Motor vehicle computer for detecting theft of a wheel

Abstract

The invention relates to a method for signaling the theft of a wheel (10) of a motor vehicle (1), the vehicle (1) comprising: a plurality of wheels (10); and a computer (30), wherein at least one of the wheels (10) comprises a sensor (20), the method being characterized, for at least one wheel (10), in that it comprises the following steps: measuring at least one internal pressure value of the tire of the wheel (10), detecting that the vehicle (1) has been lifted if the absolute value of the difference between the at least one measured internal pressure value and a predetermined reference internal pressure value is greater than a predetermined pressure difference threshold, detecting the detachment of the wheel (10) when it is detected that the vehicle (1) has been lifted, signaling the theft of the wheel (10) when it is detected that the wheel (10) has been detached.

Description

Technical Field

[0001] This invention relates to the field of sensors for motor vehicles, and more particularly to a wheel sensor that allows the detection of wheel theft in a motor vehicle. Background Technology

[0002] Stealing a vehicle wheel involves several steps. First, the vehicle needs to be lifted, for example, with the help of a jack. Then, the clamping bolts need to be removed from the wheel, and finally, the wheel itself needs to be removed.

[0003] Currently, wheel anti-theft systems are known to be installed on vehicles to prevent wheel theft.

[0004] In the first solution, the wheel anti-theft system includes anti-theft nuts installed on each wheel of the vehicle. A suitable unlocking key is used to install or remove the anti-theft nuts.

[0005] In the second solution, the anti-theft system is a system used to detect when the vehicle has been lifted. When the lifting of the vehicle is detected, the anti-theft system will activate an alarm that can be heard by anyone near the vehicle and is intended to scare away thieves.

[0006] However, both solutions have drawbacks.

[0007] First, the key used to unlock the anti-theft bolts is usually kept in the vehicle by the owner. Therefore, a thief can obtain the unlocking key simply by prying open the car. Furthermore, a thief can also possess a copy of the unlocking key.

[0008] The lifting system, being an additional system in itself, proves to be particularly expensive.

[0009] Therefore, a solution is needed that at least partially overcomes these shortcomings. Summary of the Invention

[0010] Therefore, the present invention first relates to a method for signaling the theft of wheels of a motor vehicle, the vehicle comprising: a plurality of wheels; and a computer, wherein at least one of the wheels includes a sensor, and for at least one wheel, the method comprises the following steps:

[0011] - Measure at least one internal pressure value of the wheel's tire;

[0012] - The vehicle is detected to have been lifted when the absolute value of the difference between at least one measured internal pressure value and a predetermined reference internal pressure value is greater than a predetermined pressure difference threshold.

[0013] - When vehicle lifting is detected, wheel detachment is detected;

[0014] - When a wheel is detected to be detached, a signal is sent to report that the wheel has been stolen;

[0015] The method is characterized in that the step of detecting wheel detachment includes the following steps:

[0016] - In a mode called "lift" mode, the sensor periodically sends a lift detection signal to the computer whenever a lift of the vehicle is detected.

[0017] - The computer receives the transmitted lift detection signal;

[0018] -Measure the strength of the received lift detection signal;

[0019] - If at least one measured strength value is less than a predetermined strength threshold, the computer detects wheel detachment.

[0020] This method allows the theft of a vehicle's wheels to be detected, and, where applicable, notifies the vehicle's owner or user of the theft. This method, implemented without requiring expensive additional equipment or unlocking tools, is actually implemented using a computer already present in the vehicle and at least one sensor.

[0021] Therefore, this method allows for simple and rapid detection of wheel detachment from the vehicle, as the measurement of signal strength is simple and quick to implement.

[0022] According to another embodiment, wheel detachment is detected if the absolute value of the difference between the measured strength value and a predetermined reference strength value is greater than a predetermined strength change threshold.

[0023] Advantageously, at least one of the transmitted lift detection signals is a radio frequency (RF) signal.

[0024] Radio frequency signals are easy to use.

[0025] According to another embodiment, wheel detachment is detected if the absolute value of the difference between at least one measured strength value and a predetermined second reference strength value is greater than a predetermined second strength change threshold.

[0026] Advantageously, during the wheel detachment detection step, the computer is configured to send a notification signal to the vehicle user in the event of wheel theft. For example, the notification signal could be a text message sent to the vehicle user's smartphone.

[0027] Therefore, this method allows vehicle users to be notified to try to stop thieves from stealing the wheels of their vehicles, or to notify law enforcement agencies.

[0028] According to another embodiment, during the step of detecting wheel detachment, the sensor is configured to signal a wheel theft, for example, by sending a notification signal to the vehicle user.

[0029] The present invention also relates to a computer program product, characterized in that it includes a set of program code instructions that, when executed by one or more processors, configure one or more processors to implement the method described above.

[0030] The present invention also relates to a sensor for a motor vehicle, the vehicle comprising: a plurality of wheels and a computer, the sensor being intended to be mounted in the wheels of the vehicle, the sensor being configured to:

[0031] - Measure at least one internal pressure value of the wheel's tire;

[0032] - If the absolute value of the difference between at least one measured internal pressure value and a predetermined reference internal pressure value is greater than a predetermined pressure difference threshold, then the vehicle has been detected as lifted.

[0033] - Transmit the lift detection signal to the computer;

[0034] - In lift mode, the acceleration along the wheel rotation axis is measured periodically;

[0035] - When the absolute value of the measured acceleration change is greater than a predetermined acceleration change threshold, wheel detachment is detected;

[0036] - When a wheel is detected to be detached, a signal is sent to report that the wheel has been stolen.

[0037] According to another embodiment, the sensor is configured to:

[0038] - Send at least one lift detection signal to the computer;

[0039] - Periodically receive response signals transmitted by the computer;

[0040] - Measure the strength of each received response signal;

[0041] - If at least one measured strength value is less than a predetermined second strength threshold, wheel detachment is detected;

[0042] - When a wheel is detected to be detached, a signal is sent to report that the wheel has been stolen.

[0043] Preferably, the sensor is configured to report theft by sending a signal to a computer that detects the wheel has come off track.

[0044] Preferably, the sensor is configured to signal a theft by sending a notification signal to the vehicle user.

[0045] The present invention also relates to a motor vehicle comprising: a plurality of wheels, and a computer, wherein at least one of the wheels includes a sensor, and the computer and at least one sensor are configured to implement the method described above. Attached Figure Description

[0046] Other features and advantages of the invention will become apparent after reading the following description. This description is purely illustrative and must be read with reference to the accompanying drawings, in which:

[0047] Figure 1 An embodiment of a vehicle according to the present invention is illustrated schematically;

[0048] Figure 2 An embodiment of the method according to the present invention is illustrated schematically. Detailed Implementation

[0049] refer to Figure 1 An embodiment of the vehicle 1 according to the present invention will be described.

[0050] The vehicle 1 includes multiple wheels 10 and at least one computer 30, which includes a receiving module, and in particular a radio frequency receiving module.

[0051] Each wheel 10 of vehicle 1 includes a tire.

[0052] At least one of the wheels 10 of vehicle 1 includes a sensor 20. Preferably, each wheel 10 of vehicle 1 includes a sensor 20.

[0053] Sensor 20 is specifically mounted on the inflation valve of the tire of wheel 10. For example, sensor 20 is a temperature and pressure sensor, commonly referred to as a "TPMS" (Tyre Pressure Monitoring System), which is known to those skilled in the art and will not be described in further detail herein.

[0054] Sensor 20 is connected to computer 30, particularly via a wireless communication link. More specifically, a first wireless communication link, particularly a radio frequency (RF) communication link, allows sensor 20 to send signals to computer 30. Conversely, a second communication link, particularly a low frequency (LF) communication link, allows computer 30 to send signals to sensor 20.

[0055] Sensor 20 is specifically configured to detect the stationary position of the vehicle. In other words, sensor 20 detects that vehicle 1 is indeed stationary, and that the vehicle is not simply temporarily stopped. To this end, sensor 20 detects when vehicle 1 stops, and then detects when vehicle 1 has been stopped for a duration greater than a predetermined transition time d. t(Predefined transition duration d) t For example, the duration (e.g., equal to 15 minutes).

[0056] To check whether vehicle 1 is stationary, sensor 20 can also be configured to measure the temperature inside the tires, i.e., the temperature of the gas occupying the internal volume of wheel 10. If the measured temperature value is less than a predetermined resting temperature, sensor 20 is configured to confirm that vehicle 1 is stationary.

[0057] The resting temperature limit is set when the duration of vehicle 1's stop exceeds a predetermined transition duration d. t The temperature reached by each tire when the vehicle 1 is stationary. For example, the resting temperature is 40°C.

[0058] Sensor 20 includes a storage area in which the resting temperature value is recorded.

[0059] When sensor 20 has detected that vehicle 1 is stationary, sensor 20 is configured to measure the initial reference internal pressure P in the tire of wheel 10. ref_init The value of .

[0060] Similarly, sensor 20 is configured to measure the initial reference temperature T in the tire of wheel 10. ref init The value of .

[0061] The initial reference internal pressure P measured ref_init The value and the initial reference temperature T measured ref_init The value is also recorded in the storage area of ​​sensor 20.

[0062] Sensor 20 is also configured to transmit an presence signal s to computer 30 via a first wireless communication link. p Especially when sensor 20 has detected that vehicle 1 is stationary. A signal s exists. p This includes an identifier that allows computer 30 to identify which sensor 20 and therefore which wheel 10 has transmitted a presence signal. p There exists a signal s. p It also includes the initial reference temperature T measured. ref_init The initial reference internal pressure P measured ref_init And notify the computer 30 and sensor 20 that the vehicle 1 has been detected as stationary.

[0063] Furthermore, sensor 20 is configured to check whether the tire of the wheel 10 to which sensor 20 belongs is adequately inflated. For this purpose, sensor 20 is configured to measure the internal pressure P of the tire of wheel 10. 10That is, the pressure of the gas occupying the internal volume of wheel 10. Then, if the internal pressure P is measured... 10 If the value is greater than a predetermined minimum inflation threshold, the tire is correctly inflated. The minimum inflation threshold is specifically equal to 300 kPa. The value of the minimum inflation threshold is also recorded in the storage area of ​​sensor 20.

[0064] Furthermore, sensor 20 is also configured to check the stability of the temperature in the tire of the wheel 10 to which sensor 20 belongs. For this purpose, sensor 20 measures the temperature value in the tire again. Sensor 20 is configured to check the temperature measured in the tire and the initial reference temperature T determined for said tire. ref_init The temperature is considered stable when the absolute value of the difference between the two is less than a predetermined temperature threshold. The temperature threshold is, for example, equal to 3°C, and the value of the temperature threshold is recorded in the storage area of ​​sensor 20.

[0065] Sensor 20 can also be configured to determine a reference temperature value T by measuring the temperature inside the tire, for example, every 30 seconds or 60 seconds. ref Reference temperature T ref Corresponding to the initial reference temperature T ref_init Update the value.

[0066] In addition, when the reference temperature value T has been measured ref At this time, sensor 20 is configured to recheck temperature stability by re-measuring the temperature value in the tire. Sensor 20 is configured to... ref When the absolute value of the difference between the two is less than the temperature threshold, the temperature is considered stable.

[0067] Sensor 20 is also configured to operate in a mode called "monitoring" mode, which is used to monitor the tires of the wheel 10 to which sensor 20 belongs. In monitoring mode, sensor 20 is configured to detect that the wheel 10 to which sensor 20 belongs has been lifted relative to the ground. Therefore, "lifting" also refers to the partial or complete lifting of vehicle 1 relative to the ground.

[0068] Therefore, in monitoring mode, sensor 20 is configured to periodically (e.g., every 4 seconds) measure the internal pressure P of the tires of wheel 10. 10 This is to detect whether vehicle 1 has been raised. More specifically, sensor 20 is configured to detect if the measured internal pressure value P... 10 and initial reference internal pressure P ref_init If the absolute value of the difference between the values ​​is greater than a predetermined pressure difference threshold, then vehicle 1 is detected to have been lifted. The predetermined pressure difference threshold is specifically equal to 1.5 kPa, and its value is recorded in the storage area of ​​sensor 20.

[0069] Sensor 20 is specifically configured to periodically measure the reference internal pressure value P. ref For example, by measuring the tire's internal pressure every 30 seconds or every 60 seconds. Refer to the internal pressure value P. ref Specifically corresponding to the initial reference internal pressure value P ref_init Update.

[0070] Similarly, when sensor 20 has measured the internal reference pressure P ref When a new value is obtained, sensor 20 is configured to periodically (specifically every 4 seconds) measure the tire internal pressure P again. 10 The value of P is used to detect that vehicle 1 has been lifted. 10 and the determined reference internal pressure value P ref If the absolute value of the difference between the two is greater than a predetermined pressure difference threshold, then the lifting of vehicle 1 is detected by sensor 20.

[0071] According to another example, sensor 20 is configured to, if the measured internal pressure P 10 Reduce, in other words, if the measured internal pressure P 10 If the change is negative, then vehicle 1 has been detected as having been lifted.

[0072] After detecting that vehicle 1 has been lifted, sensor 20 is configured to operate in a mode called "lift" mode.

[0073] According to a first embodiment of sensor 20, when sensor 20 is operating in lift mode, sensor 20 is configured to periodically transmit a lift detection signal to computer 30 via a first communication link whenever a lift of vehicle 1 is detected. For example, sensor 20 transmits a lift detection signal every 4 seconds.

[0074] The lift detection signal specifically includes an identifier that allows the computer 30 to identify which sensor 20 sent the lift detection signal, lift information (indicating that a lift has been detected), and at least one wake-up stimulus to ensure that the receiving module of the computer 30 is in a wake-up state for receiving the identifier and lift information.

[0075] According to a second embodiment of sensor 20, sensor 20 operating in lift mode is configured to transmit a lift detection signal as described in the first embodiment to computer 30 via a first communication link. Sensor 20 is then configured to periodically receive response signals from computer 30 via a second communication link. Sensor 20 is then configured to measure the intensity of each received response signal. Specifically, this intensity corresponds to RSSI (Received Signal Strength Indication).

[0076] Finally, sensor 20 is configured to detect if at least one measured intensity value matches a predetermined second reference intensity value P. RSSI_ref2 If the absolute value of the difference between the two is greater than a predetermined second intensity change threshold, then the wheel 10, including sensor 20, is detected to have detached from vehicle 1.

[0077] Removing wheel 10 from vehicle 1 means removing wheel 10 from vehicle 1 and removing wheel 10 from vehicle 1.

[0078] Second reference intensity value P RSSI_ref2 This can be predetermined by the manufacturer. In another embodiment, sensor 20 is configured to determine a second reference intensity value P. RSSI_ref2 Specifically, this is achieved by measuring the intensity of the first response signal received by sensor 20. In both of the above cases, the reference intensity value P RSSI_ref2 It is recorded in the storage area of ​​sensor 20.

[0079] For example, a predetermined second intensity change threshold is equal to 5 dBm. The value of the second intensity change threshold is specifically recorded in the storage area of ​​sensor 20.

[0080] According to another example, sensor 20 is configured to detect wheel 10 detachment if the measured intensity value is less than a predetermined second intensity threshold. In the present case, the predetermined second intensity threshold is specifically equal to -34 dBm. The value of the second intensity threshold is specifically recorded in the storage area of ​​sensor 20.

[0081] If wheel 10 is detected to have detached, sensor 20 is configured to send at least one detachment detection signal to computer 30 via a first communication link, indicating that wheel 10 has detached from the vehicle and therefore wheel 10 has been stolen.

[0082] According to another example, if wheel 10 is detected to be detached, sensor 20 is configured to send a notification of wheel 10 theft to the driver or user of vehicle 1 whose wheel 10 has been stolen.

[0083] According to a third embodiment of sensor 20, sensor 20 operating in lift mode sends a lift detection signal as described in the first embodiment of sensor 20 to computer 30 via a first communication link to notify computer 30 that lift has been detected.

[0084] In addition, sensor 20 is configured to periodically measure the acceleration of the wheel 10 to which sensor 20 belongs along the axis of rotation of wheel 10.

[0085] In addition, sensor 20 is configured to send each measured acceleration value to computer 30 via a first communication link.

[0086] Furthermore, sensor 20 is configured to determine a reference acceleration value and send the determined reference acceleration value to computer 30, for example, by comparing the reference acceleration value with an existence signal s. p Combined.

[0087] According to the fourth embodiment of sensor 20, sensor 20 operating in lift mode sends a lift detection signal as described in the first embodiment of sensor 20 to computer 30 via a first communication link to notify computer 30 that lift has been detected.

[0088] In addition, sensor 20 is configured to periodically measure the acceleration of the wheel 10 to which sensor 20 belongs along the axis of rotation of wheel 10.

[0089] Sensor 20 is also configured to detect wheel 10 detaching from vehicle 1 if the absolute value of the measured acceleration change is greater than a predetermined acceleration change threshold. In the present case, the acceleration change threshold is, for example, equal to 0.4g, and its value is recorded in the storage area of ​​sensor 20.

[0090] According to another example, sensor 20 is configured to detect wheel 10 detachment if the absolute value of the difference between at least one measured acceleration value and a predetermined reference acceleration value is greater than a predetermined acceleration change threshold.

[0091] The reference acceleration value is determined in particular by sensor 20.

[0092] In yet another example, sensor 20 is configured to detect wheel 10 detachment if the absolute value of the measured acceleration is greater than a predetermined acceleration threshold. In this case, the predetermined acceleration threshold is specifically equal to 1.5g, and its value is recorded in the storage area of ​​sensor 20.

[0093] If wheel 10 is detected to have detached, sensor 20 is configured to send at least one detachment detection signal to computer 30 via a first communication link.

[0094] According to another example, if wheel 10 is detected to be detached, sensor 20 is configured to send a notification of wheel 10 theft to the driver or user of vehicle 1, whose wheel 10 has been stolen. For example, sensor 20 via... The communication link is connected to the driver's or user's telephone in vehicle 1, and via the... Messages are transmitted via the communication link.

[0095] The sensor 20 is configured to operate in lift mode whenever lift is detected, or to operate for a predetermined duration ranging from 3 to 30 minutes, preferably from 4 to 5 minutes.

[0096] The computer 30 is installed in the vehicle 1, for example, in the dashboard or in the center armrest, or even in the roof of the vehicle 1.

[0097] As described above, the computer 30 includes a receiving module and a storage area. The receiving module is capable of receiving signals transmitted by the sensor 20 via a first communication link.

[0098] In addition, the computer 30 is connected to at least one signaling device, such as a horn, marker lights, low beam headlights, high beam headlights, etc.

[0099] Computer 30 is configured to detect the stationary position of the vehicle. In other words, computer 30 detects that vehicle 1 is parked and that vehicle 1 is not simply temporarily stopped. To this end, computer 30 detects when vehicle 1 stops and / or when the doors of vehicle 1 are locked by the driver, and then computer 30 detects when vehicle 1 stops and therefore when the stop is greater than the transition duration d. t It remains stationary for the duration of its duration.

[0100] In another embodiment, the computer 30 is configured to check whether the vehicle 1 is stationary based on the temperature outside the vehicle 1. For this purpose, the computer 30 is connected to an external temperature sensor pre-installed in the vehicle 1. The external temperature sensor is configured to measure the temperature outside the vehicle 1 and send at least one measured external temperature value to the computer 30.

[0101] Based on the received external temperature value, computer 30 is configured to determine the temperature inside the tire, since the temperature inside the tire is equal to the external temperature, and a predefined and known positive or negative compensation value is added to the external temperature. If the temperature value inside the tire is less than a predefined resting temperature, computer 30 is configured to confirm that vehicle 1 is in a stationary position.

[0102] Furthermore, the computer 30 is configured to receive presence signals s transmitted by at least one sensor 20 via their respective first wireless communication links. p For each received presence signal s p The computer 30 is configured to identify which sensor 20 has sent the presence signal s based on the identifier included in the presence signal. p .

[0103] For each received presence signal s p The computer 30 is also configured to measure the reference intensity P. RSSI_ref The value, especially by measuring the received presence signal s p The intensity, especially the RSSI intensity. Furthermore, the computer 30 is configured to record the measured reference intensity P in its storage area. RSSI_ref The value. Therefore, its sensor 20 has already sent an presence signal s.p Each wheel 10, computer 30 knows reference strength P RSSI_ref The value of .

[0104] Furthermore, for each received presence signal s p The computer 30 is also configured to record in its storage area the received presence signal s p The initial reference internal pressure P in ref_init The value and initial reference temperature T ref_init The value of .

[0105] Therefore, its sensor 20 has already sent an presence signal s p For each wheel, 10; the computer, 30, knows the initial reference internal pressure P. ref_init Values ​​of the initial reference temperature T ref_init Value and reference strength P RSSI_ref The value of .

[0106] The computer 30 is also configured to examine the initial reference internal pressure P recorded by each sensor 20. ref_init Values ​​of the initial reference temperature T ref_init Value and reference strength P RSSI_ref The cohérence of the value.

[0107] If the initial reference internal pressure P ref_init If the value is greater than the pre-defined minimum inflation threshold, then the initial reference internal pressure P ref_init The value is logical. This means the tire is fully inflated. The predefined minimum inflation threshold is recorded in the storage area of ​​computer 30.

[0108] If the initial reference temperature T ref_init If the value is less than the predetermined resting temperature, for example, equal to 40℃, then the initial reference temperature T ref_init The value is logical, and the value of the resting temperature is specifically recorded in the storage area of ​​computer 30.

[0109] Therefore, in this situation, the computer 30 checks the tire pressure without being affected by the high temperature.

[0110] If the reference strength P RSSI_ref If the value is greater than a predefined reference intensity threshold, then the reference intensity P RSSI_ref The value is logical. The reference strength threshold is, for example, pre-defined as -85dBm, and its value is recorded in the storage area of ​​computer 30.

[0111] Various embodiments of computer 30 will now be described, computer 30 being configured to detect that vehicle 1 has been lifted and / or wheels 10 have been detached from vehicle 1.

[0112] According to a first embodiment of the computer 30, the receiving module of the computer 30 is further configured to periodically receive lift detection signals transmitted by at least one sensor 20 via a first communication link. Furthermore, for each received lift detection signal, the computer 30 is configured to identify which wheel 10 the sensor 20 that transmitted the lift detection signal belongs to based on an identifier of the received lift detection signal.

[0113] Furthermore, based on the lift information contained in at least one received lift detection signal, computer 30 learns that a lift of vehicle 1 has been detected.

[0114] The computer 30 is also configured to measure the strength of each received lift detection signal.

[0115] Computer 30 is configured to, if the measured intensity value of the lift detection signal matches a predetermined reference intensity value P corresponding to the wheel 10 RSSI_ref If the absolute value of the difference between the two is greater than a predetermined intensity change threshold, then the wheel 10 that was detected by sensor 20 sending a lift detection signal will detach from vehicle 1.

[0116] The predetermined intensity change threshold is specifically equal to 30 dBm. The value of the intensity change threshold is specifically recorded in the storage area of ​​the computer 30.

[0117] According to another example, the computer 30 is configured to detect wheel 10 detachment if the measured intensity value is less than a predetermined intensity threshold. In other words, the computer 30 detects wheel 10 detachment when it detects a decrease in the intensity of a lift detection signal sent by a sensor contained in the wheel 10. In this case, the predetermined intensity threshold is specifically equal to -95 dBm. The value of the intensity threshold is specifically recorded in the storage area of ​​the computer 30.

[0118] According to a second embodiment of the computer 30, the computer 30 is configured to receive a lift detection signal sent by at least one sensor 20. The computer 30 is then configured to periodically (e.g., every 4 seconds) transmit a response signal to each sensor 20 that sent the lift detection signal via a second communication link. The computer 30 is then configured to receive a detachment detection signal sent by at least one sensor 20, indicating that the wheel 10 including the sensor 20 has detached from the vehicle 1, in other words, the wheel 10 has been stolen.

[0119] According to a third embodiment of the computer 30, the computer 30 is configured to receive a lift detection signal sent by at least one sensor 20.

[0120] The computer 30 is configured to periodically receive acceleration values ​​measured and transmitted by each sensor 20, which in particular has previously transmitted a lift detection signal.

[0121] The computer 30 is also configured to detect wheel detachment based on at least one measured acceleration value transmitted by the sensor 20 installed in the wheel 10. More specifically, the computer 30 detects wheel detachment if the absolute value of the measured acceleration change (in other words, the absolute value of the difference between two consecutively received measured acceleration values ​​by the computer 30) is greater than a predetermined acceleration change threshold (the predetermined acceleration change threshold is, for example, equal to 0.4g). The value of the acceleration change threshold is recorded in the storage area of ​​the computer 30.

[0122] According to another example, if the absolute value of the difference between at least one received measured acceleration value and a predetermined reference acceleration value is greater than a predetermined acceleration change threshold, then computer 30 detects that wheel 10 has detached.

[0123] The reference acceleration value is determined by sensor 20 and sent to computer 30.

[0124] A predetermined threshold for acceleration change is, for example, equal to 0.4g, and its value is recorded in the storage area of ​​computer 30.

[0125] In yet another example, computer 30 is configured to detect wheel 10 detachment if the absolute value of at least one measured acceleration value is greater than a predetermined acceleration threshold. In the present case, the predetermined acceleration threshold is equal to 1.5g.

[0126] According to a fourth embodiment of the computer 30, the computer 30 is configured to receive at least one detachment detection signal sent by at least one sensor 20, the detachment detection signal indicating that the wheel 10 to which the sensor 20 belongs has detached from the vehicle 1, in other words, the wheel 10 has been stolen.

[0127] If the computer 30 receives a detection signal indicating that at least one wheel 10 has been removed, or if the computer 30 itself detects that at least one wheel 10 has been removed, the computer 30 is configured to indicate that the wheel 10 has been stolen.

[0128] In particular, the computer 30 is configured to send a signal report near the vehicle 1, specifically by sending a signal to activate the vehicle lights and / or horn so as to activate the vehicle 1's lights and / or horn and scare away thieves in action.

[0129] Furthermore, computer 30 is also configured to remotely notify the owner and / or user of vehicle 1 that wheel 10 has been stolen, specifically by sending a notification signal. For example, the notification signal could be a message sent to the owner and / or user of vehicle 1's telephone, or even a voice message left on the owner and / or user of vehicle 1's unattended telephone.

[0130] Notification signals can also be sent to remote third parties, such as insurance companies or police.

[0131] refer to Figure 2 An embodiment of the method according to the present invention will now be described, which is implemented by the vehicle 1 described above.

[0132] For the sake of simplicity, the method will be described with respect to vehicle 1, for which a single wheel 10 includes a sensor 20.

[0133] If each wheel 10 includes a sensor 20, the method is repeated for each sensor 20.

[0134] The method first includes step E0, which detects the stationary position of vehicle 1. The stationary position of vehicle 1 corresponds to the fact that vehicle 1 is actually parked, and this stop is not a temporary stop of vehicle 1.

[0135] Therefore, during this step, computer 30 and sensor 20 check whether the stopping time of vehicle 1 is greater than a predetermined transition duration d. t .

[0136] Furthermore, when vehicle 1 is in motion, the temperature of each tire rises significantly. Therefore, in order to check whether vehicle 1 is stationary, sensor 20 and / or computer 30 check whether the tire temperature is below a predetermined resting temperature.

[0137] When sensor 20 has detected that vehicle 1 is stationary, sensor 20 measures the initial reference internal pressure P in the tire of wheel 10. ref_init The value of .

[0138] Similarly, sensor 20 measures the initial reference temperature T in the tire of wheel 10. ref_init The value of .

[0139] The method also includes the sensor 20 transmitting an presence signal s to the computer 30 via a first communication link. p Step E01. Signal s exists. p In particular, radio frequency signals, and especially including: identifiers; a determined initial reference internal pressure P ref_init The value of the initial reference temperature T; ref_init The value; and the information that the computer 30 sensor 20 has detected that the vehicle 1 is in a stationary position.

[0140] The method includes computer 30 receiving presence signal s p Step E02.

[0141] The method includes computer 30 checking the received presence signal s p Step E03, which involves checking the identifier, allows the computer 30 to determine which sensor 20 (and therefore from which wheel 10) is transmitting the presence signal. p This is especially true when multiple wheels 10 of vehicle 1 include sensors 20.

[0142] Therefore, the following steps of the method involve sending an presence signal s p The sensor 20, and therefore the wheel 10 including the sensor 20.

[0143] Furthermore, the method includes a computer 30 measuring the received presence signal s p The strength, especially the RSSI strength, is measured against the reference strength P. RSSI_ref Step E04.

[0144] Furthermore, the method includes recording the presence signal s in the storage area of ​​the computer 30. p Included initial reference internal pressure P ref_init and the initial reference temperature value T ref_init The value is determined in step E05. Initial reference internal pressure P ref_init The value and initial reference temperature T ref_init The value and including sending the presence signal s p The sensor 20 is related to the wheel 10 and the tire.

[0145] In addition, the recording step E05 also includes recording the reference intensity P measured by the computer 30 in the storage area of ​​the computer 30. RSSI_ref The reference strength is related to the presence signal s p It is related, and therefore related to the wheel 10 including sensor 20.

[0146] This method includes checking the initial reference internal pressure P. ref_init Initial reference temperature T ref_init and reference intensity P RSSI_ref The logical steps for determining the value are E06.

[0147] If the initial reference internal pressure P ref_init If the value is greater than the pre-defined minimum inflation threshold, then the initial reference internal pressure P ref_init The value is logical. If the initial reference temperature T... ref_initIf the value is less than the predetermined resting temperature (for example, the predetermined resting temperature is equal to 40℃), then the initial reference temperature T ref_init The value is logical. If the reference strength P... RSSI_ref If the value is greater than a predefined reference intensity threshold (e.g., -85 dBm), then the reference intensity P RSSI_ref The value is logical.

[0148] The method also includes step E001 where sensor 20 checks the tire inflation of wheel 10. For this purpose, sensor 20 measures the internal pressure P in the tire. 10 And check the measured internal pressure P 10 Is the value greater than the minimum inflation threshold?

[0149] The method includes step E1, which involves checking the stability of the temperature in the tire of the wheel 10 to which sensor 20 belongs.

[0150] During this step, sensor 20 checks the stability of the temperature inside the tire. To do this, sensor 20 measures the temperature value inside the tire. The temperature measured inside the tire is compared with the initial reference temperature T determined for the tire. ref_init When the absolute value of the difference between the two is less than a predetermined temperature threshold (the predetermined temperature threshold is, for example, equal to 3°C), the sensor 20 determines that the temperature is stable.

[0151] Sensor 20 can also determine a reference temperature value T by measuring the temperature inside the tire. ref For example, measure every 30 or 60 seconds. Reference temperature T ref Corresponding to the initial reference temperature T ref_init Update the value.

[0152] Similarly, when the reference temperature value T ref When a temperature reading has been taken, sensor 20 is configured to recheck temperature stability by measuring the temperature in the tire again. This is done when the temperature measured in the tire is compared with a reference temperature T determined for the tire. ref When the absolute value of the difference between the two is less than a predetermined temperature threshold, sensor 20 determines that the temperature is stable.

[0153] During the lift detection step E2, sensor 20 operates in monitoring mode and periodically measures (e.g., every 4 seconds) the internal pressure P of the tires of wheel 10. 10 If the measured internal pressure value P 10 and the predetermined initial reference internal pressure value P ref_init If the absolute value of the difference between the two is greater than a predetermined pressure difference threshold, then sensor 20 detects that vehicle 1 has been lifted.

[0154] In this way, sensor 20 detects the internal tire pressure P. 10 The decrease.

[0155] Sensor 20 also periodically measures the reference internal pressure value P. ref For example, measure the tire's internal pressure every 30 seconds or every 60 seconds. Refer to the internal pressure value P. ref Specifically corresponding to the initial reference internal pressure value P ref_init Update.

[0156] Similarly, when sensor 20 measures the internal reference pressure P ref When the new value is obtained, sensor 20 measures the internal pressure P again. 10 And if the measured internal pressure value P 10 and the predetermined internal reference pressure value P ref If the absolute value of the difference between the two is greater than a predetermined pressure difference threshold, then vehicle 1 is detected to have been lifted.

[0157] After detecting that vehicle 1 has been lifted, the method includes step E3 of activating the lifting mode of sensor 20, wherein the activation step is limited to a predetermined duration or when vehicle 1 is detected to be lifted.

[0158] According to a first embodiment of the method, the method is implemented by a first embodiment of sensor 20 and a first embodiment of computer 30. The first embodiment of the method includes step E3-10 whereby sensor 20 periodically transmits a lift detection signal to computer 30 via a first communication link.

[0159] The method includes the step of computer 30 periodically receiving lift detection signals sent by sensor 20.

[0160] For each lift detection signal received by computer 30, the method includes step E3-11 where computer 30 measures the intensity of the lift detection signal.

[0161] Following measurement step E3-11, the method may include step E3-12 whereby computer 30 detects wheel 10 detaching from vehicle 1. For example, when the measured strength value matches a predetermined reference strength P... RSSI_ref When the absolute value of the difference between the values ​​is greater than a predetermined intensity change threshold, the computer 30 detects that the wheel 10 has detached.

[0162] According to another example, if the measured intensity value is less than a predetermined intensity threshold, the computer 30 detects that the wheel 10 has detached.

[0163] According to a second embodiment of the method, the method is implemented by a second embodiment of sensor 20 and a second embodiment of computer 30. The second embodiment of the method includes step E3-20, whereby sensor 20 transmits at least one lift detection signal to computer 30 via a first communication link.

[0164] The method includes the step of computer 30 receiving a lift detection signal.

[0165] Upon receiving the lift detection signal, the method includes step E3-21 whereby the computer 30 periodically transmits a response signal to the sensor 20 via a second communication link.

[0166] The method includes the step of sensor 20 receiving each response signal. For each response signal received by sensor 20, the method includes the step E3-22 of sensor 20 measuring the intensity of the response signal.

[0167] The method includes steps E3-23 where sensor 20 detects wheel 10 detaching from vehicle 1. For example, when at least one measured strength value and a predetermined second reference strength value P... RSSI_ref2 When the absolute value of the difference between the two is greater than a predetermined second intensity change threshold, sensor 20 detects that wheel 10 has detached.

[0168] According to another example, if the measured intensity value is less than a predetermined second intensity threshold, the sensor 20 detects that the wheel 10 has detached.

[0169] After detecting wheel 10 detachment, the method includes the step of sensor 20 sending a detachment detection signal to computer 30. Computer 30 then receives the detachment detection signal sent by sensor 20.

[0170] According to a third embodiment of the method, the method is implemented by a third embodiment of sensor 20 and a third embodiment of computer 30. The third embodiment of the method includes the steps of sensor 20 sending a lift detection signal to computer 30, notifying computer 30 that a lift of vehicle 1 has been detected.

[0171] The method includes steps E3-30 where the sensor 20 periodically measures acceleration.

[0172] The method includes steps E3-31 whereby sensor 20 sends each measured acceleration value to computer 30. Therefore, the method also includes steps E3-32 whereby computer 30 receives each measured acceleration value.

[0173] The method includes steps E3-33 whereby a computer 30 detects wheel 10 detachment based on at least one received measured acceleration value.

[0174] Therefore, if the absolute value of the measured acceleration change is greater than a predetermined acceleration change threshold, the computer 30 detects that the wheel 10 has detached.

[0175] In another embodiment, if the absolute value of the difference between the received measured acceleration value and a predetermined reference acceleration value is greater than a predetermined acceleration change threshold, the computer 30 detects that the wheel 10 has detached.

[0176] According to yet another example, if the absolute value of at least one measured acceleration value is greater than a predetermined acceleration threshold, the computer 30 detects that the wheel 10 has detached.

[0177] Furthermore, the reference acceleration value is determined specifically by sensor 20. Sensor 20 then sends the determined reference acceleration value to computer 30.

[0178] According to a fourth embodiment of the method, the method is implemented by a fourth embodiment of sensor 20 and a fourth embodiment of computer 30. The fourth embodiment of the method may include the step of sensor 20 sending a lift detection signal to computer 30, notifying computer 30 that a lift of vehicle 1 has been detected.

[0179] The method includes steps E3-40 where the sensor 20 periodically measures acceleration.

[0180] The method includes step E4-41 whereby sensor 20 detects wheel 10 detachment based on at least one measured acceleration value. For this purpose, sensor 20 detects wheel 10 detachment if the absolute value of the measured acceleration change is greater than a predetermined acceleration change threshold.

[0181] According to another example, if the absolute value of the difference between the measured acceleration value and the predetermined reference acceleration value is greater than a predetermined acceleration change threshold, the sensor 20 detects that the wheel 10 has detached.

[0182] Furthermore, before step E4-41, which detects wheel 10 detachment, sensor 20 determines a reference acceleration value.

[0183] According to yet another example, if the absolute value of at least one measured acceleration value is greater than a predetermined acceleration threshold, sensor 20 detects that wheel 10 has detached.

[0184] After detecting wheel 10 detachment, the method includes the step of sensor 20 sending a detachment detection signal to computer 30. Therefore, computer 30 receives the detachment detection signal sent by sensor 20.

[0185] After detecting that wheel 10 has detached, the method includes step E4 of signaling a report that wheel 10, including sensor 20, has been stolen.

[0186] According to the first and third embodiments of the method, during step E4 of signaling the theft, the computer 30 issues a notification both near and remotely to the vehicle 1.

[0187] More specifically, near vehicle 1, computer 30 sends a signal to activate vehicle lights and / or horn, so as to activate the lights and / or horn of vehicle 1 and scare away thieves who are stealing wheel 10.

[0188] Computer 30 remotely notifies the owner or driver of vehicle 1, particularly via SMS sent to the owner's or driver's mobile phone, or via voice message left on an unattended telephone on the mobile phone. Furthermore, computer 30 can also notify the insurance company or law enforcement agency that insured vehicle 1.

[0189] According to the second and fourth embodiments of the method, after the computer 30 receives the detachment detection signal, the computer 30 issues a notification near the vehicle 1 and remotely, as described above.

[0190] Therefore, advantageously, the method implemented by the aforementioned computer 30 and at least one sensor 20 can detect the theft of the wheel 10 of the vehicle 1 and, where applicable, notify the owner or driver of the vehicle 1.

Claims

1. A method for signaling a theft of a wheel (10) of a motor vehicle (1), the vehicle (1) comprising: a plurality of wheels (10); and a computer (30), wherein at least one of the wheels (10) comprises a sensor (20), the method comprising, for said at least one wheel (10), the steps of: - measuring at least one internal pressure value (P 10 ) of a tyre of said wheel (10); - when the absolute value of the difference between at least one measured internal pressure value (P 10 ) and a predetermined reference internal pressure value (P ref , P ref_init ) is greater than a predetermined pressure difference threshold, it is detected that the vehicle (1) has been lifted; - detecting the disengagement of the wheel (10) when a lifting of the vehicle (1) is detected; - signalling the theft of the wheel (10) when the disengagement of the wheel (10) is detected; the method being characterized in that the step of detecting the disengagement of the wheel (10) comprises the steps of: - in a mode called "lifting" mode, as long as a lifting of the vehicle (1) is detected, the sensor (20) periodically transmits a lifting detection signal to the computer (30); - the computer (30) receives the transmitted lifting detection signal; - the strength of the received lifting detection signal is measured; - the computer (30) detects the disengagement of the wheel if at least one measured strength value is less than a predetermined strength threshold.

2. The method of claim 1, wherein, At least one transmitted lifting detection signal is a radio frequency type signal.

3. The method according to any of the preceding claims, wherein, The computer (30) is configured to send a notification signal to the user of the vehicle (1) in the event of theft of the wheel (10).

4. A computer program product, characterized in that, a set of program code instructions which, when executed by one or more processors, configure the one or more processors to implement the method according to any one of claims 1 to 3.

5. A motor vehicle (1), the vehicle (1) comprising: a plurality of wheels (10); and a computer (30), wherein at least one of the wheels (10) comprises a sensor (20), the computer (30) and the at least one sensor (20) being configured to implement the method according to any one of claims 1 to 3.

6. A sensor (20) for a motor vehicle, the vehicle (1) comprising: a plurality of wheels (10); and a computer (30), the sensor (20) being intended to be installed in a wheel (10) of the vehicle (1), the sensor (20) being configured to: - measuring at least one internal pressure value (P 10 ) of a tyre of said wheel (10); - if the absolute value of the difference between at least one measured internal pressure value (P 10 ) and a predetermined reference internal pressure value (P ref , P ref_init ) is greater than a predetermined pressure difference threshold, it is detected that the vehicle (1) has been lifted; - send a lifting detection signal to the computer (30); - periodically measure, in a lifting mode, an acceleration along an axis of rotation of the wheel (10); - detect the disengagement of the wheel (10) if the absolute value of the change in acceleration measured is greater than a predetermined acceleration change threshold.

7. Sensor (20) according to the preceding claim, configured to send a notification signal to the user of the vehicle (1) in the event of theft of the wheel.

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