digital car meter riding changing software

The cup and pointer will turn until the torque of the eddy currents on the cup are balanced by the opposing torque of the spring, and then stop. Thus an increase in the speed of the car will twist the cup and speedometer pointer against the spring. The torque on the cup increases with the speed of rotation of the magnet. The pointer shaft is held toward zero by a fine torsion spring. The effect is that the magnet exerts a torque on the cup, 'dragging' it, and thus the speedometer pointer, in the direction of its rotation with no mechanical connection between them. As the magnet rotates near the cup, the changing magnetic field produces eddy current in the cup, which themselves produce another magnetic field. A small permanent magnet affixed to the speedometer cable interacts with a small aluminum cup (called a speedcup) attached to the shaft of the pointer on the analog speedometer instrument. When the vehicle is in motion, a speedometer gear assembly turns a speedometer cable, which then turns the speedometer mechanism itself. The early Volkswagen Beetle and many motorcycles, however, use a cable driven from a front wheel. The speedometer uses a rotating flexible cable usually driven by gearing linked to the output of the vehicle's transmission. German inventor Otto Schultze patented his version (which, like Belušić's, ran on eddy currents) on 7 October 1902. His invention had a pointer and a magnet, using electricity to work. He presented his invention at the 1889 Exposition Universelle in Paris. The speedometer was originally patented by Josip Belušić (Giuseppe Bellussich) in 1888.

Digital car meter riding changing software