A gyro powered toy vehicle is defined as any mobile device that is controlled by a means that does not restrict its motion with an origin external to the device.

United States Patent 4767053

Abstract:A toy stunt set which can be used to form a loop and ramps for use during play with toy vehicles. Two tower members with engaging grooves are mounted on top of a base. A frame with flexible sheet pieces is positioned between the tower members.

A rod at the end of a flexible member can be inserted into the grooves in order to form a loop and ramps.

Toy vehicles may be rolled onto the loop and ramps and through the frame and flexible pieces.

The flexible member can be used by itself to form individual ramps. A tumble member may be connected near the end of the flexible member so that the toy vehicles will flip after rolling onto the loop or ramps.

This is often a radio control device, cable between control and vehicle, or an infrared controller.

A gyro powered control vehicle differs from a robot in that the GPC is always controlled by a human and takes no positive action autonomously.