ISO 6855-2:2012 pdf download – Mopeds – Measurement method forgaseous exhaust emissions and fuel consumption – Part 2: Test cycles and specific test conditions. Starting up the engine Once the preliminary operations on the equipment [or collecting, diluting, analysing and measuring the gases have been carried out, the engine is started up by means of the devices provided for that purpose, such as the choke, the starter valve, etc.. according to the manufacturer’s instructions. The first cycle begins when the taking of samples and the measuring of the pump rotations commence. Use of the manual choke
The choke shall be cut out as soon as possible and in principle before acceleration from 0 to 50 km/h. II this requirement cannot be met, the moment of actual cut-out shall be indicated. The choke shall be adjusted In accordance with the manufacturer’s instructions. Idling Manual-shift gearbox During periods of idling the clutch shall he engaged and the gears in neutral. To enable the accelerations to be performed according to the normal cycle, the vehicle shall be put in first gear, with the clutch dIsengaged. 5 s before commencement of the acceleration following the idling period in question. The first idling period at the beginning of the cycle consists o16 s of idling in neutral with the clutch engaged and S s in first gear with the clutch disengaged. For the idling periods during each cycle, the corresponding times are 16s in neutral and 5 s in first gear with the clutch disengaged. The last idling period in the cycle consists of 7 s in neutral with the clutch engaged. SemI-automatic gearboxes
The manufacturer’s instructions for driving in town or, in their absence, instructions applicable to manual gearboxes, shall be followed. Automatic gearboxes
The selector shall not be operated at any time during the test unless the manufacturer specifies otherwise. In the latter case, the procedure for manual gearboxes applies. Accelerations Accelerations shall be effected so as to ensure that the rate of acceleration is as constant as possible throughout the operation. lIthe acceleration capacities of the moped are not sufficient to perform the acceleration cycles within the prescribed tolerances, the moped shall be driven with the throttle completely open until the speed prescribed for the cycle has been reached. The cycle may then continue normally. Decelerations All decelerations shall be effected by completely closing the throttle, the clutch remaining engaged. The engine shall be disengaged at a speed of 10 km/h If the period of deceleration is longer than that prescribed for the corresponding phase, the vehicle’s brakes are used to keep to the cyde. II the period of deceleration Is shorter than that prescribed for the corresponding phase, the timing of the theoretical cycle is restored by a steady-state or an idling period merging into the following steady-state or idling operation. In this case, is not applicable. At the end of the deceleration period (stopping moped on the rollers), the gear shall he put Into neutral and the clutch engaged. Constant speeds “Pumping or the closing u[the throttle shall be avoided when passing from acceleration to the following steady speed. Periods of constant speed shall be achieved by keeping the accelerator position tixed.
3.2.3 Analysis
The exhaust gases contained in the bag shall be analysed as soon as possible and in any event not later than 20 mm after the end of the test cycle.
3.2.4 Operating cycle
The operating cycle on the dynamometer is as indicated in Table 1 and plotted in Figure 1.