| 摘要 |
A secondary electric power source (19) for a motor vehicle having one or more electric motors (12) for driving respective wheels (10a) of the motor vehicle and having a main electric power source (14) for providing power to electric motors (12) driving the wheels (10a) , and a selector (17) for selecting power from either the main electric power source (14) or the secondary electric power source (19) or both. |
