Maintenance information device, condition sensor for use therein and method which can be carried out therewith for arriving at a decision whether or not to perform servicing or maintenance

摘要

A maintenance information device and method for performing condition-based maintenance by monitoring of the condition of a technical system using a sensor. In order to permit the use of relatively simple sensors with relatively simple evaluation logics, the method and device perform decision making processes on the basis of hyperordinal signals from imperfect hyperordinal condition sensors.

主权项

1. A maintenance information device for supplying information for condition-based maintenance of a technical system, comprising:
an ordinal sensor having a sensor element configured to monitor at least one load variable or wear variable of the technical system as an indicator of a maintenance-relevant condition of the system, the sensor being further configured to supply an ordinal condition signal; an operating-scope-detection device configured to detect a cumulated scope of the operation of the system as a value of an operating scope parameter; an expected-value-supplying device configured to supply a degradation function which represents the expected degradation profile of the condition, which can be determined by the load variable or wear variable, as a function of the operating scope parameter; a remaining-service-life-determining device which is configured to perform at least one of a) and b) as follows:
a) when at least one predetermined degree of degradation of the condition occurs, compare the current value reached for the operating scope parameter with the value of the operating scope parameter which is expected for this predetermined degree of degradation according to the expected degradation profile and due to the current value of the operating scope parameter, supply a recalibrated expected degradation profile of the condition plotted against the operating scope parameter; andb) when at least one predetermined value of the operating scope parameter occurs, compare the current degree of degradation of the condition detected by the sensor with the value of the operating scope parameter which is expected according to the expected degradation profile given this degree of degradation and, due to the current degree of degradation, supply a recalibrated expected degradation profile of the condition plotted against the operating scope parameter; and a maintenance-recommendation-generating device configured to generate a maintenance recommendation for a future planning time period on the basis of the recalibrated expected degradation profile.