Excavator Front Implement Control for Cylinder Pressure Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The precision of excavation construction in machine control for work machines like hydraulic excavators varies due to differences in cylinder internal pressures immediately before the start of driving, affecting the driving velocity and accuracy of the front work implement.
Innovation Solution
A work machine with an articulated-type front work implement and hydraulic actuators, where a controller corrects the operation signal based on information from the hydraulic actuators to ensure precise movement on a target surface, using area limiting control and adjusting the operation signal to account for variations in cylinder internal pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If semi-automatic control is used for machine control of front work implement, then excavation precision along target surface is improved, but variation in precision occurs between different starting points due to cylinder internal pressure differences
Solution Approach 1:
The controller performs preliminary correction of the operation signal based on cylinder internal pressure information obtained immediately before the start of driving. This preliminary action compensates for pressure variations before they affect the driving velocity, ensuring consistent excavation precision across different operation cycles and starting points.
Solution Approach 2:
The system obtains feedback information regarding cylinder internal pressure immediately before driving starts and uses this feedback to correct the operation signal. This closed-loop feedback mechanism adjusts for pressure variations dynamically, maintaining reliable and consistent excavation precision throughout the operation cycle.
2Speed
If cylinder internal pressure varies between operation cycles, then driving velocity precision of front work implement deteriorates, but this variation is difficult to control in conventional semi-automatic systems
Solution Approach 1:
The controller automatically performs the correction of the operation signal using obtained cylinder pressure information without requiring manual intervention. The system serves itself by autonomously compensating for pressure variations, maintaining driving velocity precision while keeping the operation simple and easeful for the user.
3Manufacturing precision
If area limiting control is implemented to correct operation signal, then excavation precision is improved, but additional control complexity is introduced
Solution Approach 1:
The controller changes the parameters of the operation signal based on obtained cylinder pressure information before area limiting control is applied. By adjusting the operation signal parameters in advance, the system achieves improved excavation precision while the complexity is managed through automated parameter adjustment rather than complex mechanical modifications.
Data Source
AI summary
An articulated-type front work implement has a boom, an arm, and a bucket that are driven members coupled to each other; a boom cylinder, an arm cylinder and a bucket cylinder that are hydraulic actuators each of which drives a corresponding one of the plurality of driven members on the basis of an operation signal; a plurality of operation members each outputting the operation signal to one of the hydraulic actuators; and a controller that outputs the operation signal to at least one of the plurality of hydraulic actuators or executes area limiting control of correcting the output operation signal such that the front work implement moves on a target surface preset for a work target of the front work implement or within an area above the target surface, and corrects the operation signal on the basis of information related to operation of the hydraulic actuator.