Electric Working Machine Circuit Diagnosis Sequencing
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Solution Overview
Problem
The increasing number of function circuits in electric power tools for self-diagnosis leads to higher processing loads, which can negatively impact the operation of the tools.
Innovation Solution
An electric working machine with multiple circuits and a control circuit that executes diagnoses one by one, with different timing and weighting for each diagnosis, prioritizing critical circuits and adjusting diagnosis frequency based on weighting, and suspending diagnoses when the motor is not driven.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of function circuits performing self-diagnosis increases, then reliability of the electric power tool increases, but the processing load for self-diagnosis increases
Solution Approach 1:
The patent applies dynamics by making the diagnosis execution frequency variable rather than fixed. The control circuit dynamically adjusts which circuits are diagnosed and how frequently based on priority levels. High-priority circuits are diagnosed more frequently and earlier in the sequence, while low-priority circuits are diagnosed less frequently. This dynamic allocation of diagnosis resources resolves the contradiction by optimizing the balance between comprehensive monitoring (reliability) and processing burden (complexity).
Solution Approach 2:
The patent changes the parameter of diagnosis frequency for different circuits. Instead of uniform diagnosis timing, the control circuit assigns different execution frequencies based on circuit priority. This parameter change allows critical circuits to be monitored more intensively while reducing the overall processing load by less frequently diagnosing non-critical circuits, thus resolving the technical contradiction between reliability and processing complexity.
2Reliability
If multiple diagnoses are executed simultaneously, then diagnosis coverage increases, but operation of the electric power tool is influenced negatively
Solution Approach 1:
The patent segments the self-diagnosis process into sequential stages rather than executing all diagnoses simultaneously. The control circuit divides multiple circuit diagnoses into different time slots and execution priorities. This segmentation allows the system to maintain comprehensive diagnosis coverage while preventing the processing load from negatively impacting tool operation, as diagnoses are distributed over time rather than concentrated in a single simultaneous operation.
Solution Approach 2:
The patent implements periodic action by executing diagnoses at different timings and frequencies based on circuit priority. High-priority circuits undergo more frequent diagnosis cycles, while low-priority circuits are diagnosed less frequently. This periodic approach ensures adequate monitoring coverage across all circuits while managing the processing load to avoid interfering with normal tool operation.
3Loss of time
If diagnosis frequency is increased for all circuits, then detection timeliness improves, but processing load increases
Solution Approach 1:
The patent applies local quality by assigning different diagnosis frequencies to different circuits based on their priority levels. Critical circuits receive higher diagnosis frequency for timely fault detection, while non-critical circuits receive lower frequency. This localized differentiation of diagnosis intensity resolves the contradiction by concentrating processing resources on circuits where timely detection is most important, rather than uniformly increasing frequency across all circuits.
Data Source
AI summary
An electric working machine in one aspect of the present disclosure includes two or more circuits and a control circuit. The control circuit executes two or more diagnoses one by one in order. The diagnoses at least include a first diagnosis and a second diagnosis. The first diagnosis diagnoses a first circuit. The second diagnosis diagnoses a second circuit. The control circuit executes the first diagnosis or the second diagnosis at a first diagnosis timing. The control circuit executes the first diagnosis or the second diagnosis at a second diagnosis timing. The second diagnosis timing follows the first diagnosis timing.