FR2809855A1 - METHOD FOR ADJUSTING THE COEFFICIENT OF ENLARGEMENT (ZOOM) OF A MAP DISPLAY SYSTEM IN A VEHICLE - Google Patents

Abstract

The zoom setting is calculated based on a variable zoom coefficient in the map display system (10). The respective zoom coefficient is calculated using a calculation unit (17) according to the data of points of interest (11), the path data (13) and the speed (15) of the vehicle. A corresponding card extract is represented by the display unit (19).

Description

The present invention relates to a method for adjusting the

  zoom of a map display system in a vehicle.

  State of the art The systems for representing maps, known for example in a navigation system within the framework of the machine / man interfaces in the vehicle, there are zooms (magnification coefficients) fixedly fixed, preselected by driver

  of the vehicle. The driver then has to select the coefficient himself.

  cient of enlargement desired or suitable for extracting information

  appropriate io mations of the map display system.

  Other information going beyond the simple representation

  tation of maps for the proposed route in a traffic display system

  known cards can only be called as part of a card

  detailed, specific characteristics of the proposed route. Such known card representation systems have the disadvantage of being relatively

  rigid and not very pleasant to use.

Advantages of the invention

  The object of the present invention is to remedy these drawbacks.

  This relates to a method for adjusting the zoom in a system for displaying maps of a vehicle, characterized in that the adjustment of the zoom is made as a function of a zoom coefficient, which is variable, calculated by the

map display system.

  As the variable magnification (zoom coefficient) is automatically calculated by the map display system, the zoom setting of this display system can be adapted to the

  instant operating condition of the vehicle. This allows for con-

  center the emission or display of cartographic information such as for example a certain section of the local road network path over an area which is currently significant for the driver of the vehicle. Such automatic adaptation of the zoom by the map display system to the respective current operating situation of the vehicle will give

  the user, quickly and reliably the information desired or necessary

  receipts in the form of a card extract appearing on the unit

  display at the appropriate magnification. Thus driver of the vehicle

  cule will be less diverted from its environment by the display system

  Cards; he will be able to focus better on the road traffic

  actually said. The interesting adjustment of the zoom each time is done using the

  card display system and thus without direct intervention of cons

driver of the vehicle.

  Advantageously, the zoom coefficient is calculated in

  function of a predetermined variation in magnitude of at least one para-

  vehicle operating meter. This allows an adapted calculation

  during operation for the required zoom coefficient and thus one op-

  shifts the zoom setting using the map display system. The

  zoom coefficient is optimized according to the operating state of the vehicle

  runs, automatically and without direct driver intervention,

  0o to ensure a zoom adjustment for which the driver of the vehicle

  quickly and reliably, the information desired or necessary by the

map display system.

  The operating parameter is advantageously the

  vehicle speed. Speed is particularly suitable as a

  operating rameter to calculate the zoom coefficient because speed influences the interval during which the driver of the vehicle must receive the information necessary to make an appropriate decision. At a low vehicle speed, the driver has more time to receive information concerning a certain segment of the journey, currently defined, than at a high speed. As a result, for a low vehicle speed, the calculated zoom coefficient is relatively large and for a high vehicle speed, the coefficient is relatively small. The expression "large zoom coefficient" (large coefficient

  enlargement) is synonymous with a more detailed representation

  putting to present a small extract of card. A small coefficient of the zoom represents correspondingly, a small degree of details allowing to represent a large extract of map. In these conditions, the driver of the vehicle is not excessively requested by information

  too detailed when traveling at high speed while at relatively high speed

  vehicle slowly, it can receive detailed information,

  concrete, desired, in a determined time interval, by the system

map display theme.

  Preferably for the calculation of the zoom coefficient, we take

  account of predetermined minimum time intervals. For varia-

  abrupt and brief speed measurements, thus avoiding a new coefficient

  zoom calculated each time because under these conditions, due to a renewal

  permanent display of the cards displayed, the driver's attention would be

  unnecessarily diverted to display the map display system.

  Advantageously, the zoom coefficient is calculated as a function of the trip data recorded in the map display system. Since the trip data recorded in the map display system contains information relating to points of interest (route locations necessary for the driver to make a decision) where the driver must make a decision (by example of intersections, entrances of localities, or

  similar situations) to allow for consideration of such internal points

  springs, and calculate an appropriate zoom coefficient and thus an adjustment

  i0 optimized for the zoom compared to the stored trip data.

  Preferably, the zoom coefficient is calculated as a function of the length of the journey between the location of the vehicle and the

  next interesting point. The expression point of interest designates an em-

  placement where the driver must make a decision regarding the route. An interesting point can be for example an intersection, a

  entry of locality or similar situation. We seek in principle to in-

  train the driver of the vehicle at least the point of interest using the card display system. So that the driver has sufficient perception time to detect and process the respective information, account is also taken of the length of the journey between the instantaneous location of the vehicle and at least the following point of interest, that is to say preferably also say the speed of movement

  of the vehicle to calculate the zoom coefficient.

  Advantageously, the next point of interest is a point on the route at which the driver of the vehicle must make a decision.

  concerning the journey. Only the points on the route where the driver must take

  It is interesting to make a decision or change your behavior. This is why the zoom coefficient is calculated among other things according to the next interesting point. A route decision may for example concern the

  journey or a reduction in speed (driving behavior).

  According to a preferred embodiment, the point in-

  next interesting is a point of the path where beyond a minimum time interval compared to the current location, is reached by the vehicle with its current speed. Such a minimum time interval can for example be of the order of one minute so that the next point of interest on the route at which a decision is to be taken will be reached at the earliest after one minute, from the current location of vehicle at its

  current speed. The driver thus receives from the car display system

  your current location and point of interest

  coming next; it is always guaranteed to have sufficient time to receive and process information. For representation

  a card extract on the display unit of the car display system

  You can take into account an additional marginal area compared to the path between the current location and at least the next point of interest so that the current location and at least the next point of interest can be represented in the central area of the card extract

  to be better and faster perceived by the driver.

  The minimum time interval is preferably variable specific to the vehicle. As the minimum time interval required to collect and process information may be different

  for the various drivers, it is interesting to be able to influence indi-

  this minimum time interval, because in this way we will have a success

  transfer of correct and user-friendly representations of the different card extracts on the display unit of the display system

Cards.

  Drawings The present invention will be described below in more detail

  detailed using an example embodiment shown in the single figure

  attached gure which is a block diagram of a map display system

according to the invention.

  Description of an embodiment

  The single figure shows a block diagram of a map display system generally bearing the reference 10 in particular of a road map display system, for example in a navigation system of a motor vehicle (not shown ). The map display system 10 includes a point data memory

  interesting 1 1, a trip data memory 13 and a measurement unit

  vehicle speed 15; these different units cooperate by means of data transmission lines represented by the

  arrows 12, 14, 16 or for a data transmission function, (pro-

  gram) with a unit for calculating an enlargement coefficient (zoom) 17. The unit for calculating the enlargement coefficient (zoom) 17 is connected so as to cooperate by means of a transmission line of data represented as an arrow 18 or a function of

  transmission of data (program) to a display unit 19 of the system

  card display unit 10. There is also a predefined unit.

  termination 20 which cooperates via a data transmission line represented by an arrow 21 or a data transmission function (program) that the "coefficient calculation unit"

  magnification (zoom) 17. The predetermination unit 20 is used for intro

  s infer the driver preferences of the vehicle, for example for the success

  chronological transfer of cards or information intended for the unit

display 19.

  Unit 17 calculates a zoom coefficient, appropriate according to the data of the point of interest (memory unit 11), the data of

  o0 trip (memory unit 13) and the data concerning the speed respected

  vehicle (measurement unit 15). So to calculate a coefficient of

  zoom, appropriate, next to the parameters corresponding to time, information

  location and map data, we also take into account

  of the respective vehicle speed to set the succession of representations

  chronological sensations of maps with zoom coefficients, different

  rents, in a manner compatible with the human eye. This means that at a relatively high vehicle speed, relatively few points of interest (detailed information) of the vehicle path will be represented on

  the display unit 19 while for a lower speed of movement

  ble of the vehicle, there will be relatively many points of interest-

  health and thus corresponding detail information.

  For example, the zoom setting for a motorway journey on a motorway consists of displaying the next major city or the next motorway crossing on the display unit 19 of the display system of

  maps 10. For an average speed of 130 km / hour, it will be uniform

  only account of the points of the journey (points of interest) located beyond a radius for example of 2 kilometers around the current location

of the vehicle.

  If the vehicle is moving in the city with a speed for example-

  full of 50 km / hour, we will have the intersections of streets located for example

  outside a radius of 1 kilometer.

  On a national road, for a vehicle traveling at a speed of 100 km / hour, we will give the crossings of the roads with the national roads, the entrances of localities or localities neighboring the national road taken and located beyond a radius for example of 2 kilometers which will be considered as interesting points; the zoom will be adjusted correspondingly to appear in the extract of

card on display unit 19.

  The calculation unit 17 of the zoom coefficient can be

  set up by a central processing unit CPU which is suitable for quickly and reliably calculating the respective road segment and the zoom coefficients. This makes it possible to calculate automatically and thus without any other intervention from the driver of the vehicle, a zoom coefficient suitable for each choice and to display a corresponding map detail on the display unit 19 so that the driver of the vehicle is informed with a

  minimum delay, from the next interesting point and can take a decision

  appropriate. To respect the minimum time interval, as indicated above, the respective vehicle speed is used in the zoom coefficient calculation unit 17 as the input quantity for a

  appropriate choice or to determine points of interest.

Claims (8)

  1) Method for adjusting the zoom of a map display system in a vehicle, characterized in that the zoom is adjusted as a function of a variable zoom coefficient,   calculated by the map display system (10).   2) Method according to claim 1, characterized in that the zoom coefficient is calculated according to a variation of magnitude   predetermined of at least one operating parameter of the vehicle.   3) Method according to claim 1, characterized in that   the operating parameter is the vehicle speed.   4) Method according to claim 1, characterized in that the calculation of the zoom coefficient takes into account the time interval of   predetermined minimum operation.    ) Method according to claim 1, characterized in that   the zoom coefficient is calculated based on the memo path data   in the card display system (10).   6) Method according to claim 1, characterized in that the zoom coefficient is calculated as a function of the length of the path between   the instantaneous location of the vehicle and the next point of interest.   7) Method according to claim 1, characterized in that the next interesting point is a location of the path o driver   of the vehicle must make a decision regarding the route.   8) Method according to claim 1, characterized in that the following point of interest is a location of the path which is reached   beyond a minimum time interval from the location ac-   tuel, with the vehicle for a certain speed of movement.   9) Method according to claim 1, characterized in that   the minimum time interval is specifically variable depending on driver of the vehicle.