# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 4.3.5.5: Test sequence

Extent: E+W+S+N.I.

The test sequence consists of steady state target setpoints with defined engine speed and torque at each target setpoint in accordance with paragraph 4.3.5.2 and defined ramps to move from one target setpoint to the next.
The highest target torque setpoint at each target engine speed shall be operated with maximum operator demand.
The first target setpoint is defined at the highest target engine speed setpoint and highest target torque setpoint.
The following steps shall be performed to cover all target setpoints:
(1) The engine shall be operated for 95 ± 3 seconds at each target setpoint. The first 55 ± 1 seconds at each target setpoint are considered as a stabilization period,. During the following period of 30 ± 1 seconds the engine speed mean value shall be controlled as follows:
(a) The engine speed mean value shall be held at the target engine speed setpoint within ± 1 percent of the highest target engine speed.
(b) Except for the points at full load, the engine torque mean value shall be held at the target torque setpoint within a tolerance of ± 20 Nm or ± 2 percent of the overall maximum torque, Tmax_overall, whichever is greater.
The recorded values in accordance with paragraph 4.3.5.3 shall be stored as averaged value over the period of 30 ± 1 seconds. The remaining period of 10 ± 1 seconds may be used for data post-processing and storage if necessary. During this period the engine target setpoint shall be kept.
(2) After the measurement at one target setpoint is completed, the target value for engine speed shall be kept constant within ± 20 min– 1 of the target engine speed setpoint and the target value for torque shall be decreased linearly within 20±1 seconds to match the next lower target torque setpoint. Then the measurement shall be performed according to subpoint (1).
(3) After the zero torque setpoint has been measured in subpoint (1), the target engine speed shall be decreased linearly to the next lower target engine speed setpoint while at the same time the target torque shall be increased linearly to the highest target torque setpoint at the next lower target engine speed setpoint within 20 to 46 seconds. If the next target setpoint is reached within less than 46 seconds, the remaining time up to 46 seconds shall be used for stabilization. Then the measurement shall be performed by starting the the stabilization procedure according to subpoint (1) and afterwards the target torque setpoints at constant target engine speed shall be adjusted according to subpoint (2).
Figure 3 illustrates the three different steps to be performed at each measurement setpoint for the test according to subpoint (1) above.
Figure 3
Steps to be performed at each measurement setpoint
Figure 4 exemplarily illustrates the sequence of steady state measurement setpoints to be followed for the test.
Figure 4
Sequence of steady state measurement setpoints

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/V/division/4/division/4.3/division/4.3.5/division/4.3.5.5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-V/division-4/division-4.3/division-4.3.5/division-4.3.5.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.