Method and device for controlling a multiplanar head-up vision system for an electric vehicle

Abstract

The present invention relates to a method and device for controlling a multiplane head-up vision (HV) system (2) of an electric vehicle. To this end, the multiplane HV system (2) is controlled to distribute a display of first graphic content representing an eco-score, second graphic content representing an acceleration instruction, and third graphic content representing a deceleration instruction onto the first, second, and third image planes (201, 202, 203) of the multiplane HV system (2) according to the eco-score and a current phase corresponding to an acceleration or deceleration phase of the electric vehicle. Figure 2

Description

Title of the invention: Method and device for controlling a multiplanar head-up vision system of an electric vehicle technical field

[0001] The invention relates to methods and devices for controlling a multiplanar head-up display system, referred to as a multiplanar HUD system, in an electric vehicle, particularly but not exclusively an electric motor vehicle. The invention also relates to a method and device for driver assistance in an electric vehicle. Technological background

[0002] The rise of electric vehicles, that is, vehicles with one or more electric motors powered by a traction battery, has led to the development of new needs to assist drivers of such electric vehicles. To monitor and improve the range of electric vehicles, manufacturers propose displaying a set of information on the vehicle's screen, allowing the driver to track electrical energy consumption, remaining range, and a score indicating whether the electric vehicle's driving is economical or, conversely, energy-intensive on recent journeys, thus helping the driver potentially adapt their driving style.

[0003] Such information is available by navigating through a set of other available information, which complicates access to this information during a journey and reduces the driver's concentration on driving, thus posing a safety risk to the electric vehicle and other road users. Furthermore, the information associated with the score is often imprecise and not tailored to the current journey. Summary of the present invention

[0004] An object of the present invention is to solve at least one of the problems of the technological background described above.

[0005] An object of the present invention is, for example, to improve the user experience with regard to the control of energy consumption and range of an electric vehicle.

[0006] Another object of the present invention is to minimize the driver's loss of attention and to improve the safety of the electric vehicle.

[0007] According to a first aspect, the present invention relates to a method for controlling a multiplane head-up vision system, referred to as a multiplane HV system, of an electric vehicle, the multiplane HV system being configured for displaying images in a plurality of image planes comprising a first image plane at a first distance from a viewpoint associated with a driving position of the electric vehicle, a second image plane at a second distance from the viewpoint greater than the first distance and a third image plane at a third distance from the viewpoint greater than the second distance, the method being implemented by at least one processor and comprising the following steps: - during an acceleration phase of the electric vehicle, determination of a minimum quantity of electrical energy required to reach or maintain a first speed setpoint determined according to at least one slope of at least one section of road taken by the electric vehicle, current meteorological data and at least one intrinsic characteristic of the electric vehicle and determination of an acceleration curve as a function of a speed to reach or maintain the first speed setpoint; - during a deceleration phase of the electric vehicle, determination of a maximum amount of electrical energy to be recovered via an electric vehicle electrical energy regeneration system as a function of a distance between the electric vehicle and an object detected in front of the electric vehicle, a speed of the electric vehicle when the object is detected and a second setpoint speed associated with the detection of the object and determination of a deceleration curve as a function of the speed to obtain the maximum amount of electrical energy; - determination of a score representative of a ratio between on the one hand a quantity of electrical energy expended during the acceleration phase and / or a quantity of electrical energy recovered during the deceleration phase and on the other hand the minimum quantity of electrical energy and / or the maximum quantity of electrical energy; - control of the multi-plane VTH system to distribute a display of a first graphic content representing the score, a second graphic content representing an acceleration instruction and a third graphic content representing a deceleration instruction on the first, second and third image planes according to the score and a current phase corresponding to the acceleration phase or the deceleration phase.

[0008] Determining an acceleration curve and / or a deceleration curve based on the characteristics of the electric vehicle and terrain data such as road gradient, weather data, and distance from an object causing the electric vehicle to slow down allows for the provision of acceleration and deceleration instructions via the multi-plane VTH system to the electric vehicle driver, taking into account the environment being traversed. Furthermore, the use of a score representing the performance of the electric vehicle's energy balance, based on the amount of energy expended or recovered relative to optimal targets for Controlling the display of information relating to the energy consumption / recovery balance on the different image planes offered by the VTH multiplane system allows you to emphasize one content or another depending on the score obtained, for example to improve the balance if necessary.

[0009] According to one variant, the first graphic content is displayed in the foreground of the image when the score is greater than a threshold.

[0010] According to an additional variant, the second graphic content is displayed in the foreground image when the score is below the threshold and when the current phase corresponds to the acceleration phase.

[0011] According to yet another variant, the third graphic content is displayed in the foreground image when the score is below the threshold and when the current phase corresponds to the deceleration phase.

[0012] According to an additional variant, at least one slope is determined from mapping data or data received from a gyroscope on board the electric vehicle.

[0013] According to a further variant, at least one intrinsic characteristic belongs to a set of characteristics comprising: - an air penetration coefficient of the electric vehicle; - the mass of the electric vehicle; - the power of an electric vehicle motor; - a distribution of the mass of the electric vehicle.

[0014] According to yet another variant, the acceleration curve and the deceleration curve are determined by an adaptive speed control system on board the electric vehicle.

[0015] According to a second aspect, the present invention relates to a control device for a multiplane head-up vision system of an electric vehicle, the device comprising a memory associated with a processor configured for the implementation of the steps of the process according to the first aspect of the present invention.

[0016] According to a third aspect, the present invention relates to an electric vehicle, for example of the automobile type, comprising a device as described above according to the second aspect of the present invention.

[0017] According to a fourth aspect, the present invention relates to a system comprising the vehicle as described above according to the third aspect of the present invention and a mobile communication device connected in communication to the electric vehicle according to a screen duplication mode.

[0018] According to a fifth aspect, the present invention relates to a computer program that includes instructions adapted for executing the steps of the method according to the first aspect of the present invention, in particular when the computer program is executed by at least one processor.

[0019] Such a computer program may use any programming language, and be in the form of source code, object code, or an intermediate form between source code and object code, such as in a partially compiled form, or in any other desirable form.

[0020] According to a sixth aspect, the present invention relates to a computer-readable recording medium on which is recorded a computer program comprising instructions for carrying out the steps of the process according to the first aspect of the present invention.

[0021] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium can include a storage means, such as a ROM, a CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means or a hard disk drive.

[0022] On the other hand, this recording medium can also be a transmissible medium such as an electrical or optical signal, such a signal being able to be transmitted via an electrical or optical cable, by conventional or radio frequency, by self-directing laser beam, or by other means. The computer program according to the present invention can, in particular, be downloaded from an Internet-type network.

[0023] Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the process in question. Brief description of the figures

[0024] Other features and advantages of the present invention will become apparent from the description of the particular and non-limiting embodiments of the present invention below, with reference to the attached Figures 1 to 4, in which:

[0025] [Fig-1] schematically illustrates part of a passenger compartment of an electric vehicle incorporating a multiplane head-up vision system, according to a particular embodiment of the present invention, according to a particular embodiment of the present invention;

[0026] [Fig.2] schematically illustrates the multiplane head-up vision system of the electric vehicle of [Fig.1], according to a first particular and non-limiting embodiment of the present invention;

[0027] [Fig.3] illustrates a device configured to control the multiplane head-up vision system of the electric vehicle of [Fig.1], according to a particular and non-limiting embodiment of the present invention.

[0028] [Fig.4] illustrates a flowchart of the different stages of a process for controlling the Multiplanar head-up display system for the electric vehicle of [Fig. 1], according to a particular and non-limiting embodiment of the present invention. Description of embodiment examples

[0029] A method and a control device for a multiplane head-up vision system, referred to as a multiplane HV system, of an electric vehicle will now be described in what follows with joint reference to Figures 1 to 4. The same elements are identified with the same reference signs throughout the description that follows.

[0030] The terms "first," "second" (or "firsts," "seconds"), etc., are used in this document by arbitrary convention to allow for the identification and distinction of different elements (such as operations, means, etc.) implemented in the embodiments described below. Such elements may be distinct or correspond to a single element, depending on the embodiment.

[0031] Fig. 1 schematically illustrates part of the passenger compartment of an electric vehicle 10, according to a particular and non-limiting embodiment of the present invention.

[0032] The electric vehicle 10 corresponds to a vehicle comprising one or more electric motors powered by a traction battery on board the electric vehicle 10. The electric vehicle 10 thus corresponds for example to a land electric vehicle, for example a car, a truck, a bus.

[0033] The vehicle 10 carries a traction battery and a BMS (Battery Management System) device or system configured to monitor the state of the traction battery and determine the electrical energy consumption of the electric vehicle 10 at any given time. Such a BMS is, for example, associated or coupled with the traction battery. Such a BMS makes it possible to obtain or measure, at a given time 't', the state or charge level via one or more of the following parameters: - the state of charge, known as SOC (from the English "State of Charge") or depth of discharge, known as DOD (from the English "Depth of Discharge"), indicating the battery's charge level; and / or - the voltage: total or of each cell of the battery; and / or - Temperature: average temperature, coolant inlet temperature, coolant outlet temperature, temperature of each battery cell; and / or - the state of health, known as SOH (from the English "State Of Health"); and / or - the current (intensity in amperes) in or out of the battery.

[0034] The BMS system thus makes it possible to know at any time the amount of electrical energy consumed by the electric vehicle 10, in particular the amount of electrical energy consumed by the electric motor(s) of the electric vehicle 10 during a journey made with the electric vehicle 10.

[0035] The electric vehicle 10 also incorporates an energy recovery system (also called an energy regeneration system or regenerative braking system) configured to recover electrical energy by converting a portion of the kinetic energy generated during deceleration phases of the electric vehicle 10 into electrical energy. The electrical energy thus recovered is used to recharge the traction battery of the electric vehicle 10 and improve its range. The energy recovery system generally relies on the reversibility of the electric motor of the electric vehicle 10, which operates as a generator by converting mechanical energy into electrical energy during deceleration of the electric vehicle 10 and as a motor by consuming the electrical energy received from the traction battery during acceleration phases to reach or maintain a set speed.

[0036] The amount of electrical energy generated by the energy recovery system is, for example, measured by the BMS system.

[0037] The vehicle 10 advantageously incorporates a multiplane head-up display system, hereafter referred to as a multiplane HUD (also called a HUD system), configured to display a set of images at different distances or depths from a viewpoint corresponding to the driver of the electric vehicle 10, i.e., on different image planes, with a specific depth or distance from the viewpoint being associated with each image plane. Each image comprises a set of graphic objects displayed by projection onto a transparent or semi-transparent surface.

[0038] The transparent or semi-transparent surface corresponds, for example, to a strip 102 arranged on the dashboard of the vehicle 10, for example above and behind the steering wheel with respect to a viewpoint corresponding to the viewpoint from which a driver is supposed to look at the road ahead when driving the vehicle 10. According to another example, the transparent or semi-transparent surface corresponds to a determined area of ​​the windscreen 101 onto which the set of images is projected.

[0039] The VTH system corresponds, for example, to a so-called augmented reality (AR) system, configured to overlay virtual objects into the driver's field of vision, for example onto the slat 102 or the windshield 101 of the vehicle 10, so as to superimpose the virtual objects onto the real road scene. The projection of the images of the graphic object is, for example, controlled by one or more computers of the vehicle 10's onboard network, for example by the vehicle infotainment system computer, also known as the IVI computer (from the English "In-Vehicle Infotainment" or in French "Infodivertissement étoilé") 10.

[0040] The multiplane VTH system includes one or more image projectors, for example recessed in a housing provided in the dashboard 103 of the vehicle 10, associated with one or more mirrors.

[0041] The various systems of the electric vehicle 10, in particular the multiplane VTH system, are each controlled by one or more computers. These computers form, for example, a multiplexed architecture for the implementation of various services useful for the proper functioning of the electric vehicle and for assisting the driver and / or passengers of the electric vehicle in controlling the electric vehicle 10.Computers communicate and exchange data with each other via one or more computer buses, for example a CAN (Controller Area Network), CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (according to ISO 17458), LIN (Local Interconnect Network), or Ethernet (according to ISO / IEC 802-3) type communication bus.

[0042] Fig. 2 illustrates a multiplanar head-up vision system 2 of the electric vehicle 10, according to a particular and non-limiting embodiment of the invention.

[0043] The VTH multiplane 2 system is adapted for displaying different graphic content in different image planes 201, 202, 203, as described previously with regard to [Fig.1].

[0044] Figure 2 illustrates certain elements forming the VTH 2 system. For clarity, the scales of the elements and the differences in scale between the different elements are not to scale. For the same reason of clarity, the elements are represented according to different scales.

[0045] According to the example in [Fig.2], the number of image planes obtained by the multiplane VTH system 2 is equal to 3. Of course, the invention is not limited to such a multiplane VTH system but extends to any multiplane VTH system configured for the display of graphic content in 2 or more image planes.

[0046] The multiplane VTH system 2 comprises three image projectors 21, 22, 23, each configured to emit a light beam along a principal emission direction directed towards a mirror 21. The image information carried by each light beam varies temporally according to the image of the sequence to be projected onto the slat 102 (or, alternatively, onto the windshield 101) after reflection from the mirror 24. Each image projector 21, 22, 23 corresponds, for example, to a single projector focal length, for example of the "emissive" type, the projector corresponding for example to a laser scanner comprising at least one laser diode, for example three laser diodes to generate three different colors, for example RGB (one diode per RGB color (from the English "Red, Green, Blue" or in French "rouge, vert, bleu")).

[0047] Each image projector 21, 22, 23 is oriented at a different angle with respect to the reflective surface of the mirror to project graphic content onto the different image planes 201, 202, 203. For example, the first image projector 21 is oriented at a first angle with respect to the mirror 24 so that the graphic content projected by this first projector 21 is displayed in the first image plane 201, the second image projector 22 is oriented at a second angle with respect to the mirror 24 so that the graphic content projected by this second projector 22 is displayed in the second image plane 202 and the third image projector 23 is oriented at a third angle with respect to the mirror 24 so that the graphic content projected by this third projector 23 is displayed in the third image plane 203.

[0048] According to one variant, the multiplane VTH system comprises 3 image projectors 21, 22, 23 and 3 mirrors, each image projector 21, 22, 23 projecting a light beam towards a different mirror of the set of 3 mirrors, each of the mirrors being oriented to reflect the received light beam towards the transparent or semi-transparent surface 102 and display associated graphic content in a different image plane of the set of image planes 201, 202, 203.

[0049] According to another variant, the multiplane VTH system comprises a single image projector associated with 3 mirrors to display different graphic content in the 3 image planes 201, 202 and 203.

[0050] According to a particular embodiment, the image projectors 21, 22, 23 are arranged so that the image planes 201, 202, 203 associated with each projector 21, 22, 23, respectively, are aligned along a principal direction 210 for displaying the graphic content projected by the projectors 21, 22, 23 within the field of vision 200 associated with the viewpoint 20 from which this graphic content is viewed by the driver. The graphic content or images displayed in each image plane 201, 202, 203 visually overlap, with only the depth (i.e., the distance between the image plane and the viewpoint 20) varying according to the image plane 201, 202, 203 when the viewpoint 20 remains stationary.

[0051] A control process for the multiplane VTH system 2 for displaying graphic content on the different image planes 201, 202, 203 is advantageously implemented by one or more processors, for example by one or more processors of an electric vehicle computer 10.

[0052] In a first operation of the process, a setpoint speed is determined. This setpoint speed corresponds to: - a first target speed requiring an acceleration of the electric vehicle 10 to reach or maintain this first target speed from a current speed of the electric vehicle 10; or - a second target speed requiring a deceleration of the electric vehicle 10 to reach this second target speed from a current speed of the electric vehicle 10.

[0053] The first and second set speeds are determined from data obtained from one or more sensors on board the electric vehicle 10 and / or mapping data.

[0054] A set speed is for example determined via a traffic sign detection and recognition system configured to determine a speed limit applicable on a section of road on which the electric vehicle 10 is traveling.

[0055] According to another example, the applicable speed limit is determined from mapping data, which is for example stored in a memory of the electric vehicle 10 or received from a "cloud" server via a wireless connection.

[0056] According to another example, the set speed is determined from data received from one or more sensors such as radar or lidar, for example when the set speed corresponds to the speed of another vehicle traveling in front of the electric vehicle 10, the set speed is then equal to the speed of the other vehicle and calculated so that the electric vehicle 10 remains at a predetermined distance from the other vehicle. This predetermined distance corresponds to an inter-vehicle distance, denoted IVD, or is deduced from an inter-vehicle time, denoted IVT. The IVT or IVD corresponds, for example, to a parameter of an adaptive cruise control system for the electric vehicle, known as ACC (Adaptive Cruise Control).According to this example, the ACC system calculates the target speed even if the ACC system is not active, i.e., even if the current speed of the electric vehicle 10 is not automatically regulated by the ACC system.

[0057] According to yet another example, the set speed is determined from sensor data such as radar, lidar or camera. According to this example, the set speed is equal to 0 when an object that the electric vehicle 10 is approaching corresponds to an obstacle (for example a stationary vehicle), a pedestrian crossing the road, a red traffic light, etc.

[0058] When the set speed corresponds to a speed greater than or equal to a current speed of the electric vehicle 10, the electric vehicle 10 is then in a acceleration phase requiring an acceleration greater than or equal to 0 from the driver to reach or maintain the first set speed when the latter is reached.

[0059] When the set speed corresponds to a speed lower than a current set speed of the electric vehicle 10, greater than or equal to a current speed of the electric vehicle 10, the electric vehicle 10 is then in a phase called deceleration requiring a deceleration (corresponding to a negative acceleration) from the driver to reach the second set speed.

[0060] In a second operation of the process, when the electric vehicle 10 is in an acceleration phase, a minimum amount of electrical energy required to reach or maintain the first speed setpoint is determined as a function of a slope of a portion of road traveled by the electric vehicle 10, current meteorological data and at least one intrinsic characteristic of the electric vehicle 10. During this acceleration phase of the electric vehicle 10, an acceleration curve is determined or calculated as a function of the speed of the electric vehicle 10 to reach or maintain the first speed setpoint.

[0061] The minimum quantity of electrical energy corresponds to a value, for example, expressed in kWh, representing the minimum energy that the motor of the electric vehicle 10 will need to reach or maintain the first set speed, this minimum value being calculated by optimizing the accelerations of the vehicle as a function of time to reduce as much as possible the energy needed to achieve this objective.

[0062] This acceleration curve represents the theoretical acceleration values ​​that the driver of the electric vehicle 10 should command via the accelerator pedal to minimize the electrical energy consumption of the electric vehicle 10.

[0063] The slope(s) of the section(s) of road which the electric vehicle 10 will undergo to reach or maintain the first set speed is / are determined for example from mapping data or data received from a gyroscope on board the electric vehicle 10.

[0064] The intrinsic characteristic(s) of the electric vehicle 10 correspond to one or more of the following characteristics, according to all possible combinations: - a coefficient of penetration in the air of the electric vehicle 10, denoted Cx; - a mass or weight of the electric vehicle 10; - the power of the electric vehicle's motor 10, expressed for example in kW; - the distribution of the mass or weight of the electric vehicle 10, for example a distribution over the front and rear axles.

[0065] Meteorological data are, for example, obtained from one or more sensors of the electric vehicle 10 and / or are received from a data server. meteorological data via a wireless connection between the electric vehicle and a wireless network infrastructure connected to the "cloud" including the meteorological data server.

[0066] The meteorological data corresponds to one or more of the following data, according to all possible combinations: - outside temperature; - presence of precipitation with optionally the intensity of precipitation and the type of precipitation (e.g. rain, snow, ice, etc.); - presence of wind, with for example the intensity, strength or speed of the wind (expressed in km / h) and the direction of the wind.

[0067] Other data from the external environment in which the electric vehicle 10 travels are, for example, also taken into account to determine the minimum amount of electrical energy and the associated acceleration curve, such as, for example, the type of road surface, the condition of the surface, the presence of bends on the route, etc.

[0068] The minimum quantity of electrical energy and the associated acceleration curve are, for example, updated as the electric vehicle 10 moves according to the different data received.

[0069] When the electric vehicle 10 is decelerating, the maximum amount of electrical energy to be recovered via the electric vehicle 10's regenerative braking system is determined based on the distance between the electric vehicle 10 and an object detected in front of the electric vehicle 10, the speed of the electric vehicle 10 at the time of object detection, and a second setpoint speed associated with object detection. During this deceleration phase of the electric vehicle 10, a deceleration curve is determined or calculated based on the speed of the electric vehicle to obtain the maximum amount of electrical energy.

[0070] The maximum amount of electrical energy to be recovered corresponds to a value, for example, expressed in kWh, representing the maximum energy that the motor operating as a generator is likely to generate during the deceleration of the electric vehicle to reach the second set speed. This maximum value is calculated by optimizing the decelerations of the electric vehicle 10 over time to generate as much electrical energy as possible. To this end, the deceleration values ​​over time are calculated to reduce the use of the electric vehicle 10's brakes as much as possible to reach the second set speed over the allotted distance (in particular when the second set speed is zero and the detected object requires the electric vehicle 10 to stop, for example, when the detected object is a stationary obstacle on the road). traffic in front of the electric vehicle or when the detected object corresponds to a stop sign, a yield sign, a red traffic light, etc.).

[0071] This deceleration curve represents the theoretical deceleration values ​​that the driver of the electric vehicle 10 should follow by stopping accelerating and / or pressing the brake pedal with the intensity required to minimize the use of the brakes and maximize the braking of the electric vehicle 10 via the electric motor operating in generator mode.

[0072] Acceleration and deceleration curves are, for example, calculated or determined by the ACC system, even though the speed regulation of the electric vehicle 10 is not controlled by the ACC system.

[0073] In a third operation of the process, a score representative of a ratio between on the one hand an electrical energy expended during the acceleration phase and / or the electrical energy recovered during the deceleration phase and on the other hand the minimum electrical energy and / or the maximum quantity of electrical energy is determined.

[0074] This score corresponds, for example, to the result of the evaluation of the electric vehicle's driving performance 10 based on the determined acceleration and deceleration curves. This score corresponds, for example, to an eco-driving score, that is, environmentally friendly driving that minimizes the electric vehicle's energy consumption and maximizes the electrical energy recovered.

[0075] This score, denoted 'S', is calculated for example using the following formula:

[0076] S = (Ec - Er) / (Em - EM)

[0077] With Ec corresponding to the electrical energy consumed to reach the first set speed, Er the energy recovered until reaching the second set speed, Em the minimum electrical energy required to reach or maintain the first set speed and EM the maximum electrical energy to be recovered.

[0078] According to variant embodiments, a first score is calculated for the acceleration phase(s), such a score being equal to Ec / Em and a second score is calculated for the deceleration phase(s), such a second score being equal to Er / EM.

[0079] In a fourth operation of the process, the multiplane VTH system 2 is controlled to distribute a display of a first graphic content representing the score, a second graphic content representing an acceleration instruction and a third graphic content representing a deceleration instruction on the first, second and third image planes 201, 202, 203 according to the score and a current phase corresponding to the acceleration phase or the deceleration phase of the electric vehicle 10.

[0080] The computer in charge of controlling the multiplane VTH system 2 controls, for example, the distribution of the projection of the first, second and third graphic contents by the first, second and third image projectors 21, 22, 23 such that the first, second, and third graphic elements are each displayed on a different image plane among the three image planes 201, 202, and 203.

[0081] For example, when the score is above a threshold (e.g., above 80, 85, or 90%), the first graphic element representing the score is displayed on the first image plane 201, which is located at a first distance from viewpoint 20 and corresponds to the image plane closest to viewpoint 20 among the three image planes 201, 202, and 203. According to this example, the second graphic element is displayed on the second image plane 202, which is located at a second distance from viewpoint 20, the second distance being greater than the first distance. The third graphic element is displayed on the third image plane 203, which is located at a third distance from viewpoint 20, the third distance being greater than the second distance.According to one variant, the second graphic content is displayed in the third image plane 203 and the third graphic content is displayed in the second image plane 202.

[0082] When the score is below the threshold and the electric vehicle is in an acceleration phase, the second graphic content is displayed in the first image plane 201. The first graphic content is then, for example, displayed in the second image plane 202 and the third graphic content is displayed in the third image plane 203. According to a variant, the third graphic content is displayed in the second image plane 202 and the first graphic content is displayed in the third image plane 203.

[0083] When the score is below the threshold and the electric vehicle is in a deceleration phase, the third graphic content is displayed in the first image plane 201. The first graphic content is then, for example, displayed in the second image plane 202 and the second graphic content is displayed in the third image plane 203. According to a variant, the second graphic content is displayed in the second image plane 202 and the first graphic content is displayed in the third image plane 203.

[0084] The distribution of the display of graphic content not shown in the foreground between the second and third image planes 202, 203 is, for example, a function of the graphic content that was previously displayed in the foreground. For example, when the second graphic content takes the place of the first graphic content in the foreground image 201, then the first graphic content is displayed in the second image plane 202 (which is directly behind the image plane 201 from the viewpoint 20), and the third graphic content is displayed in the third image plane 203. According to this embodiment, the graphic content displayed in the second image plane 202 corresponds primarily to the graphic content previously displayed in the foreground image 201 before the content displayed in the foreground image 201 changed.

[0085] The first graphic content representing the score includes, for example, a graphic object representing the current score, for example in the form of a number displayed as a percentage or in the form of a graph or a bar representing the value of the score in relation to a maximum value that the score can theoretically reach (for example, 100%).

[0086] Displaying the first graphic content in the foreground image 201 when the score is above the threshold makes it possible to highlight that the energy balance associated with the driving style of the electric vehicle 10 by the driver is very good, that is to say that the driving style of the electric vehicle (intensity of acceleration and braking) is adapted to ecological driving optimizing energy consumption and regeneration.

[0087] The second graphic content representing an acceleration instruction includes, for example, one or more graphic objects visually indicating to the driver the recommended acceleration intensity to reach or maintain the initial target speed and minimize electrical energy consumption. Thus, when the electric vehicle is accelerating and the score is below the threshold (indicating that the driving style is not suitable for minimizing energy consumption), the second graphic content is displayed in the first plane 201 closest to the driver's viewpoint and most visible to the driver to highlight this second graphic content and provide visual instructions to the driver, within their field of vision, to adapt their driving style in order to minimize energy consumption during the acceleration phase.The graphic object(s) correspond, for example, to an acceleration scale with a set of levels, each representing an intensity of acceleration, the level of acceleration to be applied being graphically highlighted in the scale.

[0088] The third graphic content representing a deceleration instruction includes, for example, one or more graphic objects visually indicating to the driver the recommended braking force via an action on the brake pedal to reach the second set speed and maximize the recovery / regeneration of electrical energy by the electric motor operating in generator mode. Thus, when the electric vehicle is decelerating and the score is below the threshold (indicating that the driving style is not suitable for maximizing energy recovery), the third graphic content is displayed in the first plane 201 closest to the viewpoint and most visible to the driver to highlight this third graphic content and To provide visual instructions to the driver, within their field of vision, so they can adapt their driving style to maximize energy recovery during deceleration. The graphic object(s) correspond, for example, to a braking scale with a set of levels, each representing a braking intensity or force, with the braking force (which can be equal to 0) to be applied being graphically highlighted on the scale.

[0089] The first, second, and third graphic elements are displayed transparently in the driver's field of vision 200. The level of transparency depends, for example, on the image plane in which each graphic element is displayed. The level of transparency increases, for example, from the first image plane 201 (lowest transparency level) to the third image plane 203 (highest transparency level) to emphasize the information displayed in the first image plane 201. In one embodiment, the level of transparency is the same for all image planes 201, 202, and 203.

[0090] Displaying graphic content within the driver's field of vision 200, while they are looking at the road ahead through the windshield 101, increases the driver's attention on the road compared to a display on a screen located on the dashboard 103 or behind the steering wheel (a screen referred to as a cluster). This improves the driver's reaction time in the event of an unforeseen circumstance, as the driver can keep their eyes on the road while still having access to the information displayed in the image planes thanks to the multi-plane VTH system 2.

[0091] Figure 3 schematically illustrates a device 3 configured to control a multiplane head-up vision system of a vehicle, for example the multiplane HV system 2 of the electric vehicle 10, according to particular and non-limiting embodiments of the present invention. The device 3 corresponds, for example, to a device embedded in the vehicle 10, for example a computer.

[0092] Device 3 is, for example, configured to carry out the operations described opposite Figures 1 and 2 and / or the steps of the process described opposite [Fig. 4]. Examples of such a device 3 include, but are not limited to, embedded electronic equipment such as a vehicle's on-board computer, an electronic control unit such as an ECU (Electronic Control Unit), a smartphone, a tablet, or a laptop computer. The elements of device 3, individually or in combination, can be integrated into a single integrated circuit, into several integrated circuits, and / or into discrete components. Device 3 can be implemented in the form of electronic circuits or software (or computer) modules, or a combination of electronic circuits and software modules.

[0093] The device 3 comprises one (or more) processor(s) 30 configured to execute instructions for carrying out the steps of the process and / or for executing instructions from the software embedded in the device 3. The processor 30 may include integrated memory, an input / output interface, and various circuits known to those skilled in the art. The device 3 further comprises at least one memory 31, corresponding, for example, to volatile and / or non-volatile memory, and / or includes a memory storage device that may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic disk, or optical disk.

[0094] The computer code of the embedded software(s) including the instructions to be loaded and executed by the processor is for example stored on memory 31.

[0095] According to various specific and non-limiting embodiments, the device 3 is coupled in communication with other similar devices or systems and / or with communication devices, for example a TCU (Telematic Control Unit), for example via a communication bus or through dedicated input / output ports.

[0096] According to a particular and non-limiting embodiment, the device 3 comprises a block 32 of interface elements for communicating with external devices. The interface elements of the block 32 comprise one or more of the following interfaces: - radio frequency RF interface, for example of the Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or of the Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or of the Sigfox type using UBN (Ultra Narrow Band) radio technology, or LoRa in the 868 MHz frequency band, LTE (Long-Term Evolution), LTE-Advanced; - USB interface (from the English "Universal Serial Bus" or "Universal Serial Bus" in French); - HDMI interface (from the English "High Definition Multimedia Interface", or "High Definition Multimedia Interface" in French); - LIN interface (from the English "Local Interconnect Network", or in French "Réseau interconnecté local").

[0097] According to another particular and non-limiting embodiment, the device 3 includes a communication interface 33 which enables communication with other devices (such as other computers in the embedded system) via a communication channel 330. The communication interface 33 corresponds by example to a transmitter configured to transmit and receive information and / or data via communication channel 330. Communication interface 33 corresponds for example to a wired network of type CAN (from the English "Controller Area Network" or in French "Réseau de contrôlers"), CAN FD (from the English "Controller Area Network Flexible Data-Rate" or in French "Réseau de contrôlers à débit de données flexible"), FlexRay (standardized by the ISO 17458 standard) or Ethernet (standardized by the ISO / IEC 802-3 standard).

[0098] According to a particular and non-limiting embodiment, the device 3 can provide output signals to one or more external devices, such as a projection system 340 (corresponding for example to the projector 24), a drive element 350 (corresponding for example to the electric motor 25) and / or other peripherals 360 (screens, speakers) via output interfaces 34, 35 and 36 respectively. According to a variant, one or more of the external devices is integrated into the device 3.

[0099] Figure 4 illustrates a flowchart of the different steps in a method for controlling a multiplane head-up vision system of an electric vehicle, for example the multiplane HV system 2 of the electric vehicle 10, according to a particular and non-limiting embodiment of the present invention. The method is implemented, for example, by a control device embedded in the vehicle 10, for example the device 3 of Figure 3.

[0100] In a first step 41, a minimum amount of electrical energy required to reach or maintain a first determined speed setpoint is determined during an acceleration phase of the electric vehicle as a function of a slope of a portion of road traveled by the electric vehicle, current meteorological data and at least one intrinsic characteristic of the electric vehicle and an acceleration curve is determined during this acceleration phase of the electric vehicle as a function of a speed to reach or maintain the first speed setpoint.

[0101] In a second step 42, a maximum amount of electrical energy to be recovered via an electric vehicle electrical energy regeneration system is determined during a deceleration phase of the electric vehicle as a function of a distance between the electric vehicle and an object detected in front of the electric vehicle, a speed of the electric vehicle at the time of object detection and a second set speed associated with object detection and a deceleration curve is determined during this deceleration phase of the electric vehicle as a function of the speed to obtain the maximum amount of electrical energy.

[0102] In a third step 43, a score representative of a ratio between, on the one hand, a quantity of electrical energy expended during the acceleration phase and / or a the amount of electrical energy recovered during the deceleration phase and on the other hand the minimum amount of electrical energy and / or the maximum amount of electrical energy is determined.

[0103] In a fourth step 44, the multiplane VTH system is controlled to distribute a display of a first graphic content representing the score, a second graphic content representing an acceleration instruction and a third graphic content representing a deceleration instruction on the first, second and third image planes according to the score and a current phase corresponding to the acceleration phase or the deceleration phase.

[0104] According to one variant, the variants and examples of the operations described in relation to one of Figures 1 and 2 apply to the steps of the process in [Fig.4].

[0105] Of course, the present invention is not limited to the embodiments described above but extends to a method for controlling the display of a set of graphic content in a set of image planes, which would include secondary steps without departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

[0106] The present invention also relates to a multiplane VTH system for a vehicle comprising device 3 of [Fig.3] as well as an electric vehicle, for example automobile, comprising the multiplane VTH system or device 3 of [Fig.3].

Claims

1. Demands Method for controlling a multi-plane head-up vision system (2), referred to as the multi-plane HV system, of an electric vehicle (10), said multi-plane HV system (2) being configured for displaying images in a plurality of image planes (201, 202, 203) comprising a first image plane (201) at a first distance from a viewpoint (20) associated with a driving position of said electric vehicle (10), a second image plane (202) at a second distance from said viewpoint (20) greater than the first distance and a third image plane (203) at a third distance from said viewpoint (20) greater than the second distance, said method being implemented by at least one processor and comprising the following steps: - during an acceleration phase of said electric vehicle (10), determination (41) of a minimum quantity of electrical energy required to reach or maintain a first speed setpoint determined as a function of at least a slope of at least a portion of road taken by said electric vehicle (10), current meteorological data and at least one intrinsic characteristic of said electric vehicle (10) and determination (41) of an acceleration curve as a function of a speed to reach or maintain said first speed setpoint; - during a deceleration phase of said electric vehicle (10), determination (42) of a maximum quantity of electrical energy to be recovered via an electrical energy regeneration system of said electric vehicle (10) as a function of a distance between said electric vehicle (10) and an object detected in front of said electric vehicle (10), of a speed of said electric vehicle (10) when detecting said object and of a second set speed associated with said detection of said object and determination (42) of a deceleration curve as a function of speed to obtain said maximum quantity of electrical energy; - determination (43) of a score representative of a ratio between, on the one hand, a quantity of electrical energy expended during the acceleration phase and / or a quantity of electrical energy recovered during the deceleration phase and, on the other hand, said quantity of energy minimum electrical and / or said maximum quantity of electrical energy; - control (44) of said multiplane VTH system (2) to distribute a display of a first graphic content representing said score, a second graphic content representing an acceleration instruction and a third graphic content representing a deceleration instruction on said first, second and third image planes (201, 202, 203) according to said score and a current phase corresponding to the acceleration phase or the deceleration phase.

2. A method according to claim 1, wherein said first graphic content is displayed in said first image plane (201) when said score is greater than a threshold.

3. Method according to claim 2, wherein said second graphic content is displayed in said first image plane (201) when said score is below said threshold and when the current phase corresponds to the acceleration phase.

4. Method according to claim 2 or 3, wherein said third graphic content is displayed in said first image plane (201) when said score is below said threshold and when the current phase corresponds to the deceleration phase.

5. A method according to any one of claims 1 to 4, wherein said at least one slope is determined from mapping data or data received from a gyroscope mounted in said electric vehicle (10).

6. A method according to any one of claims 1 to 5, wherein said at least one intrinsic characteristic belongs to a set of characteristics comprising: - an air penetration coefficient of the electric vehicle (10); - a mass of the electric vehicle (10); - a power of a motor of the electric vehicle (10); - a mass distribution of the electric vehicle (10).

7. A method according to any one of claims 1 to 6, wherein said acceleration curve and said deceleration curve are determined by an adaptive speed control system embedded in said electric vehicle (10).

8. Computer program comprising instructions for carrying out the method according to any one of claims 1 to 7, when such instructions are executed by at least one processor.

9. Device (3) for controlling a multiplane head-up vision system of an electric vehicle, said device (3) comprising a memory (31) associated with at least one processor (30) configured for carrying out the steps of the method according to any one of claims 1 to 7.

10. Electric vehicle (10) comprising device (3) according to claim 9.

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