Study on particulate matter emission characteristics and its influencing factors of a drum brake

Abstract The particle emission characteristics of a drum brake under different braking cycles and braking conditions are studied based on the inertia test bench, brake sealing chamber, and particle test equipment. The results show that a large number of particles are generated during the braking process, and the number of solid particles at a nominal particle size of approximately 10 nm electrical mobility diameter and larger (SPN 10 ) emission factor can reach 8.927×10 9 #/km under different braking cycles. With the increase of initial braking speed, initial braking temperature, and vehicle load, the brake wear particulate generated in the braking process increases. The total brake wear particulate number emission has a quadratic function relationship with the initial braking speed and a linear relationship with the initial braking temperature. Brake deceleration has little effect on total brake wear particulate number emissions produced in one brake process.