Can I switch to automatic transmission after failing the manual transmission test four times?
1 Answers
After failing the manual transmission test four times, you can go to the driving test center to change to automatic transmission for the last attempt. Additional information is as follows: 1. Manual transmission: Manual transmission, also known as manual gearbox (MT), requires manually shifting the gear lever to change the gear meshing device inside the transmission, thereby altering the gear ratio to achieve speed change. Working principle: The pump wheel and turbine form a working pair, similar to two fans placed opposite each other. The wind blown by one fan drives the blades of the other fan to rotate, with the wind acting as the medium for kinetic energy transfer. If liquid replaces air as the medium for kinetic energy transfer, the pump wheel drives the turbine to rotate through the liquid. By adding a guide wheel between the pump wheel and turbine, a speed difference between them can be achieved through reaction force, enabling speed and torque variation. 2. Automatic transmission principle: Since the torque converter's automatic speed and torque variation range is insufficient, several rows of planetary gears are connected in series behind the turbine to improve efficiency. The hydraulic control system automatically operates the planetary gears according to the engine's working changes, achieving automatic speed and torque variation. The auxiliary mechanism's automatic gear shifting cannot meet various driving needs, such as parking and reversing, so intervention devices like manual levers are included, marked with P (Park), R (Reverse), N (Neutral), D (Drive), and additional gear positions "2" and "1" in the drive gear for starting or climbing slopes. Since the transmission range is divided into several gear ratio segments, only within the specified segments is it continuously variable, making AT actually an automatic transmission between stepped and continuously variable types.
