Hydraulic Pressure Compensation for Precise Flow Distribution
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Solution Overview
Problem
Traditional load-sensitive engineering machinery hydraulic systems face issues with pressure difference constancy under flow saturation and pressure over-limit conditions, leading to uncontrolled actuator speed and response lag, making high-precision flow distribution and micro-motion precise-positioning operations challenging.
Innovation Solution
The introduction of an electronic pressure compensating valve with real-time differential pressure regulation, enabled by a controller and sensors, allows for proportional shunt control and high-precision flow distribution by adjusting compensating differential pressure based on operating conditions, using a proportional electromagnet, linear motor, or rotating motor-driven ball screw mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional pressure compensating valve with constant differential pressure is used, then the system structure is simple and energy efficiency is high, but the actuator speed becomes uncontrolled under flow saturation and pressure over-limit conditions
Solution Approach 1:
The patent transforms the static constant differential pressure compensating valve into a dynamic adjustable one by introducing an electronic pressure compensating valve with adjustable opening degree. The valve opening is dynamically adjusted based on real-time pressure feedback from sensors, allowing the differential pressure to vary according to actual system needs rather than remaining fixed. This enables controlled actuator speed even under flow saturation and pressure over-limit conditions.
Solution Approach 2:
The invention changes the fixed parameter (constant differential pressure) into a variable parameter by using an electronically controlled valve with adjustable opening degree. The control system modifies the valve opening parameter based on pressure sensor feedback, thereby changing the differential pressure parameter dynamically to maintain proper actuator speed control across different operating conditions.
2Measurement precision
If load-sensitive technology with constant differential pressure is used, then the circuit is simple and energy efficiency is high, but response lag and poor stability occur making high-precision flow distribution difficult
Solution Approach 1:
The patent introduces pressure sensors that continuously detect actual system pressure and feed this information back to the control system. The controller compares the detected pressure with the target pressure and dynamically adjusts the electronic pressure compensating valve opening degree to minimize the difference. This closed-loop feedback mechanism eliminates response lag and achieves high-precision flow distribution by continuously adapting to changing system conditions.
Solution Approach 2:
The invention replaces the traditional purely mechanical pressure compensating valve with an electronic pressure compensating valve that incorporates electronic sensors and control systems. This substitution of mechanical systems with electronic control enables faster response times and higher precision by using electronic signal processing and automated feedback control rather than relying solely on mechanical pressure balancing.
3Productivity
If the pressure compensating valve maintains constant differential pressure, then the system is stable under normal conditions, but flow mismatch occurs under pressure over-limit and flow saturation conditions
Solution Approach 1:
The patent makes the differential pressure dynamic rather than static by using an electronically controlled compensating valve. The valve opening degree is continuously adjusted based on real-time pressure feedback, allowing the system to adapt to extreme conditions such as pressure over-limit and flow saturation. This dynamic adjustment prevents flow mismatch by maintaining appropriate pressure differentials even when operating conditions exceed normal ranges.
Solution Approach 2:
The invention uses pressure sensors to continuously monitor system pressure and provides feedback to the control system. When pressure over-limit or flow saturation conditions occur, the feedback mechanism detects the deviation and automatically adjusts the electronic pressure compensating valve to restore proper flow distribution. This feedback control ensures both productivity and reliability by preventing flow mismatch while maintaining system stability under extreme 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 effectively addresses flow mismatch and instability under pressure over-limit and flow saturation conditions, enhancing system control range and efficiency, enabling quick response and precise operation of actuators.
Implementation Method 1
a proportional electromagnet, connected with the compensating valve body, acting on a right end face of the compensating valve core
Implementation Method 2
a displacement sensor, integrated with the proportional electromagnet, and signal terminals of the proportional electromagnet and the displacement sensor are respectively connected with the controller
Implementation Method 3
a spring, one end of which acts on a left end face of the compensating valve core, and the other end of which acts on the compensating valve body
Data Source
AI summary
The present invention provides an engineering machinery hydraulic system with compensation differential pressure controllable, uses an electronic pressure compensating valve to solve the problem of flow mismatch under conditions of pressure over-limit and flow saturation, and realizes proportional shunt control and high-precision flow distribution of the system. The engineering machinery hydraulic system disclosed in the present invention has the advantages of low energy consumption, fast response speed, and high flow control precision.