Wheel Hub Motor Fault Tolerance for Sensor Failure Across Full Speed Range
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Solution Overview
Problem
Current distributed wheel hub driving systems for electric vehicles lack a comprehensive decision-making mechanism to handle random and complex sensor failure conditions across various velocity ranges, leading to potential safety hazards and instability.
Innovation Solution
A fault-tolerant control method and system that diagnoses current and position/velocity sensor failures using sensorless algorithms and multivariable decision-making models, selecting appropriate control strategies based on velocity range and sensor conditions to ensure continuous operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensorless algorithms are used to replace position/velocity sensors during failure, then system reliability is improved, but control precision deteriorates at low velocities
Solution Approach 1:
The system dynamically switches between different sensorless algorithms based on velocity range. At high velocities, back-EMF-based algorithms are used; at low velocities, high-frequency injection algorithms are employed. This dynamic adaptation resolves the contradiction by optimizing measurement precision for each operating condition while maintaining overall system reliability through continuous fault-tolerant operation.
Solution Approach 2:
The system changes operational parameters (algorithm selection) based on velocity conditions. By monitoring velocity range and switching between different sensorless algorithms, the system adapts its control strategy to maintain precision across the full velocity spectrum while relying on sensorless operation for fault tolerance.
2Adaptability or versatility
If multiple sensorless algorithms are implemented for different velocity ranges, then adaptability is improved, but device complexity increases
Solution Approach 1:
The control system implements dynamic algorithm selection based on real-time velocity feedback. The system automatically transitions between back-EMF-based algorithms at high velocities and high-frequency injection algorithms at low velocities, achieving full-range adaptability through a unified dynamic control architecture rather than multiple independent systems.
Solution Approach 2:
The fault-tolerant control system serves multiple functions: it operates in normal mode with sensors, switches to sensorless mode upon failure detection, and further adapts between different sensorless algorithms based on velocity. This multi-functional design achieves high adaptability while consolidating control logic into a single universal system.
3Reliability
If comprehensive fault diagnosis and multiple control strategies are implemented, then system reliability is improved, but control system complexity increases
Solution Approach 1:
The system performs preliminary fault diagnosis by continuously monitoring sensor signals and comparing them against expected behavior patterns. When anomalies are detected, the system proactively switches to appropriate sensorless algorithms before complete failure occurs, maintaining reliability through advance preparation and seamless transitions.
Solution Approach 2:
The system implements continuous feedback loops that monitor sensor performance, velocity conditions, and control effectiveness. Based on this feedback, the system automatically adjusts its operation mode and algorithm selection, achieving high reliability through adaptive closed-loop control while managing complexity through systematic feedback processing.
Data Source
AI summary
The present invention belongs to the technical field of electric automobiles and particularly relates to a fault tolerance decision-making method and system for sensor failure of a vehicular wheel hub driving system. The method comprises a current sensor failure diagnostic process, a position/velocity sensor failure diagnostic process and a selection process for a wheel hub motor fault tolerance control method. The system comprises a current sensor failure diagnostic module, a position/velocity sensor failure diagnostic module and a selection module for a wheel hub motor fault tolerance control method. The position/velocity sensor failure diagnostic module further comprises a fault tolerance control switching module. The present invention has the characteristics of establishing a control strategy decision-making mechanism oriented to random complicated current and position sensor failure conditions and designing a multivariable decision-making model according to a vehicular velocity range and a sensor fault condition to realize a fault tolerance control process compatible with a full velocity range.