Vehicle Driving Assistance Plausibility Checks Between Control Units
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Solution Overview
Problem
Automated driving systems face challenges in ensuring high safety integrity due to reliance on subordinate controllers providing potentially incorrect values, which can lead to hazardous situations.
Innovation Solution
A driving assistance system with a first control unit checking the plausibility of information from a second control unit using its own sensor data, enabling emergency stops or warnings if the information is not plausible, thereby enhancing safety integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the subordinate controller is trusted to return correct values without verification, then the device complexity is reduced, but the reliability deteriorates due to potential incorrect values leading to hazardous situations
Solution Approach 1:
The superordinate controller receives feedback information from the subordinate controller about the performed action and independently verifies this information against sensor data. This feedback mechanism allows the system to maintain trust in the subordinate controller while adding a verification layer that improves reliability without requiring complete system redesign.
Solution Approach 2:
The superordinate controller acts as an intermediary that mediates between the subordinate controller's outputs and the final driving actions. It verifies the plausibility of information from the subordinate controller before acting on it, thereby improving safety integrity while maintaining the subordinate controller's operational independence.
2Reliability
If the first control unit independently verifies information from the second control unit, then the reliability is improved through plausibility checks, but the device complexity increases due to additional verification processes
Solution Approach 1:
The verification process does not require complete re-evaluation of all subordinate controller outputs. Instead, the superordinate controller performs partial verification by checking specific plausibility criteria against sensor data, achieving improved reliability with minimal additional complexity.
Solution Approach 2:
The superordinate controller uses its own existing sensor data and processing capabilities to perform the verification, rather than requiring separate dedicated verification hardware. This self-service approach improves reliability while avoiding significant increases in device complexity.
Data Source
AI summary
A driving assistance system for a vehicle includes a first control unit and a second control unit, the second control unit configured to receive instructions from the first control unit to carry out an action, and at least one first sensor unit assigned to the first control unit. The second control unit is configured to carry out the action and to transmit information relating to the carrying out of the action to the first control unit. The first control unit is configured to check the plausibility of the information received from the second control unit on the basis of sensor data of the at least one first sensor unit.