor or data signals and, depending thereon, outputs control and/or data signals. The data processing device can have an interface that can be configured as hardware and/or software. In the case of a hardware design, the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the device. However, it is also possible for the interfaces to be separate integrated circuits or to consist at least partially of discrete components. In the case of a software design, the interfaces can be software modules which are present, for example, on a microcontroller alongside other software modules.

A computer program product with program code, which can be stored on a machine-readable medium such as a semiconductor memory, a hard disk memory or an optical memory and is used to carry out the method according to one of the embodiments described above, is also advantageous if the program product is used on a computer or a device is performed.

A navigation device is to be understood as a device that reads in measurement or data signals and, using the signals read in, generates an output signal that directly or indirectly assists the driver in guiding the vehicle to a specific destination. Speed warning information can be understood as information that gives a driver of a vehicle an indication of a maximum speed that is permissible for the route currently being traveled by the vehicle. For example, the speed warning information can be a maximum speed for the route currently traveled by the vehicle. The speed warning information can be static information that is only displayed to the driver of the vehicle and indicates which speed limit is currently valid, or the speed warning information can be adaptive information that is output depending on the current speed of the vehicle when there is a risk of exceeding the maximum permissible speed in the stretch of road currently being traveled by the vehicle. A navigation device can be understood as a device that assists a driver in navigating from a start point to a destination point. For example, the navigation device can graphically display a route from the starting point to the destination and/or output the driver with corresponding acoustic information about the route to be chosen. Speed limit information can be understood as information about a maximum permissible speed on the route. A route can be understood to mean a section of a route selected by the driver of the vehicle or the user of the navigation device. A data transmission channel can be understood as a path via which the speed limit information reaches the navigation device. For example, the data transmission channel can be a wireless information transmission channel, as is the case, for example, in a bidirectional form of a wireless Internet connection or in the unidirectional form of a transmission and evaluation of radio data signals. Alternatively or additionally, a stationary data transmission channel can also be provided in that the speed limit information is already stored in a memory in the navigation device or a memory unit of the navigation device and is only read out from this memory. In this case, the speed limit information has already been transmitted to the navigation device before it is put into operation and the information only needs to be read out of the memory in order to have the relevant information available for further processing in the data link unit. Such a data transmission can also be understood as a transmission of information via a data transmission channel. It is only relevant for the implementation of the present idea that speed limit information is read into the data linking unit from two different data transmission channels. A physical independence of the data transmission channels can be understood as a different way or a different way how the information gets into the data link unit. Of particular importance here is reading in information already stored in the navigation device, reading in the information using a unidirectional interface (in particular a read-only interface) or reading in the information using a bidirectional interface (in particular an Internet connection with a computer network). , less the physical transmission of the information through conductor tracks directly in front of the data link unit. Linking the first item of speed limit information to the second item of speed limit information means determining the item of speed warning information using the first and second items of speed limit information. Such a link can be understood to include mathematical or logical operations on the speed limit information to be linked. A link based on a comparison between the speed limit information is particularly favorable because it is technically very easy to implement, with the speed limit information being output as speed warning information that has a previously determined relationship to the at least one other speed limit information item (e.g. less than the other speed limit information item). . In this way, from a plurality of pieces of speed limit information that is valid for a stretch of road, that one can be selected and output to a driver by the navigation device that has a predetermined relationship to at least one piece of other piece of speed limit information.

The present invention is based on the finding that when there is a plurality of speed limit information relating to the same route and which may not be the same, there is always a criterion available in order to provide a user of the system proposed here with a clear statement in relation to a vehicle to be driven to submit speed. In this way, a correction of a possibly outdated speed limit that was entered into a digital road map used when it was created can also be corrected by adopting a value that was called up via an Internet connection, for example. The digital map stored in the navigation device, which is usually not easy to change by the user of the map, can be easily reused in this way by using the updated data relating to a speed limit on the route in question in parallel and sending it to the driver of the vehicle or speed warning information output to the user of the navigation device is only determined by linking the speed limit information read in via the two different data transmission channels.

The present invention offers the advantage of being technically very easy to implement with the simultaneous possibility of being able to use any number of additional data sources in parallel. In this way, digital maps that have been purchased can be used much more effectively, since, in addition to the usually little changed course of the roadway, the maximum speeds to be driven on predetermined stretches of road can be updated using software or circuitry with simple means.

In order to give a user of the approach presented here an overview of the data source or the data transmission path and thereby open up the possibility that a selection can also be made by the user or at least a verification of the information output by the user, in step reading in at least one attribute assigned to the at least first and/or second item of speed limit information, which represents a way from which data transmission channel and/or by which the relevant item of speed limit information was determined and/or verified, the speed warning information item containing the attribute of the at least one item of speed limit information ,
and
wherein the attribute of that speed limit information which is output as the highest-priority speed limit information as speed warning information is also used for an output to indicate the source of the speed limit to the driver.

According to a particular embodiment of the present invention, in the reading step, at least one piece of third speed limit information can be read from a third data transmission channel into a data link unit, the third data transmission channel being physically independent of the first and second data transmission channel. Such an embodiment of the present invention offers the advantage of taking into account a very broad database for the speed limit information, so that there is a very high probability that the speed warning information corresponds to the conditions that are actually currently in force.

It is also particularly advantageous if, in the reading step, the first speed limit information is read from the first data transmission channel, which is used as an interface to a file stored in a memory of the navigation device, as a mobile interface to a computer network or as an interface for receiving via information transmitted by a radio signal. Alternatively or additionally, the second speed limit information can be read from the second data transmission channel, which is designed as an interface to a file stored in a memory of the navigation device, as a mobile interface to a computer network, or as an interface for receiving information transmitted by means of a radio signal. Such an embodiment of the present invention offers the advantage that the speed limit information used is very up-to-date and usually also very reliable.

It is favorable if the first or second speed limit information item is prioritized in the linking step for determining the speed warning information item. Such an embodiment of the present invention offers the advantage that speed limit information on a source known to be very reliable can be given a higher weighting.

To ensure that not just a single speed warning information is provided, but also multiple, albeit not equivalent, speed warning information depending on availability from which, depending on the application, one can also be selected, for example by an external unit, a list of a plurality of items of speed warning information arranged according to priority can be provided in the linking step, in particular with that speed limit information being output as speed warning information in the linking step has the highest priority.

In order to offer the greatest possible flexibility and adaptation to many application scenarios, a step of determining speed limit information can also be provided if no speed limit information is available for a further stretch of road, which is determined using at least two pieces of speed limit information that are assigned to stretches of road. bordering on the further route. Such an embodiment of the present invention offers the advantage that speed limit information, which is estimated from speed limit information that is assigned to adjacent stretches of road, can also be assigned for a stretch of road to which no speed limit information is assigned. In this way it can be ensured that there is also speed limit information for each stretch of a route to be traveled, which information can be used to determine the speed warning information.

According to one embodiment of the present invention, in the linking step, location information of a predetermined object in a predetermined section of the route can also be used to change the speed warning information depending on a current location within the route. Such an embodiment of the present invention offers the advantage that not only is speed limit information used for a stretch of road as a whole, but that a differentiated consideration of a speed limit on these stretches of road is also possible, particularly in the case of longer stretches of road. Such a predetermined object can be understood, for example, as a traffic monitoring system such as a radar device for speed measurement, a speed bump or another object which is suitable for influencing the driver's selection of a driving speed in a positive or negative manner.

• 1 ein Blockschaltbild eines Fahrzeugs, in dem ein Ausführungsbeispiel der vorliegenden Erfindung verwendet wird;
• 2 eine schematische Darstellung der Zusammenführung von Daten aus mehreren Datenübertragungskanälen;
• 3 eine Darstellung, wie eine Geschwindigkeitsbegrenzungsinformation für eine Wegstrecke einer von einem Fahrzeug zu fahrenden Route unter Verwendung von benachbarten Wegstrecken ermittelt werden kann;
• 4 eine Liste von nach Priorität geordneten Geschwindigkeitsbegrenzungsinformationen mit zugeordnetem Attribut über die Gewinnung der jeweiligen Geschwindigkeitsbeschränkungsinformation;
• 5 eine Darstellung einer Ermittlung von unterschiedlichen Geschwindigkeitswarnungsinformationen während einer Fahrt auf einer Fahrtroute;
• 6 Darstellungen von unterschiedlichen Möglichkeiten zur Anzeige eines Attributs einer ermittelten Geschwindigkeitswarnungsinformation für einen Fahrer; und
• 7 ein Ablaufdiagramm eines Ausführungsbeispiels der vorliegenden Erfindung als Verfahren.

The invention is explained in more detail below by way of example with reference to the attached drawings. Show it:

• 1 12 is a block diagram of a vehicle in which an embodiment of the present invention is used;
• 2 a schematic representation of the merging of data from multiple data transmission channels;
• 3 an illustration of how speed limit information for a stretch of a route to be traveled by a vehicle can be determined using adjacent stretches of road;
• 4 a list of prioritized speed limit information with associated attribute about obtaining the respective speed limit information;
• 5 a representation of a determination of different speed warning information while driving on a route;
• 6 Representations of different options for displaying an attribute of determined speed warning information for a driver; and
• 7 a flowchart of an embodiment of the present invention as a method.

In the following description of preferred exemplary embodiments of the present invention, the same or similar reference symbols are used for the elements which are shown in the various figures and have a similar effect, with a repeated description of these elements being dispensed with.

1 shows a block diagram of a vehicle 100 in which a navigation device 110 is provided with an exemplary embodiment of a data processing system 120 according to the invention for carrying out steps of the method according to the invention. The navigation device 110 also includes a memory 130 in which, for example, a digital road map 135 is stored. This digital road map 135 includes, for example, a network of routes that represent roads or paths between individual geographical positions. Speed limit information, which represents a maximum permissible driving speed for vehicles on the relevant stretches of road, can be assigned to these stretches of road. This speed limit information can either be assigned directly to the individual stretches of road in the digital road map 135 as an attribute, or stored as a separate file 137 in the memory 130 . A (first) speed limit 138a, which relates to the route currently being traveled by vehicle 100, can be supplied to data processing unit 120.

Furthermore, the navigation device 110 contains, for example, a mobile transmission unit 140 which is designed to make data from a computer network (such as the Internet) available to the data processing system 120 . This transmission unit 140 can enable bidirectional transmission of data, for example by sending a request signal 142 to one in the 1 not shown server or computer of the computer network or the Internet and a response signal 143 received by this server or computer from the Internet or the computer network and contained in the response signal 143 are made available to the data processing system 120 via corresponding interfaces 144. The data contained in response signal 143 can also represent (second) speed limit information 138b for a route currently being traveled by vehicle 100 . In order to enable such a query of data from a computer from the Internet or from memory 130, navigation device 110 can have a locating unit 145, which determines a current geographic position of vehicle 100 using a satellite navigation system, for example. This current geographical position of vehicle 100 is then made available to memory 130, transmission unit 140 and/or data processing unit 120, for example. The request for speed limit information 138 from a computer in a computer network is described in more detail below.

As a further alternative or additional option for obtaining speed limit information for a current route traveled by vehicle 100, data can be evaluated that are read in via a unidirectional data transmission path, ie a data transmission channel only for receiving data. For this purpose, for example, an evaluation unit 150 can be provided, which extracts data from a transmission signal 152 and makes this data available to the data processing system 120 as speed limit information. Such an evaluation unit 150 can, for example, extract TMC data from a radio transmitter signal and make this data available to the data processing system 120 as further speed limit information 138c. In this case, too, the current geographic position of vehicle 100 determined by locating unit 145 can be used to extract the relevant data from transmission signal 152 .

Speed limit information 138, which is read into data processing unit 120 from the different data transmission channels such as memory 130, transmission unit 140 or evaluation unit 150, can be linked in data processing unit 120, which can also be referred to as a data linking unit. An essential aspect of the present invention is that speed limit information 138 is read into the data processing unit 120 from two physically different data processing channels. In data processing unit 120 or the data linking unit, speed limit information 138 that has been read in is now linked with one another in order to generate hazard warning information 160 that can be output to a driver 180 via a further interface 165 and a display device 170 of navigation device 110 . Alternatively, the generated hazard warning information can be distributed via a further interface in the vehicle, so that further data processing units can use this hazard warning information to make further calculations/links.

• - Kartendaten;
• - Blitzerwarner (Hazard Spot Warning), der beispielsweise mittels eines Datenstroms empfangen wird, der aus einem Rundfunksignal ausgelesen wird;
• - Online-Blitzerwarner und/oder
• - TMC-Meldungen, etc.

An exemplary embodiment for determining speed warning information is explained in more detail below. To implement this embodiment, a current navigation system may have more than one data source (ie, communication channel) for speed limits, such as e.g. e.g.:

• - card data;
• - Blitzerwarner (Hazard Spot Warning), which is received, for example, by means of a data stream that is read from a radio signal;
• - Online speed camera alert and/or
• - TMC messages, etc.

All (or at least several) available data sources should be used to find the most plausible speed limit (as speed warning information) at the vehicle's current position. This speed limit can then be made available to other control devices in the vehicle (such as a cruise control) in order to operate further data merging or be displayed directly to the driver. 2 FIG. 12 shows a schematic representation of, for example, speed limit information from a TMC data transmission channel 210, a speed camera warning device 220 and a digital map 135 of a data linking unit 120, which provides information about a (most plausible) speed limit as speed warning information 160.

However, the first stage of data merging can be performed, for example, as pre-linking by a compiler 230 from raw map data 240, i. H. made in the map data 135 itself. This linking can be performed in the compiler 230 of the memory, which in this case operates as a pre-linking unit in the data processing system 120 . The speed limits (i.e. speed limit information) for each stretch of road included in a route to be traveled by the vehicle are provided differently depending on the data provider.

A well-known supplier of digital road maps and navigation devices, e.g. B. supplies the speed limits as an attribute to a road or path segment. This attribute also gets the information "verified" if the speed limit has been checked. Another supplier of the digital map provides the information as to whether the speed limit is based on administrative rules (e.g. 100 km/h on country roads) or on traffic signs. Map areas that do not contain any speed limits can be “intelligently” filled in, e.g. B. the legal speed limit is added as an attribute to the corresponding road section. Under certain circumstances, however, this can lead to non-logical speed restrictions. Intelligent padding of speed limits on stretches of road where no speed limit has been assigned can be done by evaluating all speed restrictions on the access roads to that stretch of road and applying the lowest speed limit for the "empty" area. An example can be the roundabout "Niehler Ei" in Cologne, as it is in the 3 is shown as an example. Roundabout 310 does not have a speed limit associated with it in raw data 240 . A value of 30 km/h is assigned to all entrances 320 of the roundabout 310 as a speed limit. According to the "intelligent filling" procedure, the "Niehler Ei" 310 roundabout is also assigned a speed limit of 30 km/h.

Map data 135 is the oldest data in the navigation device. The speed limits were collected by the data provider a long time ago and may now be out of date. In addition, the quality basically depends on the data supplier and the type of data collection. For example, there are four different categories of speed limits in the map data 135. The first category contains speed limits that are based on “intelligently” filled-in data. The second category contains speed limits that carry the attribute "verified", i. H. that have been verified. The third category contains speed limits based on administrative regulations (speed limits on road classes). The fourth category contains speed limits defined by street signs at specific locations. For each of the speed limits, an attribute can also be stored in the map data, which gives an indication of which of the named categories the speed limit relates to.

The speed camera warning data 220 includes two categories, for example: The first category includes data that is present on the data carrier for navigation. This data is often stored on the data medium as “side files”, so that the data can be updated more quickly than with the map data 135. A side file is a separate data file 137 that has no connection to the map data 135. The second category contains online speed camera data (e.g. corresponding to the speed limit information 138b from 1 ), which are promptly distributed over the Internet, so that the driver is warned in good time of speed cameras or speed cameras. As a result, the speed camera data is always more up-to-date than the map data 135 and should also be used when determining the speed limits.

TMC messages can contain speed limits 138c for certain sections of the route. This is especially true for construction sites. Since the TMC reports are distributed via radio or broadcasting 152, they are just as up-to-date as the data from the Internet but more up-to-date than the speed camera data from the data carrier. However, since the TMC message is based, among other things, on police data, in contrast to speed camera warning data originating from the community, the TMC messages or speed limit information 138c resulting therefrom should have a higher priority than, for example, the speed limit information 138b from the speed camera warning data.

Due to the up-to-dateness of the data described above, a priority order can be established in the speed limits as warning information 160 from the existing Data sources 410 (ie data transmission channels) can be extracted and made available to the driver or the external control device. For example, such a prioritization by setting up a table 400 according to the 4 take place. Here, speed warning information 160 is evaluated as the lowest priority P, which comes from speed limit information from data transmission channel 410 of an intelligently filled-in map (position 420), with such speed limit information being able to be evaluated with the attribute "estimated" E, since such information is not on a reliable basis has been established. Speed limit information from a data transmission channel of a verified route from a digital road map (position 430) can be understood as speed limit information with the next higher priority, with the attribute “verified” V being consequently assigned to such speed limit information. Further in the order of priority is speed limit information based on a digital map using information about an administrative regulation (item 440) with an attribute "derived" D and speed limit information based on a digital map using information about a road sign on the currently traveled route (position 450) with an attribute "postulated" P provided. Even higher in priority are speed limit information based on speed camera warning data from the data carrier (position 460 in the table) with an attribute "controlled" C and then speed limit information based on online speed camera warning data (position 470) with an attribute "announced" A. However, the highest priority is assigned to speed limit information received on the basis of a TMC message TMC, such speed limit information also being assigned the attribute “announced” A.

The speed limit with the highest priority P (i.e. with the lowest value) should be made available to the driver or the external control unit. The value in the "Attribute" column can also be used to tell the driver or the external control unit which data source the speed limit came from.

The most complex merging of data concerns the speed camera data. While the speed limits are usually route attributes, speed camera data are point attributes related to geographic locations. The speed limit in the data only applies to the point at which the speed camera is located. Therefore, the following algorithm can be used to merge the point and link attributes, as shown in the example in the 5 is pictured.

In the first segment S1 of route 500, the speed limit is 70 km/h, which can be read out or read in, for example, from digital map data and/or an evaluation of traffic signs, for example an optical vehicle environment recognition unit. This speed limit should also be made available to the driver 180 (or the external control device) as speed warning information 160 . In the second segment S2 the speed limit is 90 km/h. At the end of the second segment S2 there is also a speed camera 520 or a speed measuring point that detects the vehicle 100 when it is driving faster than 80 km/h. If the vehicle 100 is at the beginning of the segment S2, the speed limit of 90 km/h should be shown to the driver 180 (or the external control device) as speed warning information. If the vehicle 100 comes within the range of the distance D1 to the speed camera 520, the speed limit of the speed camera (80 km/h) should be displayed to the driver (or the external control unit). This speed limit is to be displayed (or sent to the external control device) until vehicle 100 has left distance D2 after speed camera 520 . The speed limit is then displayed by the third segment S3 to the driver 180 (or the external control unit). The data on the respective maximum speeds to be driven can be read into vehicle 100 or navigation device 110 on different data transmission channels, as already described above.

The attribute of those speed limit information in the table 4 contained and output as speed warning information as top-priority speed limit information can also be used for an output to indicate the source of the speed limit to the driver. This can e.g. B. by means of the output of graphics on the display device 170 in the form of another icon with additional information on the icon for the maximum speed allowed, as in the 6 is shown. For example, in the illustration above, the 6 signals a driver with a speed limit of 80 km/h, which was obtained from the internet. In the second icon from the top in the 6 can a signaling a Speed limit of 80 km / h done, which was obtained by evaluating a radio signal, such as TMC information. In the third view from the top 6 a speed limit of 80 km/h is signaled, which is based on the evaluation of speed camera warning data from a data medium, with the middle lower representation from the 6 signals a speed limit of 80 km/h, which results from the intelligent addition of speed limit data from neighboring routes to the route currently being traveled on. If it is not possible to determine an attribute A, a question mark can also be output in order to convey this state to the driver as well, so that the driver 180 of the vehicle 100 can likewise interpret the output speed limit accordingly.

7 shows a flowchart of an embodiment of a method 700 for providing speed warning information for a navigation device, wherein the method 700 includes a step of reading 710 at least one piece of first speed limit information relating to a selected stretch of road, the first speed limit information being read from a first data transmission channel into a data linking unit of the navigation device . In step 710 of reading in, at least one second item of speed limit information relating to the selected route is also read in from a second data transmission channel into the data link unit of the navigation device, it being possible for the first data transmission channel to be physically independent of the second data transmission channel. Furthermore, the method 700 includes a step of linking 720 the first speed limit information item with the second speed limit information item in order to obtain the speed warning information item for the stretch of road. Finally, the method 700 includes a step in which the navigation unit outputs 730 the speed warning information.

The exemplary embodiments described and shown in the figures are only selected as examples. Different exemplary embodiments can be combined with one another completely or in relation to individual features. An exemplary embodiment can also be supplemented by features of a further exemplary embodiment.

Furthermore, method steps according to the invention can be repeated and carried out in a different order from that described.

If an embodiment includes an "and/or" link between a first feature and a second feature, this should be read in such a way that the embodiment according to one embodiment includes both the first feature and the second feature and according to a further embodiment either only that having the first feature or only the second feature.

Claims (9)

Method (700) for providing speed warning information (160) for a navigation device (110), the method (700) having the following steps: - reading in (710) at least one first piece of speed limit information (138a) with regard to a selected route (320, S1 , S2), the first speed limit information item (138a) being read from a first data transmission channel into a data linking unit (120) of the navigation device (110), and at least one second speed limit information item (138b) relating to the selected route (320, S1, S2) being read in from a second data transmission channel into the data link unit (120) of the navigation device (110), the first data transmission channel being physically independent of the second data transmission channel; and - linking (720) the first speed limit information (138a) with the second speed limit information (138b) in order to obtain the speed warning information (160) for the route (320, S1, S2) in the step of reading (710) at least one of the at least first (138a) and/or second (138b) speed limit information is read in, which represents a way from which data transmission channel and/or on which the relevant speed limit information (138a, 138b, 138c) was determined and/or verified, wherein the speed warning information (160) contains the attribute (A) of the at least one piece of speed limit information (138a, 138b, 138c), and characterized in that the attribute of that speed limit information which is output as speed limit information with the highest priority as speed warning information is also used for an output to indicate the source of the speed limit to the driver. Method (700) according to claim 1 , characterized in that in the step of reading (710) at least a third speed limit information (138c) from a third Data transmission channel is read into a data link unit (120), the third data transmission channel being physically independent of the first and second data transmission channel. Method (700) according to one of the preceding claims, characterized in that in the step of reading (710) the first speed limit information (138a) is read from the first data transmission channel which acts as an interface (144) to a memory (130) of the navigation device (110) stored file (135), as a mobile interface to a computer network or as an interface (144) for receiving information transmitted by means of a radio signal (152) and/or wherein the second speed limit information (138b) from the second Data transmission channel is read in, which is used as an interface (144) to a file (135) stored in a memory (130) of the navigation device (110), as a mobile interface (144) to a computer network or as an interface (144) for receiving information transmitted by means of a radio signal (152). Method (700) according to one of the preceding claims, characterized in that in the step of linking (720) to determine the speed warning information (160), the first (138a) or second (138b) speed limit information is prioritized. Method (700) according to one of the preceding claims, characterized in that in the step of linking (720) a list (400) of a plurality of items of speed warning information (160) arranged according to priority (P) is provided, in particular wherein in the step of linking (720 ) that speed limit information (138) is output as speed warning information (160) which has the highest priority (P). Method (700) according to one of the preceding claims, characterized in that if no speed limit information (138) is available for a further stretch (310), a step of determining speed limit information is provided which is determined using at least two pieces of speed limit information (138) it is determined which routes (320) are assigned which adjoin the further route (310). Method (700) according to one of the preceding claims, characterized in that in the step of linking (720) location information of a predetermined object (520) in a predetermined section of the route (S2) is also used to, depending on a current location within the route (S2) to change the speed warning information (160). Data processing device, the units (144, 120, 165) which are designed to carry out the steps of a method (700) according to one of Claims 1 until 7 to perform. Computer program with program code for carrying out the method (700) according to one of Claims 1 until 7 , when the computer program is executed on a device, a navigation device (110) or a data processing device (144, 120, 165).

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