Measuring vehicle travel resistance using rolling to stop analytical method with equation

摘要

The distance-time data can be used at specified points, at which the vehicle undergoes a rolling on movement, instead of such an occurrence, which obtains at a point, at which the vehicle is held completely at a stop S(Ti) = delta/gc(In cos(tan-1 (h/B) + BTr)-hTi)/cos(tan-1(h/B) + B(Tr+Ti) T1 is the time, which the vehicle needs to arrive at a test distance between the start measuring point to the end measuring point on a test distance. Tr is the time, which the vehicle needs from the end measuring point, to come to a complete stop. h = (gb)/2 delta, B = (gA/2 delta, A = square root(4ac-b2) delta = 1+f = 1nIw + Id)g/WR2. a = tauo + fo, c = k + (rhoCdf)/(2gW). To is the constant term of the transmission loss, b is the coefficient of the transmission loss proportional to the vehicle speed. fo is the constant term of the resistance to the roll, n is the total number of tyres. K is the coefficient of the roll resistance proportional to the square of the vehicle speed. IW is the moment of inertia of one tyre. Id is the moment of inertia of the transmission exclusive of the tyres. R is the dynamic radius of the tyres. W is the vehicle wt. V speed, F is vehicle front, e is the air density, Cd the air resistance and g is the acceleration due to gravity.