Hydraulic Actuator Drive Control for Construction Machines
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Solution Overview
Problem
Conventional drive control methods for hydraulic actuators in construction machines fix the driving priority between the swing motor and hydraulic cylinder, leading to pressure loss and restricted flexibility in operation due to additional valve arrangements.
Innovation Solution
The implementation of electronic swing and working device operation levers, variable displacement hydraulic pumps, and electric proportional control valves, along with a controller that calculates and adjusts valve opening areas based on operation signals to dynamically determine the driving priority between the swing motor and hydraulic cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional valve arrangements are installed to distribute flow rates to swing motor and hydraulic cylinder, then driving priority can be decided, but pressure loss increases due to hydraulic hose resistance
Solution Approach 1:
The patent extracts and removes the additional valve arrangements (orifices) from the hydraulic circuit. Instead of using mechanical valves to distribute flow, the system directly connects the hydraulic pump to both the swing motor and hydraulic cylinder, eliminating the pressure loss caused by valve resistance while maintaining driving priority control through electronic management.
Solution Approach 2:
The patent replaces the mechanical valve-based flow distribution system with an electronically controlled system. The driving priority is managed through electronic signals that control the hydraulic pump's displacement, substituting mechanical valve arrangements with electronic control mechanisms to reduce pressure loss.
2Productivity
If conventional hydraulic circuit with multiple valves is used, then flow distribution is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple valves into a single integrated electronic control system. Instead of having separate valves for swing motor and hydraulic cylinder, the system uses one variable displacement hydraulic pump controlled by electronic signals to manage flow distribution to both actuators, simplifying the overall device structure.
Solution Approach 2:
The patent makes the hydraulic pump universal by enabling it to serve multiple functions: controlling both the swing motor and hydraulic cylinder through electronic displacement management. This multi-functional approach eliminates the need for dedicated valves for each actuator, reducing device complexity while maintaining flow distribution capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for flexible and efficient adjustment of driving priority, enhancing working efficiency by independently controlling the electric proportional control valves, thereby improving operational flexibility and reducing pressure loss.
Implementation Method 1
first electric proportional control valves at an inlet line and an outlet line of the swing motor for supplying and discharging the hydraulic fluid of the hydraulic pump, respectively; second electric proportional control valves at an inlet line and an outlet line of the hydraulic cylinder for supplying and discharging the hydraulic fluid of the hydraulic pump, respectively
Data Source
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Figure 3
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AI summary
Disclosed is a drive control method of a hydraulic actuator of a construction machine, wherein the method is for calculating an upper rotation body and a working device so as to carry out complex work. The present invention provides a drive control method of a hydraulic actuator of a construction machine, the method comprising the steps of: determining whether a rotation operation lever and a working device operation lever are operated; calculating the required pressure of a hydraulic cylinder for a working device according to the operation amount of the rotation operation lever; calculating the required flow rates of a swing motor and the hydraulic cylinder for the working device, the required flow rates corresponding to the operation amounts of the working device operation lever and the rotation operation lever; calculating the opening areas of the first and second proportional solenoid valves of an inlet side and an outlet side by using the calculated required pressure and required flow rates of the hydraulic cylinder for the working device and the swing motor; and calculating current values to be inputted into the first and second proportional solenoid valves of the inlet side and the outlet side according to preset data values or a table in comparison with the calculated opening areas of the first and second proportional solenoid valves of the inlet side and the outlet side.