Work Machine Controller Power Cycling During Auto Idle
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Solution Overview
Problem
Work machines like hydraulic excavators face decreased work efficiency when power supply to controllers with self-diagnosing functions is interrupted during stopped operations, hindering work device usage.
Innovation Solution
Implement a system with a first controller for work device operation and a second controller for auto idle control, allowing power interruption and resumption to perform self-diagnosis without affecting work efficiency, using a relay to manage power supply based on auto idle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply to the first controller is interrupted to enable self-diagnosis, then self-diagnosis frequency is improved, but work device operation is hindered and work efficiency decreases
Solution Approach 1:
The control system is divided into two separate controllers: a first controller that manages work device operations and a second controller that manages power supply interruption and self-diagnosis. This segmentation allows the first controller to maintain work operations continuously while the second controller periodically interrupts power to enable self-diagnosis, thus resolving the contradiction between diagnosis frequency and work efficiency
Solution Approach 2:
The second controller acts as an intermediary between the power supply system and the first controller. It selectively interrupts and restores power to the first controller based on whether work operations are active, enabling self-diagnosis during idle periods while preventing interruption during work operations, thereby maintaining both reliability and productivity
2Reliability
If power supply is interrupted during stopped state to perform self-diagnosis, then self-diagnosis function is improved, but work operations are hindered when machine is stopped for work
Solution Approach 1:
The power supply control system dynamically adjusts its behavior based on the operational state of the work device. When work operations are detected, power supply interruption is prevented. When the machine is in a stopped state with no work operations, power interruption is permitted to enable self-diagnosis. This dynamic adaptation resolves the contradiction between self-diagnosis capability and work device operability
Data Source
AI summary
A work machine includes: a work device; an operation device operating the work device; a first controller controlling operation of the work device on the basis of operation of the operation device; and a second controller determining that an auto idle condition is satisfied and performing auto idle control that decreases an engine revolution speed to an idle revolution speed in case the operation device is not operated for a predetermined time. The first controller diagnoses presence or absence of a failure in the first controller when supply of power to the first controller is started. The second controller performs power interruption control that interrupts the supply of the power to the first controller in case the auto idle condition is satisfied, and performs power supply control that starts the supply of the power to the first controller afterward.