Hydraulic Control Device Pump Power Loss Reduction
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Solution Overview
Problem
In construction machines with booms and arms, the existing hydraulic control systems experience power loss when combining boom lowering and arm pushing operations due to inefficient hydraulic oil distribution, leading to excessive supply to the boom cylinder and wastage of pump power.
Innovation Solution
A hydraulic control device with a variable capacity pump, tandem circuit, and parallel circuit configuration, including a restrictor and control unit that adjusts pump capacity based on operation amounts, prioritizes hydraulic oil supply to the boom cylinder during boom lowering and arm pushing, reducing power loss by restricting pump capacity during combined operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a restrictor is provided in the parallel circuit to guide hydraulic oil preferentially to the boom cylinder during combined operation, then the hydraulic oil can be directed to the higher load side, but the power of the first pump is lost when the boom lowering operation amount is large
Solution Approach 1:
The patent applies dynamics by making the restrictor's opening degree variable rather than fixed. The opening degree is dynamically adjusted based on the operation amount of the boom operation member, allowing the system to adapt to different operational conditions. When the boom lowering operation amount is large, the opening degree is increased to reduce power loss, while when the operation amount is small, the opening degree is reduced to maintain preferential oil supply to the boom cylinder.
Solution Approach 2:
The patent changes the parameter of the restrictor's opening degree based on the operation amount of the boom operation member. By varying this parameter dynamically, the system optimizes hydraulic oil distribution under different operational conditions, resolving the contradiction between maintaining preferential supply and reducing power loss.
2Productivity
If the opening of the center bypass passage is narrowed during boom lowering operation, then hydraulic oil is guided to the control valve for arm, but the restrictor causes extra hydraulic oil to be supplied to the boom cylinder wasting pump power
Solution Approach 1:
The restrictor's opening degree is made dynamic and is adjusted according to the operation amount of the boom operation member. This dynamic adjustment allows the system to maintain effective hydraulic oil distribution while minimizing power waste under different operational conditions.
Solution Approach 2:
The system uses feedback from the operation amount detection member to adjust the restrictor's opening degree. This closed-loop control ensures that the hydraulic oil supply is optimized based on actual operational conditions, preventing power waste while maintaining productivity.
3Productivity
If the capacity of the pump is increased in accordance with increase in boom lowering operation amount, then the pump can meet the demand, but the loss of power increases with larger operation amounts
Solution Approach 1:
The restrictor's opening degree is dynamically adjusted based on the boom lowering operation amount. This dynamic control allows the system to match pump capacity demand while minimizing power loss by optimizing hydraulic oil distribution under different operational conditions.
Solution Approach 2:
The system changes the restrictor's opening degree parameter according to the operation amount, allowing effective pump capacity utilization while reducing power loss. This parameter adjustment optimizes the balance between productivity and energy efficiency.
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 reduces power loss in the pump during combined boom lowering and arm pushing operations by optimizing hydraulic oil distribution, ensuring efficient energy use and operation.
Implementation Method 1
a restrictor that is provided in the parallel circuit in order to guide the hydraulic oil from the first pump preferentially to the boom side control valve over the arm side control valve
Data Source
AI summary
A hydraulic control device that reduces the loss of the power of a pump in combined operation of boom lowering and arm pushing. A controller performs single control of increasing capacity of a first pump in accordance with increase in an operation amount of a boom operation member, in a single operation of the boom lowering. On the other hand, the controller restricts the capacity of the first pump compared to capacity in the single control, during a restriction control period when the combined operation of boom lowering and arm pushing is detected, and the operation amount of the boom operation member is a prescribed operation amount or more.