SE537598C2 - Method and system for organizing vehicle trains - Google Patents

Abstract

Summary A system and method may organize a vehicle roof. The system comprises a processor unit which is configured to determine a ratio bx for a vehicle, for example, which does not want any in the vehicle tie which describes the ratio between the vehicle's maximum engine power and vehicle mass or the ratio between the vehicle's maximum engine torque and vehicle mass, cf. at least one other ratio bk for a vehicle fk in the vehicle stay which describes the ratio between the vehicle fk's maximum engine power and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass, and determine a location for the vehicle eg in the vehicle stay based on the result of the comparison. The system is further configured to generate a location signal indicating the location of the vehicle eg and the true location signal to an indicator unit in the vehicle e.g., the location of the vehicle f being indicated to the driver of the vehicle e.g.

Description

FIELD OF THE INVENTION The present invention relates to a system and a method for organizing a vehicle roof. In particular, it is stated that a vehicle roof can be organized before regulation of the vehicles.

Background of the Invention The traffic intensity is high on Europe's major roads and is expected to increase in the future.

The increased transport of people and goods not only gives rise to traffic problems in the form of cows but also requires more energy, which in the end gives rise to emissions of greenhouse gases, for example. A possible way to solve these problems is to let lazy vehicles travel in so-called platoons. By vehicle roof is meant a number of vehicles that cross at short distances between each other and drive forward as a unit. The short distances lead to more and more traffic being able to travel on the road, and also all the energy consumption for an individual vehicle decreases as the air resistance is reduced. The vehicles in the vehicle roof are [(equipped with an automated control for the vehicle's speed and / or steering wheel steering. Della entails vehicle drivers as truck drivers are relieved, accidents based on incorrect manpower decisions are reduced and fuel consumption can be reduced. Studies show that fuel consumption can be reduced in the leading vehicle with 2 to 10% and for the following vehicle 15 to 20% compared to a single vehicle. Assuming all the distance between the trucks is 8 - 16 meters and even they travel at 80 km / h. The reduced fuel consumption gives a corresponding reduction in CO2 emissions.

Drivers are already taking advantage of this elusive fact today with a sacred traffic safety as a result. A fundamental question about vehicle stays is how the time slot between vehicles can be reduced from the recommended 3 seconds down to between 0.5 and 1 second without affecting road safety. With distance sensors and cameras, the driver's reaction time can be eliminated, a type of technology already used today by systems such as ACC (Adaptive Cruise Control) and LKA (Lane Keeping Assistance). 1 A limitation, however, is that distance sensors and cameras require a clear view of the target, which makes it difficult to detect trades more than a couple of vehicles up front in Icon. A further limitation is that cruise control cannot react proactively, i.e. the cruise control cannot react to actions that take place further in the traffic that will affect the traffic rhythm.

One way to get vehicles to act proactively is to get vehicles to communicate and exchange information. A development of the IEEE standard 802.11 for WLAN (Wireless Local Area Networks) called 802.11p enables wireless transmission of information between vehicles, and between vehicles and infrastructure. Different types of information can be sanded to and from the vehicles, such as vehicle parameters and strategies. The development of communication technology has made it possible to design vehicles and infrastructure that can interact and act proactively. Vehicles can be regulated as a unit and consequently shorter distances and a better global traffic flow are possible.

Many vehicles today are also equipped with a cruise control to make it easier for Waren to drive the vehicle. The desired speed can then be set by the driver through, for example, a control in the steering console, and a cruise control system in the vehicle then acts on a control system so that it accelerates or brakes the vehicle to maintain the desired speed. If the vehicle is equipped with an automatic shifting system, the other person's the vehicle's gearbox so that the vehicle can maintain the desired speed.

When cruise control is used in hilly terrain, the cruise control system will try to maintain the set speed through uphill slopes. This sometimes results in all the vehicle accelerating over the crown and perhaps into a subsequent downhill slope and then having to be braked so as not to exceed the set speed, which constitutes an industry-free way of driving the vehicle. By varying the vehicle's speed in hilly terrain, fuel can be saved at the same time as a conventional cruise control. If the future topology is known because the vehicle has map data and positioning equipment, such systems can be more robust and also the speed of 2 other vehicles before things have happened, which is achieved with so-called predictive cruise control (LAC).

However, as an industry-optimal crossover strategy must be developed for an entire vehicle roof, the situation becomes more complex. Additional aspects must be taken into account, such as maintaining the optimal distance, physically possible speed profile for all vehicles with varying mass and engine capacity. A further aspect of a vehicle roof during travel with varying topography is that once the first vehicle has lost speed on an uphill slope, it resumes its seat speed along the hill. The subsequent vehicles that are then still on the uphill slope will all be forced to accelerate on the hill, which is not industry efficient. It is also not always possible, which meant that gaps will be created in the vehicle roof, which in turn must be dropped again. Della creates oscillations in the vehicle stay. Similar behavior is also observed under downhill slopes, when the first vehicle begins to accelerate on the downhill slope due to the great mass. The following vehicles are then forced to accelerate before the downhill slope, as they try to maintain the distance to the vehicle in front. After the downhill, the leader vehicle begins to decelerate to return to the set speed. The subsequent vehicles, which are still on the downhill slope, will then be forced to brake so as not to cause a collision, which is not industry efficient.

WO-2012105889-Al mentions that a heavy vehicle traveling down a hill behind a lighter vehicle will often approach the latter and must be braked. It is described that the correct choice of time interval or the correct positioning of the vehicles in the vehicle roof before the downhill slope can possibly begin to avoid this deceleration and consequently reduce the fuel consumption.

However, there is still a lack of a general solution on how a vehicle roof should be organized for all clear both uphill and downhill slopes with the same order of the vehicles included in the vehicle roof in an industry-efficient manner. The object of the invention is to provide an improved method for organizing by vehicle roof so that the vehicle roof can be driven in an industry-efficient manner in varying topography.

SUMMARY OF THE INVENTION According to one aspect, the object described above is achieved at least in part by a method for organizing a vehicle roof. The method includes determining a ratio bx for eft vehicle eg which does not want any in the vehicle roof which describes the ratio between the vehicle fx's maximum engine power and vehicle mass or the ratio between the vehicle fx:'s maximum engine torque and vehicle mass; compare the ratio bx with at least one other ratio bk for a vehicle fk in the vehicle roof, which describes the ratio between the vehicle fk's maximum engine power and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass; determine a location for the vehicle eg in the vehicle roof based on the result of the comparison; generate a location signal indicating the location of the vehicle e.g.; the location signal to an indicating unit in the vehicle e.g., wherein the location of the vehicle e.g. is indicated by the driver of the vehicle e.g.

By calculating a ratio that describes the ratio between the vehicle's maximum engine power and the vehicle's mass or alternatively between the vehicle's maximum engine torque and vehicle mass, one can determine the most limited vehicle. The most limited vehicle is the vehicle that gets the most speed variations as it has to go up and down a hill, respectively. By placing the most limited vehicle first in the vehicle roof, and placing the second most limited thereafter, etc., one can be things on all the vehicles after the first vehicle will be able to cope with the speed variations that the first vehicle will all Ora. This meant that used vehicles will often be able to maintain the same speed as the first vehicle on an uphill slope. Delia then becomes industry-optimal, as the distance between the vehicles can be maintained throughout the journey, which gives maximum air resistance reduction and thereby the lowest fuel consumption. Delia also meant that no vehicle in the vehicle roof will often be forced to brake as the first vehicle accelerates at, for example, free roll 4 or engine braking when driving over a downhill slope. Della becomes cla industry optimal, as unreasonable braking is avoided.

According to a second aspect, the object is achieved at least in part by a system for organizing a vehicle roof. The system comprises a processor unit which is configured to determine a ratio bx for a vehicle, for example, which does not want any in the vehicle tie which describes the ratio between the vehicle's maximum engine power and vehicle mass or the ratio between the vehicle's maximum engine torque and vehicle mass, compare the ratio bx with at least another ratio bk for a vehicle fk in the vehicle tie which describes the relationship between the vehicle fk's maximum engine power and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass, and determine a location for the vehicle in the vehicle tie based on the result of the comparison. The system is further configured to generate a location signal indicating the location of the vehicle f and the true location signal to an indicator unit in the vehicle e.g., the location of the vehicle e.g. being indicated to the driver of the vehicle e.g.

The invention is particularly advantageous to use as a common crossover strategy is to be used for the entire vehicle stay. Many heavy calculations can be avoided while driving by having organized the vehicle roof in advance. All vehicles can easily follow the determined vehicle profile of the first vehicle and achieve industry optimality, as the most limited vehicle dictates the industry-optimal crew profile. This system will then also be robust (string stable), as all possible faults will be evaporated as the subsequent vehicles will always have a faster dynamics and thus be able to react more quickly to changes than the vehicle drives.

The steering strategy can, for example, mean that all the vehicles in the vehicle stay must join one of the vehicles in the vehicle stay's protruding body profile. If the vehicles in the vehicle roof are organized according to the invention, it is only necessary to determine the carcass profile of the leader vehicle, ie the carcass profile of the first vehicle, and it is not necessary to take into account the vehicle behind due to their faster dynamics. Delta meant, for example, that no crane profiles need to be sent between the vehicles, but the vehicles behind need only position-follow the forward vehicle.

A further advantage of organizing the vehicles according to the invention is that the vehicle roof becomes more robust, since the organization of the vehicles behind it always has the possibility of adapting physically to the vehicle in front, i.e. no physical restrictions on vehicles will create problems with regulation.

According to a third aspect, the purpose is achieved at least in part by a computer program P in a system, where said computer program P includes program code for causing the system to perform some of the method steps described.

According to a fourth aspect, the object is achieved at least in part by a computer program product comprising a program code stored on a computer-readable medium for performing some of the method steps described.

Preferred embodiments are described in the dependent claims and in the detailed description.

Brief Description of the Attached Figures The invention will be described below with reference to the accompanying figures, of which: Fig. 1 illustrates a vehicle roof ascending a hill.

Fig. 2 shows an example of a vehicle in the vehicle roof.

Fig. 3 shows a system according to an embodiment of the invention.

Fig. 4 shows a flow chart for a method for organizing vehicle roofs. Figs. 5A-5C show an organizational scenario.

Fig. 6 shows a further organizational scenario.

Detailed Description of Preferred Embodiments of the Invention Definitions vk: the speed of the vehicle fk in a vehicle stay with N vehicles. 6 dk, k + 1 - the distance between the vehicle fk and the vehicle behind fk + in the vehicle stay. ak: the slope father vehicle fk.

V2V (Vehicle to vehicle) communication: Wireless communication between vehicles, also called vehicle-to-vehicle communication.

V21 communication (Vehicle to infrastructure): TradlO's communication between vehicle and infrastructure, for example carriage or computer system.

Fig. 1 shows a vehicle stay with N heavy vehicles fk which travels at small intervals dk, k + 1 between the vehicles up a hill. The inclination of the vehicle when it is uphill is shown as ak. Each vehicle is equipped with a receiver and transmitter for wireless signals, shown in part by an antenna. The vehicles fk in the vehicle stay can thus communicate with each other through V2V communication or other means such as through mobile communication units, via an application in a communication unit or via a server, and to infrastructure in the form of V21 communication. The communication can, for example, go from one vehicle and via a car node to another vehicle. The different vehicles fk have different masses mk. The vehicle roof has a leader vehicle, i.e. the first vehicle f1. Each vehicle fk in the vehicle roof has, for example, a unique vehicle identity, and a vehicle roof identity that is common to the entire vehicle roof, in order to be able to keep track of which vehicles are in the vehicle roof. Data sent wirelessly between the vehicles in the vehicle stay can be tagged with these identities so all data received can be routed to rail vehicles.

Fig. 2 shows an example of a vehicle fk in the vehicle roof and how it can be equipped. The vehicle fk is provided with a positioning unit 5 which can determine the position of the vehicle fk. The positioning unit 5 can, for example, be configured to receive all signals from a global positioning system GNSS (Global Navigation Satellite System), for example GPS (Global Positioning System), GLONASS, Galileo or Compass. Alternatively, the positioning unit 5 may be configured to receive signals from, for example, one or more detectors in the vehicle which feed relative distances to, for example, a car node, vehicles in the vicinity or the like 7 with a known position. Based on the relative distances, the positioning unit 5 can then determine the vehicle fk's own position. A detector can also be configured to detect a signature in, for example, a car node, the signature representing a certain position. The positioning unit 5 can then be configured to determine its position by scanning the signature. The positioning unit 5 can instead be configured to determine the signal strength in one or more signals from several base stations and / or car nodes etc. with a known position, and thereby determine the position of the vehicle fk by triangulation. On such a sail, fk's own position can be determined. Of course, the above techniques can also be combined to secure the position of the vehicle fk. The positioning unit 5 is configured to generate a position signal containing the position of the vehicle fk, and to transmit it to one or more units in the vehicle fk. As already mentioned, the vehicle fk is also equipped with a unit 4 for wireless communication. The unit 4 is configured to act as a receiver and transmitter of wireless signals.

The unit 4 can receive wireless signals from other vehicles and / or wireless signals from the infrastructure around the vehicle fk, and true wireless signals to other vehicles and / or wireless signals to the infrastructure around the vehicle fk. The wireless signals can also include vehicle parameters from other vehicles, such as mass, torque, maximum engine power, speed, and even more complex information such as gallbladder profile, crossover strategy, etc. The wireless signals can also contain information about the environment, such as car slope a, curve radius r etc. The vehicle fk may also be provided with one or more detectors 8 for sensing the environment, for example a radar unit, laser unit, tilt feeder, acceleration feeder, steering angle feeder, a gyro etc. A detector unit is configured to detect a parameter, for example a relative distance, speed , slope, lateral acceleration, rotation, steering angle, etc., and aft generate a detector signal containing the parameter. The detector unit is further configured by the true detector signal to one or more units in the vehicle fk. The vehicle fk can also be equipped with a map unit that can provide map information about the upcoming road. The map unit can, for example, be part of the positioning unit 5. The driver can, for example, enter an end position and the map unit can then, by knowing the current position of the vehicle, provide relevant map data about the coming road between the current position and the final destination.

The vehicle fk communicates internally between its various units through, for example, a bus, for example a CAN bus (Controller Area Network) which uses a message-based protocol. Examples of other communication protocols that can be used are UP (Time-Triggered Protocol), Flexray and others. On that sail, signals and data described above can be exchanged between different units in the vehicle fk.

Signals and data can, for example, instead be transmitted wirelessly between the various units.

Fig. 2 also shows a processor unit 2, which is part of a system 1 according to the invention. Fig. 3 shows this system 1 according to an embodiment, which will now all be explained with reference to this figure. As shown in the figure, the processor unit 2 is connected to a memory unit 3. The memory unit 3 may comprise a volatile and / or a non-volatile memory, for example flash memory or RAM (Random Access Memory). A program P is stored on the memory unit 3. The program P includes program code for all the processor unit 2 all perform a method for all organize the vehicle stay which will all be explained in the following.

The processor unit 2 is thus configured to perform the various method steps that will be described. The program P can also be stored on a computer program product on a computer readable medium as a program code. The processor unit 2 can be constituted by one or more CPUs (Central Processing Unit). The processor unit 2 may be part of a computer or computer system, for example an ECU (Electronic Control Unit) in a vehicle fk. Alternatively, the system 1 with the processor unit 2 can be located in the infrastructure in, for example, a carriage node or central unit 7 (Figs. 5A-6).

The unit 4 for wireless communication can receive data galloning vehicle mass 30 and maximum engine power for each vehicle fk. The processor unit 2 is configured to generate a location signal indicating a location of the vehicle eg and the true location signal to an indicator unit 6 in the vehicle e.g., 9 wherein the location of the vehicle e.g. is indicated to the driver of the vehicle e.g. The driver of the vehicle then knows what place he should have in the vehicle roof and can place himself in the raft position at a time. The placement signal can also be sent to a vehicle fk or several of the other vehicles in the vehicle stay so that they prepare space for the vehicle, for example, either by the drivers manually regulating the vehicles so that a gap is opened between the vehicles, or by automatic regulation of the vehicles in the vehicle stay.

Fig. 4 shows a flow chart of the method of organizing the vehicle stay, and the method will now all be explained with reference to this figure.

The processor unit 2 (Fig. 2) is thus configured to perform this method according to the different embodiments of the method. The method comprises determining a ratio for a vehicle, for example, which does not want any in the vehicle roof which describes the ratio between the vehicle's maximum engine power and vehicle mass or the ratio between the vehicle's maximum engine torque and vehicle mass (A1). The ratio is then compared with at least one other ratio fk a vehicle fk in the vehicle stay, which describes the ratio between the vehicle fk's maximum engine power and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass (A2). According to one embodiment, the method comprises all determining the ratio b of the vehicle f and the ratio bk of the vehicle fk by calculating the maximum engine power of the vehicle the mass of the vehicle for each vehicle. Alternatively, the ratio bx for the vehicle, for example, and the ratio bk for the vehicle fk by all calculated Maximum engine torque for the vehicle for the vehicle's moss The quotas bx and bk to be compared with each other are thus both determined by either equation (1) or equation (2). The ratio gives a measure of how limited the vehicle is, ie how black it is, all Walla has a certain speed on an uphill slope. The most limited vehicle is the vehicle that has the greatest speed variations as it has to go up and down a hill, respectively. That which has added quota of the vehicles has thus been answered by Ora both parts. The maximum engine power and the maximum engine torque used by vehicles are a known engine parameter. The mass of each vehicle is also a familiar parameter used for vehicles that are, however, updated when the load is different. The respective parameters of each vehicle are accessible via the internal network of each vehicle. The parameters can be sent to system 1 via V2V or V2I. By tagging the parameters with vehicle identity and vehicle stay identity, for example, you can keep track of which parameter UM & which vehicle. The method further comprises determining a location for the vehicle, for example in the vehicle roof, based on the result of the comparison (A3). According to one embodiment, a location in front of the vehicle is determined if bx <bk, and a location behind the vehicle fk if bk bk. In this way, the vehicle can, for example, be arranged in the vehicle roof according to its quota, which indicates how limited it is. The vehicle, for example, is thus placed in the vehicle stay, so that it is placed after the vehicle or vehicles that are but limited by the vehicle, for example itself, but before that or those that are less limited. The location of the vehicle, for example, is then indicated for the vehicle, for example (A4).

According to one embodiment, the place for the vehicle is prepared, for example, in the vehicle roof according to the designated location in the vehicle roof. Della can, for example, be carried out through all one or more vehicles in the vehicle stay, knowing that the vehicle, for example, is to be placed in the vehicle stay in the designated location. These vehicles can then be adjusted manually or automatically so that a gap is created where the vehicle is to be placed, for example. The driver of the vehicle, for example, can then steer the vehicle, for example, into the door. Alternatively, the vehicle can, for example, be automatically adjusted so that it is placed in the door.

Figures 5A-5C show a scenario for sorting a vehicle, eg into an existing vehicle roof. Fig. 5A shows, for example, those who want none in the existing vehicle tie which comprises the three vehicles f1, f2 and f3. The vehicle, for example, is cut at an exit and the existing vehicle roof Icor on the road that the vehicle, for example, is to drive into. The vehicle, for example, can scan the surroundings for vehicle stays and send out a request 11 in the vehicle stay to a suitable vehicle stay. Alternatively, this can be handled by a central unit 7 which receives signals from the vehicles and then organizes suitable vehicle stays where possible. Placement signals etc. can then be sent to the vehicles from the central unit 7 to organize the vehicle stay. The central unit 7 then comprises all or parts of the system 1. Alternatively, the system 1 may be arranged in one or more of the vehicles in the vehicle stay, for example the conductor vehicle f1, or in the vehicle e.g. 'If the vehicle, for example, is allowed to have no one in the vehicle stay, the vehicle f),'s quota will be determined, if it is not already determined. Then the janitor's quota bx with the leader vehicle fi's quota b1. In this case, bx is larger than b1, and the vehicle, for example, must therefore be placed behind the conductor vehicle fi. Then the quotient bx is compared with the quotient b2 for the next vehicle f2 in the vehicle roof. In this case, bx is smaller than b2, and the vehicle, for example, must be placed in front of the vehicle f2. The quota bx the vehicle, for example, is thus compared consecutively with the quotas bk for the vehicles fk in the vehicle roof. The comparisons continue until a vehicle has been found that the vehicle, for example, is to stand in front of, or until there are no more vehicles in the drawbar. The vehicle, for example, may then be placed last in the vehicle roof. The result is that all the vehicle, for example, must be placed between the vehicles f1 and f2. The location is assigned to the driver of the vehicle e.g. This can then take a stand if it does not want anyone in the vehicle stay. The location can also be assigned to one or more vehicles in the vehicle stay. Fig. 5B shows how the vehicles in the vehicle stay open up a gap between the vehicles f1 and f2 through all the Oka distance d1,2 between the vehicles. For all incidentals Increase the distance between the vehicles, the vehicles can be speed controlled manually, or automatically from behind or more of the vehicles in the vehicle stay or from central unit 7. The vehicle eg Icor then into the hatch created as shown in Fig. 5C, and then enters the vehicle stay.

Fig. 6 shows another organizational scenario in which a plurality of vehicles f1-f4 first find themselves disorganized at, for example, a rest area or a haulage company. For all organizing after vehicle take-off of the vehicles f1-f4, the respective quotient of the vehicles is determined according to equation (1), and compared with each other for all determining the quotient that is lowest and thus indicates the most limited vehicle. Then the vehicle with the next lowest quota, etc. is placed. The locations are indicated for the vehicles in question, which are installed at their respective places at a time. For example, you can appoint vehicles fk 12 to aft none in the vehicle roof, and the other vehicles may line up in the vehicle roof based on its quota bk.

An organized vehicle roof is an advantage as a common control strategy must be applied to the vehicles in the vehicle roof. For example, the vehicles in the drawbar can then act according to a LAP (Look-Ahead cruise control for platoons) cruise control, which is a cooperative cruise control that uses information about the topography of the oncoming vehicle and calculates an optimal speed trajectory for all vehicles in the drawbar. Kailas also predictive cruise control for vehicle roofs. The control strategy is determined, for example, by dynamic programming. An LAP can, for example, use one or more projected trajectories from the LAC (Look-Ahead cruise control) cruise control, which is a carrier that uses information about the topography of the oncoming lane and calculates an optimal body profile in the form of a speed trajectory for a vehicle. . KaIlas is also a predictive speedster. If a vehicle roof is organized so that the leader vehicle is the most limited vehicle, etc., then the subsequent vehicles can follow the determined speed trajectory for the leader vehicle. PA sA sat achieved an optimized cruise control for the entire vehicle stay regarding industry use and time.

The present invention is not limited to the embodiments described above. Various alternatives, modifications and equivalents can be used. Therefore, the above-mentioned embodiments do not limit the scope of the invention, which is defined by the appended claims. 13

Claims (12)

Patent claims A method may aft organize a vehicle strut, the method comprising aft - determining a ratio bx of a vehicle fx which desires none in the vehicle strut 5 which describes the relationship between the vehicle fx's maximum engine power and vehicle mass or the ratio between the vehicle fx's maximum engine torque and vehicle mass; - compare the ratio bx with at least one other ratio bk for a vehicle fk vehicle tie which describes the ratio between the vehicle fk's maximum engine power 10 and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass; determine a location for the vehicle eg in the vehicle roof based on the result of the comparison, - generate a location signal indicating the location of the vehicle eg; send the location signal to an indicating unit (6) in the vehicle, for example, the location of the vehicle, for example, being indicated to the driver of the vehicle, for example. 20 The method according to claim 1, which comprises determining the quotient bx for the vehicle, for example, and the quotient bk for the vehicle fk by calculating the maximum engine power for the vehicle for the respective vehicle, and the mass of the vehicle, respectively. The method according to claim 2, which comprises determining a location in front of the vehicle fk if bx <bk, and a location behind the vehicle fk ifs II bx bk. The method according to any one of the preceding claims, which comprises preparing a place for the vehicle, for example in the vehicle roof according to the designated location in the vehicle roof. vehicle mass Maximum engine torque for the vehicle for each vehicle. 14 The method according to any of the preceding claims, which comprises consecutively comparing the ratio bx for the vehicle f with the quotas bk for the vehicles fk in the vehicle roof. System (1) for organizing a vehicle roof, characterized by the aft system (1) comprises a processor unit (2) which is configured aft - determine a ratio bx for eft vehicle eg which does not want any in the vehicle roof which describes the relationship between the vehicle eg: s maximum engine power and vehicle mass or the ratio between the vehicle eg maximum engine torque and vehicle mass; - compare the ratio bx with at least one other ratio bk for eft vehicle fk vehicle tie which describes the ratio between the vehicle fk's maximum engine power and vehicle mass and the ratio between the vehicle fk's maximum engine torque and vehicle mass; - determine a location for the vehicle eg in the vehicle roof based on the result of the comparison; 1. generate a location signal indicating the location of the vehicle e.g.; 2. the location signal to an indicating unit (6) in the vehicle e.g., wherein the location of the vehicle e.g. is indicated by the driver of the vehicle e.g. The system (1) according to claim 6, wherein the processor unit (2) is configured to determine the ratio bx for the vehicle fx and the ratio bk for the vehicle fk Maximum engine power for the vehicle by calculating for each vehicle, respectively for the vehicle mass Maximum engine torque f Or f the vehicle father respective vehicle. f ordonets mass The system (1) according to claim 7, wherein the processor unit (2) is configured to determine a location in front of the vehicle fk if bx <bk, and a location behind the vehicle fk if b. Bk. The system (1) according to any one of claims 6 to 8, wherein the processor unit (2) is configured to send the location signal to at least one vehicle fk in the vehicle stay, after which space is prepared for the vehicle eg in the vehicle stay according to the designated location in the vehicle stay. The system (1) according to any one of claims 6 to 9, wherein the processor unit (2) is configured to consecutively compare the ratio IN for the vehicle, for example with the quotas bk for the vehicles fk in the vehicle stay. A computer program, P, in a system (4), wherein said computer program, P, comprises program code for performing the processor unit (2) to perform some of the steps according to claims 1 to 11. 5. A computer program product comprising a program code stored on a computer readable medium for performing all the method steps according to any one of claims 1 to 5. 16 1/4