Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p47
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 47/57)
Character Range: 222391–225425

OVC-HEVs, if the minimum requirement of 50 per cent between  and  is not met, the upper positive tolerance  may be increased by steps of 1 per cent until the 50% target is reached. When using this mechanism, the value of  shall never exceed 50 per cent.

Annex 9

Assessment of excess or absence of trip dynamics
              1. Introduction

              This annex describes the calculation procedures to verify the trip dynamics by determining the excess or absence of dynamics during an RDE trip.

              2. Symbols, Parameters and Units

a          —  acceleration [m/s2]
ai         —  acceleration in time step i [m/s2]
apos       —  positive acceleration greater than 0.1 m/s2 [m/s2]
apos,i,k   —  positive acceleration greater than 0.1 m/s2 in time step i considering the urban, rural and motorway/expressway shares [m/s2]
ares       —  acceleration resolution [m/s2]
di         —  distance covered in time step i [m]
di,k       —  distance covered in time step i considering the urban, rural and motorway/expressway shares [m]
Index (i)  —  discrete time step
Index (j)  —  discrete time step of positive acceleration datasets
Index (k)  —  refers to the respective category (t=total, u=urban, r=rural, m=motorway, e=expressway)
Mk         —  number of samples for urban, rural and motorway/expressway shares with positive acceleration greater than 0.1 m/s2
Nk         —  total number of samples for the urban, rural and motorway/expressway shares and the complete trip
RPAk       —  relative positive acceleration for urban, rural and motorway/expressway shares [m/s2 or kWs/(kg*km)]
tk         —  duration of the urban, rural and motorway/expressway shares and the complete trip [s]
           —  vehicle speed [km/h]
           —  actual vehicle speed in time step i [km/h]
           —  actual vehicle speed in time step i considering the urban, rural and motorway/expressway shares [km/h]
           —  actual vehicle speed per acceleration in time step i [m2/s3 or W/kg]
           —  actual vehicle speed per positive acceleration greater than 0.1 m/s2 in time step j considering the urban, rural and motorway/expressway shares [m2/s3 or W/kg].
           —  95th percentile of the product of vehicle speed per positive acceleration greater than 0.1 m/s2 for urban, rural and motorway/expressway shares [m2/s3 or W/kg]
           —  average vehicle speed for urban, rural and motorway/expressway shares [km/h]

3. Trip indicators
              3.1. Calculations

              3.1.1. Data pre-processing

              Dynamic parameters, such as acceleration, (v × apos)  or RPA, shall be determined with a speed signal of an accuracy of 0.1 per cent for all speed values above 3 km/h and a sampling frequency of 1 Hz. Otherwise, acceleration shall be determined with an accuracy of 0.01 m/s2 and a sampling frequency of 1 Hz. In this case, a separate speed signal is required for  and shall have an accuracy of at least 0.1 km/h. The speed trace shall form the basis for further calculations and binning as