On-Board Monitoring (OBM) for EU7 – Challenges and possible approaches

Along with the ongoing discussion to define a future EU7 emission legislation, the idea of so-called On-Board Monitoring (OBM) was highlighted as well. OBM will be designed to ensure that vehicle emission limits will not be exceeded over lifetime. This will require monitoring of tailpipe emissions in the vehicle by using emissions sensors and model-based emission prediction. Targets coming along with tailpipe emissions monitoring will be a timely detection of high emitting vehicles and enforcement to repair these vehicles to minimize on road emissions. Technically, such an OBM introduction needs to be prepared well and high development efforts for hardware, emission modelling and engine control software are expected. Sensor values as well as the emission behavior of vehicles underlie certain tolerances which need to be identified and considered for a justified and reliable detection of high emitting vehicles. The combination of sensor information as well as predicted tailpipe emissions from ECU internal models and statistical data will be required to fulfill future OBM requirements. The results of conducted hardware investigations and advanced Raw and Tailpipe emission modelling are key elements for a future realization of OBM.