• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present invention relates to a method for transmitting a radio signal between a mobile electronic wheel unit (5) of a vehicle and a fixed centralized electronic control unit of said vehicle, characterized in that it comprises the following steps: • picking up from the electronic wheel unit (5), during a rotation thereof, information defining a given angular position of said wheel at a given instant, and defining a reference angular reference (Rref) of the wheel, derived from said information, fixed with respect to the wheel and corresponding to said given angular position, then establishing a transmission of said radio signal between the electronic unit (5) of the wheel and the centralized electronic control unit, such that said signal is transmitted at a predetermined angular position of the wheel, calculated from said reference angular reference mark (Rref) e.
    公开号:FR3018649A1
    申请号:FR1452115
    申请日:2014-03-14
    公开日:2015-09-18
    发明作者:Sebastien Kessler；Nicolas Guinart；Mohamed Cheikh
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method of transmitting a radio signal between a mobile wheel electronic unit of a vehicle and a fixed centralized electronic control unit of said vehicle, or ECU abbreviated to "Electronic Control Unit" in English ( electronic control unit).
    [0002] The electronic wheel units currently have the function of informing the centralized electronic control unit about various parameters relating to the wheel, such as the tire pressure, the temperature of the gas inside the tire or the wheel temperature, the impression on the ground of the tire for example the length of this impression along the plane of the wheel. These electronic wheel units are generally fitted to each wheel of the vehicle and are generally fixed inside the tire against its tread, and are provided with means for detecting when the tread contacts the ground and the tread. when it leaves the ground, by the induced radial displacement of the tread. These means are for example an accelerometer or a shock sensor or the like associated with the electronic wheel unit, which measures, in the case of the accelerometer for example, the difference in radial acceleration when the tread comes into contact. with the ground and leave this contact. Each electronic wheel unit transmits radio signals (generally high frequency) to the central electronic control unit so that the latter informs the driver of abnormal measured parameters, and also so that this centralized electronic control unit can locate the position. of each wheel unit on the vehicle during the lifetime of the tire associated with the wheel, this even in case of change of position of the wheel on the vehicle.
    [0003] During the rotation of a wheel, and on a turn of the wheel, there are generally parts of the electronic wheel unit trajectories in which the transmission is not made, called non-signal transmission zones or zones of the wheel. shadow, which correspond to a zone of rupture of transmission of the signal. This may be true for each wheel of the same vehicle in a different and unpredictable way. There is, however, by convention a limited acceptance of the number and duration of shadows for one revolution. For example, it is generally accepted a shadow zone of about 10 ° maximum per wheel revolution. In certain particular cases, this number may be increased to two shadows each of the order of 10 ° maximum per revolution of the wheel.
    [0004] A TPMS (Tire Pressure Monitoring System) protocol is the transmission of radio signals between the electronic wheel units and the centralized electronic control unit. Electronic wheel units, for example, have information messages to be transmitted to the centralized electronic control unit. The transmission of an information message must be provided within a specified period. A complete message is transmitted in a radio signal transmitted at one time; this signal is still called "frame". According to a known example of TPMS protocol, in order to ensure the good reception of an information message by the centralized electronic control unit, the transmission of a train of three identical successive signals in each of which is the message of information to be transmitted. A train of identical signals is also called a "burst". Each frame of the "burst" therefore contains a complete message of information to be transmitted. According to the exemplary TPMS protocol described, a plurality of trains or "burst" are generally identical in their content but may comprise different data resulting in particular from the updating of certain parameters such as the pressure of the tires. Each successive "burst" burst of the plurality of "burst" is emitted with a periodicity of the order of about one minute in running mode established. Still according to the exemplary TPMS protocol described, the period between the frames of the same "burst" is generally fixed. The period between the frames of the same "burst" is still called inter frame. In the direction of transmission from an electronic wheel unit to the centralized electronic control unit, the message transmitted by the wheel electronic unit is validated (ie received by the centralized electronic control unit). ) if at least one of the three signals or frames of the train is fully received, that is to say without encroaching on a shadow zone. In other words, a signal or frame is lost if part of it straddles a shadow area. The message is lost if the three signals or frames of the "burst" are lost. When the radiofrequency transmission performance on the vehicle is optimal for signal transmissions between the wheel unit and the centralized electronic control unit, that is to say when there is no signal zone one hundredth of the signals are received by the centralized electronic control unit, the standard protocol as described above thus has an energy efficiency of only 33% per signal train, because in any case, only one of the three received signals is useful. A vehicle without a shadow zone and where the reception rate reaches 100% is in fact not representative of reality. This explains the protocol redundancy, for example, of three successive signals per transmitted signal stream, to ensure a statistical transmission of an information message between an electronic wheel unit and the centralized electronic control unit, thus inducing an energy efficiency even further. less.
    [0005] The present invention proposes a method of transmission applicable to one or more radio signals between a mobile wheel electronic unit of a vehicle and a fixed centralized electronic control unit of said vehicle, or TPMS protocol, allowing at least to optimize energy consumption. with equal performance, and advantageously to improve the transmission performance. Improving the transmission performance means ensuring that the transmitted radio frequency signals can be statistically received by the receiving electronic unit within a defined minimum period of time, even in the presence of at least one shadow zone and whatever the speed of the vehicle to a predefined maximum speed, for example 250 km / h.
    [0006] Indeed, in the case of a transmission of the electronic wheel unit to the centralized electronic control unit, the signal transmission energy is supplied by the electronic wheel unit, that is to say by an autonomous power source included in the wheel electronic unit, lithium battery type, energy harvesting mechanism, or the like. In the case of a battery, it is to change when all its available energy has been used. In order to prolong the life of this battery, it is advisable to reduce the energy consumed during signal transmissions to the centralized electronic control unit. In the case of a mechanism for collecting energy, this collected energy is necessarily limited, an energy constraint therefore exists and it is appropriate to reduce the energy consumption of the wheel unit.
    [0007] More specifically, the invention consists of a method for transmitting a radio signal between an electronic unit of a vehicle's mobile wheel and a fixed centralized electronic control unit of said vehicle, characterized in that it comprises the following steps: picking up from the electronic wheel unit, during a rotation thereof, information defining a given angular position of said wheel at a given instant, and defining a reference angular reference wheel, derived from said information, fixed with respect to the wheel and corresponding to said given angular position, - subsequently establishing a transmission of said radio signal between the electronic wheel unit and the centralized electronic control unit, so that said signal is transmitted to a predetermined angular position of the wheel calculated from said reference angular reference.
    [0008] The information coming from the electronic wheel unit, defining a given angular position of the wheel at a given instant, is provided in known manner by a wheel unit equipped for example with an accelerometer or a shock sensor. , or a bending sensor or more generally a sensor from a piezoelectric technology, to know the mounting position of the wheel unit in the wheel on the vehicle or the footprint of the tire. In the present invention, this information is diverted from its original function, to be correlated with the functionality of the transmission of a message between the electronic wheel unit and the centralized electronic control unit, in order to establish a reference radial angular reference mark of the wheel, which does not rotate with the electronic wheel unit, from which it will be possible to control the position angle at a given moment of the electronic wheel unit to which the transmission of a signal will be made. Thus, the transmission of signals between an electronic wheel unit and the centralized electronic control unit can be done in a more targeted manner on a wheel revolution, and will distribute, for example, in an equiprobable way the signal transmissions on a single circuit. wheel, thereby ensuring that the receiver receives the information within a predetermined predetermined period of time. A given angular position of the wheel returns to a given angular position of the wheel electronic unit which is fixed on the wheel. The reference angular reference is thus intimately related to the precise angular position at which the electronic wheel unit is located when it is defined, since it comes from the electronic wheel unit itself. Such a reference angular reference can be defined at each wheel revolution by the event undergone by the electronic wheel unit which is at the origin. For example, if the information comes from the footprint of the tire, it may include the angle corresponding to the moment when the electronic wheel unit contacts (via the tread) with the ground or the moment it leaves it. In the case of an accelerometer mounted in the electronic unit fixed to the wheel and thus rotating with it, it may be locatable moments where the electronic wheel unit is for example at the high or low points of rotation. According to an advantageous characteristic, said electronic wheel unit comprises means for detecting the moment when the tread of the tire of the wheel is in contact with the ground or footprint of the tire of the wheel, said information defining a given angular position of said wheel at a given instant then being relative to the footprint of the tire of the wheel. The information from the ground tire footprint is produced in a known manner to handle functions or data relating to the load applied to said tire or tire wear. This is the preferred example of the information providing means which defines a given angular position of the wheel at a given moment. According to an advantageous characteristic, the method according to the invention consists in transmitting a plurality of successive radioelectric signals between the electronic wheel unit of a vehicle and the fixed centralized electronic control unit of said vehicle, each of said plurality of signals. successive signals being transmitted to a predetermined angular position different from the wheel, calculated from a reference angular reference, fixed relative to the wheel. For example, to use the terminology of the TPMS protocols described above, the plurality of successive signals here advantageously corresponds to a plurality of trains or "burst" each comprising a single signal or frame. According to an advantageous characteristic of the preceding one, said reference angular reference mark is updated before the transmission of each of the plurality of successive radioelectric signals. This feature relates more particularly to information from the footprint of the tire. The marker can be advantageously updated before each transmission of a radio signal, based on the information received on the footprint at this time, which may include data specific to a specific dynamic situation of the vehicle. An update of the angular reference mark consists in updating the information defining the given angular position of the wheel at the moment immediately preceding the transmission of a signal. For example, if we choose the instant when the electronic unit comes into contact with the ground (via the tread of the tire), the radial angular reference of the corresponding wheel is a function of the size of the tire cavity. soil, variable according to the load of the wheel. According to an advantageous characteristic, a division of one turn of the wheel into successive basic sectors from a reference angular reference mark is defined, and the step of establishing a transmission of a plurality of successive radioelectric signals. between the mobile wheel electronic unit and the centralized electronic control unit 30 is carried out such that each of said signals of said plurality of signals is transmitted at a predetermined angular position of the wheel, calculated from a angular reference mark and said sectoral division of the wheel. The sectoral division taking reference to the reference radial angular reference mark makes it possible to transmit the signals respectively at positions based on the sectors, ie known positions distributed over a wheel circumference. Thus, it is certain that the signal transmission is controlled on the wheel revolution and not completely random. It follows a transmission guarantee despite the possible presence of shadow area whose location is unknown, within a specified time, because the complete wheel revolution is certainly reached or covered by transmissions. In most cases, as will be developed further with the aid of examples of embodiments of the method according to the invention, it is certain that a base sector at least on a wheel turn will be out of range. Shade and guarantee the transmission of the signal, provided that the angular duration of the transmission of the frame is correctly defined to be well below one wheel revolution at the maximum speed of the vehicle. According to another advantageous characteristic of the preceding one: the time elapsed between the position of the electronic wheel unit is measured at an angular reference mark of the wheel on the one hand and an identical position of the electronic wheel unit on the other hand. next turn of the wheel on the other hand, making it possible to calculate an angular speed of rotation of the wheel, - a minimum sector of wheel rotation is determined necessary for the transmission time of a signal between the electronic wheel unit and the wheel. centralized electronic control unit, at the calculated rotational angular velocity of the wheel, an angular transmission offset is determined between a first signal and a second signal which is successive to the first signal, relative to the reference angular reference, as being equal to the smallest multiple of the basic divisional sector which covers the time necessary for the transmission of said first radio signal at the angular velocity calculated rotation. This characteristic makes it possible to define a sectoral distribution of the successive signal transmissions which is adapted to the speed of the vehicle, ie to the speed of rotation of the wheel. Indeed, depending on the speed of rotation of the wheel, the transmission of a signal covers a more or less open wheel sector, which can extend over several divisional basic sectors. This characteristic makes it possible to define a sequence of successive signal transmission which targets, for example, the transmission of a signal on one or more sectors not reached by the transmission of the previous signal. According to another advantageous characteristic, said information defining a given angular position of said wheel at a given moment, relative to the footprint of the tire of the wheel, is one of the moments chosen between the instant when the electronic unit of wheel makes contact with the ground (via the tread of the tire) and the moment when said electronic wheel unit leaves the ground (via the tread of the tire), defining a radial reference reference mark of the wheel . This choice of information is preferred because it is one of the most energy efficient.
    [0009] According to another advantageous characteristic, said transmission of the signals of the plurality of successive radioelectric signals is carried out according to a defined sequence so that each of the basic sectors of the wheel is reached by the transmission of at least one of said plurality of signals. signals.
    [0010] This characteristic allows a distribution of the transmitted signals, which is equiprobable on a wheel revolution, knowing that the signal transmission is spread over time over several turns of the wheel, but that each time a signal is transmitted, it is transmitted in the relevant wheel revolution by reaching a given basic sector, in order to have the assurance that n sectors are reached with n signals.
    [0011] According to an advantageous characteristic of the preceding one, said transmission of the signals of the plurality of successive radioelectric signals is carried out according to a defined sequence so that said basic sectors of a turn of the wheel are reached according to a predetermined sectoral distribution. According to another advantageous characteristic of the preceding one, said transmission of the signals of the plurality of successive radioelectric signals is carried out according to a defined sequence so that said basic sectors of a turn of the wheel are reached according to a random sectoral distribution. Other features and advantages will appear on reading the following examples of embodiments of a method according to the invention, accompanied by the accompanying drawings, examples given by way of non-limiting illustration. - Figure 1 schematically shows a vehicle wheel in side view, on which have been shown examples of reference and sectorial division according to the invention; FIG. 2 schematically shows, on the basis of the example of FIG. 1, an example of signal transmission according to an embodiment of a method according to the invention. FIG. 1 shows a wheel 1 among the wheels supporting a vehicle (not shown) equipped with a tire pressure monitoring system (TPMS) (not shown), further comprising a known means (not shown) for determining from the footprint 2 of the tire 3 to the ground 4. The TPMS system described is of generally known type with the exception of the method of transmitting a radio signal between an electronic wheel unit of the vehicle and an electronic control unit or Fixed centralized ECU (not shown) of the vehicle, which is in accordance with the present invention. Each wheel of the vehicle is provided with a clean wheel electronic unit, in order to allow at least the monitoring of the pressure, the temperature of the tire of the wheel, and advantageously of its footprint on the ground. The electronic wheel unit 5 therefore comprises, in a known manner, a means (not shown), for example an accelerometer or preferably a shock sensor, in order to allow detection of the part of the tire running band 6 of the wheel. 1 which is in contact with the ground 4, or impression 2 on the ground of the tire 3 of the wheel 1. The shock sensor is preferred because it requires the least energy for the reading of an information defining a given angular position of the wheel 1 at a given moment. In FIG. 1, the part of the rolling band 6 of the tire 3 which is in contact with the ground 4 is included, in a revolution of the wheel, between the instant t1 at which the tread comes into contact with the tire. ground, and the moment t2 at which the tread leaves the ground 4. The accelerometer or the shock sensor which is fixed on the inner surface of the tread wheel, via the electronic wheel unit, detects these two instants t1 and t2 by the variation of acceleration or the induced shock. The procedure for determining the footprint 2 of the tire 3 on the ground 4 is in a known manner and will therefore not be more detailed here. This procedure consumes very little energy and its use will advantageously be diverted within the framework of the transmission method according to the invention. In the context of the present invention, by way of example, the time t1 or t2, for example t1, is thus chosen as the instant given in order to record the information defining a given angular position of the wheel 1 at this instant. given, from the electronic wheel unit 5, to define a reference reference radial reference Rref of the wheel, derived from this information, fixed with respect to the wheel and corresponding to this given angular position, that is to say say passing through the point corresponding to instant tl. The transmission method thus comprises the following steps: - reading information from the electronic wheel unit 5 relative to the footprint 2 on the ground 4 of the tire 3 of the wheel 1, and defining a radial angular reference mark Rref reference of the rotating wheel, derived from the information relating to the imprint 2, - establishing a transmission of a radio signal between the electronic unit 5 of the rotating wheel 1 and the centralized electronic control unit, such that the signal is transmitted at a predetermined angular position of the wheel, calculated from the reference angular reference Rref. The reference angular reference mark Rref is preferably a radial mark and can be considered to be fixed or substantially fixed with respect to the spinning wheel, since it comes from the footprint itself fixed or substantially by compared to the spinning wheel. As indicated above, the information coming from the electronic wheel unit 5 relating to the footprint 2 of the tire 3 on the ground 4 may, for example, be the instant t1 where the electronic wheel unit 5 comes into operation. contact with the ground (via the tread of the tire), as represented in FIG. 1, defining a reference angular reference mark Rref at the front end of the imprint, or alternatively the instant t2 where the unit wheel electronics 5 leaves the ground (via the tread of the tire) defining a reference reference angular reference reference of the wheel at the rear end of the footprint 2. Establishing the transmission of a first radio signal containing a given message information, between the electronic unit 5 of the wheel 1 which rotates and the centralized electronic control unit, for example in the direction of the electronic unit 5 of the wheel 1 to the centralized electronic control unit, may consist of r to emit this first signal at the position of the reference angular reference reference, immediately after the fixing of the latter. In order to ensure good reception of the signal by the receiver unit, the transmission method advantageously consists in transmitting a plurality or train of successive radio signals between the vehicle's electronic wheel unit 5 and the fixed centralized electronic control unit. of this vehicle. By way of example, a signal may be identified to a frame and the plurality of signals may be identified to a plurality of trains or "burst" of a single signal each. With reference to the terminology defined above, each signal of the plurality of signals as defined herein, therefore corresponds to a "burst" containing a frame, that is to say a single signal. Each of the signals of the plurality or sequence of successive signals is transmitted according to the invention to a predetermined angular position of the wheel 1, calculated from a reference reference Rref reference, fixed relative to the wheel. For the transmission of successive signals, based on a reference angular reference reference Rref located at the front end of the cavity for example, as shown in Figure 1, the electronic unit 5 of the wheel 1 notes two times t1 successive as defined above defining a complete revolution of the wheel 1, and calculates the time separating these two instants. Which gives the radial velocity of the wheel. In order to proceed to the sectoral division as described in more detail below, the time separating two successive instants t1 can be divided into a predetermined given number of equal periods, which defines and corresponds to the number of basic divisional sectors for a lap of the wheel 1. The reference angular reference Rref is preferably updated before the transmission of each signal of the plurality or sequence of successive radio signals, as explained above. Preferably, when a second signal is transmitted successively to the first, in the example of the second "burst", the instant t1 is updated before the transmission of the second signal, and the same sectoral division is applied as for the first one. signal, that is to say the same number of divisional sectors of a wheel spin. It is understood that the reference angular reference Rref is preferably the same in theory for the transmission of all the signals of a plurality of signals. This is so that the calculation of the angular offsets of the signals of the same plurality of signals has the same origin. In practice, in the example, an information relating to the footprint of the tire being selected to define the reference reference angular reference, this angular reference can move slightly from one transmission to another without however deflecting from sensitively the sectoral division chosen for all the signal transmissions of the same plurality of signals.
    [0012] Preferably, therefore, as indicated above, the method described here comprises a step in which a division of a revolution of the wheel 1 into successive basic sectors is also defined from the reference angle reference Rref. This division once determined, thus preferably applies to each reference reference angular reference Rref updated before each transmission of a signal of the signal stream. It should be noted that the electronic wheel unit travels a given sector in a time which is a function of the angular speed of the wheel. The step of establishing a transmission of a plurality of successive radio signals between the electronic unit of the wheel 1 and the centralized electronic control unit is preferably carried out in such a way that each of the signals of the plurality of signals is transmitted to a predetermined angular position of the wheel 1, calculated from the reference reference angular reference Rref in force at the time of transmission, and further preferably from the sectoral division of the wheel 1 as indicated above . The division of the wheel 1 into basic sectors consists, for example, in measuring the travel time of the electronic wheel unit between two instants originating from the information relating to the imprint, for example two successive instants t1, or between two successive moments t2 if this instant t2 is chosen to define the reference angular reference. In both cases, this travel time of a wheel revolution is then divided into a plurality of equal time divisions each corresponding to the travel time of a basic division sector. The first issue of a signal is made immediately after obtaining this sectoral division. The sectoral division of the wheel 1 is advantageously chosen (number of sectors) so that the successive signal transmissions definitely extend over one wheel revolution, within the given transmission time of information according to the protocol or the considered rules that depend on the type of information transmitted, while taking into account the time separating two successive signals. This division may consist, for example, of eight identical basic sectors, referenced S1 to S8 as shown in FIG. 1, with a respective opening angle equal to 45 °. In FIG. 2, eight circular arcs represent the transmission of eight successive signals Si. The angular duration of transmission of one of the signals Si corresponds to the represented arc length of the signal considered. In FIG. 2, the simplicity of the representation assumes the identical wheel speed during the transmission of each of the eight successive signals Si. Upon transmission of each of the eight signals Si, the electronic wheel unit is located at the transmission start point of the signal Si considered. FIG. 2 also shows an example of an effective shadow zone Zo in which no transmission passes. If, for example, a signal Si is transmitted at the beginning of each sector, as represented for example in FIG. 2, with a periodicity between two successive one-minute signals Si, eight minutes will be required to cover the eight sectors. Some protocols require the guarantee of transmission of a message in ten minutes maximum; a division into eight sectors ensures the transmission in a shorter time therefore compatible with such a protocol. In the example of FIG. 2, the signals transmitted in sectors S2 and S3 are in transmission failure and therefore not received by the receiver of the centralized electronic control unit. The time taken by the electronic unit of the wheel 1 to take one turn is therefore divided in the example into eight equal intervals, each corresponding to the time taken by the electronic wheel unit to travel through a basic sector. The emission of a signal on a given sector is for example at the beginning of the sector. The first sector S1 starts from the reference reference Rref reference. Some examples of implementation of the method as described above will now be described, based on the transmission by the electronic wheel unit 25 of a plurality of signals corresponding to a plurality of "burst" d one frame (signal) each, every thirty seconds. This means, for example, the transmission of eight signals (eight "burst") in the eight sectors of the wheel 1, respectively, with a time interval of 30 seconds between two successive signals. The transmission angle of a signal may extend over a plurality of sectors depending on the speed of the vehicle, the transmission of each of the plurality of signals starting from a different sector. The emissions of the eight signals are thus equiprobably distributed over the wheel revolution, as for example represented in FIG. 2. The transmission of the signals of the plurality of successive radioelectric signals may be carried out for example according to a sequence defined in such a way. that the basic sectors of the wheel are reached according to a predetermined sectoral distribution. This predetermined sectoral distribution may for example be defined so that the signal transmissions are distributed according to a chronological cycle in ascending order of the sectors taken one after the other, or in a predetermined random or sequential order, as will be detailed further. In a first example of application of the method described above, the following steps are carried out: a reference reference mark Rref, set at a time t1 and then at the next wheel turn, is established at the instant corresponding T1, the sectoral division S1-S8 is established, for example as indicated above, - a first radio signal is emitted at the reference position Rref, ie at the beginning of the first sector S1, - the next transmission period is awaited for the emission of the second signal, in the example 30 seconds, the reference angular reference frame Rref is detected again, for example as indicated above with the updating of the reference mark Rref, then at the next wheel turn, 15 to At the corresponding instant t1, sector division S1-S8 is established, for example as indicated above, corresponding to the angular velocity of the wheel at this moment, the second radio signal is emitted at the computed position corr corresponding to the reference position Refrefined plus 45 °, ie at the beginning of the second sector S2, the following is thus carried out for the emission of a third, fourth, fifth, sixth, seventh, and eighth radio signal, respectively at the beginning of the third S3, fourth S4, fifth S5, sixth S6, seventh S7, and eighth S8 sectors, 25 - Once the eighth signal transmitted to the last sector S8, the transmission is restarted from the sector S1, because it is It is necessary to monitor the pressure continuously and to inform the centralized electronic control unit in less than ten minutes again, according to a sliding time window. This method can be generalized to other sectoral division values, which values may for example be related to the speed of the vehicle or the TPMS protocol retained. In this first example of application, the method described thus makes it possible to equally distribute radio signal transmissions over the eight defined sectors, ie over an entire theoretical or geometrical wheel revolution. Indeed, the transmissions did not of course take place in the same wheel revolution. It is thus possible to transmit on the various basic sectors in a cyclic manner in ascending order of basic sectors, for example successively on sectors S1, S2, S3, S4, S5, S6, S7, and S8 as described above. , or transmit according to a second example of application, alternately in a predetermined cyclic manner according to a given sectoral distribution, for example successively on sectors S2, S5, S8, S3, S6, S1, S4, and S7, that is to say say by emitting once all three sectors, or alternately transmit according to a third example of application in a random manner, for example successively on sectors S1, S4, S2, S6, S7, S3, S5, and S8. Thanks to such an angular registration, it is possible to control the distribution of the signal transmissions between each electronic wheel unit and the centralized electronic control unit, in a sectoral manner on a geometrical turn for each wheel, and thus to ensure that the case of a transmission of the electronic units of the wheels to the centralized electronic control unit, the latter receives the transmitted information despite the presence of area (s) of shade (s). Preferably, the following additional steps can be added to the process described above: the time elapsed between the position of the electronic wheel unit 1 at a reference reference wheel reference point Rref on the one hand, in the example position corresponding to the time t1, and an identical position of the electronic wheel unit to the next turn of the wheel on the other hand, making it possible to calculate an angular speed of rotation of the wheel 1, - determining a minimum sector of wheel rotation necessary for the transmission time of a signal between the electronic wheel unit and the centralized electronic control unit, at the calculated rotational angular velocity of the wheel 1, an offset is determined angular transmission between a first signal and a second signal successive to the first signal, relative to the reference angular reference Rref, as being equal to the smallest multiple of the divisional sector of low e which covers the time required for the transmission of said first radio signal to the calculated rotational angular velocity of the wheel 1. As an illustration of the foregoing, for a vehicle moving (legally) at 250 km / h provided with a wheel whose tire is of dimensions 215/55 R16, with a radio signal to be transmitted with a duration of 10 ms, a rotation angle of the wheel corresponding to the complete transmission of the signal, or transmission sector, is obtained; equal to or substantially equal to 123 ° wheel circumference, that is to say substantially equal to 1/3 of a wheel revolution. Thus, in the case of a division of the wheel into eight sectors S1 to S8 as described above, and in the worst case, it is three of the eight sectors S1 to S8 which may be out of transmission in the presence of a non-reception area in the lathe, which ensures a signal reception rate of 62.5%. Indeed, if the transmission covering a rotation of the wheel of 123 ° encounters a non-reception zone of 10 ° opening for example, it covers substantially three basic sectors at most (45 ° each), so trob sectors have been inefficient because the complete signal is considered not received. On the basis of a theoretical periodicity of emission of the eight successive signals equal to 30 seconds, and of a successive cyclic order of transmission in increasing order of the references of sectors taken one after the other, corresponding therefore to the sectors 51, S2, S3, S4, S5, S6, S7, and S8, this is a maximum of 2 minutes without information on the side of the centralized electronic control unit over the entire speed range between 0 10 and 250 km / h . Indeed, in the worst case, with a shadow zone in the sector S4, we received 51, S2, S3 and S4 lost, S5 received, ie 4 x 30 s = 2 min. Comparing the above example to a conventional periodic emission system every minute, there are intermediate critical speeds (eg 66 km / h, 132 km / h, 198 km / h, ...) where the three successive signals of a train ("burst") signals are emitted on the same angular zone, knowing that the train ("burst") following signals, there is nothing to ensure that this phenomenon does not do not reproduce. In the end then, over a window of two or three minutes, the centralized electronic control unit may have received a single train of signals, but can not guarantee 100%.
    [0013] By using a predetermined cyclic successive emission protocol, for example on sectors S2, S5, S8, S3, S6, 51, S4, and S7, it is possible to improve the transmission method described above, according to a first optimization, making it less sensitive, at high speed, the shadows and the elongated angular duration of transmission of a signal.
    [0014] Indeed, on the basis of the example above, the gap or opening of three successive sectors corresponds to an angular offset of 135 °, which makes it possible to "jump" a shadow zone onto two successive transmissions and thus ensuring better availability of information on the side of the centralized electronic control unit. In the worst case, we would go from information every 2 minutes to information every minute. The energy balance with the protocol according to the first optimization, and the emission of a train of a signal every thirty seconds, allows a gain of 33% with guaranteed information from the receiving unit every minute in the presence a shadow zone per wheel revolution of the order of 10 ° maximum aperture.
    [0015] A second optimization is to increase the rolling periodic emission established at 45 seconds by keeping the protocol described above. Indeed, on the basis of the preceding example, the gap or angular opening of three successive sectors corresponds to an angular offset of 135 °, which allows to "jump" a shadow zone on two successive transmissions and thus ensure better availability of information on the side of the centralized electronic control unit. We would go in the worst case of information every 2 minutes to information every 1.5 minutes.
    [0016] 5 The energy balance with the protocol according to the second optimization, with the emission of a train or "burst" of a signal every 45 seconds, allows a gain of 55% with guaranteed information on the side of the receiving unit every minute and a half in the presence of a shadow zone per wheel revolution of the order of 10 ° maximum opening. A third optimization consists in adjusting the cyclic transmission protocol as a function of the speed of the vehicle, for example calculated on the basis of the detected footprint. It is thus possible to adjust the angular difference between two train transmissions for low vehicle speeds and also higher than 250 km / h, so that the system could offer the same performance as the angular duration of the signal of a train does not exceed 50% of a wheel revolution.
    [0017] A fourth optimization consists in adjusting the periodicity of the emission of a train of a single signal as a function of the vehicle phases, low speed, average or stabilized speed, high speed.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. A method of transmitting a radio signal between a mobile electronic wheel unit (5) of a vehicle and a fixed centralized electronic control unit of said vehicle, characterized in that it comprises the following steps: from the electronic wheel unit (5), during a rotation thereof, information defining a given angular position of said wheel at a given instant, and defining a reference angular reference (Rref) of the wheel, derived from said information, fixed with respect to the wheel and corresponding to said given angular position, - subsequently establishing a transmission of said radio signal between the electronic wheel unit (5) and the centralized electronic control unit, such that said signal is transmitted at a predetermined angular position of the wheel calculated from said reference angular reference (Rref).
    [0002]
    Transmission method according to claim 1, wherein said electronic wheel unit (5) comprises means for detecting when the tire rolling strip (6) of the tire (3) is in contact with the ground ( 4) or footprint (2) on the ground of the tire of the wheel, and wherein said information defining a given angular position of said wheel at a given instant, is relative to the footprint (2) on the ground of the tire (3) of wheel.
    [0003]
    Transmission method according to claim 1 or 2, comprising transmitting a plurality of successive radioelectric signals between the electronic wheel unit (5) of a vehicle and the fixed centralized electronic control unit of said vehicle, wherein each of said plurality of successive signals is transmitted at a predetermined angular position different from the wheel, calculated from a reference angular reference (Rref), fixed with respect to the wheel.
    [0004]
    The transmission method according to claim 3, wherein said reference angular reference (Rref) is updated before the transmission of each of the plurality of successive radio signals.
    [0005]
    Transmission method according to claim 3 or 4, wherein a division of one revolution of the wheel into successive base sectors (S1-S8) from a reference angular reference mark (Rref) is further defined. and wherein the step of establishing a transmission of a plurality of successive radio signals between the wheel electronics unit (5) and the centralized electronic control unit is performed such that each of said signals said plurality of signals is transmitted at a predetermined angular position of the wheel, calculated from a reference angular reference (Rref) and said sectoral division of the wheel.
    [0006]
    Transmission method according to claim 5, in which: the time elapsed between the position of the wheel electronic unit (5) at a reference angular reference point (Rref) of the wheel of a wheel is measured. part and an identical position of the electronic wheel unit (5) at the next turn of the wheel on the other hand, making it possible to calculate an angular speed of rotation of the wheel, - a minimum sector of wheel rotation required by the transmission time of a signal between the electronic wheel unit (5) and the centralized electronic control unit, at the calculated rotational angular velocity of the wheel (1), - a transmission angular offset is determined between a first signal and a second signal successive to the first signal, relative to the reference angular reference (Rref), as being equal to the smallest multiple of the basic divisional sector (S1-S8) which covers the time necessary for the transmission of said first sig radio frequency at the calculated rotational angular velocity.
    [0007]
    7. Transmission method according to any one of claims 2 to 6, wherein said information defining a given angular position of said wheel at a given moment, relating to the footprint (2) on the ground of the tire (3) of the wheel, is one of the instants chosen between the instant (t1) where the electronic wheel unit comes into contact with the ground and the instant (t2) where said electronic wheel unit leaves the ground, defining a mark ( Rref) reference angular wheel.
    [0008]
    A transmission method according to any one of claims 5 to 7, wherein said transmission of the signals of the plurality of successive radio signals is performed in a defined sequence so that each of the basic sectors (S1-S8) of one revolution of the wheel is achieved by transmitting at least one of said plurality of signals.
    [0009]
    9. The transmission method according to claim 8, wherein said transmission of the signals of the plurality of successive radio signals is effected in a defined sequence so that said basic sectors (S1-S8) of one revolution of the wheel achieved according to a predetermined sectoral distribution.
    [0010]
    The transmission method according to claim 8, wherein said transmission of the signals of the plurality of successive radio signals is effected in a defined sequence so that said basic sectors (S1-S8) of the wheel are reached in accordance with random sectoral distribution.
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    公开号 | 公开日
    FR3018649B1|2017-06-09|
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    CN106068193B|2018-02-13|
    US9751367B2|2017-09-05|
    US20170001485A1|2017-01-05|
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    法律状态:
    2016-03-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-19| PLFP| Fee payment|Year of fee payment: 7 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452115A|FR3018649B1|2014-03-14|2014-03-14|METHOD FOR TRANSMITTING A RADIO SIGNAL BETWEEN A WHEEL ELECTRONIC UNIT OF A VEHICLE AND A FIXED CENTRALIZED ELECTRONIC CONTROL UNIT OF THE VEHICLE|FR1452115A| FR3018649B1|2014-03-14|2014-03-14|METHOD FOR TRANSMITTING A RADIO SIGNAL BETWEEN A WHEEL ELECTRONIC UNIT OF A VEHICLE AND A FIXED CENTRALIZED ELECTRONIC CONTROL UNIT OF THE VEHICLE|
    CN201580013850.8A| CN106068193B|2014-03-14|2015-03-13|Wheel electronic unit and be attached to vehicle central electronic control unit between transmit radio signal method|
    US15/125,831| US9751367B2|2014-03-14|2015-03-13|Method for transmitting a radio signal between an electronic unit of a vehicle wheel and an electronic centralized control unit attached to the vehicle|
    PCT/EP2015/000560| WO2015135660A1|2014-03-14|2015-03-13|Method for transmitting a radio signal between an electronic unit of a vehicle wheel and an electronic centralized control unit attached to the vehicle|
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