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Version Superseded: 01/07/2013
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Textual Amendments
a F Mnd and F MD : in case of two-axled motor vehicles: these symbols may be simplified to corresponding F i symbols.] | |
Symbol | Notes |
---|---|
E | wheelbase |
E R | distance between king-pin and centre of axle of semi-trailer (or distance between drawbar coupling and centre of axle or axles of centre-axle trailer) |
ε | the adhesion utilised by the vehicle: quotient of the maximum braking rate with the anti-lock braking system operative (z AL ) and the coefficient of adhesion (k) |
ε i | the ε-value measured on axle i (in the case of a motor vehicle with a category 3 anti-lock system) |
ε Η | the ε-value on the high-friction surface |
ε L | the ε-value on the low-friction surface |
F | force [N] |
F bR | braking force of the trailer with the anti-lock braking system inoperative |
F bRmax | maximum value of F bR |
F bRmax,i | value of F bRmax with only axle i of the trailer braked |
F bRAL | braking force of the trailer with the anti-lock braking system operative |
F Cnd | total normal reaction of road surface on the unbraked and non-driven axles of the vehicle combination under static conditions |
F Cd | total normal reaction of road surface on the unbraked and driven axles of the vehicle combination under static conditions |
F dyn | normal reaction of road under dynamic conditions with the anti-lock braking system operative |
F idyn | F dyn on axle i in case of motor vehicles or full trailers |
F i | normal reaction of road surface on axle i under static conditions |
F M | total normal static reaction of road surface on all wheels of motor (towing) vehicle |
F Mnd a | total normal static reaction of road surface on the unbraked and non-driven axles of the motor vehicle |
F Md a | total normal static reaction of road surface on the unbraked and driven axles of the motor vehicle |
F R | total normal static reaction of road surface on all wheels of trailer |
F Rdyn | total normal dynamic reaction of road surface on the axle(s) of semi-trailer or centre-axle trailer |
F wM a | 0,01 F Mnd + 0,015 F Md |
g | acceleration due to gravity (9,81 m/s 2 ) |
h | height of centre of gravity specified by the manufacturer and agreed by the technical service conducting the approval test |
h D | height of drawbar (hinge point on trailer) |
h K | height of fifth wheel coupling (king pin) |
h R | height of centre of gravity of the trailer |
k | coefficient of adhesion between tyre and road |
k f | k-factor of one front axle |
k H | k-value determined on the high-friction surface |
k i | k-value determined on axle i for a vehicle with a category 3 anti-lock braking system |
k L | k-value determined on the low-friction surface |
k lock | value of adhesion for 100 % slip |
k M | k-factor of the motor vehicle |
k peak | maximum value of the curve ‘ adhesion versus slip ’ |
k r | k-factor of one rear axle |
k R | k-factor of the trailer |
P | mass of individual vehicle [kg] |
R | ratio of k peak to k lock |
t | time interval [s] |
t m | mean value of t |
t min | minimum value of t |
z | braking rate |
z AL | braking rate z of the vehicle with the anti-lock braking system operative |
z C | braking rate z of the vehicle combination, with the trailer only braked and the anti-lock braking system inoperative |
z CAL | braking rate z of the vehicle combination, with the trailer only braked and the anti-lock braking system operative |
z Cmax | maximum value of z C |
z Cmax,i | maximum value of z C , with only axle i of the trailer braked |
z m | mean braking rate |
z max | maximum value of z |
z MALS | z AL of the motor vehicle on a ‘split surface’ |
z R | braking rate z of the trailer with the anti-lock braking system inoperative |
z RAL | z AL of the trailer obtained by braking all the axles, the towing vehicle unbraked and its engine disconnected |
z RALH | z RAL on the surface with the high coefficient of adhesion |
z RALL | z RAL on the surface with the low coefficient of adhesion |
z RALS | z RAL on the split surface |
z RH | z R on the surface with the high coefficient of adhesion |
z RL | z R on the surface with the low coefficient of adhesion |
z RHmax | maximum value of z RH |
z RLmax | maximum value of z RL |
z Rmax | maximum value of z R |
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