Control Unit Fault Diagnosis on Power Reapplication Cut-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fault diagnosis methods do not effectively alert users to faults after a power source is reapplied, leading to potential delays in fault recognition and safety concerns.
Innovation Solution
A fault diagnosis method and control device that initiate a cut-off state upon power reapplication, retaining this state for a predetermined period to ensure immediate fault detection and recognition, utilizing a cut-off retaining unit, fault diagnosis unit, and forcible cut-off unit to maintain a safe operational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fault diagnosis is performed only after idle stop state release, then power feeding is controlled based on diagnosed results, but fault recognition is delayed and users cannot easily recognize faults after power reapplication
Solution Approach 1:
The patent applies preliminary action by performing fault diagnosis immediately when power is applied to the control device, before normal operation begins. The forcible cut-off unit forces the input into a cut-off state equivalent to idle stop, and the fault diagnosis unit immediately diagnoses faults in this state. This preliminary diagnosis ensures faults are detected early, before any operational delays can occur, resolving the contradiction between reliable fault detection and timely fault recognition.
2Ease of operation
If fault detect information is cleared after power source reapplication, then system resets normally, but fault information is lost and cannot be observed
Solution Approach 1:
The patent performs fault diagnosis as a preliminary action immediately upon power application, before the system would normally clear fault information. By forcing the input into a cut-off state and diagnosing faults at this early stage, the system captures fault information that would otherwise be lost during reset, while still allowing normal system operation to proceed.
Solution Approach 2:
The patent implements feedback by using the fault diagnosis results to control the power feeding state through the cut-off retaining unit. When faults are detected, the system provides feedback by maintaining the cut-off state, ensuring that fault information is not only detected but also retained and acted upon, preventing information loss while maintaining operational control.
3Reliability
If cut-off state is retained for predetermined period after fault diagnosis, then safety is improved, but operational responsiveness is reduced
Solution Approach 1:
The patent applies preliminary action by performing the fault diagnosis in a forced cut-off state before normal operation begins. This timing ensures that safety checks are completed in advance, and the cut-off state retention only occurs when faults are actually detected, not as a blanket delay for all operations. This resolves the contradiction by ensuring safety without unnecessarily slowing normal operational response.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The problem to be addressed by the present invention relates a possibility that, when fault detection information is cleared and a control unit is not activated after power of a system is turned on again, time is required to find a fault since standby has to be maintained until a time at which a diagnosis is performed again for finding the fault. The solution to this problem is a fault diagnosis method for a control device that controls power supply to an object to be controlled. When power of the control device is turned on, input to the control device, regardless of the input, is increased equivalent to that in a shut-off state, and the shut-off state is maintained by a prescribed time period. Since a fault can be detected when power of the control device is turned on, a mechanism that calls for attention at an early stage can be provided.