© 2018 Pierce Manufacturing Inc. All Rights Reserved.
Engine Exhaust After Treatment Systems / 5-21
OPERATION
Engine Exhaust After Treatment Systems
5-11. Introduction
NOTE:
Applies to all U.S. Domestic vehicles manufactured after 2007 and some export vehicles.
Your Pierce apparatus is equipped with a specialized exhaust equipment designed to meet tiered EPA regulations,
based on both calendar year and vehicle usage (i.e. on-road or off-road), to reduce soot (partially burned fuel
particles), ash (partially burned oil particles), and nitrogen oxide (NOx) emissions.
5-11.1
Emissions Equipment and Functions
Figure 5-1: Typical After Treatment System Components (2010 and Later EPA Engines)
A0062
The major after-treatment devices used with the engine in your Pierce® fire apparatus may include:
•
After Treatment Device (ATD), a special exhaust canister which has replaced the typical muffler. This canister
contains a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). The DPF will trap particulate
matter or soot and ash while the engine is running. Soot accumulation in the DPF requires periodic self-cleaning
through a process called regeneration.
— Regeneration may occur naturally when the exhaust is hot enough to burn the soot off.
— Regeneration may require intervention, either by the engine ECU or operator intervention, by injecting a
small amount of fuel into the DOC, which raises exhaust temperatures enough to burn off accumulated soot.
— See
“Cummins and Ford Regeneration”
“Detroit Diesel ATD Regeneration”
depending on your engine.
•
Selective Catalyst Reduction (SCR) device. The SCR is a catalytic converter that uses vaporized diesel exhaust
fluid (DEF), fed by a tank., to reduce nitrogen oxide (NOx) emissions created during the combustion process.
•
Diesel Exhaust Fluid (DEF). Also known as DEF, urea, or Ad-Blue, a solution of 32.5% urea and deionized water,
which breaks down into ammonia NH
3
) during a chemical reaction in a decomposition reactor through a process
known as hydrolysis. The NOx and ammonia (NH
3
) pass into the SCR element where a catalytic reaction takes
place, converting the NOx into harmless nitrogen gas (N
2
) and water vapor (H
2
O).
•
Related indicator lamps on the driver display to alert the operator of the after-treatment equipment status. Light
functionality is explained in
“After Treatment Device Indicator Lights - Cummins and Ford Engines”
“After Treatment Device Indicator Lights - Detroit Diesel”
•
2013 EPA and later emissions requirements include engines receiving an upgraded engine ECU with fully-
integrated On-Board Diagnostics (OBD). The drive engine indicator panel also includes an additional
Malfunction Indicator Lamp (MIL).
Summary of Contents for Enforcer
Page 1: ... 2018 Pierce Manufacturing Inc Part No PM C OM014 SEN 0718 Operator s Manual Saber Enforcer ...
Page 2: ......
Page 18: ...FOREWORD 1 6 To the Owner and Operator 2018 Pierce Manufacturing Inc All Rights Reserved ...
Page 30: ...SAFETY 2 12 Safety and Responsibility 2018 Pierce Manufacturing Inc All Rights Reserved ...
Page 122: ...OPERATION 5 60 Driving the Vehicle 2018 Pierce Manufacturing Inc All Rights Reserved ...
Page 184: ...A 4 2018 Pierce Manufacturing Inc All Rights Reserved ...