Rotary Electric Machine Control Synchronization via End Signals
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Solution Overview
Problem
Conventional control systems for rotary electric machines may prematurely start drive control before the initial check is completed by another control device, leading to incomplete determination of normal operation or prolonged waiting for the initial check to finish, which can delay or prevent the start of drive control.
Innovation Solution
A control system with multiple control devices that perform an initial check and transmit/receive end signals, allowing drive control to start only when the initial check is completed by one device and waiting for a predetermined time if no end signal is received from another device, ensuring proper synchronization and preventing premature or delayed drive control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If drive control is started immediately after one control device completes its initial check, then drive control can start quickly, but the initial check of another control device may not be completed leading to unreliable operation
Solution Approach 1:
The control devices exchange end signals to provide feedback about the completion status of initial checks. Each control device transmits an end signal when its initial check is completed, and the other control device receives this signal to determine whether to proceed with drive control. This feedback mechanism ensures that drive control is only started when both control devices have completed their initial checks, resolving the contradiction between quick start and reliable operation.
2Reliability
If the system waits indefinitely for the end signal from another control device, then initial check reliability is ensured, but drive control start is delayed
Solution Approach 1:
The control device transmits the end signal as soon as the initial check is completed, without waiting for the other control device. This preliminary action of signal transmission ensures that the completion information is communicated immediately, allowing the receiving control device to proceed with drive control without unnecessary delays, while still maintaining reliability through the signal confirmation.
Solution Approach 2:
The system dynamically adjusts the drive control start timing based on the reception of end signals. Rather than using a fixed waiting period, the system flexibly determines the start timing based on the actual completion status of the other control device's initial check, as indicated by the end signal. This dynamic approach optimizes both reliability and response time.
3Reliability
If the system uses a predetermined waiting time to start drive control, then premature start is prevented, but drive control start may be delayed when the other control device completes its initial check quickly
Solution Approach 1:
The end signal provides real-time feedback about the completion of the other control device's initial check, replacing the need for predetermined waiting time. This feedback mechanism allows the system to accurately determine the optimal start timing based on actual conditions, preventing premature start while avoiding unnecessary delays, thus resolving the contradiction between timing accuracy and start efficiency.
Data Source
AI summary
A control system includes a plurality of control devices each including an initial check unit that performs an initial check before drive control of a rotary electric machine, a transmission/reception unit that transmits/receives an end signal indicating that the initial check is ended, and a drive control unit that performs the drive control of the rotary electric machine after the initial check. The drive control unit starts the drive control of the rotary electric machine when the initial check of the corresponding control device is ended and the end signal is acquired from another control device, and starts the drive control of the rotary electric machine after a lapse of a predetermined time from the start of the initial check of the corresponding control device when the initial check of the corresponding control device is ended and the end signal is not acquired from the another control device.