Dual Three-Phase Motor Controller Fault Deactivation
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Solution Overview
Problem
In dual three-phase motor electric power conversion control systems, when communication between controllers is disabled, it is difficult to determine whether the error is due to a faulty communication line or a secondary failure in one of the controllers, leading to potential motor lock states and unsuitable prompt switching to one system operation, especially in vehicle motor driver systems.
Innovation Solution
The system includes a first and second electric power conversion apparatus with converters, controllers, and signal wires, where the first controller can forcibly deactivate the second converter upon communication error, and the second controller can switch to one system operation if it detects a fault in the first controller, eliminating the need for mutual monitoring between systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual monitoring function is provided in both systems, then fault detection capability is improved, but system complexity and response time are worsened
Solution Approach 1:
The patent extracts the monitoring function from the non-host system and concentrates it in the host system only. The host controller performs all monitoring tasks including checking communication lines, monitoring the other system's status, and detecting faults, while the non-host controller focuses solely on power conversion operations. This eliminates the complexity of mutual monitoring while maintaining fault detection capability.
Solution Approach 2:
Instead of having both systems monitor each other equally (mutual monitoring), the patent inverts the approach by having one system (host) monitor the other (non-host). This single-direction monitoring reduces system complexity while still providing comprehensive fault detection capability.
2Measurement precision
If logical product (AND) of host and non-host monitoring functions is used, then fault judgment accuracy is improved, but switching response time is worsened
Solution Approach 1:
The host controller preliminarily determines faults by itself using its monitoring data before involving the non-host controller. The host checks communication lines, monitors the non-host system status, and can independently judge faults, eliminating the need for time-consuming logical product operations between both controllers and achieving prompt switching.
3Reliability
If communication line failure is not distinguished from controller failure, then system reliability is worsened, but diagnostic complexity is improved
Solution Approach 1:
The patent uses the communication line itself as an intermediary to diagnose faults. The host controller checks whether the communication line is functioning by attempting communication with the non-host controller. If communication fails, the host can distinguish between communication line failure (no response from non-host) and controller failure (non-host responds but indicates its own fault), thereby improving reliability without adding diagnostic complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This setup allows for reliable and prompt switching to one system operation, ensuring continuous motor drive even in communication failures, without requiring mutual monitoring between the dual system controllers, thus preventing motor lock states and meeting the demand for swift system switching in vehicle applications.
Implementation Method 1
a first converter which converts direct current electric power into alternating current electric power in order to feed electric power to a first winding wire of a dual three-phase motor; a second converter which converts direct current electric power into alternating current electric power in order to feed electric power to a second winding wire of the dual three-phase motor
Data Source
AI summary
An electric power conversion control apparatus includes: a first converter of the first electric power conversion control apparatus and a second converter of the second electric power conversion control apparatus, which feed electric power to a first winding wire and a second winding wire of a dual three-phase motor; a first controller and a second controller, which control the first converter and the second converter; a communication line, which is connected between the first controller and the second controller; and a fifth signal wire for deactivating the operation of the second converter, from the first controller. When a fault is caused by communication errors, the first controller uses the fifth signal wire to deactivate the operation of the second converter, and the electric power conversion control apparatus switches to one system operation by the first controller.