Redundant Electric Steering Startup Verification for Phase Switch Faults
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Solution Overview
Problem
Existing electric steering systems lack a method for initial verification of switch states, particularly in phase breakers, leading to potential brake torque issues due to switch abnormalities like short circuits, compromising safety and stability.
Innovation Solution
An initial verification method and device for redundant electric steering systems that verify the states of power and phase-blocking switches by forming current paths through the motor, determining control authority based on switch states, and transferring control to a redundant ECU if abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant ECUs and phase breakers are added to improve safety, then system reliability improves, but device complexity increases
Solution Approach 1:
The patent implements preliminary verification of switch states in phase breakers during system initialization or startup phase. The ECU actively checks the operational status of switches in both redundant configurations before full operation begins, detecting potential faults early to prevent unsafe operation while maintaining the redundant architecture.
Solution Approach 2:
The system incorporates feedback mechanisms where the ECU continuously monitors and verifies the states of switches in phase breakers. When abnormalities are detected in switch states, the system provides feedback to adjust control strategies or activate redundant components, ensuring safety while managing complexity through intelligent control.
2Reliability
If switch verification methods are implemented to detect abnormalities, then system reliability improves, but ease of operation deteriorates
Solution Approach 1:
The verification system operates autonomously through the ECU, which automatically performs switch state verification without requiring manual intervention. The system self-diagnoses switch abnormalities in phase breakers and manages redundant component activation, eliminating the need for complex manual verification procedures while maintaining high reliability.
3Measurement precision
If comprehensive switch verification is performed in both ECUs, then measurement precision of switch states improves, but loss of time increases
Solution Approach 1:
Switch state verification is performed during system initialization or startup phase before normal operation begins. This preliminary action ensures accurate detection of switch states in both redundant ECUs without causing time loss during actual steering operations, as the verification is completed in advance.
Solution Approach 2:
The system performs verification on critical switches in phase breakers rather than all switches in the system. By focusing verification efforts on the most critical components that directly impact safety, the system achieves sufficient measurement precision for safety-critical functions while minimizing the total verification time required.
Data Source
AI summary
The present disclosure relates to an initial verification method of a redundant electric steering system, and it is a verification method of a redundant electric steering system which includes a redundant ECU for driving a motor by using power from a power supply, and the initial verification method may include the steps of a) verifying the state of power switches constituting the power supply in each microcomputer of a first ECU and a second ECU, and determining a control right to control the motor according to a verification result of a power switch, b) verifying the state of a phase-blocking switch of a first phase breaker of the first ECU having the control right, and c) verifying the state of a phase-blocking switch of a second phase breaker of the second ECU, while the first ECU communicates with the second ECU.