Variable-Speed Volume Flow Supply for Stable LS Hydraulics
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Solution Overview
Problem
Existing hydraulic systems suffer from significant pressure losses due to surplus volume flow, which affects system stability and efficiency, particularly in closed centre LS systems.
Innovation Solution
A volume flow supply system incorporating a circulation pressure balance and a controller, such as a PID controller, to regulate hydraulic pump speed based on pressure sensor feedback, reducing surplus volume flow to a minimum, and using a variable-speed hydraulic pump and measuring orifices to maintain system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a circulation pressure balance is used to discharge surplus volume flow, then system stability is improved, but hydraulic losses increase due to the surplus volume flow
Solution Approach 1:
The patent applies dynamics by using a variable-speed hydraulic pump that can adjust its operating speed according to actual system demand. This allows the pump to match its output to the consumer's requirements, minimizing surplus volume flow that would otherwise be discharged through the circulation pressure balance, thereby reducing hydraulic losses while maintaining system stability.
Solution Approach 2:
The patent implements feedback control through a controller that receives signals about system conditions and adjusts the hydraulic pump's speed accordingly. This closed-loop control enables the system to respond to changing demands in real-time, optimizing the balance between maintaining stability and minimizing energy losses from surplus flow discharge.
2Loss of energy
If a variable-speed hydraulic pump with controller is used to minimize surplus volume flow, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical pressure regulation systems with an electrically controlled variable-speed pump system. This substitution allows for more precise and flexible control of volume flow, improving energy efficiency by matching pump output to actual demand, while the electronic control system provides easier adjustment compared to mechanical alternatives.
3Loss of energy
If pump speed is adjusted to match demand, then hydraulic losses are reduced, but control system complexity increases
Solution Approach 1:
The patent changes the operating parameters of the hydraulic pump by adjusting its speed rather than using fixed-speed operation with mechanical flow control. This parameter change allows the system to minimize hydraulic losses by matching pump output to demand, while the control system manages the complexity through electronic regulation.
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 achieves stable operation with minimized hydraulic losses by adjusting hydraulic pump speed to match demand, improving system efficiency and reducing pressure sensor accuracy requirements, thus enhancing control quality and energy efficiency.
Implementation Method 1
pressure sensor feedback
Implementation Method 2
circulation pressure balance which discharges a possible surplus volume flow out of the supply flow
Implementation Method 3
variable-speed hydraulic pump and measuring orifices to maintain system stability
Data Source
AI summary
The disclosure relates to a volume flow supply, in particular for closed center LS systems, comprising a pressure supply device and a pressure balance as components of a supply system for supplying fluid of a load which can be hydraulically connected to the supply system. The pressure supply device provides a volume flow when required in order to supply the hydraulic load in that the pressure balance is made of a circulation pressure balance which discharges a possible surplus volume flow out of the supply flow. The volume flow supply also comprises a controller which reduces the surplus volume flow to a minimum by actuating the pressure supply device.