Method of early warning for vehicle

1. A pre-alert determination method for a vehicle intended to make a planned journey, in which the vehicle includes a data processor with a test module and a pressure measuring system for obtaining pressure data relating to a pressure of a tyre and supplying the pressure data to the data processor, wherein the data processor detects a pressure-state pre-alert condition based on a set of criteria, the method comprising:

supplying journey data relating to a planned journey to the data processor;

processing, by the data processor, a test based on the set of criteria, the pressure data, and the journey data;

detecting, by the data processor, from a result of the test, whether a pressure-state pre-alert condition exists; and,

if a pre-alert condition is detected to exist, transmitting a corresponding signal.

2. A pre-alert determination method according to claim 1 ,

wherein the pressure data includes at least one of: a pressure value recommended for tyres of the vehicle, data relating to whether there is a leak in a tyre of the vehicle, and, if there is a leaking tyre, a value for a rate of pressure loss in the leaking tyre and a pressure value in the leaking tyre measured at a given instant,

wherein the journey data includes at least one of: a travel distance of the planned journey, and a travel duration of the planned journey, and

wherein the pre-alert condition is detected to exist if there is a leak in a tyre of the vehicle and if at least one of the travel distance and the travel duration is sufficient for the pressure value of the leaking tyre to reach, during the planned journey, a value less than a recommended minimum pressure threshold.

3. A pre-alert determination method according to claim 1 ,

wherein the pressure data includes data relating to whether there is a leak in a tyre of the vehicle,

wherein the journey data includes a value of a speed of a fastest section of the planned journey, and

wherein the pre-alert condition is detected to exist if there is a leak in a tyre of the vehicle and if the planned journey includes the vehicle travelling on a road with a traffic speed above a threshold speed.

4. A pre-alert determination method according to claim 1 ,

wherein the pressure data includes a pressure value of a tyre of the vehicle measured at a given instant, and multiple recommended pressure values for tyres of the vehicle, the multiple recommended pressure values respectively corresponding to multiple speeds of the vehicle,

wherein the journey data includes a value of a speed of a fastest section of the planned journey, and

wherein the pre-alert condition is detected to exist if the planned journey includes a portion in which a recommended pressure value is higher than a value measured for a tyre of the vehicle.

5. A pre-alert determination method according to claim 4 , wherein the pre-alert condition is found if the planned journey includes a portion for which the recommended pressure value is higher than the value measured for the tyre by at least one given transition value.

6. A pre-alert determination method according to claim 1 ,

wherein the pressure data includes a difference value, at a given instant, between pressure values of two tyres on a same axle of the vehicle, and a given maximum difference value (EM),

wherein the journey data includes a value of a speed of a fastest section of the planned journey, and

wherein the pre-alert condition is detected to exist if the difference is greater than the given maximum difference value (EM), and if the planned journey includes a portion on a road with a traffic speed above a threshold speed.

7. A pre-alert determination method according to claim 1 ,

wherein the method utilizes a mobile device mounted on the vehicle, the mobile device including a microprocessor, and

wherein the mobile device receives the pressure data and performs a pre-alert test based on the planned journey.

8. A pre-alert determination method according to claim 1 ,

wherein the method utilizes a computation device located outside the vehicle, the computation device including a microprocessor, and

wherein the computation device receives the pressure data and performs a pre-alert test based on the planned journey.

9. A pre-alert determination method according to claim 1 , wherein the method is used in a digital road network system stored on a memory medium, the system including information on a plurality of elements and information on positions of the elements, the elements being able to be arranged in a reconstruction of a road network so as to form portions of a road and crossroads, and the elements being usable by the data processor to link a departure point D and an arrival point A for the planned journey.