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July 05, 2011  |   Comments (1)   |   Post a comment

The Latest in Emission-Control Technology

From diesel particulate filters to diesel oxidation catalysts to crankcase filtration systems to a hybrid system, there are numerous products available to the industry. Their emission-reduction capabilities range from 20 to more than 90 percent, and they can be applied to a variety of engines and school buses.

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Engine Control Systems also offers AZ Purifier and AZ Purimuffler diesel oxidation catalysts for school buses. They are certified by CARB and the EPA for two- and four-stroke diesel engines, and they reduce particulate emissions up to 40 percent.

The AZ Purifier is contained in a separate converter that is installed upstream of the vehicle’s original muffler. The AZ Purimuffl er incorporates the catalyst into a direct-fit muffler that replaces the original vehicle muffler.

Dana Brewster, central east regional sales manager, says the Purimuffler is the more popular option between the two. It is made of stainless steel, which enables it to withstand harsh weather and road salt, and Brewster says Engine Control Systems builds a replica of the original equipment muffler that the Purimuffler will replace.

“If we need a muffler that’s a certain size and shape and we don’t have it in our system, our engineering team creates a new part so that we can spec it to match,” he explains, adding that he feels the company’s ability to provide a replica of the original equipment muffler is one of its strengths.


Pictured is the Hybrid Drive Unit forEaton’s hybrid system. It comprises the transmission and the motor/generator. The system can reduce emissions by more than 30 percent.
<p>Pictured is the Hybrid Drive Unit for<br />Eaton’s hybrid system. It comprises the transmission and the motor/generator. The system can reduce emissions by more than 30 percent.</p>

Eaton hybrid system reduces emissions, fuel consumption
Diesel particulate filters, diesel oxidation catalysts and crankcase filtration systems are not the only types of technology available to help school buses run cleaner. Another option to consider is operating buses powered by a hybrid system.

James Parks, manager of global communications for Eaton Vehicle Group, says the company’s hybrid system is available through IC Bus with its CE Series unit and through Thomas Built Buses with its Saf-T-Liner C2e unit.

IC Bus’ hybrid bus combines the Advanced EGR-equipped MaxxForce DT and an electric motor with a peak power output of 44 kilowatts.

Thomas Built’s hybrid bus is powered by a Cummins diesel engine, an Eaton transmission and an electric motor developed jointly by Thomas Built, Eaton and Freightliner Custom Chassis Corp.

“We use the electric motor to help launch and drive the bus from a stop, and then through regenerative braking we slow the bus down and recharge the batteries so there is always energy to launch and drive the bus,” Parks explains.

He adds that the hybrid system reduces fuel consumption and there is less wear and tear on the drivetrain, which can provide maintenance cost savings.

“The system is also quieter than a traditional bus, which is an added benefit,” Parks says.

Thomas Built’s hybrid Saf-T-Liner C2e can reportedly reduce emissions and improve fuel economy by 30 percent or more, while the IC Bus CE Series hybrid unit can reportedly provide up to a 30-percent improvement in fuel economy, up to a 35-percent reduction of NOx emissions and up to an 85-percent reduction of diesel particulates.

“School districts across the country are looking for ways to reduce their fuel costs and provide a greener footprint for their community without compromising passenger or driver comfort, and we think we’ve given them a pretty compelling story with the IC Bus and Thomas bus options. Customers of our hybrid systems have gone well over 100 million miles with reliable service,” Parks says.

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Read more about: emissions, engines, EPA, hybrid bus, IC Bus, Thomas Built Buses

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It has been said so many times, "Our students are the most valued end users of the total transportation network." This fact remains true year after year. Any money spent to protect our students is like an investment in the future of our country. Emission control devices, such as mentioned in this article, are certainly a worthy investment. This investment however, is not a single purchase and forget item. Routine maintenance of not only the engine but the emission control device will greatly prolong the designed intent of the investment in reducing pollutants into the atmosphere and protecting our young and future. The "ash" load, or the build up of ash in the DPF, will over time cause the device to fail and require replacement. As the DPF fills with ash during normal, expected operation an increase in engine back pressure is experienced which reduces fuel efficiency. The increased cost to fuel and operate school busss in your fleet could be allocated to other beneficial expenses. A good rule of thumb is to have the DPF removed and cleaned at least annually. For the most part North America has idled a significant number of school busses for the summer break. Now is the time to address the ash build up in the DPF or clean and renew the oxidation catalyst (DOC) for your fleet of busses. DPF Cleaning Specialists is a company that can work with fleets to maximize the effectiveness of both the DPF and the DOC, reduce engine back pressure and provide preventive maintenance guidelines. Consider taking advantage of this idle time to address these emission control devices.

DPF Cleaning Specialists    |    Jul 07, 2011 05:08 AM

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