Hydraulic Supply Assembly Electronic Control Loop
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Solution Overview
Problem
Existing hydraulic pressure medium supply arrangements for open hydraulic circuits in mobile working machines are complex and costly due to the need for hydromechanical feedback and position detection of the actuating piston, which complicates control and increases costs.
Innovation Solution
A hydraulic pressure medium supply arrangement with an electronically controllable axial piston machine that uses a pilot valve with an electrically proportional control mechanism, eliminating the need for position detection of the actuating piston and incorporating a controller with multiple control loops to manage outlet pressure, delivery volume, and torque, ensuring dynamic regulation and control without hydromechanical feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydromechanical feedback and position detection of the actuating piston are used, then control precision is improved, but device complexity and costs increase
Solution Approach 1:
The patent replaces the hydromechanical feedback system with an electronic control system. Instead of using mechanical position detection of the actuating piston, the invention uses an electronic controller that receives target values for outlet pressure, delivery volume, and torque, and electronically actuates the pilot valve to achieve the desired control without mechanical feedback components.
Solution Approach 2:
The invention extracts and removes the position detection mechanism for the actuating piston from the system. By eliminating this component, the patent simplifies the overall device structure while maintaining control functionality through electronic means alone, directly addressing the contradiction between precision and complexity.
2Manufacturing precision
If hydromechanical feedback is implemented, then control accuracy is improved, but manufacturing costs increase
Solution Approach 1:
The patent substitutes mechanical feedback components with an electronic control architecture. The electronic controller implements control algorithms for outlet pressure, delivery volume, and torque without requiring expensive mechanical position sensors and feedback mechanisms, thereby reducing manufacturing costs while maintaining control accuracy.
Solution Approach 2:
The invention employs cost-effective electronic components rather than expensive mechanical feedback systems. The electronic pilot valve actuation and controller provide the necessary control functionality at lower manufacturing cost, eliminating the need for costly position detection hardware.
3Reliability
If position detection of the actuating piston is added, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical position detection with electronic control. The electronic controller maintains system reliability by using electronic sensing and actuation of the pilot valve, which has fewer moving parts and lower complexity compared to mechanical feedback systems, thereby achieving reliability without increased complexity.
4Adaptability or versatility
If electronic control with multiple loops is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-functional electronic controller that handles multiple control objectives (outlet pressure, delivery volume, torque) within a single integrated device. This universal controller provides adaptability to different operating conditions and control requirements without requiring separate mechanical systems for each function, thereby achieving versatility without proportional increases in complexity.
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 provides a simple, cost-effective, and dynamically responsive control system that reduces complexity and costs by eliminating the need for position detection, enhancing control quality through consideration of delivery volume adjustment speed and using adaptive control parameters to optimize system dynamics.
Implementation Method 1
an electrically proportionally controllable pilot valve, via which an inflow and/or an outflow in a control chamber (46) of the actuating cylinder (34), delimited by the actuating piston (36), can be controlled
Implementation Method 2
an actuating cylinder (34) with an actuating piston (36), via which an inflow and/or an outflow in a control chamber (46) of the actuating cylinder (34), delimited by the actuating piston (36), can be controlled in order to supply the actuating piston (36) with pressure medium for actuation
Data Source
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AI summary
Disclosed is a hydraulic pressure medium supply arrangement comprising an adjustable axial piston machine, wherein a control cylinder is controlled via a pilot valve. The pilot valve is actuated by a control unit. The control unit receives as inputs a current pressure and/or a current oscillation angle of the adjustable axial piston machine. One or more of these inputs are compared with a suitable setpoint, and a control value (or values) is output. The control of these inputs is part of a first control loop. A subordinate second control loop has an input based on the control value(s), which serves as the setpoint. Another input of the second control loop is the current flow rate adjustment of the axial piston machine. The output of the second control loop is then a control value for the pilot valve.