Wireless Tire Sensor Collision Avoidance via Dynamic Wake-Up
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Solution Overview
Problem
Conventional wireless tire pressure monitoring systems experience data collisions due to overlapping data transmission cycles from multiple tire condition sensors, which can be mitigated by increasing transmission frequency but results in higher power consumption, complicating the system and increasing costs.
Innovation Solution
Each wireless tire condition sensor employs a unique ID to dynamically select a wake-up time or time gap for data transmission, computed using a first variable, to avoid data collisions at the receiving end, thereby reducing power consumption and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data transmission frequency of each wireless tire condition sensor is increased to reduce data collision, then the reliability of data transmission is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the wake-up time of each sensor dynamic rather than fixed. Each sensor calculates its wake-up time based on its ID and a variable parameter that changes over time, allowing the transmission schedule to adapt and avoid collisions without requiring all sensors to transmit at maximum frequency, thus reducing overall power consumption while maintaining reliability
Solution Approach 2:
The patent changes the parameter of wake-up time for each sensor based on its ID and a variable counter. By modifying the wake-up time parameter dynamically, the system ensures that sensors with different IDs transmit at different times, avoiding collisions without increasing transmission frequency, thereby maintaining reliability while minimizing power consumption
2Ease of operation
If the data transmission cycle of each wireless tire condition sensor is fixed, then the ease of operation is improved, but data collision occurs due to overlapping transmission cycles
Solution Approach 1:
The patent segments the transmission time slots by assigning different wake-up times to different sensors based on their unique IDs. This segmentation divides the transmission cycle into distinct time slots for each sensor, preventing overlap and collisions while maintaining the simplicity of fixed cycles for each individual sensor
Solution Approach 2:
The patent performs preliminary action by pre-calculating and assigning different wake-up times to each sensor based on its ID before the transmission cycle begins. This preliminary differentiation of transmission times prevents collisions from occurring in the first place, maintaining both operational simplicity and transmission reliability
Data Source
AI summary
A collision avoidance method for transmitting data from multiple wireless tire condition sensors on a vehicle is executed by each wireless tire condition sensor having a unique ID and multiple different wake-up times. After the sensor is operated to sense data, the method has steps of reading the ID and computing a determination value with the ID and a variable, selecting one of the wake-up times according to the determination result, and after the selected wake-up time expires, transmitting the sensed data. As the selected wake-up times of the sensors differ from one another, data collision at the receiving end arising from data transmission from the sensors can be avoided. Additionally, besides the wake-up time, a time gap between data transmitted twice consecutively from each sensor can be employed to achieve data collision avoidance.