Hydraulic Consumer Control Using Orifice Pressure Feedback
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Solution Overview
Problem
Hydraulic consumers in agricultural tractors often experience inefficient operating states due to undersupply or pressure build-up, leading to restrictions in work functions and potential damage.
Innovation Solution
An arrangement for operating a hydraulic consumer that includes a hydraulic control valve with a main slide valve, pressure compensation valve, and orifice, where a sensor arrangement detects pressure differences across the orifice to identify mismatches in hydraulic supply, triggering adjustments to the main slide valve and pump drive to maintain optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the main slide valve is opened to increase volume flow to hydraulic consumers, then the hydraulic supply capacity is improved, but pressure build-up occurs when no flow is demanded causing system pressure to reach maximum values up to 190 bar
Solution Approach 1:
The control unit continuously monitors the pressure difference across the orifice before operating situations arise. By detecting pressure buildup trends in advance (when pressure difference becomes negligibly small), the system can preemptively adjust the main slide valve position or pump delivery rate to prevent maximum pressure buildup, rather than reacting after the problem occurs
Solution Approach 2:
A sensor arrangement measures the pressure difference across the orifice and feeds this information to the control unit. The control unit uses this feedback to evaluate whether the hydraulic supply matches actual demand, and automatically adjusts the main slide valve or pump drive to maintain optimal pressure and flow conditions, preventing both undersupply and excessive pressure buildup
2Stability of the object's composition
If the pressure compensation valve is used to ensure constant volume flow independent of supply pressure fluctuations, then flow stability is improved, but inefficient operating states cannot be detected without additional sensing
Solution Approach 1:
The pressure difference across the orifice serves as an intermediary indicator of hydraulic supply efficiency. Instead of directly monitoring complex flow conditions or consumer state, the system uses the easily measurable pressure difference as a mediator to infer whether the hydraulic supply matches demand, enabling detection of inefficient operating states without complex sensing
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 effectively identifies and mitigates inefficient operating states by ensuring a stable hydraulic supply, preventing pressure build-ups, and optimizing energy consumption based on actual demand.
Implementation Method 1
the pressure compensation valve adopts an at least partially closing control position when the hydraulic pressure upstream of the orifice in the direction of the volume flow is greater than downstream of the orifice
Implementation Method 2
including a restoring spring force of a spring element preloading the pressure compensation valve into a fully open position
Implementation Method 3
a sensor arrangement senses the pressure difference and transmits a pressure difference value derived therefrom to a control unit
Data Source
AI summary
An arrangement for operating a hydraulic consumer including a hydraulic control valve having a main slide valve defining a hydraulic volume flow in the direction of hydraulic connections provided for operation of the hydraulic consumer, a pressure compensation valve and an orifice, the pressure compensation valve controlled on the basis of a pressure difference that drops at the orifice when the volume flow passes through, such that the pressure compensation valve adopts an at least partially closing control position when the hydraulic pressure upstream of the orifice in the direction of the volume flow is greater than downstream of the orifice, including a restoring spring force of a spring element preloading the pressure compensation valve into a fully open position, and a sensor arrangement sensing the pressure difference and transmitting a pressure difference value derived therefrom to a control unit evaluating the pressure difference value.