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May 29, 2014  |   Comments (0)   |   Post a comment

Emission-control technology offers low-maintenance solutions

Diesel particulate filters, mufflers and engine pre-heaters help school bus operators keep the air in and around their vehicles clean with minimal maintenance required. Technology upgrades now allow for optimal operation and pre-programmable engine pre-heating in even lower temperatures.

by Nicole Schlosser - Also by this author


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The Horizon, a diesel particulate filter from ESW Group, allows for low-exhaust temperatures that come with route variations.
<p>The Horizon, a diesel particulate filter from ESW Group, allows for low-exhaust temperatures that come with route variations.</p>

ESW Group

With the school bus market being one of ESW Group’s largest, particularly in California, ESW offers three emission-control products that cover the entire bus duty cycle: the Thermocat E, Long Mile S and the Horizon, Adam Gross, director of sales at ESW Group, says. All three are EPA-certified and provide CARB-certified level 3-plus performance, with more than 85% particulate matter reduction.

The Horizon is an active product, using electrical plug-in regeneration, and the Long Mile S is a passive system; it regenerates by employing hotter exhaust temperatures.

Meanwhile, the Thermocat E is an active/passive hybrid. It is verified through CARB as an active product because it has an external fuel source that is used to regenerate the product, but it acts passively without any driver or operator interaction, Gross explains.

Neither the Thermocat nor the Horizon require a hot exhaust temperature to regenerate. Both allow for low-exhaust temperatures that come with route variations, from the long haul to a route that picks up kids around the neighhorhood.


Espar’s new E-Guardian Plus M-II engine pre-heater can be programmed to turn on at a set time on any given day.
<p>Espar’s new E-Guardian Plus M-II engine pre-heater can be programmed to turn on at a set time on any given day.</p>

Espar Heater Systems

Espar’s E-Guardian Plus series of pre-heaters is programmable to turn on at a set time on any given day, says John Dennehy, VP of marketing and communications.

The E-Guardian Plus D5 and M-II units, both CARB- and EPA-verified, are designed to provide powerful preheating and auxiliary internal heat for bus applications. The units are compact and lightweight, and provide automatic altitude compensation. Additionally, Espar’s M-II heaters offer six operating speeds for reduced battery draw and fuel consumption.

The units start preheating the coolant and circulating it around the engine block and through the coolant chain, which run through the length of the bus and back and to the heat exchange, so it preheats the engine and the bus without the engine idling because it is a completely separate entity from the engine, Dennehy explains.  

Espar’s Multi-Max controls the unit and allows operators to preset an entire fleet of buses with one button, Dennehy says.


Webasto’s Thermo Top C engine pre-heater is small, lightweight, and reduces the wear and tear on DPFs by cutting the amount of emissions introduced into the DPF.
<p>Webasto’s Thermo Top C engine pre-heater is small, lightweight, and reduces the wear and tear on DPFs by cutting the amount of emissions introduced into the DPF.</p>

Webasto

Webasto’s Thermo Top C is small, light in weight, and reduces the wear and tear (extends maintenance cycles) on DPFs by reducing the amount of emissions introduced into the DPF at startup, Baczewski says.

Thermo Top C pre-heats the engine to the starting temperature, considerably reducing the load on the engine caused by a cold start. The engine pre-heater also eliminates the need to idle the engine to heat the bus, which reduces both fuel consumption and CO2 emissions.

Additionally, Scholastic Series Heater, introduced specifically for the school bus industry in 1996, is designed to be a fully functional heating system that not only will pre-heat an engine but also heat the passenger compartment and maintain heat while the vehicle is operating.

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