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Old 07-11-2020, 05:23 PM   #21 (permalink)
It's all about Diesel
 
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CNG trucks are also signifigantly heavier than diesel trucks with similar range.
That's one reason why I consider it more viable to use CNG on urban transit buses than in heavy trucks. Garbage trucks might be a good case for CNG as long as they can resort to biomethane extracted from the landfills.

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Old 07-12-2020, 02:11 PM   #22 (permalink)
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Garbage trucks should be battery powered by now. Short distances, high torque needed, constant starts/stops. Absolutely perfect job for a battery/electric drivetrain.
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Old 07-12-2020, 11:34 PM   #23 (permalink)
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But almost all municipalities want to buy the cheapest price garbage truck they can get, since it's just a garbage truck. No one cares if the garbage trucks are nice.
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Old 07-13-2020, 04:00 AM   #24 (permalink)
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Emission regulations are helping to speed that transition as NG trucks burn clean enough to avoid urea injection and particulate filters. They are as simple as pre-emission diesels.
Particulate filters yes, urea injection no. Excess air is mandatory at low load for compression ignition, making the urea injection necessary.
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Old 07-13-2020, 09:41 AM   #25 (permalink)
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But almost all municipalities want to buy the cheapest price garbage truck they can get, since it's just a garbage truck. No one cares if the garbage trucks are nice.
Most of the munis I am associated with subcontract to Waste Management or one of their affiliates which are not noted for their concerns about anything but profit
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Old 07-13-2020, 08:07 PM   #26 (permalink)
It's all about Diesel
 
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Particulate filters yes, urea injection no.
Natural gas avoids both, even if a dedicated-CNG engine would rely on direct injection.
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Old 07-13-2020, 10:55 PM   #27 (permalink)
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Quote:
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Particulate filters yes, urea injection no. Excess air is mandatory at low load for compression ignition, making the urea injection necessary.
Dedicated CNG engines like the Cummins L9N are spark ignition.

https://freightlinerads.azureedge.ne...2019-05-31.pdf

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CUMMINS WESTPORT L9N 8.9 LITER NATURAL GAS ENGINE
• Uses stoichiometrically-cooled EGR combustion
• EPA 2017 and CARB emissions standards compliant
• Available up to 320 HP, 1000 lb-ft torque
• No SCR aftertreatment system required
• Maintenance-free exhaust system
• No DPF regeneration, cleaning or replacement
• Spark-ignited
• Dedicated natural gas engine – no dual fuel
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Old 07-14-2020, 03:50 PM   #28 (permalink)
It's all about Diesel
 
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Now that Scania is partnering with Cummins, it would be interesting if they tried ethanol in a spark-ignited engine initially developed for CNG. Might work better than the failed compression-ignition ethanol engines which required an ignition improver to be blended into the ethanol, plus it could allow a much useful limp-home mode once CNG is depleted. This could eventually be a good option for agribusiness in Brazil.

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