Dual Motor Control System with Automatic Failure Switching
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Solution Overview
Problem
Conventional electric power steering systems face challenges in accurately recovering from failures of control units and motor windings, requiring redundant configurations but struggling with efficient switching mechanisms to maintain system reliability and driver comfort.
Innovation Solution
A motor control system with dual control circuits, monitoring circuits, and a switching circuit that allows for interconnection modes to seamlessly switch control between circuits upon failure detection, ensuring rapid recovery and minimal driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant control units are provided to improve reliability, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into multiple independent control units (first control unit 10 and second control unit 20), each capable of independently controlling the motor circuits. This segmentation allows redundancy while maintaining manageable complexity through modular design.
Solution Approach 2:
Both control units are designed with identical functional capabilities, including monitoring circuits and communication interfaces. Either control unit can perform all control functions for the motor circuits, providing universal functionality that enables seamless failover without increasing operational complexity.
2Measurement precision
If monitoring circuits and communication paths are added to detect failures, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The monitoring circuits are merged with the control units themselves rather than being separate external systems. Each control unit contains its own monitoring circuit that checks the operational state of the control unit, integrating monitoring functionality into the existing structure and reducing overall system complexity.
Solution Approach 2:
Monitoring communication paths provide continuous feedback about the operational state of control units to each other. This feedback mechanism enables automatic failure detection and triggers the switching circuit to transfer control to the standby unit, achieving precise failure detection through existing communication infrastructure.
3Reliability
If a switching circuit is implemented to transfer control between units, then reliability is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The switching circuit acts as an intermediary component that automatically transfers control between the first and second control units based on failure detection. This intermediary mechanism simplifies the overall system by providing a dedicated, simple switching function rather than requiring complex control logic within each control unit to manage failover.
Solution Approach 2:
The control units perform self-diagnosis through their monitoring circuits and automatically trigger the switching mechanism when failures are detected. The system serves itself by detecting its own failures and initiating the recovery process without external intervention, reducing the need for complex external control mechanisms.
4Productivity
If automatic recovery switching is implemented, then productivity is improved through rapid recovery, but device complexity increases
Solution Approach 1:
The second control unit is pre-configured as a standby unit with all necessary control capabilities before any failure occurs. The switching circuit is pre-programmed to immediately transfer control to the second unit upon detection of a failure in the first unit, enabling rapid recovery without requiring complex real-time decision-making or reconfiguration procedures.
Data Source
AI summary
A motor control system includes plural control circuits and plural motor circuits. Each motor circuit includes an inverter circuit and a coil. The plural motor circuits are controlled by any one of the control circuits or controlled by the plural control circuits in combination. When any one of the control circuits controlling the motor circuits fails, the motor control system performs switching control so that the failing control circuit is disconnected while another normally-operating control circuit controls the corresponding motor circuit. The failure detection and switching control are performed smoothly and quickly to recover the motor control system from the failure, thus enhancing the reliability.