LOW NOISE CONTROL ALGORITHM FOR HYDRAULIC SYSTEMS

摘要

A method for reducing radiated noise of a hydraulic pump for a forklift or other working machine is disclosed. The method includes initiating a noise control algorithm effective during a period in which the displacement amount of the hydraulic pump is maintained at a displacement amount position of zero and the operator does not require flow rate from any of the hydraulic branch circuits. When this noise control algorithm is in effect, the control valve assembly associated with the hydraulic branch circuit having the lowest hydraulic fluid pressure with respect to the hydraulic fluid pressure of all other hydraulic branch circuits is opened, and the remaining control valve assemblies remain in the closed position or installed. do. In an alternative embodiment, a drain valve assembly is provided that opens when a noise control algorithm is activated.