Tire Pressure Control Device Wheel Position Allocation
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Solution Overview
Problem
Existing tire pressure control systems face inefficiencies in quickly and automatically allocating tire pressure control devices to vehicle wheel positions after startup, leading to energy waste and prolonged allocation times, especially when not all devices show distinct angular offsets.
Innovation Solution
A method involving first sensors fixed to wheel positions and tire pressure control devices with secondary sensors that measure and filter rotation speed data, allowing for timely and energy-efficient allocation by comparing filtered data with central unit measurements, ensuring accurate and rapid allocation through adaptive time intervals and low-pass filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tire pressure control devices send multiple telegrams for allocation attempts, then allocation accuracy can be improved, but energy consumption increases and device lifespan decreases
Solution Approach 1:
The system performs preliminary actions by storing rotation speed measurements in a buffer before allocation decisions are made. This allows the central unit to have ready-access data for comparison when allocation telegrams arrive, reducing the need for repeated measurement cycles and thereby reducing energy consumption while maintaining allocation accuracy.
Solution Approach 2:
The patent implements periodic measurement cycles where rotation speed is measured at fixed time intervals and stored in a buffer. This periodic approach allows the system to efficiently manage energy consumption by only performing measurements when needed for allocation decisions, rather than continuously, while still providing sufficient data for accurate device-to-wheel position matching.
2Ease of operation
If tire pressure control devices send telegrams at fixed angular positions, then allocation can be performed, but time is wasted when angular offsets are not distinct
Solution Approach 1:
The central unit compares the rotation speed data from the buffer with the telegram data received from tire pressure control devices and provides feedback to determine correct wheel position assignments. This feedback mechanism allows the system to quickly identify correct allocations even when angular offsets are not distinct, reducing allocation time while maintaining ease of operation.
Solution Approach 2:
Rotation speed measurements are preliminarily stored in a buffer with time stamps before allocation decisions are made. This preliminary data preparation allows the central unit to efficiently compare multiple data points without waiting for additional measurement cycles, significantly reducing allocation time while keeping the process simple and automated.
3Measurement precision
If rotation speed measurements are taken continuously, then data accuracy for allocation is improved, but energy consumption and processing load increase
Solution Approach 1:
The system measures rotation speed periodically at fixed time intervals rather than continuously, storing these periodic measurements in a buffer. This approach maintains sufficient data accuracy for allocation decisions while significantly reducing energy consumption and processing load compared to continuous measurement, as the system only performs measurements when needed for allocation cycles.
Solution Approach 2:
Multiple rotation speed measurements are preliminarily captured and stored in a buffer before allocation decisions are required. This preliminary data collection allows the system to use historical data for comparison, maintaining high measurement precision for allocation while avoiding the energy waste of continuous real-time measurement during non-allocation periods.
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 method enables rapid and energy-efficient allocation of tire pressure control devices to wheel positions, reducing energy consumption and ensuring quick system readiness for safety, by using adaptive time intervals and low-pass filtering to improve data accuracy and synchronization.
Implementation Method 1
contains a second sensor for determining a measurand, from the chronological development of which the rotation speed of the respective wheel (revolutions of the wheel per unit of time) or the angular speed of the wheel can be derived
Implementation Method 2
in a first time interval Δt1 a following the detection the chronological development of the measurand detected during the rotation of the wheel about the predetermined rotation angle φ is subjected to a low pass filtering
Data Source
AI summary
Tire pressure control devices include first sensors to deliver repeatedly a measured value M1 for the rotation speed of the wheel. A measurand, from which the rotation speed of the associated wheel can be derived, is detected in a pointwise manner by means of a second sensor over a predetermined rotation angle φ of the wheel as a function of time, is subjected to a low pass filtering in a subsequent first time interval Δt1 and from the filtered development of the measurand a second measured value M2 is determined, which is a measurement for the rotation speed or respectively for the angular speed of the associated wheel. Each tire pressure control device transmits at the end of a second time interval Δt2 the second measured value M2 together with an identification of the tire pressure control device to a central unit. Comparing M1 and M2 determines wheel position.