Method and unit for the optimized transmission of measurement of parameters of vehicle tyres
First Claim
1. A method of optimized transmission of finalized data (DF) to a central unit of parameters of tires of a vehicle, said data being obtained on the basis of raw data (DB) of parameters measured by sensors (14, 16, 17) of the wheel units (10) of a system for monitoring the pressure of the tires by way of a radiofrequency circuit (20), said wheel units (10) each comprising:
- a processor (15), located in a processing module (12), for calculating the finalized data (DF) on the basis of the raw data (DB)a memory (18) so as to store the raw data (D′
B) and the finalized data (D′
F),a clock (19) of the processor (15), linked to the processor (15), possessing a time base (CLKB) for managing the frequency of the measurements of the raw data (DB),a clock (26) of the emission circuit (20) possessing a time base (Tps) and managing the frequency of emission by an emission circuit (20) of the finalized data (DF) to the central unit,said method being characterized in that it comprises the following steps;
step 1, verification in each wheel unit (10), by comparison means (13), situated in the processing module (12) and linked to the processor (15) and to the sensors (14, 16, 17), that the difference between a new raw datum (DB) of at least one reference parameter, provided at a given instant, and a raw datum (D′
B) of this same parameter, provided at an earlier instant and stored in the memory (18), is greater, in absolute value, than a predetermined threshold of variation (S),step 2, if the threshold of variation is crossed, calculation by the processor (15) of the finalized data (DF) of the parameters on the basis of the raw data (DB),step 3, storage in the memory (18) of the new raw data (D′
B) and of the corresponding new finalized data (D′
F),step 4, transmission of the finalized data (DF) to the central unit by way of the emission circuit (20).
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Abstract
In a system for monitoring the pressure of the tires of a vehicle, it is proposed to compensate the raw data of the parameters of the tires only if the comparison of the successive raw data of at least one reference parameter exhibits a deviation, in absolute value, greater than a determined threshold of variation. In a TPMS monitoring system, each wheel unit includes sensors for measuring the parameters of pressure, temperature and acceleration, and elements of storage and autonomous power supply, in conjunction with a processor. The raw data provided by the sensors are stored, compensated and transmitted as finalized data by a radiofrequency emission circuit to a central unit. It is proposed that the wheel unit also includes, in a processing module, comparison elements, external to the processor, for comparing between successive raw data of one and the same parameter that are provided by the measurement sensors.
25 Citations
20 Claims
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1. A method of optimized transmission of finalized data (DF) to a central unit of parameters of tires of a vehicle, said data being obtained on the basis of raw data (DB) of parameters measured by sensors (14, 16, 17) of the wheel units (10) of a system for monitoring the pressure of the tires by way of a radiofrequency circuit (20), said wheel units (10) each comprising:
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a processor (15), located in a processing module (12), for calculating the finalized data (DF) on the basis of the raw data (DB) a memory (18) so as to store the raw data (D′
B) and the finalized data (D′
F),a clock (19) of the processor (15), linked to the processor (15), possessing a time base (CLKB) for managing the frequency of the measurements of the raw data (DB), a clock (26) of the emission circuit (20) possessing a time base (Tps) and managing the frequency of emission by an emission circuit (20) of the finalized data (DF) to the central unit, said method being characterized in that it comprises the following steps; step 1, verification in each wheel unit (10), by comparison means (13), situated in the processing module (12) and linked to the processor (15) and to the sensors (14, 16, 17), that the difference between a new raw datum (DB) of at least one reference parameter, provided at a given instant, and a raw datum (D′
B) of this same parameter, provided at an earlier instant and stored in the memory (18), is greater, in absolute value, than a predetermined threshold of variation (S),step 2, if the threshold of variation is crossed, calculation by the processor (15) of the finalized data (DF) of the parameters on the basis of the raw data (DB), step 3, storage in the memory (18) of the new raw data (D′
B) and of the corresponding new finalized data (D′
F),step 4, transmission of the finalized data (DF) to the central unit by way of the emission circuit (20). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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- Resources
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Current AssigneeContinental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
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Original AssigneeContinental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
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InventorsVassilieff, Youri
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Primary Examiner(s)Lau, Hoi
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Application NumberUS13/581,558Publication NumberTime in Patent Office1,169 DaysField of Search340/445, 340/448, 340/449, 340/539.1, 340/539.19, 340/446, 116/34.R, 731/46, 731/463, 731/464, 731/465, 731/468US Class Current340/447CPC Class CodesB60C 23/0408 transmitting the signals by...
