Vehicle Rollover Safety Logic Using Lateral Acceleration Thresholds
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Solution Overview
Problem
Existing vehicle rollover detection systems face challenges in accurately detecting near rollover events without unnecessary deployment of protection devices, particularly due to mechanical vibrations and the need for additional sensors, which increases complexity and cost.
Innovation Solution
A safety logic for vehicle rollover detection systems that utilizes a main rollover detection logic and lateral acceleration sensors to generate activation signals based on predefined threshold values, with additional signals from the main logic at intermediate stages, ensuring protection device activation only when both logics confirm a dangerous situation, thereby reducing false activations and maintaining simplicity and low manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are added to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The safety logic uses the existing lateral acceleration sensor signals that are already processed by the main logic, making these signals serve dual purposes: both the main rollover detection and the safety logic confirmation, eliminating the need for additional dedicated sensors
Solution Approach 2:
The main logic's intermediate stage signals and processed sensor data are reused by the safety logic to generate its activation signal, allowing the existing system components to serve the additional safety function without requiring external additions
2Measurement precision
If additional sensors are added to improve detection accuracy, then measurement precision is improved, but manufacturing costs increase
Solution Approach 1:
The safety logic uses the existing lateral acceleration sensor signals that are already processed by the main logic, making these signals serve dual purposes: both the main rollover detection and the safety logic confirmation, eliminating the need for additional dedicated sensors
Solution Approach 2:
The main logic's intermediate stage signals and processed sensor data are reused by the safety logic to generate its activation signal, allowing the existing system components to serve the additional safety function without requiring external additions
3Device complexity
If the safety logic uses signals from the main logic, then device complexity is reduced, but reliability may be affected
Solution Approach 1:
The safety logic uses intermediate stage signals from the main logic that are generated before the final activation decision, allowing the safety logic to independently verify the detection process and provide an additional confirmation layer that enhances reliability
Solution Approach 2:
The safety logic receives feedback signals from the main logic's intermediate processing stages and uses these to independently confirm whether activation conditions are met, creating a feedback loop that improves system reliability without adding complexity
4Measurement precision
If the activation threshold is lowered to improve detection sensitivity, then measurement precision is improved, but false activations increase
Solution Approach 1:
The safety logic uses intermediate stage signals from the main logic that are generated before the final activation decision, allowing the safety logic to independently verify the detection process and provide an additional confirmation layer that enhances reliability
Solution Approach 2:
The safety logic receives feedback signals from the main logic's intermediate processing stages and uses these to independently confirm whether activation conditions are met, creating a feedback loop that improves system reliability without adding complexity
Data Source
AI summary
A safety logic for vehicle rollover detection systems comprising a main rollover detection logic and at least one protection device for the occupant or occupants of the vehicle, including a vehicle lateral acceleration sensor (11), which generates an output signal indicating a near rollover event, when a lateral acceleration of a vehicle exceeds the first predefined threshold value (15) or, when a lateral acceleration of vehicle exceeds the second predefined threshold value (16) that is lower than the first predefined threshold value (15) and simultaneously at least one additional safety logic activation signal is present (1, 1′, 1″, 1′″).