Wheel Position Detection Adjusting Variability for Road Conditions
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Solution Overview
Problem
Existing wheel position detection systems face accuracy issues on varying road surfaces, with higher accuracy on smooth roads but reduced accuracy on rough roads, leading to either incomplete detection on rough roads or prolonged detection times on smooth roads due to fixed allowable variability settings.
Innovation Solution
A wheel position detection apparatus that adjusts the allowable range of variability based on road surface conditions, using transmitters with acceleration sensors to detect gravitational acceleration and gear information to accurately identify wheel positions, with narrower ranges for smooth roads and wider ranges for rough roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed narrow allowable variability range is used for wheel position detection, then detection accuracy is improved on smooth roads, but detection cannot be completed on rough roads
Solution Approach 1:
The patent applies dynamics by making the allowable variability range adjustable rather than fixed. The control device dynamically changes the allowable variability range based on detected road surface conditions: using a first (narrower) range for smooth roads to ensure detection accuracy, and a second (wider) range for rough roads to ensure detection completion. This dynamic adaptation resolves the contradiction between precision and adaptability.
Solution Approach 2:
The patent changes the parameter of allowable variability range based on road surface conditions. By detecting road surface characteristics and adjusting the variability threshold accordingly, the system maintains high detection accuracy on smooth roads while ensuring reliable detection on rough roads, thus resolving the contradiction between measurement precision and adaptability.
2Adaptability or versatility
If a fixed wide allowable variability range is used for wheel position detection, then detection can be completed on rough roads, but detection time increases on smooth roads
Solution Approach 1:
The system dynamically adjusts the allowable variability range based on real-time road surface detection. On smooth roads, it uses a narrow first range that enables fast detection completion. On rough roads, it switches to a wide second range that ensures detection can be completed despite higher variability. This dynamic parameter adjustment resolves the contradiction between adaptability and detection time.
Solution Approach 2:
The patent changes the variability threshold parameter according to road surface conditions. By using a smaller allowable variability range for smooth roads and a larger range for rough roads, the system optimizes detection time for each condition, resolving the contradiction between versatility and time loss.
3Extent of automation
If acceleration detection signal is used for wheel position detection, then automatic wheel position specification is achieved, but detection accuracy varies with road surface condition
Solution Approach 1:
The patent uses feedback by detecting road surface conditions through acceleration signals and using this information to adjust the allowable variability range. The system monitors the acceleration detection signal, identifies road surface characteristics, and automatically adjusts the detection parameters accordingly. This feedback mechanism maintains automatic operation while compensating for accuracy variations caused by different road surfaces.
Solution Approach 2:
The system changes the allowable variability range parameter based on road surface conditions detected through acceleration signals. By automatically adjusting this parameter according to the detected road type (smooth or rough), the system maintains both automation and acceptable detection accuracy across varying conditions.
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 fast and accurate wheel position detection on smooth roads while ensuring adequate detection on rough roads by dynamically adjusting the allowable variability range, improving overall detection efficiency and accuracy across different road surfaces.
Implementation Method 1
a first controlling section that detects an angle of the transmitter in accordance with a gravitational acceleration component included in a detection signal of the acceleration sensor
Data Source
AI summary
In a wheel position detection apparatus, a first controlling section of a transmitter repeatedly transmits a frame including specific identification information at a timing when an angle of the transmitter is at a predetermined angle. A second control unit of a receiver receives the frame transmitted from the transmitter, and identifies which of a plurality of wheels the transmitter that has transmitted the frame is attached to. The receiver changes an allowable range of variability in accordance with a road surface condition indicated by a degree of road surface roughness every time the frame is received, and sets the allowable range of variability wider for a road surface that is rough than for a road surface that is not rough.