Dual Load Pressure Flow Passage for Hydraulic Pump Control
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Solution Overview
Problem
In backhoes, rapid operations during drilling lead to sudden changes in oil flow rates, causing machine instability due to the use of diaphragms in load pressure flow passages, which reduce detection sensitivity and slow down control responsibility of hydraulic actuators.
Innovation Solution
A dual load pressure flow passage system is implemented, where the first passage has a higher flow rate for actuator activation and the second passage, with a diaphragm, reduces flow rate for stability after activation, allowing quick responsibility and increased machine stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a diaphragm is provided in the load pressure flow passage to reduce detection sensitivity, then stability of the machine body is improved, but control responsibility of the main pump becomes slow
Solution Approach 1:
The load pressure flow passage is segmented into two separate passages: a first load pressure flow passage without a diaphragm for quick activation, and a second load pressure flow passage with a diaphragm for stable operation. This segmentation allows the system to achieve both quick control responsibility during activation and machine body stability during continuous operation.
Solution Approach 2:
The system dynamically switches between two different flow passages based on operational state. During activation, the first passage (higher flow rate) is used for quick response, while during continuous operation, the second passage (restricted flow rate) is used for stability. This dynamic switching resolves the contradiction between speed and stability.
2Stability of the object's composition
If the flow rate in the load pressure flow passage is reduced using a diaphragm, then detection sensitivity is dulled and control stability is improved, but activation speed becomes slow
Solution Approach 1:
The flow passage is divided into two segments with different flow characteristics. The first passage provides unrestricted flow for rapid activation, while the second passage provides restricted flow for stable control. This eliminates the time loss during activation while maintaining control stability during operation.
Solution Approach 2:
The system changes the flow rate parameter dynamically by switching between two passages. During activation, high flow rate is used to minimize activation time. During continuous operation, low flow rate is used to maintain control stability. This parameter change resolves the contradiction between activation speed and control stability.
3Stability of the object's composition
If a single load pressure flow passage with diaphragm is used, then machine stability is improved, but quick activation of hydraulic actuators cannot be achieved
Solution Approach 1:
The single flow passage is segmented into two parallel passages with different characteristics. This allows the system to achieve both quick activation (through the first passage) and machine stability (through the second passage), resolving the contradiction between productivity and stability.
Solution Approach 2:
The load pressure flow passage system serves multiple functions through its two passages: one passage is optimized for quick activation while the other is optimized for stable operation. This multi-functionality allows the system to achieve both quick activation and machine stability without compromise.
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 configuration enables quick actuator control and enhanced stability by prioritizing high flow rate during activation and restricted flow for stability post-activation, improving overall machine performance.
Implementation Method 1
a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to the PLS transmission line during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in the first load pressure flow passage
Data Source
AI summary
Provided is a load sensing system for controlling a discharge pressure of the hydraulic pump so as to render a differential pressure obtained by subtracting a maximum load pressure among the hydraulic actuators from a discharge pressure of the hydraulic pump to be a constant pressure, and there are provided: a first load pressure flow passage which introduces load pressures of the hydraulic actuators to be outputted to a PLS transmission line which transmits the maximum load pressure among the hydraulic actuators at the time of activating the hydraulic actuators; and a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to the PLS transmission line during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in the first load pressure flow passage.