Hydraulic Control Valve Feedback for Undersupply and Backpressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic systems in agricultural tractors face inefficiencies due to undersupply or backpressure issues in hydraulic consumers, leading to restricted work functions and excessive pressure buildup, which existing technologies fail to effectively detect and mitigate.
Innovation Solution
A hydraulic control valve system with a main spool valve, pressure compensation valve, and metering orifice, equipped with sensors to detect pressure differences, and a control unit to adjust the spool valve position and pump operation based on these differences, ensuring efficient hydraulic supply by maintaining a constant flow rate and preventing excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the main spool valve is opened to increase volume flow to the hydraulic consumer, then the hydraulic supply capacity is improved, but the system pressure increases excessively due to backpressure when no significant flow is needed
Solution Approach 1:
The patent employs a sensor arrangement that continuously monitors the pressure difference across the metering orifice and feeds this information back to the control unit. The control unit evaluates this pressure difference signal and automatically adjusts the main spool valve position to maintain optimal hydraulic supply, preventing both undersupply and excessive pressure buildup. This closed-loop feedback mechanism resolves the contradiction by dynamically balancing flow delivery with pressure management.
Solution Approach 2:
The patent replaces traditional purely mechanical pressure regulation mechanisms with an electronically controlled system. The control unit processes the pressure difference signal electronically and actuates the main spool valve through electronic control, enabling more precise and responsive regulation of hydraulic flow and pressure compared to conventional mechanical systems.
2Stability of the object's composition
If the pressure compensation valve is used to maintain constant flow rate, then the flow stability is improved, but the system cannot detect inefficient operating states such as undersupply or backpressure
Solution Approach 1:
The patent introduces a sensor arrangement that measures the pressure difference across the metering orifice and provides feedback signals to the control unit. This enables the system to detect inefficient operating states such as undersupply or backpressure conditions while the pressure compensation valve maintains stable flow rate, thus resolving the contradiction between flow stability and operating state detection.
Solution Approach 2:
The sensor arrangement acts as an intermediary between the hydraulic system and the control unit, translating physical pressure differences into detectable electrical signals. This intermediary component enables the control unit to gain information about system operating states without disrupting the flow-stabilizing function of the pressure compensation valve.
3Area of stationary object
If multiple hydraulic control valves are combined into a control valve block, then the space utilization is improved, but the detection of hydraulic supply inefficiencies in individual consumers becomes more difficult
Solution Approach 1:
The patent implements individual sensor arrangements and control units for each hydraulic control valve within the control valve block. This segmentation approach allows each valve-consumer pair to be monitored and controlled independently, enabling detection of hydraulic supply inefficiencies in individual consumers even though multiple valves are physically combined in a compact block structure.
Solution Approach 2:
The patent employs a standardized sensor arrangement and control unit design that can be universally applied to each hydraulic control valve in the block. This modular, multi-functional approach enables efficient detection and control of multiple hydraulic consumers using similar technological components, resolving the contradiction between compact integration and individual monitoring capability.
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 effectively detects and addresses inefficiencies by adjusting the hydraulic supply, preventing undersupply and excessive pressure, thereby optimizing the operation of hydraulic consumers and reducing energy consumption.
Implementation Method 1
the pressure compensation valve is controlled in accordance with a pressure difference falling at the metering orifice as the volume flow passes through
Implementation Method 2
including a restoring spring force of a spring element prestressing the pressure compensation valve into a fully open position
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Arrangement (10) for operating a hydraulic consumer (16), comprising a hydraulic control valve (20) with a main spool valve, a pressure compensation valve and a measuring orifice, wherein a hydraulic volume flow in the direction of hydraulic connections (42) provided for the operation of the hydraulic consumer (16) can be specified by means of the main spool valve, wherein the pressure compensation valve is actuated according to a pressure difference falling at the measuring orifice when the volume flow passes through it, such that it assumes a control position that is at least partially closed when the hydraulic pressure in the direction of the volume flow in front of the measuring orifice is greater than that behind the measuring orifice including a restoring spring force of a spring element that biases the pressure compensation valve into a fully open position.In this case, a sensor arrangement (64) detects the pressure difference and transmits a derived pressure difference value to a control unit (54), whereby the control unit (54) concludes, by evaluating the pressure difference value, that there is a mismatch in the hydraulic supply on the part of the hydraulic control valve (20) if the pressure difference is smaller than a control value given by the restoring spring force.