Automatic Gear Shift Unit

摘要

Automatization of gear shift and number selection in passenger cars with stepped transmissionresult in improvement of driving safety due to concentration of driver's attention on the conditionsof the traffic [1, 3]. Besides, the car can be used by a disabled person. The most important benefit ofthe projected solution is associated with reduction in fuel consumption resulting from the moreeconomical selection of the transmission ratio [4, 5, 7]. The gear number choice depends on manyfactors, for example: traffic conditions, temporum vehicle and engine rotational speed as well asengine load. It is very often the case that even a driver with experience can face problems withoptimal decisions. Automatically controlled system with suitable algorithm can reduce fuelconsumption and improve the vehicle drivability. The system named MeGSS (Mechatronic GearShift System) has been developed for this purpose. It was subsequently tested in a passenger carequipped with five-step gear box. In the car the MeGSS is responsible for engine start process andthe gear shift procedure. In this system the manual (M) and automatic (A) gear ratio control ispossible. The gear shift procedure is connected with electronic throttle control algorithm, whichpromote smooth power transmission [2, 6].