Load-Sensing Hydraulic Pressure Control for Variable Standby Flow
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Solution Overview
Problem
Existing hydraulic systems with Load Sensing technology face inefficiencies in pump operation, particularly when lower flow rates are required, and high standby consumption and dissipation, lacking flexibility and adjustment options.
Innovation Solution
A hydraulic system incorporating a 2-position 3-way proportional valve controlled by pressure signals or preloaded springs, allowing for management of the pressure jump between supply and Load Sensing pressures, enabling adjustable flow rate regulation and reduced standby consumption through proportional pressure reducing valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed standby pressure is imposed via dosing niches of the slider, then a fixed flow rate is imposed independent of LS pressure, but pump consumption and dissipation increase
Solution Approach 1:
The patent applies dynamics by making the standby pressure variable rather than fixed. The dosing niches of the slider are configured to impose a standby pressure that varies as a function of the Load Sensing (LS) pressure. This means the standby pressure dynamically adjusts based on system conditions, allowing the pump to consume less energy when lower pressures are required while maintaining adequate flow rate control across different operating conditions.
2Adaptability or versatility
If Load Sensing systems are used to manage multiple utilities, then flow rate diversification is achieved, but system complexity and pre-established settings rigidity increase
Solution Approach 1:
The patent applies parameter changes by making the standby pressure a variable parameter that changes as a function of LS pressure. Instead of having fixed, pre-established settings for standby pressure, the system allows this parameter to vary dynamically. This provides greater adaptability for managing multiple utilities with different flow rate requirements while reducing the rigidity of pre-calibrated settings, as the system can automatically adjust to different operating conditions.
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 solution enhances system flexibility, optimizes energy consumption, and allows for variable torque and power control, improving sensitivity and efficiency by adjusting the standby value based on operational conditions.
Implementation Method 1
controlled by the pressure signal provided by at least one proportional pressure reducing valve
Implementation Method 2
2-position 3-way proportional valve controlled by the pressure signal provided by at least one proportional pressure reducing valve
Data Source
AI summary
A hydraulic system comprises a valve distributor comprising one or more sections connectable to respective uses, a supply apparatus comprising a pump and a supply channel, a discharge channel connected to a low-pressure tank, a use signal channel coming from the section of the valve distributor and further comprises a hydraulic regulating device connected via said channels which includes a 2-position 3-way proportional valve configured so as to provide operative fluid at a conditioned pressure, different with respect to the pressure that is characteristic of the operative condition of use, to the supply apparatus and at least one proportional pressure reducing valve.