Innovative brake testing for Life NEEVE

As part of the LIFE NEEVE project HORIBA characterized sets of brake discs and pads according to GTR 24 on a brake dynamometer in its Brake Test Center in Flörsheim and on a Chassi dynamometer in its location in Oberursel (as seen in the picture above)

Innovative testing concept

Afterwards the components were mounted into a self-designed housing capable of providing a HEPA filtered airstream to cool the brakes and to carry emitted particles to particle mass and number measuring instrumentation.

This concept provides the advantage of being transferable to a vehicle and allowing to mount the very same brake components on the designated vehicle on a chassis dynamometer where Trip #10 of the brake test cycle then can be repeated multiple times with a focus on repeatability of the measurements and the correlation of 6 different PN and two PM measurement instruments with various operation principles.

Additionally a similar repeatability was achieved on the brake and chassis dynamometers, which were supported by a driving robot during the test scenarios with more than 20 repetitions on both dynamometers.

Results and correlation

Another finding was that by comparing CPC-based particle counting systems for laboratory and mobile applications to particle sizers based on electrical mobility and aerodynamic classification a very strong correlation for the tested cycles and agreement in terms of particle emission per kilometre have been shown, making the HORIBA OBS ONE PN10 and OBS ONE PM which have been used for the respective tests, good choices for the onboard non-exhaust emission measurements envisaged in the project Life-NEEVE.