Nissan Sunny FB15 (Automatic transmission)
Internal structure
* Torque Converter: The fluid circuit that transfers torque from the engine to the transmission.
* Planetary Gearbox: A mechanism with multiple gears providing different gear ratios.
* Friction Discs: Clutch discs that connect or separate the various elements of a planetary gearbox.
* Hydraulic control unit: Controls the supply of hydraulic fluid to the friction discs.
* Torque Converter Lockup Clutch: Locks the torque converter from a certain speed, increasing efficiency.
Gear ratios
* 1st gear: 2,794
* 2nd gear: 1.554
* 3rd gear: 1,000
* 4th gear: 0.689
* 5th gear: 0.588
* Reverse: 2.095
Operating modes
* Drive (D): Automatically changes gears depending on load and engine speed.
*Sport (S): Shifts gears at higher engine speeds, providing faster response.
* Eco (E): Shifts gears at lower engine speeds, improving fuel economy.
* Snow (S): Starts in 2nd gear for improved traction on slippery surfaces.
Control system
* Gear selector lever: Selecting the automatic transmission operating mode
* Sensors: Monitor engine speed, transmission fluid temperature, vehicle speed and other parameters.
* Electronic control unit (ECU): Processes data from sensors and controls the operation of the automatic transmission through a hydraulic control unit.
Service
* Regular replacement of transmission fluid and filter.
* Checking and adjusting the transmission fluid level.
* Periodic maintenance to identify and correct any potential problems.