Motor Control Device Synchronizing Microcomputer Initial Checks
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Solution Overview
Problem
Conventional motor control devices with redundant microcomputers face challenges in synchronizing the initial check and startup of multiple systems, leading to potential erroneous determinations and instability in motor drive control due to timing differences and power supply variations.
Innovation Solution
A motor control device with multiple power converters and microcomputers performs initial checks on components and synchronizes calculations through inter-computer communication, allowing for synchronized startup and switching between single-system and multi-system drive modes based on diagnosis results, using a two-stage timeout approach to ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microcomputers perform initial checks independently after activation, then each microcomputer can detect abnormalities in its own system, but timing differences and power supply variations cause synchronization issues leading to erroneous determinations and control instability
Solution Approach 1:
The patent applies preliminary action by having all microcomputers perform their initial checks and determine abnormality results before any motor drive operation begins. This ensures that the abnormality determination is made on a stable basis before dynamic operation starts, preventing timing-related erroneous determinations. The microcomputers complete their self-diagnosis and inter-computer communication in the initial phase, establishing a reliable baseline for subsequent synchronized operation.
Solution Approach 2:
The patent merges the initial check operations of multiple microcomputers into a coordinated process. Instead of each microcomputer operating completely independently, they perform their checks in parallel during the activation phase, then communicate their results to each other before motor drive begins. This merging of timing and coordination prevents synchronization issues that would occur if checks were performed at different times during operation.
2Measurement precision
If microcomputers determine abnormality based on comparison of sensor detection values and command values, then abnormal conditions can be identified, but timing differences in power supply onset cause measurement inconsistencies leading to erroneous abnormality determinations
Solution Approach 1:
The patent performs the sensor value comparison and abnormality determination as a preliminary action during the activation phase, before motor drive operation begins. At this stage, the system is in a known initial state with stable power supply conditions, eliminating timing-related measurement inconsistencies. The microcomputers compare their sensor readings and command values during this stable initial period, ensuring accurate abnormality detection without the interference of operational timing variations.
3Reliability
If a microcomputer stops operation when determined abnormal, then safety is maintained, but switching between single-system and multi-system drive modes requires coordinated communication to avoid control conflicts
Solution Approach 1:
The patent performs the abnormality determination and system mode selection as a preliminary action before motor drive operation begins. During the activation phase, microcomputers communicate their abnormality results to each other and collectively determine which systems will operate. This preliminary coordination establishes the operational configuration (single-system or multi-system drive mode) before any motor control begins, eliminating the complexity of real-time mode switching during operation while maintaining safety through pre-validated system selection.
Data Source
AI summary
A motor control device is provided with a plurality of power converters and a plurality of microcomputers, and controls driving of a motor that has a plurality of sets of windings. The microcomputers perform initial check of components in respective circuits after activation. The microcomputers prohibit driving of the motor by a circuit determined to be abnormal during the initial inspection. When two or more circuits are determined to be normal in the initial check, the microcomputers start driving of the motor by synchronizing the timing between the two or more circuits determined to be normal. When only one circuit is determined to be normal in the initial check, the microcomputers start driving of the motor by the one circuit determined to be normal.