| 摘要 |
In one embodiment of the present invention there is described a vehicle having a propeller mechanism for propelling the vehicle in a horizontal direction. The vehicle includes a transmitter positioned on the bottom of the vehicle for transmitting a signal from the vehicle downwardly away from the vehicle. A receiver is positioned on the bottom of the vehicle for receiving the signal as it is bounced off of a surface, defined as a bounced signal. A control system is also provided that automatically sets a speed of the propeller mechanism in response to the receiver. The control system sets the speed of the propeller mechanism to a first speed when the receiver receives the bounced signal and the control system sets the speed of the propeller mechanism to a second speed when the receiver does not receive the bounced signal. The first speed is predefined as a speed that causes the vehicle to gain altitude, while the second speed is predefined as a speed that causes the vehicle to lose altitude. When the vehicle reaches a predetermined distance away from the surface of the object, the vehicle will hover at the predetermined distance as the control system toggles between the first and second speeds.
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