Rotary Electric Machine Control Device Abnormality Backup
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Solution Overview
Problem
Existing rotary electric machine control devices face delays in abnormality detection, leading to potential erroneous outputs due to the time gap between abnormality detection and confirmation, which can result in incorrect steering assistance in electric power steering systems.
Innovation Solution
A rotary electric machine control device with multiple drive circuits and control units for respective winding sets, implementing abnormality detection time backup control upon detection and shifting to abnormality confirmation time backup control when the abnormality is confirmed, thereby reducing the period until backup control is initiated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If abnormality detection is performed with confirmation delay, then measurement precision is improved, but loss of time increases and reliability deteriorates
Solution Approach 1:
The system performs preliminary abnormality detection without requiring confirmation delay. The detection unit immediately identifies abnormalities in the monitoring target, and the backup control unit is pre-configured to activate instantly upon detection, eliminating the time loss between detection and backup control while maintaining detection accuracy through the dedicated detection unit design
2Loss of time
If abnormality detection is performed immediately, then loss of time is reduced, but reliability may worsen due to potential false detections
Solution Approach 1:
The system segments the abnormality detection function into a dedicated detection unit separate from the backup control unit. This segmentation allows the detection unit to immediately identify abnormalities without confirmation delay, while the separate backup control unit receives verified abnormality signals, thus achieving both immediate response and high reliability through functional separation
3Reliability
If multiple control units are provided for respective systems, then reliability is improved through redundancy, but device complexity increases
Solution Approach 1:
The backup control unit is designed with multi-functionality to handle various abnormality scenarios across different systems. Instead of creating separate dedicated backup units for each system, the single backup control unit can universally manage abnormalities in any monitored system, thus achieving reliability through redundancy while minimizing device complexity through universal design
Data Source
AI summary
A rotary electric machine control device includes multiple drive circuits provided for respective winding sets in a rotary electric machine, and multiple control units. When combinations of the winding sets and configurations provided correspondingly to the respective winding sets are defined as systems, the control units are provided for the respective systems. Each of the control units controls energization of the winding set provided correspondingly, and monitors an abnormality of a monitoring target. Each of the control units performs an abnormality detection time backup control during a period from detection of the abnormality of the monitoring target to confirmation of the abnormality, and performs an abnormality confirmation time backup control when the abnormality is confirmed.