Load Sensing Control Circuit Dynamic Flow Ratio Adjustment
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Solution Overview
Problem
Conventional load sensing control circuits cannot dynamically adjust the flow dividing ratio between actuators based on varying load pressures, leading to reduced discharge and operating speed in actuators with higher load pressures, such as in a power shovel's boom cylinder.
Innovation Solution
Incorporating a drain passage that connects a compensator valve's pressure chamber to a tank and a pressure control unit, specifically a flow dividing ratio modification valve, to adjust the pressure in the chamber and modify the flow dividing ratio by controlling the opening of the compensator valve, allowing for dynamic adjustment of the flow distribution based on actuator load pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the flow dividing ratio is determined in advance according to switch amounts of switch valves, then the flow distribution is constant, but the discharge amount of the variable displacement pump becomes excessively small when a specific actuator has extremely high load pressure
Solution Approach 1:
The patent introduces a drain passage with a flow dividing ratio modification valve that enables dynamic adjustment of the flow dividing ratio. By controlling the opening degree of the modification valve, the system can change the flow distribution to specific actuators in real-time, allowing the pump discharge amount to be increased when needed while maintaining stable flow distribution under normal conditions
Solution Approach 2:
The patent modifies the flow dividing ratio parameter by adjusting the opening degree of the flow dividing ratio modification valve. This parameter change allows the system to adapt the flow distribution to match varying load conditions, preventing the pump discharge amount from becoming excessively small when specific actuators operate under high load pressure
2Ease of operation
If the flow dividing ratio is kept constant for all actuators, then the system is simple to control, but the operating speed of actuators with high load pressure decreases
Solution Approach 1:
The patent segments the flow control system by introducing a dedicated flow dividing ratio modification valve for each actuator that requires enhanced flow. This segmentation allows independent adjustment of flow distribution to specific actuators without affecting the overall control simplicity of the system
Solution Approach 2:
The flow dividing ratio modification valve acts as an intermediary device between the switch valve and the actuator. It mediates the flow distribution by adjusting its opening degree to ensure adequate flow supply to actuators with high load pressure, thereby maintaining their operating speed while preserving the simplicity of the overall control system
3Adaptability or versatility
If the switch amounts of switch valves are determined in advance, then the flow dividing ratio is fixed, but the system cannot respond to desires to modify the flow dividing ratio for specific actuators
Solution Approach 1:
The patent introduces a drain passage with a flow dividing ratio modification valve that enables dynamic adjustment of the flow dividing ratio. By controlling the opening degree of the modification valve, the system can change the flow distribution to specific actuators in real-time, allowing the pump discharge amount to be increased when needed while maintaining stable flow distribution under normal conditions
Solution Approach 2:
The patent modifies the flow dividing ratio parameter by adjusting the opening degree of the flow dividing ratio modification valve. This parameter change allows the system to adapt the flow distribution to match varying load conditions, preventing the pump discharge amount from becoming excessively small when specific actuators operate under high load pressure
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
Enables flexible adjustment of the flow dividing ratio to ensure adequate flow to actuators with higher loads, enhancing operating speed and efficiency by maintaining constant flow distribution despite varying load pressures, and allowing for on-site tuning of the flow dividing ratio according to specific operational needs.
Implementation Method 1
a drain passage that connects a first pressure chamber of at least one compensator valve to a tank, and a pressure control unit that controls a pressure in the first pressure chamber connected to the tank
Data Source
AI summary
A pump discharge amount is divided in accordance with switch amounts of respective switch valves by leading load pressures of actuators to which compensator valves are connected to respective first pressure chambers of the compensator valves, leading a maximum load pressure selected by a selection unit to respective second pressure chambers of the compensator valves, and controlling respective openings of the compensator valves in accordance with respective pressure actions between the respective pressure chambers. A drain passage is provided to connect the first pressure chamber of the compensator valve to a tank, and a flow dividing ratio modification valve is provided to control a pressure in the first pressure chamber.