Some electric vehicle controllers have an anti-runaway control tube inside, that is, when the negative wire of the handlebar is broken or the positive wire is short-circuited with the signal wire, it can prevent clicking rotation, so that the automatic driving of the electric vehicle will not be beyond the driver's control.

This is controlled by the chip inside the controller of the electric vehicle. This chip will only make the click work when it receives the Hall signal within a fixed time interval. If the signal is greater than or less than the safe value, it will not make the click rotate. The way of short-circuiting the positive wire and the signal wire exceeds the specified safety value, so the clicking sound will not rotate.

The handlebar of extended data electric vehicle transmits Hall signal to the controller by sensing the magnetic force of the internal magnet. The Hall sensor is a linear Hall, which converts the rotation angle into a magnetic signal, and the controller controls the rotation speed of the wheel motor according to the magnetic force.

When carriers in solid materials move in an external magnetic field, the trajectory will shift due to the Lorentz force, and charges will accumulate on both sides of the material, forming an electric field perpendicular to the current direction. Finally, the Lorentz force on the carrier will balance with the repulsive force of the electric field, thus establishing a stable potential difference on both sides, that is, Hall electricity. The ratio of the orthogonal electric field to the product of the current intensity and the magnetic field intensity is the Hall coefficient.