Hydraulic Excavator Front Implement Control for Target-Surface Accuracy
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Solution Overview
Problem
Conventional machine control systems in work machines like hydraulic excavators face issues with work accuracy due to improper enabling/disabling of automatic control and incorrect setting of work contents, leading to excessive excavation or soil transport errors.
Innovation Solution
A work machine equipped with sensors and controllers that sense posture and load information, set work areas, and perform operation correction control to ensure the front work implement maintains a predetermined position or posture relative to a target surface, using a controller to adjust operations based on sensed data and predefined operation forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually switches enabling/disabling of automatic control by operating the operating member, then the operator can control when MC is active, but the operator may forget to operate the operating member, causing MC to be disabled and reducing work accuracy
Solution Approach 1:
The system automatically determines whether to activate machine control based on the current work status and operation conditions, eliminating the need for manual operator intervention. The controller autonomously switches MC enabling/disabling based on sensed parameters and predefined criteria, ensuring reliability without requiring operator memory or action.
Solution Approach 2:
The system continuously monitors operation signals from the operation device and automatically adjusts MC activation status based on the current work state. This feedback mechanism ensures that MC is activated or deactivated appropriately based on real-time conditions, preventing errors from manual switching failures.
2Adaptability or versatility
If the operator manually sets work contents and assistance contents, then the operator can customize MC parameters, but the operator may set them erroneously, causing the work device to be in incorrect posture and reducing work accuracy
Solution Approach 1:
The system automatically determines appropriate work contents and assistance contents based on the current operation state and work conditions, eliminating manual parameter setting. The controller autonomously configures MC parameters by analyzing operation signals and sensed data, preventing erroneous settings while maintaining adaptability to different work scenarios.
Solution Approach 2:
The system pre-defines multiple operation forms with associated work contents and assistance parameters. When a specific work status is detected, the corresponding pre-configured parameters are automatically applied, ensuring accurate work device positioning without requiring manual operator input that could lead to errors.
3Reliability
If the operator forgets to switch MC enabling/disabling or sets parameters erroneously, then inappropriate MC operation cannot be performed, but the system complexity increases requiring more sensors and control logic
Solution Approach 1:
The controller integrates multiple functions including automatic MC activation/deactivation, work status determination, operation form selection, and parameter configuration into a single control unit. This multi-functional approach ensures reliable MC operation while avoiding the need for separate complex subsystems for each function.
Solution Approach 2:
The system uses operation signals from the operation device and data from existing sensors to automatically determine work status and configure MC parameters. This feedback-based approach ensures appropriate MC operation without requiring additional complex control logic or numerous specialized sensors, leveraging existing system components.
Data Source
AI summary
A working status indicating a status related to the present work of a hydraulic excavator 1 is determined on the basis of operation signals output from a control lever 24, posture information output from inertial measuring devices 27 to 30, load information output from pressure sensors 32 and 33, and a work area set by a display input device 26, an operation form indicating contents of an operation in operation correction control of a front work implement 12 is decided from a plurality of operation forms set in advance, according to the determined working status, and the operation correction control is performed such that the front work implement moves according to the operation form. Thus, an appropriate assisting operation can be performed in machine control, so that the work accuracy can be improved.