Quick Answer: What Is Des On A Diesel School Bus?

What does def stand for on a school bus?

If your operation’s shop routinely services diesel-equipped school buses and other diesel-powered vehicles, you may be aware of the use of DEF ( diesel exhaust fluid ). DEF dosing is controlled by the engine’s ECU. When heated, DEF splits into ammonia and carbon dioxide, which is then atomized and vaporized.

What is a DPF on a school bus?

Cummins recognizes the challenge of the traditional school bus duty cycle when it comes to maintaining an aftertreatment Diesel Particulate Filter (DPF). This lamp indicates when the engine needs to regenerate the filter but does not have the proper duty cycle to start the process, or an inhibit switch is active.

What is a Regen on a bus?

The lighter fluid (like extra fuel in an engine) causes a higher temperature burn and the smoke goes away temporarily. This is an active regen. When this happens, a “check engine light” is illuminated on the dashboard, and the bus must be parked, and the driver or technician must tell the bus to manually regenerate.

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What Diesel is in a school bus?

New school buses using clean ultra-low sulfur diesel (ULSD) fuel are able to reduce particulate matter (PM) and hydrocarbon (HC) emissions to levels equal to or lower than comparable natural gas buses. In addition, every school bus on the road eliminates approximately 36 cars.

Can you pee in your DEF tank?

The urea found in urine is not in the proper concentration needed for DEF, nor is it of a sufficient level of purity, in either urea or water. The bottom line, to spell it out just one more time… urine and DEF = Never. DON’T PEE IN YOUR DEF TANK!

Is DEF fluid made from urine?

What is DEF made from? DEF is a mixture of (typically) 2/3 deionized water and 1/3 urea. Technically, urea is derived from one of the byproducts of urine. But it’s synthetically made, so no cats are ever harmed in the production of the fluid.

Do buses have Dpfs?

The DPF technology for buses makes it possible to improve air quality, reduce health risks and help to keep the work place diesel smoke free.

What is a diesel regen cycle?

An active regen cycle is a normal process that takes place as the truck is going down the road. A computer sensor monitors the DPF and a dashboard indicator light notifies the driver that the regen is taking place, or the DPF is now cleaning. “You’ll notice a reduction in power during a regen,” notes Nace.

How do you regen a Thomas school bus?

You need to call Thomas with the body number and ask them how the bus is set up to run a parked regen. Bus in nuetral, park brake set, high idle or normal idle, doors open or closed, a/c on or off. All of those will effect the ability to activate a parked regen.

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How many miles can a diesel bus engine last?

Smith said buses are expected to last about 12-15 years and 250,000 miles under normal conditions. Unfortunately, a growing number of the school district’s buses are older than that, with many more miles.

How many miles can a diesel bus last?

On average, a clean-diesel school bus can travel about 510 miles on a tank of diesel vs. only 270 miles on gasoline, based on the same standard-sized fuel tanks.

Is diesel cleaner than gas?

But the fact remains that diesels are more efficient than gasoline engines —and according to one recent study, newer models are cleaner, except for their higher emissions of nitrogen oxides. Because diesels are more efficient, they do in fact emit less carbon dioxide than gasoline engines.

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