Pneumatic Ride-Height Control with Time-Threshold Hazard Analysis
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Solution Overview
Problem
Current pneumatic level control systems in vehicles lack a computer-implemented procedure for constant hazard analysis and risk assessment according to ISO 26262, which is essential for ensuring safety integrity levels and automatically implementing countermeasures to prevent chassis height deviations.
Innovation Solution
A computer-implemented method for monitoring and controlling pneumatic level control systems that repeatedly measures chassis height and time intervals, triggering countermeasures such as electronic stability programs and speed adjustments when thresholds are exceeded, and deactivating measures when the chassis returns to safe levels, while also considering driving dynamics and external factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic level control systems are used to maintain chassis height, then the chassis height can be controlled within a desired range, but the system lacks continuous hazard analysis and risk assessment capability according to ISO 26262 standards
Solution Approach 1:
The patent implements continuous feedback by repeatedly measuring the current chassis level and comparing it against threshold values and time interval thresholds. The control device receives level information from level information sources and continuously monitors whether the chassis level exceeds thresholds for durations exceeding time intervals, enabling real-time hazard detection and risk assessment
Solution Approach 2:
The control device automatically triggers predefined technical measures when hazards are detected, without requiring external intervention. The system self-manages the hazard analysis and risk assessment process by automatically comparing measurements against thresholds, determining when time intervals are exceeded, and initiating appropriate countermeasures such as activating stability programs or adjusting vehicle speed
2Measurement precision
If threshold-based control is implemented to maintain chassis height, then height control is achieved, but the system cannot distinguish between temporary fluctuations and sustained hazardous conditions
Solution Approach 1:
The patent establishes predefined threshold values and time interval thresholds in advance before operation. These thresholds are predetermined based on safety requirements and chassis characteristics, allowing the system to immediately compare real-time measurements against established criteria and trigger appropriate responses without delay
Solution Approach 2:
The system dynamically adapts its monitoring by repeatedly measuring chassis level and continuously evaluating whether time intervals between threshold exceedances are exceeded. This dynamic evaluation allows the system to distinguish between temporary fluctuations (where time intervals are not exceeded) and sustained hazardous conditions (where time intervals are exceeded), enabling precise response timing
3Reliability
If automatic countermeasures are triggered when thresholds are exceeded, then safety risks are reduced, but false alarms may occur due to temporary level fluctuations
Solution Approach 1:
The patent introduces time interval thresholds as a buffer mechanism before triggering countermeasures. When the chassis level exceeds a threshold, the system does not immediately trigger countermeasures unless the exceedance persists for a duration exceeding the predefined time interval threshold. This cushioning mechanism filters out temporary fluctuations and prevents false alarms while maintaining rapid response to sustained hazardous conditions
Data Source
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Figure 1b
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AI summary
The invention relates to a computer-implemented method for monitoring and controlling a pneumatic ride-height control system of a chassis system, the method comprising the following steps: repeatedly measuring a current height (129) of a chassis system; detecting when the current height (129) of the chassis system exceeds at least one predefined height threshold value (267), wherein a time interval threshold value (270) is associated with the height threshold value (267); repeatedly measuring a time interval in which the current height (129) of the chassis system exceeds the at least one predefined height threshold value (267); detecting when the measured time interval exceeds the predefined time interval threshold value (270) associated with the at least one predefined height threshold value (267); repeatedly checking whether both the at least one height threshold value (267) and the associated time interval threshold value (270) have been exceeded, and if this is the case, automatically triggering predefined technical measures (263, 264, 265), which are at least suited to prevent the current height (129) of the chassis system from rising further and/or to increase a stability of the chassis system (152, 153); deactivating (266) the automatically triggered measures (263, 264, 265) when the repeated check shows that the current height (129) of the chassis system is below the at least one height threshold value (267) and the associated time interval threshold value.