Work Machine Self-Diagnosis Circuit for Real-Time Fault Isolation
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Solution Overview
Problem
Existing electric powered work machines lack accurate location of failure parts based on the most recent state and do not perform failure diagnosis during practical operation, relying on past usage history for estimation.
Innovation Solution
Incorporating a diagnosis circuit within the electric powered work machine that receives a diagnosis command signal, executes a failure diagnosis, and transmits a diagnosis result signal, allowing for accurate identification of failure parts based on the machine's current state, including components like a motor, tool driver, command receiver, and result transmitter, with specific diagnostic processes for motor driving circuits, current detectors, and rotational position detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If failure diagnosis is based on past usage history estimation, then the system structure remains simple, but the accuracy of failure part location deteriorates
Solution Approach 1:
The diagnosis circuit performs preliminary practical diagnosis actions by actively driving components (motor, LEDs, switching devices) and measuring their actual responses. This preliminary action during manufacturing or maintenance enables accurate identification of failure parts before actual operational failures occur, resolving the contradiction between diagnosis accuracy and system complexity.
Solution Approach 2:
The electric powered work machine performs self-diagnosis through its own diagnosis circuit that uses internal components (motor, LEDs, switching devices, detectors) to test and evaluate itself. This self-service capability eliminates the need for external complex diagnostic equipment while achieving high accuracy in failure part location.
2Measurement precision
If practical failure diagnosis is executed during operation, then the accuracy of failure part location is improved, but the risk of erroneous diagnosis increases
Solution Approach 1:
The diagnosis process is segmented into distinct sequential steps: driving a component, measuring its response, comparing against expected values, and identifying failures. This segmentation allows systematic isolation and diagnosis of individual components (motor, LEDs, switching devices, detectors) reducing erroneous diagnoses by eliminating interference from simultaneous operations.
Solution Approach 2:
The diagnosis circuit incorporates feedback mechanisms where detectors measure actual responses of driven components and feed this information back to the control circuit. The control circuit compares measured values against predetermined reference values, enabling reliable identification of deviations and failures while minimizing erroneous diagnoses through continuous verification.
Data Source
AI summary
An electric powered work machine in one aspect of the present disclosure includes a motor, a tool driver, a command receiver, a diagnosis circuit, and a result transmitter. The diagnosis circuit executes a failure diagnosis of the electric powered work machine in response to the command receiver receiving a diagnosis command signal from a diagnosis device. The result transmitter transmits a diagnosis result signal to the diagnosis device. The diagnosis result signal indicates a result of the failure diagnosis that is executed by the diagnosis circuit.