Real time simulation of fuel economy for platooning cars and trucks
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Real-time simulation of fuel economy for platooning cars and trucks. Acquire data on fuel consumption for trucks in platoon operation. Create a real-time simulation of fuel savings for display during DEMO 2003. Provide a predictive model of use to the trucking industry.

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Real time simulation of fuel economy for platooning cars and trucks l.jpg
Real-time simulation of fuel economy for platooning cars and trucks

  • Acquire data on fuel consumption for trucks in platoon operation.

  • Create a real-time simulation of fuel savings for display during DEMO 2003.

  • Provide a predictive model of use to the trucking industry.

Jerry Chen & Fred Browand

Ground Vehicle Aerodynamics Lab


Collect data on fuel consumption for trucks in platoon operation l.jpg
Collect data on fuel consumption for trucks in platoon operation

  • Broadcast fuel rate (cm3/sec) and wheel speed outputs on SAE J1939 serial data link are adequate to provide instantaneous fuel consumption in liters/kilometer (or gallons/mile).

  • Cummins estimates absolute accuracy of broadcast fuel rate to be within ± 3% of output value.

  • The relative measurement (for each truck):

    (fuel consumption)platoon/(fuel consumption)isolation

will be much more accurate. Both these measurements must follow one another under identical ambient wind and temperature conditions.


Provide a predictive model of use to the trucking industry l.jpg
Provide a predictive model of use to the trucking industry operation

  • Fuel saving in platoon travel arises solely from a decreased aerodynamic drag.

  • Predictive models for fuel savings are related to drag savings.

  • Example:

    FC = fuel consumption, p-platoon, a-isolation

    r = rolling resistance, dz/ds = road gradient

    Wt, S, U, ρ = weight, area, velocity, air density


Provide a predictive model of use to the trucking industry4 l.jpg
Provide a predictive model of use to the trucking industry operation

  • Infer drag changes from changes in fuel consumption for operating platoon.

  • Compare field measurements with our wind tunnel measurements for two close following trucks.

  • Evaluate and resolve inconsistencies.


Slide5 l.jpg

The drag of a single body with and without rounded vertical edges

W: H: L (w/attachment)

1: 1.4: 4.2 (4.5)

W: Ground Clearance

1: 0.28

CD = 0.94 .02

U = 26 m/s

Re = UW/ = 267,000

Blockage corrections based

upon local q derived from

wall-static pressure

CD = 0.51 .01


Slide6 l.jpg

Drag versus separation edges

BLUNT-BLUNT

BLUNT-ROUNDED

ROUNDED-ROUNDED

ROUNDED-BLUNT



Slide8 l.jpg

No less savings edges

Bonnet & Fritz

field test

No greater savings

Total drag summary

BLUNT - ROUNDED

ROUNDED - ROUNDED

BLUNT - BLUNT

ROUNDED - BLUNT


Work effort next 9 months l.jpg
Work effort next 9 months edges

  • Acquire additional data from single truck runs, and evaluate data quality. Assist as needed. Be available for wind, temperature measurement. (0-4 months)

  • Acquire data for platoon of trucks, and evaluate data quality. Record wind, temperature. Input data into our most recent display program. (4-9 months)

  • Continue to improve animated display. (0-9 months)

  • Other suggestions. Animation schemes welcome.