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Abstract

A method for storing run data of a vehicle in a data memory of an electronic tachograph and displaying the run data with a predetermined resolution. The method includes the steps of sensing the movement of the vehicle, providing digital distance and velocity data from signals of the sensing step proportional to the travel distance of the vehicle and the instantaneous velocity, respectively, and reading the digital data into successive cells of the data memory of the tachograph in predetermined regular periods corresponding to a first sampling rate defining the resolution. The digital data are read into successive cells of an accident memory which has a substantially smaller storage capacity than the data memory at a rate substantially higher than the first sampling rate corresponding to regular intervals of distance traveled. Thereafter, the maximum and minimum values of the velocity and the value of the distance during each of the predetermined regular periods are determined. In the step of reading into the data memory, at least the minimum and maximum values of the velocity data and the distance value are stored. The contents of the accident memory are shifted forward at the rate corresponding to the regular intervals of distance traveled and the contents of the data memory are shifted at the first sampling rate.

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