VZM 300
Operation
3.14
D1 2010BA0-GB03
Trailer Deceleration
(
) (
)
a
a
a
m
m
m
a
trailer
tractor
roll
tractor
trailer
trailer
roll
=
−
×
+
+
a
roll
= 0.5 m/s
2
rolling resistance (variable setting)
a
trailer
= trailer deceleration [m/s
2
]
a
tractor
= tractor deceleration [m/s
2
]
m
tractor
= tractor weight [t]
m
trailer
= trailer weight [t]
a
tractor
is used for the calculation of the average brake deceleration, the maximum brake
deceleration and the trailer brake deceleration (ISO).
Average Deceleration according to ISO/DTR 13487F
ISO:
(
)
a
a
a
t
t
a
a
t
a
a
t
a
a
t
msN
i
i
i B
E
E
B
i
i
j
j
i
i
i B
E
j B
i
i B
E
i B
E
=
+
−
×
+
× −
+
×
+
+
×
−
= +
−
−
−
= +
= +
= +
= +
∑
∑
∑
∑
∑
1
2
2
2
2
4
1
1
2
1
1
2
1
2
1
1
1
1
∆
∆
∆
ISOab:
a
a
a
mt
E
B
=
+
2
a
mt
: deceleration according to ISO by averaging of two acceleration values (issued as ISOab on
the VZM 300)
a
E
: acceleration at time t
end
(a
max
/2) – t
E
a
B
: acceleration at time t
start
(a
max
/2) + t
B
t
E
: end time of measurement
t
B
: start time of measurement
