Method for automatically calibrating power of activation signal of at least one sensor and device for implementing method
By automatically determining and storing the activation signal power range of the pressure sensor, the problem of difficult automatic calibration of the sensor activation signal power in the prior art is solved, and a simpler and safer tire replacement process is achieved, as well as more efficient industrial environment operation.
Patent Information
- Application Number
- CN202380077403.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-11-08
- Filing Date
- 2023-10-26
- Publication Date
- 2025-06-13
AI Technical Summary
The prior art is difficult to automatically calibrate the activation signal power of the pressure sensor, resulting in the need to manually pair the sensor when changing the tires, and may activate undesired sensors in industrial environments, affecting operational safety and efficiency.
These power values are automatically stored by determining the maximum transmission power Pmax of the inactivated signal of the sensor and the minimum transmission power Pmin of the activation signal, and when the difference between the two reaches or is less than the predetermined value δ0 to ensure that the sensor is activated only if necessary.
The power of the sensor activation signal is realized automatically calibrated, simplifies the tire replacement process, reduces the need for manual pairing, and reduces the risk of undesired activation in industrial environments, improving operational safety and efficiency.
Smart Images
Figure CN120152860A_ABST
Abstract
Description
[0001] The present invention relates to the field of sensors in the automotive industry, in particular to the field of pressure sensors, and to how to activate such sensors and communicate with them.
[0002] The present invention more particularly relates to a method for automatically calibrating the power of an activation signal for a sensor and an activation device allowing the implementation of this method.
[0003] The present invention is advantageously applicable to pressure sensors arranged (accommodated) in a motor vehicle tire or intended to be accommodated in a motor vehicle tire (e.g. at the rim and / or tube valve). These pressure sensors are typically paired with an on-board computer of the motor vehicle, and the sensors transmit data (e.g. relating to the pressure and / or temperature level of the tire) to this on-board computer of the motor vehicle.
[0004] Thus, the on-board sensor computer assembly is referred to as a "tire pressure monitoring system" (TPMS).
[0005] Each pressure sensor is conventionally equipped with a transmitter, such as a radio frequency transmitter, to allow data to be transmitted to the on-board computer. Thus, if one of the tires has been punctured or if the tire is currently leaking air, posing a threat to the safety of the user, the on-board computer receiving data from the sensor can issue a warning to the vehicle user.
[0006] However, the pressure sensors arranged inside the tire are usually not removable, so replacing a wheel involves replacing the sensor, and in this case, the vehicle on-board computer will not directly detect the new sensor.
[0007] When replacing a tire, it is indeed necessary to pair the sensor accommodated in the new tire with the vehicle on-board computer (or connect it via a radio link). This pairing (or establishing a radio link) is performed by a dedicated activation device (usually denoted by the term "TPMS tool"), which is configured to activate the sensor, retrieve and save the relevant data transmitted by the sensor (such as the sensor identifier), and transmit the relevant data to the on-board computer, so that the on-board computer can detect and locate the sensor accommodated in the newly installed tire and acquire the signal of the sensor in order to warn the user when a pressure drop in one of the tires is detected.
[0008] The sensor activation device can also be used in an industrial environment, namely a manufacturing facility of the sensor, a manufacturing facility of the tire in which the sensor is installed, or a manufacturing facility of a motor vehicle equipped with such a tire.
[0009] Thus, in an industrial environment, it is necessary to activate the sensor for sensor testing, for sensor identification (e.g. for quality monitoring), for sensor configuration and / or for pairing the sensor with the vehicle on-board computer.
[0010] However, facility production lines are often very close to each other, and the activation signals emitted by the adapted activation devices may cause the activation of multiple sensors. Therefore, it is necessary to calibrate the transmission power of such activation devices to avoid reactivating unwanted sensors.
[0011] For example, in a facility, vehicle tires or wheels may:
[0012] - Move along a conveyor belt, where the tires are close enough to each other that the activation signal emitted by the activation device triggers the activation of a sensor disposed within a tire adjacent to the tire being detected;
[0013] - Be mounted on a vehicle, so that the wheels are relatively close to each other, and there is a risk of activating multiple sensors disposed within different wheels of the vehicle, especially if the vehicle (such as a truck) includes dual wheels.
[0014] In addition, the activation signal emitted by the activation device is a continuous or modulated electromagnetic signal, whose frequency is typically 125 kHz. Since these electromagnetic signals may pose potential risks to human health, it is very important to minimize their transmission power (i.e., the energy radiated by the antenna emitting the radio signal). To this end, it is necessary to find a balance between the transmission power value ensuring sensor activation and minimizing the risk to an operator working near the activation device.
[0015] In addition, during the installation of the activation device in an industrial setting, a professional operator needs to be called in to perform the setup of the device. The efficiency and propagation of the activation signal depend closely on the environment (obstacles, echoes, etc.) in which the activation device is set. Therefore, it is necessary to set the activation device such that the power of the signal received by the sensor is sufficient to activate the desired sensor, such as a sensor located at a determined distance on a production line, while limiting the operator's exposure to the activation signal.
[0016] Therefore, an object of the present invention is to solve at least one of the above problems, and thus a novel method for automatically calibrating the power of an activation signal of at least one sensor is proposed. In particular, the novel method is for automatically calibrating the power of an activation signal of a pressure sensor for a motor vehicle tire pressure monitoring system, the sensor having an identification number and including at least one data transmission and reception module, characterized in that the method includes:
[0017] - Determining the maximum transmission power P max of the non-activation signal of the sensor and the minimum transmission power P min of the activation signal of the sensor;
[0018] - Among the power P max and the power Pmin The difference δ between them reaches a value equal to or less than a predetermined value δ 0 When this occurs, the maximum transmission power P max and the minimum transmission power P min are stored in the memory.
[0019] Therefore, any activation signal transmitted at a power less than or equal to the transmission power P max cannot activate the sensor. And any activation signal transmitted at a transmission power strictly greater than the transmission power P min will activate the sensor.
[0020] According to a possible feature, when the difference δ between the power P max and the power P min reaches a value equal to or less than the value δ 0 the determination of the maximum power P max and the minimum power P min is stopped.
[0021] According to another possible feature, the determination of the power P max and the power P min is performed by a dichotomous variation of the power of the activation signal.
[0022] A dichotomous variation refers to changing the power of the activation signal through multiple iterations to determine the bounding range (framing) of the optimal power value for activating one or more sensors under nominal operating conditions.
[0023] According to another possible feature, the transmitted activation signal has a power P i which is the power P i corresponding to the arithmetic mean of the maximum power P max and the minimum power P min This means that during the determination of the maximum power and the minimum power, the transmission power P
[0024] of the activation signal corresponds to i where P and P min and P max are the transmission power values previously stored in the memory, since the maximum transmission power and the minimum transmission power vary according to the results of the previously transmitted signals (and thus according to the results of the power values previously stored in the memory).
[0025] According to another possible feature, the determination of the power P max and P min is performed by according to the previously determined power P iPerformed by detecting, from the at least one sensor, an activation signal transmitted (e.g., by an activation device) and a response signal that is or is not detected (i.e., transmitted by the sensor).
[0026] According to another possible feature, if a response signal is received from the at least one sensor, the power P of the activation signal that has activated the sensor i is identified as the minimum power P min (or the minimum transmission power of the activation signal that has activated the sensor).
[0027] According to another possible feature, if no response signal is received from the at least one sensor, the power P of the activation signal that has activated the sensor i is identified as the maximum power P max (or the maximum power at which the signal has not activated the sensor).
[0028] After a predetermined time T R , it is considered that no response signal has been received, where the time T R is, for example, greater than 5 seconds and preferably greater than 10 seconds. The predetermined time T R generally depends on the type of sensor and on the environment in which the activation and response signals will be propagated.
[0029] According to another possible feature, during the method according to the invention, there is a delay T between each activation signal transmission iteration L .
[0030] In fact, if there is no delay T L , there is a risk of detecting the activation of the sensor by an activation signal from a previous step or iteration. Thus, the previous activation at power P i-1 can be interpreted as an activation at power P i , thus corrupting all results. Advantageously, the delay is configurable and depends on the type of sensor and on the environment in which the sensor is located. The delay is, for example, set between 0.5 seconds and 1.5 seconds and preferably is substantially equal to 1 second.
[0031] According to another possible feature, there is an initialization of the method, during which the initial value of the maximum power P max of the non-activation signal, the initial value of the minimum power P min of the activation signal, and / or the initial value of the difference δ max between the maximum power P min and the minimum power P 0 are predetermined.
[0032] Note that the initial value of the maximum power P max the initial value of the minimum power P min and the initial value of the power difference δ 0 can also be default values. For example, the maximum transmission power can correspond to the maximum power at which the activation device can emit an activation signal, the minimum transmission power can correspond to the minimum power at which the activation device can emit an activation signal, and the power difference δ 0 is equal to 5% (i.e., the relative difference between the power at which the activation device can emit the minimum signal and the maximum signal is equal to 5%).
[0033] According to another possible feature, the sensor is pre-identified by transmitting the activation signal at the determined power (e.g., at the maximum transmission power at which the activation device can emit a signal).
[0034] According to another possible feature, the identification number of each sensor among the sensors that have emitted a signal in response to the activation signal for identification is stored in the memory.
[0035] Therefore, within the scope of calibrating multiple sensors simultaneously, for example, in the case of dual wheels, it is necessary to calibrate the power of the activation signal for each sensor among the sensors, and thus it is necessary to calibrate the power of the activation signals of the sensors located at different spatial positions. For this purpose, it can be advantageous to associate a location with each sensor identifier and determine whether the sensor has been activated based on whether a signal has been received from the sensor (after the activation device transmits the activation signal).
[0036] According to another possible feature, the sensor (and the identifier of the sensor) is associated with a location, for example, determined based on the (received) power of the response signal after the activation signal.
[0037] According to another possible feature, the identification number of each sensor among the sensors is pre-manually stored in the memory.
[0038] The present invention also relates to a device for activating at least one sensor, in particular, the device is used for activating a pressure sensor for a motor vehicle tire pressure monitoring system, and the device includes:
[0039] - at least one sensor activation module;
[0040] - a module for receiving signals from the sensors;
[0041] - an electronic entity configured to store and / or process the information carried by the signals emitted by the sensors;
[0042] - A module for communicating with a remote electronic entity, the module being configured to transmit information carried by a received signal, for example, the remote electronic entity being an in-vehicle computer of a motor vehicle;
[0043] Characterized in that the device is configured to: on the one hand, determine a maximum transmission power P of the deactivation signal of the at least one sensor max and a minimum transmission power P of the signal that causes the at least one sensor to activate min ; and on the other hand, when a difference δ between the power P max and the power P min reaches a value equal to or less than a predetermined value δ 0 , stop determining the maximum power P max and the minimum power P min .
[0044] According to another possible feature, the sensor is a pressure and / or temperature sensor housed in a motor vehicle tire.
[0045] The present invention will be better understood through the following description of specific embodiments of the present invention given only by way of non-limiting examples and with reference to the accompanying drawings, and other objects, details, features, and advantages of the present invention will become more apparent, wherein:
[0046] - Figure 1 , labeled as
Figure 1
[0047] - Figure 2 , labeled as
Figure 2
[0048] - Figure 3 , labeled as
Figure 3
[0049] - Figure 4 , labeled as
Figure 4
[0050] - Figure 5 , labeled as
Figure 5
Figure 4
[0051]
Figure 1
[0052] On the one hand, motor vehicle 5 is equipped with tires 7 in which sensors 9, such as pressure sensors, are accommodated; on the other hand, motor vehicle 5 includes an on-board computer 11 (also referred to as an electronic control unit, usually abbreviated as "ECU").
[0053] Device 1 includes, for example, a unit 13 made of plastic, a display device 15, a keyboard 17, an antenna 19 for transmitting a sensor activation signal, and an OBD socket 21. The OBD socket 21 is configured such that device 1 can be connected, for example, to the on-board computer 11 of the vehicle, in particular by an OBD cable or using a wireless (e.g., Bluetooth) adapter to connect device 1 to the on-board computer 11 of the vehicle.
[0054]
Figure 2
[0055] Thus, device 1 includes:
[0056] - at least one sensor activation module 31, such as a device or module for generating (continuous and / or modulated) sensor activation signals, the activation module 31 particularly including antenna 19 which enables the generated signal to be radiated to sensor 9;
[0057] - module 33 for receiving signals from the sensor, usually including an additional antenna accommodated in unit 13, and module 33 is configured to pick up signals, for example, in a frequency band between 300 MHz and 500 MHz (the sensor emits signals in this frequency band after being activated by activation module 31);
[0058] - an electronic entity 35 configured to store and / or process information carried by the signals emitted by sensor 9 (and received by receiving module 33);
[0059] - module 37 for communicating with the on-board computer 11 of the motor vehicle to transmit information from at least one of the sensors 9, the information being received through signals from sensor 9.
[0060] The communication module 37 is, for example, an OBD module. The communication module 37 includes an OBD communication management circuit 38 and the aforementioned OBD socket 21. It should be noted that the management circuit 38 can also be integrated in the electronic entity 35. In addition, the device 1 further includes a battery 41, which is configured to supply power to different components (and electronic parts) of the device 1.
[0061] In addition, it should be noted that the activation signal (emitted by the activation device) is a continuous or modulated electromagnetic signal emitted by the activation module 31, and the electromagnetic signal has a frequency of, for example, 125 kHz.
[0062] As shown in
Figure 1
Figure 2
[0063] Different from the device in
Figure 1
Figure 3
[0064] Therefore, the activation device 1' can include all the elements mentioned for the Figure 1 activation device before.
[0065] However, different from the Figure 1 activation device 1, the activation device 1' for industrial applications usually does not include a screen, a keyboard, or an OBD communication module, etc. A third-party electronic device (for example, through the communication module 37' of the device 1') connected to the device 1' can be used to program and communicate with the device 1'.
[0066]
Figure 3
[0067] The activation device 1 or 1' is configured to emit an activation signal, for example, towards at least one sensor 9 or C 1 to emit an activation signal, and the at least one sensor 9 or C 1 is optionally accommodated in the tire 7 or P. When the sensor 7 or C 1 is activated by the activation signal, the sensor 7 or C 1 then emits one or more response signals.
[0068] At least one sensor 7 or C 1 (Here is a pressure sensor for a motor vehicle tire pressure monitoring system) includes at least one data transmission and reception module and an identification number.
[0069] Regardless of the application, it is advantageous to calibrate the power of the activation signal emitted by the activation devices 1, 1' in order to limit the operator's exposure to electromagnetic waves and optimize the power consumption of the devices 1, 1'.
[0070] To this end, the devices 1, 1' are configured to execute method 100 to automatically calibrate the transmission power of the activation signal of at least one sensor 9.
[0071] The method 100, more particularly the method 100 as shown in
Figure 4
[0072] - Determining S the maximum power P of the non-activation signal of the sensor max and the minimum power P of the activation signal of the sensor min ; det
[0073] - When the difference δ between the power P max and the power P min reaches a value equal to or less than a predetermined value δ 0 (for example, the relative difference is less than or equal to 5%), storing S the maximum power P max and the minimum power P min in the memory. mem
[0074] Therefore, when the difference δ (δ equals P min –P max ) ≤ δ 0 , the values of the maximum power P max and the minimum power P min are saved in the memory (for example, the random access memory or read-only memory of the electronic entity 35), such that the value of the minimum power P min is used under the nominal use conditions of the activation device 1 or 1'.
[0075] The method 100 further includes a preliminary initialization step S init , during which the initial value of the maximum power P of the non-activation signal, the initial value of the minimum power P of the activation signal, and the initial value of the difference δ max between the maximum power P min and the minimum power P max are pre-determined and / or manually input. min 0
[0076] At the power P max and P min when the difference δ therebetween reaches a value equal to or less than the difference δ 0 , the determination of the maximum power P max and the minimum power P min is stopped.
[0077] It should be noted that the smaller the difference δ, the larger the applicable range of the method according to the present invention. In addition, the closer the position of the sensor for which the minimum activation power needs to be determined is to other sensors, the smaller the value of the difference δ needs to be to avoid activating nearby sensors.
[0078] More particularly, the determination S max of the maximum power P min and the minimum power P det includes a plurality of sub-steps, and these sub-steps can be iterated until the difference δ is less than or equal to δ 0 .
[0079] Once the initial values of the parameters P min , P max and δ 0 are set, a sensor activation signal S i is transmitted, and the sensor activation signal S i has a power P i corresponding to the arithmetic mean of the values of the maximum power P max and the minimum power P min , that is, here
[0080] Within a predetermined time after transmitting the activation signal S i , a response signal S C from at least one sensor is detected or not detected (a response signal transmitted in response to the transmitted activation signal S i ). For example, it can be considered that no response signal is received after a predetermined time T R , and the time T R is, for example, greater than 5 seconds and preferably between 5 seconds and 10 seconds.
[0081] Thus, if the activation devices 1, 1' detect that a response signal S C from at least one sensor has been received, there is a step S min to update the power value P 2 , then the power P i of the previously transmitted activation signal becomes the new minimum power value P min , and the value of the parameter P min is modified for the next transmission of the activation signal S i。
[0082] However, if the activation devices 1, 1' do not detect the reception of a response signal S from at least one sensor C (within a predetermined time T R ), then the value of the power P of the previously transmitted activation signal i will become (step S 3 ) the new value of the maximum power P max , and the value of the parameter P max is modified for the next transmission of the activation signal S for the sensor 9 i .
[0083] After modifying one of the values of the parameter P min or P max , in particular during step S 2 or S 3 , then the difference δ between the values of the minimum power P min and the maximum power P max is calculated. More particularly, the difference δ = P min - P max .
[0084] Then the difference δ thus calculated is compared with a predetermined value δ 0 (or the target value of the difference) in step S 5 . If the calculated value δ is greater than the predetermined value δ 0 , then steps S 1 and S 2 , or S 1 and S 3 are executed for a new iteration. Thus, depending on whether step S 2 or S 3 was executed during the previous iteration, considering the modified value of either the minimum power P min or the maximum power P max , a new activation signal S i is transmitted at the power P i .
[0085] Therefore, the determination of the powers P i and P i is performed by a dichotomous variation of the power P max of the activation signal S min , because there is an iteration of the change in the power P i of the activation signal S i , and the change in power is based on the arithmetic mean of the minimum power P min and the maximum power P max .
[0086] More particularly, there then exists an iteration of the actions performed during steps S 1 to S 5 until the value of the calculated difference δ is less than or equal to a predetermined value δ 0 . When this condition is satisfied, the minimum power P min and the maximum power P max correspond to the best values found and are then stored in the memory during step S mem .
[0087] In an alternative embodiment of the method of Figure 4 , particularly when there are multiple sensors, such as in the case of a two-wheel vehicle, the transmission power of the activation signal for each of the sensors is calibrated, where these sensors are typically located at different spatial positions. This means that, in addition to its identifier, the value of the maximum power P max , the value of the minimum power P min , and the predetermined value δ 0 are also advantageously associated with each sensor.
[0088] Furthermore, each sensor has a specific identifier, and advantageously, the spatial position (e.g., the position n°1 of the nearest sensor, the position n°2 of the second nearest sensor, etc.) is associated with the sensor (and its identifier). The association between the sensor (and its identifier) and the position is determined, for example, based on the (received) power of the response signal emitted in response to the reception of the activation signal.
[0089] Thus, different from method 100, a set of response signals emitted by different sensors may or may not be received, and each response signal carries the identifier of the sensor that emits the response signal in response to the reception of the activation signal emitted by the activation devices 1, 1' and the corresponding update of the values of the maximum power P max and the minimum power P min .
[0090] This means that for a given power P i of the activation signal, when the sensor does not emit a response signal within a predefined response time T R , the value of the maximum non-activation power P max is updated, and if a response signal is received, the value of the minimum activation power P min is updated.
[0091] There is an iteration of the different steps of method 100, so the activation signal is transmitted before the sets of values of the maximum power P max and the minimum power P min for each of the sensors have been determined, such that the power P maxand P min the difference with is less than or equal to a predetermined value δ 0 .
[0092] Therefore, for each sensor in the sensor, at the activation signal P i (and successive activation signal transmission iterations), according to whether the signal (carrying an identifier or identification number) is received or not received from the sensor transmitting the signal, the activation or non-activation of each sensor in the sensor is successively determined.
[0093] Once, for a given sensor, the maximum power P 0 less than or equal to the predetermined value δ max and the minimum power P min are obtained, the difference δ between them, the transmission power value is stored in the memory, and the sensor is no longer considered in the next activation signal transmission iteration. This continues until the set of differences δ between the maximum power P max and the minimum power P min for each sensor in the sensor is less than or equal to the predetermined value δ 0 .
[0094] Figure 5 is in itself Figure 4 a flowchart of an alternative implementation of the method of Figure 5 The method 100' of Figure 4 has substantially the same steps as the method of
[0095] Therefore, different from the method 100, Figure 5 the method 100' in init includes, after initialization S id detecting the sensors to be activated S m Actually, the method according to the present invention is also used to calibrate the activation signals for a plurality of sensors C
[0096] For this purpose, a plurality of sensors seeking to calibrate the activation signal are pre-identified.
[0097] Therefore, after initialization S init it is verified S 6 whether there is an identification number (or identifier) Id associated with each of the sensors in the memory.
[0098] If the sensor identifier is not stored in the memory, a so-called activation signal for identification of the power P i is transmitted S 7 , for example, at the maximum possible transmission power at which the activation device can emit a signal.
[0099] Then, within a predetermined time, for example T R , the response signal emitted by the sensor is received S 8 . The response signal carries the identification number (or identifier) of the sensor, and then the identification number (or identifier) of each sensor that has emitted a response signal to the activation signal for identification is stored S 9 in the memory.
[0100] Then, the maximum power P max of the non-activation signal of the sensor and the minimum power P min of the sensor activation signal are determined S det .
[0101] Different from the method 100 of
Figure 4
[0102] - If a response signal S c is received from a set of sensors stored in the memory, the value of the power P i of the previously transmitted activation signal becomes (step S 2 ) the new minimum power value P min , and the value of the parameter P min is modified for the transmission of the next activation signal S i ;
[0103] - If no response signal S R is received from a set of sensors stored in the memory (within the predetermined time T C ), the value of the power P i of the previously transmitted activation signal becomes (step S 3 ) the new maximum power value P max , and the value of the parameter P max is modified for the transmission of the next activation signal S i .
[0104] Subsequently, as before, the difference δ between the minimum power P min and the maximum power P max is calculated S 4 , and compared with a predetermined value δ 0 S 5 .
[0105] If the calculated value of the difference δ is greater than the predetermined value δ 0 , then steps S 1 and S 2 , or S 1 and S 3 are implemented for a new iteration. Thus, a new activation signal S i for the transmit power P i is considered, but taking into account a modified value of either the minimum power P min or the maximum power P max .
[0106] Otherwise, i.e., when the difference δ of the power is equal to or less than the predetermined value δ 0 , the determination of the transmission power is stopped and the values of the maximum power P max and the minimum power P min are stored in a memory, for example in the random access memory or read-only memory of the electronic entity 35. This is in particular so that the value of the minimum power P min is used under the nominal operating conditions of the activation of the device 1 or 1'.
[0107] It should be noted that in an alternative embodiment of the method 100', the identification number can be entered manually or sorted manually by the user after transmitting an identification signal and receiving a response signal.
[0108] In a further alternative embodiment, not shown, of the methods 100 and 100', the activation signal used under the normal operating conditions of the activation of the device 1 or 1' has a transmission power corresponding to the minimum power P min stored in the memory, which transmission power is increased by a predetermined percentage, for example by 10%, to ensure activation of the sensor.
Claims
1. A method for automatically calibrating at least one sensor (C 1 ), in particular, the method is used for automatically calibrating the power (Pi) of an activation signal (Si) of a pressure sensor of a tire pressure monitoring system (7) of a motor vehicle (5), the sensor (C 1 ) has an identification number (Id) and the sensor (C 1 ) comprises at least one data transmission and reception module, Characterized in that, The method (100, 100') includes: - Determine the maximum transmission power P of the non - activation signal of the sensor max and the minimum transmission power P of the activation signal of the sensor min (Sdet); - when the difference δ between the power P max and the power P min reaches a value equal to or less than a predetermined value δ 0 the maximum transmission power P max and the minimum transmission power P min are stored (Smem) in the memory.
2. The method (100, 100') according to the previous claim, Characterized in that, When the difference δ between the power P max and the power P min reaches a value equal to or less than the value δ 0 , the determination (Sdet) of the maximum power P max and the minimum power P min is stopped.
3. The method (100, 100') according to the previous claim, Characterized in that, For the power P max and the power P min the determination (Sdet) is performed by a dichotomic variation of the power (Pi) of the activation signal (Si).
4. The method (100, 100') according to any one of the preceding claims, Characterized in that, For the power P max and the power P min the determination (Sdet) is performed by detecting or not detecting at least one response signal (Sc) from the at least one sensor based on an activation signal (Si) previously transmitted at the power P i 5. The method (100, 100') according to the previous claim, Characterized in that, If a response signal (Sc) is received from the at least one sensor (C1), the power P of the activation signal (Si) that has activated the sensor (C1) is i identified as the minimum power P min .
6. The method (100, 100') according to claim 4 or 5, Characterized in that, If no response signal (Sc) is received from the at least one sensor (C1), the power P of the transmitted activation signal (Si) i is identified as the maximum power P max .
7. The method (100, 100') according to any one of the preceding claims, Characterized in that, There is an initialization (Sinit) of the method, during which the maximum power P of the non-activated signal max of the initial value, the minimum power P of the activation signal (Si) min of the initial value, and the maximum power P max and the minimum power P min The difference δ 0 of the initial value is pre-determined.
8. The method (100, 100') according to any one of the preceding claims, Characterized in that, The transmitted activation signal (Si) has a power P i , said power P i corresponding to the arithmetic mean of the maximum power P max and the minimum power P min .
9. The method (100, 100') according to any one of the preceding claims, Characterized in that, The sensor is pre-identified by transmitting (S7) an activation signal (Si) at a power Pi.
10. The method (100, 100') according to the previous claim, Characterized in that, The identification number (Id) of each sensor that has transmitted a signal in response to the activation signal for identification is stored (S9) in a memory.
11. The method (100, 100') according to any one of the preceding claims, Characterized in that, The identification number (Id) of each sensor in the sensor (C 1 ) is manually stored in the memory in advance.
12. A device (1; 1') for activating at least one sensor, in particular, the device is used to activate a pressure sensor of a tire pressure monitoring system (7) of a motor vehicle (5), The device Comprises: - At least one sensor activation module (31); - A module (33) for receiving signals from the sensors; - An electronic entity (35) configured to store and / or process information conveyed by signals transmitted by the sensors (9); - A module (37; 37') for communicating with a remote electronic entity, the module (37; 37') is used to transmit information carried by the received signals, for example, the remote electronic entity is an on-board computer (11) of a motor vehicle (5); Characterized in that the device is configured to: on the one hand, determine the maximum transmission power P of the deactivation signal of the at least one sensor max and the minimum transmission power P of the signal that causes the at least one sensor to be activated min ; and on the other hand, when the difference δ between the power P max and the power P min reaches a value equal to or less than a predetermined value δ 0 , stop the determination (Sdet) of the maximum power P max and the minimum power P min .