Trucks 3Solutions for Fleet Managers: The Six Rs of Managing Diesel Engine Emissions

By following the “Six Rs” described below, fleet managers can help their vehicles reduce emissions.

1. Reduce Idling

  • Reduce idling by turning off engines stopped for more than a few minutes to save fuel and money while reducing air pollution and saving lives.
  • Adopt anti-idling policies for public and private fleets.
  • Pass and enforce community anti-idling legislation that will limit unnecessary idling.

2. Refuel Using Cleaner Fuels

  • Switch to less polluting fuels and vehicles, including:
    • Ultra Low Sulfur Diesel (ULSD)
  • Use ULSD in non-road construction equipment
  • Clean Fuels
    • Biodiesel
    • E85
    • Compressed Natural Gas
    • Propane
  • Vehicles
    • Newer vehicles that are designed to meet new emission standards
    • Hybrids
    • Flex-fueled vehicles
    • Electric

3. Repair/Rebuild/Maintain Existing Engines

  • Routine engine maintenance provides emission reduction benefits.
  • Repair and/or rebuilding of older, non-efficient engines should result in lower emissions

4. Replace Older Fleets with Clean-Technology Equipment – Fleet Turnover

  • Replace existing fleets with newer vehicles with newer emissions technologies
  • Within fleets, prioritize vehicles for replacement based upon:
  • Age
  • Daily use and load amount
  • Amount of emissions

5. Re-power Vehicle with Newer, Clean-Burning Engine

  • Re-power existing fleets with newer engines
  • Within fleets, prioritize vehicles for engine replacement based upon age, daily use and emissions of pollution
  • Consider using:
    • Auxiliary Power Units (APUs)
      • Save fuel cost
      • Reduce harmful emissions
      • Roughly $6,000—$8,000 to purchase
      • Provide power supply overnight for comfort (HVAC, lighting, accessories)
  • Heaters
    • Accelerate and maintain window defrosting and defogging
    • Reduce emissions and eliminates idling
    • Stop white smoke
    • Extend the life of the engine
    • Substantial fuel cost savings by reducing idling time
    • Roughly $1,000 to purchase
    • Cut down on warm-up time by preheating the engine
  • Engine plug-ins
    • Reduce idling time by warming engine overnight
    • Save fuel cost
    • Reduce harmful emissions
    • One person can plug in several buses
    • Saved fuel translates into higher utility bill (weigh options)

6. Retrofit Existing Vehicles with Emissions Filters/Catalysts

  • Diesel Particulate Filters (DPFs)
    • Cost: $5,000-$9,000
    • Benefits: Reduces particulate matter by 60-90%
    • DPFs need to be cleaned every 100,000 miles
    • Lasts 7-15 years, most have a warranty of three years
    • Must be used with ULSD fuel on engines built after 1994
  • Diesel Oxidation Catalyst
    • Cost: $1,000-$2,500
    • Benefits: Reduces PM emissions by 20-30%
    • Does not require special maintenance
    • Lasts 7-15 years
    • Can be used with regular diesel fuel, but most effective with ULSD
  • Closed Crank Case Filter
    • Cost: $500-$1,000
    • Benefits: Eliminates 90%+ of in-cabin crank case emissions of fine particulate matter pollution
  • Filter needs to be changed at every oil change or after 500 hours of operation (whichever is first)
    • Lasts 5 years
Tools for Fleet Managers

Diesel School Bus Studies

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Last updated: 10/31/2016 3:23:34 PM