• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for detecting a fixed position, at a predetermined distance from a vehicle (10), an activation means (20) of a function of said vehicle (10). The method compares amplitude values according to at least one component of an electromagnetic field induced by an antenna (14) of the vehicle (10) and measured by the activation means (20) during a detection time interval. to determine whether said activation means (20) has remained in a fixed position for the duration of said detection time interval.
    公开号:FR3020027A1
    申请号:FR1453612
    申请日:2014-04-22
    公开日:2015-10-23
    发明作者:Alain Brillon
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates generally to the activation of a function of a vehicle, in particular a vehicle, and more particularly to the detection of a fixed position of an activation means at a predetermined distance from a vehicle. to enable activation of a function of said vehicle. The invention finds particular applications in the automotive sector and more particularly in the "hands free" systems for locking and / or unlocking the opening of a vehicle such as, for example, a door, a trunk, etc. An example of a system for detecting a fixed position of an activation means at a predetermined distance from a vehicle is illustrated in FIG. 1. Such a system comprises a vehicle V and an activation means appearing in a vehicle. this example in the form of a badge B "hands-free" access to the vehicle V. The vehicle comprises an activation module C (an electronic unit) and three omnidirectional antennas coupled to said activation module C: an antenna left side L and a right side antenna R, respectively arranged in each of the door handles left front and right front, and a rear antenna T disposed in the rear area at the rear bumper or the trunk lock, the V. Under the control of the activation module C, the antennas L, R and T emit electromagnetic waves inducing an electromagnetic field defining a zone of emission, respectively ZL, ZR and ZT. The badge B is associated with the vehicle V by means of an identifier and is configured, on the one hand, to detect the presence of at least one of the antennas L, R and T and to measure their amplitude. total of the electromagnetic field received, from at least one antenna and, secondly, to transmit the values thus measured to the activation module C. A known example of use of such a system relates to the automatic opening a vehicle trunk. To do this, the user is in the transmission space ZT of the rear antenna T located at the trunk of the vehicle V and then performs a predetermined sequence of movements characterizing its intention to open the trunk. Such a sequence may, for example, comprise a single stopping of the badge B in a fixed position for a predetermined minimum duration or a first stopping of the badge B in a fixed position at a first distance for a first predetermined minimum duration and then a second stopping the badge B in a fixed position at a second distance for a second predetermined minimum duration. To detect a fixed position of the badge B, the badge B periodically measures, during a predetermined detection time interval, the total amplitude of the electromagnetic field vector that it receives from the nearest antenna and sends these measurements. to the activation module C of the vehicle V via the rear antenna T. The activation module C then compares the values received between them in order to determine whether the total amplitude of the electromagnetic field is constant during the duration of the interval detection time, which allows to characterize a fixed position of the badge B with respect to the vehicle V. A problem arises when the user moves in an arc around the antenna T because in this case, the amplitude the electromagnetic field vector is constant while the badge B is not in a fixed position relative to the antenna T. In such a case, the opening of the trunk can occur while the opening sequence has pa s been carried out. An obvious solution would be to use two antennas mounted at the rear of the vehicle, in order to obtain the exact position of the badge B by a triangulation method, but such a solution would significantly increase the cost and complexity of the system. which has disadvantages. The object of the invention is to remedy at least part of these disadvantages by proposing a simple, effective and inexpensive solution making it possible to ensure that a position of an activation means is fixed relative to the vehicle V in order to identify an activation sequence of a function of a vehicle. The invention firstly relates to a method for detecting a fixed position, at a predetermined distance from a vehicle, of means for activating a function of said vehicle, the vehicle comprising an activation module and at least one antenna coupled to said activation module, said method comprising: a first step of emitting electromagnetic waves by said antenna inducing, in a transmission space, an electromagnetic field defined at a point of said space of emission by a first component according to a first spatial dimension, a second component according to a second spatial dimension and a third component according to a third spatial dimension, - a second step of measurement by the activation means during a predetermined detection time interval , values of the first component, values of the second component, values of the third component of the magnetic field received by the activation means; a third step of transmitting, by the activation means, the values of the first component, the values of the second component, the values of the third component of the received magnetic field, thus measured; step of receiving and storing by the activation module a number n of sets sent by the activation means, each comprising a value of the first component, a value of the second component and a value of the third component of the electromagnetic field, induced by the waves emitted by the antenna and, - a fifth step of comparison between them of n values received from at least one of the first component of the electromagnetic field, and / or the second component of the electromagnetic field and / or the third component of the electromagnetic field, - a sixth step of determining a fixed position of the activation means at a predetermined distance from the for the duration of the detection time interval when the n compared values are within a predetermined amplitude range. The method according to the invention advantageously makes it possible to ensure that the electromagnetic field measured in amplitude according to each of the three dimensions of the space at the level of the activation means remains constant according to at least one of said three spatial dimensions for the duration of the predetermined detection time interval and therefore the activation means remains fixed. Too low values of one or two components of the electromagnetic field (for example, attenuated by a source of frequency noise such as, for example, a mobile phone) may not be taken into account in deciding that the activation means is fixed relative to the vehicle. Thus, when the total amplitude of the electromagnetic field vector is constant but the activation means moves (for example in an arc around the antenna), the values measured according to at least one of the three spatial dimensions during the duration of the detection time interval, for example according to an axis perfectly oriented according to the electromagnetic field generated by the antenna, will not be included in the predetermined amplitude interval and it will be deduced that the means of activation is not fixed at a predetermined distance from the vehicle during the duration of the detection time interval.
    [0002] Preferably, during the fifth comparison step, the method comprises: a step of comparing the received n values of the first component of the electromagnetic field with each other; a step of comparing the n values of the second component of the field with each other; electromagnetic received, - a step of comparing between them n received values of the third component of the electromagnetic field, - a step of determining a fixed position of the activation means at a predetermined distance from the vehicle during the duration of the interval detection time when the n compared values of the first component of the electromagnetic field are within a first predetermined amplitude range, the n compared values of the second component of the electromagnetic field are within a second predetermined amplitude range and the n compared values of the third component of the field the electromagnetics are within a third predetermined amplitude range. The use of the values of the electromagnetic field measured according to its three components makes it possible to ensure that the electromagnetic field remains constant in each of said three spatial dimensions for the duration of the detection time interval, which makes the detection at the same time reliable and accurate. A movement of the arcuate activation means at a constant distance from the antenna is thus not detected as a fixed position thereof since the electromagnetic field will vary in this case according to at least two of the three spatial dimensions.
    [0003] The amplitude gap widths of the first component, the second component and the third component of the electromagnetic field are predetermined so as to allow a tolerance in the detection of a fixed position of the activation means for the cases where the The user would move the activation means a few millimeters or centimeters for the duration of the predetermined detection time interval or to ensure that the distance representing a fixed position is within a range of distance. Fixed position in the sense of the invention is thus understood to mean a substantially fixed position supporting a limited movement tolerance. According to one aspect of the invention, the step of emitting electromagnetic waves by the antenna is performed periodically. The comparison between them of the values of one and the same component of the electromagnetic field can be carried out by comparing the values two by two or by comparing the minimum value and the maximum value or else by producing a scalar product in pairs of vectors of the electromagnetic field (such a scalar product being less than 1 or a threshold close to 1 when the values are respectively different or significantly different from each other). According to one aspect of the invention, the determining step may comprise a distance conversion of the values of the electromagnetic field, the amplitude intervals of values of the components of the electromagnetic field corresponding then each to a predetermined distance interval. Advantageously, the detection of a fixed position of an activation means allows the opening of an access to the vehicle, for example a boot or a door. The invention also relates to a vehicle for detecting a fixed position, at a predetermined distance from said vehicle, of means for activating a function of the vehicle, the vehicle comprising an activation module and at least one coupled antenna. said activation module, configured to emit electromagnetic waves inducing, in a transmission space, an electromagnetic field defined at a point of said emission space by a first component according to a first spatial dimension, a second component according to a second spatial dimension and a third component according to a third spatial dimension, the activation module being configured to: - receive a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the electromagnetic field, induced by the waves emitted by the antenna, these values being measured by a mean n activation, preferably periodically, during a predetermined detection time interval, - compare between them n received values of at least one of the first component of the electromagnetic field, the second component of the electromagnetic field and / or the third component of the electromagnetic field; - determining a fixed position of the activating means at a predetermined distance from the vehicle during the duration of the detection time interval when the n compared values are within a range of amplitude predetermined. Preferably, the vehicle is configured to: - compare n received values of the first component of the electromagnetic field between them, - compare n received values of the second component of the electromagnetic field between them, - compare between them n values of the third component of the electromagnetic field. received electromagnetic field, - determining a fixed position of the activation means at a predetermined distance from the vehicle during the duration of the detection time interval when the n compared values of the first component of the electromagnetic field are within a first range of predetermined amplitude, the n compared values of the second component of the electromagnetic field are within a second predetermined amplitude range and the n compared values of the third component of the electromagnetic field are within a third predetermined amplitude range. The invention also relates to a system for detecting a fixed position, at a predetermined distance from a vehicle, means for activating a function of said vehicle, said system comprising a vehicle as presented above and at least means for activating a function of said vehicle, said activating means being configured to measure and send to the activation module via its antenna, preferably periodically, during a predetermined detection time interval, a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the amplitude of the electromagnetic field, induced by the waves emitted by the antenna.
    [0004] Preferably, the activation means is in the form of a badge. Other features and advantages of the invention will become apparent from the following description given with reference to the appended figures given by way of non-limiting examples and in which identical references are given to similar objects.
    [0005] Figure 1 (already commented) illustrates a motor vehicle comprising three antennas emitting an electromagnetic field, Figure 2 schematically illustrates the system according to the invention, Figure 3 schematically illustrates the method according to the invention. The system according to the invention allows activation of a function of a vehicle from an activation means. In the embodiment described below, the system allows the opening of the trunk of a vehicle. Of course, the activation of any other function of the vehicle could be envisaged such as for example, the starting of the vehicle, locking access etc. For this purpose, as shown diagrammatically in FIG. 2, the system 1 comprises a vehicle 10, for example an automobile, and an activation means 20 associated with said vehicle 10. The vehicle 10 comprises an activation module 12 of the vehicle 10. opening of the trunk of the vehicle 10 and an omnidirectional antenna 14 mounted in the rear part of the vehicle 10 coupled to said activation module 12 and configured, on the one hand, to emit, preferably periodically, electromagnetic waves inducing an electromagnetic field in a transmission space around the vehicle 10 and, secondly, to receive electromagnetic waves from the activation means 20. The electromagnetic waves emitted by the antenna 14 may comprise information grouped in a so-called "detection frame" Including a vehicle identification code 10 or information grouped in a so-called "measurement request" frame including a request e intended for an activation means 20 associated with the vehicle for measuring, by said activation means 20, the components of the magnetic field induced by the electromagnetic waves emitted by the antenna 14. The electromagnetic field induced by the waves emitted by the antenna 14 can be quantified at any point in the emission space and can be broken down into three components according to the three dimensions of the space: a first component according to a first spatial dimension X, a second component according to a second dimension Y and a third component according to a third spatial dimension Z. The activation module 12 is configured to receive via the antenna 14 a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the electromagnetic field measured by the activating means 20 during a detent time interval The activation module 12 is also configured to compare with each other the values of at least one of the first component of the electromagnetic field. the second component of the electromagnetic field and / or the third component of the electromagnetic field. Preferably, the activation module 12 is configured to, on the one hand, compare the values of the first component of the electromagnetic field between them, on the other hand, to compare the values of the second component of the field with one another. electromagnetic and, moreover, to compare between them the values of the third component of the electromagnetic field. The activation module 12 is further configured to determine that an activation means 20 is in a fixed position at a predetermined distance from the vehicle 10 for the duration of the detection time interval from the comparisons made between the values. of the first component of the electromagnetic field and / or between the values of the second component of the electromagnetic field and / or between the values of the third component of the electromagnetic field elsewhere. More specifically, the activation module 12 determines that an activating means 20 is in a fixed position at a predetermined distance from the vehicle 10 during the duration of the detection time interval when the n values measured by said means of activation. activation 20 are within a predetermined amplitude range. Preferably, the activation module 12 determines that an activation means 20 is in a fixed position at a predetermined distance from the vehicle 10 for the duration of the detection time interval when: the n values of the first component of the electromagnetic field, measured by said activation means 20, are included in a first predetermined amplitude range, - the n values of the second component of the electromagnetic field, measured by said activation means 20, are included in a second predetermined amplitude interval, and the n values of the third component of the electromagnetic field, measured by said activation means 20, are in a third predetermined amplitude range. In a preferred embodiment, the activation module 12 comprises or is connected to a computer (not shown) configured to perform comparisons and determination of a fixed position of an activation means 20 at a predetermined distance. of the vehicle 10. The activation means 20 is firstly configured to emit electromagnetic waves comprising information grouped together in a so-called "wake-up" frame intended for the antenna 14 and comprising in particular an identification code for the means activation 20. The activation means 20 is then configured to measure, during a predetermined detection time interval, a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component. an electromagnetic field induced by the electromagnetic waves emitted by the antenna 14.
    [0006] The activation means 20 is furthermore configured to emit, preferably periodically, electromagnetic waves comprising information grouped together in a so-called "measurement" frame intended for the antenna 14 and comprising a set of values of the three spatial components of the field. the activation means 20 is also configured to send, preferably periodically, these measurement frames to the activation module. 12. For this purpose, the activation means 20 comprises antenna-type transmission means (not shown).
    [0007] The activation means 20 is preferably in the form of a badge, without this being a limitation of the scope of the present invention. The method according to the invention, illustrated in Figure 3, implemented by the system 1 will now be described, still in its application to the opening of a trunk of a vehicle 10.
    [0008] The opening of a vehicle trunk 10 can be activated by the activation module 12 of the vehicle 10 when an activation sequence is performed by the activation means 20. Such an activation sequence can include the placement activation means 20 at one or more predetermined distances from the vehicle 10 in, respectively, one or more fixed positions. In order to detect a fixed position of an activation means 20, the activation module 12 of the vehicle 10 emits periodically, for example every 300 to 500 ms, in a step E1, electromagnetic waves comprising a so-called "detection" frame in a transmission space via its antenna 14. When an activation means 20 associated with the vehicle 10 enters said transmission space and receives at least one of the detection frames transmitted by the antenna 14, it determines, in a step E2, using the identification code of the vehicle 10, that it is in the emission space of an antenna 14 coupled to an activation module 12 with which he is associated. The activation means 20 then sends, in a step E3, electromagnetic waves comprising a so-called "wake-up" frame to the activation module 12 via the antenna 14. The activation module 12 then analyzes, in a step E4, the received wake-up frame and determines, from the identification code of the activation means 20 that it contains, that this frame has been sent by an activation means 20 associated therewith.
    [0009] This being done, the activation module 12 sends, again via the antenna 14, electromagnetic waves comprising a measurement request frame to the activation means 20 in a step E5. Upon receiving the measurement request frame, the activation means 20 will then periodically perform, during a predetermined detection time interval, in a step E6a, a measurement of the values of the three spatial components of the amplitude of the electromagnetic field emitted by the antenna 14 of the activation module 12. After each measurement carried out, the activation means 12 sends to the activation module 12 (Step E6b) which receives them via the antenna 14, in a step E7, the values of the three spatial components of the electromagnetic field measured. The predetermined detection time interval preferably comprises a plurality of measurement periods by the activating means 20, for example five two-by-two spaced measurements of 300 ms, representing a detection interval duration of 1.5. second. Each set of three component values of the amplitude of the electromagnetic field is received and stored by the activation module 12, for example in a memory zone (not shown), in a step E8. At the end of the detection time interval, the activation module 12 compares: the values of the first component on the one hand in a step E9a, the values of the second component on the other hand in a step E9b and the value of the third component elsewhere in a step E9c. When the values of the first component are close to each other, that is to say included in a first amplitude range, when the values of the second component are close to each other, that is to say ie, included in a second amplitude interval, and when the values of the third component are close to each other, that is to say included in a third amplitude range, the activation module 12 determines in a step E10 that the activating means 20 has remained in a substantially fixed position for the duration of the detection time interval. By the terms "close to each other" is meant that the difference between the values of the same component is small. For example, the values can be compared two by two and we deduce that they are close when their differences are all below a threshold. For example again, the minimum value and the maximum value of the values of the same component can be compared and it is deduced that all the values of the series are close when the difference between the minimum value and the maximum value is less than a threshold. . Alternatively, for at least two measurements made during the same period, the electromagnetic field vector is determined and then the scalar product of these two by two vectors is made. It is deduced that the values are close when this scalar product is equal to 1 or greater than a predetermined threshold close to 1. Moreover, it can also be expected that, when the values of one or two components are too low, by example when the activation means 20 is not oriented in the direction of these components with respect to the direction of the electromagnetic field emitted by the antenna of the vehicle, they can be ignored in the determination of the substantially fixed position, during the duration of the detection time interval, the activation means 20. In this case, the amplitude values of the electromagnetic field according to one or two of its components can be used to determine that the activation means 20 moves while the (total) amplitude of the electromagnetic field vector is constant. In one embodiment, the values of the components of the magnetic field are converted to a distance, which makes it possible to precisely determine the position of the activation means 20 with respect to the vehicle V. Once the activation sequence has been correctly performed by the activation means 20, the activation module 12 then activates the associated function of the vehicle 10, that is to say the opening of the trunk of the vehicle 10 in the present example. The detection method according to the invention therefore comprises the following steps: a first electromagnetic wave emitting step E5 inducing, in a transmission space, an electromagnetic field defined at a point of said emission space by a first component according to a first spatial dimension, a second component according to a second spatial dimension and a third component according to a third spatial dimension, 30 - a second measurement step E6a by the activation means 20 during a predetermined detection time interval, values of the first component, values of the second component, values of the third component of the magnetic field received by the activation means 20, - a third emission step E6b by the activation means 20 of the values measured, - a fourth step E7 of reception and storage E8 by the activation module 12 of a number n of sets comprising ch acun a value of the first component, a value of the second component and a value of the third component of the electromagnetic field, induced by the waves emitted by the antenna 14, - a fifth step E9a, E9b, E9c of comparison between them. n values received from at least one of the first component of the electromagnetic field, and / or the second component of the electromagnetic field and / or the third component of the electromagnetic field, - a sixth step E10 of determining a position set of activation means 20 at a predetermined distance from the vehicle 10 during the duration of the detection time interval when the n compared values are within a predetermined amplitude range.
    [0010] It should be noted, moreover, that the present invention is not limited to the examples described above and is capable of numerous variants accessible to those skilled in the art. In particular, the position of the antenna 14 in the vehicle 10, the type of function activated from the detection of a fixed position of an activation means 20, the period of measurement of the values, the duration of the interval of detection time, the widths of the amplitude intervals of the values of the components of the electromagnetic field ..., can not be interpreted as limiting.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. A method of detecting a fixed position, at a predetermined distance from a vehicle (10), of an activation means (20) of a function of said vehicle (10), the vehicle (10) comprising a module of activation (12) and at least one antenna (14) coupled to said activation module (12), said method being characterized in that it comprises: - a first step (E5) for emitting electromagnetic waves inducing in a transmission space, an electromagnetic field defined at a point of said emission space by a first component according to a first spatial dimension, a second component according to a second spatial dimension and a third component according to a third spatial dimension; a second measuring step (E6a) by the activating means (20) during a predetermined detection time interval, values of the first component, values of the second component, values of the third component of the magnetic field received by the activating means (20), - a third transmitting step (E6b) by the activating means (20) of the measured values, - a fourth receiving and storing step (E7) (E8 ) by the activation module (12) of a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the electromagnetic field, induced by the waves emitted by the antenna (14), - a fifth step (E9a, E9b, E9c) for comparing n received values of at least one of the first component of the electromagnetic field, and / or the second component. of the electromagnetic field and / or the third component of the electromagnetic field; - a sixth step (E10) of determining a fixed position of the activating means (20) at a predetermined distance from the vehicle (10) during the period of time; the detection time interval when the n Compared values are within a predetermined amplitude range.
    [0002]
    2. Method according to claim 1, characterized in that it comprises: - a step (E9a) of comparison between n values of the first component of the electromagnetic field received, - a step (E9b) of comparison between them n values of the second component of the electromagnetic field received, - a step (E9c) of comparison between n received values of the third component of the electromagnetic field, - a step (E10) for determining a fixed position of the activation means (20) at a predetermined distance from the vehicle (10) during the duration of the detection time interval when the n values of the first component of the electromagnetic field are within a first predetermined interval, the n values of the second component of the electromagnetic field are included in a second predetermined interval and the n values of the third component of the electromagnetic field are comprised of in a third predetermined interval.
    [0003]
    3. Method according to any one of the preceding claims, characterized in that the step (E5) of emitting electromagnetic waves by the antenna (14) is performed periodically.
    [0004]
    4. Method according to any one of the preceding claims, characterized in that the comparison between them of the values of the same component of the electromagnetic field is performed by comparing the values two by two or by comparing the minimum value and the maximum value. or else by producing a scalar product two by two vectors of the electromagnetic field.
    [0005]
    5. Method according to any one of the preceding claims, characterized in that the determining step (E10) comprises a distance conversion of the values of the electromagnetic field, the value intervals of the components of the electromagnetic field corresponding to each then an interval. predetermined distance.
    [0006]
    6. Method according to any one of the preceding claims, characterized in that the detection of a fixed position of an activation means (20) allows the opening of an access to the vehicle (10), for example a chest or a door.
    [0007]
    7. Vehicle (10) for detecting a fixed position, at a predetermined distance from said vehicle (10), of an activation means (20) of a function of the vehicle (10), the vehicle (10) characterized in that it comprises an activation module (12) and at least one antenna (14), coupled to said activation module (12), configured to emit electromagnetic waves inducing, in a transmission space an electromagnetic field defined at a point of said emission space by a first component according to a first spatial dimension (X), a second component according to a second spatial dimension (Y) and a third component according to a third spatial dimension (Z), the activation module (12) being configured to: - receive a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the electromagnetic field, induced by the waves ed set by the antenna (14), these values being measured by an activating means (20), preferably periodically, during a predetermined detection time interval, - comparing between them n received values of at least one of the first component of the electromagnetic field, the second component of the electromagnetic field and / or the third component of the electromagnetic field, - determining a fixed position of the activation means (20) at a predetermined distance from the vehicle (10) during the duration of the detection time interval when the n compared values are within a predetermined amplitude range.
    [0008]
    8. A system for detecting a fixed position, at a predetermined distance from a vehicle (10), means for activating (20) a function of said vehicle (10), said system (1) being characterized in that it comprises a vehicle (10) according to the preceding claim and at least one activation means (20) of a function of said vehicle (10), said activation means (20) being configured to measure and send to the activation module (12) via its antenna (14), preferably periodically, during a predetermined detection time interval, a number n of sets each comprising a value of the first component, a value of the second component and a value of the third component of the amplitude of the electromagnetic field, induced by the waves emitted by the antenna (14).
    [0009]
    9. System according to the preceding claim, characterized in that the activation means (20) is in the form of a badge.
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1453612A|FR3020027B1|2014-04-22|2014-04-22|METHOD FOR DETECTING A FIXED POSITION OF A VEHICLE PREDETERMINED REMOTE MEDIATING MEANS|FR1453612A| FR3020027B1|2014-04-22|2014-04-22|METHOD FOR DETECTING A FIXED POSITION OF A VEHICLE PREDETERMINED REMOTE MEDIATING MEANS|
    JP2015086629A| JP6714326B2|2014-04-22|2015-04-21|Method, vehicle and system for detecting stationary position of starting means at a predetermined distance from the vehicle|
    CN201510311934.1A| CN105022023B|2014-04-22|2015-04-21|The method for detecting the fixation position away from the activation device at vehicle preset distance|
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