Tachograph Chart - Analysis of Intensive Braking Recording

The article presents problems in determining intensive braking parameters from the tachograph chart recordings. A number of braking trials were recorded by a tachograph and a decelerometer simultaneously. Next a comparative analysis of the recordings was performed using both the Siemens VDO method and by electronic processing with commonly available equipment. The first method proved to have limited possibilities for interpretation of the recordings for quantitative determination of intensive braking parameters. The second proved unreliable (with the existing scanner resolution). It has been shown that it is not possible to determine unequivocally the braking time, and consequently the deceleration reached.