By-wire Motor Control Circuit Phase Switching Safety
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Solution Overview
Problem
Existing by-wire motor control systems face challenges in ensuring safety during system abnormalities, such as noise-generated abnormal signals or power supply voltage reductions, as they may inadvertently switch the motor's energized phases incorrectly due to RAM garbling or other issues.
Innovation Solution
A motor control apparatus comprising a by-wire control circuit and a second control circuit, where the by-wire control circuit pre-stores tables to determine the correct energized phase for motor rotation, and a drive permission code is used to ensure proper access to these tables, preventing incorrect phase switching even in the presence of abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a by-wire control circuit pre-stores a table of energized phases and sequentially increments the energized phase pattern number to switch phases, then motor rotation control is achieved, but system abnormality (e.g., RAM garbling) may cause incorrect phase switching
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple types of tables (first table with energized phase pattern numbers, second table with energized phases, third table with correction data) in the control circuit before operation. When abnormality is detected, the correction data from the third table is immediately applied to correct the energized phase pattern number without requiring system restart or complex processing, thus preventing incorrect phase switching while maintaining ease of motor control operation
Solution Approach 2:
The patent introduces an intermediary mechanism by adding a third table that stores correction data as a mediator between the energized phase pattern number and the actual energized phase selection. This correction table acts as a safety layer that intercepts and corrects abnormal phase pattern numbers before they can cause incorrect motor phase switching, thereby improving reliability without compromising the control functionality
2Reliability
If a monitor control circuit prohibits motor control when abnormality is detected, then safety is improved, but motor control cannot be resumed without system restart
Solution Approach 1:
The patent applies preliminary action by pre-storing correction data in the third table that enables immediate correction of abnormal energized phase pattern numbers. When abnormality is detected, the system can instantly retrieve and apply the correction data to restore correct phase switching without requiring system restart, thus maintaining both high safety and continuous productivity
Solution Approach 2:
The patent introduces dynamics by making the control system adaptive and self-correcting. The system dynamically switches between normal operation mode and correction mode based on detected abnormalities. The correction data in the third table is activated only when needed, allowing the system to maintain high availability by quickly transitioning from abnormal state to corrected state without permanent shutdown
3Device complexity
If the energized phase pattern number is sequentially incremented to simplify control, then control complexity is reduced, but RAM garbling may cause abnormal phase switching
Solution Approach 1:
The patent introduces an intermediary correction table (third table) that stores correction data as a mediator between the simple sequential counter and the critical phase switching operation. This correction layer intercepts potentially abnormal phase pattern numbers and corrects them before they reach the phase switching logic, thereby maintaining control simplicity while ensuring phase switching accuracy
Solution Approach 2:
The patent applies preliminary action by pre-storing correction data for various abnormal phase pattern numbers in the third table. This preparation in advance allows the system to immediately correct RAM garbling errors without adding complex real-time detection and correction logic, thus maintaining simple control structure while improving reliability
Data Source
AI summary
A motor control apparatus includes a by-wire control circuit for sequentially switching an energized phase of a motor. The by-wire control circuit pre-stores a first table defining an energized phase address corresponding to each address and a second table defining an energized phase corresponding to each energized phase address. When receiving a drive permission code from a second control circuit, the by-wire control circuit switches the energized phase in a correct order of driving the motor, by calculating an address for access to the first table based on the drive permission code, calculating an energized phase address corresponding to the address by referring to the first table, and determining the energized phase corresponding to the energized phase address by referring to the second table.