OSEroad, the automatic generator of RDE cycles_
Assessment of polluting emissions_
The “Dieselgate” crisis has prompted the authorities to change the paradigm for the assessment of polluting emissions from internal combustion vehicles with a view to their approval. The vehicles, hitherto tested on very specific cycles on chassis dynamometers, have since 2015, with the entry into force of the Euro 6 standard (often called RDE: Real Driving Emissions), been confronted with an assessment of polluting emissions in actual traffic conditions. More specifically, pollutants are measured on open roads using portable PEMS (Portable Emission Measurement System) devices.
This represents a great challenge for car manufacturers who must control the performance of their powertrain on any compatible RDE cycle. These cycles offer a very wide variety of driving situations but they are paradoxically difficult to build in practice because they must respect a list of constraints defined by the standard (proportion of road/city/motorway, acceleration, elevation, duration and frequency of stops , etc.).
OSEroad: the first online RDE cycle generator_
OSEroad relies on a unique technology to generate RDE cycles, respecting all the criteria defined by the standard, in an efficient and reliable way, from any starting point chosen by the user. These cycles consist of both a geographic path and an associated velocity profile. Once generated, RDE cycles can easily be exported:
As speed and elevation profiles, which are the required input data from car manufacturers’ digital simulation tools,
As GPS tracks using a GPX format file, ready for road testing with PEMS.
This flexibility allows automakers to use a single tool throughout their development process, ensuring a seamless transition from digital simulation to real-world validation.
OSE has developed OSEroad, an automatic RDE cycle generator.
RDE cycle: how to reproduce real traffic conditions ?_
OSEroad is available as an online, powerful and ergonomic tool. It provides a familiar Google Maps-like interface for interactive exploration of map data and allows the user to choose the starting point for their RDE trips with just one click.
Once this point is defined, OSEroad explores the region in a systematic and efficient manner, producing a list of the most likely compatible RDE cycles from this starting point. The number of cycles found will depend on location, road layout and local topography.
Three driver models, “eco”, “normal” and “sport”, are used to drive virtually all roads in the selected region taking into account potential road events (light, stop, traffic, etc.) to produce profiles speed limits that comply with local legislation. OSEroad is available in Europe, South Korea and the United States.
OSEroad is a very effective tool for carrying out statistical studies of non-approval risk coverage or for understanding customer usage by producing speed profiles representative of real traffic conditions. This tool is used in particular in the HyMot project.
3 OSE developers mobilised
In 6 months