Steady-state and dynamic evaluation of the electric-propulsion system test-bed vehicle on a road load simulator
The propulsion system from the electric propulsion system test bed vehicle was evaluated on the road load simulator (RLS). Track tests had previously been conducted. The electric vehicle was built from components representative of 1976 technology, including a series-wound dc motor and a commercially avaiable silicon-controlled rectifier (SCR) chopper type of controller. An 84-V battery pack was used with the system in the vehicle. A large motor-generator battery simulator was used in all of the RLS tests. Steady-state tests were conducted over a wide range of differential outputs and vehicle speeds. Efficiencies of the system and of the individual components were mapped. The maximum system efficiency measured was 67 percent at 64-km/h (40-mph) vehicle speed and 113-N-m (1000-lb-in) differential torque. The effects of motor temperature on motor efficiency and of battery voltage on motor and controller efficiencies were evaluated. Dynamic tests were also conducted on the system by running it over the SAE J227a B and C driving schedules. The energy efficiency over schedule B was 55 percent; that over schedule C was 58 percent. Over schedule B the total energy taken from the battery was 155 Wh/km (249 Wh/mile). Over schedule C, 178 Wh/km (287 Wh/mile) was removed from the battery.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- DOE Contract Number:
- AI01-77CS51044
- OSTI ID:
- 5787199
- Report Number(s):
- DOE/NASA/51044-32; NASA-TM-83445; ON: DE84000606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tests of an alternating-current propulsion subsystem for electric vehicles on a road load simulator
AC propulsion system for an electric vehicle. Phase 1, final report