STOP DISTANCE ESTIMATION SYSTEM AND METHOD FOR CALCULATING AND ESTIMATING STOP DISTANCE BY USE OF STOP DISTANCE ESTIMATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a stop distance estimation system and method, allowing calculation of a stop distance with high accuracy.;SOLUTION: In this stop distance estimation system, a control part 20 includes: an initial speed setting means 203 setting an initial speed; a correction means 204 correcting expression 1 of v=v₀-μgt+μgτ(1-e^-t/τ) based on an error between a deceleration measurement speed and a calculation speed; a determination means 205 determining a deceleration degree and a time constant based on a difference between a measurement acceleration and a calculation acceleration; a stop time calculation means 206 calculating a stop time by use of the corrected expression, the initial speed, the deceleration degree, and the time constant; and a stop distance calculation means 207 calculating the stop distance by expression 2 of d_s=v₀t_s-μgt_s²/2+μgτ{t_s-τ(1-e^-ts/τ)}. In the expression 1, v is the calculation speed; v₀ is the initial speed; μg is the deceleration degree; t is a deceleration time that is a time lapsed with a deceleration start time as a reference; and τ is the time constant. In the expression 2, d_s is the stop distance; and t_s is the stop time.;COPYRIGHT: (C)2010,JPO&INPIT