公开(公告)号：US20050022589A1

公开(公告)日：2005-02-03

申请号：US10628837

申请日：2003-07-28

Applicant: Hongliu Du

Inventor： Hongliu Du

IPC: G01M99/00 ,  F15B19/00

CPC classification number: F15B19/005

Abstract: A method and apparatus for determining the operating health of a hydraulic system are provided. The method may include the steps of determining a plurality of operating parameters of the hydraulic system during operation of the hydraulic system, determining an estimated working condition value of the hydraulic system, modifying the estimated working condition value as a function of the operating parameters, and determining the operating health of the hydraulic system as a function of the working condition value. In one method, the working condition value may be indicative of an effective bulk modulus value of an operating fluid within at least part of the hydraulic system.

Abstract translation: 提供了一种用于确定液压系统的运行健康的方法和装置。 该方法可以包括以下步骤：在液压系统的操作期间确定液压系统的多个操作参数，确定液压系统的估计工作状态值，修改作为运行参数的函数的估计工作状态值;以及 根据工作状态值确定液压系统的运行状况。 在一种方法中，工作条件值可以指示至少部分液压系统内的工作流体的有效体积模量值。

公开(公告)号：US06375433B1

公开(公告)日：2002-04-23

申请号：US09611387

申请日：2000-07-07

Applicant: Hongliu Du ,  Noah D. Manring

Inventor： Hongliu Du ,  Noah D. Manring

IPC: F04B4900

CPC classification number: F04B49/08 ,  F04B1/324 ,  F04B2201/12051 ,  F04B2205/05 ,  F04B2205/06

Abstract: A method and apparatus for controlling a pump discharge pressure of a variable displacement hydraulic pump having a swashplate, and a servo valve for controlling an angle of inclination of the swashplate. The method and apparatus includes sensing a value of an actual pump discharge pressure, determining a desired control pressure using a first feedback linearization control law, determining a desired servo valve spool position using a second feedback linearization control law, and controlling the value of the actual pump discharge pressure as a function of the first and second feedback linearization control laws.

Abstract translation: 一种用于控制具有斜盘的可变排量液压泵的泵排出压力的方法和装置，以及用于控制斜盘角度的伺服阀。 该方法和装置包括检测实际泵排出压力的值，使用第一反馈线性化控制定律确定期望的控制压力，使用第二反馈线性化控制定律确定期望的伺服阀阀芯位置，以及控制实际的 泵排出压力作为第一和第二反馈线性化控制规律的函数。