Exhaust aftertreatment devices can reduce harmful engine exhaust emissions, are proven, cost effective, and readily available.  Depending on the type and CARB Verified Level of each device, they can reduce, or nearly eliminate some of the following emissions:

• NOx – Nitrogen Oxides, a contributor to ozone, or smog
• PM10 – Particulate Matter, measuring 10 microns in diameter, commonly referred to as “soot” or “black smoke”.  PM has been identified by CARB as a toxic air contaminant
• CO – Carbon Monoxide, a poisonous gas, a result of incomplete combustion
• HC – Hydrocarbons, a contributor of smog, a result of incomplete combustion
• SOx –Sulfur Oxides, a result of Sulfur in diesel fuel

Cummins Emission Solutions 

Over recent years, there have been many technological advancements that have led to a reduction in heavy duty engine emissions.  From the fuel, to the engine technology, to the exhaust aftertreatment, all have played a part in making diesel engines cleaner.

In 2002, Cummins began using Exhaust Gas Recirculation (EGR) and our patented Variable Geometry Turbocharger (VG Turbo) to help reduce emissions, and comply with the stringent California Air Resource Board’s (CARB) emission standards.  By re-routing some of the exhaust gases, and introducing it back into the intake system, combustion temperatures can be reduced, along with smog and ozone producing NOx emissions.  Cummins has further refined this EGR system to include a cooled EGR system, providing additional emission reductions, and every component is controlled by a single robust Engine Control Module (ECM) to ensure fuel efficiency, reliability and durability.

Starting in 2007, the State of California mandated that all on road diesel fuel sold in the state be Ultra Low Sulfur Diesel (USLD), having less than 15 ppm of Sulfur.  This is a considerable reduction from the previous CARB standard of 500 ppm.  This cleaner fuel reduces the SOx in the exhaust, and allows for the use of exhaust aftertreatment devices, which can further reduce emissions.

Diesel Oxidation Catalyst
Engineered for retrofit to meet tough clean air standards, the Diesel Oxidation Catalyst (DOC)  breathes new life into diesel engine exhaust systems with EPA-verified technology. Because this particulate filter has been developed using in-house expertise, it has been integrated with the combustion and air-handling systems from the beginning for optimum performance.  Easy to install and maintenance –free, the DOC is reducing emission from on-highway vehicles and off-highway equipment around the globe, cost effectively and efficiently.

The DOC may either replace or be added to the existing muffler, and may be applied to a wide variety of diesel engines.

• Installs easily
• Needs no maintenance
• Requires no monitoring
• Can be used with low-sulfur(<500ppm) or ultra-low sulfur diesel fuels (<50ppm)
• Is available in a variety of shapes and sizes
• Readily adapts to many applications
• Cannot be used with lube oil blending systems
• May be used in a catalytic exhaust muffler to reduce noise as well as emissions

Diesel Particulate Filter
Designed for retrofit, Cummins diesel particulate filter uses EPA-verified Johnson Matthey patented Continuously Regeneration Technology® (CRT) that removes up to 85% of particulate matter emissions. This filter works in lower-temperature applications than most other systems. 

The CRT filter traps and oxidizes soot before turning to ash.  Designed as a complete muffler replacement unit, the modular system is easy to install and maintain.

To ensure optimum performance of the filter and engine, the diesel particulate filter system monitors engine pressure and temperature.  Controls in the cab alert operators when backpressure is high and the filter needs cleaning.

Cleaire Advanced Emission Controls

Cleaire Horizon
This Level 3 Particulate device uses an active regeneration system which uses clean electricity, through an integrated heating element to “cook off” the captured diesel particulate, much like a self cleaning oven, while the vehicle is parked overnight.  This allows the Horizon to be used on equipment that may not meet the minimum exhaust temperature requirements of other devices.

Horizon™ is managed by Cleaire’s proprietary MLC® which monitors system parameters and controls the automatic electric regeneration process. The MLC also stores the monitored parameters in the memory for later retrieval and analysis.

The Horizon is verified for both mobile and stationary applications, and is verified for a wide range of engine makes and models.  It is approved for most pre-2006 on-highway applications, and pre-2007 Tier 1, off-highway applications.

Cleaire Longview
The Longview integrates a NOx reduction catalyst and catalyzed wall-flow silicon carbide diesel particulate filter. This provides simultaneous reduction of NOx, PM, hydrocarbon (HC) and carbon monoxide (CO) from one system.  This Level 3 device reduces PM by a minimum of 85%, and NOx by a minimum of 25%, and is verified for a wide range of on road engines from 1993-2003.

Longview is managed by Cleaire’s proprietary MLC® which monitors system parameters and controls NOx reductant (diesel fuel) injection. The MLC also logs the monitored parameters for later retrieval and analysis.  The Longview is currently only verified for on-highway applications. 

The Longview Multi-pollutant purifier uses a catalytic porcess to simultaneously convert all four major criteria pollutants from diesel engines: particulate matter (PM), oxide os nitrogen (NOx), carbond mondoxide (CO) and hydrocarbon (Hc) to water and benign gases nitrogen (N2) and oxygen (Co2).

Johnson Matthey Emission Control Technologies

Johnson Matthey has supplied a complete line of emission control after-treatment technologies for over 30 years.   Johnson Matthey’s HDD-NA Group works exclusively on mobile heavy-duty diesel applications for both on-highway and off-highway use.