Device for changing the gears automatically on a synchronized gearbox

摘要

A processing device capable of starting the sequence of the speed change operations automatically in the gearbox of a vehicle, such as the automatic transmission of a truck. A first comparator compares the data received from a gearbox condition detecting device and that received from a speed ratio selection device. In the event of a difference, the comparator sends to a gearbox control device either a pulse for increasing by one speed ratio, or a pulse for decreasing by one speed ratio.