Method for cleaning hydraulic liquid, computerprogram product, control unit, and industrial truck

摘要

Method for cleaning hydraulic liquid in a industrial truck, wherein said industrial truck is an electrically powered industrial truck having a battery as an energy source with a hydraulic system comprising, a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of, the hydraulic pump is activated for hydraulic activity, the hydraulic pump pumps the liquid for the hydraulic activity and in relation to this return flow through the return filter to the hydraulic reservoir occurs, the hydraulic pump can be activated by means comprised in the industrial truck, when hydraulic activity is not present, by that achieving a circulation to the hydraulic reservoir through the return filter such that sufficient filtration of the hydraulic liquid is reached, further a time Tb for circulation without hydraulic activity can be accumulated and/or a sensor for determining the quality of the hydraulic oil can be arranged in the industrial truck. Termination of the circulation is based on Tb and/or the measured quality. The application also relates to a computer program product, a control unit and an industrial truck that can perform the method.

主权项

1. A method for cleaning hydraulic liquid in an industrial truck, wherein said industrial truck has an electrical motor, a battery as an energy source, and a hydraulic system including a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of:
a. activating the hydraulic pump for hydraulic activity; b. using the hydraulic pump during hydraulic activity to pump hydraulic liquid for the hydraulic activity, with a return flow passing through the return filter to the hydraulic reservoir; c. activating the hydraulic pump when hydraulic activity is not present to circulate the hydraulic liquid through the hydraulic reservoir and through the return filter to effect filtration of the hydraulic liquid when hydraulic activity is not present; andcontinuing step (c) until a sufficient purity of the hydraulic liquid is achieved as determined by at least one of the following procedures I and II and then terminating step (c) upon determination of a sufficient purity of the hydraulic liquid being achieved;
procedure I including:
accumulating a time Tb for accumulated circulation time without hydraulic activity, anddetermining that the sufficient purity has been achieved when the industrial truck reaches a predetermined value of accumulated Tb; and procedure II including:
using an industrial truck arranged sensor for measurement of a quality of the hydraulic liquid; anddetermining automatically that the sufficient purity has been reached during circulation without hydraulic activity based on a predetermined condition A for the quality of the hydraulic liquid being fulfilled.