Vehicle Wheel Positioning via Antenna Signal Scrambling
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Solution Overview
Problem
Current wheel location methods in vehicle monitoring systems are unreliable due to the need for precise antenna adjustments and high sensitivity settings, leading to noise immunity and sensitivity tolerance issues, especially when using hands-free access device antennas for wheel localization.
Innovation Solution
The method involves positioning transmit antennas in proximity to pairs of wheels and programming the central unit to send identification request signals while simultaneously transmitting garbled signals to other antennas, allowing only the closest wheels to respond with their identifying codes, thus eliminating the need for sensitive adjustments and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hands-free access device antennas are used for wheel localization, then device complexity is reduced, but reliability deteriorates due to noise immunity and sensitivity tolerance issues
Solution Approach 1:
The patent divides the wheel localization process into sequential time slots, where each antenna activates in turn rather than simultaneously. This temporal segmentation allows the system to use existing hands-free antennas without requiring precise simultaneous coordination, reducing complexity while maintaining reliability through ordered signal transmission and reception.
Solution Approach 2:
The patent implements periodic activation of each antenna in a cyclic sequence, with each antenna transmitting identification requests at specific time intervals. This periodic action allows the system to reuse the same physical antennas for different functions (hands-free operation and wheel localization) without interference, resolving the contradiction between using existing antennas and maintaining localization reliability.
2Device complexity
If transmission power is lowered to achieve selective locating, then device complexity is reduced, but reliability worsens due to working at the limit of receiver sensitivity
Solution Approach 1:
The patent assigns specific time slots to each antenna before the localization process begins, establishing a predetermined activation sequence. This preliminary arrangement eliminates the need for complex real-time power adjustments and antenna coordination, allowing the system to achieve selective locating through temporal ordering rather than power control, thus maintaining reliability without complex adjustments.
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
This approach provides a more reliable and reactive wheel location method that can be implemented with simple software adaptations to existing hands-free access devices, reducing noise immunity and sensitivity issues, and allowing for accurate wheel positioning without compromising reliability.
Implementation Method 1
a sensor mounted on each of the wheels of the vehicle and comprising a microprocessor and a radiofrequency transmitter (or RF transmitter)... with a central unit for receiving the signals transmitted by the transmitters, comprising a computer integrating a radiofrequency receiver (or RF receiver) connected to an antenna
Data Source
AI summary
The invention relates to a method and a device for locating the position of wheels (2-5) of a vehicle (1). According to the invention, the vehicle (1) is equipped with transmit antennas (11-14) each disposed in such a way as to be positioned in proximity to a wheel (2-5) or to a pair of wheels (2-4, 3-5, 2-3, 4-5), and a locating procedure is implemented according to which, successively for each of the transmit antennas (11-14), the transmission, by said transmit antenna, of an identification request signal is instructed, and simultaneously with the transmission of said identification request signal, the transmission, by each of the antennas positioned in proximity to the other wheels, of a garbled signal designed to scramble the identification request signal is instructed.