Effects of braking conditions on nanoparticle emissions from passenger car friction brakes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F21%3A00559337" target="_blank" >RIV/67985858:_____/21:00559337 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21220/21:00350512 RIV/60461373:22310/21:43923436 RIV/60460709:41310/21:85731 RIV/61989100:27640/21:10247503 RIV/61989100:27650/21:10247503

Result on the web

<a href="https://hdl.handle.net/11104/0332667" target="_blank" >https://hdl.handle.net/11104/0332667</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scitotenv.2021.147779" target="_blank" >10.1016/j.scitotenv.2021.147779</a>

Result language

angličtina

Original language name

Effects of braking conditions on nanoparticle emissions from passenger car friction brakes

Original language description

Automobile friction brakes generate, in addition to coarse particles generated by mechanical processes, highly variable amount of nanoparticles from high temperature processes. The effects of braking conditions – speed, deceleration rate, brake rotor temperatures – on nanoparticle production were investigated here, aiming to provide practical guidance for reducing emissions through driving style and traffic management. Typical brake pads and a rotor from a common passenger car were subjected, on a brake dynamometer, to three runs of the WLTP brake cycle developed for brake wear particle measurements. Additionally, four sets of common brake pads were subjected to those parts of standardized brake performance tests believed to be reasonably realistic for common driving. Particle size distributions (5.6–560 nm electric mobility diameter, without removal of volatiles) show a dominant peak at 10 nm commensurate to the severity of braking and a non-linear increase of the total particle number at higher braking powers and higher total energy dissipated. The average emissions for three runs of the WLTP brake cycle were 3.3 × 1010 particles/km, while the harshest deceleration, 175–100 km/h at 5.28 m·s−2, has produced 8.4 to 38 × 1013 particles, corresponding to 2.5–11.5 thousands of km of WLTP-like driving. While previous studies have correlated higher PN production with higher average brake rotor temperature, a more complex relationship between nanoparticle emissions and a combination of initial rotor temperature, total energy dissipated and braking power has been observed here. From a driver behavior and regulatory perspective, it appears limiting harsh braking and braking from high speeds, possibly through improved driving practices, road design and traffic management, may potentially reduce brake wear nanoparticles. From the measurement perspective, it appears that off-cycle braking, even if relatively infrequent, may be associated with exponentially higher emissions and non-negligible share of the total emissions, and therefore should not be neglected.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Science of the Total Environment

ISSN

0048-9697

e-ISSN

1879-1026

Volume of the periodical

788

Issue of the periodical within the volume

SEP 20

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

10

Pages from-to

147779

UT code for WoS article

000662648800007

EID of the result in the Scopus database

2-s2.0-85106349084