Abstract: A method for creating a maintenance algorithm for a fleet of vehicles, with which maintenance information can be collected and displayed in each vehicle of the fleet. In the fleet vehicles, sensor data that are indicative of a stress on components in the vehicles are used to derive stress variables. The ascertained stress variables are stored in the vehicles for a predetermined period and, if a wear-related event occurs, wear variables that characterize a wear-related event are additionally ascertained. The stress variables and the wear variables are transmitted to a central location or station, in which the previous maintenance algorithm is checked with the use of the stress and wear variables, and, if applicable, an improved maintenance algorithm can be derived. The maintenance algorithm serves in establishing and indicating a time when the vehicle should be serviced.

Abstract: A method for creating a maintenance algorithm for a fleet of vehicles, with which maintenance information can be collected and displayed in each vehicle of the fleet. In the fleet vehicles, sensor data that are indicative of a stress on components in the vehicles are used to derive stress variables. The ascertained stress variables are stored in the vehicles for a predetermined period and, if a wear-related event occurs, wear variables that characterize a wear-related event are additionally ascertained. The stress variables and the wear variables are transmitted to a central location or station, in which the previous maintenance algorithm is checked with the use of the stress and wear variables, and, if applicable, an improved maintenance algorithm can be derived. The maintenance algorithm serves in establishing and indicating a time when the vehicle should be serviced.

Abstract: A method and apparatus for determining and extending a change interval for an operating fluid of a unit, particularly for an engine of a motor vehicle, uses at least one directly or indirectly recorded operating variable which represents the qualitative condition of the operating fluid. An evaluation of the at least operating variable and a continuous calculation of the change interval therefrom is performed by a computing and control unit. The calculated change interval is related to a specified unit service interval and, if the change interval expires before the service interval, a regeneration signal for the removal of a certain quantity of the spent operating fluid and the replacement of the quantity with a fresh operating fluid is produced as a function of the difference therebetween.