METHOD FOR SCANNING PRESENCE INSIDE A LOCKED VEHICLE, ASSOCIATED SCANNING DEVICE AND SYSTEM

Abstract

The invention relates to a method for scanning for presence inside a vehicle, by a scanning device comprising at least one internal module and at least one external ultra-wideband transmission and reception module, capable of locating a portable “hands-free” access device carried by a user. According to the invention, the device is equipped with Ultra High Frequency communication means with said equipment and the method performs: a) Detection of the locking of the vehicle, b) For a predetermined duration: i) Scanning for a presence inside the vehicle with the internal module, ii) Simultaneously, transmission to the equipment of a request to detect a U-turn by the user, iii) If a U-turn signal is received, stopping the scanning and determining the position of the user with the two modules, iv) If there is detection of presence inside the vehicle, then stopping the scanning and transmission of an alert,c) at the end of the duration, if there is no reception of a U-turn signal, nor detection of presence, then the position of the user is determined with the two modules. Figure for the abstract: Fig. 5,

Description

Title of the invention: METHOD FOR SCANNING PRESENCE INSIDE A LOCKED VEHICLE, ASSOCIATED SCANNING DEVICE AND SYSTEM Technical field

[0001] The invention relates to a method for scanning for presence inside a vehicle which has been previously locked, a scanning device and an associated system. The invention is particularly applicable to the detection of young children, or a baby who may have been forgotten in the rear seats when the driver left the vehicle and locked it. Prior art

[0002] New automotive standards are emerging and now require manufacturers to detect a child aged 0 to 6 years in a vehicle, for 10 seconds after the vehicle is locked, this is the case for example with the "EuroNCAP" standard. This standard is divided into three levels, a first level which triggers the horn and the activation of the vehicle's headlights in the event of detection, a second level, which triggers the sending of a notification to the driver's telephone, and finally a third level which triggers an emergency call, i.e. an "e-call" ("emergency call" in English) emitted by the vehicle.

[0003] To warn the driver of the presence of a young child or a baby in a rear seat of a motor vehicle, several methods or devices of the prior art are known.

[0004] The majority of methods use dedicated sensors, for example a sensor on the rear seat belt, which detects that the belt is fastened, or infrared or radar sensors making it possible to detect the presence of an “object” on the rear seat, supplemented by the detection of a breathing movement, or sensors located under the rear seat which detect a weight or a camera which visualizes the environment near the rear seats.

[0005] However, the disadvantages of these dedicated sensors lie in their additional cost to the vehicle and the lack of respect for privacy in the case of use of the camera.

[0006] It is also known to use sensors already existing on the vehicle, for example UWB frequency transmitters / receivers, "Ultra Wide Band" or Ultra Wide Band, which are located on the vehicle in order to allow "hands-free" access to the vehicle and / or "hands-free" starting of the vehicle. These sensors are then used to detect the movement of breathing, i.e. the heart rate of a human located in the vehicle.

[0007] The advantage of using the ultra-wideband band lies in the frequency of the emitted waves which allows the waves to penetrate through clothing.

[0008] However, if the UWB transmitters / receivers are used for scanning or presence detection inside the vehicle, they are then no longer available to perform the "hands-free" access function.

[0009] In this case, during the 10 seconds after the user has locked his vehicle, the UWB transmitters / receivers are dedicated to scanning for presence inside the vehicle and cannot locate the user or follow his trajectory with respect to the vehicle. A priori, the user who leaves his vehicle is supposed to move away from the vehicle. However, the problem arises if he turns around and returns to the vehicle, because he has forgotten an object or precisely to check that he has not forgotten his child.

[0010] In this specific case, since the position of the user is not determined by the UWB transmitters / receivers which are busy performing the presence scanning function inside the vehicle, and which are therefore unavailable to perform the “hands-free” access function, when the user wants to open his vehicle, the door is not unlocked. This is called the “wall” effect, and it lasts the time necessary for the UWB transmitters / receivers to perform the presence scanning inside the vehicle, i.e. at least 10s.

[0011] Possible solutions of the prior art consist of: a. Give priority to one of the two functions, but this is not desirable for the comfort of the user who should not have to choose, b. Use two different UWB frequencies, a frequency at 6.5 MHz (band 5) for vehicle access detection and 8 MHz (band 9) for vehicle interior presence detection, but this solution is not universal, because many countries prohibit the use of two UWB frequency bands (Japan, South Korea, etc.) c. Alternate the operating mode of the transmitters / receivers between the two functions, but this increases the time required to scan for presence inside the vehicle and may exceed the authorized 10 seconds.

[0012] The invention therefore proposes a scanning method; a scanning device and a system overcoming the drawbacks of the prior art, in particular allowing the vehicle to simultaneously perform the two functions, i.e. scanning for presence inside the vehicle, and locating the user around the vehicle for 10 seconds, once the vehicle is locked. The proposed detection method is particularly relevant for detecting a U-turn and a return of the user towards the vehicle. Statement of the invention

[0013] The invention relates to a method for scanning for presence inside a vehicle by a scanning device comprising at least one internal ultra-wideband transmission-reception module capable of transmitting towards the inside of the vehicle and at least one external ultra-wideband transmission-reception module capable of transmitting towards the outside of the vehicle, and capable of locating, a portable “hands-free” access device carried by a user, said method being remarkable in that the scanning device is first equipped with Ultra High Frequency communication means with said equipment and in that the method comprises the following steps: a. Vehicle lock detection, b. For a predetermined period of time, c. Scanning for a presence inside the vehicle using the internal module by emitting ultra-wideband waves, and comparing a profile of waves reflected and received by said internal module with at least one profile of predetermined waves, d. Simultaneously, transmission in Ultra High Frequency to the portable equipment of a request to detect a U-turn of the user, e. If a U-turn signal is received, stopping the scanning and determining the position of the user using the internal module and the external module, f. If a presence is detected inside the vehicle, then the scanning is stopped and an alert is sent to the user, g. Otherwise, at the end of the predetermined duration, if no U-turn signal is received and if no presence is detected inside the vehicle, then the user's position is determined using the internal module and the external module.

[0014] The invention also relates to a method for detecting a U-turn by a user, by portable equipment for “hands-free” access to a vehicle, worn by said user, said equipment being capable of communicating in Ultra High Frequency with the vehicle, and being equipped with a gyroscope, the method being remarkable in that it comprises the following steps: a. Reception by Ultra High Frequency of a U-turn detection request from the vehicle, b. U-turn detection, by measuring the gyroscope values, c. If a U-turn is detected, transmission by said equipment to the vehicle of a U-turn signal.

[0015] Judiciously, upon receipt of a U-turn detection request, a gyroscope value acquisition frequency can be increased.

[0016] Advantageously, a half-turn is detected when the values ​​of the gyroscope present in a predetermined time window a peak of maximum value and a peak of minimum value.

[0017] For example, a ratio between the maximum value and the minimum value is between 0.7 and 1.3.

[0018] According to the scanning method of the invention, if there is detection of presence inside the vehicle, then there is transmission to the portable equipment of a U-turn detection stop signal.

[0019] The scanning method may further comprise the following steps: a. simultaneously with the scanning, a step of determining a distance between the user and the vehicle carried out by the external module, b. If a U-turn signal is received, a step of verifying that values ​​of said distance are representative of a U-turn, c. the scanning being stopped and the determination of the user's position being carried out using the internal module and the external module only if said verification is proven.

[0020] The invention also relates to a scanning device intended to be installed on a motor vehicle comprising at least one internal ultra-wideband transmission and reception module capable of transmitting towards the interior of the vehicle and at least one external ultra-wideband transmission and reception module capable of transmitting towards the exterior of the vehicle, and capable of locating portable “hands-free” access equipment carried by a user, the device being remarkable in that it is equipped with a clock and that it is capable of: a. Communicate with said equipment in Ultra High Frequency, b. Detect vehicle lock, c. Scanning for a presence inside the vehicle using the internal module by emitting ultra-wideband waves, and comparing a profile of waves reflected and received by said module with at least one predetermined wave profile, d. Simultaneously, send to said equipment a request for detection of a user turn, e. Based on a U-turn signal received from the portable equipment or a presence detection inside the vehicle: f. Stop scanning and g. Determine the user's position using the internal module and the external module, h. Issue an alert to the user in the event of detection of presence inside the vehicle.

[0021] The invention also applies to any portable equipment for hands-free access to a vehicle, equipped with a gyroscope and carried by a user, said equipment being remarkable in that it is capable of: a. Communicate in Ultra High Frequency with the vehicle, b. Carry out measurements of gyroscope values, c. Detect whether the gyroscope values ​​are representative of a half-turn by the user, d. Depending on the detection of a U-turn, transmit a U-turn signal to the vehicle.

[0022] The portable equipment may comprise means for increasing a frequency of acquisition of the gyroscope value measurements.

[0023] The portable equipment (includes means for determining peaks of maximum values ​​and peaks of minimum values ​​of the gyroscope values ​​during a predetermined time window.

[0024] The scanning device is, for its part, capable of transmitting a request to stop the gyroscope measurements to the portable equipment depending on the detection of presence inside the vehicle.

[0025] The scanning device is also capable of: a. to determine a distance between the user and the vehicle via the external module, b. Depending on the U-turn signal, to check that values ​​of the said distance correspond to a U-turn, c. to stop scanning and determine the user's position using the internal and external module based on the verification result.

[0026] The invention also relates to any computer program product, comprising program code instructions for executing the steps of the scanning method according to any one and / or for executing the detection method according to any one of the characteristics listed above when said program is executed on a computer.

[0027] The invention applies to any system comprising a scanning device according to any portable “hands-free” access equipment according to any of the characteristics listed above.

[0028] Finally, the invention relates to any motor vehicle comprising a scanning device according to any one of the characteristics listed above. Brief description of the drawings

[0029] Other characteristics and advantages of the invention will become apparent upon reading of the description which follows. This is purely illustrative and must be read in conjunction with the attached drawings in which:

[0030] [Fig. 1]: [Fig.l] schematically represents a motor vehicle comprising a scanning device according to the invention,

[0031] [Fig.2]: [Fig.2] is a graph representing the values ​​of the gyroscope of the portable “hands-free” access equipment according to time illustrating the case of a U-turn, i.e. a return of the user to his vehicle, after having left his vehicle,

[0032] [Fig.3]: [Fig.3] is a graph representing, over time, the distances between the portable hands-free access equipment and the vehicle along the trajectory illustrated in [Fig.4], and estimated by the various ULB transmitters and receivers located on the vehicle using the scanning method according to the invention,

[0033] [Fig.4]: [Fig.4] schematically represents the trajectory of the user making U-turn and returning to his vehicle after leaving it, and the different points on the trajectory whose corresponding distances are illustrated in the graph of [Fig.3],

[0034] [Fig.5]: [Fig.5] is a flowchart representing the scanning process according to the invention,

[0035] [Fig.6]: [Fig.6] schematically represents the scanning system according to the invention, comprising the scanning device and the portable “hands-free” access equipment. Description of the embodiments

[0036] The scanning system SYS according to the invention is illustrated in Figures 1 and 6. The scanning system SYS comprises a scanning device D and portable equipment SD for “hands-free” access to the vehicle V, carried by the user U.

[0037] The scanning device D is on board the motor vehicle V and comprises at least one internal ultra-wideband transmission and reception module II capable of transmitting to the interior of the vehicle V and at least one external module; in the example, two external ultra-wideband transmission and reception modules Ex1, Ex4 will be considered, capable of transmitting to the exterior of the vehicle V, and capable of locating the portable “hands-free” access equipment carried by a user. However, the invention also operates with a single internal module II and a single external module Ex1.

[0038] Ultra Wide Band is a radio modulation technique based on the transmission of very short pulses, often less than a nanosecond. Thus, the bandwidth can reach very high values.

[0039] The ultra-wideband transmission and reception modules each comprise at least one antenna and an electronic unit connected to the antenna and adapted for transmit and receive information in Ultra Wide Band, this is known from the prior art.

[0040] In Figures 1 and 5, a scanning device is illustrated comprising two internal modules II, 12 and four external modules Ex1, Ex2, Ex3, Ex4. Said modules are all connected to a central management unit 10, which receives and processes the information coming from the modules and makes it possible, for example, to locate the portable equipment. The central management unit 10 also makes it possible to manage the transmissions made by the modules.

[0041] According to the invention, the scanning device D is also equipped with means of communication Al in BLE (“Bluetooth Low energy”) with the portable equipment SD, that is to say an antenna Al and a transmission reception unit in BLE, for example integrated in the central management unit 10.

[0042] According to the invention, the scanning device D is also capable of detecting the locking of the vehicle; for this purpose, it is connected to the vehicle management system, which is for example integrated into or connected with the central management unit 10, and can receive a vehicle locking message.

[0043] The device D can also scan for a presence inside the vehicle using at least one internal module II. More particularly, the internal module II emits ultra-wideband waves, and compares a reflected wave profile that it receives with at least one predetermined wave profile. Several wave profiles may have been determined beforehand, with or without presence in the passenger compartment and stored in a memory of the central unit 10.

[0044] The device D can transmit, using the BLE communication means, to said equipment SD a request for detection of a U-turn from the user U, and receive in return, via BLE communication, a U-turn signal received from the portable equipment SD.

[0045] The SD scanning device is also capable of: i. Stop scanning and ii. Determine the position of user U using at least one internal module II, 12 and at least one external module El, E4, when it receives a U-turn signal from the portable equipment or if it has detected a presence inside the vehicle. It can also issue a visual or audible alert to the user if a presence is detected inside the vehicle, such as the vehicle's horn being triggered, or the vehicle's turn signals being activated V.

[0046] When the vehicle is equipped with only one external module Exl, and only one internal module II, the determination of the position of the user can only be done on one side of the vehicle V, for example on the driver's side.

[0047] In an improvement of the invention, the scanning device SD is also capable of transmitting a request to stop the gyroscope measurements to the portable equipment SD as a function of the detection of presence inside the vehicle.

[0048] In a second embodiment of the invention, the SD scanning device is suitable for: a. Determine a distance between user U and vehicle V using the external modules Exl, Ex2, Ex3, Ex4, b. Depending on the U-turn signal, check that the said distance decreases, c. Stop scanning and determine the position of user U using the internal modules II, 12 and external modules Exl..Ex4 depending on the result of the verification.

[0049] The scanning device SD is therefore equipped with software means to perform these functions. For this purpose, the central management unit 10 comprises a processor 100 and a memory 101 in which instructions are recorded for configuring the processor to execute certain particular processes, in particular to implement the steps of the scanning method according to a particular embodiment and as described below.

[0050] As illustrated in [Fig.6], the portable “hands-free” access equipment SD is for example a smartphone equipped with BLE communication means, i.e. an antenna A2 and a BLE transmission and reception unit in order to communicate with the vehicle V and equipped with a gyroscope G.

[0051] According to the invention, the portable equipment SD is equipped with software means, a processor 200, a memory 201 allowing it to: a. Receive a U-turn detection request, b. Carry out measurements of gyroscope values, c. Detect whether the gyroscope values ​​are representative of a U-turn by the user, d. Depending on the detection of a U-turn, transmit a U-turn signal to the vehicle via BLE.

[0052] For this purpose, the portable equipment SD comprises means M1 for determining peaks of maximum values ​​and peaks of minimum values ​​of the values ​​of the gyroscope during a predetermined time window At, as described below.

[0053] The portable SD equipment may also comprise means for increasing the frequency of acquisition of the gyroscope measurements once it has received a U-turn detection request in order to improve the accuracy of U-turn detection.

[0054] The scanning method and the U-turn detection method will now be described.

[0055] During a first step E0, the scanning device receives the information that the vehicle is locked, the central management unit 10 is for example connected to the vehicle's information harness, CAN network or other and receives via this wired network the information that the doors are locked.

[0056] Once the vehicle is locked, a timer is triggered; the device has an internal clock for this purpose. The timer is calibrated for a predetermined duration tmax, for example 10s.

[0057] During said duration and as long as it has not expired (step E1), in a first embodiment, two actions are triggered simultaneously: a. Device D sends a U-turn detection request to the portable equipment SD via BLE (step E3a), and b. The at least one internal module II, in our example, the two internal modules II, 12 are activated in so-called “radar” mode in order to scan the passenger compartment and detect a possible human presence (step E3b). For this purpose, the internal modules emit waves in UWB and compare the profile of the reflected and received waves in return with predetermined profiles, said profiles being representative of the presence or absence of a human in the passenger compartment.

[0058] The hands-free access portable SD equipment receives via BLE the U-turn detection request from the vehicle V. Said SD equipment then triggers the recording of the measurements of the values ​​of its gyroscope G. The SD equipment can also increase its frequency of acquisition of the measurements of the gyroscope G in order to detect a possible U-turn more precisely.

[0059] The values ​​are processed by the internal processor 200, and a half-turn is detected if in a predetermined time window At, the recording has a maximum value peak PI and a minimum value peak P2, this is illustrated in [Fig.2], which represents the values ​​of the gyroscope G measured according to time t.

[0060] If a U-turn is detected (step E4a), then the equipment sends a U-turn signal to the vehicle V via BLE (step E5a).

[0061] Once the U-turn signal has been received, the vehicle V stops scanning for presence inside the vehicle (step E6), and then uses all the internal and external modules Ex1, Ex2, Ex3, Ex4, II, 12 (in the case of only two modules present on the vehicle, then the term: "all modules" means said two modules present) to accurately determine the position of the user outside the vehicle V (step E7). The internal modules II, 12 therefore change from a so-called radar mode to a ULB location mode where the position of the user is determined as a function of a triangularization of the signals received by the modules, and as a function of a time of flight of the signals or other methods known from the prior art.

[0062] Of course, in the case where the vehicle is only equipped with an internal module II and that of an external Exl module, this user localization can only be done on one side of the vehicle V, for example on the driver's side.

[0063] If once the duration has expired, no U-turn is detected (step E4a) and no presence has been detected inside the vehicle, the vehicle then performs the user presence detection function using all the modules (step E7), as explained above (step E7).

[0064] In parallel, and for the predetermined duration of 10s, if there is detection of presence inside the vehicle V, (step E4b), the device D triggers a visual or audible alert (step E5b) to alert the user, for example by turning on the horn or the flashing lights of the vehicle V. The scanning is stopped (step E6), and the vehicle returns to a standard operating mode of locating the user by means of all the modules present on the vehicle V (step E7).

[0065] Similarly, if once the duration has expired, no U-turn is detected (step E4a) and no presence has been detected inside the vehicle, the vehicle performs the user presence detection function using all the modules (step E7), as explained above.

[0066] In a second embodiment of the method of the invention, illustrated in dotted lines in [Fig. 5], once the vehicle V is locked, in addition to triggering the scanning of the passenger compartment and in addition to requesting the portable equipment SD to detect a possible U-turn by the user, the method comprises a step of determining the distance separating the user U from the vehicle V using only the external modules Ex1, Ex2, Ex3, Ex4 (step E3c). Indeed, the external modules are not requested to carry out the scanning step, nor to carry out the U-turn detection step.

[0067] Said external modules Ex1, Ex2, Ex3, Ex4 by transmission reception in ULB thus allow the determination of a distance separating them from the portable equipment SD, this is known to those skilled in the art (step E4c).

[0068] Thus, if the scanning device D receives a U-turn signal from the portable equipment SD, it can verify that the distance values ​​thus determined and stored in its memory and its processor are representative of a U-turn by the user, that is to say a move away then a return towards the vehicle V. Indeed, the distance values ​​will increase when the user moves away, then decrease if the user makes a U-turn and returns towards his vehicle V.

[0069] The U-turn detection carried out by the portable equipment SD can thus be verified by the scanning device D thanks to its external modules.

[0070] If the variation in distance Ad is representative of a U-turn (step E5c) and confirms the U-turn signal received from the portable equipment SD, then the scanning process stops (step E6) and the vehicle performs the user presence detection function using all the modules (step E7), as explained above.

[0071] This is illustrated in Figures 3 and 4. In [Fig.4] eight positions of the user U are shown relative to the vehicle V, S1 to S8, the user leaving his vehicle V then making a U-turn and then returning to his vehicle V.

[0072] The graph in [Fig.3] represents the distance of the user from the vehicle as a function of the signals received by the different modules Ex1, Ex2, Ex3, Ex4, II, 12 for each of its positions and by applying the second embodiment of the scanning method according to the invention.

[0073] During the first phase PHI, all the internal modules II, I2 and external Exl.. .Ex4 are used to perform the function of locating the portable equipment SD. The user is outside the vehicle V, at points SI, S2, S3 and moves away from the vehicle V. The distance measured by the transmitters increases for all the transmitters, with a lower estimated distance for the internal modules (due to the attenuation in the passenger compartment), then the internal modules no longer “see” the user at position S3, the distance is then too great for said internal modules to receive a signal from the equipment.

[0074] From position S3, the user leaves the vehicle unlocking zone ZI, and the vehicle is then automatically locked, as indicated by event “L” in the graph of [Fig.3].

[0075] The vehicle being locked, according to the second embodiment of the method according to the invention, the internal modules II, 12 are then dedicated to scanning for presence in the passenger compartment while the external modules Exl.. .Ex4 are dedicated to estimating the distance between the user and the vehicle. It can be seen during the second phase PH2 that said distance decreases, this corresponding to a half-turn of the user, illustrated by the positions S4, S5, S6, S7 in [Fig.4].

[0076] The vehicle V receives in parallel a U-turn signal that the portable equipment SD sends to it and which has been detected thanks to the processing of the value measurements of its gyroscope G. A U-turn is therefore confirmed, this is represented by the event “R3” in [Fig.3].

[0077] Once the U-turn has been detected, the scanning process stops and all the modules are used again in the third phase PH3 for detecting the user's position. It is thus accurately detected that the user is now at position S8, in front of the door of his vehicle and consequently the driver's door can be automatically unlocked without the user U experiencing the wall effect as in the prior art.

[0078] The invention is therefore ingenious because it makes it possible to simultaneously detect the presence of a human inside the vehicle, and the position of the user outside the vehicle, without assigning priority to one of the two functions which would be to the detriment of the other function and while respecting the 10 seconds imposed by the standard.

[0079] Thanks to the invention, the user no longer runs the risk of being confronted with the wall effect, if he returns to his vehicle, during the 10 seconds after having locked his vehicle. In addition, the function of detecting presence in the passenger compartment, which is a primordial function, is ensured with great robustness.

Claims

Claims

1. Method for scanning for presence inside a vehicle (V), by a scanning device (D) comprising at least one internal ultra-wideband transmission-reception module (II) capable of transmitting towards the inside of the vehicle (V) and at least one external ultra-wideband transmission-reception module (Exl) capable of transmitting towards the outside of the vehicle (V), and capable of locating, a portable “hands-free” access device (SD) carried by a user (U), said method being characterized in that the scanning device (D) is first equipped with Ultra High Frequency (BLE) communication means with said equipment (SD) and in that the method comprises the following steps: a. Detection of vehicle lock (step EO), b. For a predetermined duration (step El): i. Scanning (step E3b) of a presence inside the vehicle (V) using the internal module (II) by emission of ultra-wideband waves, and comparison of a profile of waves reflected and received by said internal module with at least one profile of predetermined waves, ii. Simultaneously, transmission (step E2) in Ultra High Frequency to the portable equipment (SD) of a request to detect a U-turn of the user, iii. If a U-turn signal is received (step E4a), stopping the scanning (step E6) and determining the position (step E7) of the user (U) using the internal module (H) and the external module (Exl), iv. If presence is detected inside the vehicle (V), then the scanning is stopped and an alert is sent (step E5b) to the user, c. Otherwise at the end of the predetermined duration (tmax), if there is no reception of a U-turn signal and if there is no detection of presence inside the vehicle, then determination of the position (step E7) of the user using the internal module (II) and the external module (Exl).

2. Scanning method according to claim 1, characterized in that if it there is detection of presence inside the vehicle (V), then transmission to the portable equipment (SD) of a U-turn detection stop signal.

3. A method of scanning according to any one of the preceding claims, characterized in that the method further comprises: a. simultaneously with the scanning, a step of determining (step E3c) a distance between the user (U) and the vehicle carried out by the external module (Exl), b. If a U-turn signal is received, a verification step (step E5c) that values ​​of said distance are representative of a U-turn, c. the scanning being stopped (step E6) and the determination of the position (step E7) of the user being carried out using the internal module (II) and the external module (Exl) only if said verification is proven.

4. Scanning device (D) intended to be mounted on a motor vehicle (V) comprising at least one internal ultra-wideband transmission and reception module (II) capable of transmitting towards the interior of the vehicle (V) and at least one external ultra-wideband transmission and reception module (Exl) capable of transmitting towards the exterior of the vehicle (V), and capable of locating a portable “hands-free” access device (SD) carried by a user (U), the device (D) being characterized in that it is equipped with a clock and that it is capable of: a. Communicate with said equipment (SD) in Ultra High Frequency (BLE), b. Detect vehicle lock (V), c. Scanning for a presence inside the vehicle using the internal module (II) by emitting ultra-wideband waves, and comparing a profile of waves reflected and received by said module with at least one profile of predetermined waves, d. Simultaneously, transmitting to said equipment (SD) a request for detection of a user turn, e. Depending on a U-turn signal received from the portable equipment (SD) or a presence detection inside the vehicle: i. Stop scanning and ii. Determine the user's position using the internal module (II) and the external module (Ex 1), f. Issue an alert to the user (U) if a presence is detected inside the vehicle.

5. Scanning device (D), according to claim 4, characterized in that it is capable of transmitting a request to stop the measurements of the gyroscope (G) to the portable equipment (SD) as a function of the detection of presence inside the vehicle.

6. Scanning device (D) according to any one of claims 4 or 5, characterized in that it is capable: a. of determining a distance between the user and the vehicle via the external module (Exl, Ex2, Ex3, Ex4), b. Depending on the U-turn signal, of verifying that values ​​of said distance correspond to a U-turn, c. of stopping the scanning and determining the position of the user (U) using the internal (II) and external (Exl) module depending on the result of the verification,

7. A computer program product, comprising program code instructions for executing the steps of the scanning method according to any one of claims 1 to 3.

8. Motor vehicle (V), characterized in that it comprises a scanning device (D), according to any one of claims 4 to 6.

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