EP3673238A1 - Procédé permettant de générer des propositions d'itinéraire de remplacement - Google Patents

Procédé permettant de générer des propositions d'itinéraire de remplacement

Info

Publication number
EP3673238A1
EP3673238A1 EP18743007.9A EP18743007A EP3673238A1 EP 3673238 A1 EP3673238 A1 EP 3673238A1 EP 18743007 A EP18743007 A EP 18743007A EP 3673238 A1 EP3673238 A1 EP 3673238A1
Authority
EP
European Patent Office
Prior art keywords
route
waypoint
initial
alternative
initial route
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18743007.9A
Other languages
German (de)
English (en)
Inventor
Jens Gelhar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neusoft Technology Solutions GmbH
Original Assignee
Neusoft Technology Solutions GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neusoft Technology Solutions GmbH filed Critical Neusoft Technology Solutions GmbH
Publication of EP3673238A1 publication Critical patent/EP3673238A1/fr
Pending legal-status Critical Current

Links

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
    • G01C21/34—Route searching; Route guidance
    • G01C21/3407—Route searching; Route guidance specially adapted for specific applications
    • G01C21/343—Calculating itineraries, i.e. routes leading from a starting point to a series of categorical destinations using a global route restraint, round trips, touristic trips
    • 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

Definitions

  • the present invention relates to a method for generating alternative route suggestions and a corresponding system, preferably navigation system.
  • the known methods are based on a manipulation of the cost model used for route search. Either a completely different model is used, such as a short instead of a fast route, or the roads of the first route found are priced differently from other roads to favor a bypass. This often results in routes that are unnecessarily bad according to the criteria actually intended by the user, ie the chosen cost model.
  • Another object of the present invention is to avoid streak trips, since in particular the ratio of the route costs of the detour is exorbitantly high compared to the bypassed section. Such alternative routes are discarded and, if available, more reasonable alternatives are offered.
  • Another object of the present invention is to find an alternative route that differs from the original route. Since the artificial waypoint "Signature-Link" is always chosen off the original route, the alternative route will differ from the original route at least in the area of the waypoint.
  • Another object of the present invention is to detect pseudo alternatives and discard them.
  • the user In addition to the known and researched calculation of the initial "best" route, the user should be presented with one or several further routes to the same destination and offered for navigation, which should be significantly different from the initial route, due to the same criteria as the the initially calculated route be favorable and in total come close to what the human user perceives as a sensible driving alternative. Therefore, in the present invention, the cost model is not changed and remains consistent. The determination and evaluation of alternative routes is based on the original cost function.
  • Alternative routes are evaluated in comparison to the originally found route.
  • the desired properties of the alternative route can be approximated and unwanted artifacts (detours unintelligible to the user) of the prior methods can be excluded.
  • the present invention contemplates a wide variety of possible route variations simultaneously and compares them to the best route, respectively.
  • the long-distance bypasses only have considerable disadvantages and also small-scale variants, for example near the start and the destination, are found and correspondingly better assessed.
  • One advantage of the present invention is that the initial route calculation is used to define criteria for desired types of alternative routes and to determine the "easy" waypoint that produces the best result.
  • Another advantage of the present invention is that pseudo-alternatives, long-range detours, crossings and artifacts are avoided and discarded.
  • expanded connection possibilities are potential waypoint candidates.
  • the expanded connection possibilities of the initial route calculation are taken into account.
  • a bidirectional route calculation and / or an alternate route calculation takes place.
  • the selection of alternative route suggestions is considered, preferably simultaneously, and compared with the initial route.
  • cost parameters of the specific deviating section and of a bypassed section of the initial route are taken into account.
  • track length parameters of the bypassed section on the initial route are evaluated.
  • a position of the waypoint, within the section deviating from the initial route can also be taken into account.
  • Other properties, such as average speed, tunnel lengths, toll costs, travel time, or abstract route costs, etc. can also be assessed.
  • small deviations are evaluated differently than deviations near the route center of the initial route.
  • the deviating section has a minimum length of, preferably 25 km for a motorway-like route or a minimum length of, preferably 200 m for short distances. Of course it is possible to set different minimum lengths.
  • the waypoint is preferably located centrally on the deviating section.
  • a backward expansion is performed on the basis of the ascertained cost and route length parameters of the expanded route suggestions of the initial route calculation.
  • the system implementing the method is a navigation system.
  • FIG. 1 embodiment of a waypoint candidate (also referred to here as a signature link candidate);
  • FIG. Fig. 2 embodiment of the evaluation of possible alternative routes;
  • Fig. 3 embodiment of a calculated alternative route due to the cost
  • Fig. 5 embodiment of a branch of an alternative route from the initial route
  • Fig. 6 embodiment of a calculation of a bypassed route
  • Fig. 7 embodiment of the centrality of a waypoint candidate.
  • Fig. 1 shows common algorithms for finding the best route based on the successive expansion of connectivity. This can be done after the implementation has been chosen, starting at the place of departure until reaching the destination, vice versa from destination to the start, or from both sides until the connection is established. In any case, beyond the connection possibilities to the route ultimately found, further connection possibilities are always expanded and thus implicitly consider alternative routes. In a simple route search, the so found, additional, not cost optimal connections are discarded.
  • Alternative routes are calculated by selecting a suitable link "Signatare - Link" as a waypoint, which has an intermediate destination between the start and the destination
  • the alternative route corresponds to the best route from the start via this waypoint (intermediate destination) to the destination.
  • a preferred embodiment is to accept all the connection possibilities expanded in the initial route calculation, with the exception of those on the initial route, as the set of potential signature links. To the amount of potential signature links or to increase the waypoint candidate, it may be useful to perform in the initial route calculation more expansions than would actually be necessary to determine the best route. It is also possible to increase the set of waypoint candidates in other ways, for example by waypoints selected according to geometrical criteria.
  • the implementation further restricts the effectively used output quantity by also considering only the alternative routes that are expanded in the initial route calculation for determining the alternative routes resulting from the waypoint candidates.
  • a waypoint candidate can only create an alternative route if there is a path from the start to the destination via this waypoint in the originally expanded search space. Connections leading to a dead end in the reduced search space are discarded as the algorithm progresses.
  • the initial route calculation is done with a standard algorithm, for example A * or Dijkstra. It is irrelevant whether expansion in one direction from start to finish or vice versa or bidirectionally.
  • Fig. 2 shows the evaluation of possible alternative routes. If an intermediate destination is inserted between the start and finish, and then the best route is calculated from the start via the intermediate destination to the destination, the result is a route that differs from the original route on a specific section on which the intermediate destination lies.
  • This "Bypass" section is always present as waypoint candidates are considered only waypoints that are not on the original route, or in extreme cases, the divergent section may extend the full length of the route.
  • the route thus defined becomes obvious from the initial route differ. In doing so, she will branch off from the initial route at a position which may also be the start position and reunite with her at another point, which may be identical to the target position.
  • extended destinations such as entire streets or locations
  • an alternate route may also reach the destination at a location other than the initial route without directly meeting that route.
  • Such cases are mathematically treated in the present algorithm as a union with the initial route at the destination. Alternatively, it is also possible to exclude from the consideration waypoint candidates that would lead to the achievement of the goal elsewhere. If it is assumed or ensured that the initial and the alternative route are optimal in the context of the considered road network, there will only be one divergent section per waypoint.
  • the set of considered waypoint candidates for the waypoint results from the results of the initial route calculation. All possible connection options expanded during the initial route search but not belonging to the initial route are considered.
  • the amount is insufficient to produce the desired routes, it can be extended, for example, by performing additional expansions that are not actually necessary to determine the best route. It is also possible, independently of the initial route calculation, to select waypoint candidates, for example based on the positions of start and destination, and the course of the initial route.
  • the properties, the resulting hypothetical route are evaluated. It makes sense to choose the algorithm and the evaluation criteria in such a way that the individual routes for this must not yet be completely generated at this time.
  • the procedure includes three main criteria in the evaluation:
  • Length and relative position of the area in which the potential alternative route differs from the initial route instead of the length also related measures such as travel time, abstract route costs etc. can be used;
  • Cost of the corresponding section on the initial route Other dimensions such as distance, travel time, financial costs, etc. can be considered here.
  • FIG. 3 shows the first subcriterion for the evaluation of possible alternative routes having the resulting abstract route costs. Assuming that the initial route, as intended, is the best in terms of cost, an alternative route will have ever higher total costs.
  • the costs of the bypass on the possible alternative route and those of the bypassed section of the initial route are considered "bypassed."
  • the ratio of the costs of these route segments is included as a factor in the evaluation of the SignatureLink candidate (waypoint candidate) relative increase beyond a certain threshold, for example 25%, the potential increase can generally be ruled out as a sensible alternative.
  • the length of the diverging section should be in a "reasonable" relation to the total route, and an alternative route should not be limited to a trivial, short section from the original route, especially not in the middle part of the route. If it is not possible to bypass a long route, it will be accepted at departure and destination, but also shorter deviations, for example the choice of another motorway junction. In order not to falsely favor cumbersome routes, in evaluating the length of the deviation, only the bypassed piece on the original route is evaluated, not the bypass itself. The evaluation takes place in the implementation on the basis of the respective track lengths. However, the assessment could also be based on the route costs or other cost measures.
  • the length of the bypassed section can be evaluated firstly in relation to the total length of the initial route, and secondly in relation to the route length between the end or beginning of the bypass and the start or destination. It is used, preferably a mixture of both relations.
  • An alternative route can usually be generated identically by several possible signature links. It has been found useful if the signature link is located in the middle of the bypass it generates, especially to avoid possible artifacts that occur when the signature link is at the very beginning or end of the bypass it generates.
  • Signature link candidates get a better rating if they are as close to the center of the bypass they create.
  • FIGS. 4a and 4b show the efficient calculation of the evaluation criteria. Both as signature link candidates and as components of the Altemativroutenkandichal spanned thereby only connection possibilities are considered, which were already expanded in the possibly artificially extended initial route calculation.
  • the optimal route from the start to the respective waypoint For each signature link of these connection options, the optimal route from the start to the respective waypoint, the abstract costs of the route and, optionally, additional parameters carried along, such as the route length of the optimal route from Start, are known as a by-product of the initial route search.
  • connection options expanded in the initial route search span a subgraph of the road network including the start, destination, and at least one connection therebetween, namely the initial route.
  • FIG. 4b shows a subgraph on which a full breadth first search is performed, with the connectivity being followed in their opposite direction, but further assuming the original physical drift direction.
  • the same number of expansion steps are necessary as with the initial route search.
  • the cost per step can be considerably reduced if the costs determined per connection possibility and the respective possible transitions are stored during the initial route calculation so that database accesses and renewed cost calculations can be dispensed with for the backward expansion.
  • the Backward expansion if properly implemented, can therefore be done much faster than the initial route calculation.
  • Each expansion option expanded in this backward expansion is a Signature Link candidate for the Signature Link you are looking for. Connections to, incurred in the initial route search, dead ends are not reached by the backward expansion and thus fall away as a signature link candidate, as shown in Fig. 4b shown as dashed lines.
  • the amount of connectivity achieved and expanded in the backward expansion unless it is on the initial route is stored as a signature link candidate set, as shown in Figure 4a and 4b as non-dashed connectivity options.
  • the backward expansion provides the best available route to the destination for each expanded connection possibility, ie the path on which the waypoint was reached in the backward expansion and its costs and possibly other parameters, such as length. Since the initial route is already known, in the backward expansion for each expanded connection possibility, the point at which the route on which it was reached from the destination leaves the initial route (relative to the direction of backward expansion) can also be carried along is the point at which the bypass formed by the waypoint (relative to the direction of travel) again meets the initial route. As the cost and distance along the initial route from this point to the destination are known, the difference and cost of each signature link candidate to the corresponding "join" can also be calculated, as shown in FIG.
  • each Signature Link candidate will have its respective turn which also allows you to calculate the cost and length of the bypass up to the Signature Link candidate.
  • Bypass cost as the sum of the costs from the branch point to the signature link candidate and the cost from the signature link candidate to the join;
  • Costs of the route section driven as a difference of costs along the
  • Length of the section driven as the difference of the route lengths, along the original route from the start to the "Join” and from the start to the "Branch-off;
  • Length of the "reference length” Also a known length, along the initial route, as shown in Fig. 6.
  • Route length from signature link candidate to join route length from signature link candidate to destination minus length, along the initial route from join to destination, as shown in FIG. For each connectivity from the signature link candidate set, the three or similar criteria and their weighted product, if any, are calculated as the overall score.
  • the best rated Signature Link candidate who does not violate any exclusion criteria is chosen as the signature link for the alternative route.
  • the optimal route can be determined via this signature link. This is the first alternative route known.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Navigation (AREA)

Abstract

L'invention concerne un procédé et un système permettant de générer des propositions d'itinéraire contenant des informations sur des paramètres de sélection à partir d'une position de départ vers une position de destination sur un itinéraire initial. Sur la base d'un calcul initial d'itinéraire et des paramètres de sélection, un calcul d'au moins un itinéraire de remplacement est effectué par une sélection d'un point de trajet en tant que destination intermédiaire, et le ou les itinéraires de remplacement déterminés par le point de trajet sont différents de l'itinéraire initial sur un tronçon déterminé sur lequel se trouve le point de trajet.
EP18743007.9A 2017-08-23 2018-07-18 Procédé permettant de générer des propositions d'itinéraire de remplacement Pending EP3673238A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017214746.6A DE102017214746A1 (de) 2017-08-23 2017-08-23 Verfahren zur Erzeugung alternativer Routenvorschläge
PCT/EP2018/069480 WO2019037959A1 (fr) 2017-08-23 2018-07-18 Procédé permettant de générer des propositions d'itinéraire de remplacement

Publications (1)

Publication Number Publication Date
EP3673238A1 true EP3673238A1 (fr) 2020-07-01

Family

ID=62976064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18743007.9A Pending EP3673238A1 (fr) 2017-08-23 2018-07-18 Procédé permettant de générer des propositions d'itinéraire de remplacement

Country Status (5)

Country Link
US (1) US11320275B2 (fr)
EP (1) EP3673238A1 (fr)
JP (1) JP2020531843A (fr)
DE (1) DE102017214746A1 (fr)
WO (1) WO2019037959A1 (fr)

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Also Published As

Publication number Publication date
JP2020531843A (ja) 2020-11-05
US11320275B2 (en) 2022-05-03
WO2019037959A1 (fr) 2019-02-28
DE102017214746A1 (de) 2019-02-28
US20200249033A1 (en) 2020-08-06

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