Serial Communication Safety Controller for EV Battery Systems
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Solution Overview
Problem
Existing serial communication systems in high-risk applications, such as electric vehicle battery management, face challenges in accurately detecting fault conditions and ensuring safety due to the complexity of balancing power, efficiency, cost, and redundancy.
Innovation Solution
A safety controller is introduced to monitor and evaluate communications between a main controller and subsidiary units through a data bus, outputting a safety signal through a separate connection to address potential fault conditions, thereby enhancing fault detection and safety in electric vehicle battery management systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety controller is added to monitor communications on the data bus, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
A safety controller is introduced as an intermediary component that monitors communications between the main controller and subsidiary units. The safety controller evaluates data integrity and detects fault conditions without disrupting the existing data bus operations, thereby improving reliability while maintaining a clear separation of safety monitoring functions from primary control functions.
Solution Approach 2:
The system is segmented into distinct functional components: the main controller for primary control, subsidiary units for specific functions, and a separate safety controller for monitoring. This segmentation allows the safety controller to independently verify communications and detect faults without adding complexity to the core control logic of the main controller.
2Measurement precision
If communication monitoring is implemented through a separate connection, then measurement precision of fault conditions is improved, but device complexity increases
Solution Approach 1:
The safety controller connects to the data bus through a separate communication path, allowing it to independently verify data transmissions between the main controller and subsidiary units. This separate connection enables precise fault detection by comparing expected communications with actual communications without interfering with the primary data bus operations.
Solution Approach 2:
The safety controller receives copies of communications transmitted on the data bus through its separate connection. By evaluating these copied communications, the safety controller can detect faults with high precision while the original data bus continues to operate independently, minimizing the impact of the monitoring system on overall device complexity.
3Reliability
If redundant safety monitoring is added to serial communication, then reliability is improved, but loss of information increases due to additional evaluation overhead
Solution Approach 1:
The safety controller performs self-service by independently evaluating communications for fault conditions using predetermined criteria. It autonomously determines whether communications indicate fault conditions and generates appropriate safety signals without requiring extensive information exchange with other system components, thereby improving reliability while minimizing information processing overhead.
Solution Approach 2:
The safety controller implements a feedback mechanism where it continuously monitors communications and compares them against expected patterns. When deviations indicating fault conditions are detected, the safety controller generates safety signals that provide feedback to the system, enabling timely fault response while maintaining efficient information processing through targeted monitoring rather than comprehensive data analysis.
Data Source
AI summary
Serial communication verification and safety control is disclosed. A multi-part system such as a battery management system can include distributed or subsidiary components for determining status of various parts of the system with the components in serial or point-to-point communication with a collective main controller. A safety controller can be implemented to passively be coupled to the serial or point-to-point communication between the main controller and the subsidiary units. The safety controller can monitor and verify the communication between the main controller and the subsidiary units and send a safety command or verification indicator in another line of communication separate from the communication bus between the main controller and the subsidiary units.