Fleet Maintenance - 18

IN THE BAY

DIESEL
PARTICULATE
FILTERS:

CLEAN
OR
REPLACE?
How to know
when to service
your fleet's diesel
particulate filters,
and what options
are available
when you do.
By Emily Markham

18 Fleet Maintenance | May 2020

[ EMISSIONS & EXHAUST SYSTEMS ]
n 2007, diesel particulate filters (DPFs) were introduced to on-road
heavy duty diesel engines as a way to trap diesel particulate matter
for engine manufacturers to meet the U.S. Environmental Protection
Agency's (EPA) emissions standards. Prior to 2007, the emissions standards were set at limits of 2g/bhp-hr (grams per brake horsepower
hour) for NOx emissions and 0.1g/bhp-hr for particulate matter (PM)
emissions. Beginning with 2007 model year vehicles, a new limit of
0.01g/bhp-hr for PM emissions went into full effect, while the new limit
of 0.2g/bhp-hr for NOx emissions was phased in between 2007 and
2010. Currently, these limits remain the emissions standard requirements for diesel engines.
These standards were put in place not only for environmental protection but to protect
the public from breathing in pollutants released from diesel exhaust. According to the
EPA, the particulate matter and NOx emissions found in diesel exhaust can pose serious
public health problems. Exposure to the pollutants can cause lung damage and aggravate
existing respiratory illnesses such as asthma. DPFs help keep the environment and people
safe from these pollutants.
The DPF is a ceramic filter with thousands of micro pores, which are designed to capture
the PM and ash from the engine in order to release a less harmful exhaust from the vehicle.
To ensure this process continues to function properly, fleets must implement a maintenance
schedule for cleaning and maintaining the DPF. If not handled with the appropriate care,
not only can the DPF begin to release harmful particulates into the vehicle's exhaust, but
it may cause damage to the rest of the aftertreatment system and the engine itself.
Additionally, fleets should be aware that the DPF could reach a point where cleaning is no
longer enough, meaning the DPF is failing and must be replaced. When it comes to replacing
a DPF, fleets have three options: buy brand new from the original equipment manufacturer



Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime: Expecting the unexpected
Editor's Note: Catching up on fleet maintenance
Maintenance considerations for manual versus automated manual transmissions
DPFs: Clean or replace?
Why Identify and track vehicle warranties?
Lube it or lose it
OTA: Supporting uptime remotely
Management: How fleets can benefit from having a SAMP
Training: Supporting today's students and tomorrow's techs
Diagnostics: Assessing aftermarket diagnostic solutions
Fleet Part & Components
Tools & Equipment
Guest Editorial: Keeping tire pressure at optimum levels
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime: Expecting the unexpected
Fleet Maintenance - 9
Fleet Maintenance - Editor's Note: Catching up on fleet maintenance
Fleet Maintenance - 11
Fleet Maintenance - Maintenance considerations for manual versus automated manual transmissions
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - DPFs: Clean or replace?
Fleet Maintenance - 19
Fleet Maintenance - 20
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - Why Identify and track vehicle warranties?
Fleet Maintenance - 25
Fleet Maintenance - 26
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - Lube it or lose it
Fleet Maintenance - 31
Fleet Maintenance - 32
Fleet Maintenance - 33
Fleet Maintenance - OTA: Supporting uptime remotely
Fleet Maintenance - 35
Fleet Maintenance - Management: How fleets can benefit from having a SAMP
Fleet Maintenance - Training: Supporting today's students and tomorrow's techs
Fleet Maintenance - Diagnostics: Assessing aftermarket diagnostic solutions
Fleet Maintenance - 39
Fleet Maintenance - Fleet Part & Components
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - Guest Editorial: Keeping tire pressure at optimum levels
Fleet Maintenance - 43
Fleet Maintenance - 44
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