Hydraulic Pump Noise Control Algorithm for Forklifts
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Solution Overview
Problem
Hydraulic pumps in work machines, such as forklifts, often generate excessive and undesirable noise due to high pressure differentials between hydraulic branch circuits, which existing technologies have not effectively addressed.
Innovation Solution
A noise control algorithm is implemented in the hydraulic system that compares hydraulic pressures across branch circuits and opens the control valve assembly associated with the lowest pressure, ensuring all other valves are closed, thereby reducing noise by allowing minimal pump flow to return to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the hydraulic pump operates at high pressure differential between hydraulic branch circuits, then the pump can deliver sufficient power to hydraulic actuators, but excessive radiant noise is generated by the pump
Solution Approach 1:
A low-noise return line is introduced as an intermediary pathway for hydraulic fluid. This separate return line allows pump discharge fluid to bypass the high-pressure branch circuits and return directly to the reservoir, eliminating the noise-generating high-pressure differential while maintaining power delivery through the正常工作 branch circuits
Solution Approach 2:
The hydraulic system is segmented into two separate fluid pathways: a working circuit that delivers power to actuators and maintains pressure differentials, and a separate low-noise return circuit that handles pump discharge fluid returning to reservoir. This segmentation isolates the noise-generating high-pressure flow from the sensitive pump environment
2Use of energy by moving object
If the pump displacement is reduced to zero position, then energy consumption is reduced, but the pump still generates noise due to pressure differentials
Solution Approach 1:
The low-noise return line acts as a mediator that provides a dedicated pathway for pump discharge fluid to return to the reservoir without creating high pressure differentials. This allows the pump to operate at zero displacement with minimal noise while maintaining 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
This method significantly reduces radiant sound output from the hydraulic pump, providing a more quiet operational environment for work machines.
Implementation Method 1
opening the control valve assembly associated with the hydraulic branch circuit having the lowest hydraulic fluid pressure... while ensuring that all remaining control valve assemblies are in a closed position
Data Source
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AI summary
A hydraulic pump radiant noise reduction method for a forklift or other work machine is disclosed. The method includes initiating a noise control algorithm that is enabled during periods when the displacement of the hydraulic pump remains in the zero displacement position and an operator is not demanding flow from any of the hydraulic branch circuits. When the noise control algorithm is enabled, the control valve assembly associated with the hydraulic branch circuit having the lowest hydraulic fluid pressure in relation to the hydraulic fluid pressures of all other hydraulic branch circuits is opened while the remaining control valve assemblies are in held or placed in a closed position. In an alternative embodiment, a drain valve assembly is provided that is opened when the noise control algorithm is activated.