Steering Torque Redundancy for Controller Fault Isolation
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Solution Overview
Problem
Existing steering control systems lack a redundant safety mechanism to detect abnormalities in the communication interface or main controller without additional hardware changes, which can compromise vehicle safety.
Innovation Solution
A steering control device and method that utilize a second torque sensor to determine abnormalities in the communication interface or main controller based on steering torque values, allowing for precise identification and mitigation of faults without separate hardware design changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant safety mechanism is implemented by adding a separate communication interface, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The assistant controller is designed to perform multiple functions: it serves as both a backup controller for safety redundancy and utilizes the existing communication interface for data exchange. This multi-functionality allows the system to achieve reliability improvement without adding separate dedicated hardware for communication, thereby avoiding increased device complexity
Solution Approach 2:
The system uses its existing communication interface and controller resources to perform the safety monitoring function. The assistant controller monitors itself and the main controller through the existing communication channel, eliminating the need for separate safety-dedicated communication hardware
2Measurement precision
If a separate communication interface is added for abnormality detection, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The existing communication interface is designed to serve dual purposes: normal operational data exchange and abnormality detection. By making the communication interface multi-functional, the system achieves precise abnormality detection capability without requiring separate dedicated communication hardware, thereby avoiding additional manufacturing costs
Solution Approach 2:
The communication interface acts as an intermediary that enables both normal operation and safety monitoring functions. By utilizing this existing intermediary infrastructure, the system achieves precise abnormality detection without the need for additional dedicated communication channels, avoiding increased manufacturing costs
Data Source
AI summary
The present disclosure provides a steering control apparatus comprising: a first control unit for controlling a motor to supply a motor torque associated with steering on the basis of a value of a first steering torque; and a second control unit for mutually monitoring operation states with the first control unit via a communication interface and, when an abnormality occurs in the first control unit, controlling the motor, wherein, when the occurrence of an abnormality associated with the operation state of the first control unit is recognized, the second control unit determines whether or not the first control unit or the communication unit is abnormal, on the basis of a value of a second steering torque. According to the present disclosure, a redundant safety mechanism can be implemented without a separate change in a hardware design.