Some Peugeot-307 cars are equipped with adaptive automatic transmissions. Since the automatic transmission is a complex unit, it must be repaired exclusively at a Peugeot workshop using special equipment.
Torque from the engine to the gearbox is transmitted through a torque converter, which functions as a fluid clutch and acts as an automatic clutch, also providing torque transfer during acceleration.
The torque converter is capable of operating in two ranges, at the first stage providing an increase in torque and at the second - functioning as a simple fluid coupling without any increase in torque.
According to the principle of operation, the torque converter is similar to a hydrodynamic clutch. The car's engine drives a pump with fluid energy transfer, while the blades of a turbine connected to the gearbox's input shaft convert that energy back into torque. The reactor, located between the pump and the turbine blades, directs the liquid back to the pump inlet.
The gearbox has four forward gears and one reverse gear. The gearbox elements are held and actuated by brake bands and clutches, which are controlled by a hydraulic control unit. The hydraulic pump, installed in the gearbox, creates the necessary pressure for the operation of the brake bands and clutches.
The gearbox is controlled by a control unit that receives signals from various sensors regarding the operating conditions of the gearbox. Sensors determine the load, the position of the selector lever, the position of the program and mode switch «kick-down», as well as the frequency of rotation of the engine shaft and the driven shaft of the gearbox. The control unit processes this data in accordance with the established program and generates transmission control signals, as a result of which the optimal vehicle speeds are set in accordance with the driving style.