False Signal Injection for Rotary Machine Fail-Safe Verification
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Solution Overview
Problem
In systems with rotary electric machines, the fail-safe function may not be noticed as malfunctioning when it is not operating correctly, leading to potential damage during overvoltage situations, as users are unaware of the issue until it is too late.
Innovation Solution
An abnormality diagnosis apparatus generates a false abnormality signal when the system is in a normal state to check if the fail-safe process for the rotary electric machine operates correctly, allowing for pre-emptive control measures to protect the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fail-safe function is not operating normally, then the main function continues to operate, but the user fails to notice the abnormality and the rotary electric machine is not protected when an actual abnormality occurs
Solution Approach 1:
The patent performs a preliminary check of the fail-safe function by generating a false abnormality signal while the system is in a normal state. This preliminary action allows the system to verify that the fail-safe function operates correctly before an actual abnormality occurs, preventing the loss of protection capability that would otherwise go undetected
Solution Approach 2:
The patent implements a feedback mechanism where the operation check section monitors whether the fail-safe function responds correctly to the false abnormality signal. This feedback loop ensures that any malfunction in the fail-safe function is detected and can be addressed before it compromises the reliability of the rotary electric machine protection
2Reliability
If a false abnormality signal is generated to check the fail-safe function, then the operation of the fail-safe function can be verified, but the system temporarily operates in an abnormal state
Solution Approach 1:
The patent applies partial action by generating a false abnormality signal for only the specific purpose of checking the fail-safe function, rather than inducing a full abnormal state. The check is performed selectively and temporarily, minimizing the harmful virtual abnormal state while still verifying the fail-safe operation
Solution Approach 2:
The operation check is performed periodically or at scheduled intervals when the system is in a normal state, rather than continuously. This periodic action allows verification of the fail-safe function while minimizing the duration and impact of the virtual abnormal state on the system
Data Source
AI summary
An abnormality diagnosis apparatus performs an abnormality diagnosis of a system equipped with a rotary electric machine (21). The abnormality diagnosis apparatus includes: an abnormality detection section that detects an abnormality of the system; a fail-safe processing section that, when the abnormality detection section detects an abnormality, performs a fail-safe process for controlling the rotary electric machine on a safe side; an abnormality signal generation section that, when the system is in a normal state, generates a false abnormality signal assuming that an abnormality that requires the fail-safe process has occurred; and an operation check section that performs, on the basis of the false abnormality signal generated by the abnormality signal generation section, an operation check for checking whether the fail-safe process operates normally.