Method for storing run data of a vehicle in the memory of an electronic tachograph and apparatus for carrying out the method
First Claim
1. A method for storing run data of a vehicle in a data memory of an electronic tachograph and displaying said run data with a predetermined resolution, comprising 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, reading said digital data into successive cells of said data memory (32) of the tachograph in predetermined regular periods corresponding to a first sampling rate defining said resolution, wherein said digital data are read into successive cells of an accident memory (31) which has a substantially smaller storage capacity than said data memory (32) at a rate substantially higher than said first sampling rate corresponding to regular intervals of distance traveled, determining the maximum and minimum values of the velocity and the value of said distance during each of said predetermined regular periods, and in said step of reading into the data memory (32) at least said minimum and maximum values of the velocity data and the distance value are stored, shifting forward the contents of the accident memory (31) at said rate corresponding to said regular intervals of distance traveled and shifting forward the content of the data memory (32) at said first sampling rate.
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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.
112 Citations
7 Claims
- 1. A method for storing run data of a vehicle in a data memory of an electronic tachograph and displaying said run data with a predetermined resolution, comprising 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, reading said digital data into successive cells of said data memory (32) of the tachograph in predetermined regular periods corresponding to a first sampling rate defining said resolution, wherein said digital data are read into successive cells of an accident memory (31) which has a substantially smaller storage capacity than said data memory (32) at a rate substantially higher than said first sampling rate corresponding to regular intervals of distance traveled, determining the maximum and minimum values of the velocity and the value of said distance during each of said predetermined regular periods, and in said step of reading into the data memory (32) at least said minimum and maximum values of the velocity data and the distance value are stored, shifting forward the contents of the accident memory (31) at said rate corresponding to said regular intervals of distance traveled and shifting forward the content of the data memory (32) at said first sampling rate.
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6. An apparatus for storing travel data of a vehicle in the a memory of an electronic tachograph and displaying said travel data with a predetermined resolution, comprising an input block (12) having inputs coupled to pulse lines (10) of a road sensor (11), the input block (12) comprising signal forming circuits (13, 16), a pulse generator (14) and a frequency meter (15) with a first input connected to the pulse generator (14) and a second input connected to the signal forming circuits (13) associated with the pulse lines (10), a microcomputer (20) connected to the output of the input block (12) and a memory unit (30) coupled to the microcomputer (20), wherein the memory unit (30) comprises an accident memory (31) with address lines (34) and a data bus (35) coupled to a memory address controller (22) associated with the microcomputer (20), a data memory (32) with a data bus (36) and an address bus (37) coupled to a data compressor and memory controller (23) within the microcomputer (20) and the microcomputer (20) comprises a clock generator (24) and an input data register (21) said accident memory receiving from said input data register and storing information comprising a predetermined number of the most recent samples of instantaneous travel data output by said frequency meter in response to signals from said pulse generator based on measurements made by said road sensor, said instantaneous samples being taken at regular intervals of distance traveled corresponding to a first sampling rate and being stored at addresses determined by said address controller;
- and said data memory receiving from said data compressor and memory controller and storing information comprising samples of processed travel data formed by compressing said instantaneous travel data, said processed samples being taken at regular intervals of time determined by said clock generator corresponding to a rate substantially lower than said first sampling rate.
- View Dependent Claims (7)
Specification