Tire Pressure Monitoring System Initialization via Acceleration Force Comparison
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Solution Overview
Problem
Conventional direct tire pressure monitoring systems require lengthy initialization processes to accurately assign tire pressure values to wheel positions, especially after a stationary period, leading to inefficiencies and delays in evaluating tire pressure values upon vehicle restart.
Innovation Solution
A method that detects a stationary state using centrifugal force or vehicle speed measurements, stores and compares acceleration forces at each wheel to determine if a change has occurred, allowing for immediate initialization and accurate assignment of tire pressure values upon restart, thereby skipping unnecessary location determining processes if no changes are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a location determining process is carried out after vehicle restart to ensure accurate wheel position assignment, then measurement precision of wheel position is improved, but loss of time occurs due to the lengthy initialization process
Solution Approach 1:
The system performs preliminary actions by storing acceleration force data during stationary periods before vehicle operation. This allows the system to have location determination data ready in advance, eliminating the need for lengthy initialization processes after vehicle restart while maintaining accurate wheel position assignment.
Solution Approach 2:
The system dynamically adapts the location determining process based on detected changes. Instead of always performing a complete initialization, the system only re-determines locations when acceleration force changes indicate wheel or tire changes, optimizing the balance between precision and time loss.
2Reliability
If the location determining process is performed frequently to account for potential wheel or tire changes during stationary periods, then reliability of wheel position assignment is improved, but productivity of the system deteriorates due to repeated initialization
Solution Approach 1:
The system uses feedback from acceleration force sensors to detect whether wheel or tire changes have occurred during stationary periods. This feedback mechanism allows the system to perform location determination only when necessary, maintaining reliability while avoiding unnecessary repeated initializations that would reduce productivity.
Solution Approach 2:
The system dynamically adjusts the frequency of location determining processes based on detected changes. Instead of fixed frequent initialization, the system performs location determination adaptively - only when acceleration force changes indicate potential wheel or tire changes - thereby maintaining reliability without sacrificing productivity.
3Measurement precision
If acceleration sensors are used to detect wheel position changes during stationary state, then measurement precision of wheel position is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The system achieves multi-functionality by using acceleration force sensors for multiple purposes: detecting wheel position changes during stationary periods, monitoring tire pressure, and providing data for location determination. This approach improves measurement precision without proportionally increasing device complexity, as existing sensors serve multiple functions.
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 approach significantly reduces the time required for tire pressure monitoring system initialization, allowing for immediate evaluation and assignment of tire pressure values, enhancing efficiency and safety by minimizing delays in detecting faulty tire pressures.
Implementation Method 1
an acceleration sensor is used in the tire which can differentiate, given a constant vehicle speed, between the left/right wheel positions and the front/rear wheel positions. In this context, the acceleration sensor senses, on the basis of its installation position, the acceleration in the circumferential direction of the wheel.
Data Source
AI summary
A method of operating a tire pressure monitoring system for a motor vehicle includes detection of a stationary state of the motor vehicle by way of a centrifugal force measured on the wheel side or a vehicle speed measured on the vehicle side, during a time period during which the vehicle speed is zero; detection and vehicle-side storage of an acceleration force in each wheel during the time period, and renewed detection of an acceleration force in each wheel at the end of the time period. The detected acceleration force in each wheel is transmitted to a vehicle-side control device and compared with earlier-stored acceleration forces associated with the respective wheel position. The tire pressure system is initialized following the stationary state of the motor vehicle in the event of a deviation in any of the wheels. There is also provided a tire pressure monitoring system and a motor vehicle.