Dual-Pump Hydraulic Control for Lower Flow Rate Loss
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Solution Overview
Problem
Hydraulic machines experience flow rate loss, limiting their efficiency, and there is a need for improved efficiency in hydraulic systems.
Innovation Solution
A hydraulic machine configuration that includes multiple pumps and a controller to optimize pump displacements and rotation speeds based on operator input, adjusting displacements and speeds to minimize flow rate loss and maximize torque and power output within predetermined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydraulic machines operate with fixed pump displacements and speeds, then the system structure is simple, but flow rate loss occurs and efficiency is limited
Solution Approach 1:
The patent implements dynamic adjustment of pump displacements and rotation speeds based on real-time hydraulic circuit requirements. The controller continuously monitors flow rate demands and adjusts pump parameters accordingly, transforming the static pump system into a dynamic one that adapts to varying operational conditions, thereby minimizing flow rate loss and improving overall efficiency
Solution Approach 2:
The system changes operational parameters (pump displacement and rotation speed) to optimize performance. By varying these parameters according to actual hydraulic demands, the system avoids fixed-parameter inefficiencies and reduces energy loss while maintaining simple structural design
2Force
If pump displacements are increased to maximize torque output, then torque capability improves, but flow rate loss increases and efficiency decreases
Solution Approach 1:
The controller dynamically adjusts pump displacement based on real-time torque requirements rather than maintaining fixed high displacement. This dynamic adaptation allows the system to achieve necessary torque output while minimizing excessive displacement that would cause flow rate loss and efficiency degradation
Solution Approach 2:
The system optimizes the relationship between displacement and speed parameters, changing them in coordination to achieve optimal torque output. By adjusting both parameters simultaneously rather than maximizing displacement alone, the system achieves force requirements while maintaining efficiency
3Quantity of substance
If multiple pumps operate at high speeds to meet flow rate demands, then flow rate supply is sufficient, but energy consumption increases and fuel efficiency decreases
Solution Approach 1:
The system dynamically adjusts pump rotation speeds to match actual flow rate demands rather than operating at constant high speeds. The controller monitors hydraulic circuit requirements and modulates pump speeds accordingly, ensuring sufficient flow rate supply while minimizing unnecessary energy consumption and improving fuel efficiency
Solution Approach 2:
The controller implements periodic monitoring and adjustment of pump operations, switching between different operational states (including idle or reduced-speed states) based on varying flow rate demands, thereby optimizing energy usage while maintaining adequate hydraulic supply
4Loss of energy
If pump displacements are reduced to minimize flow rate loss, then efficiency improves, but torque output capability decreases
Solution Approach 1:
The system coordinates changes in both displacement and speed parameters to maintain the optimal balance. When displacement is reduced to minimize flow rate loss, the controller compensates by adjusting speed or coordinating with the other pump, ensuring torque output requirements are met while maintaining efficiency improvements
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 solution enhances hydraulic machine efficiency by reducing flow rate loss, optimizing pump operation, and maintaining efficiency during idling conditions, thereby improving overall performance and fuel efficiency.
Implementation Method 1
A hydraulic machine performing work by operating a working device using hydraulic power
Data Source
AI summary
Provided is a hydraulic machine including an actuator, a first pump and a second pump configured to supply pressurized fluid to the actuator, a driving motor configured to drive the first and second pumps, a first operator input device through which an operator's desire to operate the actuator is input, and a controller. The controller determines displacements of the first and second pumps corresponding to the operator's desire and a speed of rotation of the driving motor and controls the first pump, the second pump, and the driving motor to operate according to the displacements of the first and second pumps and the speed of rotation of the driving motor finally determined in the determination of the displacements of the first and second pumps.