Method of operating a display device of a motor vehicle equipped with a trailer.

Abstract

Method of operating a display device of a motor vehicle equipped with a trailer.Method of operating a display device of a vehicle equipped with a trailer and a means for measuring a current longitudinal speed of the vehicle, comprising an iteration on • a step of determining an absolute value of a current longitudinal speed of the vehicle, by the measuring means, • a step of determining a current abscissa representing the absolute value of the current longitudinal speed of the vehicle on an axis, • a step of determining a display mode of each segment of the first set as a function of the current abscissa, the display mode of a given segment being o not colored if the abscissa is strictly less than the lower limit of the given segment, or o entirely colored if the abscissa is strictly greater than the upper limit of the given segment, otherwise o colored only on a portion between the lower limit of the given segment and the abscissa. Figure for the abstract: 7.

Description

Title of the invention: Method of operating a display device of a motor vehicle equipped with a trailer.

[0001] The invention relates to a method for operating a display device of a vehicle equipped with a trailer. The invention also relates to a display device implementing such a method. The invention also relates to a vehicle equipped with such a device.

[0002] When a motor vehicle is equipped with a trailer, reversing maneuvers are generally complex and counterintuitive. Maneuvering assistance systems are now available on certain vehicles.

[0003] However, these maneuvering assistance systems have drawbacks.

[0004] The aim of the invention is to provide a parking device and method which overcomes the above drawbacks and improves the parking devices and methods known from the prior art. In particular, the invention makes it possible to produce a device and method which are simple and reliable and which facilitate maneuvering.

[0005] To this end, the invention relates to a method for operating a display device of a motor vehicle equipped with a trailer and a means for measuring a current longitudinal speed of the motor vehicle, the display device comprising a first graphic element in the form of a bar extending along a first axis and intended to represent a current absolute value of a longitudinal speed of the motor vehicle, the first graphic element being broken down into a first set of N contiguous segments extending along the first axis, N being strictly greater than 1, each limit between two contiguous segments of the first set representing an absolute value of a longitudinal speed threshold taken from a second set of N1 thresholds of strictly increasing absolute values ​​of longitudinal speeds,the operating method comprising an iteration over the following steps: - a first step of determining an absolute value of a current longitudinal speed of the motor vehicle, by the measuring means, - a second step of determining a current abscissa representing the absolute value of the current longitudinal speed of the motor vehicle on the first axis, - a third step of determining a display mode for each segment of the first set as a function of the current abscissa, the display mode for a given segment being uncolored if the current abscissa is strictly less than the lower limit of the given segment, or, fully colored if the current abscissa is strictly greater than the upper limit of the given segment, otherwise colored only on a portion between the lower limit of the given segment and the current abscissa.

[0006] In one embodiment, a different color is assigned to each segment of the first set.

[0007] In one embodiment, the first set comprises first, second and third segments ordered along the first axis, the second set comprising first and second thresholds defined such that the first segment is intended to represent a first range of absolute values ​​of longitudinal speeds with a low risk of causing a loss of control on a path of the trailer, the first range extending between 0 and the first threshold, the second segment is intended to represent a second range of absolute values ​​of longitudinal speeds with a moderate risk of causing a loss of control on the path of the trailer, the second range extending between the first threshold and the second threshold, the third segment is intended to represent a third range of absolute values ​​of longitudinal speeds with a high risk of causing a loss of control on the path of the trailer,the third range extending beyond the second threshold.

[0008] In one embodiment, a first color, in particular the color green, is assigned to the first segment, a second color, in particular the color yellow, is assigned to the second segment and a third color, in particular the color red, is assigned to the third segment.

[0009] In one embodiment, the operating method comprises an initial step of determining the second set of thresholds as a function of a distance separating an axle axis of the trailer from a pivot point connecting the trailer to the motor vehicle.

[0010] In one embodiment, the display device comprises a second graphic element in the form of a bar extending along a second axis, in particular perpendicular to the first axis, intended to represent a current absolute value of a given angle formed between a longitudinal axis of the motor vehicle and an axle of the trailer, the operating method further comprising a fourth step of determining the current absolute value of the given angle, a fifth step of determining a color of the second graphic element as being a first color, in particular the color green, if the current absolute value of the given angle is strictly less than a given angle threshold, otherwise as being a second color, in particular the color red.

[0011] In one embodiment, the display device comprises means for displaying on a screen an image originating from a perception means arranged at the rear of the motor vehicle, the operating method comprising a display of the first graphic element superimposed on the image.

[0012] In one embodiment, the method of operation further comprises displaying the second graphical element superimposed on the image.

[0013] The invention further relates to a display device for a motor vehicle equipped with a trailer, the display device comprising hardware and / or software elements implementing the operating method according to the invention, in particular hardware and / or software elements designed to implement the method according to the invention, and / or the device comprising means for implementing the method according to the invention.

[0014] The invention also relates to a motor vehicle comprising a display device according to the invention.

[0015] The invention also relates to a computer program product comprising program code instructions recorded on a computer-readable medium for implementing the steps of the method according to the invention when said program operates on a computer or computer program product downloadable from a communication network and / or recorded on a data medium readable by a computer and / or executable by a computer, and comprising instructions which, when the program is executed by the computer, lead the latter to implement the method of the invention.

[0016] The invention also relates to a computer-readable data recording medium on which is recorded a computer program comprising program code instructions for implementing the method according to the invention or a computer-readable recording medium comprising instructions which, when executed by a computer, cause the latter to implement the method according to the invention.

[0017] The invention also relates to a signal of a data medium, carrying the computer program product according to the invention.

[0018] The attached drawing represents, by way of example, an embodiment of an operating method according to the invention and an embodiment of an operating method according to the invention.

[0019] [Fig.l] represents an embodiment of a display device according to the invention.

[0020] [Fig.2] illustrates calculation parameters of a geometric and kinematic model applied to a motor vehicle equipped with a trailer.

[0021] [Fig.3] is a graph of the evolution of a longitudinal speed limit of the motor vehicle as a function of a length measured between a pivot point of the trailer and an axle axis of the trailer.

[0022] [Fig.4] is a first illustration of a display device implementing an operating method according to the invention.

[0023] [Fig.5] is a second illustration of a display device implementing an operating method according to the invention.

[0024] [Fig.6] is a third illustration of a display device implementing an operating method according to the invention.

[0025] [Fig.7] is a flowchart of an operating method according to the invention.

[0026] An embodiment of a motor vehicle 10 equipped with a device display implementing a method of operating a display device is described below with reference to [Fig.l].

[0027] The motor vehicle 10 is a motor vehicle of any type, in particular a passenger vehicle or a utility vehicle. This vehicle comprises a coupling system 101 comprising a coupling ball whose center is called pivot point A. The coupling ball is a ball joint connection means between the vehicle 10 and a trailer 20 attached to this coupling ball.

[0028] With reference to [Fig.2], a geometric and kinematic model applied to the motor vehicle 10 equipped with the trailer 20 is described.

[0029] The vehicle 10 has a longitudinal axis of symmetry 100 oriented towards the front of the vehicle 10. The pivot point A is positioned substantially on the longitudinal axis of symmetry 100.

[0030] The trailer 20 comprises a hitch bar 201 and an axle 202. A first end of the hitch bar 201 may be connected to the axle 202 of the trailer. According to one embodiment, the hitch bar 201 may be a drawbar (its second end having a single point of attachment with the axle 202) or a tongue (its second end having two points of attachment with the axle of the trailer). Other embodiments of the hitch bar 201 may be envisaged. The axis of the trailer 200 is defined as being an axis perpendicularly intersecting the axle 202 of the trailer in its middle. When the trailer 20 is attached to the vehicle 10, a second end of the hitch bar 201 of the trailer makes a pivot connection with the hitch ball of the vehicle 10, around the pivot point A. In this configuration, the axis of the trailer 200 passes through the pivot point A and is oriented towards the vehicle 10.

[0031] A first angle<e>oriented is measured between the 100 axis of the vehicle and the 200 axis of the trailer. A second oriented angle δ is measured between the 100 axis of the vehicle and a direction 110 of the vehicle's steered wheels.

[0032] [Fig.2] further represents the lengths L1 and L2, which are structural constants of the vehicle 10: - length L1 is the wheelbase of the vehicle 10, - length L2 is the length measured between the center of the rear axle 102 of the vehicle 10 and the pivot point A.

[0033] The length L3 represents the distance separating the pivot point A from the axle axis 202 of the trailer 20. In other words, in the example described, the length L3 represents the length of the projection of the attachment bar 201 on the axis 200. In the remainder of the document, it is assumed that the length L3 is known.

[0034] As a note, the trailer may possibly comprise several axle axes, in particular when the trailer is intended to transport large loads. In this case, the axle axis 202 of the trailer may be defined as a virtual axis of the trailer. In the event that the trailer comprises two parallel axle axes, this virtual axis could be positioned substantially in the middle of these two axes.

[0035] [Fig.2] also represents the longitudinal speed VGv of the vehicle 10 measured at the center Gv of the rear axle of the vehicle, that is to say the projection on the longitudinal axis 100 of the speed vector measured at the center Gv of the rear axle of the vehicle.

[0036] When reversing a vehicle equipped with a trailer, two conditions are necessary to control the trajectory of the trailer, - a first condition Cl relating to the longitudinal speed VGV of the vehicle 10, which must be less than a speed threshold S_VLj, the threshold S_VL_j depending on the length L3, and - a second condition C2 relating to the steering angle 5 of the vehicle's steered wheels, which must be between a minimum value 5min and a maximum value ^max- For example, the minimum value ômin could be equal to -38 degrees and the maximum value Ômax could be equal to +38 degrees.

[0037] The first condition Cl is illustrated in particular by graph G1 of [Fig.3], in which: - the abscissa axis represents the length L3 in meters, and - the ordinate axis represents a longitudinal speed limit VGV of vehicle 10.

[0038] The second condition C2 also results in a constraint relating to the value of the angle & measured between the axis of the motor vehicle and the axis of the trailer, since, according to the formula Math 1, the minimum and maximum values ​​ômilt determine minimum and maximum limits, relative to the angle $.

[0039] [Math.l] mm .tcrniS™™) . / X3 .taKSwaï —. + = I —----—- I -r ÆOT k jG / \

[0040] The motor vehicle 10 comprises a display device 1 intended to facilitate a reversing maneuver of the motor vehicle 10 equipped with a trailer 20.

[0041] For this purpose, the display device 1 comprises - a first graphic element EG_1 intended to facilitate the management of the first condition Cl, and, optionally - a second graphic element EG_2 intended to facilitate the management of the second condition C2.

[0042] In other words, in a display device according to the invention, - the first graphic element EG_1 aims to facilitate the maintenance of the longitudinal speed of the vehicle below a maximum longitudinal speed threshold, and, optionally - a second graphic element EG_2 aims to facilitate the maintenance of the angle & (measured between the axis 100 of the motor vehicle 10 and the axis 201 of the trailer 20 of the vehicle) below a maximum threshold.

[0043] An embodiment of the first graphic element EG_1 is illustrated by Figures 4 to 6. Figures 4 to 6 represent a display device 1 according to the invention, that is to say comprising a first graphic element EG_1.

[0044] The first graphic element EG_1 is in the form of a bar B1 extending along a first axis X. It is intended to represent a current absolute value VL_c of a longitudinal speed of the motor vehicle 10. Figures 4 to 6 illustrate embodiments in which the first axis X is a horizontal axis oriented from left to right.

[0045] The first graphic element EG1 is decomposed into a first set ENS1 of N contiguous segments S_i extending along the first axis X, N being strictly greater than 1, each limit between two contiguous segments of the first set ENS1 representing an absolute value of a threshold S_VLj of longitudinal speed taken from a second set ENS2 of Nl thresholds of absolute values ​​of strictly increasing longitudinal speeds.

[0046] For example, in Figures 4 to 6, the number of segments N is equal to 3. The first set ENS1 comprises a first, a second and a third segments S_l, S_2, S_3 ordered along the first axis X.In addition, the second set ENS2 comprises a first and a second threshold S_VL_1, S_VL_2 defined so that: - the first segment S_1 represents a first range of absolute values ​​of longitudinal speeds with a low risk of causing a loss of control on a trajectory of the trailer, the first range extending between the value 0 and the first threshold S_VL_1, - the second segment S_2 represents a second range of absolute values ​​of longitudinal speeds with a moderate risk of causing a loss of control on the trajectory of the trailer, the second range extending between the first threshold S_VL_1 and the second threshold S_VL_2, - the third segment S_3 corresponds to a third range of absolute values ​​of longitudinal speeds with a high risk of causing a loss of control on the trajectory of the trailer, the third range extending beyond the second threshold S_VL_2.

[0047] In the remainder of the document, an embodiment is described in which the graphic element EG_1 comprises three segments S_1, S_2, S_3.

[0048] A different color is advantageously associated with each segment. For example, in an embodiment more specifically visible in [Fig.5], the green color is assigned to the first segment S_1, the yellow color is assigned to the second segment S_2 and the red color is assigned to the third segment S_3.

[0049] In the remainder of the document, for a given segment S_l, S_2, S_3, we call - "lower end" of the given segment the end of the given segment whose abscissa is (along the first axis X) the smallest, - "upper end" of the given segment the end of the given segment whose abscissa is (along the first axis X) the largest.

[0050] In an embodiment illustrated by [Fig.4], vertical markers R_VL_1, R_VL2 are arranged on the X axis to materialize the thresholds S_VL_1, S_VL2. In particular, two vertical lines R_VL_1, R_VL2 intersect the bar B1 formed by the graphic element EG1 respectively at the abscissas S_VL_1, S_VL2. Thus - the upper end of the first segment S_1 and the lower end of the segment S_2 are merged with the marker R_VL_1, and - the upper end of the first segment S_2 and the lower end of the segment S_3 are merged with the marker R_VL_2.

[0051] Advantageously, - the vertical line materializing the R_VL_1 marker is the color assigned to the S_2 segment, the R_VL_1 marker thus materializing the start of the second range of values absolute longitudinal speeds with moderate risk of causing loss of control on the trajectory of the trailer, and - the vertical line materializing the R_VL_2 mark is the color assigned to the S_3 segment, the R_VL_2 mark thus materializing the start of the third range of absolute values ​​of longitudinal speeds with a high risk of causing a loss of control on the trajectory of the trailer.

[0052] The display device 1 mainly comprises the following elements: - a microprocessor 2, - a screen 3, - a means of determining 4 the angle <e>formed between the axis of the trailer 200 and the longitudinal axis of symmetry 100 of the motor vehicle, - a determination means 5 measuring the longitudinal speed VGv of the vehicle, - a perception means 6, for example a camera 6, arranged at the rear of the vehicle so as to capture images of the pivot point A between the motor vehicle 10 and the trailer 20.

[0053] In one embodiment, the display device 1 may further comprise means 7 for displaying an image 30 originating from a perception means 8 arranged at the rear of the motor vehicle 10, and means 9 for superimposing the first graphic element EG_1 and / or the second graphic element EG_2 on the image 30 originating from the perception means 8.

[0054] The means 4 for determining the angle <e>can be provided by a specific Hall effect sensor. This sensor can be driven by the rotation of the trailer. Alternatively, the angle <e>can be calculated by processing images from a rear camera. The use of reversing radars is also a possible alternative for calculating the angle <e>by detecting a free space located at the rear of the vehicle.

[0055] The display device 1, and particularly the microprocessor 2 enabling the implementation of a method of operating the display device, mainly comprises the following modules: - a module 20 for determining the second set of longitudinal speed thresholds as a function of the length L3, - a module 21 for determining an absolute value of a current longitudinal speed of the motor vehicle, this module being able to cooperate with the determination means 5, - a module 22 for determining a current abscissa representing the absolute value of the current longitudinal speed on a first axis, - a module 23 for determining a display mode for each segment of the first set as a function of the current abscissa, - a module 24 for determining a current absolute value <p_c d’un angle donné formé entre l’axe longitudinal du véhicule automobile et l’essieu de la remorque, - un module 25 détermination mode d’affichage deuxième élément graphique en fonction d’une valeur absolue courante <p_c l’angle , 26 premier graphique, ce pouvant collaborer avec les moyens 7, le moyen perception 8 superposition 9.

[0056] The motor vehicle 10, in particular the display device 1, preferably comprises all the hardware and / or software elements configured so as to implement the method defined in the subject of the invention or the method described below.

[0057] An embodiment of the parking method is described below with reference to Figures 4 to 7. In the embodiment represented by Figures 4 to 7, the method comprises seven steps E0 to E6.

[0058] In the initial step E0, the second set of thresholds ENS2 is determined as a function of a distance L3 separating the axle axis 202 of the trailer 20 from a pivot point A connecting the trailer 20 to the motor vehicle 10.

[0059] For this, the graph Gl is used, which associates with the distance L3 a limit value M_ VL of an absolute value of the longitudinal speed VGv of the motor vehicle 10, beyond which there is a risk of loss of control over the trajectory of the trailer 20.

[0060] The limit value M_VL makes it possible to determine the second set of thresholds ENS2 of thresholds. In one embodiment, the set ENS2 comprises two thresholds, - the second threshold S_VL_2 being equal to M_VL, - and the first threshold S_VL_1 being strictly lower than S_VL_2.

[0061] For example, the first threshold S_VL_1 can be equal to the product of S_VL_2 by a multiplicative factor F strictly less than 1, for example F being equal to 0.9 or 0.8.

[0062] Then, in step E1, using the data provided by the determination means 5, the current longitudinal speed VL_c of the motor vehicle 10 is determined.

[0063] Then, in step E2, a current abscissa A_VL_c is determined representing the absolute value of the current longitudinal speed VL_c on the first axis X,

[0064] Then we continue with step E3 of determining a display mode for each segment S_l, S_2, S_3 of the first set ENS1 as a function of the current abscissa A_VL_c.

[0065] A display mode of a segment can be: - a display mode called “non-colored”, this mode being illustrated in [Fig.4], by segments S_2 and S_3, - a display mode called “fully colored”, this mode being illustrated in [Fig.5], by segments S_1 and S_2, - a display mode called “partially colored”, this mode being illustrated in [Fig.4], by the segments S_l, and in [Fig.5], by the segment S_3.

[0066] To this end, for each segment S_l, S_2, S_3, we compare the current abscissa A_VL_c to the lower limit and the upper limit of the segment: - if the current abscissa A_VL_c is strictly less than the lower bound of the segment, the segment display mode is not colored, otherwise - if the current abscissa A_VL_c is strictly greater than the upper bound of the segment, the segment display mode is fully colored, otherwise - the segment display mode is partially colored, that is to say that the segment is colored only on a portion between the lower limit of the segment and the current abscissa A_VL_c.

[0067] For example, in [Fig.5], the current abscissa A_VL_c is strictly greater than the upper bound of the segments S_1 and S_2, which are therefore entirely colored. On the other hand, the current abscissa A_VL_c is located between the upper bound and the lower bound of the segment S_3: the segment S_3 is therefore colored only on a portion between the lower bound of the segment and the current abscissa A_VL_c.

[0068] We then continue with step E4 in which we determine the current absolute value of the given angle using the determination means 4.

[0069] Then we continue with step E5 in which we determine a display color of the second graphic element EG_2 as being a first color, in particular green, if the current absolute value of the given angle $ is strictly less than a given angle threshold (b , otherwise as being a second color, in particular red.

[0070] In one embodiment, the value of the threshold (b) is a constant value. In particular, the value of the threshold 0 can be calculated as a function of the geometric characteristics of the trailer 20 and / or the vehicle 10. Alternatively, the value of the threshold $ could be variable, and depend in particular on a longitudinal speed of the motor vehicle.

[0071] Then we continue with the display step E6.

[0072] Step E6 comprises a display of the first graphic element EG_1 on the display device 1. In one embodiment, the first graphic element EG_1 is arranged horizontally at a lower limit of the screen 3 of the device 1.

[0073] Step E6 may further comprise a display of the second graphic element EG_2 on the display device 1. In one embodiment, the second graphic element EG_2 is arranged vertically on a lateral boundary of the screen 3 of the device 1, as illustrated by [Fig.6].

[0074] The display device 1 may further comprise means 7 for displaying an image 30 originating from a perception means 8 arranged at the rear of the motor vehicle 10. In this case, an image showing the pivot point A and the angular position of the trailer 20 may be displayed on the screen 3 of the display device 1. Advantageously, the first graphic element EG_1 is then superimposed on the image 30. Optionally, the second graphic element EG_2 is also superimposed on the image 30.

[0075] Then we loop back to step El.

[0076] Finally, the method according to the invention makes it possible to visualize the parameters which have the greatest impact on the progress of reversing when the motor vehicle 10 is equipped with a trailer.

[0077] The longitudinal (reverse) speed of the motor vehicle 10 is materialized by the first graphic element EG_1 in the form of a horizontal gauge. Vertical markers R_VL_1, R_VL_2 arranged on two distinct abscissae of the gauge provide reference points intended for the driver.

[0078] As long as the gauge has not reached the first R_VL_1 mark, this means that the longitudinal speed of the vehicle is within a range of values ​​that favors the success of the maneuver. The gauge is then a single color, green.

[0079] When the gauge reaches the first mark R_VL_1, this means that the speed longitudinal speed of the vehicle leaves a range of values ​​favoring the success of the maneuver. The gauge then comprises a first portion of green gauge between the abscissas 0 and S_VL_1, and a second portion of yellow gauge between the first mark R_VL_1 and the abscissa corresponding to the current longitudinal speed VL_c of the motor vehicle 20.

[0080] When the gauge reaches the second mark R_VL_2, this means that the speed longitudinal axis of the vehicle enters a range of values ​​compromising the success of the maneuver. The gauge then includes a green portion between abscissas 0 and S_VL_1, then a yellow portion between the first and second marks R_VL_1, R_V_L2, then a red portion beyond the second mark R_V_L2.

[0081] In addition, the color - green or red - of the second graphic element EG2 allows the driver to monitor whether the angle between the vehicle and the trailer is favorable to the success of the maneuver, and to reduce this angle if necessary.

[0082] Thus, the first and second graphic elements provide the driver with an assessment of the maneuver in progress, which is intuitive (in particular thanks to the representation of the speed in the form of a gauge and the colors used) and which allows a rapid understanding of the situation. The driver can then react as soon as possible to restore the situation when necessary, by reducing the speed of the vehicle and / or by reducing the angle between the vehicle and the trailer. < / e> < / e> < / e> < / e> < / e>

Claims

Claims

1. Method of operating a display device (1) of a motor vehicle (10) equipped with a trailer (20) and a means (5) for measuring a current longitudinal speed of the motor vehicle (10), the display device comprising a first graphic element (EG_1) in the form of a bar (Bl) extending along a first axis (X) and intended to represent a current absolute value (VL_c) of a longitudinal speed of the motor vehicle (10), the first graphic element (EG1) being decomposed into a first set (ENS1) of N contiguous segments (S_i) extending along the first axis (X), N being strictly greater than 1, each limit between two contiguous segments of the first set (ENS1) representing an absolute value of a threshold (S_VLj) of longitudinal speed taken from a second set (ENS2) of Nl thresholds of absolute values ​​of strictly increasing longitudinal speeds,the operating method being characterized in that it comprises an iteration over the following steps:, a first step (El) of determining an absolute value of a current longitudinal speed (VL_c) of the motor vehicle, by the measuring means (5), a second step (E2) of determining a current abscissa (A_VL_c) representing the absolute value of the current longitudinal speed (VL_c) of the motor vehicle (10) on the first axis (X), a third step (E2) of determining a display mode of each segment of the first set (ENS1) as a function of the current abscissa (A_VL_c), the display mode of a given segment (Sj) being • not colored if the current abscissa (A_VL_c) is strictly less than the lower bound of the given segment (S_VLj), or • fully colored if the current abscissa (A_VL_c) is strictly greater than the upper bound of the given segment (S_VLj), otherwise • colored only on a portion between the lower limit of the given segment (S_VLj) and the current abscissa (A_VL_c).

2. Operating method according to the preceding claim, characterized in that a different color is assigned to each segment (Sj) of the first set (ENS_1).

3. Operating method according to one of the preceding claims, characterized in that the first set (ENS1) comprises a first, a second and a third segment (S_l, S_2, S_3) ordered along the first axis (X), the second set (ENS2) comprising a first and a second threshold (S_VL_1, S_VL_2) defined so that • the first segment (S_l) is intended to represent a first range of absolute values ​​of longitudinal speeds with a low risk of causing a loss of control on a trajectory of the trailer, the first range extending between 0 and the first threshold (S_VL_1), • the second segment (S_2) is intended to represent a second range of absolute values ​​of longitudinal speeds with a moderate risk of causing a loss of control on the trajectory of the trailer, the second range extending between the first threshold (S_VL_1) and the second threshold (S_VL_2),• the third segment (S_3) is intended to represent a third range of absolute values ​​of longitudinal speeds with a high risk of causing a loss of control on the trajectory of the trailer, the third range extending beyond the second threshold (S_VL_2).,

4. Operating method according to the preceding claim, characterized in that a first color, in particular the green color, is assigned to the first segment (S_l), a second color, in particular the yellow color, is assigned to the second segment (S_2) and a third color, in particular the red color, is assigned to the third segment (S_3).

5. Operating method according to the preceding claim, characterized in that it comprises an initial step (EO) of determining the second set of thresholds (ENS2) as a function of a distance (L3) separating an axle axis (202) of the trailer (200) from a pivot point (A) connecting the trailer (20) to the motor vehicle (10).

6. Operating method according to one of the preceding claims, the display device (1) comprising a second graphic element (EG_2) in the form of a bar extending along a second axis (Y), in particular perpendicular to the first axis (X), intended to represent a current absolute value of a given angle formed between a longitudinal axis (100) of the motor vehicle (10) and an axis (200) of the trailer (20), characterized in that it further comprises • a fourth step (E4) of determining the current absolute value of the given angle, • a fifth step (E5) of determining a color of the second graphic element (EG_2) as being a first color, in particular the color green, if the current absolute value (¢) of the given angle is strictly less than a given angle threshold (0 ), otherwise as being a second color, in particular the color red.

7. Operating method according to one of the preceding claims, the display device comprising display means (7) on a screen (3) of an image (30) originating from a perception means (8) arranged at the rear of the motor vehicle (10), characterized in that it comprises a display (E6) of the first graphic element (EG_1) superimposed on the image (30).

8. Operating method according to claims 6 and 7, characterized in that it further comprises a display of the second graphic element (EG_2) superimposed on the image (30).

9. Device (1) for displaying (10) a motor vehicle (100) equipped with a trailer (200), the display device (1) comprising hardware and / or software elements (2, 3, 4, 5, 6, 7, 8, 9, 20, 21, 22, 23, 24, 25, 26) implementing the operating method according to one of claims 1 to 8.

10. Motor vehicle (10) comprising a display device (1) according to the preceding claim.

Images