An overview of non-exhaust brake emission measuring methods

Abstract

Non‐exhaust emission is the type of particle emission that is not caused by a combustion process, but by the wear of different parts of a vehicle’s systems. One of the sources of non‐exhaust particulate emission is the braking system where the wear of friction pairs is present. There is growing number of studies that analyse brake wear with reference to the size and concentration of non‐exhaust emissions, especially PM10 and PM2.5 particles. An overview of various measuring techniques and devices for measuring the concentration of the formed particles by brake wear was performed in this paper. Pin‐on‐disc tribometers and brake inertial dynamometers are most commonly used for such tests. It is important to mention that for testing the emission of particles caused by brake wear, it is necessary to make certain modifications and design additional housings that retain the emission product. The authors have used different methods for measuring or collecting particles, which is also shown in the paper. In addition to laboratory testing methods, some authors used real vehicles whose brakes were also inserted into the housing, which prevents the entry of particles from the environment. The paper also presents a newly proposed inertia dynamometer for measuring nonexhaust particles who is development on the Faculty of Engineering.