FR2960842A1 - Electric energy managing system for vehicle i.e. electric vehicle, propelled by electric motor supplied with power by battery, has communication unit connecting system with global positioning system device to deliver information - Google Patents

Abstract

The system (1) has an indicator unit (4) that indicates an electric charge of a battery. A communication unit (3) connects the system with a global positioning system (GPS) device (2) so as to deliver information relative to a considered path to a user. The communication unit connects the system with a man-machine interface (6), where the communication unit connects the system with a thermal management module of a cab interior of the vehicle. The communication unit connects the system with an information receiver (17). An independent claim is also included for a method for controlling a vehicle propelled by an electric motor supplied with power by a battery.

Description

Valeo TFR0785 1 SYSTEM AND METHOD FOR MANAGING ELECTRICAL ENERGY AVAILABLE FOR AN ELECTRIC VEHICLE.

The technical sector of the present invention is that of vehicles powered by an electric motor powered by at least one battery. More particularly, the technical sector is that of systems or processes for managing the electrical energy available on board such a vehicle. The number of hybrid vehicles, that is to say with internal combustion engine coupled to an electric motor, or all electric, that is to say io exclusively propelled by an electric motor, is constantly increasing by the fact of the scarcity of fossil fuels that fuel vehicles equipped with internal combustion engines. These hybrid or electric vehicles have a gauge indicating the level of charge of the battery. This level of loading is theoretical and does not take into account the actual information relating to a trip. Indeed, if the journey in question is performed at night, for example, it will be necessary to supply the bulbs of the front lights, the latter coming to consume some of the electrical energy stored in the battery. This theoretical load level also does not take into account the impact of the different consumers who draw on the battery, significantly affecting battery life. An example of these consumers is the air conditioning loop implemented by an electric compressor. Another example of these consumers is an electric heater heater mounted in a ventilation system, heating and / or air conditioning of the vehicle. Finally, since this gauge indicating the level of charge does not allow the user of the vehicle to know precisely whether the level of charge of the battery propelling the vehicle enables him to make his journey, he can not therefore act on consequence in a preventive way. The object of the present invention is therefore to solve the disadvantages described above mainly by proposing a system and a method for managing the electrical energy available in a battery for powering an electric motor that propels a vehicle, said system being able to retrieve information about the journey while offering the user the opportunity to adapt its power consumption to extend the autonomy of the Valeo TFR0785 2 battery. The subject of the invention is therefore a system for managing the electric energy available for a vehicle powered by an electric motor powered by at least one battery. Said system comprises: a means for indicating the level of charge of the battery, and a communication means able to connect said system with a GPS device, so as to deliver to a user information relating to a planned route. By thus collecting the essential information relating to the route envisaged by the user via the GPS device, the management system is able to make the necessary calculations and comparisons between the journey and the energy availability of the battery so as to propose to the user a moving strategy, the latter including alternatives offered to the user for the journey. This essential information relates to the distance to be traveled, an estimate of the speed of the vehicle according to the speed limits and the time required to make the journey. According to a first characteristic of the invention, the communication means is able to connect said system with a man-machine interface. According to a second characteristic of the invention, the communication means is able to connect said system with a thermal management module of a passenger compartment of said vehicle. The communication means is able to connect said system with a receiver of information relating to the road traffic of said path and to the climatic conditions in said path. The same means of communication is able to connect said system with at least one ambient sensor of the passenger compartment of the vehicle and / or with at least one sensor of ambient conditions outside the vehicle. The system according to the invention comprises a first calculation means for evaluating the electric power consumption of the motor as a function of said path determined by the GPS device. The management system also comprises a second calculation means for evaluating the power consumption of the vehicle safety components according to said path determined by the GPS device.

Valeo TFR0785 3 The second calculation method evaluates the power consumption of vehicle safety components based on data relating to road traffic and / or the state of the climate during the envisaged journey communicated by an information receiver.

According to another characteristic of the invention, the system comprises a first means for comparing the level of electrical charge of the battery and a primary power consumption constituted by the sum of the evaluations of the electrical consumption of the engine and the safety components. According to another characteristic of the invention, the system comprises a third calculation means for evaluating the interior comfort electrical consumption as a function of said path and of a thermal need requested by the user of the vehicle. In addition, the third calculation means evaluates the electrical consumption of passenger compartment comfort according to ambient data communicated by at least one room sensor of the passenger compartment of the vehicle. The third calculation means also evaluates the passenger compartment power consumption based on data relating to road traffic and / or the state of the climate during the intended journey communicated by an information receiver. Finally, the system according to the invention comprises a second means of comparison between the level of electric charge of the battery and a secondary electrical consumption constituted by the sum of the primary electrical consumption with the evaluation of the electrical consumption 25 of passenger comfort. . The invention also covers a method of controlling a vehicle powered by an electric motor powered by at least one battery, comprising the following steps: a) introduction of a destination via a human-machine interface, b) determination of the path by means of a GPS device, c) estimation of the electrical consumption of the motor as a function of said path, d) estimation of the battery charge level, Valeo TFR0785 4 e) estimation of the electrical consumption of components vehicle safety according to said path, g) issuing information reflecting the possibility or impossibility of making the journey.

Advantageously, the method comprises a step f) comparing the charge level of the battery and a primary power consumption consisting of the sum of the electrical consumption estimates of the engine and the safety components, f) If the charge level is higher to the primary power consumption, delivery of information reflecting the possibility of making the journey, f2) If the load level is lower than the primary power consumption, issuing information reflecting the impossibility of making the journey . Advantageously, and prior to step g), the method provides for the introduction of a desired level of thermal comfort into a passenger compartment of said vehicle during the journey, and as a replacement for step f), a comparison between the level of electric charge and a secondary electrical consumption constituted by the sum of a primary electrical consumption, constituted by the sum of the electrical consumption estimates of the engine and the safety components, with an estimate of electrical consumption of passenger comfort. If the level of charge is greater than the primary power consumption, the method delivers information reflecting the possibility of making the journey (step fibis). If the charge level is lower than the primary power consumption, the method provides the user with a degraded cabin comfort level (step f2bis). According to a first characteristic of the invention, in step f2b; s), if the user accepts the gradient comfort level, it delivers information reflecting the possibility of making the journey. If trip information is delivered or the user refuses the degraded cabin comfort level, the GPS device determines an alternate path on which a battery charging station is available. Finally, a step of updating the location of the charging stations of the battery is performed by receiving data from a Valeo TFR0785 information receiver (17). The invention also covers an electric power management device available for a vehicle powered by an electric motor powered by at least one battery, comprising: a means for indicating the level of electric charge (4) of the battery, a GPS device (2), - at least one calculation means (8, 5, 9) - a communication means (3) able to connect said calculation means (8, 5, 9) with the indicator means of the charge level (4) of the battery io and with the GPS device (2). According to a first variant of this management device, the latter also comprises a man-machine interface. According to a second alternative or complementary variant of the first variant, the management device further comprises a thermal management module of a passenger compartment of said vehicle connected to at least one calculation means via the communication means. Alternatively or additionally, the device incorporates an information receiver that communicates with a calculation means via the communication means.

At least one room sensor of the passenger compartment of the vehicle and / or at least one sensor of conditions outside the vehicle are part of the management device and communicate with a means of calculation via the communication means. The management device according to the invention also comprises a first means of comparison between the level of electric charge of the battery and a primary power consumption constituted by the sum of the evaluations of the electrical consumption of the engine and the safety components. Advantageously, the management device according to the invention comprises a second means of comparison between the level of electric charge of the battery and a secondary power consumption constituted by the sum of the primary power consumption with an assessment of the comfort power consumption. cockpit. A first advantage of the invention lies in the fact that the user is informed before departure of the possibility or the impossibility of performing the Valeo TFR0785 6 journey that he envisages in an ideal or desired passenger compartment comfort condition . Another advantage lies in the fact that the user is informed of the possibility of making the planned journey subject to lowering his claims for thermal comfort inside the passenger compartment of the vehicle. Another advantage lies in the fact that the information receiver makes it possible to optimize the control of the thermal comfort as a function of the path to be traveled and according to the position of the charging station. Another significant advantage lies in the fact that the system lo offers the user an alternative path where he will be able to recharge the battery of the vehicle, the receiver of information to update regularly the existence of new charging stations. Other features, details and advantages of the invention will emerge more clearly on reading the description given below as an indication with reference to drawings in which: FIG. 1 is a schematic view of the management system of FIG. the electrical energy according to the invention, FIG 2 is a logic diagram detailing the control method of an electric vehicle according to the invention.

It should be noted that the figures show the invention in detail, said figures can of course be used to better define the invention where appropriate. FIG. 1 illustrates a management system 1 for the electric energy available for a vehicle powered by an electric motor powered by at least one battery. It may be a vehicle powered solely by an electric motor, but the invention also covers the case of hybrid vehicles, where an internal combustion engine coexists with an electric motor. The management system according to the invention is able to predict or optimize the electrical consumption of the vehicle equipment by evaluating the power consumption of certain components according to the climatic conditions surrounding the vehicle or in function of the climatic conditions to come in the path so as to adjust the operation of other components, such as the heater for example. The management system 1 consists of a computer 19 and Valeo TFR0785 7 communication means 3, the latter being able to collect or deliver data relating to the management of electrical energy available on the vehicle. The management system 1, via the communication means 3, receives at least one information from a means indicating the charge level 4 of the battery. This M7 information reflects the amount of electrical energy stored in the battery that powers the electric motor propelling the vehicle. The communication means 3 receives an information M1 coming from a human-machine interface 6, the latter being able to take the form of an interface physically fixed in a vehicle compartment of the vehicle at the level of the central console for example, but can also be an autonomous device and independent of the vehicle such as a mobile phone for example. The information M1 is an indication of a desired destination by the user of the vehicle.

The communication means 3 also receives data M2 from a GPS device 2. This data is for example the distance to be traveled between the point where the vehicle is located and the destination of arrival or desired by the user. This M2 data also includes information on the speed limits on the path so as to evaluate the travel time. An information receiver 17 between the management system 1 and the outside of the vehicle is used to collect M3 data relating to the state of the road traffic, the state of the climate on the planned route and the update information such as the presence of battery charging stations. The information on the state of the climate during the journey includes an estimate of the ambient temperature in the path and an estimate of the weather that the user may encounter on the route. The information receiver, for example, takes the form of an on-vehicle audio system and receives climate information. The audio system is therefore able to send road and / or weather data M3 by means of communication 3. Alternatively, the information receiver may be of the Wifi, GPRS or other wireless type capable of communicating with bases. external data to the vehicle. The information receiver 17 thus makes it possible to update in real time Valeo TFR0785 8 the M3 information (road traffic and battery charging station update) used by the management system 1 to calculate the power consumption of the engine or of the thermal management module 11. The management system 1 uses its communication means 3 to receive the data M3 from the information receiver 17. The management system 1 optimizes the operation of the thermal management of the engine and auxiliaries, as well as that of the thermal management module 11 (passenger compartment) as a function of the distance and the time remaining to go. Finally, the communication means 3 receives and transmits data M18 or io 18 to and from a thermal management module 11 of a passenger compartment of said vehicle, this module being a dedicated computer for managing the temperature inside the vehicle. the passenger compartment of the vehicle. This calculator can be part of an air conditioning control panel or be independent of it and controls the components of the air conditioning loop, for example the compressor, as well as the components of the ventilation, heating and / or ventilation system. air conditioning such as the electric heating radiator. The data 18 received by the communication means reflect the comfort conditions in the passenger compartment as desired by the user while the data M18 illustrate the control information sent to the thermal management module 11 to control this. latest. The M2 data in combination with the charge level information of the M7 battery is used to provide the user with information relating to the intended route and, in the first place, electrical power availability information for making the journey. Indeed, the computer 19 includes a first calculation means 8 which determines, estimates or evaluates the power consumption of the motor needed to perform the requested path. The computer 19 comprises a second calculation means 5 whose function is to evaluate the electrical power consumption of the vehicle safety components 30 as a function of said path and of data communicated by at least one sensor 15 of ambient conditions outside the vehicle. The security components in question are for example the lighting of the front lights and rear lights of the vehicle, the wiper system of the front windshield or a braking device assisted or electrically controlled. The Valeo TFR0785 9 management system 1 according to the invention takes into account these safety components because they are mandatory electrical consumers to comply with good visibility and safety conditions. The safety components also include operating components such as the electric motor cooling system or the thermal management system of the battery. These two systems comprise for example an electric coolant or coolant circulation pump and a front fan which are electrical consumers essential for the proper functioning of the vehicle. The second calculation means 5 is implemented either on receipt of the data M2 relating to the path and / or M3 relating to the road traffic and / or the state of the climate during the envisaged journey respectively from the GPS device 2 or the Information receiver 17. The second calculation means 5 also uses M6 data from at least one sensor 15 so as to determine the surrounding conditions of the vehicle. The second calculation means can of course be implemented by combining the data M2 and / or M3 with the data M6. In the case where the second calculation means 5 uses the data M2 relating to the path and / or M3 relating to the road traffic and / or the state of the climate 20 during the envisaged journey respectively from the GPS device 2 or the receiver of the information 17, the management system knows from the beginning of the journey the climatic conditions to come which makes it possible to estimate the power consumption of the safety components. In the case where the second calculation means 5 uses data M6 coming from at least one sensor 15 of the vehicle, the computer 19 iterates regularly (for example every minute) during the journey the implementation of the second means of calculation 5 so as to regularly refresh the estimate of the power consumption of the security components. The sensor 15 communicates with the second calculating means 5 via the communication means 3. This sensor 15 takes the form of a brightness sensor, so as to discern the day and the night in order to feed the vehicle lights, and / or the shape of a rain sensor, so as to detect the presence of water on the windshield and thus actuate the wipers. The computer 19 also comprises a first Valeo TFR0785 comparison means 10 between the electric charge level of the battery, as received by the charge level indicating means 4, and a primary power consumption. The latter corresponds to the sum of the electric motor consumption estimated by the first calculation means 8 with the electrical consumption estimated by the second calculation means 5, in relation to the safety components. At this stage, the management system 1 according to the invention is able to deliver information reflecting the possibility or impossibility of making the journey. This delivery is carried out by means of data M4 sent by the computer 19 to the man-machine interface 6. In the case where the estimated level of charge is greater than the primary power consumption, the data M4 takes the form of a information of possibility to make the journey. In the opposite case, that is to say when the comparison between the battery charge level and the evaluation of the primary power consumption shows a lack of electrical availability of the battery, the data M4 takes the form of a information of impossibility of making the journey, information delivered to the user via the man-machine interface 6. The management system according to the invention can be improved when the latter comprises a third calculation means 9 for evaluating the 20 comfort interior electrical consumption according to said path and a thermal need requested by the user of the vehicle. The communication means 3 receives ambient data M5 from the passenger compartment of the vehicle coming from room sensors 16 fitted to the vehicle. These sensors are for example a sun sensor, a hygrometric sensor and a temperature sensor in the passenger compartment of the vehicle. The M5 ambient data delivered by these sensors are used to control the operation of a ventilation, heating and / or air conditioning system 11 for heating or cooling the passenger compartment of the vehicle. The user makes a desired request or thermal need in the vehicle cabin. To do this, the user uses the human-machine interface 6 which sends a desired temperature data M12 to the communication means 3. The third calculation means 9 then uses this data M12 combined with the ambient data M5 to make a evaluation of the power consumption required to achieve the desired cabin comfort Valeo TFR0785 11 on the planned journey. The computer 19 of the management system 1 comprises a second comparison means 12 whose function is to compare the level of electric charge with a secondary power consumption. The latter is constituted by the sum of the estimate of the primary electrical consumption, that is to say the sum of the electric motor consumption estimated by the first calculation means 8 with the electrical consumption estimated by the second means of calculation 5 in relation to the safety components, with the passenger compartment power consumption as estimated by the third calculation means 9. If the load level is higher than the secondary power consumption, the computer 19, via the means communication 3, delivers to the man-machine interface 6 the data M4 which takes the form of a possibility of information to perform the path.

On the other hand, if the charge level is lower than the secondary power consumption, it means that the electric energy available in the battery is not sufficient to carry out the journey. At this stage, the invention proposes an alternative. In fact, the computer 19, via the communication means 3, delivers to the man-machine interface 6 a datum M11 to provide the user with a degraded interior comfort level so as to reduce the electrical consumption of the installation ventilation, heating and / or air conditioning and thus make the journey without recharging the battery. If the user accepts the degraded cabin comfort level, the computer 19, via the communication means 3, transmits information M4 reflecting the possibility of carrying out the journey. Conversely, if the user refuses the comfort level degraded comfort, the computer 19, via the communication means 3, transmits information unable to perform the path. The GPS device 2 then offers the user an alternative path on which is accessible a charging terminal 30 of the battery. The system according to the invention also informs the user of the minimum recharge time of the battery to perform the second part of the alternative path between the charging station and the destination. The information receiver 17 is also used to update the management system 1 according to the invention with the location of new recharging terminals Valeo TFR0785 12 so as to optimize in real time the alternative path proposed by the GPS device 2. The same goes for traffic information. FIG. 2 represents a logic diagram illustrating the steps of a control method of an electric vehicle, the latter being propelled by an electric motor powered by at least one battery. In step 100, the user turns on the vehicle, then in step 101 he enters the desired destination. At the same time, the user enters at a step 102 a desired level of passenger comfort during the journey, in the form of, for example, a desired temperature in the passenger compartment as well as the type of air distribution desired in the passenger compartment ( windshield aeration, central / lateral ventilation, foot ventilation, or a combination of these vents). In step 103, the GPS device 2 then determines the path between the point where the vehicle is located and the destination entered in step 101. This determination includes an evaluation of the distance to be traveled, the travel time and the distance to be traveled. 'arriving time. In step 104, the management system 1, and in particular the first calculating means 8 of the computer 19, evaluates the electrical consumption of the electric motor that propels the vehicle according to the path determined in step 103.

In step 105, the second calculation means 5 evaluates the electrical consumption of vehicle safety components as a function of said path determined by the GPS device 2, as a function of climatic or road data communicated by the information receiver 17 and or as a function of the ambient data communicated by the sensor 15 of ambient conditions outside the vehicle (data M6). In step 106, the method determines the charge level of the battery that provides electrical energy to the electric motor propelling the vehicle. In step 107, the first comparison means 13 compares the battery charge level, as received by the charge level indicator means 4, with the primary power consumption as estimated in steps 104 and 105. (sum of electric motor power consumption with power consumption of vehicle safety components). If the comparison shows that the level of charge is insufficient (reference N in step 107), the method proposes to the user during step 108 Valeo TFR0785 13 to make the journey in the desired passenger compartment comfort conditions or in a degraded mode, that is to say less consumer of electrical energy. In any case, the GPS device 2 determines the alternative path towards the desired destination but on which a charging station of the battery is accessible. This action is carried out in step 109. In step 110, the user has the possibility of validating (step 110 - reference Y) or refusing (step 110 - reference N) the alternative path. If the user agrees, the vehicle start is allowed by step 111 and if the user refuses the method is initialized by step 100 of turning on the vehicle. In step 107, if the comparison shows that the level of charge is sufficient (reference Y at step 107) to make the journey, the human-machine interface 6 informs the user of the possibility of making the journey according to step 112 At this stage of the method, step 113 implements the third calculation means 9 to evaluate the passenger compartment comfort electric consumption according to the path, a thermal need requested by the user of the vehicle and climatic and / or road conditions communicated by the information receiver 17.

Step 114 corresponds to the second comparison means 12 whose objective is to compare the level of electric charge of the battery and a secondary electrical consumption constituted by the sum of the primary electrical consumption evaluated above with the evaluation of the cabin interior electrical consumption as desired by the user 25 in step 102. If this comparison shows that the battery charge level is insufficient (step 114 - reference N), the method provides an alternative to the user in relation to the level of comfort in the cabin. This alternative is symbolized by step 115.

In this step, if the user wants to maintain the desired cabin comfort level (step 115 - reference N), the method returns to step 109 where the GPS device determines the alternative path with the presence of a charging station. the battery, the location of which has been updated using the information receiver 17 when the latter communicates Valeo TFR0785 14 climate, road and presence of charging station data at step 105. On the other hand, if the user chooses a degraded mode cabin comfort conditions (step 115 - reference Y), the management system 1 delivers to the man-machine interface 6 information reflecting the possibility of making the journey with conditions of comfort. gradient comfort (step 116), for example with a temperature in the passenger compartment lower than the desired temperature and allows starting the vehicle according to step 111. Finally, the method comprises a step 11 7 corresponding to an iteration at a minute frequency of the electric vehicle control method by measuring the climatic conditions by the room sensor (s) 16 and by the ambient condition sensor (s) 15 outside the vehicle. This iteration returns to step 103 where the GPS device 2 determines the path between the point where the vehicle is located and the destination entered in step 101.

The above method has been described in its entirety but the main steps are: a) introduction of a destination via a man-machine interface 6 corresponding to step 101, b) determination of the path to by means of a GPS device 2 corresponding to step 103, c) estimation of the electric power consumption of the motor as a function of said path corresponding to step 104, d) estimation of the charge level of the battery corresponding to the step 106, 25 e) estimation of the electrical consumption of safety components of the vehicle according to said path corresponding to step 105, g) delivery of information reflecting the possibility or the impossibility of making the journey according to one of steps 112 or 116. In addition, the method estimates the electrical consumption for the passenger compartment thermal comfort as a function of the journey and updates the journey data through the real-time knowledge of the vehicle. and update the positioning of the battery charging stations.

Claims (21)

REVENDICATIONS1. Management system (1) of the electric power available for a vehicle powered by an electric motor powered by at least one battery, said system comprises: - means for indicating the level of electric charge (4) of the battery, and - a communication means (3) adapted to connect said system (1) with a GPS device (2), so as to deliver to a user information relating to a route envisaged. 2. System according to claim 1, wherein the communication means (3) is adapted to connect said system (1) with a man-machine interface (6). 3. System according to any one of the preceding claims, wherein the communication means (3) is adapted to connect said system (1) with a thermal management module (7) of a passenger compartment of said vehicle. 4. System according to any one of the preceding claims, wherein the communication means (3) is adapted to connect said system (1) with an information receiver (17). 5. System according to any one of the preceding claims, in which the communication means (3) is able to connect said system (1) with at least one ambient sensor (16) of the passenger compartment of the vehicle. . 6. System according to any one of the preceding claims, wherein the communication means (3) is adapted to connect said system (1) with at least one sensor (15) of conditions outside the vehicle. 7. System according to any one of claims 1 to 6, which comprises a first calculation means (8) for evaluating the power consumption of the engine according to said path determined by the GPS device (2). 30 8. System according to claim 7, which comprises a second calculation means (5) for evaluating the electrical consumption of vehicle safety components as a function of said path determined by the GPS device (2). 9. System according to claim 8, wherein the second calculating means (5) evaluates the electrical consumption of safety components of the Valeo TFR0785 16 vehicle according to data (M3) relating to road traffic and / or the state of the climate. during the intended route, communicated by an information receiver (17). 10. System according to claims 8 or 9, which comprises a first comparison means (13) between the charge level (4) of the battery and a primary power consumption consisting of the sum of the ratings of electrical consumption of the engine and the security components. 11. System according to claims 8 or 9, which comprises a third calculation means (9) for evaluating the passenger compartment comfort electric consumption as a function of said path and a thermal requirement (18) requested by the user of the vehicle. 12. System according to claim 11, wherein the third calculating means (9) evaluates the interior comfort electrical consumption as a function of room data (M5) communicated by at least one room sensor (16) of the room. cabin of the vehicle. 13. System according to claim 11 or 12, wherein the third calculation means (9) evaluates the passenger compartment comfort electric consumption according to data (M3) relating to the road traffic and / or the state of the climate 20 during the envisaged route, communicated by an information receiver (17). 14. System according to any one of claims 11 to 13, which comprises a second means of comparison (12) between the electric charge level of the battery and a secondary power consumption consisting of the sum of the primary power consumption with the evaluation of the electrical consumption of cabin comfort. 15. An electric power management device available for a vehicle powered by an electric motor powered by at least one battery, comprising: a means for indicating the level of electric charge (4) of the battery, a GPS device ( 2), - at least one calculating means (8, 5, 9), - a communication means (3) adapted to connect said calculating means (8, 5, 9) with the level indicator means charging (4) battery and with GPS device (2) .Valeo TFR0785 17 16. A method of controlling a vehicle powered by an electric motor powered by at least one battery, comprising the following steps: a) introduction of a destination (M1) via a human-machine interface (6) ), b) determination of the path (M2) by means of a GPS device (2), c) estimation of the electric power consumption of the motor as a function of the said path (M2), d) estimation of the charge level of the battery, e) estimating the power consumption of vehicle safety components according to said path (M2), g) delivering information (M4) reflecting the possibility or impossibility of making the path (M2). The method of claim 16, comprising a step f) comparing the battery charge level with a primary power consumption of the sum of the power consumption estimates of the engine and the security components. load level is greater than the primary power consumption, delivery of information (M4) reflecting the possibility of making the journey, f2) If the load level is lower than the primary power consumption, issuing information (M4) ) reflecting the impossibility of making the journey. The method of claim 17, comprising the steps of: a) prior to step g), introducing a desired thermal comfort level (18) into a passenger compartment of said vehicle during the journey, 30 fb; s) replacing step f), comparison between the level of electric charge and a secondary electrical consumption constituted by the sum of a primary electrical consumption, constituted by the sum of the estimates of the electrical consumption of the engine and the safety components, with an estimate of the electrical consumption of passenger compartment comfort, Valeo TFR0785 18 fibis) If the load level is higher than the primary power consumption, delivery of information (M4) reflecting the possibility of making the journey, f2bis). load is lower than the primary power consumption, proposal of a gradient cabin comfort level (M11). 19. The method of claim 18, wherein in step f2bis), - if the user accepts the gradient comfort comfort level (M11), issuing information (M4) reflecting the possibility of making the journey. 20. A method according to any one of claims 16 to 19, in which, if information of impossibility to make the journey is delivered or if the user refuses the level of comfort gradient cabin, the device GPS (2) determines an alternate path on which a battery charging station is available. 21. A method according to any one of claims 16 to 20, wherein updating the location of the battery charging terminals is effected by receiving data from an information receiver (17).