This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Performance Evaluation of Heavy-Duty Vehicles Equipped with Automatic Transmissions and Powertrain Adaptive Systems in Forestry Transportation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 30, 2007 by SAE International in United States
Annotation ability available
The purpose of this study was to evaluate automatic transmissions in a forestry context by comparing their performance with that of standard manual transmissions, and assessing the possibility of improving fuel efficiency by adapting the engine and automatic transmission performances to the vehicle's load. Long-haul test results showed that during the test day, the degradation in driver performance with the manual transmission truck translated into a 2.9% relative increase in fuel consumption when compared with the automatic transmission truck. The fleet data assessment indicated no obvious difference in fuel consumption between the performance of automatic transmissions and manual transmissions.
One system for adapting engine performance to vehicle load uses an onboard weigh scale to determine the load status of the vehicle. Long-haul test results for the engine adaptive system showed a 10.6% improvement when compared with the manual transmission control truck, and 7.9% when compared with the automatic control truck. Computer simulations of the long-haul test showed similar results. In the second system, an electronic control triggers the automatic transmission to convert to an economy shift pattern when the truck is empty. The operational fuel data indicated an overall 4.6% fuel improvement, calculated using baseline and test line ratios between the test and control truck.
The results of this study indicate that automatic transmissions can eliminate driver shifting ability as a factor in fuel efficiency and offer the possibility of adapting a vehicle's performance to meet the changing demands placed on the engine during a trip.
CitationSurcel, M., Michaelsen, J., Carme, R., and Brown, M., "Performance Evaluation of Heavy-Duty Vehicles Equipped with Automatic Transmissions and Powertrain Adaptive Systems in Forestry Transportation," SAE Technical Paper 2007-01-4212, 2007, https://doi.org/10.4271/2007-01-4212.
- “Technical Evaluation of Automatic-type Transmissions for the Heavy Duty Market” Natural Resources Canada, Office of Energy Efficiency, FleetSmart Program 0-662-30631-7 Ottawa, Canada 2001
- Bendel, J. Berg, T. Whistler, D. “Guide To Fuel Economy” Heavy Duty Trucking 83 10 2004
- Carme, R. “Performance Evaluation of Allison Transmission's Automatic Transmission in a Forestry Context” Advantage Report 6 14 Forest Engineering Research Institute of Canada (FERIC) Montreal, Canada 2005
- “Detroit Diesel 2004 Series 60 Truck Power” Detroit, MI 2004
- Prem, H. Ramsay, E. McLean, J. Pearso, B. Woodroofe, J. De Pont, J. “Definition of Potential Performance Measures and Initial Standards” National Road Transport Commission 0-642-54479-64 Melbourne, Australia 2001
- Anderson, P.T. Pyles, M.R. Sessions, J. “The operation of logging trucks on steep, low volume roads” Fourth International Conference on Low-Volume Roads 2 104 111 Transportation Research Board, National Research Council Washington, D.C. 1987
- SAE International “Clutch Application Powertrain Startability Rating Requirements for Truck and Bus Applications” SAE Surface Vehicle Recommended Practice J2649 Warrendale, PA 2004
- “Calculations” MAN Nutzfahrzeuge Aktiengesellschaft Munchen, Germany 2000
- Bulley, B. Blair, C. “Using Reduced Tire Pressure for Improved Gradeability - A Proof of Concept Trial” Proceedings of The International Mountain Logging and 11th Pacific Northwest Skyline Symposium Seattle, WA 2001
- SAE International “Joint TMC/SAE Fuel Consumption Test Procedure - Type II” SAE Surface Vehicle Recommended Practice J1321 Warrendale, PA 1986
- Surcel, M.-D. “Fleet Test Handbook” Forest Engineering Research Institute of Canada (FERIC) Montreal, Canada 2005
- Nader, J. A. Jalinier, C. “OTTO: Truck performance simulation program” Technical Note TN-000195 Forest Engineering Research Institute of Canada (FERIC) Montreal, Canada 1993
- Michaelsen, J. “Using the OTTO Truck-Simulation Software to Manage Haul Operations” Proceedings of 6th international Symposium on Heavy Vehicles Weight and Dimensions Saskatoon, Canada 2000
- Environment Canada - National Climate Data and Archive http://www.climate.weatheroffice.ec.gc.ca/
- Finch, W. F. “Motor Truck Engineering Handbook” Forth 1-56091-378-9 Society of Automotive Engineers Warrendale, PA 1994