Feasibility study of a CVT system for an internal-combustion engine/flywheel-drive vehicle

Technical Report · Wed Oct 01 00:00:00 EDT 1980

OSTI ID:6091339

Kemper, Y; Elfes, L E; Trachman, E G

The results are presented of an engineering feasibility study of a continuously variable transmission (CVT) for an automobile equipped with a conventional internal combustion engine and a flywheel energy storage device. The objectives of this study were to: complete a preliminary design layout of the vehicle engine compartment with the engine, drive train and flywheel installed to establish the feasibility of installing the package in an existing vehicle; perform a computer simulation of the vehicle fuel consumption in order to identify and minimize energy losses and to predict vehicle mileage performance; and perform a detailed analysis of the traction drive, including efficiency estimates, contact stresses, film temperatures, etc. The final design is shown. The arrangement can be installed in the engine compartment of a citation with no major structural changes. After multiple runs to optimize the CVT design and to minimize power losses in the accessory drives, computer simulation showed that the baseline vehicle (Std. Citation w/2.5L, 4-cyl. engine and 4 speed manual transmission) achieved 21.6 mpg in the EPA Urban Cycle and 33.3 mpg in the EPA Highway Cycle. The comparable fuel economies for the Flywheel Energy Storage Vehicle (CVT driveline) were 30.8 mpg and 34.6 mpg. (LCL)

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6091339
• Report Number(s): UCRL-15356; ON: DE82000734
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AUTOMOBILES
FUEL CONSUMPTION
MECHANICAL TRANSMISSIONS
FLYWHEEL-POWERED VEHICLES
DESIGN
COMPUTERIZED SIMULATION
FEASIBILITY STUDIES
FLYWHEELS
INTERNAL COMBUSTION ENGINES
PERFORMANCE
THEORETICAL DATA
DATA
ENERGY CONSUMPTION
ENGINES
HEAT ENGINES
INFORMATION
MACHINE PARTS
MECHANICAL ENERGY STORAGE EQUIPMENT
NUMERICAL DATA
SIMULATION
VEHICLES
330602* - Vehicle Design Factors- Engine-Transmission Matching
330400 - Advanced Propulsion Systems- Hybrid Systems