Method for storing run data of a vehicle in the memory of an ele

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36442403, 377 16, 377 26, G06F 1300





The invention relates to a method for storing run data of a vechicle in the memory of an electronic tachograph and displaying these data with a predetermined resolution, in which the movement of the vehicle is sensed by means of a road sensor, digital ddistance and velocity data are provided from the sensed signals proportional to the advance of the vehicle and the momentary velocity, respectively and these digital data are read in subsequent cells of a data memory of the tachograph in predetermined regular periods.
The invention relates also to an apparatus for carrying out the method which comprises an input block with inputs coupled to pulse lines of a road sensor and to a static signal line, the input block comprising signal forming circuits, a pulse generator and a frequency meter with first input connected to the pulse generator and second input connected to the signal forming circuits associated with the pulse lines, a microcomputer connected to the output of the input block and a memory unit coupled to the microcomputer.
In our Hugarian patent published on Aug. 28, 1986 and having the application number 4841/84 entitled "electronic tachograph" the conditions for the reliable implementation of an electronic tachograph were discussed, including the protection of the memory against disturbances in the power supply and against any possible erroneous processor operation. The patent dealt also with the reading of the stored data by means of light emitting diodes and with the questions of identification. These aspects are important for the implementation of the tachograph function, but it has also a similarly high significance how the large amount of information should be stored to provide an optimum utilization of the memory. The sparing with the available memory capacity forms not only an economic question, but the amount of information that can be stored defines the length of operation of the tachograph without the risk of data losses and without the need for reading out the stored data. Nowadays the storage of data for one or two weeks of running time forms a general requirement.
Although a number of sampling and data compression methods are known, the analysis thereof has shown that most of them are connected with problems when applied for the realization of a tachograph function.
In a known way of compressed data storage only changes in the sensed variable are recorded together with the associated time data. This method enables a compressed data recording if the sensed process is sufficiently slow. In vehicles, however, this condition cannot be met because the speed of the vehicle can vary within wide limits . Therefore such a method cannot be used. The generally accepted sampling technique should take into account the frequent changes in the velocity. Therefore the true reproduction of the velocity-time curve would require a very frequent sampling and the storage of the sampled data. The storage of such an amount of information would be rather redundant.
In the case of using a delta code modulation each sampling would be associated with 1 of information only, which means a decreased amount of information to be stored. From these information the changes in the vehicle speed can be reconstructed. The problem lies here also in the required high number of sampling points, since the speed of the vehicle can be changed in 10 to 20 seconds even up to 60 km/hr. Therefore the signal reproduction would require a sampling in every 1 or 2 seconds. In view of the full operational period of about two weeks such a sampling would still require a considerably high storage capacity.
In addition to the appropriate data storage a further problem is connected with the reading out of this information. In a number of conventional data recording equipment the data carrier which stores the information (casette or memory) is removed and transported to a central location for reading out the stored information. If the data carrier is damaged during the transport, the important information can be lost. A further problem arises

patent: 4533962 (1985-08-01), Decker et al.
patent: 4575454 (1988-07-01), Hisatake et al.
patent: 4638289 (1987-01-01), Zottnik
patent: 4817118 (1989-03-01), Wilburn et al.
patent: 4853859 (1989-08-01), Morita et al.
patent: 4866616 (1989-09-01), Takeuchi et al.


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