Working Paper

Inertia classes proposal

Historically the weight of a vehicle was represented by hanging rotating inertia mass on a dynamometer. This approach required the use of discrete inertia classes and an upper limit for inertia mass. Modern electronic dynamometers do not impose these limitations anymore. As a result it is now possible to revise existing test procedures and provide more accurate emission/fuel consumption values to consumers. This document builds on more detailed explanations that were given in the documents WLTP-DTP-LabProcICE-054 and WLTP-DTP-LabProcICE-067, and presents, for discussion, a proposal for defining inertia classes for the WLTP GTR.

This paper was submitted to the UNECE GRPE informal subgroup on the development of a worldwide harmonized light vehicles test procedure (WLTP-DTP).