Wheel Position Detection via Dynamic Transmission Angle Adjustment
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Solution Overview
Problem
Existing wheel position detecting devices in tire pressure monitoring systems face difficulties in accurately and efficiently specifying the position of wheels, especially when the radio signal is difficult to reach the receiver, leading to prolonged detection times or failure in detecting the wheel position.
Innovation Solution
A wheel position detecting device that integrates a transmitter with an acceleration sensor and a wheel speed sensor, where the transmitter changes its transmission angular position by a predetermined angle each time it transmits a frame, ensuring proper reception by the receiver, and uses gear information to specify the wheel position through variation allowance ranges and tooth position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio signal is transmitted when the wheel is at the predetermined rotational position, then the wheel position can be detected, but the detection fails or takes excessive time when the transmission position coincides with the Null position where radio signal reception is difficult
Solution Approach 1:
The transmitter dynamically changes its transmission angular position by a predetermined angle each time it transmits a frame, rather than transmitting at a fixed rotational position. This dynamic adjustment ensures that the transmission does not consistently occur at the Null position, thereby maintaining reliable detection while avoiding the time loss associated with repeated failed transmissions at the same problematic angle.
Solution Approach 2:
The transmission angular position parameter is changed by a predetermined angle with each transmission. This parameter change transforms the static transmission approach into a variable one, ensuring diverse transmission angles that avoid consistent interference from the Null position, thus improving both reliability and reducing detection time.
2Device complexity
If the transmitter transmits at a fixed angular position, then the transmission process is simple, but the detection accuracy deteriorates when signal reception is difficult at that position
Solution Approach 1:
The system transitions from a static fixed-angle transmission to a dynamic variable-angle transmission. The transmitter adjusts its angular position dynamically, which adds some control complexity but significantly improves detection accuracy by ensuring signals are not consistently transmitted from problematic Null positions.
Solution Approach 2:
The transmitter preliminarily determines the transmission angular position by adding a predetermined angle to the previous transmission angle before actually transmitting. This preliminary adjustment ensures that the transmission occurs from an optimized angle that avoids known problematic positions, thereby improving detection accuracy while maintaining manageable system complexity.
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 smooth and accurate wheel position detection, even in challenging signal reception conditions, by adjusting the transmission angular position and using gear information to correctly identify the wheel, thereby improving the efficiency and reliability of the detection process.
Implementation Method 1
an acceleration sensor that outputs a detection signal according to an acceleration containing a gravitational acceleration component that varies with rotation of the corresponding wheel
Implementation Method 2
The transmitter includes an antenna and a first control unit. The first control unit generates and transmits a frame that includes an identification information specific to the transmitter
Data Source
AI summary
In a wheel position detecting device, a transmission angular position of a transmitter to transmit a frame from the transmitter to a receiver is changed by a predetermined angle each time the transmitter transmits the frame. A receiver acquires gear information indicating a tooth position of a gear rotating in association with a corresponding wheel, based on a detection signal of a wheel speed sensor. The receiver specifies to which wheels the transmitter is integrated, based on the tooth position of the gear at a reception timing of the frame.