Vehicle Safety Agent Sensor Signal Simulation
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Solution Overview
Problem
Existing vehicle safety systems lack a reliable method to safely check the initiation of protective functions, such as airbag deployment, without risking unintentional activation, especially in scenarios involving sensor data errors or malfunctions.
Innovation Solution
A device comprising a microcomputer, microelectronic circuit with data bus interfaces, sensor bus interface, and a safety unit that simulates sensor signals to monitor and check sensor data for errors, ensuring the safe initiation of protective functions by integrating a sensor signal simulation unit within the microelectronic circuit, allowing for continuous monitoring and error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If sensor data is directly used to initiate protective functions, then the system responds quickly to real threats, but the system becomes vulnerable to unintentional activation from sensor errors
Solution Approach 1:
A safety unit is introduced as an intermediary component between the sensor interface and the initiating components. This safety unit independently verifies sensor data and ignition circuit status before allowing activation, preventing direct coupling between sensor inputs and protective function initiation while maintaining system response speed
Solution Approach 2:
The safety unit performs preliminary checks of sensor data plausibility and ignition circuit status before the actual activation sequence. By verifying conditions in advance and maintaining readiness states, the system can quickly respond to genuine threats without compromising activation reliability
2Reliability
If multiple initiating components are required for activation, then the system achieves higher safety through redundancy, but the device complexity increases
Solution Approach 1:
The safety unit combines multiple checking functions (sensor data verification, ignition circuit status monitoring, activation authorization) into a single integrated component. This merging approach achieves the safety of multiple initiating components while reducing overall device complexity by consolidating control logic
Solution Approach 2:
The control system is segmented into distinct functional modules: sensor interface, safety unit with checking unit, and initiating components. This segmentation allows independent verification at each stage while maintaining a clear separation of concerns, achieving high safety without excessive complexity
3Reliability
If the system continuously monitors sensor data for errors, then the reliability of protective function initiation is improved, but the energy consumption increases
Solution Approach 1:
The checking unit performs periodic monitoring of sensor data plausibility and ignition circuit status rather than continuous monitoring. This periodic checking approach maintains reliable detection of errors and unauthorized activation attempts while significantly reducing energy consumption compared to continuous monitoring
Data Source
AI summary
A safety-related device for use in vehicles, includes a microcomputer, a micro-electronic circuit, a first data bus interface, a second data bus interface, a safety unit (Safety-Agent), a PSI5 sensor link, and a sensor signal simulation unit which can simulate a sensor. The safety unit (Safety-Agent) is controlled via the first data interface by the microcomputer. The sensor signal simulation unit and the sensor interface and the switching between same via the second data interface is controlled via the microcomputer.