IS 15543: Selection of prime movers for trailers - Guidelines

2005·1 MB·English

by  Bureau of Indian Standards

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IS 15543 (2005): Selection of prime movers for trailers -
Guidelines [TED 22: Transport Tractors and Trailers]
“!ान $ एक न’ भारत का +नम-ण”
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IS 15543:2005

Indian Standard
SELECTION OF PRIME MOVERS FOR
TRAILERS — GUIDELINES
ICS43.080.10

CJBIS2005
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
January 2005 Price Group 2
. ...
Transport Tractors, Trailers and Industrial Trucks Sectional Committee, TED 22
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Transport
Tractors, Trailers and Industrial Trucks Sectional Committee had been approved bythe Transport Engineering
Division Council.
The prime mover, that is,tractor isselected primarily onthe basis oftotal draw bar pull requirements.
Inthis standard S1units have been used, the unit of force inNewton (N), of‘iyreload inkilogram (kg) and of
pressure inpascal (Pa). Their relationships are given below for information:
1kgf = 9.80665 N (exactly)
= 9.81 N (approx)
= 10N (within 2percent error)
1kPa = 0.01 kgf/cm2(within 2percent error) .-
1kgf/cm2 = 98.066 kPa.
NOTE — Values of 1kPa rounded to the nearest practical unit.
The composition ofthe Committee responsible for formulation ofthis standard isgiven atAnnex A.
For the purpose of deciding whether aparticular requirement ofthis standard iscomplied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
IS2:1960 ‘Rules forrounding offnumerical values(revised)’. Thenumber ofsignificant places retained inthe
rounded off value should be the same asthat ofthe specified value inthis standard.

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IS 15543:2005
Indian Standard
SELECTION OF PRIME MOVERS FOR
TRAILERS — GUIDELINES
1SCOPE 4ASSUMPTIONS
1.1 This standard lays down procedure for selection For the purpose of ease in calculations, following
of prime movers for semi-trailers. assumptions have been made:
1.2Theproceduregiveninthisstandardcanalsobeused a) Mechanical eftlciency for = 0.85
forfulltrailerswiththedeletionoffifihwheelloading. transmissions
b) Rolling resistance = 30kgflt
2 REFERENCE
= 0.03 percent
The following standard contains provisions, which
c) Maximumgradientavailable = 1in 10(5.7°)
through reference inthis text, constitute provisions of
onroads
this standard. At the time of publication the editions
d) Equivalent mass of tractor =3.0 x W3kgf
indicated was valid. All standards are subject to
while accelerating in lowest
revision and parties to agreements based on this
gear
standard are encouraged to investigate the possibility
e) Initialacceleration oftractor = 0.4 m/s2
of applying the most recent editions of the standard
trailer combination
indicated below:
o Accelerationduetogravi~, g = 9.81 m/s2
IS No. Title
11852(Part 9): Automotive vehicles — Brakes and
2003 brakingsystems:Part 9Requirements 5SELECTION BASEDONTOTAL RESISTANCE
for vehicles equipped with anti-lock TO MOTION
braking systems
As a worst condition, it is assumed that the tractor-
trailer combination is required to overcome all the
3 NOTATIONS USED
resistances, that ‘is Rolling resistance, Gradient
Following notations have been used inthis standard: resistance and Inertial resistance simultaneously. The
a) Tractor unladen weight, k g f = W, airresistance isneglected asinitial speed ofvehicle is
b) Fifthwheel loading,kgf = W* zero.
c) GVWoftractor, kgf =W, +W2=W Total resistance = T,
3
d) GVWoftrailer, kgf = w, . Rolling resistance + Gradient resistance +
e) Towedweight oftrailer, kgf = W,– W, =W, Inertial resistance
f) Engine torque, Nm =T, . Rr+Rg+Ri
g) Overall gearreduction ratio = G1 . 0.030 x (W, + W,) x 9.81 +0.1 x (W, + W5)
(Lowest gear)
X9.81 +(3 XWj+WJX0.4N
h) Overall gear reduction ratio = G* . 0.2943 x (W, + WJ+ 0.981 x (W3 + W,)
(Top gear)
+1.2 W3+0.4 W~
j) Tyre rolling radius, m =r +1.275 3 X(W3+ W$)+ 1.2 WJ+0.4 W~
k) Total resistance to motion, N = ~ . 2.4753 W,+ 1.6753 W, N
m) Tractive effort atwheels in = Tw, . 2.47 W,+ 1.67 W, N
lowestgear,N
n) Tractive effort atwheels in = Tw, Tractive effort at ~xG, x0.85=T N
top gear,N wheels inlowest gear =
r WI
P) Rolling resistance, N = R, The tractor under consideration will qualify for
@ Gradient resistance, N =R selection if,
r) Inertial resistance, N = R;
TW>, T,
s) Maximum vehicle speed, m/s = V

1
-m ..., ...
T
“,
IS 15543:2005
8 SELECTION BASED ON MAXIMUM SPEED
~ XGIxO.85
that is >2.47 W~+1.67 B’s ON PLAIN ROAD IN TOP GEAR
r
P = power of engine, kW
6 SELECTION BASED ON ROAD ADHESION
0.85 =transmission efficiency
Maximum traction generated due to road adhesion R, =rolling resistance, N
=GVWoftractor x Acceleration duetogravity x Co- V = maximum vehicle speed= 14m/s say for
efficient of adhesion
example (50 kmlh)
= WjX 9.81 X ().8N 1000x Px0.85=R, XV
7.848 x W, N ‘0.03 x (W, + W,) x 9.81 x 14
=
=4.1202 (W3+ w,)
This should begreater than T,toachieve mobility (the
inspection oftherelationships given in5and6)above Power of vehicle engine should be:
reveals that the trailer weight should not exceed the
tractor weight by3times. Thiscanbetakenasathumb 4.1202 (W3+W,)
rule that is3 x W3= W5. P= 0.85 X1000
7 SELECTION BASED ON PLAIN ROAD =0.004847 (W3+ WJ kW
APPLICATION IN TOP GEAR
=0.005 (W3+ WJ kW for 50knvh
In this condition, the tractor-trailer combination is
or= 0.0025 (W3+ WJ kW for 25 krnih
required to overcome only rolling resistance in top
gear, effect of air resistance may be considered, if However, this speed should be achievable at wheels
appreciable. However, the rolling resistance will be considering the engine speed, transmission ratio and
around 0.02 per cent on tarmac road and considering rolling radius.
airresistance thetotal resistance maybeconsidered as
9SELECTION BASEDONTHE COMPATIBILITY
0.03 per cent.
FOR THE PRIME MOVER ANDTHE TRAILER
Tractive effort at
wheels intop gear =~ xG, X0.85 =TWZN The compatibili~ requirements ofthe tractor and the
r trailer shallbe inaccordance with IS 11852(Part 9).
Twz>Rolling resistance
10TEST RESULTS
~ X~z xO.85
>0.03X(WJ +FV~)X9.81 The test results of the verifications done for all the
r
>0.2943 (W3+W~) parameters specifiedinthisstandard shallbeproduced

>0.3 (W3+W 5) inthe form oftest report.

2
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IS 15543:2005
ANNEX A
(Foreword)
COMMITTEE COMPOSITION
Transport Tractors, Trailers and Industrial Trucks Sectional Committee, TED 22
Organization Representative(s)
P. L. Haulwel Ltd, Chennai SHIUS. RAMSUBRAMANIA(NChairman)
SHFUB. RAMESH(Alternate)
Ashok Leyland Ltd, Chennai SHRIP. DHANASEKARN
sHRsr.
Automotive Research Association of Indi% Pune RAHJ
Smu A. AKBARBADUSHA(Alternate)
Bharat Earth Movers Ltd, Bangalore SHRIM. P. SRSRAM
Smu T. SIURAM(Alternate)
Brakes India Ltd, Chennai SHRIK. N. BALAII
Smu K. KANNABIWN(Alternate)
Central Institute of Road Transport, Pune SHRIV. R. JALGAONKAR
SHSUD. G. SHUWE(Alternate)
Controllerate of Quality Assurance Vehicle, Ministry of Defence, Smu S. K. CHAKRABORTY
Ahmednagar
Directorate General of Quality Assurance (DGQE), Ministry of COLR. Puru
Defence, New Delhl LTCOLB. T. JADE(Alternate)
Directorate of Standardization, New Delhi CoL G. P. I@sHNAM~THY
Indian Federation of Transport Operators, Mumbai SHIUTILAKCHANDMANGATRAMOBHAN
Smu HARKIRATSINGHKHOU(Alternate)
Indian Tyre Technical Advisory Committee, New Delhi StrruV. ABRAHAM
Smr T. FALCAO(Alternate)
Ministry of Surface Transport (Roads Wing), New Delhi SHRINIRMALJITSINGH
Ministry of Surtace Transport (Development Wing), New Delhi Strru G. P. ROY
SmuT. K. DIJ’ITA(Alternate)
Tata Motors Ltd, Pune SHRIB. K. GHOSH
SHN S. V. KULKARNI(Alternate)

Volvo India Ltd, Bangalore SHRIV. ASHOKKUMAR

Veermata Jeejabai Technological Institute, Mumbai DR S. S. MANTHA
.Vehicle Research Development Establishment, Ahmednagar Smu P. S. DESHPANDE
SW K. KAMRAJ(Alternate)
BIS Directorate General SHMK. K. VASHWTHAD, hector and Head (TED)
[Representing Direct6r General (Ex-oL@cio)]
Member Secretary
Smu V. ARUMUGAM
Joint Director (TED), BIS

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Amend No. Date of Issue Text Affected
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