Wheel Position Identification via RSSI Rotational Tracking
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Solution Overview
Problem
Existing wheel assembly position identifying systems fail to accurately determine the positions of wheel assemblies due to signal attenuation by obstacles, leading to unreliable identification of maximum and minimum RSSI values.
Innovation Solution
A wheel assembly position identifying apparatus that includes transmitters with position detecting signals and a receiver that measures RSSI, utilizing rotational position detection and acceleration sensors to adjust transmission timing and power consumption, ensuring accurate identification by varying transmission times based on vehicle speed and obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the receiver identifies wheel assembly positions based on the magnitude relationship of RSSI differences, then the position identification method is simple, but the identification accuracy deteriorates when obstacles attenuate signals
Solution Approach 1:
The system transitions from static RSSI magnitude comparison to dynamic rotational position tracking. By continuously monitoring RSSI variations during wheel rotation and identifying extreme values at specific rotational positions, the system adapts to changing obstacle configurations while maintaining accurate position identification.
Solution Approach 2:
The system utilizes the periodic rotation of wheel assemblies to repeatedly measure RSSI at different orientations. By detecting extreme RSSI values during each rotation cycle and comparing rotational positions across multiple cycles, the system achieves reliable position identification despite signal attenuation from obstacles.
2Measurement precision
If the transmitter continuously transmits position detecting signals for predetermined transmission time, then the position identification accuracy is improved, but the power consumption increases
Solution Approach 1:
Instead of continuous transmission, the transmitter sends position detecting signals periodically during wheel rotation. The transmission occurs in predetermined time intervals sufficient to capture RSSI extreme values at different rotational positions, reducing overall power consumption while maintaining identification accuracy.
Solution Approach 2:
The system uses the natural rotation of the wheel assembly to automatically provide diverse transmission angles and orientations. This self-service mechanism eliminates the need for active control systems to adjust transmitter orientation, reducing power consumption while ensuring comprehensive signal coverage for accurate position identification.
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
The system effectively identifies wheel assembly positions with reduced power consumption and increased accuracy by accounting for obstacles and vehicle movement, maintaining consistent identification of rotational positions despite variations in RSSI due to environmental changes.
Implementation Method 1
transmitters transmit signals (radio waves)
Implementation Method 2
Signals transmitted from the transmitters are attenuated before reaching the reception antenna
Data Source
Figure 1A~1C
Figure 2~4
Figure 5~6B
AI summary
A wheel assembly position identifying apparatus is mounted in a vehicle equipped with rotational position detecting sections, each of which detects a rotational position of one of wheel assemblies. The apparatus includes transmitters, each of which is provided in one of the wheel assemblies, and a receiver, which is provided in a body of the vehicle. Each transmitter includes a transmission section, which is configured to transmit a position detecting signal to the receiver, and a control section, which is configured to cause the transmission section to continuously transmit the position detecting signal for at least a predetermined transmission time. The receiver includes a receiving section, which is configured to receive the position detecting signal, a measuring section, which is configured to measure a received signal strength indication (RSSI) of the received position detecting signal, and a wheel assembly position identifying section. The wheel assembly position identifying section is configured to detect, more than once, a rotational position of each wheel assembly at which the RSSI has an extreme value, for each position detecting signal received during one rotation of the wheel assembly, and identify the position of the wheel assembly in which the corresponding transmitter is provided based on variation of the rotational position of the wheel assembly at which the RSSI has the extreme value.