FR2973766B1 - METHOD AND DEVICE FOR POWER MANAGEMENT OF A VEHICLE WITH AN ELECTRIC MOTOR - Google Patents

Abstract

A method (300) for managing energy in an electrically driven motor vehicle (100) having a power source (120) supplying power and an electric drive (115). According to the method: - the energy received by the drive is determined (310), - the energy received by at least one other electrical consumer (150, 155) on board the vehicle (100) is determined, - potential energy savings are determined (330, 335) by the drive (115) and at least one other electrical consumer (150, 155), and - (345) an indication of potential savings at the driver of the vehicle (100).

Description

Field of the invention

The present invention relates to a method of energy management in an electrically driven motor vehicle comprising an electric power source and an electric drive powered from the power source. The invention also relates to a power management device of an electric drive motor vehicle equipped with a source of electrical energy and an electric drive powered from this source of electrical energy.

State of the art

As is known, a motor vehicle has a limited energy reserve even if it is rechargeable and this reserve must be managed appropriately for the economic operation of the vehicle and to enable it to reach a planned destination without incident.

The document EP 2 091 127 A1 describes an energy management technique on board a motor vehicle equipped with an internal combustion engine and an auxiliary electrical system supplying the electrical energy necessary for the internal combustion engine and for recharging the battery. The electrical energy taken from the battery will thus be increased or decreased depending on whether the electric auxiliary system can operate without difficulty.

DE 10 2008 028 561 A1 discloses a method of indicating to the driver of a motor vehicle how to influence the vehicle to save a certain amount of energy.

DE 10 2006 062 584 A1 discloses a technique according to which an electric energy accumulator used to drive the vehicle is loaded or emptied according to a predicted path of the vehicle.

DE 10 2008 028 561 A1 describes a method displaying the characteristic energy received by electrical consumers on board a vehicle with recommendations for reducing the respective energy intake and displaying this information for the driver.

In electric drive vehicles, the electrical energy received by all vehicle components from a power source depends on a large number of parameters. A complete representation of the possible treatment options for managing the energy users on board the motor vehicle may require a large number of display means which excessively solicit the driver of the vehicle which, if necessary, can no longer concentrate. enough on the driving of the vehicle. On the other hand, an automatic activation or neutralization of certain electrical users of the vehicle, may be perceived as unpleasant.

Purpose of the invention

The object of the present invention is to develop a method and a device enabling the driver to modify characteristic parameters of users or consumers of electrical energy according to his own considerations in order to make the best use of the available electrical energy.

DESCRIPTION AND ADVANTAGES OF THE INVENTION To this end, the subject of the invention is a method for managing energy in an electric drive motor vehicle comprising a source of electrical energy and an electric drive powered from the source of power. energy, this method being characterized by the following steps: - determining the energy received by the electric drive from the power source, - determining the energy received by at least one other electrical consumer on board the vehicle from the energy source, - determine potential savings in electrical energy from the drive and at least one other electrical consumer, and - provide an indication of potential savings to the driver of the vehicle.

In other words, the energy management method according to the invention in an electric drive vehicle equipped with a source of electrical energy and an electric drive powered from the source, consists in determining the received energy (i.e. energy taken) by the electrical drive from the power source, to determine the energy intake by at least one other electrical consumer on board the vehicle from the energy source, to determine potential savings in electrical energy from the drive and by at least one other consumer and to provide an indication of potential savings identified for the driver of the vehicle. The invention allows the driver to decide whether he wishes to save electrical energy by changing his driving mode so that overall the drive consumes less power from the power source or cut one or more other electrical consumers or reduce their operation to save electrical energy. In particular, the driver decides in each case, the consumer and the mode of operation of it. The driver can thus make an individual compromise between the comfort with fast and comfortable transport and an economical mode of operation of the vehicle. The indication will be issued if the sum of the energies received by the drive and at least one other consumer exceeds a predefined threshold. The driver is thus not hindered by any additional indication as long as the total energy consumption on board the motor vehicle is less than a predefined threshold value.

The determination of the energy received (or taken) may relate to a path of the vehicle to a predefined destination and an indication may be issued if the sum of the received amounts of energy determined in the path, exceeds the amount of available energy in the energy source.

Thus, the emission of the indication can be done only in case the driver risks that his driving or the use of other electrical consumers does not allow him to reach the predefined destination because of the premature exhaustion of the energy accumulator.

According to another development, the indication of the potential economy by training and the potential saving of energy according to a predefined maximum number of the other consumer with the highest potential saving. , remains limited. The display, for example, of up to three potential savings among consumers other than training, draws the driver's attention for the foreseeable future so as not to stray from the course. This ensures the safety of the driver's management of the vehicle.

The potential savings associated with at least one other consumer, can be determined to ensure the operation of the vehicle even if some potential energy savings are exhausted. This avoids creating a situation in which a driver would be led to cut or reduce the operation of a system relating to safety, such as for example the external illumination of the vehicle in the dark, so that the safety of the vehicle would be more assured. The indication may relate to at least one of the following: the proposed speed range, the position of the sliding roof, the position of a side window, the adjustment of the chassis and the setting of an automatic gearbox of the vehicle . This allows the display of potential energy savings that can not be influenced directly by the driver's mode of operation or by the electrical operation of other users. The indication relating to a potential economy of another user may include as information the manner of using the potential economy. It will then be possible to provide the driver with a specific driving indication that he can simply follow. This avoids the uncertainties of a potential saving, displayed, which avoids diverting the attention of the driver and distracting from the driving of the vehicle.

A computer program product includes program code for implementing the method as described above when the computer program product is run on a processing facility or is recorded on a computer readable data medium.

The device according to the invention for managing energy in an electric drive motor vehicle comprising a source of electrical energy and an electric drive powered from the energy source, also comprises a first installation for determining a power supply. energy of the electrical drive from the power source, a second installation for determining the energy received (energy taken) by one or more electrical consumers on board the vehicle powered from the power source, and a third installation for determining the potential savings of electrical energy by the drive and other electrical consumers and a transmission facility to provide an indication of some potential savings for the driver of the vehicle.

The device can be integrated totally or partially in one or more control systems embedded in the motor vehicle which allows if necessary not to use additional facilities and make savings if necessary.

The power source may be a rechargeable electric battery with or without an on-board installation for recharging the energy storage. The device can thus be applied to an electric vehicle equipped with electrochemical accumulators and / or fuel cells with or without extension of the radius of action and also on board a conventional vehicle equipped with an electric energy recuperator. .

The device preferably includes an interface with a vehicle navigation system for receiving information relating to a path at a predefined time. The information may include a planned travel time, a predicted distance and information on energy consumption during the journey to the destination.

drawings

The present invention will be described below in more detail with the aid of an embodiment of a method for managing energy in an electric drive vehicle shown in the accompanying drawings in which: FIG. a motor vehicle equipped with a power management device; FIG. 2 shows by way of example the display provided by the device of FIG. 1; FIG. 3 shows a block diagram of a method of management, and - Figure 4 shows another block diagram of a power management method.

Description of Embodiments of the Invention

FIG. 1 shows a motor vehicle 100 on a path 105 to a destination 110. The vehicle 100 comprises an electric drive 115 and a source of electrical power 120 supplying the electric drive 115. The electrical power source 120 can be a electrical energy storage device such as a capacitor or an accumulator. It may also be an internal combustion engine 125 fitted to the vehicle 100 and connected to the electrical power source 120 and to the electric drive 115 in the form of a hybrid drive in series, in parallel or with power bypass. The movement of the electric drive 115 or the internal combustion engine 125 is transmitted by an automatic transmission 130 to a wheel 135 of the motor vehicle 100. The wheels 135 are connected to the chassis 140 whose geometry, the suspension and / or the damping are adjustable by being connected to the bodywork 145 of the vehicle 100.

The vehicle 100 comprises a number of electrical users or consumers whose FIG. 1 gives, by way of example, a searchlight 150 and an air conditioning installation 155. A side window 160 and a sliding roof 165 of the vehicle 100 are movable and their adjustment is ensured respectively by an electrical drive installation or other. There is also provided a navigation system 170 cooperating preferably with satellites and with a card memory, not shown, containing the information relating to a road network which includes the path 105.

A power management device 175 is embedded in the vehicle 100. The device 175 includes a first interface 180 for exchanging information with the navigation system 170 as well as a second interface 185 for exchanging information with one or more data communication systems. control of the vehicle 100. These control systems are, for example, the electrical control system of one or more users or electrical consumers embedded in the vehicle 100, a drive control system for controlling or managing the electric drive motor. 115 and optionally the internal combustion engine 125 and another control system for controlling the state of the vehicle 100, for example by influencing the automatic transmission 130, the frame 140, the side window 160 and / or the roof sliding 165.

The device 175 includes a user interface 190 for enabling optical, acoustic and / or haptic interaction with the driver of the vehicle 100. The user interface 190 may also be controlled by another vehicle control system 100; the interaction of the conductor is done with the device 175 by the user interface 190, the other control system and the second interface 185.

The device 175 preferably comprises a programmable microcomputer. According to one embodiment, the device 175 is integrated in the control or management unit embedded in the vehicle 100. According to another embodiment, various functional parts of the device 175 are distributed between several control devices on board the vehicle. 100.

The device 175 determines the energy taken by the electric drive 115 and the electrical user on board the vehicle 100, such as for example the users 150 and 155 to determine the potential savings of electrical energy of these installations. The device 175 processes the potential savings thus determined and presents them through the user interface 190 to the driver of the vehicle 100.

FIG. 2 shows by way of example the optical presentation 200 of the device 175 by the user interface 190 of FIG.

The central zone 205 of the display 200 indicates the current speed of the vehicle 100 in digital form and with a round, stylized instrument for the graphic presentation. The speed range in which the electric drive 115 has better energy utilization is presented as a zone between a lower marker 210 and an upper marker 215 on the round instrument.

In the lower zone 220 of the display, from the left to the right there is a symbol or pictogram 225 for an air-conditioning system 155 (FIG. 1), a pictogram 230 indicating the heating of the windows, and pictogram 235 for the air-conditioning system. entertainment. Each of the symbols 225-235 represents an electrical consumer on board the vehicle 100 that can operate in a manner different from that currently used to minimize power consumption. The driver of the vehicle 100 can decide from the representation 200 how or in what way he wants to save some electric energy. The display 200 consists of representing at most a predefined number of symbols or pictograms 225-235; in this case it is three symbols 225-235. Preferably, the symbols 225-235 are classified according to their potential saving of energy, that is to say that in the representation of FIG. 2, the greatest potential saving of energy is obtained by the stopping or modifying the parameters of the air-conditioning system 155 whose symbol 225 is represented furthest to the left; this symbol is followed by the setting of the heating of the windows whose symbol 230 appears in the middle and finally one has the setting of the entertainment system whose symbol 235 is the most on the right.

As part of the display 200, it is also possible to provide indications for modifying the state of operation of the vehicle 100 to save energy by the electric drive 115, for example by closing the side window 160 or the sunroof 165, by adjusting the chassis 140 to switch from a sport mode to a comfort mode, a change in the switching characteristic of the automatic gearbox 130 or from a sporty design to an energy saving design. Display 200 can be combined with a condition. The representation or display 200 can be done solely for potential energy savings if a practical demand for energy saving has been defined, for example to reach a previously defined destination with the vehicle without wasting electrical energy 120 to beyond what is possible. The need for economy can be quantified so that from the display 200, the driver intervenes or takes measures to save energy until the need for energy saving is covered.

According to another development, instead of symbols 225-235, there is also a realistic representation such as the photo of a suitable operating element. The activation of a corresponding input element to modify the operating parameters of the electrical consumer represented can be done by the user touching the appropriate symbol 225-235 or the representation associated with it by activating buttons of the steering wheel, in using a centralized input device (iDrive) or using conventional switching elements.

According to another development, the available range of the vehicle 105 around a position based on the available electrical energy as well as on the power consumption by the electric drive 115 and the electrical consumers can be presented on 200. A map view based on an embodiment of the navigational system 170 map data may be used. The range display may also include an indication of how to change the radius of action if some potential energy saving potential has been used. The use of the potential energy saving can also be simulated in the context of the representation so that by activating or neutralizing, for example, users embedded in the vehicle 100, it will firstly be possible to verify the effect on the radius of action before actually influencing consumers by resuming the simulated settings.

Once the destination 110 is reached, a statistic is issued indicating which of the measures taken by the driver has resulted in a practical saving of energy. The driver can feel rewarded, which corresponds to learning about the awareness of energy saving.

The variants of the display 200 described with reference to FIG. 2 can be combined with each other and, if necessary, appear simultaneously. The display 200 may be reinforced by an acoustic and / or haptic emission.

Figure 3 shows a method 300 of energy management. The method 300 is preferably applied by the processing facility 175 of Fig. 1 and / or other vehicle control system processing facilities 100 according to Fig. 1.

In a first step 305, the length of the path 105 is determined. The step 305 determines the instantaneous position of the vehicle 100 and the position of the destination 110 as well as a path between the two positions on a road network.

Then, in step 310, the predicted power requirement for the electrical drive 115 is determined on the path 105. This determination may be based on information about the path 105, for example ascents or descents, events of traffic, the maximum speed allowed on a segment of the journey and others.

In step 315, the predicted energy intake of one or more other electrical consumers such as consumers 150 and 155 in the path is determined. This determination can also be based on information about the path 105, for example the use of a motorway may require the start-up of the projector 150 for regulatory reasons.

In the following step 320, the electrical energy available in the electrical energy source 120 is determined. The power of the internal combustion engine 125 can be taken into account. If a mode of energy recovery is possible, it is possible to take into account the power of the internal combustion engine 125. also take into account a descent on the path 105 for energy recovery.

In step 325, it is determined whether the amount of energy taken determined in steps 310 and 315 exceeds the available energy defined in step 320. Next, it is determined whether destination 110 can or not to be affected by the assumptions thus made, ie a certain mode of conduct and a certain way of functioning of other electrical consumers.

If the destination is possible, the process 300 returns to step 305 and the process 300 can begin again. In the opposite case, step 330 is continued by which the potential energy savings are determined by the electric drive 115. This may concern in particular the determination of a speed of the vehicle 105 for which the electrical energy taken from the energy source 120 will be transformed with a particularly high efficiency for the movement of the vehicle 100. In addition, in step 335, the potential energy savings are determined at least from another electrical consumer embedded in the vehicle 100 .

According to one embodiment, only the potential energy savings that make it possible to operate the vehicle 100 in complete safety are verified. If, for example, the outside temperature is -20 ° C, for the safety of operation, it may be necessary to implement the electric heating of the passenger compartment of the vehicle 100 to a minimum determined temperature. According to another example, in night traffic, we can not consider cutting the headlamps 150 to avoid risky operation of the vehicle 100.

In step 340, the potential energy savings defined in step 335 are graded and a predefined number of potential energy savings are counted that correspond to the highest potential savings.

In the next step 345, the processed results are transmitted using the user interface 190 to the driver of the vehicle 100 and the process returns to step 305 to start again.

The order of steps 305-345, in particular that of steps 305-320 and 330-345, may be varied. According to some variants of the method 300, not all steps 305-345 are implemented.

Figure 4 shows another method 400 of energy management. The method uses the method 300 of Figure 3 but applies other conditions for performing steps 330-345.

In a first step 405, the power take-off is defined by the electric drive 115. This determination is analogous to that of step 310 while determining the energy received (energy taken) without referring to the path 105.

Then, the energy received by at least one other consumer on board the vehicle 100 is determined in a step 410. This determination is also done as in the corresponding step 315 of FIG. 3 without however referring to the path 105.

In step 415, it is checked whether the sum of the received energies defined in steps 405 and 410 exceeds a predefined threshold. If this is not the case, the method 400 returns to step 405 and restarts. In the opposite case, steps 330-345 of FIG. 3 are followed by deleting, if necessary, the references to the path 105. After executing the steps 330-345, the method 400 returns to the step 405 and can start again.

NOMENCLATURE 100 motor vehicle 105 journey 115 electric drive 120 electric power source 125 combustion engine 130 automatic transmission 135 wheel 140 chassis 145 body 150 projector 155 air conditioning system 160 side window 165 sunroof 170 navigation system 175 control device energy 180 first interface 185 second interface 190 user interface 200 optical display 205 central area of the display 220 lower right area of the display 225 symbol of an air conditioning system 230 symbol of the window heater 235 symbol of the musical system 300 energy management process 305-345 process steps 300 400 energy management process 405-415 process steps 400

Claims (1)

RE VEN D1 CATIONS 1 °) Energy management method (300) in an electrically driven motor vehicle (100) having an electric power source (120) and an electric drive (115) powered from the power source. energy (120), characterized by the steps of: - determining (310) the energy received by the electrical drive from the power source (120), - determining (315) the energy received by at least one other electrical consumer (150, 155) aboard the vehicle (100) from the power source (120), - determining (330, 335) potential savings of electrical energy by the drive ( 115) and by at least one other electrical consumer (150, 155), and - emitting (345) an indication of potential savings to the driver of the vehicle (100), - the determinations of the energies received (310, 315) being related to a path (105) of the vehicle (100) to a predefined destination and the indication (345) being issued if the sum of the received energies determined on the path (105) exceeds the amount of energy that can be supplied by the power source (120), 2 Method (300) according to claim 1, characterized in that the indication is issued if the sum of the energies received by the drive (115) and by at least one other consumer (150, 155) exceeds a threshold predefined. Method (300) according to claim 1, characterized in that the indication is responsive to the potential saving by the drive (115) and the potential energy savings, comprises a maximum of a predefined number of other consumers (150, 155) corresponding to the highest potential energy savings. 4) Method (300) according to claim 1, characterized in that the potential energy savings are defined by at least one other consumer (150, 155) to ensure the certainty of the operation of the vehicle (100) even exhausting some potential energy savings. Method (300) according to claim 1, characterized in that the indication contains at least one of the following: a proposed speed range (210, 215), a sunroof position (165), or side window position (160), a chassis setting (140) and a setting of the automatic transmission (130) of the vehicle (100). Method (300) according to claim 1, characterized in that the indication concerning a potential saving of another consumer (150, 155) comprises information for utilizing the potential saving. 7 °) Computer program product comprising a program code for the implementation of the method (300) according to one of claims 1 to 6 when the computer program product is applied by a processing facility (175) or is recorded on a computer readable data medium. 8 °) power management device (175) in an electrically driven motor vehicle (100) having an electric power source (120) and an electric drive (115) powered from the power source (120), characterized in that it comprises: - a first determination device (185) for determining the energy received by the electric drive (115) from the power source (120), - a second determination facility (185) for determining the energy received by at least one other electrical consumer on board the vehicle (100) from the power source (120), - the determination facilities (185) being capable of reporting the received energy determinations (310, 315) to a path (105) of the vehicle (100) to a predefined destination, - a third determining facility (175) for determining potential energy savings. by the drive (115) and the other electrical consumers (150, 155), and - a transmission facility (190) for issuing an indication concerning. determined potential savings for the driver of the motor vehicle (100), - the transmission facility (190) being capable of issuing an indication whether the sum of the received energies determined on the path (105) exceeds the quantity of energy that can be supplied by the energy source (120). Device (175) according to claim 8, characterized in that the energy source comprises a rechargeable electric energy accumulator (120) with or without an on-board installation for charging the energy accumulator (120). Device (175) according to claim 8 or 9, characterized in that it further comprises an interface (180) to a navigation system (170) of the motor vehicle (100) for receiving information relating to the path ( 105) to a predefined destination (110).