公开(公告)号：US20140129035A1

公开(公告)日：2014-05-08

申请号：US13671399

申请日：2012-11-07

Applicant: CATERPILLAR INC.

Inventor： Matthew S. Marquette ,  Gavin D.O. Ripley ,  Bryan A. Johnson ,  Jason L. Brinkman ,  Aristoteles Rosa Neto

IPC: G05D7/06

CPC classification number: F15B19/002 ,  B62D5/075 ,  F15B2211/20576 ,  F15B2211/4053 ,  F15B2211/41518 ,  F15B2211/6654 ,  F15B2211/7142

Abstract: A computer-based method for calibrating a solenoid-controlled excess flow control valve that couples a first hydraulic circuit to a second hydraulic circuit is provided. The method includes determining a start-of-flow current at which hydraulic fluid begins to flow, closing the valve, sending an actuator command to the second hydraulic circuit, determining a first flow through the hydraulic actuator, opening the valve by setting the solenoid current to a calibration-flow current, sending the actuator command to the second hydraulic circuit, determining a second flow through the hydraulic actuator, calculating a flow difference, determining a calibration-flow valve command associated with the flow difference, determining a maximum-flow current based on the start-of-flow current, the calibration flow current, and the calibration-flow valve command, and creating a valve calibration table based on the start-of-flow current, the maximum-flow current and a valve response table.

Abstract translation: 提供了一种用于校准将第一液压回路耦合到第二液压回路的螺线管控制的过量流量控制阀的基于计算机的方法。 该方法包括确定液压流体开始流动的起始流量电流，关闭阀门，向第二液压回路发送致动器指令，确定通过液压致动器的第一流量，通过设置螺线管电流来打开阀门 将执行器命令发送到第二液压回路，确定通过液压致动器的第二流量，计算流量差，确定与流量差有关的校准流量阀门命令，确定最大流量电流 基于起动流量电流，校准流量电流和校准流量阀命令，并且基于流动起始流量，最大流量电流和阀响应表创建阀校准表。

公开(公告)号：US09599238B2

公开(公告)日：2017-03-21

申请号：US14678101

申请日：2015-04-03

Applicant: Caterpillar Inc.

Inventor： Matthew J. Beschorner ,  Bryan A. Johnson ,  Hideki Nakajima

IPC: F16K11/07

CPC classification number: F16K11/0712 ,  F15B13/0402 ,  F15B13/0405 ,  F15B13/0417 ,  F15B2013/008 ,  F15B2211/30575 ,  Y10T137/86461

Abstract: A spool is disclosed for use in a valve. The spool may have an elongated cylindrical body with a first end and a second end. The spool may also have a first land formed at the first end, a second land axially spaced apart from the first land, and a check element located between the first and second lands. The check element may have an outer diameter that is about 0.5-1% greater than an outer diameter of the second land.