Simulation of Automobile Brake Wear Dynamics and Estimation of Emissions 831036
Asbestos emissions from automobile brakes were measured under conditions simulating downtown city driving. Reference data for city driving was obtained by measuring vehicle speed, time of brake application, cool-down time between applications, brake hydraulic-line pressure and pad temperature. Data from 1800 braking applications were then analyzed to provide a statistical distribution of representative braking cycles.
We constructed a computer-controlled brake emission test rig that simulated road braking operation of a front wheel disc brake and collected airborne wear debris. Representative braking cycles were programmed on this system to experimentally estimate brake emissions under a variety of braking conditions.
Realistic braking operations produced particle and asbestos emission rates in close agreement with those measured by Williams and Muhlbaier. Asbestos concentration was not correlated with mechanical work done in braking.
Application of the asbestos emission rates to air quality models confirmed Williams and Muhlbaier's finding that about 1% of asbestos fibers in city core districts originated from disc brake wear.
Citation: Cha, S., Carter, P., and Bradow, R., "Simulation of Automobile Brake Wear Dynamics and Estimation of Emissions," SAE Technical Paper 831036, 1983, https://doi.org/10.4271/831036. Download Citation
Author(s):
Soyoung Cha, Philip Carter, Ronald L. Bradow
Affiliated:
Northrop Services, Inc. Research Triangle Park, NC
Pages: 24
Event:
Passenger Car Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Air pollution
Disc brakes
Test facilities
Environmental testing
Emissions certification
Emissions
Wear
Particulate matter (PM)
Statistical analysis
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