Boom Regeneration Valve Control for Stable Hydraulic Descent
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Solution Overview
Problem
Existing construction machines with energy regeneration systems face challenges in controlling the descending speed of booms due to pressure changes in accumulators, leading to deviations from the operator's manipulation intention.
Innovation Solution
A construction machine equipped with a boom regeneration valve, accumulator, regeneration motor, and control device that adjust the flow rate of working fluid based on accumulator pressure to maintain consistent boom speed and recover potential energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an energy regeneration system is applied to accumulate high-pressure working fluid in an accumulator, then fuel consumption is reduced, but the pressure changes make it impossible to control the boom speed according to the operator's manipulation intention
Solution Approach 1:
The control device receives signals from the operating device (joystick) and continuously adjusts the opening area of the boom regeneration valve based on the relationship between the operating signal and accumulator pressure. This feedback mechanism ensures that the boom descending speed matches the operator's manipulation intention while maintaining energy regeneration functionality.
Solution Approach 2:
The system dynamically changes the opening area of the boom regeneration valve as a controllable parameter. By adjusting this parameter based on operating signals and accumulator pressure, the system maintains consistent boom speed control despite pressure variations in the accumulator, resolving the contradiction between energy regeneration and operational control.
2Measurement precision
If the opening area of the boom regeneration valve is constantly adjusted to maintain boom speed, then control precision is improved, but energy regeneration efficiency decreases
Solution Approach 1:
The system dynamically adjusts the opening area of the boom regeneration valve based on real-time operating conditions and accumulator pressure. This dynamic adjustment allows the system to maintain precise boom speed control while optimizing energy regeneration by adapting to changing conditions rather than using fixed settings.
Solution Approach 2:
The opening area of the boom regeneration valve is changed as a dynamic parameter based on the relationship between operating signals and accumulator pressure. This parameter change enables the system to balance control precision and energy regeneration efficiency by opening the valve more when energy regeneration is prioritized and closing it when precise speed control is needed.
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
The system improves fuel economy and allows precise control of boom speed according to the operator's intention by compensating for pressure changes in the accumulator, enhancing energy efficiency.
Implementation Method 1
a pressure of the working fluid discharged from the head side of the boom cylinder is changed by the accumulator
Implementation Method 2
a regeneration motor configured to produce renewable energy by performing a regenerative operation by using the working fluid discharged from the boom cylinder or the working fluid discharged from the accumulator
Implementation Method 3
a boom cylinder configured to move the boom upward or downward and includes a head side and a rod side
Data Source
AI summary
An embodiment of the present disclosure provides a construction machine, which includes a boom, the construction machine including a boom cylinder configured to move the boom upward or downward and includes a head side and a rod side, a boom regeneration valve configured to control a flow rate of a working fluid discharged from a head side of the boom cylinder, an operating device configured to generate an operating signal for operating the boom, an accumulator configured to store the working fluid discharged from the boom cylinder, a regeneration motor configured to produce renewable energy by performing a regenerative operation by using the working fluid discharged from the boom cylinder or the working fluid discharged from the accumulator, and a control device configured to correct an opening area of the boom regeneration valve on the basis of pressure of the accumulator when the boom descends.