Hydraulic Pump Pressure Control for Faster Load-Sensing Response
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Solution Overview
Problem
Existing hydraulic supply systems, particularly electrohydraulic load sensing systems, face challenges in responding quickly to changes in consumer load sensing pressure, leading to increased reaction time and reduced system efficiency, and there is a need for alternative methods to optimize control strategies based on operational and economic requirements.
Innovation Solution
A control system that adjusts pump supply pressure based on the rate of change of load sensing pressure, using electronic controllers to determine the rate of change and apply dynamic pressure differentials to enhance response time and efficiency, with configurable threshold values and application periods to suit different operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electrohydraulic load sensing systems are used to control pump supply pressure, then system efficiency is improved, but response time increases and dynamic adjustment capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the pressure differential dynamic rather than static. The control system automatically adjusts the pressure differential between pump supply pressure and load sensing pressure based on operational conditions, allowing the system to respond dynamically to changing demands while maintaining energy efficiency. This resolves the contradiction by enabling both efficient operation and fast response through adaptive control.
Solution Approach 2:
The patent changes the parameter of pressure differential from a fixed value to a variable parameter that can be adjusted based on operational requirements. By modifying this key parameter dynamically, the system achieves both energy efficiency (through optimized pressure management) and rapid response (through increased pressure differential when needed), resolving the technical contradiction between efficiency and response time.
2Stability of the object's composition
If static pressure differential is maintained in load sensing systems, then system stability is improved, but adaptability to varying operational conditions deteriorates
Solution Approach 1:
The patent transforms the static pressure differential into a dynamic parameter that adapts to operational conditions. The control system modifies the pressure differential based on real-time demands, enabling the system to maintain stability during normal operation while adapting quickly to varying conditions, thus resolving the contradiction between stability and adaptability.
Solution Approach 2:
By changing the pressure differential parameter from fixed to variable, the system achieves both stability (through controlled pressure management) and adaptability (through automatic adjustment based on operational conditions), resolving the technical contradiction.
3Speed
If dynamic pressure differential is applied to improve response time, then response speed is improved, but system complexity increases
Solution Approach 1:
The patent uses feedback mechanisms where the control system continuously monitors operational conditions and automatically adjusts the pressure differential accordingly. This feedback-based approach enables fast response through dynamic pressure adjustment while keeping the control logic relatively simple and intuitive, resolving the contradiction between response speed and system complexity.
Solution Approach 2:
The control system performs self-adjustment based on monitored conditions, automatically modifying the pressure differential without requiring complex external control. This self-service capability achieves rapid response while maintaining relatively simple system architecture, resolving the technical contradiction.
Data Source
AI summary
A control system for hydraulic supply system which includes electronic load sensing is configured to adjust the pump supply pressure PSP in dependence on a determined rate of increase of a load sensing pressure LSP. Below a threshold value T of the rate of increase of the load sensing pressure LSP, the pump supply pressure PSP is adjusted so that it is higher than the load sensing pressure LSP by a stand-by pressure differential ΔPst. At or above the threshold value T, the pressure differential is increased to include a dynamic pressure differential ΔPdyn in addition to the stand-by pressure differential ΔPst. A method of controlling a hydraulic system is also disclosed.