Fault Isolation and Recovery Procedures for Electrohydraulic Valves

An electric and fault technology, which is applied in the direction of electric fluid pressure control, non-electric variable control, transportation and packaging, etc., can solve the problem of fault isolation protocol execution danger and other problems

Active Publication Date: 2017-08-04
DANFOSS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, execution of certain fault isolation protocols can be dangerous if the actuator is not in a safe state, such as when a work machine suspends the load above the ground

Method used

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  • Fault Isolation and Recovery Procedures for Electrohydraulic Valves
  • Fault Isolation and Recovery Procedures for Electrohydraulic Valves
  • Fault Isolation and Recovery Procedures for Electrohydraulic Valves

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Embodiment Construction

[0021] Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to different embodiments does not limit the scope of the appended claims to these embodiments. Furthermore, any examples given in this specification are not intended to be limiting but merely to present some of the many possible embodiments for the appended claims.

[0022] General Architecture Overview

[0023] The present disclosure generally relates to fault isolation schemes for use in hydraulic actuation systems. In some embodiments, a modular and distributed control system architecture is used. By using a modular approach, the system can reduce complexity and provide increased flexibility. Enhanced fault isolation by using a distributed architecture with overlapping and redundant fault detection strategies. A controller included in the system includes a process and a non-tr...

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Abstract

A method for isolating faulty or blocked work ports in an electrohydraulic system is disclosed. In one step, the system pump is set to a first predetermined pressure and the valve assembly is commanded to a center position. In another step, the central position of the valve is recorded. In one step, the valve assembly is opened to place a work port associated with the valve in fluid communication with the pump, after which a first end position of the valve, a first work port pressure and a first pump supply are recorded pressure. In another step, the valve assembly is opened to place the working port into a reservoir, after which the second end position of the valve and the fluid pressure associated with the working port are recorded. The recorded and measured data can then be analyzed to identify fault conditions or blocked working ports.

Description

[0001] related application [0002] This application was filed as a PCT International Patent Application on December 23, 2013, and claims priority to U.S. Patent Application Serial No. 61 / 745,947, filed December 26, 2012, the disclosure of which is hereby incorporated in its entirety Incorporated by reference. Background technique [0003] Work machines such as forklifts, wheel loaders, track loaders, excavators, trenchers, bulldozers and telehandlers are well known. Work machines may be used to move materials such as pallets, dirt and / or debris. Work machines typically include a work implement (eg, a fork) connected to the work machine. Work implements attached to work machines are typically powered by hydraulic systems. A hydraulic system may include a hydraulic pump powered by a prime mover such as a diesel engine. Work machines often have electronic control systems that rely on multiple inputs and outputs, such as pressure sensors, position sensors, and valve actuators...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B19/00
CPCF15B19/005F15B2211/8636Y10T137/0379G05D16/20G05D7/0617
Inventor M·B·拉诺V·V·马胡尔卡
Owner DANFOSS AS
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