BS ISO 06855-1:2012 pdf download

BS ISO 06855-1:2012 pdf download.Mopeds -Measurement method for gaseous exhaust emissions and fuel consumption Part 1: General test requirements.
As far as possible, the air speed shall be constant across the whole outlet section.
The blower outlet shall have a cross-section area of at least 0,2 m2 and the bottom of the blower outlet shall be between 5 cm and 20 cm above floor level. The blower outlet shall be perpendicular to the longitudinal axis of the moped between 30 cm and 45 cm in Front of Its front wheel. The device used to measure the linear velocity of the air shall be located at between 0cm and 20cm from the air outlet.
7.5 Fuel consumption measurement
7.5.1 One of the following methods shall be used to measure the fuel consumption, depending on the characteristics of each method and on the type of test to be performed (conventional test cycle or constant speed):
a) carbon balance method;
b) volu metric method;
c) gravimerric method;
d) flowmeter method.
The carbon balance method shall be applied in accordance with 12.1.
Other methods may be used if it can be proved that the results given are equivalent.
7.5.2 Fuel shall be supplied to the engine by a device capable of measuring the quantity of fuel supplied with an accuracy oft 2 % in accordance with Annex A. and which does not interfere with the supply of fuel to the engine. When the measuring system is volumetric, the temperature of the fuel in the device or in the device outlet shall be measured.
Switching from the normal supply system to the measuring supply system shall be done by a valve system and shall take no more than 0,2 s.
7.5.3 Annex A gives the description and the methods of use of the appropriate devices for fuel flow measurement.
7.6 Accuracy of instruments and measurements
7.6.1 The distance travelled by the moped shall be measured with an accuracy oft 1 %.
7.6.2 The speed of the moped shall be measured with an accuracy oft 1 % to the resolution of 0.1 km/h. For speeds less than 10 km/h, the speed shall be measured to the resolution of 0,1 km/h.
7.6.3 The ambient temperatures and the temperatures considered in 7.2.3 and 7.2.6 shall be measured with an accuracy oft 2 IC
7.6.4 The atmospheric pressure shall be measured with an accuracy oft 0,2 kPa.
7.6.5 The relative humidity of the ambient air shall be measured with an accuracy oft S%.
7.6.6 The pressures considered en 7.2.7 shall be measured with an accuracy ott 0,4 kPa.
7.6.7 The analysers shall have a measuring range compatible with the accuracy required to measure the content of the various pollutants and carbon dioxide with an accuracy oft 1 %. regardless of the accuracy ol the calibration gases. The overall response time of the analysing circuit shall be less than 1 min.
7.6.8 The cooling air speed shall be measured with an accuracy oft 5 km/h.
7.6.9 The duration of cycles and gas collection shall he conducted with an accuracy oft 1 s. These times shall be measured with an accuracy of 0,1 s.
7.6.10 The total volume of the diluted exhaust mixture shall be measured with an accuracy of ± 3 %.
7.6.11 The total flow rate and the sampling flow rates shall be steady with an accuracy oft 5%.
7.6.12 The wind speed on the test road shall be measured with an accuracy of i 5% to the resolution of
0.1 rn/s.
8 Preparing the test
8.1 Engine fuel and lubricants
The test fuel shall be selected in accordance with the manufacturer’s requirements and the specification of test fuel shall be reported. An example of the record form is given in Annex H.
With regard to grade and quantity ofoil, the lubrication ofthe engine shall complywith the manufacturer’s recommendation.
8.2 DescrIption of the test moped
The main specifications of the moped shall be provided in accordance with ISO 6855-2:2012, Annexes A and B and with ISO 6855-3:2012, Annex B.
8.3 CondItIonIng/preparatIon of the test moped
8.3.1 Theengine,transmissionandmopedshallberuninproperlyinaccordancewiththemanufacturer’s requirements.
8.3.2 The moped shall be adjusted in accordance with the manufacturer’s requirements (e.g. the viscosity of the oils, tyre pressures) or, if there is any alteration, the full description shall be given in the test report.
8.3.3 The distribution of the load between the wheels shall be in conformity with the manufacturer’s instructions.
8.4 Adjustment of the analytical apparatus
8.4.1 Calibration of the analysers
The calibration gas at the indicated pressure, compatible with the correct functioning of the equipment, shall he passed through the analyser.
The curve of the analyser’s deviations shall be drawn as a function of the contents of the various gas cylinders used.