Hydraulic Flow Control for Option Actuator Overload Prevention
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Solution Overview
Problem
Hydraulic machines face challenges in maintaining optimal workability while preventing damage to option actuators, as existing systems often supply working fluid at insufficient flow rates when multiple manipulators are used, leading to reduced performance and potential actuator damage.
Innovation Solution
A hydraulic machine design that includes multiple working fluid supplies, flow control valves, and a controller to dynamically adjust flow rates based on manipulator signals, ensuring the first supply operates at its capacity and the second supply contributes only when necessary, thereby preventing excessive flow rates and enhancing workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second working fluid supply is controlled to discharge working fluid at a flow rate equal to the second capacity, then the option actuator receives sufficient flow rate for high workability, but the option actuator may be damaged due to excessive flow rate
Solution Approach 1:
The patent implements dynamic control of the second working fluid supply based on real-time detection of the first working fluid supply's discharge status. The controller adjusts the second supply's flow rate dynamically - discharging at full second capacity when the first supply is insufficient, and reducing or stopping discharge when the first supply is sufficient - thereby adapting the system's total flow output to match the option actuator's actual needs and prevent damage while maximizing workability.
Solution Approach 2:
The patent employs a feedback mechanism where the controller continuously monitors the flow rate discharged by the first working fluid supply and uses this information to adjust the second working fluid supply accordingly. This closed-loop control ensures that the combined flow rate from both supplies never exceeds the option actuator's maximum allowable flow rate, preventing damage while optimizing productivity.
2Reliability
If the second flow control valve is moved to cut off the second fluid path, then the option actuator is protected from excessive flow rate, but the speed of the option working device is significantly reduced
Solution Approach 1:
Instead of statically cutting off the second fluid path, the patent dynamically adjusts the second flow control valve's opening degree based on real-time flow rate detection from the first working fluid supply. This dynamic adjustment allows the system to optimize the combined flow rate to match the option actuator's capacity, maintaining high operating speed while preventing damage from excessive flow rates.
Solution Approach 2:
The patent changes the flow rate parameter of the second working fluid supply based on the detected performance of the first supply. By adjusting the second supply's flow rate parameter in response to the first supply's actual discharge, the system optimizes the total flow to the option actuator, ensuring both safety and high-speed operation without unnecessary cutoffs.
3Productivity
If the first working fluid supply is controlled to discharge working fluid at a flow rate equal to the first capacity, then the option actuator receives maximum flow rate from the first supply, but the second working fluid supply cannot contribute additional flow rate
Solution Approach 1:
The patent implements dynamic control where the first working fluid supply's flow rate is adjusted based on real-time detection of the second supply's discharge status. When the second supply is actively discharging, the first supply reduces its flow rate accordingly, allowing both supplies to contribute effectively to the option actuator. This dynamic coordination enables combined operation capability while maximizing total flow rate delivery.
Solution Approach 2:
The patent merges the output of the first and second working fluid supplies in a coordinated manner. By detecting the discharge status of one supply and adjusting the other accordingly, the system ensures that both supplies work together synergistically to provide the optimal total flow rate to the option actuator, enabling effective combined operation while maintaining high productivity.
Data Source
AI summary
A first required flow rate is calculated as a function of a first maximum allowable flow rate and a value of a first signal. A second required flow rate is calculated as a function of a value of the second signal. When the first maximum allowable flow rate is higher than a first capacity, the value of the first signal is a maximum level, and the value of the second signal is equal to or higher than a minimum level and equal to or lower than a maximum level, a first working fluid supply is controlled to discharge working fluid at a flow rate equal to the first capacity, and a second working fluid supply is controlled to discharge working fluid at a flow rate obtained by deducting the first capacity from the first maximum allowable flow rate, added to the second required flow rate.