SciTech Connect

Title: Evaluation of 2004 Toyota Prius Hybrid Electric Drive System

Evaluation of 2004 Toyota Prius Hybrid Electric Drive System The 2004 Toyota Prius is a hybrid automobile equipped with a gasoline engine and a battery- and generator-powered electric motor. Both of these motive-power sources are capable of providing mechanical-drive power for the vehicle. The engine can deliver a peak-power output of 57 kilowatts (kW) at 5000 revolutions per minute (rpm) while the motor can deliver a peak-power output of 50 kW over the speed range of 1200-1540 rpm. Together, this engine-motor combination has a specified peak-power output of 82 kW at a vehicle speed of 85 kilometers per hour (km/h). In operation, the 2004 Prius exhibits superior fuel economy compared to conventionally powered automobiles. To acquire knowledge and thereby improve understanding of the propulsion technology used in the 2004 Prius, a full range of design characterization studies were conducted to evaluate the electrical and mechanical characteristics of the 2004 Prius and its hybrid electric drive system. These characterization studies included (1) a design review, (2) a packaging and fabrication assessment, (3) bench-top electrical tests, (4) back-electromotive force (emf) and locked rotor tests, (5) loss tests, (6) thermal tests at elevated temperatures, and most recently (7) full-design-range performance testing in a controlled laboratory environment. This final test effectively mapped the more » electrical and thermal results for motor/inverter operation over the full range of speeds and shaft loads that these assemblies are designed for in the Prius vehicle operations. This testing was undertaken by the Oak Ridge National Laboratory (ORNL) as part of the U.S. Department of Energy (DOE)-Energy Efficiency and Renewable Energy (EERE) FreedomCAR and Vehicle Technologies (FCVT) program through its vehicle systems technologies subprogram. The thermal tests at elevated temperatures were conducted late in 2004, and this report does not discuss this testing in detail. The thermal tests explored the derating of the Prius motor design if operated at temperatures as high as is normally encountered in a vehicle engine. The continuous ratings at base speed (1200 rpm) with different coolant temperatures are projected from test data at 900 rpm. A separate, comprehensive report on this thermal control study is available [1]. « less
Authors: ; ; ; ;
Publication Date:
OSTI Identifier:890029
Report Number(s):ORNL/TM-2006/423
TRN: US200620%%208
DOE Contract Number:DE-AC05-00OR22725
Resource Type:Technical Report
Data Type:
Research Org:Oak Ridge National Laboratory (ORNL), Oak Ridge, TN; Pacific Northwest National Laboratory (PNNL), Richland, WA
Sponsoring Org:USDOE - Office of Energy Efficiency and Renewable Energy (EE)
Country of Publication:United States
Language:English
Subject: 01 COAL, LIGNITE, AND PEAT; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 33 ADVANCED PROPULSION SYSTEMS; AUTOMOBILES; COOLANTS; EFFICIENCY; ELECTRIC MOTORS; ENGINES; EVALUATION; FABRICATION; FUEL CONSUMPTION; INTERNAL COMBUSTION ENGINES; MOTORS; PEAK LOAD; PERFORMANCE TESTING; PROPULSION; ROTORS; TESTING; VELOCITY