Find out how Maxx Air Group's emission reduction technologies can help green your fleet

1. Diesel Emissions Overview
Phillip Surma

2. Bus Retrofit Overview
• Maxx Air Group Introduction
• Diesel Filter Technology Profiles
• Engine Performance Profiles
• DPF Selection
• DPF Tips

3. Maxx Air Group Introduction
• Maxx Air - West (California)
– Sales, Installation, Service, DPF Cleaning
• Maxx Air – Midwest (Illinois)
– Sales, Installation, Service
• Emission Control Technologies
– R&D, Fleet Consulting & Management Services
• QuickClean
– DPF manufacturing

4. Maxx Air Group Introduction
• Consulting and Technical Expertise on All
Types of Diesel Particulate Filter Systems
• Grant Application Assistance
• Data Logging and Opacity Testing
• Quality Installations
• Maintenance Services
• Diesel Particulate Filter Cleaning and
Testing

5. Maxx Air Group Introduction
Product Portfolio
•Hug DPF Filter Systems
•ECS DPF Filter Systems
•KwickClean Filters
•Huss DPF Filter Systems
•CPK Data Loggers
•Diesel Pre-heaters

6. Diesel Filter Technology Profiles
DPF (substrate) Types
•Partial or Flow Through Filters
•15% to 60%
•High Efficiency Wall Flow Filters
•85% to 98%

7. Diesel Filter Technology Profiles
Regeneration Types
•Passive
•Passive / Active (engine on)
•Active (engine off)
•Off Line

8. Diesel Filter Technology Profiles
Oxidation Catalysts (DOC)
A diesel oxidation catalyst consists of a stainless
steel canister that contains a honeycomb structure
called a substrate. The interior surfaces are coated
with catalytic metals such as platinum or palladium. It
is called an oxidation catalyst because the device
converts exhaust gas pollutants into harmless gases
by means of chemical oxidation.

9. Diesel Filter Technology Profiles
Passive DPF
To facilitate decomposition of the soot, a catalyst is used in the
form of a coating on the filter. Filters that regenerate in this so-
called "passive" fashion cannot be used in all situations. Despite
the high efficiency of the catalyst, a layer of ash may build up on
the filter requiring replacement or servicing. The ash is made up of
inorganic oxides from the fuel or lubricants used in the engine and
will not decompose during the regular soot regeneration process.

10. Diesel Filter Technology Profiles
Passive / Active (engine on)
In some applications or operating cycles, the
exhaust never achieves a high enough
temperature to completely oxidize the soot
even in the presence of a catalyst. In these
instances, an "active" regeneration system
must be employed. Active regeneration utilizes
a fuel injector nozzle upstream of the DOC
element to heat the filter and oxidize the soot.

11. Diesel Filter Technology Profiles
Engine off active regeneration utilizes a fuel burner or a resistively
heated electric element to heat the filter and oxidize the soot.
Active regeneration can be employed either in-place on the
vehicle or externally.
Active (engine off)

12. Diesel Filter Technology Profiles
Typical Active DPF installation

13. Diesel Filter Technology Profiles
The filter element of the KwikClean soot filter consists
of a ceramic fiber knitted mesh, reinforced with a
stainless steel core. This design makes it resistant
against high temperatures without losing its flexibility.
The filter module is fitted into the filter housing and
held by a quick-release clamp for easy change out.
Off-Line (Removable)

14. Engine Performance Profiles
Data Logging
•Data logging of the exhaust
temperature, back pressure, and
duty cycle is needed to determine
the correct DPF technology for a
given vehicle or group of vehicles in
your fleet.

15. Engine Performance Profiles
High Heat & Heavy Duty Cycle

16. Low Heat & Light Duty Cycle

17. DPF Selection
Engine
Model
Year
Temperature
Profile
Technology
Type
Operator
Interaction
In-Use
Regeneration
No
Operator Action
15% - 40%
Duty Cycle
400-520o
F
Engine on
Regeneration
No
Operator Action
Engine Off
Regeneration
Requires
Button Push
5%-15% of
Duty Cycle
>360o
F
Temperature
Not A or B
“Low Temp”
1994 to
2006
(2012)
<1994
Rebuild
Repower
Replace
Engine
A
B
C
Passive
Passive
/ Active
Active
Custom
Filter
Solution

18. DPF Tips
• Match the correct emission system
to the engine/duty cycle
• Use pre-heaters in cold startup
conditions – don’t idle for warm-ups
• Perform de-ashing service using
manufacturers recommendations
• Correct installation = best system
performance

19. Maxx Air Group
Thank you