DE102019205924A1 - Method for operating a motor vehicle, driver assistance system and motor vehicle - Google Patents

Abstract

The invention relates to a method for operating a motor vehicle (10), at least one position value (H) of a current geographical position of the motor vehicle (10) being determined, and at least one first function (F1, F2) as a function of the determined position value (H) , F3) of the motor vehicle (10) is triggered. The at least one position value (H) represents a current geographical altitude (H) of the motor vehicle (10), the current altitude (H) being determined repeatedly and the at least one first function (F1, F2, F3) being triggered as soon as the current altitude (H) reaches or exceeds a predetermined first limit value (G, G1, G2, Gmax).

Description

The invention relates to a method for operating a motor vehicle, wherein at least one position value of a current geographical position of the motor vehicle is determined and at least one first function of the motor vehicle is triggered as a function of the determined position value. The invention also includes a driver assistance system and a motor vehicle.

It is known from the prior art that the current geographical position of a motor vehicle can be determined, which is used by navigation devices for navigation purposes, for example. In addition, it is also known that the current geographical position can influence certain motor vehicle functions or their triggering, such as the output of navigational instructions.

Furthermore describes the EP 2 672 739 A1 a motor vehicle which can communicate with a mobile communication device of a user. The motor vehicle or a motor vehicle component can, for example, determine a current position of the motor vehicle, in particular its geographical position, and transmit it to the mobile communication device as a corresponding signal. Based on this current position of the motor vehicle transmitted to the mobile communication device, the mobile communication device can generate a geo-fence which can enclose the motor vehicle, for example. In particular, several such geo fences can be created around the motor vehicle that differ from one another, and certain functions of the motor vehicle can also be triggered by activation by the mobile communication device depending on the position or the direction of movement of the mobile communication device relative to these respective geo fences will. Depending on where and how the mobile communication device moves relative to these geo fences, for example the vehicle doors can be locked, the trunk opened, the heating or air conditioning activated, music selected, navigation operations carried out or similar functions triggered.

The object of the present invention is to provide a method for operating a motor vehicle, a driver assistance system and a motor vehicle that make it possible to show a further advantageous application possibility using at least one position value of a current geographical position of the motor vehicle.

This object is achieved by a method, a driver assistance system and by a motor vehicle with the features according to the respective independent claims. Advantageous configurations of the invention are the subject matter of the dependent claims, the description and the figures.

In a method according to the invention for operating a motor vehicle, at least one position value of a current geographical position of the motor vehicle is determined and at least one first function of the motor vehicle is triggered as a function of the determined position value. The at least one position value represents a current geographical altitude of the motor vehicle, the current altitude being determined repeatedly and the at least one first function being triggered as soon as the current altitude reaches or exceeds a predetermined first limit value.

The invention is based on the knowledge that especially in the case of electric vehicles, i.e. purely battery-electric vehicles and hybrid vehicles with electric drive, electronic components must be designed specifically for a maximum possible operating level due to the typically very high voltage levels in the motor vehicle. Such motor vehicles are currently designed for an operating altitude of 5,500 meters. It is assumed that there are no longer any roads above 5,500 meters in altitude, so that motor vehicles cannot drive above such a maximum operating altitude anyway. On the other hand, in most cases, that is to say by most users of such motor vehicles, the design for such a high operating altitude is not required at all. The design for such high usage heights also requires enormous effort. With higher voltages in the motor vehicle, for example, the space required for the air and creepage distances increases. For voltages in the range of 12 volts, for example, these measure around 0.001 millimeters, whereas for voltages in the range of 800 volts, they measure around 4 millimeters, which is 4000 times that. In the case of the electronic components, the usage level is included in the design of the air and creepage distances based on the IEC 60664 standard. The consideration of cosmic radiation also has a further influence. This means that the usage level has a direct influence on the component size of the electrical and electronic components. The factor of the air distance between 2,000 meters and 5,500 meters in altitude is, for example, 1.6, i.e. with a design voltage of 2.5 kilovolts, a distance of 1.5 millimeters is required at a maximum operating altitude of 2,000 meters and at an operating altitude of 5,500 meters on the other hand, a distance of 2.4 millimeters. Therefore, the design of motor vehicles for a maximum possible operating altitude of 5,500 meters has so far meant an enormous additional effort, in particular with regard to the installation space requirement in the motor vehicles, which is completely unnecessary in most cases, since a design for such high operating heights is in most cases not required anyway. On the other hand, however, it cannot currently be ensured that a user of a motor vehicle will not reach such great heights with his motor vehicle. However, if you were to limit the level of use in conventional vehicles, most users would not even be aware of the serious consequences or serious consequences of exceeding this maximum permitted level. The invention now advantageously enables at least one motor vehicle function to be triggered as soon as the current altitude, that is to say the geographical altitude, of the motor vehicle exceeds or at least reaches a predetermined limit value. In this way, various safety measures can now advantageously be initiated, for example, in the simplest case, the output of a warning message when the motor vehicle is approaching its maximum permissible operating altitude, for example. This in turn makes it possible to limit the operating altitude to significantly lower and more practical altitudes for motor vehicles, for example between 3,000 and 4,000 meters, or even less. As a result, the effort involved in designing such motor vehicles can be significantly reduced, especially when it comes to electric or hybrid vehicles, and, above all, enormous savings in installation space. The individual electrical and electronic components are also significantly more cost-effective. Since such a reduced or limited amount of use is not required by most users anyway, such a limitation does not represent a restriction for most users and is therefore not associated with any loss of comfort. However, should it happen that a user drives his vehicle to such heights close to the maximum specified deployment height, the invention can now advantageously take security measures in good time and, for example, prevent the maximum permissible deployment height from being exceeded. With this safety mechanism provided by the invention, the usage heights can now advantageously be limited, air and creepage distances can be reduced accordingly, so that components are made significantly smaller and, moreover, significantly cheaper insulation materials can be used in the high-voltage components without incurring any safety risks.

The above-mentioned position value of the current geographical position, which represents the current geographical height of the motor vehicle, is therefore at least one of three possible spatial coordinates that describe the current geographical position of the motor vehicle. This geographical height alone is decisive for triggering the at least one first function. The geographic altitude, in particular the current geographic altitude, of the motor vehicle can be provided in the motor vehicle in different ways. For example, for this purpose the motor vehicle can have an air pressure sensor which is designed to determine the current geographic altitude of the motor vehicle on the basis of the currently detected air pressure. The geographical altitude can, however, also be determined via GPS data, in particular by means of a GPS sensor of the motor vehicle, and / or be provided in advance as additional data in navigation data. In the case of a GPS-based determination of the current geographical altitude, the satellite data of several satellites, for example from two satellites, and a ground station can be used as an altitude reference in order to calculate the current position, in particular the altitude position, of the motor vehicle based thereon. In a corresponding manner, the geographic altitude can also be determined at locations where the motor vehicle is not currently located, for example if GPS sensors of other motor vehicles that are located at such locations are used to determine their current geographic altitude based thereon determine, in particular in combination with their other position coordinates, so that the geographic altitude can then also be determined for other locations, for example along a planned navigation route or the like, by other vehicles that transmit this information directly or indirectly to the motor vehicle. In other words, the current geographic altitude, as well as the geographic altitude for any other locations, in particular passable paths or roads, can also be obtained by the motor vehicle from a device external to the motor vehicle, such as a central data processing device or other motor vehicles.

The specified first limit value is preferably not the maximum operational altitude specified for the motor vehicle, but rather an altitude limit value that is lower than this operational altitude, so that appropriate measures provided by the at least one first function in good time before the maximum is reached or exceeded permissible deployment height can be triggered.

Therefore, it represents a further advantageous embodiment of the invention if the first limit value is smaller by a predetermined value than a predetermined maximum altitude limit value, which corresponds in particular to a maximum geographical altitude specified for the motor vehicle, up to a maximum to which the motor vehicle is designed to be operated. This value, by which the first limit value is smaller than this predetermined maximum height limit value, can also be selected as a function of the function to be triggered. This specified value is typically in the two or three-digit meter range. For example, this value can be 100 meters. If the maximum specified operating altitude, that is to say the maximum altitude limit, is 3,000 meters, for example, the first function is triggered when the motor vehicle reaches or exceeds an altitude of 2,900 meters. For example, a warning message can then be issued with the information that there are only 100 meters of altitude left before the maximum permissible operating altitude is exceeded. However, other measures, which are described below, can also be triggered alternatively or additionally.

It is particularly advantageous that this predetermined value, by which the first limit value is smaller than the maximum altitude limit value for which the motor vehicle is specified, can be used to provide timely triggering and initiation of measures. In particular, the driver can be prepared in good time for such measures. Particularly extreme safety measures for immobilizing the motor vehicle, for example when the maximum permissible operating altitude is reached, then do not come unprepared for the driver, or the driver can avoid such extreme measures by changing his route in good time.

• - Ein Ausgeben einer Warnmeldung an den Fahrer des Kraftfahrzeugs;
• - ein Ändern zumindest eines Betriebsparameters des Kraftfahrzeugs, in Abhängigkeit von welchem das Kraftfahrzeug betrieben wird, insbesondere ein Begrenzen einer maximalen Leistung des Kraftfahrzeugs und/oder ein Begrenzen eines Ladens eines Energiespeichers des Kraftfahrzeugs bis maximal zu einem Ladezustand des Energiespeichers, welcher kleiner ist als ein maximaler Ladezustand von 100 Prozent;
• - Berechnen einer Ausweich-Route zu einem vorgegebenen Navigationsziel derart, dass diese Ausweich-Route von der aktuellen geografischen Position bis zur geografischen Position des Navigationsziels durchgehend eine Höhe kleiner als ein vorgegebener maximaler Höhengrenzwert, insbesondere der zuvor genannte und beschriebene maximale Höhengrenzwert, aufweist.

Accordingly, it represents a further advantageous embodiment of the invention if the at least one first function represents at least one of the following functions:

• Outputting a warning message to the driver of the motor vehicle;
• Changing at least one operating parameter of the motor vehicle as a function of which the motor vehicle is operated, in particular limiting a maximum power of the motor vehicle and / or limiting charging of an energy store of the motor vehicle up to a maximum charge state of the energy store that is less than a maximum charge level of 100 percent;
• - Calculating an alternative route to a specified navigation destination such that this alternative route from the current geographical position to the geographical position of the navigation destination continuously has an altitude less than a specified maximum altitude limit value, in particular the aforementioned and described maximum altitude limit value.

Thus, for example, a warning message can be output to the driver of the motor vehicle in good time before the maximum permissible altitude limit is exceeded. This warning message can, for example, also contain the distance in the form of meters in altitude or as a route along a planned navigation route until this maximum altitude limit is exceeded. The driver can thus advantageously turn around in good time, stop or choose another route. Safety-critical situations can thus advantageously be avoided, and then probably more drastic safety measures, such as switching off the motor vehicle, in order to avoid safety risks. Operating parameters of the motor vehicle can also advantageously be adapted or changed in order to increase safety at higher altitudes, or in turn to enable a simpler and more cost-effective design of at least some motor vehicle components such as the brakes. For example, it is advantageous if the maximum power of the motor vehicle is limited. In addition, if the motor vehicle is driving downhill from a great height, for example, and the energy storage device, such as a high-voltage battery of the motor vehicle, is fully or at least almost fully charged at this point, no more recuperation energy could be absorbed by the energy storage device when driving downhill. This energy would have to be dissipated in other ways accordingly, in particular through heat, which in turn requires a larger and more robust design of the brakes of the motor vehicle. If, on the other hand, as can be provided according to this advantageous embodiment of the invention, the charging of the energy store is already limited in advance to a maximum possible state of charge less than 100 percent, for example to a value between 50% and 90%, this can be reserved when driving downhill Buffers in the energy store are used to absorb the recuperation energy, so that, as a result, the brakes of the motor vehicle can also be made smaller, since they then do not heat up as much. If the motor vehicle exceeds the specified first limit value, for example, and the user then wants to charge his energy store at a charging station, for example, the amount of charge that can be absorbed can be limited according to this maximum permissible state of charge when charging the energy store. In addition, a possible alternative route, if available, to the navigation destination specified by the user can also be automatically calculated by a navigation device of the motor vehicle when the aforementioned first limit value is exceeded. This route calculation is then carried out accordingly, taking into account the maximum possible stake amount, which is determined by the predetermined maximum altitude limit is specified. If no such alternative route can be determined, the navigation device can at least request the user to turn around or not to continue driving, since otherwise the maximum permissible operating altitude would be exceeded.

In a further advantageous embodiment of the invention, at least one second function is triggered as soon as the current altitude reaches or exceeds the specified maximum altitude limit value, in particular with a high-voltage system of the motor vehicle, in particular a high-voltage electrical system including the high-voltage battery, being automatically switched off as the at least one second function. This shutdown can take place in particular in that the high-voltage battery or the energy store of the high-voltage electrical system is decoupled from the remaining high-voltage electrical system and thus from all other high-voltage components, for example by opening the main contactors. A 12-volt on-board network of the motor vehicle, on the other hand, can continue to operate because, as mentioned at the beginning, the requirements for air and creepage distances increase extremely with increasing on-board network voltage, so that for very high altitudes these requirements for very low on-board network voltages, for example in the case of the 12-volt on-board network, they can still be implemented easily and without large installation space requirements. Accordingly, the 12-volt electrical system can also be designed for significantly greater heights than the maximum permissible operating altitude of the motor vehicle. However, before such an extreme measure can take place, numerous other warning messages can be issued to the driver. For example, such measures, as well as the measures mentioned above, can be triggered successively when this maximum altitude limit value is approached.

Accordingly, it represents a further advantageous embodiment of the invention if several different limit values, including the first limit value, are specified up to at most the maximum altitude limit value, one of several different functions, including the at least one first function, being assigned to each of the several limit values and wherein the functions assigned to the respective limit values are triggered as soon as the determined current level reaches or exceeds the respective assigned limit values. For example, such limit values can be 100 meters, 150 meters, 200 meters, 250 meters, 300 meters and so on before the maximum or below the maximum altitude limit value. When the first, that is to say the lowest, limit value is reached, a first warning can initially be output to the driver. If further higher limit values are exceeded, further warnings can be issued, alternative routes can be suggested or the operating parameters of the motor vehicle described above can be changed, and so on, until the motor vehicle, the driver should then for whatever reason the maximum permissible operating altitude and thus the maximum Exceeding the height limit value with the motor vehicle, ultimately an immobilization of the motor vehicle is triggered. These numerous measures, triggered sequentially in terms of time and space, can significantly increase the probability that the maximum permissible deployment level will not be exceeded.

Furthermore, measures can also be taken before any of the predetermined limit values is exceeded. For example, according to a further advantageous embodiment of the invention, the determined current height of the motor vehicle can be displayed on a display device of the motor vehicle. Such a display of the current height of the motor vehicle can in particular take place permanently. As a result, the user is also permanently informed about the current height of the motor vehicle. In addition, the maximum permitted altitude, i.e. the maximum altitude limit, can also be displayed. Such a display can take place, for example, on a display device of the motor vehicle, for example integrated into a navigation display. The user is then permanently informed about how close he is already getting to the maximum allowable stake. Alternatively, the determined current altitude can also only be displayed when the motor vehicle has reached a certain minimum altitude, which differs from the maximum operational altitude by, for example, 1,000 meters. This has the advantage that the driver is not irritated by the unnecessary display of the determined current altitude of the motor vehicle while driving his vehicle in very flat terrain far away from the maximum permissible operating altitude. In other words, the display of the current altitude of the motor vehicle on the display device of the motor vehicle can likewise represent one of the first functions mentioned above. If a limit value, that is to say a height limit value, is exceeded, the currently determined height of the motor vehicle is then displayed on the display device, in particular permanently, until this height limit value is undershot again. In addition, the other aforementioned measures can also be deactivated again if the relevant assigned limit value is again undershot.

In a further advantageous embodiment of the invention, it is checked for a route planned by a navigation device to a predetermined navigation destination whether the route from the current geographical position to geographic position of the navigation destination has a height less than a predetermined maximum height limit value, and if not, an alternative route can be calculated or a warning can be output to the driver. Alternatively or additionally, when planning at least one route to a given navigation destination using a navigation device of the motor vehicle, the at least one route can be determined in such a way that it continuously has an altitude less than a given maximum altitude limit value from the current geographical position to the geographical position of the navigation destination. In other words, the navigation device can, for example, only suggest routes that meet the altitude criterion described. In this way, preventive measures can already be taken when planning routes, that is to say it can be avoided from the outset that the user selects a route according to which the maximum permissible operating altitude of the motor vehicle would have to be exceeded.

The invention also relates to a driver assistance system for a motor vehicle, the driver assistance system having a control device which is designed to provide a trigger signal for triggering at least one first function of the motor vehicle as a function of at least one determined position value of a current geographical position of the motor vehicle. Furthermore, the control device is designed to compare the repeatedly determined at least one position value, which represents a current geographical altitude of the motor vehicle, with a predetermined first limit value and to provide the trigger signal as soon as the at least one position value reaches or exceeds the predetermined first limit value.

The driver assistance system can also have a position determination device, such as an air pressure sensor and / or a GPS sensor and / or a navigation device with stored map data, which is designed to determine the at least one position value, i.e. at least the current geographic altitude of the motor vehicle, to determine repeatedly, in particular continuously, and to transmit this repeatedly determined current geographical altitude to the control device for further evaluation. Furthermore, the driver assistance system can also have a memory in which the at least one predetermined first limit value is stored. This memory can also be part of the control device. Furthermore, the control device can be designed to send the trigger signal specifically to a relevant motor vehicle component, such as a display device of the motor vehicle for displaying a warning message and / or to a navigation device for determining an alternative route and / or another control device, for example a battery control device or engine control device to transmit for changing an operating parameter of the motor vehicle.

In addition, the advantages described for the method according to the invention and its configurations also apply in the same way to the driver assistance system according to the invention.

The invention also includes further developments of the driver assistance system according to the invention which have features as they have already been described in connection with the further developments of the method according to the invention. For this reason, the corresponding developments of the driver assistance system according to the invention are not described again here.

The invention also relates to a motor vehicle with a driver assistance system according to the invention or one of its configurations.

The motor vehicle is preferably only designed for operation up to a predetermined maximum geographic altitude, in particular which corresponds to the maximum altitude limit value described above.

Furthermore, the motor vehicle is preferably designed as an electric vehicle or hybrid vehicle with an electric drive. Especially in the case of electric vehicles or hybrid vehicles, which typically have vehicle electrical systems with very high voltage levels, numerous advantages can be achieved by the invention, as was described at the beginning.

The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger vehicle or truck, or as a passenger bus or motorcycle.

The invention also includes the combinations of the features of the described embodiments.

• 1 eine schematische Darstellung eines Kraftfahrzeugs mit einem Fahrerassistenzsystem gemäß einem Ausführungsbeispiel der Erfindung; und
• 2 eine schematische Darstellung einer Bergauffahrt des Kraftfahrzeugs gemäß einem Ausführungsbeispiel der Erfindung.

Exemplary embodiments of the invention are described below. This shows:

• 1 a schematic representation of a motor vehicle with a driver assistance system according to an embodiment of the invention; and
• 2 a schematic representation of an uphill drive of the motor vehicle according to an embodiment of the invention.

The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that are to be considered independently of one another and that also develop the invention independently of one another. Therefore, the disclosure is intended to include combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

In the figures, the same reference symbols denote functionally identical elements.

1 shows a schematic representation of a motor vehicle 10 with a driver assistance system 12 according to an embodiment of the invention. The driver assistance system 12 has a control device 14th on which to carry out a method for operating the motor vehicle 10 is designed according to an embodiment of the invention. The car 10 is furthermore generally only for operation up to a specified maximum geographical altitude, the maximum operating altitude, which leads to a corresponding maximum altitude limit value Gmax (cf. 2 ) corresponds, interpreted.

Motor vehicles, in particular electric or hybrid vehicles with electric drive, are typically designed for operating heights of up to 5,500 meters. It is assumed here that a motor vehicle cannot reach any higher heights anyway, since there are no more roads above these 5,500 meters. However, the design of a motor vehicle for such high operating heights requires a relatively large amount of installation space due to the necessary large dimensions of air and creepage distances, which in turn result in a very large component size of the electrical and electronic components and an expensive design of these.

The present motor vehicle 10 according to the exemplary embodiment of the invention, however, it is limited to a significantly lower operating altitude Gmax than the 5,500 vertical meters. This limited operating height Gmax of the motor vehicle 10 can for example be between 3,000 meters and 4,000 meters above sea level. As a result, electrical and electronic components can be significantly reduced in size and cost, and in the design of the vehicle electrical system 10 Save space and costs. However, in order to prevent or at least reduce the probability that this limited, predefined operating altitude, predefined by the maximum altitude limit value Gmax, is not exceeded, safety measures can now advantageously be provided if the motor vehicle is moving 10 nevertheless goes in the vicinity of this maximum height Gmax.

For this purpose, the driver assistance system 12 on the one hand, a position determination device 16 which is designed to include at least the current geographic altitude H of the motor vehicle 10 to determine, and optionally further coordinates, in particular geographical coordinates of the motor vehicle 10 . To determine the current altitude H, the position determination device 16 For example, have an air pressure sensor and / or GPS sensor, so that the current altitude H of the motor vehicle is obtained using the currently measured air pressure and / or GPS data provided by the GPS sensor 10 can be determined. This determination of the current altitude H takes place repeatedly, for example at regular time intervals or also continuously, quasi continuously. Each currently determined height value H is then determined by the position determination device 16 to the control device 14th transmitted. In a memory of the control device, not explicitly shown here 14th a limit value G is also stored, which depends on the maximum operating altitude Gmax of the motor vehicle 10 is fixed. Several such limit values G can also be stored in the memory of the control device 14th be stored, each of which is determined or will be determined depending on the maximum bet amount Gmax. This limit value G can be, for example, the maximum operating level Gmax itself, or limit values G1, G2 (cf. 2 ), which are smaller than the maximum bet amount Gmax by a predetermined amount. The control device 14th now compares each currently determined altitude value H with the at least one stored limit value G. At least one of the stored limit values G becomes the current altitude value H of the motor vehicle 10 exceeded, the control device 14th at least one function assigned to this limit value G. F1 , F2 , F3 of the motor vehicle 10 out. Such functions F1 , F2 , F3 can also all be triggered simultaneously when a predetermined limit value G is exceeded, or also successively when limit values G that differ from one another are exceeded, as described below for FIG 2 is explained in more detail. As such a function F1 , F2 , F3 can for example be a warning 18th on a display device 20th of the motor vehicle 10 are output, an operating parameter P of a component 22nd of the motor vehicle 10 be changed, an entry E in an error memory 24 of the motor vehicle 10 or other suitable safety functions are triggered. As the operating parameter P, for example, a maximum power of the Motor vehicle 10 are limited and / or charging an energy store, such as a high-voltage battery, as an example of such a component 22nd of the motor vehicle 10 , can be limited to a specified state of charge that is less than the maximum state of charge of 100 percent. As a result, a reserve buffer can advantageously be kept on the high-voltage battery, which can be used to continue charging the high-voltage battery when driving downhill through recuperation so that the energy generated through recuperation does not have to be released as heat via the brakes of the motor vehicle, which in turn reduces the brakes of the Motor vehicle 10 can be made smaller. Another possible function that is not explicitly shown here can be a navigation device of the motor vehicle 10 For example, an alternative navigation route to a navigation destination specified by the driver can also be calculated, which is designed in such a way that the maximum operating altitude Gmax does not have to be exceeded when driving on this route to the navigation destination. Can also be on the display device 20th the currently determined geographic height H of the motor vehicle 10 are displayed to the driver, for example in addition to the maximum operating altitude Gmax, which the motor vehicle 10 is assigned, so that it is permanently informed about how far it is from this maximum permissible operating level Gmax. Various other security measures are also conceivable, such as, for example, complete immobilization of the motor vehicle 10 when exceeding the maximum operating level Gmax.

2 shows a schematic representation of an uphill drive of the motor vehicle 10 according to an embodiment of the invention. The motor vehicle is in the situation currently shown 10 still below its maximum bet level Gmax. In addition, how to 1 already described, several further limit values G1, G2 in addition to the limit value, which corresponds to the maximum operating altitude Gmax, are specified and, for example, in the memory of the control device 14th filed. In the present example, the motor vehicle is running 10 now uphill and accordingly approaches a first limit value G1. The motor vehicle drives 10 further uphill and exceeds this first limit value G1, this is done by the control device 14th of the motor vehicle 10 detected and triggered a first function. As such a first function, for example, initially on the display device 20th of the motor vehicle 10 the driver now permanently the current altitude H of his motor vehicle 10 are displayed, in addition to for the motor vehicle 10 specified maximum operating height Gmax. This instructs the driver of the motor vehicle 10 advantageously already indicates that he is in a height range in which he needs for his further journey for his motor vehicle 10 should have an eye on the specified maximum operating altitude Gmax, in particular relative to its current altitude H, although this first limit value G1 is dimensioned in such a way that there is still plenty of distance, for example 1,000 vertical meters, or generally between 500 and 1,500 vertical meters, to the maximum operating altitude Gmax is given. If the driver drives his motor vehicle 10 nevertheless continues uphill and then exceeds the second limit value G2, this can again be done by the control device 14th can be determined and another function triggered. The warning message, for example, can then be used as such a further function 18th on the display device 20th are output to the driver, which also informs the driver, for example, how far he is still from the maximum permitted operating altitude Gmax. This warning message 18th can take place or be additionally supported not only on a display device, but also, for example, in acoustic and / or haptic form, by outputting a warning tone, vibration of the steering wheel or the like. For example, the warning message 18th read: "Attention, you still have 100 meters to exceed the operating altitude!". If the second limit value G2 is exceeded or if a third limit value, not explicitly shown here, is exceeded, further measures can also be taken, such as changing the operating parameters P of the motor vehicle 10 to be initiated, as already to 1 described. For example, an alternative route can also be calculated and suggested to the driver. If the driver drives his motor vehicle 10 then still further and, for example, exceeds the maximum bet amount Gmax, at least one further function can also be triggered here. For example, a warning message can also be displayed here 18th on the display device 20th are output, and / or again in haptic and / or acoustic form, which says, for example, "Warning, you have exceeded the operating level!" and thus informs the driver that the maximum permitted operating level Gmax has been exceeded. Alternatively or additionally, the operating parameters P of the motor vehicle can also be changed here 10 take place, for example, by the high-voltage electrical system is switched off by the high-voltage battery is decoupled from the remaining high-voltage electrical system, whereby the motor vehicle 10 is immobilized. In this way, even in an emergency, if the driver still exceeds the maximum operating altitude Gmax despite the previously triggered warning messages and other safety measures, such as suggesting a safe alternative route, it can be ensured that no safety-endangering operating situations can arise. However, due to the further functions triggered much earlier, the probability that a driver will not go that far or that high with his Motor vehicle 10 drives that the maximum bet amount is exceeded, advantageously be increased significantly. Thus, the maximum amount Gmax can advantageously be limited to a significantly lower value than previously usual without having to take any security risks.

Overall, the examples show how the invention can provide a limitation of the deployment height with a simultaneous warning option before the limit is exceeded, which enables a significant reduction in air and creepage distances in the design of components in the motor vehicle, thereby again making these components significantly smaller enables, and enables the use of cheaper insulation materials in the high-voltage components, so that motor vehicles, in particular electric or hybrid vehicles with electric drive, can be designed significantly more cost-effective and space-efficient.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2672739 A1 [0003]

Claims (10)

Method for operating a motor vehicle (10), wherein at least one position value (H) of a current geographical position of the motor vehicle (10) is determined, and depending on the determined position value (H) at least one first function (F1, F2, F3) of the Motor vehicle (10) is triggered, characterized in that the at least one position value (H) represents a current geographical altitude (H) of the motor vehicle (10), the current altitude (H) being determined repeatedly and the at least one first function (F1 , F2, F3) is triggered as soon as the current altitude (H) reaches or exceeds a specified first limit value (G, G1, G2, Gmax). Procedure according to Claim 1 , characterized in that the first limit value (G, G1, G2) is a predetermined value smaller than a predetermined maximum altitude limit value (Gmax), which corresponds in particular to a maximum geographical altitude (Gmax) specified for the motor vehicle (10), up to maximum for which the motor vehicle (10) is designed to be operated. Method according to one of the preceding claims, characterized in that the at least one first function (F1, F2, F3) represents at least one of the following functions (F1, F2, F3): output of a warning message (18) to the driver of the motor vehicle (10); - Changing at least one operating parameter (P) of the motor vehicle (10) as a function of which the motor vehicle (10) is operated, in particular limiting a maximum power of the motor vehicle (10) and / or limiting the charging of an energy store of the motor vehicle ( 10) up to a maximum state of charge of the energy store which is less than a maximum state of charge of 100 percent; - Calculating an alternative route to a given navigation destination in such a way that this alternative route from the current geographical position to the geographical position of the navigation destination continuously has an altitude less than a given maximum altitude limit value (Gmax). Method according to one of the Claims 2 or 3 , characterized in that at least one second function (F1, F2, F3) is triggered as soon as the current altitude (H) reaches or exceeds the specified maximum altitude limit value (Gmax), in particular where the at least one second function (F1, F2, F3) a high-voltage system of the motor vehicle (10) is automatically switched off. Method according to one of the Claims 2 to 4th , characterized in that several different limit values (G, G1, G2, Gmax), including the first limit value (G, G1, G2), are specified up to the maximum height limit value (Gmax), with one of the several limit values (G, G1, G2, Gmax) one of several different functions (F1, F2, F3), comprising the at least one first function (F1, F2, F3), is assigned, the functions assigned to the respective limit values (G1, G2, Gmax) (F1, F2, F3) are triggered as soon as the determined current altitude (H) reaches or exceeds the respective assigned limit values (G, G1, G2, Gmax). Method according to one of the preceding claims, characterized in that the determined current altitude (H) of the motor vehicle (10) is displayed on a display device (20) of the motor vehicle (10). Method according to one of the preceding claims, characterized in that - for a route planned by a navigation device to a given navigation destination, it is checked whether the route from the current geographical position to the geographical position of the navigation destination is continuously at an altitude (H) less than a given one maximum altitude limit (Gmax), and if not, a warning (18) is output; and / or - when planning at least one route by a navigation device of the motor vehicle (10) to a predetermined navigation destination, the at least one route is determined in such a way that it is continuously one height (H) smaller from the current geographical position to the geographical position of the navigation destination as a predetermined maximum altitude limit (Gmax). Driver assistance system (12) for a motor vehicle (10), the driver assistance system (12) having a control device (14) which is designed to generate a trigger signal as a function of at least one determined position value (H) of a current geographical position of the motor vehicle (10) for triggering at least one first function (F1, F2, F3) of the motor vehicle (10), characterized in that the control device (14) is designed to transmit the repeatedly determined at least one position value (H) which represents a current geographical altitude (H ) of the motor vehicle (10) to compare with a predetermined first limit value (G, G1, G2, Gmax) and to provide the trigger signal as soon as the at least one position value (H) exceeds the predetermined first limit value (G, G1, G2, Gmax) reached or exceeded. Motor vehicle (10) with a driver assistance system (12) Claim 8 . Motor vehicle (10) after Claim 9 , characterized in that the motor vehicle (10) is only designed for operation up to a predetermined maximum geographical altitude (Gmax).

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