DE10202756A1 - Digital map of traffic route network with temperature data has route data relating to traffic route network, attribute data including temperature data for air and/or for road surface - Google Patents

Abstract

The digital map (50) has route data relating to a traffic route network that can be traveled and associated attribute data, whereby many attribute data items include past attribute data in addition to current attribute data. The attribute data include temperature data for the air and/or for the road surface. The digital map is updated using a sampling vehicle. AN Independent claim is also included for the following: a method of generating vehicle navigation information.

Description

The invention relates to a digital map of a Traffic network according to the preamble of claim 1 and a method for generating vehicle guidance information according to the Preamble of claim 5.

A generic digital map of a traffic route network and a generic method for the production of Vehicle guidance information is described in DE 199 16 967 C1. The digital map of a traffic route network includes route and associated attribute data from at least one Test vehicle taken from each traveled section become. The digital map is taken from the recorded Updated attribute data. Historical metrics for attributes are saved. The digital map is the basis for the Generation of vehicle guidance information, wherein for the Generation of the vehicle guidance information the current Vehicle position and the lying in front of the vehicle section is taken into account.

In "Patent Abstracts of Japan", JP 11025389 A, a Information system described in the vehicles temperature data record and transmit to a central office. In the main office the coefficient of friction of the road is determined and to other vehicles transfer.

The object of the invention is to provide a digital map and a Method for generating vehicle guidance information of to create the type mentioned above, which is the driving safety of the Vehicle increases.

The invention solves this problem by providing a digital card with the features of claim 1 or by the provision of a method for the production of Vehicle guidance information with the features of claim 5. The dependent claims relate to advantageous education and Further developments of the invention.

In the digital map are local and distance Attribute data stored. Attribute data include e.g. B. topology data over the slope and curve. At the digital map is further provided that locally accurate data on the Air temperature and / or the surface temperature as attribute data get saved. The current and local Temperature data is recorded by a vehicle and the recorded Data for updating the in the digital map stored temperature data used. Advantageously, the Temperature data also stored time based, so that z. B. between temperatures in the morning and during the day or in summer or a distinction in winter. That's why it is advantageous also store historically recorded data to to be able to select the most accurate dates in a timely manner.

The storage of temperature data as attribute data is advantageous because the driving safety is very strong different coefficients of friction of the road surface is influenced. The coefficient of friction is, among other things, due to the temperature influenced the street. The recording and determination of a The coefficient of friction of the road surface is very complex and complicated. The recording and storage of temperature data is easier and cheaper to realize and gives one Clue about possible danger points. The recording or Measurement of the temperature for the current position, eg. B. directly under the vehicle or in front of the vehicle, is easily possible.

When driving the vehicle, temperature profiles of the recorded routes are stored and stored. It can also statistical data on time-related courses of the Temperature profiles are generated. In the map z. B. significant temperature drops recorded, which then in further Rides in advance can be queried from the map. at Use of the temperature sensor for the outside temperature are Locate localizable at which the ambient temperature is lower, z. B. in forest pieces. By special measurement of Road temperature z. B. directly under the vehicle are also cold surfaces, eg. B. detectable on bridges. This Temperature data is considered current data and / or historical Gradients stored in the digital map. By use the existing temperature sensors for the outside temperature and / or the simple measurement of the local Surface temperature and storage in a digital map is created a cost effective solution.

The temperature data can also wirelessly z. B. to a central office be transmitted. The control panel in turn checks the received Data plausibility and stores the data of several Vehicles in a digital map in the head office. Of the Central can then request or periodically current Route and attribute data, including temperature data, to which Vehicles are transferred. The vehicles can theirs digital cards through the data received from the central office complete.

The collection of data can be done at any temperature since typical cold spots in summer as in winter be found again. The temperature is altogether on another Level, but z. B. a forest is also clear in the summer cooler than the general mean temperature.

The digital map described can be advantageous in the described below method for the production of Use vehicle guidance information.

In the method of generating Vehicle guidance information, it is particularly advantageous in the generation of Guide information the road temperature already clearly in advance Know by the digital map to get the driver on time to prepare the vehicle dynamics control systems or in extreme cases, to throttle the speed automatically. This method can be used with so-called. Forward-looking sensors be combined. These measure the road temperature a bit before the vehicle and are ideally very high above the road mounted to have a lookahead horizon. One such Sensor that has to measure through the windshield, but has u. U. to fight with the disk pollution. Such a Sensor is further at street crests, vehicles in front and curves only in combination with the digital map in the Lies to provide timely information. The Knowledge of the temperature profile on the front of the vehicle lying section of the route is by storing the Temperature data in the digital map regardless of the Visibility conditions on the stretch. By mutual Comparison of the data stored in the digital map and the Data of the predictive sensor, can simultaneously one Plausibility check, an error value determines and with this an error correction of the sensor be performed.

The driver can thereby without a complicated determination of the Coefficient of friction of the distance ahead in the task be supported, potentially dangerous places, z. B. on Bridges, in shady places, to recognize and accordingly to drive carefully. When deciding whether an information is output to the driver is advantageously also the average temperature z. B. the day or the whole route considered. So z. B. in the summer before a warning Apart from bridges.

Advantageously, in a warning of the driver not only the temperature to be considered, but also several Dynamic driving parameters present in the vehicle. If the vehicle obviously far away from the border area moved, the driver need not be warned.

The process can either be purely informative, i. H. to the Driver hints, recommendations and / or warnings about a optical and / or acoustic and / or haptic Issue output device, or active in control systems of the vehicle, such as z. As brake systems, transmission controls and / or Motor controls, intervene. Of course, the combination of Notes with active intervention of the method conceivable.

It is also beneficial to the process of the current one Route, current location information and more Sources of information B. RDS / TMC the type of road being driven, to take the time of day, traffic information, etc. and the Notes or interventions in control systems of the vehicle on it vote.

In an advantageous embodiment of the method is a current route is determined so that the Vehicle guidance information also generated beyond the next intersection can be. The current route can be in a vehicle existing route guidance system, in which the driver Destination entered. The determination of the current route can also determined on the basis of previous travel routes of the vehicle become. In addition to the learning digital Card in a storage medium also the typical goals and detected preferred routes that drives a driver. This can typically done without input from the driver by after a longer stop the current location than typical Destination is saved. The advantage of this solution is that the driver has the benefit of vehicle guidance information about reach the next intersection without your own input can. The systems increase their efficiency independently by continuously learning and expanding their Wealth of experience. By making the current route for the Procedure is based, the process can look ahead the whole route related work and not only depends on the current position and direction of travel with the front of the vehicle lying intersections.

A preferred embodiment of the invention is based on the only drawings described below. It shows in schematic representation,

Figure is an illustration of a vehicle system with the Ability to record and save Temperature data in a digital map and for the generation of Vehicle management information.

The outside temperature sensor 10 and / or the surface temperature sensor 10 shown in the figure outputs its sensor data to the filter 20 and the filter 30 . The filter 20 performs long-term filtering of the temperature to determine the long-term temperature level. As a result, z. B. the seasons are determined. The filter 30 performs a short-term filtering of the temperature to determine the local temperature sinks. These data serve z. For example, to detect cold spots in forests or on bridges. The filters 20 and 30 output their determined filtered temperature levels to the unit 40 . In unit 40 , the decision is made as to when temperature data is stored as attributes. The unit 40 knows about the current location and has the ability to read existing attribute data from the digital map 50 . The storage can z. B. triggered at high temperature drops. It is further possible that the unit 40 compares the temperature data stored in the digital map 50 with currently available and, in the case of large deviations, makes the storage of the temperature data in the digital map 50 . It is also possible to always store the current temperature data in the digital map, in order to have a large database of historical temperature gradients, which allow a statistical evaluation.

The unit 60 , which generates the vehicle guidance information, cyclically reads out temperature data from the digital map 50 for the respective road section ahead of the vehicle. Further, distance information about the next cold point ahead is generated. If necessary, the driver is informed about the upcoming cold point and / or passed this information to the vehicle control systems. It is also possible to output the information to a route guidance system, which then outputs warnings together with route guidance information and displays location-specific warnings and / or the temperature prevailing at the critical location on the graphic display of the digital map on a screen.

Claims (9)

A digital roadmap ( 50 ) of a traffic route network comprising route data via a trafficable traffic route network and associated attribute data, wherein some attribute data include not only the current attribute data but also past attribute data, characterized in that the attribute data include temperature data of the air and / or the road surface. 2. A digital map according to claim 1, characterized in that the digital map ( 50 ) is updated by at least one test vehicle, the current attribute data are taken from each driven section of the traffic network and the digital map ( 50 ) is updated based on the recorded attribute data. 3. Digital card according to claim 1 or 2, characterized in that the digital map ( 50 ) is stored in a vehicle and / or a central office. 4. Digital card according to claim 3, characterized in that the digital map ( 50 ) stored in the vehicle is updated by externally, in particular a central, received attribute data. 5. A method for generating vehicle guidance information in which the current vehicle position is determined, route data and associated attribute data are read from a digital map ( 50 ), and depending therefrom vehicle guidance information for the current vehicle position and taking into account the path ahead of the current vehicle position and the generated attribute data are generated, characterized in that the attribute data include temperature data of the air and / or the road surface. 6. Method for generating vehicle guidance information according to claim 5, characterized, that some attribute data is next to the current attribute data also include past attribute data, 7. A method for generating vehicle guidance information according to claim 5 or 6, characterized in that the digital map ( 50 ) is stored in a vehicle and / or a control center. 8. A method for generating vehicle guidance information according to claim 7, characterized in that the digital map stored in the vehicle ( 50 ) is updated by externally, in particular a central, received attribute data. 9. A method for generating vehicle guidance information according to one of claims 5 to 8, characterized, that a current driving route of a vehicle under Use of previous travel routes of the vehicle is determined.