Tyre Sensor Identification via Variable Antenna Power
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Solution Overview
Problem
In vehicles with twin wheels, existing sensor systems face difficulties in differentiating and locating sensor emissions due to their proximity, leading to complex and expensive coding techniques, and electromagnetic interference that blinds the receiver during vehicle operation.
Innovation Solution
A method and device that vary the power of the transmission antenna to include or exclude sensors within its range, allowing for identification without coding, by adjusting the antenna's power to selectively activate and receive signals from inner and outer wheel sensors, using a variable resistor to change the antenna's gain and radiation field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex coding and identification techniques are implemented to differentiate sensor emissions, then sensor differentiation capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the power parameter of the transmission antenna to differentiate between sensors. By varying the antenna power, the system creates distinct transmission fields that allow the receiving module to identify which sensor is transmitting based on which sensors are included or excluded from the transmission field radius at each power level.
2Reliability
If high power transmission is used to ensure all sensors are detected, then detection coverage is improved, but electromagnetic interference increases causing receiver blindness
Solution Approach 1:
The patent applies dynamics by making the transmission antenna power variable rather than fixed. The system progressively varies the antenna power during the identification process, adjusting the transmission field radius dynamically to include or exclude specific sensors, thereby avoiding constant high-power transmission and reducing electromagnetic interference.
3Length of stationary object
If antenna power is increased to interrogate distant sensors, then sensor interrogation range is improved, but nearby sensors cannot be excluded leading to identification failure
Solution Approach 1:
The patent uses periodic action by progressively varying the antenna power in steps during the identification process. The system interrogates sensors at different power levels in a sequence, allowing it to determine which sensor is active by observing which sensors are included or excluded from the transmission field at each power level, thereby achieving precise identification while maintaining interrogation range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective and simple identification of sensors in twin wheel configurations without modifying existing communication technologies, ensuring accurate data reception and differentiation between sensors, even during vehicle operation.
Implementation Method 1
the electromagnetic radiation emitted by the sensors and received by the reception module
Implementation Method 2
each sensor placed in each tire is conventionally equipped with a radiofrequency transmitter for the purpose of wireless transmission of said data
Data Source
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AI summary
The invention relates to a method of identifying sensors (Cl, C2, C3, C4) of an information system for a vehicle (Vl) of the type that links a plurality of sensors housed in the wheels and equipped with a subassembly for transmitting the collected data to a module (100) for transmitting and receiving said collected data, which is equipped with at least one transmission/reception antenna (110), in which each axle end is fitted with twin wheels, an inner wheel and an outer wheel, each wheel accommodating an equipped sensor (Ci or Ce) of a transmission subassembly, said method being noteworthy in that it consists in varying the power of the transmission antenna (110) in such a way that the transmission field of the antenna varies and includes or excludes the sensor(s) (Ci, Ce) located within its radius of action. The invention also relates to the device for implementing the method described above. Applications: detection and transmission of parameters from vehicle tyres.