| 摘要 |
PURPOSE: A safety device is provided to inform a pedestrian of the approaching of a vehicle by outputting vehicle engine noise sound through a speaker. CONSTITUTION: An electric vehicle changes a voltage, a current, or a variable resistor inside an electric vehicle PRM detecting part(101) by using an accelerating pedal. The speed of a drive motor is controlled according to the change of a voltage, a current, or a variable resistor. The electric vehicle PRM detecting part detects the RPM of the drive motor of an electric vehicle. A sound generating device(105) generates acoustic sound according to the detected PRM. An amplifier device(106) amplifies the acoustic signal of the sound generating device. |
