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Council Directive 70/220/EEC of 20 March 1970 on the approximation of the laws of the Member States relating to measures to be taken against air pollution by gases from positive-ignition engines of motor vehicles · European Union

OPERATING CYCLE ON THE DYNAMOMETER BENCH 1.1. Description of cycle The operating cycle on the dynamometer bench shall be that indicated in the following table and plotted in Appendix 1. The analysis by operations is given in Appendix 2. >PIC FILE= "T0002125"> 1.2. General conditions for carrying out the cycle Preliminary testing cycles should be carried out if necessary to determine how best to actuate the accelerator and brake controls so as to achieve a cycle approximating to the theoretical cycle within the prescribed limits. 1.3. Use of the gearbox 1.3.1. If the maximum speed which can be attained in first gear is below 15 km/h, the second, third and fourth gears shall be used. 1.3.2. Vehicles equipped with semi-automatic gearboxes shall be tested by using the ratios normally employed for driving, and the gear lever shall be operated in accordance with the manufacturer's instructions. 1.3.3. Vehicles equipped with fully automatic gearboxes shall be tested with the highest gear ("Drive") engaged. The accelerator shall be operated so as to obtain the steadiest acceleration possible, allowing the various gears to be engaged in the normal order. Furthermore, the gear-change points shown in Appendix 1 shall not apply ; acceleration shall continue throughout the period represented by the straight lines connecting the end of each period of idling with the beginning of the next period of steady speed. The tolerances given in item 1.4 shall apply. 1.3.4. Vehicles equipped with an overdrive-which can be actuated by the driver shall be tested with the overdrive out of action. 1.4. Tolerances 1.4.1. A tolerance of 1 km/h above or below the theoretical speed shall be allowed during acceleration during steady speed, and during deceleration when the vehicle's brakes are applied. If the vehicle decelerates more rapidly without the use of the brakes, only the requirements of item 5.6.3 shall apply. Speed tolerances greater than those prescribed shall be permitted during phase changes provided that the tolerances are never exceeded for more than 0.5 second on any one occasion. 1.4.2. Time tolerances of ± 0 7 5 sec. These tolerances shall apply at the beginning and at the end of each gear-changing period.(1) 1.4.3. The speed and time tolerances shall be combined as indicated in Appendix 1.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.