This content is not included in your SAE MOBILUS subscription, or you are not logged in.
In-Situ Measurement of Transmission Efficiency in Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
SAE Recommended Practice J1540  specifies test procedures to map transmission efficiency and parasitic losses in a manual transmission. The procedure comprises two parts. The first compares input and output torque over a range of speed to determine efficiency. The second measures parasitic losses at zero input torque over a range of speed. As specified in J1540, efficiency of transmissions is routinely measured on a test-stand under steady torque and speed  . While such testing is useful to compare different transmissions, it is unclear whether the “in-use” efficiency of a given transmission is the same as that measured on the stand. A vehicular transmission is usually mated to a reciprocating combustion engine producing significant torque and speed fluctuations at the crankshaft. It is thus a valid question whether the efficiency under such pulsating conditions is the same as that under steady conditions. The main objective of this work is to develop a high-fidelity measurement technique to calculate “in-situ” transmission efficiency on a real vehicle. Transmission input torque was measured by instrumenting the flex-plate with strain gauges and appropriate telemetry. Transmission output torque was measured by instrumenting the axles with similar strain gauges and telemetry. The developed measurement system was not only capable of handling the pulsating torque and speed fluctuations of the crankshaft but also account for higher order harmonics of the torque signal in the calculation for transmission efficiency.
CitationRengarajan, S., Sarlashkar, J., and Lobato, P., "In-Situ Measurement of Transmission Efficiency in Vehicles," SAE Technical Paper 2017-01-1095, 2017, https://doi.org/10.4271/2017-01-1095.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
- SAE International Surface Vehicle Recommended Practice Manual Transmission Efficiency and Parasitic Loss Measurement SAE Standard J1540, Reaf. Nov 2000
- Ko , Y. and Hosoi , K. Measurements of Power Losses in Automobile Drive Train SAE Technical Paper 840054 1984 10.4271/840054
- SAE International Surface Vehicle Recommended Practice Manual Transmission and Transaxle Efficiency and Parasitic Loss Measurement SAE Standard J2543, Stab Sep 2011
- Moskalik , A. , Dekraker , P. , Kargul , J. , and Barba , D. Vehicle Component Benchmarking Using a Chassis Dynamometer SAE Int. J. Mater. Manf. 8 3 869 879 2015 10.4271/2015-01-0589
- Schagerberg , S. and McKelvey , T. Instantaneous Crankshaft Torque Measurements - Modeling and Validation SAE Technical Paper 2003-01-0713 2003 10.4271/2003-01-0713
- Duoba , M. , Ng , H. , and Larsen , R. In-Situ Mapping and Analysis of the Toyota Prius HEV Engine SAE Technical Paper 2000-01-3096 2000 10.4271/2000-01-3096
- Duoba , M. Ng , and H. Larsen , R. Characterization and Comparison of Two Hybrid Electric Vehicles (HEVs) – Honda Insight and Toyota Prius 724 2016
- Min , B. Matthews , R. Duoba , M. Ng , and H. Larsen , B. Direct Measurement of Powertrain Component Efficiencies for a Light-Duty Vehicle with a CVT Operating Over a Driving Cycle Energy 2003 724 2003
- Mayyas , A. , Prucka , R. , Pisu , P. , and Haque , I. Chassis Dynamometer as a Development Platform for Vehicle Hardware In-the-Loop “VHiL” SAE Int. J. Commer. Veh. 6 1 257 267 2013 10.4271/2013-01-9018