Fail-Safe Device for Tire Pressure Monitoring Signal Verification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current tire pressure monitoring systems lack fail-safe mechanisms to reliably verify sensor signals, particularly in safety-critical applications, where failure detection and transition to a safe state are essential, especially during production and service operations.
Innovation Solution
A fail-safe device and method that utilizes a control module to verify sensor signals from one sensor based on physical relations with signals from another sensor, such as pressure and rotational speed or contact patch size, enabling detection of failures and generation of warning signals when correlations fall below thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor signals are used without verification in tire pressure monitoring systems, then the system operation is simple and fast, but the reliability and safety are insufficient for critical applications
Solution Approach 1:
The patent implements feedback by using a control module that continuously monitors sensor signals and compares them against expected physical relationships. When a discrepancy is detected, the system generates feedback signals to indicate potential failures, enabling continuous verification without requiring complex additional hardware.
Solution Approach 2:
The verification system uses the existing sensor signals themselves to check for consistency. The control module analyzes the physical relationships between signals from different sensors (pressure, temperature, acceleration) to self-verify system operation, eliminating the need for separate verification sensors or complex external monitoring equipment.
2Reliability
If multiple sensors with verification mechanisms are added to ensure safety, then the reliability improves, but the device complexity and cost increase
Solution Approach 1:
The control module serves multiple functions: it processes sensor data for normal tire pressure monitoring, performs verification by checking physical relationships between signals, and detects failures. This multi-functionality allows the system to achieve high reliability without adding separate dedicated verification components.
Solution Approach 2:
The patent uses physical relationships between different sensor signals as an intermediary verification mechanism. Instead of adding more sensors, the system checks whether the signals from existing sensors are consistent with known physical laws (e.g., relationships between pressure, temperature, and acceleration), providing verification through indirect comparison.
3Reliability
If sensor verification based on physical relations is implemented, then the safety and robustness improve, but the processing time and computational requirements increase
Solution Approach 1:
The verification system performs partial checks by focusing on key physical relationships that are most critical for safety. The control module selectively verifies signals based on their importance and the likelihood of failure, rather than performing exhaustive verification on all signals at all times, thus reducing processing time while maintaining safety.
Data Source
AI summary
Embodiments provide a fail-safe device, a tire pressure measurement system, a vehicle, a tire, a method and a computer program for monitoring a first sensor of a tire pressure monitoring system. The fail-safe device includes a first input for a first signal from the first sensor. The first signal indicates a first physical quantity. The fail-safe device includes a second input for a second signal from a second sensor. The second signal indicates a second physical quantity. The fail-safe device further includes a control module to verify the first signal based on the second signal and a physical relation between the first and the second physical quantities.